| | VOLUME 17 No. 1 JANUARY 1981
CONSTRUCTIONAL PROJECTS
PE MASTER RHYTHM Part 2 by A.J. Boothman BSc. .. 22
Instrumentation board and final setting up
PE STARSPINNERPart 1 .. .. .. .. .. .. .. 30
A matrixing lighting system with 64 different effects
LINEAR OHMMETER by D. H. E. King .. .. .. .. .. .. .. .. 36
A six range instrument with l.e.d. display
INTERFACING COMPUKIT Part 1 by D.E. Graham .. .. .. .. .. .. .. 44
Introduction, leading to full construction of a universal interface board
PE MICROTUNE Part 2 by MartinKent .. .. .. .. .. .. .. .. 50
Use this when you tweak-keep your car at its peak
DISCO DESK Part 5 by Ben J. Duncan .. .. .. .. .. .. .. 60
Final wiring and testing
GENERAL FEATURES
S0LAR POWER SATELLITES by Dr. J P. Stark .. .. .. .. .. .. .. 38
Will solar power solve our energy problems?
SEMICONDUCTOR UPDATE byR. W. Coles .. .. .. .. .. .. .. 49
TMOS UTN2886B TMS5100 TMS6100
UK1O1 GRAPH PLOT by Toby Walsh .. .. .. .. .. .. .. 66
Ideal mathematics teaching aid, in BASIC
MICROPROMPT .. .. .. .. .. .. .. .. .. .. .. 68
Hardware and software exchange point for PE computer projects
INGENUITY UNLIMITED .. .. .. .. .. .. .. .. .. 70
Model Train Controller-Timer for Cine Camera-Torpedo Game-TTL Protection-6V Regulated Supply-Fuse Failure Indicator
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. .. .. 17
MARKET PLACE .. .. .. .. .. .. .. .. .. 18
New Products
INDUSTRY NOTEBOOK by Nexus .. .. .. .. .. .. .. .. 21
Moral of the Metro
BOOK REVIEW .. .. .. .. .. .. .. .. .. .. .. 28
SPECIAL OFFER: IN CAR ENTERTAINMENT .. .. .. .. .. .. .. 34
Quality products at unbelievable prices
READOUT .. .. .. .. .. .. .. .. .. .. 42
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. 59
Pluto-The Rings of Saturn-The Soviet Cosmonauts
PATENTS REVIEW .. .. .. .. .. .. .. .. .. .. 69 PE Joanna gets a Patent
OUR FEBRUARY ISSUE WILL BE ON SALE FRIDAY, 9 JANUARY 1981
(for details of contents see page 29)
VOLUME 17 No. 2 FEBRUARY 1981
CONSTRUCTIONAL PROJECTS
ELAPSED HOUR METER by ChrisLare . .. .. .. .. 18
An accumulative counter measuring up to 9990 hours
SLAVE LIGHT DIMMER by Gilbert Davies .. .. .. .. .. .. .. 26
Lighting control unit
DIGITAL COUNTER TIMER Part 1 by Dr. Mark Sawiki and Alex Kowalewski BSc . .. .. 32
An eight digit universal counter/timer
PE STARSPINNER Part2 .. .. .. .. .. .. .. .. .. 42
Construction and setting up
PE MAGNUM MODIFICATIONS by Andy Flind .. .. .. .. .. .. 52
Some useful updating for this popular project
INTERFACING COMPUKIT Part 2 by D. E. Graham .. .. .. .. .. .. 54
Decoding Module design
GENERAL FEATURES
TANDY TRS8O Reviewed by Dr. A. A. Berk .. .. .. .. .. .. .. 28
A detailed look at Tandys pocket computer
SEMICONDUCTOR UPDATE by R. W. Coles .. .. . .. .. .. .. 41
AM2960, HLMP31XX, HMP36XX
