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FIRST ISSUE OF OUR NEW MAGAZINE FOR SMALL SYSTEMS! THE

.

PROJECTS.

. . .

MICROPROCESSORS .

. .

.

AUDIO ..

i

TRANSCENDENT 2000 SINGLE BOARD SYNTHESIZER

:

LIVE PERFORMANCE SYNTHESIZER DESIGNED BY CONSULTANT TIM ORR (FORMERLY SYNTHE SIZER DES _hE. =_s =VIM'S _NwwNo a,NMC CONSTRUCTIONAL ARTICLE IN ELECTRONICS TODAY INTERNATIONAL. f.EATVJRED AS A RAN SCF NDENT 2000 is a 3 octave instrument transposable 2 octaves up n-rren.= modulation a VCF with both low and high pass outputs and a separate dynamicor down gwnig an el lecdve 7 octave u=r,swws r rms. swim use o=" sweep control, a noise generator an d an ADS= e- .e detector ADSR repeat, sample and hold and special circuitry with precision Mg. a -aMotr components to ensure tuning stability amongst r_ -_ : The ket includes fully finished metalwork soled teak cabinet filter sweep pedal, professional qualify components (all resistors e -^ ! _ana aye right down to the last nut and bolt and last piece of wue1 Th ere complete ere t is even a 13A plug in the kit you need buy absolutely no wee Virtually all the components are on the one professional Quality libre g lass PCB se-rres,riums ares 7sr'aase printed with component locations. All the controls mnur.t _--eis > r.e board are made with connector plugs and construction ,s so simple it can be mew mews 'no built easily in a few evenings by almost anyone capab le of rear sores -nee elem. Seewrt ere «el synthesizer comparable in performance and Quality with ready Polt un its selling for a between £500 and £700!

alst1k141''j'iati_:arr8i!'.

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STILL ONLY

£.172.00 + VAT

FOR COMPLETE KITS! Comprehensive handbook supplied with all complete kits! This fully describes instruction and tells you how to set up your synthesizer with nothing mom akaborate then a multi -meter and a pair of ears.

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E172 00

-

200+ 200 watt AMPLifIER

-

As featured in Electronics Today International

400W rms continuous 800W peak! 0.03% THD at FULL power! PLUS all the following features too! *

* *

PSI 4001 SLAVE MODEL

Each channel totally

independent with its own stabilised power supply driven by custom designed TOROIDAL transformers' Inherent reliability monster heat sinks for cool running at the hottest venues- electronic open and short circuit protection'

-

*

Ultra low feedback (an incredible low 14dB overalls), super high slewing rate (20V/p s), 200W rms continuous to 4 ohm from EACH channel, input sensitivity 0.775V (OdB). Professional quality components, sturdy 19 rack mounting chassis complete with sleeve and feet for free standing work too.

*

Easy to build

*

-

plenty of working space with ready access to all components, minimal wiring, extensive instruction suitable for both experience constructors and newcomers to electronics.

Value for money £6001

- quality and performance comparable with ready-built amplifiers costing over

PSI 4002 STUDIO IWIODEL

PSI 4001

SUPER NEW LOW PRICES!

COMPLETE KIT ONLY £187.50 + VAT PSI 4002

COMPLETE KIT ONLY £196.90 + VAT

The kits shown on this page are available as seca-n'a =_

PR ICE STAR (CITY: Order with confidence irrespective of any price changer we will honour all prices in this advertisement until November 30th 1978 f EOct oller 1978 issue is mentioned with your order Errors and VAT rate cha -_e= exc lud ad EXPORT ORDERS: No VAT Postage charged at actual cost plus 50c "a and documentation. U.K. ORDERS. Subject to 12% surcharge lo r VAT" p e add '3 tc-e charge is made for carriage. - or at current rat e [f changed SECURICOR DELIVERY: For this optional service tU K F2.50 !VAT inclusive) per kit SALES COUNTER: ll you prefer to col'ect COL, Y'. -3 Sales Counter (at rear of lacmryl Open 9 e m 4 3C _ '. =a

`'--

- '-

'-

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-

OUR CATALOG LtE

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CD

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COMPLETE KITS: Our complete kits really are complete. All of the projects shown on this page are supplied with fully finished metalwork ready assembled high quality teak veneer cabinet, cables, nuts, bolts, etc., and full instructions in fact everything,

-

All of the kits shown on this page are available as separate packs (except the Powertran SFMT Tuner) for those customers who wish to spread their purchase or perhaps make their cabinets or metalwork. Prices are given in our FREE CATALOGUE own

ohm E STABILITY : Order with confide nce!

irrespective of any price changes.

We w ill honour all p rices in this adverbs Brent until November 30th, 1978. If ETI 0 sober 1978 issue is mentioned with your order. Errors and VAT rate chang es excluded EXPORT ORDERS: No VAT Postage charged at actual cost plus 50p handling and documentation. U.K. OR DERB, Subject to 12% surcharge for VAT' (i.e. add '/e to the price). No charge is made for carnage or at current rate if changed. SECURI COR DELIVERY. For this optional s ervice (U.K. mainland only) add £2.50 (V AT inclusive) per kit SALES COUNTER: If you prefer to collect your kit from the factory, call at Sales Counter (at rear of factory). Open 9 a.m -4 30 p m Monday -Thursday

6

OUR CATALOGUE IS

FREE! WRITE OR

PHONE

NOW!

POWERTRAN ELECTRONICS

PORTWAY INDUSTRIAL ESTATE ANDOVER HANTS SP1 0 3NM

ELECTRONICS TODAY INTERNATIONAL

ANDOVER

(0264) 64455

- NOVEMBER 1978

news digest dmm(digital midget meter?)

on the face of it It had to come. Someone somewhere had to go produce an ANALOGUE digital watch. And here we have it. Must confess it looks very nice too. Texas get the credit/blame or whatever. The display is be autiful. 120 se gments are used to produce the illusi on of the dial. On normal LCD's up to half the area is us ed for contacts to the segments, wh ich

would mean that with 121 contacts to provide the display would have to be pretty big - a clock yes, but no watch. Texas have gotten this by mult iplexing the drive to the segments, which a (lows 90% of the area to be freed for usage. and this is unusual. 1:'2L is not The chip is I L normally employed in LCD units because of the problem of driving the highly c apacitive elements. Bipolar drivers are used to avoid this, and are designed to drive the large capacitance with a (relatively) large 150µA initial current for about 100 AS and to provide the 100 nA `sustan'

-

-

Guinness take note the world's smallest DMM it seems. Made by Heuer Time Ltd it measures just 4 x 1.6" x 0.5 (100 x 40 x 20mm to you Euro-people) with a probe which is 4" x 0.8" x 0.5" (you mm lot can work that out yourselves). Volts Ohms and Amps either DC or AC can be accommodated between 2V-1 kV, 2 mA -2 A and 2k -20M although not necessarily in that order. AC measurement is true RMS. Display is 31/2 digit LCD. Input 7 10M+Price around £240. Address: Heuer Ltd, Argyle House, 29/31 Euston Road, London. '

the dalek connection

current thereafter. Another interesting point is that the material used for the display, a low voltage ester material would not usually be employed in watches because of its negative higher the temp. the lower the drive temp. Coeff. required which can lead to 'ghosting' and confusion of the display. The 1-L however can compensate for this. Naturally, since this is the first of its kind, the price of but the watch all this invention will be high initially will function as a chronograph too and the Jones's will NEVER be able to keep up with this. In the shops soon we hear.

- -

-

watt batteries Here is an amp to really

annoy the neighbours with. If they complain

about the hi-fi again, pack up the battery cassette recorder, speakers and this PAC 250 MB, drive around the back of the house and when they're least expecting it give 'em 250W a channel straight in the back door. An outflanking move to warm Napoleon's heart. The PAC 250 you see will run quite happily from 24V DC or 250V AC. Very handy for PA as well as neighbour baiting. Details from: Millbank Electronics Ltd, Uckfield, Sussex TB22 1PS.

This lot looks like it could give Dr Who a few sleepless nights does it not? It's easy to imagine it lumbering across a smoke -circled hill and intoning "Take me to

your leader... Perhaps fortunately for the human race it is simply a noteworthy new conn ection system from Pressac Ltd. The PCB mounting plu gs and sockets can be got at from either direction, and cable and chassis mounting assemblies are also available. Spacing can be either 2.5mm or 5.0mm and up to 40 ways are possible. Pressac Ltd, Acton Grove, Long Easton, Nottingham

Sound of safety?

NG10 1FW.

car alarm which operates on the ultrasonic area protection principle usually employed in houses is now being imported from the land of pasta and pinched bottoms. Called the 'Break' it uses four sensors to cover the interior of any vehicle, and has adjustable sensitivity so that spurious triggering can be avoided. Once activated so don't you have 40 secs to clear out before it goes off and coming back in 10 secs to get stuck in the seat belt swtich it off. Once the alarm is in mid sing -song, the removal of the felon will lead to a shutdown 15 secs later. If he persists not including ear so will the alarm. Price around £50 A

eye of the tornado? Britain and NATO's new aircraft the MRCA Tornado is with a Visual in its inceptor role to be fitted Augmentation System develo ped by Marconi. The systern presents the crew with a television picture of what lies ahead of their machine using a newly -developed low -light TV camera system. Based on an existing Marconi design for a low light camera, the equipment produces an image at ranges far in excess of what the unaided eye can manage, and in light conditions anywhere from daylight to starlight. Every little helps.

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.

.

.

ELECTRONICS TODAY INTERNATIONAL

-

NOVEMBER 1978

-

-

-

-

plugs from: Sofare Ltd, Stoke Heath, Market Drayton, Shropshire. 7

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-

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'11:1171 ILI

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5 fISTORS

i- : HERTS, ENGLAND

111111r

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33 CARDIFF ROAD. WATFORD,

MAIL ORDER

P

73*

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CALLERS WELCOME. Tel. Watford 40588/9.

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1'11003.

Minimum order r LZ please

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*

11L209 Rxd TIL211

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ELECTRONICS

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48

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2N2217* 2N2218A* 2N2219A* 2N2220A* 50 2N2221A* 50 2N2222A* 50 2N2303* 47 2N2368* 47 2N2369A* 18 2N2483* 22 2N2484* 11 2N2646* 36

45

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79* éFi 80* 81* 8F1 82* BFI 83* 0noq £10 00 Microprocessors u , Mini,.. £8.40 £5 90 introduction to Microprocessors Modern Guide to Digital Logic (Processors, Memories and Interfaces)

Y

Introduction to Digital Filtering e.,gner E9 40 Transistor Circuit Design rrx., notmoen,.£9 35 Essential Formulae for Electrical and Electronic Engineers Modern Electronic Maths amrn,rd £6 70 Semiconductor Circuit Elements u ionM. Includes Graphic equaliser. 50-]00 W amp. modules, active crossover. flash trigger, "star and dot" game, burglar alarm pink noise generator, sweep oscillator, marker generator, audio-visual metronime, LED dice, skeet game, lie detector. disco light show.... 5 ye

SAL TIMER PL ,l FLA°' tees AUDI63 LIMITER FIVE WATT STEIN.. RADIO BREAK DOW VOLT MT' DIGITAL TEMPERA/URI MIXER

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book

atner an unu.ual reprint From the pages of couple of years ago in the thought of by the University have re -published the series

ETE The senes a magazine. and wa of New England

25-27 Oxford Street London W T R T R F Please mark the back of your cheque or PO with yreur name and address.

Please supply me with the lowing ETI Specials:

fol-

FROM INE MUUMUU O! ELECTRONICS 101,AS INikRNATIONAI

Etl CI RCU ITS

Not

Total cheque/PO enclosed = E rnerwre Wedge wogs wow ...mme,

re.arr..a,

tiler Is.s a cwerM /era«

/ceri..

£1.50 Each volume contains over 150 circuits mainly drawn from the best of our Tech -Tips The circuits are indexed for rapid selection and an additional section is included which gives transistor specs and plenty of other useful

data.

Sales of this publication have been phenomenal

surprising when the circuits cost under volume costs

£1.50

+ 25p

1p

P&P

- hardly

each! Each

1

.

Address: M

Our success) ul beginners series came to an end some time ago now and the whole series is available from us In reprint form The three books between them contain all the information presented in the series (sometimes in more detail') and together form an excellent starting point for anyone interested in learning the art of electronics. Each volume costs

£1.20 + 25p P&P ELECTRONICS TODAY INTERNATIONAL

-

NOVEMBER 1978

November 78

THE NEW MAGAZINE FOR SMALL SYSTEMS WITH BIG IDEAS

Presented as a supplement

to ETI.

Hop on a Nasbus to 32K of memory now -

The Nascom is designed with expansion in 1 mind, This is made possible by using the best products available. The Z80 microprocessor incorporated in the basic system is so powerful it can support 64K bytes of memory and 256 ports. To utilize this capability, we have designed the buffered 77 way Nasbus.

-

With this arrangement, the way is clear for considerable expansion, starting with our new memory expansion board. It has 16 memory sockets and two EPROM sockets. Therefore, you can fill it with 4K dynamic RAM up to a maximum 8K or with 16K dynamic RAM up to a maximum of 32K. A 2K Tiny BASIC in EPROM has been developed for the board. To go with the board, we have produced a very flexible 1.0 board with three PIOs each giving two, 8bit ports, plus a UART for serial

-

will allow for a Nascom to link through a buffer board to a 77 -way Motherboard. There is then the option of eight or more expansion boards. To power this capability there is a new 8.5 amp power supply especially designed for the frame. No other system offers so much at such a low cost. And it all starts with the basic Nascom

kit which for just £197.50 offers an intelligently usable system with video and cassette interface, a full alpha -numeric keyboard and a mighty CPU chip. So if you want the best make it a Nascom system.

UK National Distributors Camera Centre, Barrow-in-Furness, Cumbri a Crystal Electronics, Torquay, Devon Electrovalue, Egham & Manchester Eley Electronics, Glenfield, Leicester Henry's Radio, London W2

Lock Distribution, Oldham, Lancs Lynx Electronics, Chesham, Bucks

Microdigital, Liverpool L2 Teleplay, New Barnet, Herts

-

1

-

Nascom-1 Kit still only £197.50 +VAT

interface. As you start building up your Nascom system you will need a convenient means of storing boards. Our new, custom -designed, Vero frame

1

®

. rrsrr.0..MwW r:..;.` rrsrwrosssrw itrsasrrssesr

Stop press... Microcomputer Seminar Nascom Microcomputer's highly successful seminar is coming to Bristol. The programme will be similar to London and Manchester, both of which were sold out. The day includes five lectures, demonstrations and an open forum. Venue is the Dragonara Hotel, Bristol, Saturday, October 14th, 09.50 to 17.30

Admission: £4.50 (inc. VAT). Lunch will be available at £4.00 (inc. VAT) per head if there is sufficient demand.

Please send me

tickets to your seminar at £4.50 each and further details on Nascom-1 expansion products/Nascom-1 Kit/Int. Nascom Microcomputer Club.* *delete as applicable

n on

Nascom Microcomputers 92 Broad Street, Chesham, Bucks. Tel: (02405) 75151

2

Name

Address

Tel. No

Cut out coupon and post to Nascom Microcomputers. Cheques and PO's should be made payable to Nascom Microcomputers.

COMPUTING TODAY

- NOVEMBER 1978

computing today NO

november 1978

1

NASCOM REVIEW BASIC EXPLAINED CUTS CARD TRITON IMPRESSIONS EAST COAST REPORT TRITON BASIC MICROFILE 1

5 9

15 19 21

23 30

Nice one NASCOM Say no more CUTS above the rest Colling all TRITON users Important show for US Try it on Triton Gary Evans in training

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--

£270 0,0 £296 00

time 8K £113.25 Memory 375nS access time 16K

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-

hopefully, for the readers. Computing Today, although presented free with ETI, is just such a new magazine, which will have a style and identity of its own.

Computing Today will cover the fields of computing, from the home, education, and small business viewpoints. Computing to us will mean everything from the complete small business system, floppies and all, to a single bit micro in a control application. The growth of small systems over the past few :.ears has been astounding the reasons for this zrowth are many and varied we won't go into them here and it is our hope that the next few years will see this expansion maintained. One of the reasons for launching Computing Today was the fact that it was no longer possible to devote enough space within ETI to cover this important area :f small systems without sacrificing other features of ETI that are equally important to many of our readers. ETI plus CT will allow us to keep everybody

-

Although this first issue of CT is only 32 pages, if growth we mentioned is maintained, rest assured at CT will grow to keep pace. This first issue of CT is published to coincide with e launch of the TRITON, an exciting new system for ..e hobbyist/education areas. CT has similar, equally x::ting projects in the pipeline and if you don't want --miss out on important news and developments in _reputing be sure to read us every month.

- NOVEMBER 1978

£19 95

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-----

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The first issue of any magazine is an exciting time certainly for the people working on the project and,

COMPUTING TODAY

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VERSAFLOPPY DISK CONTROLLER (up to4 drives 5'/e orb

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Components 2708 1024x8 EPROM £6 99 2716 2048x8 EPROM £29 90 (intel)

2516 2048

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£29 90 lequivalent of above) T 1702 256x8 EPROM

2107B-4 4096x1 DRAM £3 50

£26 00 8 for Note New Low Prices 16K Memory £9 99 4115 5kM DRAM 4116 16kx1 DRAM £14 99 £108 00 8 for £5 90 6821P PIA £4 50 AY 51013 UART £6 50 AY51014 UART(5V) £9 99 AY53600 ENCODER E8 99 8080A CPU Prices EXCLUDE VAT @

8

Trade discounts on Quantity Please add £1 00 P&P for S100 items then add VAT @ 8% 24 -hr Ansaphone order service

with ACCESS or BARCLAYCARD

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For components please add 40p P&P, then add VAT @ 8%.

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NO]ll_ltllq NMI

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0GIC EOq

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SEEP

VIDEO

(HIGH ORDER,

+J M greater than < less than

LET is used to set a variable to the result of an expression. 10 LET A =10 The variable A is set to 10 20 LET B = (A-1) *2 The variable B is set to the result of the expression (A-1)*2 i.e. 18

= equal to

=not equal to > = greater than or equal to < = less than or equal to

The compare operators are usually used with the IF mmand but can also be used in expressions. The 7esult of any comparison is 1 if true and 0 if not true false). _

Expressions

Expressions are formed from number, variables and -r_ctions. A is set to 10 G 10 LET A=10 B is set to contents of A ie 10 20 LET B = A _arithmetic operators are used in expressions and e evaluated from left to right, except that * and / always evaluated first. Spaces between numbers, variables and functions ignored. Spaces inbedded in command words are allowed. Parentheses can be used to change the order of -

a_uation.

COMPUTING TODAY

LET

- NOVEMBER 1978

30 LET

:,c`i

=B/3

(3)

The fourth element of the array is set to 6 (The first element is

@(0)) The expression need not be an arithmetic expression. 10 LET C = A * B If A equals B, C will be set to zero IfA is not equal to B, C will be set to one The LET command can be used to set several variables 10 LETA=1, B=2, C=3 each part being separated by a comma We can therefore rewrite an earlier example. ,

10

LET

A=I0,B=A,C=A+B

Rem

The REM (Remark) Command allows the programmer to comment his programme. The interpreter will ignore the rest of the line. 100 REM THIS IS THE START OF THE SUBROUTINE Y =A*A+B iH 23

Print

The PRINT command is used to print numbers, variables, expressions, and text. 10 PRINT A will print the contents of vari10 10

able A

PRINT A*2

prints twice the contents of variable A PRINT `THIS IS A TITLE' prints THIS IS A

TITLE Several variables, etc. can be printed at one e. Each item to be printed is separated by a comma. 10 PRINT A,B,C will print the contents of A followed by B and C on the same line.

Text can be used to qualify printout. 10 PRINT THE RESULT IS', A Text can be contained by either single or double quotes, this allows the other type of quote to be printed. 10 PRINT `ABC"CBA', "123'321" will print ABC"CBA123'321

Numerical values are p rinted with leading sp aces (Right Justified) in a field of width 8 characters. The field width can be altered using a e sign followe d by the new width (i.e. 3 give s a width of 3). The field width will then remain effective until another or the end of the current PRINT statement. $$

10

PRINT A, #3, B,

will print A in a

1, C

width of 8 characters. B in a

width of 3 and C in a width of 1. $1 will result in C being printed Left Justified and any following printout will be shifted to the right if C

ANNOUNCING THE

is greater than 9

The field width can also be an expression PRINT I, A will print A in a field width equal to the contents of variable I The maximum field width is 63. Note that negative numbers require an extra cha ratter in the fiel d width for the minus sign. Extra space s can be generated by repeated commas. PRINT 3,A,,,B will print a 3 character A, 2 spaces and a 3 character B Several PRINT statements can be made to print on the same line by ending the statement with a comma. Graphic characters can be printed using the PRINT statement. The description of the graphics font lists those Graphics which can be contained in quotes and will result in graphics being printed. The PRINT statement can also be used to issue cursor control characters 10 PRINT j -H will issue a control H which will backspace the cursor 10 PRINT tI will issue a control I which will forward space the cursor 10 PRINT tJ moves cursor down 10 PRINT tK moves cursor up 10 PRINT -j-L will clear the whole screen and reset the cursor. Note that this command must be followed by a delay befo re the next command (FÓRI=1 TO 250; NEXT I) 10 PRINT tM will reset t he cursor to the start $$

+

of the line.

Input

The input command is used to read an expression

OEM O

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PART OF THE MICRO REVOLUTION Prices exclusive of VAT and carriage COMPUTING TODAY

- NOVEMBER 1978

BASIC

from the Keyboard. Normally the keyboard input is just an integer value between -32767 and 32767. 10

10

INPUT A

INPUT A,B

an expression such as A + B, the expression will then be evaluated by the interpreter and the result 5 stored in the variable C. The machine will then print 5. It is also possible to enter single characters as a reply by making use of the expression input. 10 LET Y=O,N=1 20 INPUT 'DO YOU WANT TO CONTINUE? Y OR

When this statement is executed, the BASIC will first print A tollowed by a space and then wait for keyboard input. The input is terminated by carriage return. The input is then stored in variable A will print A,space,then wait for

input, it will then print

N' A 30 IF A =1 STOP

B,

If the user replies Y, A will be set to the contents of the user replies N -A will be set to 1 and the programme will STOP.

space, and wait for input again. Inste ad of just allo wing the machine to prompt you with th e variable, it is much better to ask a specific questio n. This is done by enclosing the text of the question in quotes. 10 INPUT 'HOW MANY EGGS HAVE YOU LEFT?'

Y i.e. zero. If If

The IF command is used to compare expressions, using the compare operators. If the result of this comparison is true (non zero) the rest of the state ment is execut ed. If the result of the comparison is false (zero), the rest of the statement is skipped and execution resumes on the next statem ent. 10 IF A = O PRINT 'A IS ZERO' The machine will print A IS ZERO only when A is zero. Note that un like other BASIC interpreters and compilers, the w 'ord THEN is not used. Either side of the compare can be an expression. 10 IF A=B*2 P RINT 'A IS TWICE B' 20 IF A*3=B* 2 PRINT `A=B*2/3' A compare op erator need not be used in the IF statement but th is practice should be avoided where possible as it can make the programme very hard to follow. 10 IF A- 1 PRINT 'A IS NOT ONE'

I

The machine will print HOW MANY EGGS HAVE YOU LEFT? and then wait of a number to be typed in. If during RUN time, the typed input is not a valid expression, the prompt will be repeated and then the machine will wait again. It is also possible to reprint only pa rt of the prompt. 10 INPUT 'WHAT IS ', `A + B?'C, A-B?'D The first time the printout will be WHAT IS A+B? and after an invalid input it will just print A +B? The BASIC interpreter uses its e xpression evaluation routine to decode the input a nd therefore the

programmer or user can enter an expression using variables already set up. 10 LET A=3, B=2 20 INPUT C 30 PRINT C

Instead of entering a value for C, the user can enter

A more intere ing way to learn what is a microprocessor? If you are considering buying a Microcomputer, Development System, or just want to learn more about this exciting technology, then this short introduction to Microprocessors is for you Comprising of a 72 -page book keyed to over two hours of cassette tapes the many aspects of Microprocessors are explained, including Binary and Hexadecimal counting.

Internal structure Operation Programming Techniques Devising a program etc Learn at your own pace with this valuable addition to your reference library ,

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COMPUTING TODAY

- NOVEMBER 1978

-- - --

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25

the PRINT command is only skipped when the result of the expression in the IF command is zero. Several commands can follow the IF command 10 IF A = 0 PRINT 'A IS ZERO'; GOTO 50 When A is zero, the machine will print AIS ZERO and then jump statement 50. GOTO

You will probably be fairly familiar with the GOTO command already as it has appeared in several of the examples for the other commands. The GOTO command is u sed to b reak the sequential processing of the BASIC interpre ter and cause the interpreter to jump either f orward or backwards to the specified statement num ber. 50 GOTO 10 When the interpreter executes this statement i t will jump back up the program to statement 10 and continue its processing from statement 10. Again, the statement number following the G OTO can be an expression. 20 GOTO A*2 Will jump to the statement number calculated from the expression Ax2. If the expression gives a non existent statement number the BASIC will give an error report. Using a simple expression for a GOTO is useful where different routines may be required as a result of an input. Another method of using a computed GOTO is to use the array variable and index it. 10 LET :@(1) = 100, @(2) = 200, @(3) = 100,

(4)=25

For and next commands

The FOR c ommand is a very powerful c ommand. It is used to make the BASIC interpreter loop `FOR' a specified n umber of times, the end of t he loop being defined by the NEXT command. 10 FOR I = 2 TO 10 STEP 2 20 PRINT I 30 NEXT I I is set to 2 when the FOR statement is first encountered. It will then remain at 2 until the NEXT command is encountered. On reaching the NEXT command 2 is added to I and the BASIC returns to the command following the FOR command. This is repeated until I becomes greater than 10 where upon execution conti nues with the command following the NEXT command. Hence, the machine will print 2

4 6 8 10

On exit from the loop I remains at its next value ie 12. If statement 10 had been 10 FOR I = 2 TO 11 STEP 2 I will be left at it s first value greater than 11 ie 12. Negative inde xing is allowed as long as the first value is greater than or equal to the second and the

step is negative. 10 FOR I =10 TO 1 STEP 50 NEXT I

20 INPUT I 30 GOTO @(I)

I

If the input for I is 1 the interpreter will jump to statement 100 for I = 2 it will jump to 200

for I = 3 to 100 again for I = 4 to 25 It is advisable when using the computed GOTO to check the variable for valid values, ie in the above example it would be advisable to insert 25 IF I 4 GOTO 20 This will only allow an input of 1 to 4, any other input will result in a repeat request for input. Gosub and return

The GOSUB command although similar to the GOTO command, is used to exi t from a statement and jump to a routine starting at the specified statement number. Execution co ntinues from the specified statement number until a RETURN command where upon the BASIC returns to the command following the original GOSUB. 10 PRINT 'LETS EXECUTE ROUTINE 100' 20 GOSUB 100; PRINT 'WE HAVE NOW RETURNED' 30 STOP 100 PRINT `THIS IS

ROUTINE 100' WILL RETURN WHEN I HAVE

120 PRINT `I FINISHED' 130 RETURN This will result in the following printout LETS EXECUTE ROUTINE 100 THIS IS ROUTINE 100 I WILL RETURN WHEN I HAVE FINISHED WE HAVE NOW RETURNED The GOSUB 100 command causes the BASIC to jump to statement 100 but also to remember where it is in statement 20. It now executes from statement 100 until it reaches the RETURN command. It then 26

returns to statement 20 and continues processing it.

-1

will start at 10 and step down to

1.

1

in increments of

If STEP is omitted, a step of 1 is assumed. 10 FOR I=1 TO 100 I will start at 1 and step up to 100 in increments of 1. Once more, expressions can be used in all three positions instead of numbers. The expressions are evaluated when the FOR command is executed and any following chang es to the variables used will not effect the loop. 10 LET I = 10 20 FOR I=I TO I+5 50 NEXT I The initial value of I is evaluated as 10, the final value is 15. Within the loop, I will index from 10 to 15 in steps of 1 FOR and NEXT commands can be `nested' within each other, the limit being that of the size of the stack. 10 FOR I =1 TO 10 20 FOR J =1 TO 5 30 PRINT I*J 40 NEXT J 50 NEXT I This will result in the machine printing I*J when

I=1 and J= 12345 then

for I = 2 and J = 1 to etc. etc.

5

until I =10 When a NEXT command is executed, the BASIC interpreter checks that the variable specified is the same as that used by the most recent FOR. If they are not the same, the FOR is terminated and the previous FOR examined. This continues until a match is found. FOR I=1TO10 FOR J =1 TO 10 IF J = 5 GOTO 50 NEXZ J NEXT I Each time J gets to 5, the BASIC jumps to statement 10

20 30 40 50

COMPUTING TODAY

- NOVEMBER 1978

i

This cancels the J FOR loop leaving J at 5 and continues with the I for loop. If within a FOR loop, another FOR loop using the same variable is encountered, the first FOR loop is terminated. 50.

Stop

The stop commands stops the execution of the programme when it is executed. Any number of STOP commands can be included within a programme. 10 GOSUB 100 20 GOSUB 200 30 GOSUB 300 40 STOP

BASIC not really worth the trouble it can cause. Before using memory mapping it is advisable to use either command 12 or 28 to reset the cursor. If the screen has been scrolling, row 1 will not be at the top of the scan unless this is done. The graphic symbol specified in the second parameter is a decimal number between 0 and 255 inclusive. If a larger number is specified, only the least significant byte is used. The graphics and character code are given elsewhere in ETI but some of the more useful are listed below.

VDU

The VDU command allows the programmer direct access to the VDU control chip and its memory hence allowing a wide range of graphics applications. The VDU command has two parameters, the first being the VDU memory address, the second being the desired graphic symbol specified as a decimal number. 10 VDU 5, 126 being placed in This will result.in the graphic the fifth byte of the VDU memory. The VDU memory is arranged as 16 rows each containing 64 bytes therefore addresses 1 to 64 are on the first row, 65 to 128 on the second etc. Due to the function of the VDU control chip, care should be taken when using the first row and the first column as certain graphics characters will produce strange effects.

->

To allow the programmer to use all the VDU

control commands, address zero has been allocated.

10 VDU 0, 12 This does not use memory location zero, instead :he value 12 is output to the VDU controller. 12 is the command to clear the screen and reset the cursor. Note that commands 12 and 28 require an extra delay while the command is executed. A FOR loop should be used (FOR I =1 TO 150; NEXT I before the next PRINT, VDU or INPUT command.

8 9

10 11

12 13

97 25 29

Other useful VDU commands are as follows: Backspace cursor one character Forward space cursor one character Line Feed (Move cursor down on line) Move cursor up one line Reset cursor to top and clear screen Reset cursor to start of line Carriage Return clearing rest of line Line Feed Reset cursor to top without screen clear Reset cursor to start of line without rest of line

-

clear.

Is

\Vhen using the memory mapping option, care be taken to make sure that the memory address between 1 and 1024 inclusive. If you exceed 1024 it possible to overwrite the stack and your pro It is possible to make your BASIC programme odify itself using VDU but this is fairly difficult and

COMPUTING TODAY

- NOVEMBER 1978

see Graphic Font

to 31 Space

o

32 33 48 58 65 91

96 128

----

47 57 64 90 95 127 225

0

to

9

:; < = >? A to Z [

see Graphics Font Is a repeat of 0 to 127 (The high

order bit is ignored)

To print a variable between 0 and 9 using VDU

just add 48.

VDU 0, I + 48 This will print the value of I if it lies between 0 and

9.

To produce moving graphics, it is necessary to use FOR loops to index the memory mapping. Direct commands

The following are direct commands to the BASIC Interpreter. They are obeyed as soon as they are entered. RUN will start the execution of the programme at the lowest statement number. LIST will print out all statement in ascending numerical order. LIST 100 will print out all the statements starting at

statement

LIST 50,

100. 10

will print 10 lines starting at statement

10.

NEW will delete all programme statements ready for a new programme. Control C will return you (at any time) to the Monitor. Any BASIC command can be entered as a Direct Command by leaving off the statement number. The

statement is then executed immediately and not stored as part of the programme. This feature is very useful when your programme stops due to an error report. (see Error Reports) Abbreviations

the commands can be abbreviated as follows. It is advisable only to abbreviate when you are tight on memory as the abbreviated programme can be extremely difficult to follow. All

Functions A. R. S.

= ABS = RND

= SIZE

Commands = LET ie A = B + C, D = E + F etc Implied 27

1

I

BASIC=.

REM.

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It is quite probable that you can have already seen some of the error reports generâted by the BASIC

Interpreter. Although there are only three different error messages (WHAT? HOW? and SORRY) the BASIC will insert a question mark at the point where the error occurred. WHAT? This means the interpreter has come across a command or expression that it can't interpret. WHAT? 300 I? PUT A INPUT is spelt wrongly. WHAT? 40 A = 300/(B + C? The close parenthe sis is missing Thi s means the i nterpreter can not execute

-

HOW?

-

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than 32767

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* * * *

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SORRY If this occurred during typing in of the programme then there is not enough memory. If this occurred during execution (RUN) th en either there is not enough memory for or the express ion I*J+K may be incorre et. To check this type PRINT I,J,K,I*J+K and the values of I J K and I*J+K will be printed. You can now check if the result is

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28

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-

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FE ATURES

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78 ELECTRONICS TODAY INTERNATIONAL

-

NOVEMBER 197E

FEATURE

INSIDE

ULTRASONICS Ultrasonic sound at very high frequencies is being used increasingly for medical diagnosis. Dr P. N. T. Wells of Bristol General Hospital reports.

THE IMPORTANCE OF ultrasonic diagnostic methods -.es in the fundamental differences between them and other techniques such as radiology and radioisotope

scanning. The symptoms of some diseases, and of natural conditions such as pregnancy, are best invest,gated by ultrasound, It maps out anatomical cross sections, measures the performance of the heart and the ow of blood, and identifies many kinds of abnormality, -eluding several types of cancer, all without encroaching into the body in any way. Twenty-five years ago, doctors seeking to investigate -'e structures of the body had no alternative to X-rays and this often involved injections of substances to give better contrast to obtain information about soft tissues. Nowadays, ultrasonic methods have replaced radiology - helping to solve a number of clinical problems =-octors depend on ultrasonic diagnosis, and patients jemand this kind of investigation. The procedures are -apid and painless and nothing enters the body other t^an ultrasound waves. Unlike ionizing radiations, _.trasound at diagnostic exposure levels seems to be -armless.

Clock

r.. 1

Near -side Stil lftLIrSS

Transmitter

Ultrasonic probe i,

Swept gain generator

Ultrasonrc beam

Receiver

d-Ijne

Near -side

M

signals

echo

Display

Far -side echoes

Vertical deflection plate

Time -base generator

Basic Principles b"'cst diagnostic applications of ultrasound depend on -= reflection of ultrasonic waves at surfaces between -._s-ue struc tures which differ in their so-called charac-

stic imp edance. The chara cteristic impedance of a is equal to the produ ct of its density and the 'city of ultrasound within it. The densities of soft sasues, about 103 kg m -3 (kilograms per cubic metre), and the velocities of ultrasound within them, about 7 500 m s -t (metres per second). are similar to those for eater When an ultrasonic wave strikes the boundary between tissues that differ in characteristic impedance, a proportion of the energy in the wave is in much *e same way that light is reflected reflected when it meets a Lange in reflectivity at a surface. The characteristic impedances of soft tissues are >r:lar, so the echoes from their boundaries are very For example, only about 0.5 per cent of the

aerial

rail

E_ICTRONICS TODAY INTERNATIONAL

- NOVEMBER 1978

screen

Cathode-ray tube

Horizontal deflection

E

ectron gun

plate

Fig. 1. Basic arrangement of the A -scope system, in use in this instance to show the mid -line structures of the brain in their relative position halfway between the sides of the skull, as indicated by symmetry of the deflections of the cathode-ray tube trace. Asymmetrical spacing of the deflections may mean that disease has brought about a physical change such as a tumour on one side of the brain. The swept -gain generator gradually increases the receiver amplification over each sweep of the time base to compensate for the artentuation of the deeper echoes by intervening tissues.

energy striking the boundary between kidney and fat is reflected. However, such echoes are large enough to be detected by a sensitive receiver, but almost all the energy crosses the boundary and is available for reflection by deeper structures. Much larger reflections occur at boundaries between soft tissues and either bone or gas, because of large differences in characteristic impedance. These large reflections restrict the use of ultrasound in medical diagnosis. Moreover, it is necessary to exclude air from between the probe and the patient. This may be done either by examining through a water bath or through a film of oil smeared on the patient's skin.

Ultrasonic probe

Mover pea bo

dnve

f)

`J .

lace o1ate

Ultrasonic

Heart

beam

Brightness modulated trace Ulva volet recording paper Idling roller Constant speed paper drive coller

Resolution Ultrasonic echo -ranging techniques depend on the measurement of the time interval between the transmission of a brief pulse of energy and the reception of its echo, just as in radar In any imaging system, whether using light, ultrasound or any other kind of radiation, the resolution is limited by the wavelength of the radiation. It is for this reason that ultrasound, as opposed to sound, is used in medical diagnosis. We need to visualise structures of only a few millimetres in size, so that wavelength has to be around a millimetre or less In soft tissues, it is about 5 mm at a frequency of MHz and p roportionately less at higher frequenc ie s. The highes a udible frequency, about 20 kHz, has a wavelength of 7 5 mm. In principle, the performante might appea r li kely to improve as the frequency is ncreased, bu ultrasound is attenuated as it travels through tissues and the rate of attenuation also increases with the frequency, so we have to compromise between better resolution' and reduced penetration. 1

Fig. 2. Time -position recording system based on the B -scope display, shown in use for echocardiography. The fibre -optic face

plate of the cathode-ray tube collects enough light to produce self -developing trace on ultra-violet recording paper.

a

1

Pulse -Echo Techniques ultrasonic instrument for diagnosis, a probe containing a piezoelectric transducer converts electrical signal into ultrasound waves for transmission into the patient. It does the opposite for the echoes. The simplest type of ultrasonic pulse -echo diagnostic system is called the A -scope (See Fig. 1). The clock triggers the transmitter, which feeds a brief pulse with a large amplitude to the transducer Echoes return to the probe from those reflecting surfaces inside the patient that lie along the ultrasonic beam Electrical signals from the echoes are amplified by the receiver and applied to the vertical deflection plates of the cathode-ray tube; the time -base generator, which is triggered into operation by the clock at the instant the ultrasonic pulse is transmitted by the probe, is connected to the horizontal deflection plates to drive the spot on the display at a constant speed from left to right. In this way the beam sweeping across the display is deflected vertically at intervals along the horizontal axis, corresponding in distance from the start of the sweep, to echo -producing surfaces at various distances along the ultrasonic beam A special circuit in the receiver increases the amplification of the deeper echoes to compensate for theit attentuation by intervening tissues The clock operates at a repetitin rate fast enough to give a flicker -free trace on the display. The A -scope has clinical applications in neurology, ophthalmology and internal medicine. It allows the In an

80

Fig. 3. Two-dimensional scanner and B -scope display system studying a foetus. The time -base generators are driven by electrical outputs from a series of resolvers th at measure the position of the ultrasonic beam as it moves across the patient. Horizontal and vertical time -bases combine to deflect the spot in such a way tha t its movement across the display corresponds to the movement of the beam. Echoes received as the probe moves over the patient produce a cross-sectional image in a plane corresponding to that of the scan. In this example, the image is built-up on the screen of an electronic storage tube for direct viewing.

depths of echo -producing surfaces to be measured, and the characteristics of echoes from within structures to be studied Echoes from moving structures, such as the valves of the heart, oscillate in position along the horizontal axis. or time base, of the display. In cardiology particularly patterns of movement can give diagnostic information They can be studied by making recordings with the aid of a B -scope display (see Fig. 2). In the B -scope, the time -base sweep is normally visible, but it is brightened by returning echoes to ELECTRONICS TODAY INTERNATIONAL

-

NOVEMBER

1

978

FEATURE : Ultrasonics

Head al

- twin

I

Head of

twin 2 Placenta

Abdomen

Abdomen ol twin

of twin

2

I

Fig. 4. A two-dimensional scan reveals twins at about 25 weeks of p regnancy. The placenta on the anterior wall of the uterus is dea rly defined while the abdomens of the twins, identified in the explanatory diagram, appear in section.

produce spots of light on the display in places where, on an A -scope, there would be deflections of the beam. The positions of the spots of light correspond to echo producing structures in the patient, and the pattern of their movement can be permanently recorded

Cross -Sectional Images The B -scope forms the basis of another display method, :he two-dimensional ultrasonic scanner (see Fig. 3). The .iltrasonic probe, instead of being held in the hand, is --counted on a scanner. It can be moved to any position n a two-dimensional plane In this way it is possible to arrange for the beam to pass through structures lying in a chosen plane within the patient, while the position of

_:auonary reflector

'ector moving

-:..ards source

ector moving from source

these rapid mechanical scanners produce so-called real-time images, they lack flexibility This difficulty can be overcome by using ultrasonic probes containing many separate transducer elements, operated separately or in groups, which can produce ultrasonic scans made up of parallel lines or or lines arranged in a fan shape, at frame rates of tens per second As well as making it possible to study rapidly moving structures, real-time scanners can also be used to explore large volumes of anatomy in a short time. A doctor using one can examine a patient in about a quarter of the time it takes with a 'conventional' twodimensional scanner

Doppler Effect The frequency of an ultrasonic wave reflected from a stationary structure is equal to that of the incident wave. If the beam is reflected by a surface which is moving

Wave from transmitter

Reflected wave, equal in frequency to transmitted wave

a

the probe and the direction of the beam are measured continuously by 'resolvers' mounted in the scanner The electrical signals from the resolvers control two time base generators, driving the vertical and horizontal beam deflection plates of a cathode-ray tube. The direction and position of the ultrasonic beam across the patient controls the position of the cathode-ray beam showing up on the display, related to the positions of the echo -producing surface. A cross-sectional image of the surfaces can be built up photographically by a camera with an open shutter that records the bright spots on the display while the patient is being scanned The echo information can also be stored electronically. Two-dimensional scanners in which the probe is moved in contact with the patient produce individual images in scanning times of about 10 seconds, images can be produced at a much faster rate by moving the probe mechanically. Images in rapid succession allow physiological movements to be studied; their main importance is in cardiological diagnosis. But although

Tra nsmnte

Receiver

Probe

Wave from

transmitter Reflected wave, higher in frequency than transmitted wave

Transmit; na

transducer

rT

Receiving transducer

Rate meter

Wave from transmitter

Reflected wave, lower in frequency than transmitted wave

Ultrasonic beams

occurs when wave is reflected from F. 5. The Doppler effect giving an upward or downward 'shift' in a

a moving surface, kiequency as in (b) and (c).