MICROBUS by D.J.D. .. .. .. .. .. .. .. .. 48
Software for the MK14, ZX8O and Acorn System One
INGENUITY UNLIMITED .. .. .. .. .. .. .. .. 64
Capacitive Touch Switch
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. 15
MARKETPLACE .. .. .. .. .. .. .. .. .. 16
New products
READOUT . .. .. .. .. .. .. .. .. .. .. 22
There's a computer club near you
INDUSTRY NOTEBOOK by Nexus 24
An optimistic look ahead
SPECIAL OFFER-TELEQUIPMENT 561 OSCILLOSCOPE .. .. .. .. .. 25
An essential piece of test equipment for the serious constructor
POINTS ARISING .. .. .. .. .. .. .. .. .. 30
PE DMM, 125W Amplifier, Interfacing Compukit
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. 63
The continuing saga of Saturn
PATENTS REVIEW 66
More thought-provoking ideas
OUR MARCH ISSUE WILL BE ON SALE FRIDAY, 13 FEBRUARY 1981
(for details of contents see page 31)
VOLUME 17 No. 3 MARCH 1981
CONSTRUCTIONAL PROJECTS
27/28MHz CONVERTER by M. Tooley BA .. 30
Modifies your radio for 27/28MHz listening
PERIOD POWER TESTER by Chris Lare .. .. .. 38
Variable switching for surge testing equipment
MICROPHONE MIXER by R.A.Penfold .. .. .. .. 46
Three microphone stereo mixer
INTERFACING COMPUKIT Part 3 byD. E. Graham .. .. .. .. .. 52
Display Board
DIGITAL COUNTER TIMER Part 2 by Dr Mark Sawicki and Alex Kowalewski BSc 66 Construction and p.c.b.s (conclusion)
GENERAL FEATURES
AUDIO LINES by Ben Duncan . . 22
Dealing with problems associated with audio transmissions
CEGMON Reviewed by Mike Abbott 26
An updated monitor
SEMICONDUCTOR UPDATE by R. W. Coles .. .. .. .. .. .. 36
SG1547 TDC1O23J 1NS8073
STRICTLY INSTRUMENTAL by K. Lenton Smith .. .. .. .. 44
When is an organ not an organ?
INGENUITY UNLIMITED .. .. .. .. .. .. .. 62
Pip Generator-Graph Display Unit-Storm Distance Estimator-Binary to BCD Converter-
Traffic Lights
MICROPROMPT .. .. .. .. .. .. .. .. .. 69
Hardware geometry, plus software for pleasure and debugging
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. .. .. 17
MARKET PLACE .. .. .. .. 18
New products
INDUSTRY NOTEBOOK by Nexus 21
The Electronics industry stays on top
NEWS BRIEFS .. .. .. .. .. .. .. 24,45,61
SPECIAL OFFER-TELEQUIPMENT 561 OSCILLOSCOPE .. .. .. 37
READOUT .. .. .. .. .. .. .. .. .. .. 42
Some feedback on the sensitive subject of CB
PE INVENTORS COMPETITION RESULTS .. .. .. .. .. .. .. 43
An intriguing follow-up
COUNTDOWN .. .. .. .. .. .. .. .. .. 45
What to see: where and when to see it
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. .. 51
After the pass-The Secret of Venus
PATENTS REVIEW .. .. .. .. .. .. .. .. .. .. 60
3-D Viewing
POINTS ARISIIG .. .. .. .. .. .. .. .. .. .. 61
PE Teletext
OUR APRIL ISSUE WILL BE ON SALE FRIDAY, 13 MARCH 1981
(for details of contents see page 29)
VOLUME 17 No. 4 APRIL 1981
CONSTRUCTIONAL PROJECTS
PE DIGISOUNDER Part I bysrian Currie 30
Digital depth sounder for boats
SPEECH PROCESSOR by Michael Tooley BA and David Whitfield BA, MSc .. 38
Improves the intelligibility of voice signals
DRILL PSU by Chris Lare . . .44
Includes a p.w.m. controller for variable speed capability
ULTRASONIC INTRUDER ALARM by Gilbert Davies .. 52
Updated protection system
INTERFACING COMPUKIT Part 4 by D. E. Graham .. .. 56
Analogue board-construction and theory
GENERAL FEATURES CONSUMER ELECTRONICS SHOW 22
Latest developments are seen at Las Vegas
OSCILLOSCOPES - HOW THEY WORK Part 1 by IanHickman .. .. 26
The cathode-ray tube
SEMICONDUCTOR UPDATE by R. W. Coles 49
ICM 7242 L290, 1&2 4118, 4801 &4802
MICROBUS by DJD . .. .. 50
Program loader and other software for ZX8O, plus 3-D plotting for Acorn Atom
INGENUITY UNLIMITED .. 66
'Day to Remember' clock-Bargraph Thermometer-L.F. Analogue Monitor-Envelope Differentiator-Synth Processor-TVC for Synths
NEWS AND COMMENT
EDITORIAL .. 17
MARKETPLACE .. 18
New Products
INDUSTRY NOTEBOOK by Nexus 21
The painful implementation of new technology
SPACEWATCH by Frank W. Hyde .. .. 35
Prospects for the next decade
COUNTDOWN 42
What to see; where and when to see it
POINTS ARISING .. .. .. .. 42
27/28MHz Converter, Microbus
READOUT .. 63
A bumper batch of readers' opinions, including more views on CB
PATENTS REVIEW 65
Pulse rate loggers for overweight joggers
OUR MAY ISSUE WILL BE ON SALE FRIDAY, 10 APRIL 1981
(for details of contents see page 36)
VOLUME 17 No. 5 MAY 1981
CONSTRUCTIONAL PROJECTS
DIGITALLOCK by Bart Trepak .. .. .. .. .. .. 22
Keyless lock alternatives with over 5000 combinations
DIGITAL THERMOMETER by Martin Kent .. .. .. .. .. 36
An easy-build project of high accuracy and reliability
DIGITAL MULTIMETER by Martin Kent .. .. .. .. .. .. 44
Twenty-one ranges and six functions
PE DIGISOUNDER Part 2 by Brian Currie .. .. .. .. .. .. 48
Construction, calibration and fitting
COURTESY LIGHT DELAY by Phillip Dakin .. .. .. .. .. 54
Car interior light delay with ignition inhibit
INTERFACING COMPUKIT Part 5 byD. E. Graham .. .. .. .. .. .. 60
Programmable sound generator
GENERAL FEATURES
SEMICONDUCTOR UPDATE by R. W.Coles .. .. .. .. .. 26
TMS9909 SABO600 AD636
DIGITAL PANEL METER-CIRCUITRY AND APPLICATIONS by Martin Kent .. .. 32
Module operation and connection notes
OSCILLOSCOPES - HOW THEY WORK Part 2 by Ian Hickman .. .. .. .. 39
Circuitry
600 BAUD CASSETTE INTERFACE by P. Martin .. .. .. .. 56
Speedier data and program storage for UK 101
MICROPROMPT .. .. .. .. .. .. 57
Exchange of software and ideas
INGENUITY UNLIMITED .. .. .. .. .. .. .. 66
Boat Horn-Thump Eliminator-Push Button Pulse Generator-Live Circuit Tester-Disco Light Sequencer-Delayed Output Protected Mono
NEWS AND COMMENT