;CTRONICS TODAY INTERNATIONAL

- NOVEMBER 1978

Foetal heart

1

Record of foetal heart rate

I

'shift' is to monitor the foetal heart. The echoes usually fall in the range of audible frequencies. Fig. 6. One use of the Doppler

81

i

FE ATURE Ultrasonics, towards the ultrasonic source, the reflected wave is compressed into a shorter space. This means that the wavelength is reduced. It shows as an upward 'shift' in its frequency. Reflection by a surface moving away from the source gives a downward shift. This phenomenon, the well-known Doppler effect, conveniently gives shift frequencies that fall in the audible range when ultrasound is reflected by moving structures in the body such as heart valves or flowing blood. A simple instrument based on this makes it possible to detect the movement of the foetal heart. Similar instruments to measure blood flow allow peripheral arterial disease to be assessed. Because Doppler shifted signals are received only from structures that move, two-dimensional maps of them can be built up by using a Doppler probe to scan the patient. In this way the distribution vessels close to the surface can be studied. Such information may obviate the need for X-ray angiography. which is a dangerous and expensive procedure. It can also be combined with other information about structure positi on obtained by the pulse-ec ho method, making it poss ible to map out blood vessel s within the body and mea sure the rate of blood flow at the same time. The clinical value of ultrasonic techniques has already been proved, but their spread into general, everyday service will depend on the development of instruments that are simple to use. These, paradoxically. may be more complicated than the ones we already have. It will also mean training doctors and technicians to obtain and interpret results. But it is clear that ultrasonic diagnosis is, in many instances, the best and most economical way of getting the information essential to proper care of the patient.

Eli

SINCLAIR PRODUCTS'

M,croo,awn Tv 3200. PUM35 027.26, mom. adeprr 33.24, case 33.21. 30k, probe 31S.911. 0M235 47.6. Raceme:eel. batten, unes C7.N. Adapter ;charmer 02.70. Cao CS.SO. 30kv probe 316.05. amb,oge plop cabd.lor 313.15, wag ibrary

32.55. man, adaptor 33.20. Ennerpnse

aroetenn

ebee

calculate.

£2026.

BATTERY ELIMINATORS 3-wep

medre with toddled outpu, and A way 3/415,6V 100m. 32.61, 6, 7K:9v

m.11ryack

300me 32.75, 100tee hale .edele urne areas a PVp battery with prou Mud emeen. 9V 3225, 64 32.11, PAY 110+9V 34.0, 64+6V

Kill,

4.50,

4rnV+/1,24 14.60, mime.» recarder maim md. 7$5V 1000. wee 5 pen de, Mud £221.

m

S-DECS AND T-DECS' S

-Dec £3.39, T-DeC £4.44, P -DeCA £4.52, P -DeCB £6-73, 16 dit or 10T05 adaptors with sockets

cemmea. 17V dc mall. output 9V 300me 31.50, output 7%V 300e.. 41.50. guipai 2,4%! 6 1a:9í 17V 800mo 13.50.

E2.14.

CONTINENTAL SPECIALITIES PRODUCTS'

EXP300 £6.21. EXP350 £3.40. EXP600 £6.80. EXP650 £3.89. EXP40 E2.48. PB6 £9.94. PB100

£12.74. LM

1

£30.99.

LP1

£33.48.

LP 2

£19.44.

TV GAMES

sa e for free data New. reelng car tv games chip £Y.3.8603 plus economy to t £20.60, Tank battle rhp AV -3-8710 plus ec000 my kit stunt mole, cycle clop AY -38760. plus £13.95, economy kn E1 2.66, 10 imam edQle 2 che. AV -3-6600 plus econo mr kit 312.10, eV-3-8500e ip plus economy kn E8 .16, madded shoot Mil Ma All colour generator ki 47.50. Attractively 34.65. cased assembled tv games Stunt cycle £26.61. fek war game £39.95, 4 ga me models (tennl. football squash and pelota) bi Oct and whoa 311.65, Caber Send

1

U.N.

BATTERY ELIMINATOR KITS Send tee lu, hoe leaflet on range. 100swa

reds

types we press mud cannecmn 4,4V C1.10, 5V 41.60. 9V 01.80, 4%.4 450 32.60, 6.-64 32.60. 9+9V (2.50. tape 714V 100ma men dm Mug £1.00. be.ep'duty 13 wwee.e tame 4Y,. 6, 7 815, I1, 13. 1417, 21, 25/26,34. 42V Amp

cala

(1.95, 2 Amp (7.25.3 eke. .eNteed S-w tame tot lord nun 37455.6, 71e/9 n 2 15: 19V 1

100ma 03.20, 1 Amp 30.40. VrrIlSI. »Item etabMeed model. 2.18V 100e. 33.60, 2 30V IA 38.55. 2 30V 2A [16.11. Car cememare I2v dc meut output 9, 7h, 50 I A lmbiu/10 41.06.

1

E14.50.

MAINS TRANSFORMERS 605V

1(%ón. 71p. 1.5a 02.31. 6 3V 1$5 a £1.89, 943 6V 75,14711p, le 31.M, :eh 32.80. 1 2-0-12V 500. 70p, 100114 Pep. 1s C2 130 /ze 95p,

16.01SV

let

V.

32.7*, 30.030V la C3.11.

JC12,

JC20

AMPLIFIERS A

AND

JC40

range el mlegra1N circuit aud,ee mpldiers supplied with fre e deli. end pined circuit s. JC12 6 watts £1.60. JC20 10 svelte £3.61. JC40 20 watts £3.95. Send a a e for tree data on our range of matchun o now.. and plump kn.

FERRANTI ZN414 IC radio chip £1.05. £3.85, case Cl. Send

Extra parts and pch tor radio s a.e. for free data

PRINTED CIRCUIT MATERIALS

PC etcn,no .,r. economy 1.70, standard E3.82, 50 so me pct. 40p. 116 eeCl £1.05, etch resist pens economy 46p, eeo 73p. all drill bits /32 ins or Imm top mach edrung lot h 88p, lemmata cutter 750. 1

BI-PAK AUDIO MODULES Sane tae for dora 5450 rune, 323.11.

ALSO

£4.50. PA100 016.71. SPM80 34.47. BMT80 35.41 Mee° 336.74, Seise 30 320.12.

BULK BUY OFFERS Moomum 1

>acne«. 63 Any mi. from Mn aectran N41481.3p. 11440023....«212 80. 7418411 11E 556 Sail 210. 723 14.14 43p. AC 7502311

160.

Caen eouiv el 5117602311

will

,mproyed

hot rivi

74p. Mollie «Mal et popular eoMlsture 8[109 4.4p. 8CY71 4.7p, 9CV22 4.4p. Fame 20mm C Sr,. carved* 25 6 I 2. Mere eiNMew Ice 0.7p 1n1 90 9i. type 7.49.3heard.,. 516 612 '0 ohm to 1OId 'AVy 0.0p. 1W 1.1p. PSY.rr cep.Mmt. 250V 01 022 033. 047mí 2.7p, 015m1 1.Ip, 068m1 1.4p, 0 Imi 1.60. 0 22m? 3p, 0 33ml 2.5p. 0.47ml P.lymyreue cepaMr. 012 63V 15 10 8200pí 2V,p. Comet epeeera 50V E12 27pr te 1000(1 I -7p. 65 15oop1 to 33000p1 1.7p, 4200071 2p. !be. aelyae 10V. 47 251 5p. 750 5ml Sp, 1001 4p. 160 2201 59, 32, 47 IflOml Ip. 220 330ml 3p. 470mí l 1p. 1000nd 12p. Zenon 400m W 621 207 to 33V 4.1p. P,.... pee wb.mmioum 0 1W none or eon 100 to 4M 78.1p. etemPen cara %W

lip.

1

407 to 2142 lop

orli,

single 24p. duel 78p.

S WANLEY EL Swenley, Kent DUFT. CTI, 32 Ool4r1 Reed ECTRONICS

, Meer add app or the meal post M order for postage. PricesBOO 8EZ include VAT Overseas customers de dati 7% an Items marled' and I I a On others. Official credit orders

Mail order only

welcome.

THE WORLD'S MOST ADVANCED MICROPROCESSOR VIDEO GAME DIRECT FROM THE USA

THE ATARI' VIDEO COMPUTER SYSTEM

- READY BUILT CARTRIDGE SYSTEM EX -STOCK Just look at a few of the numerous games available to you in multi -colour (on colour TV's) with realistic sound effects. This Video Computer System based on Signetics 2550) is available complete with the 27 game Combat Cartridge, multifunction joysticks, mains adaptor and aerial switching unit, Fully guaranteed for 691 £149.00 12 months. (inc. VAT) At present there are 9 cartridges available a total of 192 games plus many more on the way. Price per cartridge) £13.95 _4(inc. VAT)

-

-

4rmt

Securicor delivery available Add £4.00.

-

Please make cheques and po stat orders payable Buy it with Access

Discoui

CoMhJi IIInG

82

to

DISC OUNT COMPUTING , or phone your order quoti ng BARCLAYCARD or ACCESS number,

14 STATION ROAD NEW BARNET HERTS. TEL: 01-441 2922/01-449 6596 CLOSE TO NEW BARNET BR STATION MOORGATE LINE OPEN 10 a.m. to 7 p.m. Monday to Saturday -

-

-

-

ELECTRONICS TODAY INTERNATIONAL

- NOVEMBER 1978

Mullard

EASY BUILD SPEAKER DIY KITS Specially designed by RT -VC for costconscious hi -ti enthusiasts, these kits incorporate two leak -simulate enclosures 8" lapproe) woofers, two two EMI 13" tweeters and a pair of matching crossovers Supplied complete with an easy to follow circuit diagram, and crossover components

It's the units which x 8" lappro;

Size 13-

I

AUDIO MODULES IN BARGAIN PACKS

illustrated

we supply with the enclosures wooler (EMI) 2i' app

[1 700

per

tweeter, and matching crossover components stereo pair Power handling 15 wafts rms, 30 watts peak + p & p [3 40

CURRENT CATALOGUE PRICE £

BUILT AND READY TO PLAY

AT OVER

SPEAKERS Two models Duo Ilb, teak veneer. 12 watts rms. 24 watts peak. 18}" x 13{" x ]}" lapproe Duo III. 20 watts ems. 40 watts peak, 27" x 13" x 11}Ì" eppr Duo 1i1 PAIR Duollb E11 p&pf650

PER PACK

p&p

E54:

SEE OUR PRICES

`-

PACK 2 x LP1173 10w RMS output power audio amp modules, + LPt t 82/2 Stereo pre amp for ceramic and auxiliary input. 1

1

MTK MAAEAS

EASY TO BUILD

taon o0

SJ.ak

IIIus.

2 ms aurae Munoz

ircbbnp

7

a

reread;

p&p

PCE

p+p£1RI00

+l

L 7.45

OUR PRICE

p+p

f 19.95

aplar sxk.l

SPMERICAI HIP! ap.aken

OUR

PACK 2 2 x LP1173 10w RMS output power audio amp modules LP1184/2 Stereo pre amp for magnetic, ceramic and auxiliary inputs

RECORD tu,Ile0+nm.ntnouaunna¢mtpm,iataeud.np,c. module 60m0 PLAYER wmpnlng r.edY enameled acme wno cu. d.wca pie-cut artl lumber au\elmawlel aura KIT rae.ml Were0agm a wans e.r rapxlN.

dollng

f 4.95

1

£l.00

1

p+p

Room Controls Vol On/011 Bass Treble Balance Posh Batons for Gram, Tape VHF MW LW and 5 button rosary

VOLT MAINS TRANSFORMER,

21/2

we

f

plinth with

.ID 5 lunchan men's digital watch mless steel finish aimless LCD 5

function men's digital watch

caserless steel finish

if. -0

Function CHRONOGRAPH men's digital watch, stainless steel finish 8

1110M

f1.00

J

-

Whitton Varicap tuning pots,

SON

a for

ECCA OC 1000 Stereo Cassette P

/1.50

C B

f 2.95

switch oscillator coils and

rkeads t1ECCA 20e Stereo speaker lot comprising 2 6- mums bass units +2 31" egos

f 14.95

Tunes

£12.95 /13.95

OUASTER ',Wert tnies1

s

mwsette

recorder 1epe

'%PE TRANSPORT Mechanism

-a selection

meeu horn

IMUTAL CLOCK RADIO Mains operated RADIO/CASSETTE RECORDER. MW, Imes VHF 6 watts output Battery mains operation

PO

itTADLE

la

RADIO/CASSETTE RECORDER, WW. SW, VHF mains/battery operation

í, ri 4,1

133/4" x 51/4"

20 x 20 WATT STEREO AMPLIFIER Viscount IV unit in teak finished cabinet Silver fascia p&p £2 50 with aluminium rotary controls and pushbuttons, red mains indicator and stereo jack socket Function switch for mic magnetic and crystal pick-ups, tape, tuner, and auxiliary Rear panel leatures two mains outlets DIN speaker and input sockets, plus fuse 20 + 20 watts rms 40+40 watts peak 30 WATT AMPLIFIER KIT For the experienced constructor complete in every detail Similar facilities as Viscount IV amplifier 60+60 peak

30

x

f29.00 p8p (7.50

*

SPECIAL OFFER: PACKAGE PRICE WITH 3000 KIT Mk II version operates into 4 to 15 ohms speakers Specially designed by RT VC for the experienced constructor, complete in every detail Same facilities as Viscount IV amplifier 60+60 peak supplied with 2 GOOD MANS COMPACT 12" Bass woofers with cropped sides 14,000 Gauss magnet. 30 watts rms handling + 31/4" approx p&p £4 tweeters and crossovers.

00f 49.00

NOW AVAILABLE fully built and tested Output p&p £2 30+30 watts rms. 60+60 peak.

50E39.00

£75.00

AM/FM with clock.

£41.95

EEC-RONICS TODAY INTERNATIONAL

e

63"

50 watts rms 100 watts peak output Big features include two disc inputs, both for ceramic cartridges, tape input and microphone input Level mixing controls fitted with integral push-pull switches Independent bass and treble controls and master volume SPECIAL OFFER The above 50 watt amp plus 4 GoodmansType 8P 8" speakers Package price (45 00 + f4 00 P&P

L 100 WAIT MONO DISCO AMII Sue applpa 14- . 4- . 10184 uohed aluminum laqua and ratan Cr 70

-

five rertnaf slide oc tape level m c level deck level PLUS INTER DECK FADER for pert ecr graduated change from record deck No to 10 watt E57 No 2. or vice versa Pre fade level control 140 wan peak (PFL) lets YOU hear next disc before fading & p [4.00 p it in- VU meter monitors output level. 100 watt E65 Output 100 watts RMS 200 watts peak. 1

BOS 95 TYPE Belt drive chassis turntable

ADD-ON STEREO CASSETTE TAPE DECK KIT Designed for the experienced 0.1 Y. man. This kit comprises of a rape transport mechanism, ready built and tested record replay electronics with twin V U meters and level control for mating with mechanism Specificelions: Sensitivity - Mic 0 85 mV a 20K OHMS: Din 40mV 1KHz 400K OHMS Output - 300mV RMS per channel from 2K OHMS source. Cross Talk - -30dh Tapé Counter ± 6db 40Hz -8KHz 3 Digit- Resettable: Frequency Response Deck Motor - 9 Volt DC with electronic speed regulations Key Functions - Record, Rewind, 995 p & o E2 50 Fast Forward. Play, Stop & Elect. Opt. extras. Mains transformer to suite £2.50 + E1 p & p.

1

less cartridge

323 EDGWARE

record player less cartridge.

1111.ARTRIROEt to suit above .eor.imapMli[dul.a

21E HIGH STREET, ACTON W3 6NG

All items subject to availability. Price correct at 1.10.78 and subject to chance without notice.

- NOVEMBER 1978

f24.95

f 15.95 r2

55

p

&

p

f4.95

BSA autocratic record player deck cueing device f2.55 p & p and stereo ceramic head. GARRARD DECK CC1OA. Record changer with cue and stereo ceramic cartridge. Size 12" x 8yí' approx. (2.00 p & p

f9.95 f7.95

PERSONAL SHOPPERS GARRARD 86SB Deck

f24.95

GAARARO35s8 Deck

£24.95

GARRARD SP25 MKIV Deck with Shure head.

£26.95

PORTABLE DISCO CONSOLE

ROAD, LONDON W2

ALL PRICES INCLUDE VAT AT 12'/i%

E2 55 p & p

BSR MP60 TYPE Single play

Order by giving credit card number ONLY

18.95 f10.95 LW, SW and

_

P&P £2 50

O (_9

:

£20.00 L

Inc crossovers

1tEEIWASTER Super Scare TV Game ewer Astor mans operation

rte.

f 13.95

f 5.95

WILIARD Built power supply

emote

f 5.95 f 7.95

f1.00

IMSIC CENTRE CABINET with hinged smoke aee4c top, finished in natural teak veneers, mom 304" s 14'1" x11/4" approx

m.le1e with

/2.50

f3.50 (24.95

Mains power supply for above unit LBITEK Monitor loudspeaker cabinet see approx 431/4" x 151/2" a 151/4"

pt

(29.95 Size approx

£29.90

/13.95

,25 Wert Power Amp Module

.-

F'}

L 1 1.95 .7

sea cartridge reedy wired.