EDITORIAL .. .. . .. .. .. .. .. .. .. .. 17
MARKETPLACE .. .. .. .. . .. .. .. .. .. 18
New Products
INDUSTRY NOTEBOOK by Nexus 21
Working wonders in Wales
NEWS BRIEFS .. .. .. .. .. .. .. .. .. 25
POINTS ARISING .. .. .. . . .. .. .. .. 25
Digital Counter Timer
FREE CASE .. .. .. .. .. .. .. .. .. .. .. 30
Projects ... Extras... Competition
COUNTDOWN .. .. .. .. .. .. .. .. .. .. 31
READOUT .. .. .. .. .. .. .. .. .. .. .. 34
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. 35
SPECIAL OFFER-DIGITAL PANEL METER .. .. .. .. .. .. .. 51
Use it with our free case
PATENTS REVIEW .. .. .. .. .. .. .. .. .. .. 53
OUR JUNE ISSUE WILL BE ON SALE FRIDAY, 8 MAY 1981
(for details of contents see page 29)
VOLUME 17 No. 6 JUNE 1981
CONSTRUCTIONAL PROJECTS
PE MINITUNE by Martin Kent .. .. .. .. .. .. .. .. 34
For r.p.m., dwell, voltage and resistance testing
pH METER by Martin Kent . . . . .. . . . . . . . . . 40
Provides an accurate measurement of pH values in the range O-14pH
SEMICONDUCTOR CURVE TRACER by D. Mandelzweig .. .. .. .. .. 5O
Transistor and diode characteristics displayed on your scope
CONTINUITY TESTER by Martin Kent .. .. .. .. .. .. .. 64
Provides resistance measurements in the range 0.1 Ohm-20M
INTERFACING COMPUKIT Part 6 by 0. E. Graham .. .. .. .. .. .. 68
Manipulating the VIA
GENERAL FEATURES
WIRE WRAPPING by John Lewis .. .. .. .. .. .. .. .. 24
An introduction to a simple and effective form of wiring
WEMON REVIEWED by Dr A. A. Berk .. .. .. .. .. .. .. 26
Another UK1Ol/Superboard monitor looked at
SEMICONDUCTOR UPDATE by A. W. Coles .. .. .. .. .. .. 31
CY500 LM330
STRICTLY INSTRUMENTAL by K. Lenton-Smith .. .. .. .. .. .. 38
The history of a pioneer in the organ world
OSCILLOSCOPES - HOW THEY WORK Part 3 by Ian Hickman .. .. .. .. 45
Circuitry
POSITIVE IMPEDANCE CONVERTORS by A. B. Bradshaw .. .. .. .. .. 58
The use of gyrators in the design of filters
MICROBUS By D. J.D. .. .. .. .. .. .. .. .. .. 76
Acorn Atom games, dynamic ZX8O graphics
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. .. .. 17
NEWS & MARKET PLACE .. .. .. .. .. .. .. .. 18
Including Countdown and Points Arising
INDUSTRY NOTEBOOK by Nexus .. .. .. .. .. .. .. .. 23
Triumphing over the recession
EXTRA CASE COUPON .. .. .. .. .. .. .. .. .. 28
To save you money on another case
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. 32
Keeping you up to date with extra-terrestrial activity
SPECIAL OFFER-CAR AUDIO BOOSTER .. .. .. .. .. .. 39
Yet another unrepeatable bargain
READOUT .. .. .. .. .. .. .. .. .. .. .. 44,79
Criticism of the controversial
SPECIAL OFFER-DIGITAL PANEL METER .. .. .. .. .. .. .. 57
Use it with our free case
PATENTS REVIEW .. .. .. .. .. .. .. .. .. .. 78
A 7in. cube that delivers 500 watts of audio power!