1

50 WATT MONO DISCO AMP

VALUE FOR PERSONAL S HOPPERS BSR Record auto deck on

95p

P+P50P

TRADE ENQUIRIES INVITED

t

lie 16

.7J

f9.95

OUR PRICE

P&P(250

VOLUME and BALANCE

1

Ready built Designed in aslim l orm for compact modern installation

p L

L

í1.00p+p

Recommended set of rotary stereo controls comprising BASS, TREBLE,

AM/FM

AM/FM STEREO TUNER AMPLIFIER CHASSIS COMPLETE

1

Suitable power supply parts including mains transformer, rectifier, smoothing and output capacitors

x LP1179/2 FMTuning headwith AM gang, t e LP1165/ IF module, 2 e LP1173/10w RMS output power audio amp modules + LP1182/2 Stereo pre amp for ceramic and auxiliary input

PACK 3

(405

selection switch Power Supply Selenium Bridge -35V OC from 210 250V AC 50Hz input Aerial Fertile 8" c'/e" built into chassis lot LW and MW plus flying lead for FM aerial Power Owen 5 watts per channel Sine at 2% THO into 15 Ohm 7 watts speech and music Tye Sensitivity Playback 400mV/30K OHM for max output Record 200mV/50K output available from 25KHz 1150mV/100K1 devlahon 1dB FM signal Frequienoy Range (Audio) 50Hz lo 17 KHz within Rdio FM sensitivity for 3dB below limiting better than 10 uV AM sensnrvity for 20 dB S/N MW 350 uV/Metre LW mV/Metre 4 Sae appma length 16" a height 23" a depth 48"

ACCESSORIES

leilll buill-in

re-amp

terms mere

Here's the big -value portable disco crosole horn RT -VC! b textures a petrel BSR MP 80 typa auto -return, single play prnless.oeal controls te azures decks Plus ae

le

lit

led it, pre 4W bas arto p.dam.ncas Seger Camara mio ami manna surf of ululai molded o 8 0 (6 50 raw

64.00

83

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IC TEST CLIPS, cl rp over lC while still soldered to pcb Of In wekel Gold PI Mad pins, ideal for experimenters or senne engineers 2 E an OR Cl. 75, 40 pin DILE200 Or ove by tuvng enact each la F3 50

fllitiM4Mbllg

MAENS TVPFI1%360 input. 15V et 30OmA output Ct SO each MAIRETilANEFORMEIEC, type 411:100, 220 I TO 20. OV rnpui, ASV al 30mA output

2413V

- ADD

CALLERS WELCOME BY APPOINTMENT ONLY

MIXED COMPONENT PACES. Conummq u ,ugfl

^^^"

spend le. Sop each

'- ----ex

dia

3/e

deep

1

3

ALL BELOW

cap/ meow. etwlches. pole_ etc All new, and hundred* of n.mt 02,00 per peck +SIe &bate 'ni

IC AUDIO AMP ICE. Output 3 wane ell, speaker 120 OC supply siaaapp 5'6" a

.,

3

ohm

li'gn

2

I'S'r x

/16

5

squar s 3101501,

DECIMAL KEV en ARDS,

e

- ADD 8% VAT

ALL BELOW

5 for 70p VIDICON SCAN COILS (Transistor type, but no date) so mietetee with vid yid nn base co 50 earn Brand new AEI CSIDB/R CS10R R MIC ROW4VE DIODES up to %- Band max noise ligure B.509 41 9 3756110 800 h

DUAL T01R HEATSIN KS

with

1

GLASS READ FEEDtHROUGH INSULATORS. weer rr nut. overall S. Smut pack of apprize 501er 50o LARGE GLASS BEAD FEEDTHROUGH INSULATORS as ,pan but Oren. de pack of appear 50 for 70p 20V RELAYS PCB mown.' type Rngte pore change over 350 each .1.25 10 7MHz SSB %TAL FILL ERS 12 ASH, Sandwl dlh) Low £1,75 imp type, C enter and unw anted ud.Wnd rejection £2,10 m n -40dß peed 10 698 3561070185 xlals for £2,45 c -. app.. LBB LSO NOT SUem 'ax. X 1 X E3.10 1 F1000 each £3.50 LOW PASS FILTERS (low imp ty 2-9MHz, small £4.47 e.Pmr encapsulate', Xa.0 dr t) £4,25 75p each

er

DI E -CAST SORES BEIE epproe,

4 3

4

48 4

B

68

4.8 6.8

x

2 3

x 2 3 x 3 8

x15

x 3 8

x 2 x2

x 4 8 x 3 x 4 8

x

1

11 a

60. 3omw'

(121 601 38mm ( (121 x 95e 25mm1 (121x 90 SImml (171x Irving

x3 1121x95x76mml x4 (171x 121 x 101 m m)

86 a58 x2 (222a146x51mm) 106

x68 x2 (273x171x51mm) THE NEW EAGLE INT ZONAL CATALOGUE IS AVAILABLE ON REQUEST eonummg Arid u mew end test enurement etc SPIRALUX loan rot Elenrene% en rhuue l

3Opf IEENIVE TRIMM ERS. Brand new, 4 tor 50p Min, Spi AIR SPACE TRIMMERS, approx 14

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POST PAID (UK ONLY). SAE WITH ENQUIRIES

8 % VAT

1" WIHI,nlayal heatemt complete with -to min 50 N CAD 200 each each CHARGER CONVERTER PCB. 1Lo w power :evened Sue avenue 4" x 1 N' x1 -high 12VDC SLOW-MOTION MOTORS, 120V 50Hz 1RPM Sue supply 60V DC output throng h pot on pub for approx 2 dia 11/2 deep, with Te spindle, 60p each, charging Needs etc Ildeel loi charging portable or 2 for 111 00 barren@, from mobile' supply) very need. One V DC MOTORS (Ideal for model makers quite 11/2V 50550 r 51 53 o stmultrt nanhInoi when can be gewerful), 50p each mounted erect on the p. b vin an board Idle d with a SUB -MINIATURE ROTARY SWITCHES, 4 x 5-way star -type nee1Ynk ( not supplied/ 43 Desert, 0

£2.00)

£5.30

-

SAF to

ALL BELOW ADD 121/z% VAT

r

".^^'^

^active type when pressed cognac Is go from 0rCto approx 25 4MHz STAI PACKS (10 esscrled ahne between 4MHr ohm. Swnctemonly no en roder. Sire a pprox. 3 x CELESTION 8 X 5 ELIPTICAL SPEAKERS 20 abet and 5MHr1. Our only r 00 pack 3 with large wore touch plates 0.9 F Clear, A R. SOLDE R SUCKERSRete.i3On 3 watts rated 111 50 each + 121/256 VAT. /Prom., Tvne, ans spare. Few only, K2 00 while slockst VARICAP TUNERS Mullard type. ELC1043/05. Standard Model. £5 50 last!varcn v E5.00 Skirted Model £6 00 BSR AUTOCHANGE RECORS PI AVER COCCO TRANSISTORS dove* 33-45-78 tom for 12 records WELLER WP6O0 Mains operated temperaluee control 10 BFY51 Trrtelwon 4 for 60P idled wnh SC 12M Stereo Ceremlc cermdge and alvll lolderog Iron 41500 BC., 72 Trensnrols d for SOp Brand newt rid n0 121,% VAT SPARE TIPS the WW001 Two types :fiable TYPE BS%2O NHF e.t: mull I. 31or 500 GARRARD AUTOCHANGE RECORD PLAYER DECKS CCT LW8001 Sanded TYPE 447(W6001 Fee, up BC 107 Vestal con) 4 tor 500 Model 6 300, wen cue deuce, 3345 78 rpm for Cl 60 each BC108 (metal can/ 4 for Sop 7 10 12 rewords Fined was 69416 Stereo WELLER TCP2 Nmpemlure controlled .nldonng don PIC 1081plasec SCI081. S for 50p. Cenme saldge Ana lí.11 Stand new. 5.1s 00 r and PU213 paver und Refixes Welter TCP I I Iron SPIS? (UHF amp. nosedl. 3 im 50p 12Kw VAT PEU r.30 00 Spare bos CC] Mandndi or K 7 timer 2N3815 Eel ale' 5Dp. TV LANE LINEARITY COILS Soee.S offer 10 for C1 00 opi Tl SO etch OCT 48 NON SILICON, 4Ica 50p he SCAN COILS B "W. re hi 110 degree tubes. 511dnt Swnciwe 2 pals make ana beak her can be used PNP SILICON. 4f,tu S o3p5 TV Plugs as I pole cnr,gaayer by Im4lerg the type/ 4 Par 500 Net/centre RIn/. 3 ern Din (mewl Plugs, 4 for 500 Arm 50p 0100 Dm 3 -an Une socket. 15p each SCR54O0Va13A stud pipe. 2 Tor f100. 0 Speak Ski 2 -pin 41a 30p 11P3955 Some PNP efOlslp. 60V el 15* 90 PLASTIC PROJECT BORES. with sees on has Ill. DubiIIOI Eloctrelynes. 5015E 450V 2 for SOP Waiti. FIN pack typee 2 Mr V SO black ASSI weih brass irren* Oo5Ater Eltetrolyuea. 100a F 2150 2 for 504 Type N511 Apra. 3 x 2l, x GERMANIUM DIODES appro. 30ío. 30p Plessey Electrolytes 470e f 53V 31or Soo 45p neck 104 148 11 09141 modes 10 Mt 35p Type NB? appro 31A n 21/4 x I II 55p TCC Elecualw.cs 'Woof 30V. 3 for 60p ype 11O3 approx a'A x.A X 11/2 65p each Uubilier Electrolyhcs 5000p F 35V. 50p each VALVES bps nOH appro* 855 x 514 DubClef Electrolytes. 5000% F 50V 60p 81/2 x 51/2 x x 354 60p each 334 Ft 50 each each 0.0.V03, 20A (ex equipment). E3 00 r 25V high grade, screw Slide r SWltrhel 2 pale make and br )or can be used ITT EtechoMUs. S800a OQV03i10fee equipment) 75por2 for E7 20 1 Pole Olande le.miners we maunbng clips 6 Op each. -over by 'Inking t he wo centre pins). 8e$1 68H6 (ex. equipmem). 2 for 50p Ober PAS appro. 300 piece, or 50p All the above valves are untested, except for heaters OSM OR 100 REED RELAY COILS (1k Bin mood Values. OW? selecwon 41 00 seen y o col) to hi and no guarantee of percentage of emission is given 14 reeds woe wo phedl. 2 for 50p Sorry, no returns HF C HONES wound an r, X I long tes, 4 far MULLARD 85A2 85V STABILISER VALVES (brand 90 A RANGE OF CAPACITORS AVAILABLE AT newt 70p each or 2for £1 20. VHF CHOKES wound on 5 -hole rubular ferries u5 lot 1

LARGE ELECTROLVTI C PACKS. Contain range of large ele ceplpe capanm rs, low and high voltage types. over 40 pieces. [3.00 pe r pack (+ 12'/1% VAT) FULL RANGE OF BERNARDS 8A60h' IN STOCK S 4 E TOR LIS"

1

Er

r6001(

ECTPONICE_

ANEW RANGE OP DUALITY BORES INSTRUMENT CASES Aluedniam epees emit Lid.

4810

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tlâr rl 2g Km

6,4. r

AB13 41114

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AB15

4815 4617 4815

pC55065G5pJAmpet4Oe

*1 7 E3.SG El 25

6,4.

l''

VIne Coated In.Inln.ent Came

Blu. Tops with Plein Lower Sseione very smart finish

W81 WB2 WB3 WB4

5x216x21/4 6x4Yzc756

Wes

11K

Typ.-

76p

c135

Bx562

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9x5

wes WB7.

.

12x 8x5

E1.80 £2.00 £2 £2 £2 £2

11x

WBB53

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..

25

50 85

25

. 'it r

rnn.ca awe run

Buy direct rom t e importers and get more scope for your money

LIST.

LISTEN TO THE SECRET WORLD OF PLANTS

KRAMER & CO' 4.. Oscilloscope for under £100 (as

nt

As featured on Horizon, Nationwide, Radio and Worldwide Press

FIRST TIME IN THE U.K. IN KIT FORM, THE REVOLUTIONARY CONCEPT OF A BIOLOGICAL AMPLIFIER AND SOUND SYNTHESISER IN ONE UNIT, THE AMAZING

recommended by ETI)

Bío Activity :le

1

'-1114

Translator

* * *

Experience the unique musical form of plants Hear the beautiful patterns of sound created by their natural response Compare house plants reactions to people with the distinct tunes of those outside Easy to operate, internal speaker and batteries

-

* Anwlro Translator

SPECIFICATIONS

ELECTRICAL DATA VERTICAL AXIS SYl. Deflecnnn

- -

nn,.t V/ division Bandwidth Ibetwee n 20h - - VO 1st DC 5M112 Input Mener** tealrtrrated) slop 0 1, 0.2, 0 5, 1, 2, 5, 10. 20 50 ds Mpu Impedance - 1 Meg 40 0 en ahunt Input Voltage Max 600V P.P HORUONTAL AXIS 01 Deilecpon Senpiwey -400mV/division Bandwidth Amcor (b 3 dB He 350KHs Gran Control Commuters when e me bases in EXT position Input Imp.der.a points rmart Voltage Meg Mea 600V P P

-

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1

-9 -

-

-

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-0

TIME BASE Sweep Range Iahb/eep OThesec, d,v ro 1e sec me on Swept FINE Coned between bmNMM cahbgjmn PoWon Nanking inter nal on all rengis SYNCHRONISATION steps -10010400 Internet exhume, Synrhrnnhalion Level Serene', atm

Cin-

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printing

CashCa

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otturo,

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with order

£991+

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enamelled epoxy

Test leads evadable E2

and

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08 carriage Total 11109) Oscilloscope Offer, Kramer & Co. 9 October Place, Holders Hill Road London NW 4 16J Tea

T

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01.203 2473. T

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84

The naturally generated bio electrical poten rial across a plant leaf Is picked up by 2 carbon loam electrodes When ampli lied and filtered. a VCO, VCA and other ingenious synthesiser circuits are

1

- Ver

OWES SUPPLY Input voltage -115/220V AC+10% at 50160Hz Power Dissi pa bon 18W ITT DATA flat face single beam. 4 Maximum high voltage 1.5kV Fitted wdh 8x10 di mon blue Idler graticule PHYSICAL DATA Dimensions- 15cm (h)x 20 5cm (w)x 28cm (d) Weight -43Kg (approx ( Stand 2 posmon flat and inclined Case Steel. epoxy enamelled Front Panel Aluminium. P

411

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and Govemmem

The Kt, includes 6 C 's. 2 Transistors al high quality components, tinned and drilled fibreglass p c b loudspeaker a nd comprehensive assembly instrucfions. Also Included is a free case read y punched, with wooden end cheeks and stick -on silk-screened front panel for a really professional finish. Runs on 2 41/2.volt hattenes (not supplied), I

I

SPECIAL INTRODUCTORY OFFER INCLUDES FREE CASE KIT £19.90 ASSEMBLED AND TESTED £27.50 ; Pty p Allow 21 days for delivery. Sen d Cheque or postal order to (Mad Order JEREMY LORD S YNTHESISERS (DEPT. ETI)

7 LONDON

on.

,LILE, LONDON, W.4

ELECTRONICS TODAY INTERNATIONAL

- NOVEMBER 1978

NEWS'

audiophi 1

.............................

woeful tale of the pre -amp to make you red in the face this month. Crimsons CPR1 considered by Ron Harris who recovered enough to visit Sony's launching of sixty new models! A

MEANWHILE back at the Crimson pre -amp, shall begin this month by finishing what began last, and furnishing details of the CPR1 module. To begin with, quoting specs would be largely superfluous in this context, but as know there are some of you out there high on numbers, try these for size: I

I

I

Crimson make out a very good case in their design notes for doing things their way, but nonetheless there are a few things would like to disagree with. Firstly they feed straight into the volume control with auxiliary inputs via the selector switch. This presents the equipment driving into the amp with a varying load, and would personally prefer to see a high impedence buffer in there, with a lower sensitivity, than the 70 mV now prevailing, and a higher input impedance. A small point perhaps, but under music conditions a constant load is to be preferred feel I

I

-

mag 3.4 mV RMS (1 kHz) 70 mV RMS kHz all others

SENSITIVITY

I

1

I

for 770 mV RMS output SIGNAL/NOISE:

-70dB

unweighted 10kHz bandwidth

mag

-86dB unweighted

10kHz bandwidth

others

-80dB

20 Hz -20 kHz 008% any level below clipping

CROSSTALK

-H D:

There are pages of figures in the leaflets Crimson ssue for free, so if you've at all interested get after one of -^ose. The nice thing about these specs is their com=eteness nothing hidden away here in shrouds of -viality All the parameters are given as test results _-der very precise conditions. could find no reason to ague with any of them and as I'm usually mean and -arty about such things Crimson should take that as

-

I

:raise indeed

=_.ver requirements are simply 15-0-15 at under DOmA, and mine measured in the region of 40mA per

-rannel while in full flow. Crimson naturally produce a xu for this, and it is termed not unreasonably REG1 The pre -amp arrives as an assembled PCB with set of gccl,cation notes, and as such cannot be considered a kit 2.. any but the most stretched imagination Not for the tec nner this, as a fair bit of experience comes in most 'randy although the notes are very good (but poorly ;iimrsuced) and if you're feeling brave by all means get not too loud 'c .rx in shan't say 'I told you' -.way .fter a few minutes fussing around with pen and ,fie- decided to house pre -amp and PSU in separate A.:S with appropriate nod in direction of Meridian -eason of neatness and hum foiling. Let me say now thra- These circuits are good enough to merit such

-

-

I

-

I

i

r

on -.s there are no tone controls, metalwork is simplified clad to say, and for a basic system should be very

ndeed

E-RONICS

-

Back To Wires Anyway to return to the point the CPR1 auditioned very well indeed Mind you our first sample gave me a hard time for a while It kept doing things it couldn't do and doing them when least expected it After a few bottles of Vallium and several hair pulling sessions with Crimson we discovered I'd been given a non -production board. A quick GPO job and we're back in business Sanity is I

building Up To It

-

Secondly the magnetic input is 'fairly' standard although better than most would differ from Crimson philosophy enough to prefer the idea of buf fering the cartridge input at a con stant value, say 47k//2 OOp with unity gain in the first stage, picking up equalis ation over two further stages both run at lower gain than usual This configuration results in a cleaner sound with better transient performance providing the capacitance of each stage is carefully designed for I'm offering up these ideas for perusal, not criticising Crimson in particular, its just that the Crimson approach encourages you to drag out your personal theories and give 'em a good airing. I'd be very interested to hear from any of you out there with your ideas on how audio design should be done we'll print the best we get.

TODAY INTERNATIONAL

- NOVEMBER 1978

-

saved I

still don't know what the odd sample was up to further that way lies

and don't intend to to find out any

madness

I

suspect Crimson save that board to

assassinate reviewers in the most fiendish way possible Who'd believe it was murder? The production model has never given the slightest problem and has behaved impeccably throughout. I compliment Crimson on the attentive way they panicked along with me over the rogue PCB, several poor unsuspecting boards now on soak test because of my nervous

breakdown.

Inputting Pickups To use this input, you add

a passive network to the input to optimise loading for the particular device in use Crimson themselves recommend adding several net-

works and switches to increase flexibility don't Switches at this signal level are a menace if you don t believe me, see Stan Curtis's article elsewhere in this

-

I

EE

issue. Leave out the switches and hardware for your choice of pickup how often do you change anyway? With the switches added a thickening of detail occurs, and transients don't transient nearly as well. Other inputs are straightforward, although perhaps a little low on input impedance. Noise and hum were commendably low on all inputs, and the separate boxes earn their worth on first power -up. The ten second switch -on blank period to eliminate 'clunks' is a great idea, although on both my samples the delay was so long almost had time to go make a cup of tea before power came through. It can be most detrimental to confidence to be left standing there soldering iron still smoking, poised, over the completed unit hand on power switch counting off seconds wond ering why the b. hell it hasn't come on yet. Smiles fade rapidly like that

-

I

,

...y

Listen In input the Crimson CPR 1 produced a very nice sound indeed, of very high quality with good detail and fair extension into the bass registers. On a quick A -B with a very highly priced integrated amp the CPR1 surprised me by showing itself clearly superior! OK On magnetic

Outlook: Warm and Sony

Sony have gone berserk. Only gone and scrapped practically their entire hi-fi range they have and launched no less than 60 new models if you please. Its enough to give leaflet collectors a heart attack. There is some very clever gadgetry in amongst the flock, and scattered here before you are some of the gems. The TA -E88 looks very, very interesting indeed, representing as it does the state-of-the-art for Japanese pre -amp design. I'm at present still on my knees to Sony (and my trousers are wearing out fast) to get a closer look so hopefully more details on that one later (Please Mr Sony?

...

Sir?).

T he G1 a nd G7 spe akers cam e as a surprise too, they 're bette r than any oriental o ffering previously to assa it my ea r drums, a nd are ca pable of giving any corn petitor a good run fo r its cones

They have divided up super -fi franc hise. This best dealers c an sell the division looks to be a bit

-

wheel out the heavies. wiseguy Now my personal idol amongst pre -amps is the Lecson AC1 which feel has never been approached for quality of reproduction, at any price As such it makes an excellent reference against which to judge lesser machines. However not everyone agrees, and a champion of the Naim offered up his favourite to give the

011111111

I

Crimson a run. You can see from the opposition how seriously the CPR1 managed to get itself taken. Against the Lecson it was frankly outclassed. The AC1 had better depth, and better bass control. Treble came out smoother from the Lecson showing up the Crimson as slightly hard in this register. Mind you the Lecson costs nearly ten times as much and the Crimson gave a very good account of itself. Comparing it with the Naim unit nearly lost me a friend. preferred the CPR1 There was not much in it mind you, and Crimson can be justly proud to have produced a home build design capable of this level of performance. I

!

grumbles A few niggles. The balance control is very limited in operation More so than is even trendy, never mind useful, and a little extra swing would do no harm. I'm not at all happy about those auxiliary inputs really, but they seemed to cause no problems so l'll shut up about them. In order to obtain the level of performance the design can offer very careful construction is required. All cables sc reened. All as short as possible. Good soldering. Good ea rthing. Isolated PSU and sound routing of ca rrymg HT away f rom anywhere at signal Le ave the on -off switch on the PSU box so that

-

need not even enter the case.

cables level. mains

Also the subjective quality, although of a very high quality, is a little hard, and judged against the best designs around slightly lacking in detail.Still none of this detracts from the fact that here we have a DIY amplifier that can compete with the very best commercial units, and make mincemeat of many far higher priced designs. Highly recommended

86

the dealers too, creating a new basically means that only the best of the range, although the unsure in places.

Ell

na. t

Q

And here we have the TC K8B the new £469 cassette deck released as pa rt of the super -fi Sony range. It incorporates that mag nificent LCD display (det ails on the right) and on the short listen so far gave an exce lient audio account of itself.

Below: the G1 speakers. Very good indeed for the price (circa £190 the pair) and deserving of none of the usual anti-Japanese speaker bias. Give them a listen if you get the chance.

NEWS:Audiophile LCD Peak Programme Meter

Pola Ong

prep Eisen oil

rawfu=>iiii

Spr;,iq,,ry o

unnnumarineznf1 rl iilalnraen 11,

Polannng plate

Ughf Glass

Glass

Loud crystal

Above: the LCD level meter as used in the TCK8B in close-up. This uses 64 segments to indicate signal level, and has red settable stops to hold peak values. The colours are nice too!

This is a nice touch. A portable Elcaset machine. Gives really nice reproduction and is quite easy to cart around. All the controls are mounted so as to be accessible when in mid -carry. The format would seem to be ideal for this usage. All the quality of a reel-to-reel and no'fiddling about while rapidly unspooling tape in a gale! Priced sensibly at £459 and called the EL D8 for the wandering rich amongst you.

Not that I'm obsessed with cassette decks or anything, but here's another one. The TC K6B this time. It's main cede gimmick is the MPU program selector. That little LED isplay in the centre can be stepped to read the number of tiro track you wish to hear. The machine will promptly go and find it and play it for you. Again LCD level meters, although not as good as the TC K8Bs obviously less segments. Below: The incredible TAE8B. The unit has two COMPLETELY separate channels inside its box. Selectable phono load on one input, and one straight in for people who don't like switches in line (Like me) at this law level. Moving coil pre -pre amp is standard of course. Price £699 (What did you expect?)

87

Greenbank Electronics

AS RECOMMENDED

BY ELECTRONICS TODAY

111080590'

CMOS

INTERNATIONAL JULY 1978

These cul prices for Amateur Users 841 quantity prices available

Lal 511600 5010 Oar tall nntA r 11 1St ,er 9.444

Export 50104 bóM4141 Y6M1-

Mostly Motorola, RCA

4" Oscilloscope

ALTERNATIVE MODEL

FROM STOCK

£99

3" OSCILLOSCOPE otherwise specification as 4

£85.50

model OCK

74602 14604 74608 74610 74614 74620 74630 74632 74642 74648 74673 74674 74676 14683

-- - V/division 5MHz -9 0.1, 0.2, 0.5, 10.20 50V/div -- 600V Meg/40 shunt -Hz-350KHz 0-400m /division - Continuous, when time -600VMeg position - 100msec/div to sec/ div steps -includes Variable between steps timebase calibration position - Internal - ranges -- Internal, external Continues from positive to negative Voltage -Input 18W - 4in. - flat face, single - Maximum high voltage 1.5kV -blueFitted with 8x10 division filter graticule -28cm 20.5cm (w) -- 4.3Kgposition, (approx) flat clined -- Steel, epoxy enamelled Aluminium, enamelled epoxy printing 100m DC

step

Deflection Sensitivity Bandwidth (between 3 dB points) Input Attenuator (calib-

-

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P.P V

2000

base in EXT

14cm (h) x (d)

PHYSICAL DATA Dimensions

Weight Case

Front Panel

yRRys

88

A

15

lip 11

1.10 45p 115

flip

It

(2.011

11.01 11.45 40.91 (1.19 52.45

(1.10 41.11 12.45

LLli 185 755

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1111.10

1149 MII

M/1 675

1]40

1011 1161 1069 1070

229 205 Yip

41.21

40109

(1.02

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11.50

(1.59 (6.09 10.50

1101

(7.11 12.03 TI1 £11.32 17.98 111.50 (2.47 12.17

11/1

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13.12 13.12

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1513

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21.14 11.55 13.61 111.55

1700

01 11111750E

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515'510

£1211

COMM 0.1P4/17

11901Y

1405" Olaf 10pa0R

(0,95 CIOCI (NIPS

4-l'11144

£2.60

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MI 50253

13.11

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11.19 715.

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1630 111.01

SII 01C108 COUMfE111 Ml 503501,1 2175

13.04 11.11 13.69 11.14

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4513 4511 4515 1591

11.31 Blp

46141114041

13.10

151e

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1659 1500

15.71

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11.45

4651 1551

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11.12

1511 1532

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(4 :13

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56.96

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11.09 11.50

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1501 1512 4513 1504 1505 4507

5/5

5528 4520 4570

236 494

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11.05

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11.54 14.1 2 81.76

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112.12

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£2.50

41116

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£14O 11.05 11.05 01.72 11.10 41.45

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117E 4527

£1.01

4419 4177 4411 1433 4433 64401 1151

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32p 219 215 215 745

till

1511

4513 4520 4571 1622 4594

11.01 01.01 11.01

44155

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4017 4171 4111 4002 6185

4

11.41 11.41 11.11 11.40 11.01

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401191

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24p 24p 24p 24p 24p

74085 74086 74089 74090 74063 74095 740107 740150 740151 746154 746157 746150 746161 746162 746163

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24p 24p 24p

92p E1.38 54p 56p 54p E1.29

01.29 64p E4.38 85p

740164 740165 740173 740174 740175 740192 740193 740195 740200

II

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71p 43p 01

71140101.115111 Clock Lou

12.06

54

131 I 71

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while £2.06

E1.04 £1.04

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740905 E7.26 740906 54p 740907 54p 740908 96p 740909 E1.63 740910 06.78 740911 71111 740912 07.13 740914 ..__.. E1.41 -.._. 746915 E1.10 746914 E1.06 746925 £11.113 746921 E11.63 746922 E3.66 746923 f3.73

90p £1.51 90p E1.10

85p E1.04 E1.22 E4,12 E2.46 E3.67 74C221 E2.20 746373 £1.10 746901 £1.10 746902 E1.10 746903 E1.10 746904

KHz

£1.10 01.04 E6.78 E1.36 E1.73 54p 54p 54p 54p

Yll Ir IM41 INmll

OM .2 Ohl

Ch 36 Vision Modulator £2.50 Dino Wide Bandwidth £4 70 Sound Modulator E2.50

746924 74C925 746926 746921 746926 746929

E3.92

262 144 KHz 301 z KHz 312 5 KHz

£3.92 E3 92 E3 92

4550

£392

KHz

MHz

155 21.81 1A.44 e4

o

C4 44 £

I3

1

I

4433619 MHz 4 4

4 5

608 MHz 800 MHz 915 MHz 000 MHz

5 120 MHz 5 185 MHz

000 MHz 6 144 MHz 6 400 MHz 6 55360 MHz 7 000 MHz 7 168 MHz 6

7.810 110

1.01437507 141111110 388608 MHz 800 MHz 10 000 MHz 10 700 MHz

23

E3 23

£323 £3 23 E3.23 E3.23 E3.23

E3.23 E3.23 £3.23 £3.23 03 23

1123 1311 1123

8

E3 23

9

03.23 E3.23 E3 23 E3.23 E3 23

1431010 MHz 18

ON MHz

0:417152 M.110 M52 22.1114 Mb 276411152 2£055 405

411M MU

10100 MU 114100 ON

kil, and you know Thal, due to incomplete address de coding and various hardware limilalions, it is hardly any more use Man a

f] 20

G.23 1127 C1.23 15.13 13.23 13.23 13.20

ROM,

some RAM working space and Input/0u1pul ports.

You need: a "SC/ PROTO BOARD! Price £5 95 6014

a

w

SCAMP II.

15151

£930 110.10 (41.95

al

4401II

rkR

'A Guide to

20/4p

o

2111755

E67 27

II

[National)

017121014 Ira

on

£1.20 11.75 13.25

11195 11115

1a41114W

W 54104 554 SPECIAL 2100\7\Mq

15,50 1.151 755

113J5

A

:et M1NI0p15g5Il0llUan.: 1 IN related 1I1 u.

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PM 110 ae.

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191711912MCN 1MINul 1110:

4I0 pp 11111171 NI/e13Nn ::: 42571491 lM 4111144114411401 11004up

280

10naeap

025-544.23540.1110704450

requeal(When mailable]

a:-..

--

647 le all prices al 6%. except where elated otherwise 2751 par order. Export add 75p (Europe). 42.50 elsewhere. ea YAT Polys. aniveraillea. gaol. depts.. 01c.. can Meehan their orden for immediate eeeeo-e

TERMS Pool. alt.:

£535

41

11102114444441114

C0311C

50p

23.10

200110Eq

LM 1102115 214r

03.50

ala Ior SC/MP

4

Mae

LIMIb111 2111110

8154 IISP-13A/650j Soo

INS

111164411

68711

111511C 0111111

2310 14110

Mr 60801- coming soon

KITING' glemitronl El 00 SC/MP Programming' 0(waitron)

159444 dale for

11167111

5150;

092-4296 16601e Interpreter

E2 75

19.25

0418/1061 umab13

1

CAP

U1a

Wool

61101113111

leo

2111156E43 1112256441

I

a

U9 tremble EPIIOMS 110312M 111 15.95 59941512 1 11 19 95 I7011111g E5.9

150£1 P1M11166111YYY11

c200 pape McMOS 041514011144141 E3.50 'MC 145008 ICU Ha ell11le1 r5141 E1.50 'Understanding Mic rMrlp00ar5 51411 rolai

'A Guide to

CPyae4

U

£11.20 M

0ean 1

yew N NM

9110

M

1

521410814 15P.11

gab Nab nli0lMe 11111r18 115111114 gem 1LMRY11Ia1pIW (5,15

14

q UM.

Mr.

Wit

E950

2101414641

10111151

31/96364 111.75 1a1 8099141e 8

Ira No« 15 eW

£7.95 £5.56

21e12.I05t

Under

leer eeaptlM181E1

d0.4/351 P

74

1em1111I110a1161

9_wu

till aTI17

1111

1141

£03.13 E11.13

111147 (11 DM npeN

E1595 E795

SC/MP II [4MHz1 9080 14500 100 6800

cat

95/6/7/8

50011.6 011p1

plated IIII

u le 1441.114

ACTA

AMM3]0.911115I91

r1181.5

MPU MOPS COSMAC I802

77'.

E4.25 f4 25 E7.17 El 36

PIO

1/512211.111 1171

110EM1100-1roM-11 (NIP 74494544151 714141

1011 IO9fM11E IItI011181MF1

connector and has n119eau Meru 76rMIr

*Men

6820

ALLS

[The hoard is double sided

wish

E750

6850

board for the SC/MP chip, your ewe er your eoluihil in

E4.41

6821 PIO

You're now ready la put SC/MP to WORN. You need a separate circuit

kilo programme

SI

MPR I/O -5-1013 UART

INS 8154 RAM I/O

AY

toy!

£362

f3

ROM CHARACTER GENERATORS

(Check stock helore ordering]

merciai mlcrocompuler

E3.62 E3 92 E3 62 £3 62 £3.23 £3.62 £3 62

£3.23 E1 95 £2.90 £3 23 £3 23 E3 23 £1.25

COMPUTER KITS

CON 7 enea. You ve already pot a cam

£3.62

z 04 8 KHz

691117$

SC

£3 23

E392

000 MHz 3 2768 MHz 3 579545 MHz 4 000 MHz 4 032 MHz 4 096 MHz 4 194304 MHz

and in-

, Elemp3 820.1 404 Edgware 50. London

10

LONDON N2 104

zip

3

Also available from 248 Tottenham Court Road London W1 301 Edware Road, London W2

'r

1811

2 56 z 50 MHz

x

2

Stand

Ili p

1511 4511

1111 4ÓD2 10.20 19153 11.34 10197 125.70 10194 14.10 10251 11.15 1101 115.67 1151

400E

KHz

24576

beam

CRT DATA

40621 4803 4051 4055

lilip

000 MHz 008 MHz 1.8432 MHz 2.000 MHz 2 091152 MHz

on all

Power Dissipation

4061

lip I1p lip

II::

1

1N

10% at

IYp

alp

1

in 5

Blanking SYNCHRONIZATION Selection Synchronization Level POWER SUPPLY

lip

I91aIchJ 100 0 KHz

P.P

-

- 115/220V AC 50/60Hz

32168

pff in

1

Deflection Sensitivity Bandwidth (between 3dB points) Gain Control Input Impedance Input Voltage Max TIME BASE Sweep Range (calibrated) FINE Control

4055 4051 4969 1061

619

MICPI]PßOCESSOflS

1

-

1063

Sap Sep

5

(5.31

1, 2, 5,

1

rated) Input Impedance Input Voltage Max HORIZONTAL AXIS (X)

614

1705

IIp

74C00

SPECIFICATIONS ELECTRICAL DATA VERTICAL AXIS (Y)

721.

'16.

00157 40111

acrylic window Case colour

Appointed London Stockist

IMPORTERS

1115°

L

41p

1050 5051 5052

155 171

[National etc.) 74000 Series

Add VAT £7 92 Carriage £2 08

SOLE UK

Add VAT £7.34 Carriage £1 .50

4000 4001 4002 4006 4007 4006 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049

CINO. Add

UN 25p 14- 2p

=

VAT

522

GREENBANK ELECTRONICS (Dept.

Ti

l E(

Y[ Ne.. Chests. NwJ. New Terne. M'.r.N. 14e.4eY4We L67 54G Enylarq Tel 051-6.15 1) 91

ELECTRONICS TODAY INTERNATIONAL

- NOVEMBER 1978

SINTEL THE SINTEL SIX DIGIT MAINS CLOCK KIT with BLEEP ALARM and TOUCH SWITCH SNOOZE HIGH BRIGHTNESS DISPLAY

AUTOMATIC INTENSITY CONTROL DEEP RED DISPLAY FILTER

SLIM WHITE CASE 205mm r 40mm

e

140mm

BATTERY BACKUP

r

CRYSTAL CONTROL FOR IMPROVED ACCURACY

..

....

...

..

Order as ACK + BBK + XTK The ACK is also available without battery backup and crystal control Order as ACK The kit Is supplied complete with the exception of a mains plug cable and battery

£34 50 E28 80

.

DATABOOKS BEST OF BYTE Volume

E11 95

380 pages Illustrating Basic Intel Memory Design Handbook Intel 8080 Microcomputer Systems User s Manual Intel 8085 Microcomputer Systems User s Manual Motorola Booklet From the Computer to the Microprocessor Motorola McMOS Databook Nol 5 Series B) Motorola M6800 Microprocessor Applications Manual Motorola M6800 Programming Manual National SC/MP Introkit User s Manual National SC/MP Technical Description National Semiconductor TTL Databook 1

E2.45 £ 5 20 E6 50

£6 50 £1 80 E3 50

£12 95 £5.35 £0.75 £1 80 £2 10

RCA CMOS and Linear IC Databook £5 45 Texas Instruments Pin Configuration Guide A very useful set of gloss cards showing top and bottom pin -out views of 7400 ICs plus many others (T Memories Op -Amps etc I E2 95 I

Z80 Assembly Language Programming Manual Zilog ZBO-CPU Technical Manual Zilog Z80 CTC Product Speohcatmns Zilog ZBO-P10 Technical Manual OATASHEETS at 75p each on íM6100 6800 SC/ MP CDP 1802 2650 TMS5501 Z80r P Intel 8085 Also free data on some components.

£7 50 E5 60 £0 80 E3 30 TMS8080 9131

Some Popular Memories available from SINTEL (See ETI DATA SHEET SPECIAL July

1978)

f1 85

2102 450 nsec 1K STATIC RAM 2102 650 nsec STATIC RAM 2708 1K x B bit UV ERASABLE ROM 6508 600 nsec 1K STATIC RAM

95

E1

f8.80 E8.05

KEY: 1:

The bit of chocolate you thought you'd leave for later.

2:

Coffee stains (instant).

3:

4

A useful -sized bit of stiff paper to stop the window from rattling.

ASSEMBLED LATCHED COUNTER MODULES

SIX DIGIT TTL COUNTER MODULE Our range of Industrial Latched Counter Module Kits is now available ready -built These counters use both CMOS and TTL ICs and will save you considerable design purchasing building and de -bugging time Each module uses a set of red LED displays and features a single in-line plug and socket Instructions are provided For full details please send for Catalogue

Rough calculations for your new combined egg timer/laser cannon project.

t

o

!Apt 4

ETI makes a fair soldering iron stand.

The dog insisted on carrying your copy to you along with your slippers.

11411

Built

I41-414 TIS+SI

E1312

2113114

Half our orders for binders are repeats: we think that says a lot for their quality. At £3.00 all inc. you get a great deal of peace of mind too!

Part No

526-412 657-412 721-412

29,22

pSIE

Kil

Pun Nu

10-9E

E10.52 E17 96

SI2-AE 312-50

E25 66

Buen

Part No

!13.122

540470

_22.0

009-470 191-470

E32 3I

Kit E10 42 E10.11

E2505

NEW PRICES AND SOME NEW CMOS ADDITIONS

-

CD4000 CD4001 CD4002 CD4006 CD4007 CD4008

0 15 0 17

0.17 1.04 18 87 50 50

C04009 C04010

WHAT A BIND!