OUR JULY ISSUE WILL BE ON SALE FRIDAY, 12 JUNE 1981
(for details of contents see page 33)
VOLUME 17 No. 7 JULY 1981
CONSTRUCTIONAL PROJECTS
PE QUASAR .. .. .. 26
Stereo AM/FM Tuner
CAPACITANCE METER by Martin Kent .. .. .. 34
Ranges from 1pF to 20µF
LIGHT METER by Martin Kent .. .. .. 46
A general purpose instrument with applications in photography, chemistry, medicine and pollution control
NOISE METER byMartin Kent .. .. 5O
Indicates ambient noise levels in the range 60-110dB
INTERFACING COMPUKIT Part 7 byD. E. Graham .. .. .. 62
Conclusion
GENERAL FEATURES
COMMUNICATION BY FIBRE OPTICS by Gary Gardner .. .. .. .. 38
A bright future for telephones and TV
SEMICONDUCTOR UPDATE by R. W. Coles .. .. .. .. .. .. .. 42
Featuring iAPX432 U41OB
MICROPROMPT .. .. .. .. .. .. .. .. .. 54
Cream of idea soup
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. 17
NEWS & MARKET PLACE .. .. .. .. .. .. .. .. 18
Including Countdown and Points Arising
INDUSTRY NOTEBOOK by Nexus 23
Slimming for health
CB PROPOSALS 24
The low-down from the Home 0ffice
SPECIAL OFFER - DIGITAL PANEL METER .. .. .. .. .. .. 45
For use with all our free case projects
EXTRA CASE COUPON 57
To save you money on another case
PATENTS REVIEW .. .. .. .. 58
We look at the second of the controversial Carver ideas
READOUT .. .. .. .. .. .. .. 59
American advice
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. 61
Our resident stargazer celebrates a bi-centenary and the success of the Space Shuttle
SPECIAL 12 PAGE SUPPLEMENT
CIRCUITS SUPPLEMENT 22
designs of diverse appeal (between pages 42 & 43)
OUR AUGUST ISSUE WILL BE ON SALE FRIDAY, 10 JULY 1981
(for details of contents see page 43)
VOLUME 17 No. 8 AUGUST 1981
CONSTRUCTIONAL PROJECTS
AUDIO ANALYSER Part 1 by Michael Tooley BA. and David Whitfield BA., M.Sc. 24
For the measurement and display of audio signals
TRAIN CONTROLLER by AndyFlind 32
Ensures realistic starting, acceleration and braking
ECHO SIMULATOR by S.J. Musgrave .. 38
Test set for echo sounders
MINUTE CHIMER by James S. S. Dick 52
A displayless timer for up to fifteen minutes
EPROM PROGRAMMER by J. Dyson .. 60
Single-supply EPROMS programmed by Compukit
GENERAL FEATURES
UK101 COLOUR BOARD REVIEW by Mike Abbott 30
Why see things in black and white
SEMICONDUCTOR UPDATE by R. W. Coles .. .. .. .. .. .. .. 37
MM5439 ZN470 M04101
DIGITAL DESIGN TECHNIQUES Part 1 by Tom Gaskell BA . .. .. .. .. .. 42
Introduction to Logic
MICROBUS by D. J. D. .. .. .. .. .. .. .. .. .. .. .. 56
Clock/calendar, MK14 VDU, Horse race
INGENUITY UNLIMITED .. .. .. .. .. .. .. .. 66
Motor Controller - Telephone Timer - Conversation Aid
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. .. 17
NEWS & MARKET PLACE 18
Including Countdown
INDUSTRY NOTEBOOK by Nexus .. .. .. .. .. .. .. .. .. 23
Blue skies for the electronics industry?
EXTRA CASE COUPON .. .. .. .. .. .. .. .. .. .. 35
To save you money on another case
SPECIAL OFFER -CAR AUDIO BOOSTER .. .. .. .. .. .. .. .. 62
Beef up the hi-fi in your car
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. .. .. 65
More plans for the Space Shuttle
PATENTS REVIEW .. .. .. .. .. .. .. .. . .. . 69
Motional Feedback - Indoor Aerial
OUR SEPTEMBER ISSUE WILL BE ON SALE FRIDAY, 14 AUGUST 1981
(for details of contents see page 40)
VOLUME 17 No. 9 SEPTEMBER 1981
CONSTRUCTIONAL PROJECTS
REMOTE KEYBOARD by J. Lewis .. .. .. .. .. 24
Interface the layman to your computer
ANALOGUE FREQUENCY METER by Andy Flind .. .. .. .. .. 32
Up to 1 MHz measured proportionally at better than 2%
PE RANGER 27FM Part 1 by Michael Tooley BA. and David Whitfield MA., M.Sc. .. 40
Introduction to our CB rig
DRUM SYNTHESISER by P.Balley .. .. .. .. .. .. 50
Provides a range of sounds from a pulse input
AUDIO ANALYSER Part 2 by Michael TooleyBA. and David Whitfield MA., B.Sc. . .. 68 Construction and use GENERAL FEATURES
SPEECH RECOGNITION SYSTEM by Anthony Young .. .. .. .. .. 28
How 'Katrina' got Big Ears!"