CMOS

TTL Part No

C04011 CD4012 C04013 CD4014 CD4015 CD4016 CD4017 CD401B CD4019 CD4020 CD4021 CD4022 CD4023 CD4024 CD4025 CD4026

1B

20 43 83 .83 -48 .79 .83 .50 11 0 90 0 82 0 18 1

0.70 0.20 1

55

If you need your CMOS by return buy it from SINTEL 044 CD4051 0.64 CD4027 0 82 CD4086 1 39 0.77 CD4052 CD4028 0 82 CD4089 1 03 0.80 0.82 CD4093 C04029 CD4053 1 69 CD4030 0.50 CD4054 1.04 CD4094 2 00 CD4055 0 94 CD4031 1.18 CD4095 CD4096 0.94 CD4032 0 89 CD4056 1 18 3 35 1 25 CD4059 CD4033 4.29 CD4097 0 98 1 71 CD4098 CD4034 CD4060 1 00 1 85 1 06 CD4035 0 98 CD4099 CD4063 2 50 2 86 CD4036 0 55 CD40100 C04066 1 61 0 85 CD4067 CD4037 3 35 CD40101 2 13 0 96 C04038 0 20 CD40102 CD4068 2.13 2 78 CD4039 0 20 CD40103 CD4069 1 10 0 97 CD4040 0 46 CD40104 CD4070 1.06 0 75 CD4041 0.20 CD40105 CD4071 0.62 0.69 CD4072 CD4042 0.20 CD40106 0 69 CD40107 CD4043 0.88 CD4073 0 20 5 36 0 84 CD4044 0 20 CD40108 CD4075 1 03 1 26 CD40109 CD4045 1 17 CD4076 1 19 1 20 CD4046 0 39 CD40160 CD4077 1 19 0 89 CD40161 CD4047 0.20 CD4078 1 19 0 50 CD4048 0 20 CD40162 CD4081 0 50 1 19 CD4049 0 20 CD40163 CD4082 0 43 3 40 CD4050 0 64 CD40181 CD4085

CD40182 CD40192 CD40193 CD40194 CD40257 CD4502 CD4510 CD4511 C04514 CD4515 CD4516 C04518

C04520 CD4527 CD4532 CD4555 0D4556 MC14528 MC14553

IM6508

ICS TODAY INTERNATIONAL

ORDERS TO : SINTEL, PO BOX 75A, OXFORD Tel: 0865 49 791 FAST SERVICE W e wanner, that Telephone Ordem for good. in stock. received by 4.15 Pm 16400 -tri-) we. be deap.tehed on the Game day by 1st Class Peet feue bees1 geed_ .verre item. by parcel post) and our mocking MMAmer custonrn ahardd telephone mid Peer W

- NOVEMBER 1978

1 1

40 40 40

19 48 0.81 1 1

1

01

1

25

2.47 2 82

1.01

0.97 1 04 1 43 1

21

0 78 0 78 O 93

4 43 8.05

For our full range of components send for Free Catalogue Our Offices are at 209 Cowley Road Oxford but please do not use this as a postal address PRICES VALID UNTIL 31st AUGUST 1978 OFFICIAL ORDERS ARE WELCOME from Companies Govt Depts Nam Inds Umvs Polys ORDERS, C W O add VAT @8%i.35p p&p TELEPHONE and CREDIT (Invoice) ORDERS add VAT` 8= p&p minimum charge (the balance will be charged at cost) Please see FAST SERVICE EXPORT ORDERS re,.c_u-e no VAT but add 10% (Europe) 15% (Overseas) for Air Mail p&p For Export postage rates on hea.-, us tirs[

rrs

Binders 2f-27 Oxford Street. London W1R 1RF. ETA

1

Barclaycard number. with Official orders, no

rieur_

a

-

-

gw enter ewe

ee ES

-

®

SIlV'l'EL.

u

lii

ACE MAILTRDIIIX LTD Depl

Teal Sheet

Walieheld,Wttrkshire WFI51R

1©ß0 I.. 20E11 electronics

56 FORTIS GREEN ROAD, MUSWELL HILL, N10 3HN TELEPHONE: 01-883 3705

COMPONENTS - Now over 1,000 types in stock. KITS - See the new range of low-cost 'ELEKITS'. MODULES - New ready -built functions. SERVICE - 1st Class same day despatch. QUALITY - All guaranteed products. PRICES - Many reductions! E PROJECTS - Trouble -free!

OUR LATEST CATALOG U E CONTAINS FREE

Our 2nd edition illustrated catalogue is now available The much increased range shows many welcome price reductions

INTRODUCING

45 pence WORTH OF VOUCHERS

Ae

The new range of easy build kits complete with simple to follow instructions. Battery powered (not supplied). With case.

FABULOUS

CONTAINS MICROPROCESSORS +BOARDS, MEMORIES, TTL, CMOS, ICs, PASSIVES, ETC., ETC.

*BURGLAR ALARM *ROULETTE *BICYCLE SOUND FLASHER *WATER LEVEL ALARM *SIREN Easy build introduc*TIME SWITCH tion to electronics. *BLINKER

-fl SKITS'

SUPERSAVERS

-

included Many hours of enjoy - Many others in preparation in full ACE catalogue send S.A.E. for menr NOW AVAILABLE! free brochure of kit range.

-

Mini ORGAN

ALL FULL SPEC DEVICES

WORSE \TRAINER..--, "

1

\

'

only

/

C

enclose

741

555

T I L209

4 for

10 for

for

(INC CLIP)

£1.00

£1.00

£1.00

VAT INCLUSIVE PRICE + 25p

& P.

P.

A4 IC BOOKLET

30p., please

send catalogue

Name Address "

RED LED

c

Inc.VAT I

TIMER

5

£495' S PR ICES

TEXAS

Refundable with future orders over £5.00.

SUPPLIED FREE WITH ORDERS OF ANY ICsWORTH £5.00 OR MORE, CONTAINS CIRCUITS, PIN CONNECTIONS AND DATA (35p + SAE IF SOLD ALONE).

FOR SERVICE

QUALITY & VALUE

ALL PRICES INCLUDE VAT

atronics

DECODERS TELETEXT -

RF POWER METER -

October '78) (ETI project 139 Most components in stock including F14 @ 16p, F25 @ 28p. PCB £1.00. 12.7mm toroid

2 METER POWER AMP (ETI project 710 - September '76) a simple -to -build, easily -aligned Class C PA suitable for CW and FM amplification at 2 metres from a nominal 3.5V (-ve earth) supply (7 amps at full power). T/R 'switching' is performed by diodes and 1/4 wave lines. A power input of 10 watts is required for the nominal 40 watts output power Complete with cabinet £19.50 + 65p p&p.

This is

1

LOW COST V.D.U. project 560 - Aug Sept Oct '76)

(ET)

/

ALL PRICES VAT INCLUDE

144.60 -£-£157.25

Basic upper case only

Standard decoder

TIFAX MODULE special offer including mounting board and nterface circuitry plus

-

full application information £ 129.35.

All

READY BUILT DECODERS Prices from £230 to a full specification professional model at £310. Send SAE for full details

new

tull

speciticalion, tun

Mostly National and

All components available for this popular low cost V D U project Complete kit at Special Price £64.00 + £1 00 p&p Separate components PCB set £7.20; 2112-2, £4.50; 2513, £8.50; 555, 47p.

-

packing. Send SAE for FREE PRICE LIST or 45p + large (A4) 18 of our Data -Catalogue.

-

7400 SERIES T

/

All prices INCLUDE VAT but please add minimum of

rom aronics t e umber One company for Teletext Decoders for CEEFA> and ORACLE We now offer a wide range starting at below Et 45.00. KITS Based on 'Wireless Wodd' design

.34p

for post and

1/2p

SAE for copy

7400 7402 7403 7404 7406 7406 7410 7411

7412 7414 7420

14p 14p 14p 15p

40p 18p 16p 22p 24p 78p 17p

7421 7427

7428 7430 7432 7440 7442 7447 7473 7474 7475

31p 29p 38p 18p 27p 16p

73p 75p 35p 29p 46p

teX

74e3 74e5 74e6 7490, 7492 7493 7496 74107 74121 74123 74126

o tu:eYNT

Teus

uaranlees products li

78p

£1.24

£1.12

E1.07 69p 72p 999 E1.12

74145 74150 33p 74153 36p 74157 52p 74161 74164 39p 97p 74165 35p 74166 29p 74170 79p 74174 74175 81p on TTL addles ver

£1.12 £1.60 £2.44 94p 94p

74177 74160 74188 74192 74193 74195 74196 74221 74H00 74H04

74810

04p 021.

f3.411

f130

£130 E1.03

£1.90 £1_74 361.

44p 31p

CATRONICS LTD. (Dept. 851), COMMUNICATIONS HOUSE, 20 WALLINGTON SQUARE, WALLINGTON. SURREY SM6 8RG Open 9 am to 6 pm Mon. -Fri., 9 am to 1 pm Sat. Closed for lunch 12.45 to 1.45 pm Telephone: 01-669 6700 90

ELECTRONICS TODAY INTERNATIONAL

-

NOVEMBER 1978

i Readers' Circuits Guitar Sustain Unit S D. Maistre

1000u

=10V

0( P

NOTE

01,2 are 2N3819 03,4,5 are BC109C isOA91 ICI is MC3340 D1

The sustain to be described here holds the output at a constant level over a wide range of input levels. It ruas designed for use with electric guitars and has a maximum effect Kith the guitar pick-up volume full

Digital Bike Speed B.

Lemming

p.

R1

The principle employed is that of

whereby the circuit output IS monitored by a DC voltage follower which controls the gain of the YCA through which the signal passes. The advantages of this circuit are that, unlike many such devices, it does not use opto Coupling which draws too much c_rrent for battery powered equipIrent; it produces no audible distorD ro components are easily obtained

33k

an AGC.

-

-

and cost is low. Construction method is not

LATCH

swt kph

mph

>

>t-

RV1

RESET

VD2

L

iC1

RV2 mph

kph

20k

20k

v,

L

88 SINTEL MOS 2 DIGIT LATCHED COUNTER

ENABLE VssjG

CLOCK 0

01

6

critiCal -

C1

100n

NOTE IC1

unit provides push-bike speed surement between zero and km hr or 100 mph! The circuit based on the Sintel MOS counter which counts the pulses from ohoto transistor Q1 --ese pulses are provided by rc 18 aluminium 'barriers' to the Q1 was an unmarked type in :--ototype, in a TO 18 package. mounts in an old felt-tip pen

ICS TODAY

01

555

is

D1, 2

RBI

are 1N914 2N5777

3V

case opposite the amp so that the barri ers interrupt th e bea m in operaI

tion. The

counter operates whilst

PB1 is pressed, bu t latc hes after a time determined by RV1 or RV2 IC1 and associated components. IC1

forms

a

square -wave oscillator with

variable mark -space ratio. The time for which pin 3 is taken low is determined by RV1 /RV2 this enables the counter. The speedo accuracy is de':e-L= mined by the accuracy of controls RV1 and or P.`. 2

-

tit eT

Tech -Tips is an ideas forum and is not aimed at the beginner We legman we a_ara queries on these items. ETI is prepared to consider circuits or ideas subrdeeor meeleeslerim em me used will be paid for. Drawings should bee dear -tteabie ire Bum remädtrttshesre be typed. Circuits must not be sublact to eagerigillicleimis 111:1MMIREIMMINIV to ETI TECH -TIPS. Electronics Today I..e Wen

s

I

R3 1MO

!

a/

re

-_--âpModlt_

DUAL

HOME COMPUTING NASCOM 1 Build and tested £267.30

VOLTAGE

FLADAR TRANSFORMERS

1/12 Seale R/C E Neu Kit CHESS SETS

PRIMARY 770-240 50HZ. ALTERNATIVE SECOND ART VOLTAGE AND CURRENT AVAILABLE BY SERIES OR PARALLEL CONNECTION ENE

YON

I

606E12

BORIS

I

609E20

1

B0130

130+30

I

1

1

128+28

50FE30

30+30

I

6+0 0+9

10FE06 IOFEME

20FE12

12+12

I

20E515

15+15

1

20E120

I

1

20+20

1

1

TIpA

75p

126E06

3.60

75p

360

75p

75p

MACE

12FE15

3.60

75p

12E120

20+29

70p

086E06

310

70p

08E109

6+6 9+9

310

70p

08FE10

310 310

709

60

1

26 EACH

EACH

65p

06E10

65p

06FE12 06E115

10+10 12+12 15+15

30E130

412-16

60FE30

41Y-14

0 8A EACH

2.60

659

0 6A EACH

230 230

65p

0 5A EACH

65p

360

75p

350

75p

100FE26

1

28-0-28

1

I

C

I

1

4X0

10.45

342

15 70

Switch

5

18 95

UnNmel Maine

l'A

25.00

2.0

60p 60p

British Birds

2.0

60p

Reynard the fox

0.5A EACH

2.0

60p

0 4A EACH

2.0

60p

2.0

60p

0 25A EACH

06A EACH 05A EACH

180

03A EACH

I

B0

50p

0 25A EACH

1

B0

50p

150

509

Poste

1.50

0 20A EACH

150p 50 150p

1

IA

2 . 95

1

L

4 ,70

11 ,

L

, . 560 1100

1

24211nT0

412I5.

00

1

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11.50

75p

1

5A EACH

(50

75p

100EE60

304130

2

5.10

100

2 OA EACH

4.50

151

1006E26

26626

2

11J0

1110,

1

AEepeoe

6

22.10

Hand controls supplied with cartridges

.. [2.80

2290

.

02.50 E4 90

SIC MODELS, 27 Seem Ind. Landon N22 Omer cress eel eae:leelo- I So Antra ed Ms

WE STOCK PARTS TO BUILD MUSICAL

00

t42450 1006E30

Ma n console + mains adaptor £38 90 Cartridge Price 10 games No FREE (with above) No 2 Stuntrider £20.25 No 3 Roadrace £16.95 No 4 Tank battle £23 50

UNBEATABLE LOW PRICES

.

I50 I50p

0 25A FACH

our

All pates mc1.de PRP A POI 121.000

BO 150p

035AEACH

/50nm

.........V,.,,,,n M,...

50p

1

1

Programmable TV Game in col-

01.00

Violon Modulus. Colour [nod.,

show on cover of ETI Oct 78)

1.80 150p

0 4A EACH

0,-9V

.

(as

TV GAMES

EGod",

Memory till

Mivominia

Soon Module

.

t

4 Digit Alarm Clock chip and display G1 CK3000 I.0 + Plasma Display E4-90

7.30

Lewis

2.0

Cr

s

PmlcII. or

£44. 87

Military

EACH

.

1

WE

Price

3

0 SA EACH

0 5A EACH

2.60

IA FACE

30-0-30

6+6

0.66

1A EACH

26-0.26

061E06

086512

of king

Camelot

0 75A EACH

.

1.0A FACE

304150

I

08E115

10+10 12+12 15+15

lA

Height

Set

0111E/

..

1.611GCE

26628

1

12E110

70p

604E52

80FE60

12E109

3.00

1

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6+6 9+9

12EE12

60FE10 13U1E52

NNW

lA EACH

0 8A EACH

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10+10 12+12 15+15

0 9A EACH

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3.60

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EACH

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15+15 20+20

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2.11

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20+20

60E528

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21401130

PROJECTS As published by leading magazines

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£7 50 £5 50 E6 50 E6 50

E0 75

£6 50

BF199 BF200

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£15.00 £30.00

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£480

2N3055 (T03)

253702/3/4

£4300

80

£7 00

F1 70

£14.50

CO

253819

f700

50

£2.50

£7 00 £2 60

LM324 (14 KIL) LM555 (8 DIL)

TANT BEADS 01uí 022y1 047y1

lyf3Sv

2 2p1 35v

47v I

£51.00 £23.00 £15.50

£1.80

LM741 (8 DIL)

£075

£830

£8.00 £11.00 £12.00

£0.95

35

E120

10pf 35v 22u116v

£1 50

£1200

£1.50

HARDWARE DIt Socket E100 14 p.n DIL Socket £1.10 6pin DO Socket £1 20 24 pin OIL Socket £2 00 Min slide Swnnetes f1 50 Min push ro make swllches

£9 00 £9 50 £10 00 £18.00 E12 00

£1.50

£12 00

E

DIODES

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1N4001/2/3

48 £0.55

1N4004/5 1N4007

154148

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E3 90

CO

£5 00 £6 00

70

£2.20

Zener Dmdes 400(nW

E0 75

£5 80

RESISTORS

_

Wait Carbon Film (Min

Single Viocs £1 25 De- " 00 Mined lors of 100 E10.00 per 1000

LEDs

£800

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60

E 1

0 125 Yellow/Green

20 E1 30

£15 00 E 10 00 E10 00

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E2.20

£20.00

Wide range of m c -o Darts crocked Send for free list or visit our showrooms in Keltenng and get hands on experience of the PET2001 m stock now (PET 2001 is distributed b1 our sister company H8 Computers)

£8 00

CCX10 E1

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andin L5.00

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INDUSTAML

HONEYWELL PROXIMITY DETECTOR el Sa 0 C [2,60 n ICI 'or 120

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OSOR M cal 70m

20134A Open

pcurem 59.11.11mm 71p

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MAINE TRANSFORMERS,mn.xwre. all wren NOr pre, 17 roll 100 na amp 60.90.42m m 9So [S 260 E1 l

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95p 15p SOLDER imulucore type) by Sei vcol 10 metes for £1.50 metres for £41. 75p SPEAKERS (miniature) EL84 output

75p 75p 75p

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PAYMENT: Cash Cheque poebel Coddle

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VAT: Add neon

POWER UNIT KIT FOR ABOVE MODELS 25/28 VOLTS E2.95 TAPE HEADS 'A track Redone Mellon %8953u C5.21511 Dam MSS. MIPS 18 E3.110, NULLARD TUNER MODULES wren data LPI t / cdmb,ed AM FM IF nap -CA. IP1179 FM knee end wren AM lung 9.9. deed with LP1171-44. e1P1171 and 79 pou -11.50. a 1,111157 compile AM strop C2.05. A Form Awed -Slip. SEVEN DIGIT MINIATURE COUNTER Sr Durant 12.74 robs 0 C 3 Weis One 40.25H% 551, men E1 mph. O lo C9. 100 ear MM.

SECIINAN 500 6e. Tonerabl1 clackers

1

E10.95 WITH

CIRCUIT

l'

£0 90 £0 95

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*

1

THIS QUALITY AMPLIFIER

for Et, 10-E4, 100-E35. FAIRCHILD FND70 0 15 7 segment display C radaule /0010 en, [11.50. 1

M

£7.00.

*

2

120*

tested,

MC1310 DECODER * 5-BUTTON SELECTOR SWITCHES INPUT SELECTORS FOR GRAM AND TAPE *Suppled co mplete with FRONT-END TUNER AN 0 FERRITE A ERIAL SIMPLE INTERCONNECTE DNS w See 9x13x6cm.

with PC connector 0 2 digits Common cathode wuh red bezel £1.25 10-E10. TEXAS 19 gold platen snap key contacts pn gold plated P C board S 0e 70x80x2mm 75p ea 10 for E6. ORP12 hghl dependent resistance (Eq = RPY30)

10-- 21, 100 -Cal. IMOO-2350.

F

parts with instructions E5.50

JOYITICR CONTROLS. (Ideal for 1V Genes. model conl.01) eluld1, 100511uned compact peen lull 360 moremene end codr,1 Each um. Mad Port 11108 Isar. Wnllol. Pen 45.0e TAIRF LONG -MEDIUM S T/M TUNER WITH

CALCULATOR CHIPS General .nttrumeer IAMT4 on sea. data Inde 20 pre 0 I L melon lue .W wren Meaner *splay E1.EO TO. Pack or 25

TINA

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Ready -built

»pp., 0rde,

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T.V SOUND TUNER KIT Through your

tuner Kit

EE 100 97101u.[AS.

Tv pet

0 2 Red 0 125 Red

-

BOWMAR 9 DIGIT CALCULATOR DISPLAY

100

BC107/8-9

-

All below manufacturers' prices all new stocks. Quantity discounts export enquiries invited.

....NUB.

BARGAIN PACKS

IC+

0 2 Red Flat Sides

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PAYMENT TERMS: C W O Cheques Postal Orders Please Add 8% VAT After post & packing

WELCOME

19

E6 E6 E5

1

FREE

00

L

V

TRANSISTOR

VERSION 10 for £2 50 100 for £22 00 000 for £200.00 E2

A

CATALOGUE I

Ì

Carriage ,000 Lois

38 rocs one

£20.

HENRY" RA0/0

Y mall

:

Henry's Rado 404 Edgware Rd London W2 Pens 101) 723 1006

ELECTRONICS TODAY INTERNATIONAL

1-11

- NOVEVBER 1975

Readers' Circuits

CMOS Gate C.

Identifier PUSH TO TEST

i

Ching

P81

-

COMMON ANODE

330R

DISPLAY

This circuit can be used to distinguish four types of dual input gates is also

- quick methodNAND,checkingNOR

AND, OR,

it

IC of function. If an AND gate is inserted into the socket, an A appears on the LED. An 0 denotes an OR gate. The decimal point is used to denote inverted function, i.e. A is an NAND gate a

NOTE

01-3

ARE 8C109

Electronic Ignition Switch K. A. Last

R1

R3

10k

1k

LEDI START

1oV,50n RlA1 2P/co

5W 3

0-1.- TO

FUSE BOX

R4 2

I

PB100R

P814 FINISH

!SCR,

R12

50k R14

START

PB2IV

01

02

BOOR

5k6

CR2 R7 BOOR

R11

R13

ZD1

22k

200R

AIL 8V2

RESET

04 32k

R16

100R

`o SW2

R11

R20

R8

f

decodere

.K'.' 5TeemaaC-11! ws,*ä

-

atiibit e

rove,

e

international

Digital frequency readout module VMOS and pilot cancel £19.95

...DTI200 muting tex' wit, post decoder £2 75

zees oses

From the World's lending radio

COUNTER ATTRACTIONS: innovation source: prone.

vs.e sue- tepatio4c mee C New this month from Intersil, the ICM 7216. This is a ited I Inv 91esarr L._' for frequency counter/timer applications ever devised It 0' 31 ow D1L maz ens The cirque inputs of up to 10MHz minimum and operates on 'rim mrese.re 'sw-large Leading zero blanking Frequency ratio Period Ulm 'u7' 'me The IC cost is £19.82, and the 10MHz HC18U Xtal £2.5.0 rte' Tteal JOE circuit data is free with the IC, or £1 purchased separatey (emu Demme seen New from Ambit is the MC3357. 6v 2mA standby NB'ef F sesi=tor me ea with 10.7 - 455 kHz balanced mixer. onboard oscillator a ce era 54. anarnorm- 7 s -: .'rte T.l era. sideally suited to our CFM and LFY filter series, and =en

s,aar. H'0rn the MC3357, mentioned alongside, Ambit has the first easy -to -use low noise, o'. =st UHF dual gate MOSFET - the BF960 from Siemens. With a gain of 18dB, and a -Noise figure of only 2,8dB at 800MHz, you will see what we mean. At 200 MHz, the pun is 23dB, and NF only 1.6dB. Combine these figures with the famous ease of use of a no-ag gate MOSFET, and you have the easiest and most effective front end device yet.

Fwd'

£

`

that OSTS prices exclude VAT at 83: 7:-_-,_9-a.ambit items are at 12'5% except those marken ' -.ear n, although a single combined payment, and 25p r_s--- -.a,7 Please note

cD4000 [m05 4000

17p 17p 17p 109p 18p

4001

4002 4006 4007 4008 4009 4010

80p 58p 58p 17p 17p 55p

4011

4012 4013 4016 4018 4019 4020

I

4021

4022 4023 4024 4025 4026 4027 4028 4029 4030

I

4031

4032 4033 4034 4035 4036 4037 4038 4039 4040 4041

4042 4043 4044 4045 4046 4047 4048 4049 4050 41351

4052 4053 4054 4055

I

1

4059 4060 4063 4066 4067 4068 4069 4070 4071 4072 4073

80p 14276 80p 4077 60p 4078 4081 93p 4082 82p 4085 90p 17p 4086 76p 4089 175 17p 4093 4094 180p 4096 55p 4097 72p 4098 100e 58p I 4099 4160 250e 4161 100p 4162 145p 200p 1410.3 4174 120e 4175 250p 4194 100p 4501 105p 4502 2505 4503 83p 4506 90p 4507 85p 4508 85p 4510 80p 150p 4511 1304 4512

990 554 554 65p 650 65p 120p 1354

4513 4514 4515 4516

I

563p 14522 115p 4527 109p 4528 53p 4529 400p 4530 25p 4531 20p 4532 20p 14534 20p 4536 20p 4538 20p 4539

190p 105p

90p 905 90p 90p 104p 95p 95p 23p

_

Loa PriiCES

*Lei

7_

336c '-

2- -

I

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69p 51p

S

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Lap01AH LM30fAr. LM306N LM306M LM318H L.43+9er

1094

'LSW

13

7401

13 14 14 14 18 38 38 17 17 15 20 17 30

7402 7403 7404 7405 7406 7407 7408 7409 7410 7411

7412 7413 7414 7415 7416 7417

.420

51

-427 7428 '432

25

7433

40 40

'422 7423

'425

7426

17

'437

33 17 -441

74

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70 115 112 94 94 82 56

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24 24 24 24 24 52 130 24

17

17 17 17

24 24 24 27

29 32 24 24 32 24 24 24

7475 7476 7478 7480 7481

7482 7483A 7484 7485 7486 7489 7490 7491

7492 7493 7494 7495A 7496 7497 74100 74104 74105 74107 74109 74110 74111

99

99 99

74112 74113 74114 74116 74118 74119 74120 74121

74122 74123 74124 24 74125 24

35 17

85p

E3.87

I

28 28 32 27 38 37

74126 74128 74132 74133 74176 74138 3B 74139

40

74141 74142 741

7414 74145 74147 74148 74150

48 86 69 97 104

205 33 76

38 32 78

65 58 185 119 63 62 32 63 54 68 88

99 40

74151 74153

74154 90 :74155 74156 74157 74158 74159 99 74160

110 78 99 120

74161 74162 74163 74164 74165

198 83 119 115 25

74166 74167 74168 74169 74170 74172 74173 74174 74175 74176 74177 74180

46

74181

48

74182 74183 44 74184

38 38

38

38

313

KB4a0S 584412 -

6.5p

44

57 74 73

78 29 40 60

60 56 265 312 312 -

175 109 99 64 64 96 54 80 67

210 82 92 92 92

84 54 110 110 55 60 130 78 130 78

104 105 20

230 625 170 87 87 75 78 85 165 160 135

200 200

displays

reel

CA

1

Chokes

ebb3 red CC

7660 7663 7670 7673

yNlow CA yellow CC

233p

green CA amen CC

5082- 7730 red CA 5082- 7740 red CC 0 5" Fairchild FND500 red CC FND507 red CA

}147p 150p 150p

encé*;Ijstedin

pAll

'LSN' 74185 74188 74190 74191 74192 74193 74194 74195 74196 74197 74198 74199 74248 74251 74253 74257 74279 74283 74290 74295 74298 74258 74260 74365 74366 74367 74368 74375 74379 74399 74445 74447 74490 74668

134 275

92 180 180 187 137 110 110

NEF465

NE556 NE558 LM3909

1109000

& display E9.50

ICM7207 pulse IC I

clock E4.95

CM7208 -count

& display £14.95

ICL7106CP-LCD DVM IC

KIT,

£9.55 £24.80

LED DVM wnh ICL7107 £20,66

90 overspill 90 tA e remainder of the 105 Kr awns è not OSTS 108 V. snap diodes 52 V AT 12.5% 1120 e A102 30p 32p 90 s A121 30p '120 n -T210 40p 81058 e 100 45p 81046 5 110 200p .B131048 5 26 5e VAM2 14e6 49 VAM115 105p 49 IVAM125 105p 43 etching toe mox 25p 6 diodes 49 er diode 11%l 60 275p 130 K V1210

Ambit

IN switching 150 V AT 12.5% 92 8 A479 pin 35p 90 Ia1061 pi -network 140 aenuator 95p 110 8 A182 bandswitch

&

B8R3132A Bpole linear phase 10 7MHz

3.7s

MPX pilot tone filters for 19 & 38kHz

94 20 2 75 0 75 00 1

2

1

25

2 bal . mixers49c/polo'/Ooub cony am/fm/ss b del. ARC. NL, mute 255 3mV min processes p rearm 2 55 FM noise blankerayssem. K84423 Awlq preemM 81 .41,8 high gain/low IND LM381 0 99 LM1303 stereo audio optimized OA 1 95 high quality with alt option TDA1054 see above KB4417 Audio Power loam 1.19 TBABIOAS 7W RMS overload protected 1.95 TDA2002 8W/2S2 in pentawalt package 15W RMS hifi power dc coupled 2-96 TDA2020 1.80 10W higher voltage 810 TCA940 ULN2283 1W 2 5 to 12 v supply capability 1.00 LM380N8 1W power 1.00 100 LM380N14 25W power HiFi 15w in easy heatsink pack HA1370 299 Stereo Decoder Devices MC1310/KB4400 original pli decoder 220 CA3090AQ RCA's pli decoder 325 uA758 Buffered version of 1310 220 LM1307/uA707 non all type 55 HA1196 advanced adj sep pli low the 995 HA11223 newpilot cancel low the/imd 4 35 All ambit decoders are supplied with the LEO beacon of your choice Please state colour.

1

Pismo

semiconductors

Sons. of the biggest stocks of specialist MOS and FET transistors for radio in the UK 4310 55p' 40822 BF900 80p' 40673

40823 51p' MEM680 75p' BF256S 34p Most types for most RF circuitry, Inc new UHF T package types etc See price list

Hitachi VMOS 100W power darks Hitachi 2SK134 /2SJ48 100W comp VMOS. Data and circuit info £1, and the devices themselves for £14 00 a pair qua

17p 14p Yellow 20p 15e Green 20p 16p 29p/heL Orange 24p /he he high efficiency L= lens end

x

e

AMBIT 7In. the w.. value ... 5 dia 2.5dì0 Imml 2.5x5

eiRaU Found LED size RED

1410 1510

16p

17p

ode 3for

2110

150e

350 8429 dwide h y 100 n is ready (about to 150MHr 4.20p t o. wear 210 95HCODC 320M1.14 rand 45p to mom divide by ten J 804 . copy

BLR3107N Stereo 4k7 impedance Stereo 3k3 impedance BLR2007 Mono 4k7 impedance 8LR3152 Mono 4k7/3k0 imp BLR3157

250p 215g 220E 100p 100p

AM/FM/SSB IF FILTERS 2 4kHz se /455kHz carrier

l ,n l MFL series

É

Z222 9.

ä

5.

se

tail

Switch Systems- Check our combinations 4 very wide selection of 80TH Alps SU6

series units, (Schadow/AB/Oreor compatible) & the miniature Dialistat units Available in DIY systems for maximum flexibility and low cost.

And Finally

Further details of these, and many more of the wonders of the world of wireless in the 30p Poe lests for the new Ambit catalogue - with magazine supp78p next issue of the 180p c.11o,ue now calve lement 45p inc pp etc 72p Phone (0277).216029/227050 9am7pm -hooked' for den 400p patch immediately callers welcome anytime

MISCELL ENY 110

1.91

1

IICM7217 mum

105 105 105 95 99 85 150 160

120

1

1

-

16p 19p 33p

FM IF FILTERS ceramic and linear phase CFSE/SFE10 7 stereo ceramic IF 107MHz filters in 5 groups 50p 50p CFSB10 7 ono/roofing IF filter

1

0 50 2 55 2 75

KB4413 KB4417

-

Most El 2 values ex stock, any to order 7BA serres luH to 1mH BRB se 100uH to 33mH tORB series 33mH to 120mH

1.35 6 86'

ienqll9er

from 20p - 200MHz biggest range/biggest stocks

Ultra stable coils for 30

1

0.3" Standard HP

'LSN'

N'

es

7650

Srhottkli

LP

seg

synch AM demodulator precision 4 quad multiplier popular double balanced mixer

33p 80p

..

1.95 95 3 35 40 1.40

agc IF amp

I Communieeli9murcum

0.43" High Efficiency HP: 508250825082508250825082-

have used in our own laboratory tests edio heyvertey v 'noun oeNl4lot41 A1082 oCro VHF Root end gnem TDA1083/ULN2204 am/fm/audio In one IC TDA1090/ULN2242 am/fm hifi tuner system HA1197 LF/30MHz are receiver system CA3123E/uA720 LF/30MHz linear system TBA651 LF/30MHz linear system DMOS RF/Mixer pair SD6000 IIF amplifiers CA30139E/1484402 fnmaw FM II`-syMam HA1137W/K 4420 as 3099+ deviation mute update with deviation mute CA3189E TBA120a/SN76660N FM if and detector hi gain version TBA120 TBA1205

II MCI 350P IMC133OP MC1495L MC1496F

e19

3

cas

710PC 4.1 5914 723CN 870 741CH m5 tSp 68p edit 27o 21y 741CN 747CN 70o 97p 279, 748CN NE5311 i 2249 NE531N 1058

24

175p

.

SB, 710HC 105

'N'

7455 7460 7463 7470 7472 7473 7474

30 30 16 29 24 27 27 36 27 35

7421

20 20 20 20 24 26

l'

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EEC

yx

Wr907

125o

235e

-

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_.4- _.t3395

W198E

Another new range in 10mm

GMH, Ce«m,c IF sound Ih«r I...r .....moloeo ver colts tull catalogue top

..r__n__ m... Rob;

_

175p

F,LTERS FOR NOISE)RFI

c_-._-

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30c

C:.343E Cy34.3.-

300,

4521

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248p

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153c

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33p

Now two ranges of .mped.nc./coupImg ea 33p

(Only the very best quality - and only types

443-55

4569 4572 4580

£306 -x3C ;6r 5g,ncs

IIII.: II

10,Mit

Shon Wave Coils feu

Stock movement 200uA/7505-1.. The 930 series is 5% hnear. others are 77uA et 50% FSD These and many others evailabr4 in uuanlity fo OEM, SAE ter toil aale deraiN bee«. Mot in caLl

20

0151.07 na°mer LII1EAR5Y _V324N

91,p_

relative price stability, that some prices are increased as a direct result of the failure of £ versus stronger trading currencies. (Mainly Yen) 7 R lnmm IFT. in. AM/FM - hoot ac 455/470kHr moat typa of .ppcne 300

i

b`_ ti.ar-ruent vr_CE3G'.

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6.3. 232

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3990

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382,

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period of

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please note

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1100

4582 4583 4584

.

Coils & Filters by TOKO After

Ambit offers a very wide range of low cost meters, together with the unique 'Meter sea 7 era :,ate wrr_r. Made' scale system for professional grade v el scale customizing: me s:.: c = Ce.i.a Seale Area illnminatinn noes 2RdCES 900 14x31mm internal 12r 250p S LASH ED 920 30s50mm from behind 2764 930 36K63mm Internal tie 3750 940 twin 35x45mrn from behind 350p 4-1 950 55x45mm from behind 300p

63 rX-Y rE.-----5 _ _ -4

614p 3800

4581

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53:

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141P 125p

4562 4566

122p

1

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4561

372p 110p

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905 14543 20p 4549 20p 4553 20p 4554 20p 4556 82p 4557 82p 4558 150p 4559 50p 4560

rrr

60 each

Moving Coil Meters

1195p 195p MFH series 4/5/7kHz 8W on 455kHz 165p MFK series 7/9kHz BW on 455kHz LFY455D 12kHz 4 ele ladder on 455kHz 125p CFM2455 6kHz micro mechanical 65p 85p 0010 SFD455/470kHz murata SFD455/47UkHz murate IF filter r FT455R/C R/RkHa min + SIFT, 50e 86p CFW]0C ókHx on 4705Hx

Ratio Deunon for FM/N8FM 455kHz ratio der 1A651/7

KAN1508/9 10.7MHz ratio detector 94ACS15106/7 10.7MHz ratio detector

135p 66p 66p

Quadrature detectors for CA3089E etc single 33o KACSK586HM KAC53434213

double

FDlyterieon toning

esteem

660 +

trimmen

2A70577 71.265;,F AM C5222171 2x3354 AM 2429pF FM CV23217PX 2,3368F AM 3420pF FM 12 tnmmerel

950 1750

2450

Tuner Modules From the biggest and best range... TUNERHEADS for 88-108MHz band 2 (caricapl EF5803 EF5801 EF5600 EF5400

cct, 3 MOSFETs, amp. osc cet, 2 MOSFETs, osc op Sect, MOSFET RF, by TOKO 4oes balanced mixer/pin agc acct FET input miniature 6 6

19

75

1745 1495

975

8.25 TUNERSETS by LARSHOLT /head+IF) 26 50 Dual MOS head/low dist IF 7252 26 50 FET head, mpx decoder inc 7253 IF AMPLIFIERS all with deviation mute, agc, ak, merer 4nyer err HIOaIn dual canml,Îhhn 696 7020 10 95 Mos preamp, linear phase filter 7030 16.25 2 mos preamps, 3 Iptilters 7130 9.95 455/470kliz NBFM module NBFM1 '--n reed MYX decoders, alt worn pilot tone room buffer amplifiers for min 300mV RMS 6.95 1310 based system 92310 8.85 93090 3090 AO based system 1299 HA1196 based + birdy filter 91196 + + 91196B HA1196 based birdy filter 2 x LM380 audio monitor amps 16 45 12 50 HA11223 based system 911223 EC3302

AM RADIO The original MW/LW varicap 91197 11 85 tuner with electronic switch 13 22 9122 The unlband tuner module AM FM RADIO UNITS Using TDA1083, provides a complete 71083 MW/LW/FM portable radio chassis r. 75 for clock radio etc 71083D Drive/dial system for 71083 SPECIALS: TUNERHEADs in the range 40-200MHz to special order The EF5803 and EF5400 are available to cover bands in the region described The costs depend on quantity and actual mods required to cover the desired band. Max coverage approa 20% of centre frequency selected Also, please allow 3-5 weeks delivery for these items

Gresham Road, Brentwood, Essex. J

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SURREY YII U d ne IvP(2 in Ira Ier O15CWMC&Mae EIOlio, 51,1151' 201ess r`ü IS'. Veer E 100 10n 71, 5e nd SAE lorcomple a NI d telreoeane All prices INCLUDE overseas(. 10°-°.

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TOTAL AMPLIFICATION FROM WE NOW OFFER THE WIDEST RANGE OF SOUND PRODUCTS

CRIMSON ELEKTRIK

STEREO PRE -AMPLIFIERS

POWER SUPPLIES We produce sortable power supplies which use superb TOROIDAL Iransfr.rmers only 50mm 120-240 primary and single bolt fenny high with Includes capacitors/bridge

readier)

MC I

CPR

1

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TM suelel.nrne of tho Cnn , superb 40d1 ran touenem eon, .nun 0.501lewn6l telo r,.,-, .cling heavily mo,0,141W record. mu uida Common -mode d alon,n r. 1 - .Iry 71, fie ,eeulel. to 1c111 0.9141 to none rasa Comn-mode n 4 A Is is 70dß 060105 te 3.5enV. dunaehon Falowm0 ma alpe II Me Nat glen 'panne. 005'-o 30ds .0erlead 2001, alpe IO 61010 Doe. turtle etc. A e e,(owe, 5.0041 io noise ratio 8603 slew roe amp s0M1 levò 3V 114 0 2011e 205Hac 0080 as.ny leael F E T muting NO untult Ira Ilned intot n no prolneon to,u5.tole central, CPR 038.80. 201nm 11.1001, to b. 15 eons

POWER AMPLIFIER M GOULES CE608 60W/8 ohms 35.0 35v CE 1004 100W/4 ohms 35.0.3W CE 1008 100W,'8 ohms 454146. CE 1704 1 709/4 ohms 464-45v CE 1706170W/ß ohms 600.600

MC

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world be pnmtlaae IS he m ad Impel e .pane the .00,611 OI lecerdng Modena nu6Ls11ments ac who nave bwn 0406E CRIMSON edlCal10041 and peatnm Banos IO, 4064 40me Irma We 55 0110 000 10 the neaten quale at me 10411 prltee The peweesalsnasordy artlp n 41140451. In ewe tepee, nee on newea same 40ecdlgtmn T H D eyprdla .ever Me 01+4 anv poses/ 1114 S ohms T ID. wan 10,100. auo z 1018 l euency tnp0lne membrane Blew ras inn: 254 uS, 10H4-366114. -31,0. Iubiny any Nad ..1511. teminvliy 776mV unconpp01el Pei eenon del yea 1250mO of 100mV oli 1.anl61) In. 120 BO, TSmen

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mMub 40l

CRIMSON ELEKTRIK

2

C1.21 11(0.A amen

05.40

14 STAMFORD STREET, LEICESTER LEI 6NLL Tel (0633) 537722

ELECTRONICS TODAY INTERNATIONAL

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-

NOVEMBER 1978

Understanding Digital Electronics New teach -yourself courses DAP of

In the years ahead the products of digital electronics technology will play an important pan in your life. Calculators and digital watches are already

pi8kr fysíens Book

:-.

commonplace. Tomorrow a digital display could show your vehicle speed and petrol consumption; you could be calling people by entering their name into a telephone which would automatically look up their, number and dial it for you.

3

These courses were written by experts in electronics and learning systems so that you could teach yourself the theory and application of digital lo gic. Learning by self -instruction has the advent ages of being faster and more thorough than classroom learning. You work at your own pace and must respond by answering questions on each new piece of information before proceeding.