THE ELECTRONIC CAR by Walter Musty .. .. .. .. .. .. .. 36
A look at present systems and future developments
SEMICONDUCTOR UPDATE by R. W. Coles .. .. .. .. .. .. .. 59
Featuring MC13002 GL-1O5XX IR-2E01
DIGITAL DESIGN Part 2 by Tom Gaskell BA . .. .. .. .. .. .. .. 60
Power supplies, inputs and outputs
MICROPROMPT .. .. .. .. .. .. .. .. .. .. 74
Exchange of software and ideas
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. .. .. 17
NEWS & MARKET PLACE 18
Including Countdown and Points Arising
INDUSTRY NOTEBOOK by Nexus 23
A sceptical view of 'YIT'
EXTRA CASE COUPON .. .. .. .. .. .. .. .. .. 27
Save yourself some money on another case
PATENTS REVIEW .. .. .. .. .. .. .. .. .. .. 35
Improved PA
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. 48
Packed with information on extra-terrestrial activity
SPECIAL OFFER-GRAPHIC EQUALISER .. .. .. .. .. .. .. 49
To match our Audio Analyser project
A NEW GENERATION OF SOFTYS .. .. .. .. .. .. .. 73
Mike Abbott takes a look at Softy 2
OUR OCTOBER ISSUE WILL BE ON SALE FRIDAY, 11 SEPTEMBER 1981
(for details of conteYits see page 31)
VOLUME 17 No. 10 OCTOBER 1981
CONSTRUCTIONAL PROJECTS
HOROLOGICUM STAR CLOCK by J.S.B. Dick .. .. .. .. .. 22
Extra-terrestrial time keeping made easy
HEADPHONES WITH A DIFFERENCE by A. B. Bradshaw .. .. .. .. .. 36
Improves the presence of personal stereo
INDUCTIVE DISCHARGE CAR IGNITION SYSTEM by K. Wevill . .. .. .. 40
Contact breaker, breakerless and extended dwell circuits
PE RANGER Part 2 by Michael Tooley B.A. and David Whitfield M.A., M.Sc . . , . . . 50
Circuit description and construction
PE PULSER by Tom Gaskell B.A. .. .. . . 62
An all-purpose design for CMOS and TTL incorporated in our Digital Design Techniques series
AUDIO ANALYSER Part 3 by Michael Tooley BA. and David Whitfield MA., M.Sc .. .. 67
Self-contained noise source and microphone pre-amp circuits
GENERAL FEATURES INTRODUCTION TO ROBOTICS by Professor Wilfred Heginbotham O.B.E. D.Sc .. .. 30
A look at robots used in industry
SEMICONDUCTOR UPDATE by R. W.Coles .. .. .. .. .. .. 35
Featuring OPL100 WD55 LM396
DIGITAL DESIGN TECHNIQUES Part 3 by Tom Gaskell BA . .. .. .. .. .. 58
Touch switches, timers and oscillators
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. .. .. .. 17
NEWS & MARKET PLACE 18
Including Countdown
USING YOUR FREE IC REMOVAL TOOL .. .. .. .. .. .. .. 20
INDUSTRY NOTEBOOK by Nexus 21
Advice for the young unemployed
SPACEWATCH by Frank W. Hyde .. .. .. .. .. .. .. .. 48
Sunspots and the earth's climate-A second visit to Saturn-Dynamics Explorer mission
SPECIAL OFFER-IN CAR ENTERTAINMENT .. .. .. .. .. 49
PATENTS REVIEW .. .. .. .. .. .. .. .. .. 73
SPECIAL OFFER-GSC EXPERIMENTOR KIT .. .. .. .. .. 73
OUR NOVEMBER ISSUE WILL BE ON SALE FRIDAY, 9 OCTOBER 1981
(for details of contents see page 57)
VOLUME 17 No. 11 NOVEMBER 1981
CONSTRUCTIONAL PROJECTS
PE ROBOTS Part 1 by Richard Becker 24
Three industrial robots offering an introduction to tomorrow's technology