Design ci Syskons

....r.._

Book 6

cz

After completing these courses you will have broadened your career prospects and increased your fundamental understanding of the rapidly

6

.

changing technological world around you. The six volumes of Design of

Digital Systems cost only:

And the four volumes of Digital Computer Logic and Electronics cost only:

£8.10

a £4.60

-

£12.00

The contents of Design of Digital Systems include: Book 1 Octal, hexadecimal and binary number systems: conversine oetween number systems. representation of negative numbers complementary systems; binary multiplication and division. Book 2 OR and AND functions. logic gates. NOT, extustve OR. NANO, NOR and exclusive -NOR functions; multiple input gates: truth ables, De Morgans Laws; canonical forms; logic conventions:

MON Ceeputer red

Digit

l

ElL

ono

Computer

shown. All that students require is an aptitude for logical thought Size: A5, 130 pages This book is MUST for those with things to say

£2.95

Cambridge Learning Enterprises, Unit 12, Rivermill Site, Freepost, St Ives, Huntingdon, Cambs PE1 7 4BR

-

-

_-ws: design of logic circuits using NOR gates;

R -S

Dreary counters, shift registers and half adders.

and J -K flip flops;

CAMBRIDGE LEARNING ENTERPRISES, UNIT 12, RIVERMILL SITE, 11182POST. ST. IVES, HUNTINGDON, CAMBS. PE17 4BR, ENGLAND TELE PHONE: ST. IVES (0480)67446 PROPRIETORS: DRAYRIDGE LTD. REG - OFFICE RIVERMILL LODGE, ST. IVES REGD. IN ENGLAND Na 1328762

ELECTRONICS TODAY INTERNATIONAL

included

sets Design of Digital Systems @ £9 00, p. & p

is

xutive, scientist, student, engineer. Contents include: Binary, octal and decimal number systems;

-

NOVEMBER 1978

--

England Please send me the following books: - sets -Digital Computer Logic & Electronics @ £5 50, p & p

A

the student should have an aptitude for logical thought. It consists four rclumes each A4 size and serves as an introduction to the 2lect or oigitai electronics. Everyone can learn from it designer,

a

+ 45p post & packing by surface mail anywhere in the world. Airmail extra.

GUARANTEE If you are not entirely satisfied your money will be refunded -

-

extra

THE ALGORITHM WRITERS GUIDE explains how to define the questions, put them in t he best order and draw the flow chart, with numerous examples

vet.' Computer Logic and Electronics is designed for the beginner -athematical k"iiwvicuyc simple arithmetic assumed, i

- Airmail

safety procedures, government legislation, office procedures, teaching materials and computer programs by means of YES and NO answers to questions

Ers

-g

+£1 post & packing

HELP YOU PRESENT

I

1df1

-

Flow Charts & Algorithms.

.carnaugh mapping: three -state and wi.ed logic. Book 3 Half adders and full adders: subtractors; serial and parallel adders: processors and arithmetic logic units (ALUs); multiplication and division systems. B ook 4 Flip flops: shift registers: asynchronous and synchronous counters; ring, Johnson and exclusive-OR feedback counters: random access memories (RAMs) and read only memories (ROM s) B ook 5 Structure of calculators, keyboard encoding; decoding display ciata: register systems: control unit; program ROM: address decoding: -etruction sets; instruction decoding. control program structure. Book B Central processing unit (CPU); memory organisation, iaracter representation: program storage; address modes: input/

litrsds

&

packing

s.

Design of digital Systems is written for the engineer seeking to learn 'But if you buy both courses, more about digital electronics Its six volumes each A4 size are the total cost is only: packed with information, diagrams and questions designed to lead you step-by-step through number systems and Boolean algebra to Price includes surface mail anywhere in the world memories, counters and simple arithmetic circuits. and finally to a complete understanding of the design and operation of calculators anti computers.

-

+90p post

i

nrbtded

Name

Address

enclose a "cheque/PO payable to Cambridge Learning Enterprises for E I

Please charge my "Access/ Barclaycard/Visa /Eurocard Mastercharge/ interbank account number Signature, 'deleted as approonate Telephone orders from credit card holders accepted on 04.8 67446 (ansafone). Overseas customers should send a bank dra'sterling drawn on a London Bank. -

-

r

The latest kit

innovation!

GREENWEL

$01 OI-tX` Tel:[q71231 7 '?2501

All prices quoted include VAT. Add 25p UK/BFPO Postage. Most orders despatched on day of receipt. SAE with enquiries please. MINIMUM ORDER VALUE £1. Official orders accepted from schools, etc. (Minimum invoice charge £5). Export/Wholesale enquiries welcome. Wholesale list now available for bona -fide traders. Surplus components always wanted.

BUY A COMPLETE RANGE OF COMPONENTS AND TH ESE PACKS WILL HELP YOU *

* *

SAVE ON TIME -No delays in waiting for parts to come or shops to open! SAVE ON MONEY Bulk buying means lowest prices just compare with others! HAVE THE RIGHT PART No

--

guesswork necessary!

substitution

or

ALL PACKS CONTAIN FULL SPEC BRAND

-

NEW, MARKED DEVICES SENT BY RETURN OF POST VAT INCLUSIVE PRICES

K001 50V ceramic plate capacitors, 5% 10 of each value 22pF to 1000pF Total 210,

£3.35 K002 Extended range, 22pF to 0 l p F 330 values £4.90 K003 Polyester capacitors, 10 each of these

the quickest fitting

CLIP ON

values 0 01, 0 015, 0 022, 0 033, 0 047,

0068, 01, 015, 022, 033, 047uF 110 altogether for £4.75

capacitive discharge electronic ignition

K004 Mylar capacitors, min 100V type 10 each all values from 1000pF to 10,000pF Total 30 for £3.75 K009. Extended mylar pack Contains all values from 1000pF to 0 471, F Total 290 capacitors to £11.25 K005 Polystyrene capacitors, 10 each value from 10pF to 10,000pF, E12 Series 5% 160V Total 370 for £12.30 K006 Tantalum bead capacitors 10 each of the following 0 1. 0 1 5, 0 22, 0 33, 0 47, 0 68, 1, 2 2, 3 3, 4 7, 6 8, all 35V; 1

in KIT FORM Smoother running Instant all-weather starting

7/

Continual peak performance Longer coil/battery/plug life Improved acceleration/top speeds Optimum fuel consumption

10/25, 15/16 22/16 33/10 47/6

100/3

Total 170 tants for £14.20 K007 Electrolytic capacitors 25V working,

small physical size 10 each of these popular values 1, 2 2, 4 7, 10, 22, 47, 100p F Total 70 for £3.50

K008 Extended range,

as above, also including 220, 470 and 1000µ F Total 100 for £5.90 K021 Miniature carbon film 5% resistors, CR25 or similar 10 of each value from 1OR to 1M, E12 series Total 610 resistors

Sparkrite X9 is a high performance, high quality capacitive discharge, electronic ignition system in kit form. Tried, tested, proven, reliable and complete. It can be assembled in two or three hours and fitted in / 3 mies. Became ut tire superb design 01 re Sparest, circuit it completely eliminates problems o1 the contact breaker There is no mist,. due to contact breaker bounce which u eliminated electronically by a pulse suppression circuit which prevents the unit bring it the points bounce open at high R P M Contact brea ker nurn is eliminated by reducing the current to about t .50th of the norm. Il will perform equally well with new, old, or even badly pitted points and is not dependent upon the dwell time of the contact breakers for recharging the system Sparkrite incorporates a short circuit protected inverter which eliminates the Problems or SCR lock on and, therefor,. e liminates the possibility of blowrng the transistors or the SCR. Most capacitryedi scharge gobions we not compete ly foolproof in this respect) The circuit moor porates a voltage regulated output for greatly improved cold starting The Cucuit includes built In static teeing light. systems function light, and Security chang cover sw itch All kits 1,1 sehgles ed ith co stributor ignition up to 8 cylmdert 1

£ 6.00

K022 Extended range, total 850 resistors from 1R to 0M £8.30 K041 Zener diodes, 400mW 5% 8ZY88 1

etc 10 of each value from 27V to 36V, E24 series Total 280 for £15.30 K042 As above but 5 of each value £8.70

I

STEREO AMPLIFIER

CHASSIS £5.50

Complete and ready built Controls Bass, treble volume/on-off, balance 8 transistor circuit gives 2 watts per channel output Just needs transformer and speakers for low cost stereo amp Suitable filet al cabinet (W374) £2.00 or buy the am p, case and transformer for E10,00 and get DIN speaker lockets and knobs I reed

i

THE KIT COMPRISES EVERYTHING NEEDED Die pressed epo ry coated case Ready drilled. aluminium eat coed

rrx an d heat

sink, coil mount mg clips and accessories. Top quality 5 year guaranteed transformer and components. cables. connectors. P.0-8 huts. godsend silicon grease. Full instructions to assemble kit neg or pos earth and fully illustrated installation instructions.

-

AMPLIFIER KIT £1.75

NOTE-Vehicles with current impulse tachometers (Smiths code on dial ßV will require a tachometer pulse slave unit Price £3 35 inc VAT post & packing 1

Mono gen purpose amp with tone and vol /on -off controls Utilizes sim circuitry to above amp Output 2Winto 8 ohms Input matched for crystal cartridge 4 transistor

,

circuit

Fct0c Bath Street. Walsall. WS1 3DE s

Design Associates. Dept.

Simple to build on PCB provided Can be either battery or mains operated (Fur

mains powered version add £2.20 for suitable transformer) Blue vinyl covered aluminium case to suit (W372) £1.30.

ET 10

Phone. (9) 614791

Name

1 1

Special Offer for quantity users. 1k .035 + VAT, 5k .032 + VAT Price negotiable on 10k + approx 80k available

Phone your order with Access or Barclaycard VAT

QUANTITY REUT) REIN

and PP

K4 KIT

Send SAE If 51005$s

tie

endear OequePO's toi

£14.95

TACHS PULSE SLAVE UNIT

L. 100

BC182B OFFER

Address

Inc

£3.35 Cheque eque ND

D

443 Milarook Fined Southampton

PC ETCHING

matt

1

KIT MK III

Now contains 200 sq ins copper clad board, 1lb Ferric Chloride, DALO etch -resist pen, abrasive cleaner, two miniature drill bits, etching dish and instructions £4.25.

EDGE CONNECTORS

Special purchase of these 0 pitch double -sided gold-plated connectors enables us to offer them at less than one-third of their original list price' 18 way 41p; 21 way 47p; 32 way 72p; 40 way 90p. 1

11111

THE NEW 1978-9 GREENWELD CATALOGUE FEATURES INCLUDE: * 50p Discount Vouchers * Quantity prices for bulk buyers * Bargain List Supplement

*

Reply Paid Envelope Priority Order Form VAT inclusive prices Price 30p+1 5p Post

* *

HEAT SINK OFFER

Copper TO5 sink 7mm dia x 20mm 10 for 40p; 100 for£3; 1,000 for £25. 1

74 SERIES PACK

Selection of boards containing many different 74 series ICs 20 for £1; 50 for £2.20; 100 for £4.

TMS4030 RAM

4096 bit dynamic RAM with 300ns access time; 470ns cycle nine, sing le low capacitance high level clo ck is p Ful ly TTL compatible; Low power d isslpation Supplied with data £2.75.

MISCELLANEOUS ICs

Supplied with data if requested MC3302 quad comp. 120p; 710 diff comp (T099)

40p; ZN1034E precision timer £2.25; LM 711 Dual diff comp 65p; LM1303 dual stereo pre -amp 75p; MC1469R voltage reg

£1.50; UPC1025H audio £3.50; 575C2 audio £2.88; TDA2640 audio £2.92; TBA810S audio 70p; SN75110 dual line driver 70p; MC8500 CRCC gen POA

EXPERIMENTERS CALCULATOR

Based on the C500 chip, this pack of parts

enables the more experienced constructor to make an 8 digit 4 function calculator The comprehensive data supplied includes fullsize layout of PCB required, types of suitable display and keyboard that can be used etc Components included in the pack are C500 calculator chip, driver IC all components for inverter/clock circuits, Rs Cs etc All for only

£3.50.

RELAYS

W847 Low profile

PC mntg 10 x 33 x 20mm 6V coil, SPCO 3A contacts 93p. WB32 Sub min type, 10 x 19 x 10mm 12V coil DPCO 2A contacts £1.15 W701 6V SPCO 1A contacts 20 z 30 x

25mm Only 56p. W817 11 pin plug in relay; rated 24V AC, but works well on 6V DC Contacts 3 pole c/o rated 10A 95p. W819 12V 125OR DPCO lA contacts Size 29 x 22, lime. ,Til, plug w type 72 P. W83 R 50V ac (24V !Xi coil 11 pin plug -in type 3 pole c/ o 10A COolaCts Only B 5p. W 84 O Open COnflruCtidn malns relay. 3 sets 1OA ,_ o contacts. (1.20. Send SAE for our relay list 84 types listed and illustrated 1

-

LOW COST PLASTIC BOXES Made

in high impact ABS The lids are retained by 4 screws into brass inserts Interior of box has PCB guide slots (except

V219). V210 80x62x4Omm black V213 100x75x40mm black V216 20x100x45mm black V219 120x100x45mm white

58p 72p 86p 86p

1

SPECIAL SUMMER OFFERS Audio £1.40 £1.00 80p

76003N 76023N LM380

ICs

76013N 76033N TBA810S

£1.00 £1.40 90p

Linear ICs etc. 18p BD131 25p BD132 2p 2N3819

741(8DIL) 555

1N4148

24p 28p 18p

DIODE SCOOP!!!

We ha vo been lonunata to obtain a

la

rge

quantit y of untested ngspy unmarked gi ass silicon diodes teeing a sample be tch reveale d about 70% iaeable devices signal diodes, high voltage rets and zeners may all be included. These are being offered at the incredibly low price of £1.25/1,000

-

or a bag of 2,500 for 10 000 £8. Box of 25,000

100,000 £60.

ELECTRONICS TODAY INTERNATIONAL

£2.25. Bag of £17.50. Box of

- NOVEMBER 1978

Buying Guide

ECTRWKLEEE

Section 5

Practical Electronics and Everyday Electronics, so that the complete senile will be available e ach month. In this way, no matter which pu mals you read, BY DETACHING AND SAVING THESE PAGES, YOU WILL HAVE A VALUABLE AN D COMPREHENSIVE MONEY SAVING CATALOGUE. Next month Section One.

have bought front us before, you will knew lust how large varied our stocks ere. For those who have yet to know, we publishing a series of five edvertisem ants month by month to up to date information end prices on the most Important we carry. These advertisements will appear in slapped E.T.L. Elektor. Practical Wireless, ion in five journals

tapped at 12, 15 20, 24V GP501 50V lA tapped 19,25,33,40V GP502 50V 2A tapped 19,25,33,40V GP601 60V lA tapped 24,30,40,48V GP602 50V 2A tapped 24,30,40,48V 50TS 50V 2A tapped 25,45V Pri/sec shield

8pN (4.7511 £4.7511 £4.7511 £4.7511

E2.35N

£4.60 £4.30 £6.30 £4.60 £6.70

1

1

CT1 17V 1A charger duty tapped £2.95 9V CT2 1 7V 2A charger duty tapped £3.25 at 9V CT4 17V 4A charger duty £3.85 £2.45 5A FT1 6 3V £2.30 GP12 12V 1 5A

Miniature

LT700

1

K2

C T

Sec

3

2n

39p

1

£6.55

stub

E1.90N E1.90N

lead for HMS (5.7011 £5.7011 Solder Kn In presentee.

MEIN

oder kit m wallet

£7.5011

=IPES IIIS ,, a!!

it

ranges free on

1

U X. aver f5 list _c_ 27p handling

--T_

DISCOUNTS on

list - __- where where list =

i 45 B14

MATERIALS COPPER CLAD BOARD 300 1

MINIATURE CONTINENTAL x

50mm

Single Sided SR BP 85p; Fibreglass Double sided SRBP

REED RELAYS

RELAYS

PRINTED CIRCUIT

£1.65 £1.00

UNCLAD SRBP 300 x 150mm 56p FERRIC CHLORIDE, Lab grade 100gm pack 47p; 500gm jar £2.30 POSITI V-20 Aerosol, 75cc with instructions £1.30 ETCH RESIST PEN Decon with spare tip 85p 73 00 63 00 SILVER CONDUCTIVE PAINT 3gm vial Elecolit 340

TYPE Type R42 12V 185n 2 C/0£1.80 Type R44 12V 185n 4 C/0£2.00 97p PC socket type P40 88p Ordinary wiring skt W40 Mounting strip 6 posn R40 26p

PIGMY MAINS RELAY

3

C/0

10 amp 6V 29n, 12V 110n, 24V

475n all d

each £2.30

c

240V

a c

8200n coil

£2.55

ay- xs:-uction

5V 106n CSAE

a

909

12V 645n CSA'2s^ce- c90p 5V 57n CDA5 do..c;e ^ c £1.28 2V320n CDA '2 oc .b -e r o 1

£1.19

REED RELAYS e_-oosed type LPS1 2 sing''e

LP01

2

590^

double 355,

98p £1.32

LATCHING RELAYS enclosed n

o

CLAS 5V =00^ CLA12 12', 225-

MEET US AT BREADBOARD 78

S'412

£2.30 £2.30

3

£1.92£1.68 £2.20

NEW

99aWA m9

mN ,.AOn

m

0< p JJ 9 D

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en

9

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m Ui

9999

o

*V.A.T.-

8% to value of order

For items marked ', add 121/2%

*FOR ACCESS OR BARCLAYCARD orders, just phone or write your number.

No discounts allowable on prices marked Net or N

N

n

mm

Ó

D

G

a c

56p 61p

SP

Sub -Miniature 250V 2A

64p 77p

577

11

a c

25"

63p 84p

011 SPDO T

57201 DPDT S7203 DPDT

84p

centre -off

S7205 DPDT sideebiased

£1.20

DPDT biased one side

£1.51

S7207ach

57211 SP 3 -way S7301 3PDT 57401 4PDT

E7.100

£1.42 £1.80

MICROSWITCHES SPDT 55001 button, lever or roller 85p TIME SWITCHES (Smith's) For electrical use, 13A rating IMERSET for wired -in situations, 2 on & 2 off actions per day £11.60N

AUTOSET 13A socket outlet

TEAR OUT AND TAKE GOOD CARE OF THIS PAGE AND REMEMBER TO LOOK OUT FOR NEXT MONTH S ADVERTISEMENT TO ADD TO IT OUR COMPUTER -AIDED SERVICE TAKES GOOD CARE OF YOUR ORDER NO MATTER HOW LARGE OR

-'-e MERCHANDISE

ÿm

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5A

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Otherwise as Imerset

SENT POST FREE

f Ó9j» Orn.4229Ó

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99 =pp

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TOGGLE 250V Chrome finish 1011C SPST 1016C SPDT 1019C SPDT centre -off

409 DPDT

SOpN

80pN 80pN

gpd 9999Hp8?N9m mW,maZWnn90 m n

ó 902

tra^sfor-,-

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Pri

SQWFWW.W.y" a x

GP302 30V 2A

£1.00 £1.40 £1.00 £2.10 5A 9-0-9V 0 GP909 12012/1 12-0-12V 50mA E1 00 100m.4 £1.20 12-0-12V 1200 MT15012V 12V 150-A£1.70 1A £3.20 15-0-15V 151A GP202 20-0-20V 0 754 £2.30 1A £3.80 301A 30-0-30V

606/1 6-0-6V 100mA MT280 6V,6V, 250mA 909/1 9-0-9V 75mA

97sp=99p999

50TS2A

50TS2A 50V 2A (110/120V pri) tapped 25,45V £6.55 Pri/sec shield 28705 12V, 12V,2 -0-2V 0 5A £ 3.85 2871 12V,12V,2-0-2V 1A £4.90 2872 2V, 2V, 2-0-2V 2A £5.30 12T05 6V,6V,0 5A (Split primary 120, 120V) £3.30

x

£1.50N

OWOO

r71

FOR DELIVERY FROM STOCK NETT PRICES FROM £197.50 + V.A.T.

TRANSFORMERS All mains transformer primaries suitable for 240V input except for

£3.6011

£1.5021

..t
PQdm QQNO-NämF>- Z vTN '0W

E2.30111

32 -way

121

»0

£2.3016

H2 75

100

»