PE BANDBOX Part 1 by Alan Boothman B.Sc .. 32
Provides a backing trio of drums, bass and a chord instrument for the solo musician
DISCO HAT by Tom Gaskell BA . .. .. .. .. 43
Another project incorporated in our Digital Design Techniques series
PE RANGER Part 3 by Michael Tooley BA. and David Whitfield M,A., M.Sc. 48
Construction and testing UK1O1
MONITOR CHANGE by Ian Hickman 58
WEMON and UKO2 working side by side
GENERAL FEATURES
SEMICONDUCTOR UPDATE by R. W. Coles .. .. .. .. .. .. .. 23
ICL8073 AD7581 Z6132
DIGITAL DESIGN TECHNIQUES Part 4 by Tom Gaskell BA 40
Sequential circuits
INGENUITY UNLIMITED 62
Accented-beat metronome-3 channel sound to light-0.99s photographic timer
MICROBUS by D.J D. .. .. .. .. .. .. 66
Some circuits and programs for ZX80/81
NEWS AND COMMENT
EDITORIAL .. .. .. .. .. .. .. .. 17
NEWS & MARKET PLACE 18
Including Points Arising
INDUSTRY NOTEBOOK by Nexus 21
What's going on behind the scenes
SPACEWATCH by Frank W. Hyde 31
Another update on extra-terrestrial activity
SPECIAL OFFER-GSC EXPERIMENTOR KIT 46
READOUT 54, 61
Our readers air their views
PATENTS REVIEW 56
DBX versus Toshiba
SPECIAL OFFER-VERO WIRE WRAP KIT 57
All you need to get started on wire wrap
COUNTDOWN 68
What to see, when and where to see it
OUR DECEMBER ISSUE WILL BE ON SALE FRIDAY, 13 NOVEMBER
(for details of contents see page 65)
VOLUME 17 No. 12 DECEMBER 1981
CONSTRUCTIONAL PROJECTS
SPACE EVADERS by Tom Gaskell BA. ... ... ... ... ... 22
Galactic battle between aliens and humans
PE CAR COMPUTER Part 1 by P. MacFarlane ... ... ... ... ... ... ... 30
Modes of operation, boards and construction
PE ROBOTS Part 2 by Richard Becker and Tim Orr ... ... ... ... ... ... 42
The interface board
PE BANDBOX Part 2 by Alan Boothman B.Sc ... ... ... ... ... ... 52
Principles and construction of the peripheral system
PE RANGER Part 4 by Michael Tooley B.A. and David WhitfieldM.A., M.Sc ... ... ... 60
Alignment and fault finding
GENERAL FEATURES
DIGITAL DESIGN TECHNIQUES Part 5 by Torn GaskelI BA ... ... ... 38
Advanced sequential circuits
SEMICONDUCTOR UPDATE by R. W. Coles ... ... ... ... 48
LM1894 CL 7663 Z800
MICROPROMPT ... ... ... ... ... ... ... ... 66
Hardware and software exchange point for PE computer projects
NEWS AND COMMENT
EDITORIAL ... ... ... ... ... ... ... ... ... ... ... 17
NEWS & MARKET PLACE . ... ... ... ... ... ... ... ... 18
Including Countdown and Points Arising
INDUSTRY NOTEBOOK by Nexus ... ... ... ... ... ... ... ... 21
What's going on behind the scenes
SPECIAL OFFER-HI-Fl ... ... ... ... ... ... ... ... ... 29
A passport to listening pleasure
SPACEWATCH by Frank W. Hyde ... ... ... ... ... ... ... ... 51
News of the second shuttle mission
SPECIAL OFFER-DIGITAL MULTIMETER ... ... ... ... ... ... ... 59
A six function meter kit with lcd, for under £20!
INDEX FOR VOLUME 17 ... ... ... ... ... ... ... ... ... 68
OUR JANUARY ISSUE WILL BE ON SALE FRIDAY, 11 DECEMBER 1981
(for details of contents see page 37)
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