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January 1974
CONSTRUCTIONAL PROJECTS
DIGITAL EXPOSURE TIMER by S. A. Money
Accurate exposure times for enlargers and no setting up required 30
IGNITION TIMING LIGHT by F. T. Kler
Build this ignition timing light and make sure your car is giving peak performance 36
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-5 by R. A. Cole
Construction of an infinite baffle enclosure with four speakers and a crossover unit 44
P.E. SOUND SYNTHESISER-12 by G. D. Shaw
Final board assembly and p.s.u. for keyboard unit 50
POWER SUPPLY for I.C.s by J. Lewis
A dual power supply for those experimenting with i.c.s 62
GENERAL FEATURES
INGENUITY UNLIMITED RIAA Pre-amplifier 43
PHASE LOCKED LOOPS-4 by J. B. Dance
More applications of integrated circuits including stereo decoding 66
NEWS AND COMMENT
EDITORIAL-Fuel and Power - 29
POINTS ARISING
Semiconductor Tester-Party Strobe Light-Voice Operated Fader 35
NEWS BRIEFS
New Revolution-Radio Direction Finder-Communications for North Sea Platform-Weather Satellite 35,38
SPACE WATCH
Research Rockets-News from Jupiter 39
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 40
MARKET PLACE
New products on the market 55
AUDIO FESTIVAL AND FAIR
Review of the '73 Audio Fair held at Olympia 56
BOOK REVIEWS Selected new books we have received 58
February 1974
VOLUME 10 No. 2 FEBRUARY 1974
CONSTRUCTIONAL PROJECTS
100W INVERTER/CHARGER by A. Verrill
Maintains essential services in the home 132
STAGE LIGHTING DIMMER by A. Liffen
The author replies to points raised by readers 142
P.E. SOUND SYNTHESISER-13 by G. D. Shaw
This concluding article deals with the keyboard frame and final tuning 151
AUTO CHARGER-REGULATOR by I. A. Watkinson
Convert your vehicle to solid state charging control and improve efficiency 156
AUDIO/VISUAL THERMOMETER by M. Plant
A preset temperature sensing device that has many applications 164
AUDIO MILLI VOLTMETER by J. N. Watt
Measures alternating voltages down to lmV at frequencies from 30Hz to 50kHz 168
GENERAL FEATURES
INGENUITY UNLIMITED
Touch Volume Control-Electronic Doorbell 141,166
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-6 by A. A. Cole
Pick-ups and turntables for quadraphonics 148
NEWS AND COMMENT
EDITORIAL-Conservation 131
SPACE WATCH by Frank W. Hyde
The French Approach-The Japanese Approach 145
MARKET PLACE
A look at a cassette tape library, electronic organ kit, and a new ic. audio amplifier 150
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 167
READOUT
Quadraphonic sound controversy 118
Our March issue will be published on Friday, February 8, 1974
March 1974
CONSTRUCTIONAL PROJECTS
RHYTHM GENERATOR by Brice Ward
A programmable source for 64,000 rhythmic patterns 228
FLUORESCENT LAMP INVERTER by C. J. Mills
Emergency lighting from a 12V supply. Blueprint design for 8, 13 and 20W units 237
ELECTRONIC SNAP by C. J. Allen
End those arguments about who answered first with this novelty circuit 246
P.E. SCORPIO Mk 2 IGNITION SYSTEM by D. S. Gibbs & I. M. Shaw
Electronic ignition system. Blueprint design for 6 or 12V cars 248
A.C. DETECTOR PROBE by B. Bowles
A simple circuit for detecting the presence of oscillations 253
CRYSTAL CALIBRATION OSCILLATOR by R. A. Penfold
A highly stable fixed frequency oscillator for calibration purposes 258
BOOLEAN ALGEBRA-1 by B. J. Wood
An introduction to switching theory 264
GENERAL FEATURES CONSTANT CURRENT GENERATORS-1 by C. R. Masson
First of a two part series on the design and use of these versatile circuits 242
INGENUITY UNLIMITED 260
Optical Communications System
Boiler Gas Valve Operation
Slow Timebase Oscillator
Tape Guide
NEWS AND COMMENT
EDITORIAL-Inspiring Times 227
SPACEWATCH by Frank W. Hyde Skylab Mission-Pioneer 10 and Jupiter 241
ON THE FRINGE by Gerry Brown The more unusual aspects of electronics 252
BOOK REVIEWS
Selected new books we have received 269
ESP etc. by B. H. Baily
Unexplained happenings and phenomena 270
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 273
PATENTS REVIEW
Thought provoking ideas on file at the British Patents Office 274
*SPECIAL FREE BLUEPRINT
FLUORESCENT LAMP INVERTER - P.E. SCORPIO Mk 2 IGNITION SYSTEM
April 1974
CONSTRUCTIONAL PROJECTS
LIQUID CRYSTAL CLOCK by S. Garrett
Digital alarm clock with facilities for switching other domestic appliances 318
RHYTHM GENERATOR by Brice Ward
Concluding article on a programmable source for 64,000 rhythmic patterns 335
BOOLEAN ALGEBRA-2 by B. J. Wood
Design for a simple adder/subtractor 341
ANYONE AT HOME? by O. N. Bishop
A domestic intruder deterrent system 348
GENERAL FEATURES
FIRST STEPS IN CIRCUIT DESIGN-1 by A. P. Stephenson
Beginner's guide to transistor circuit design 324
CONSTANT CURRENT GENERATORS-2 by C. R. Masson
Concluding article on the design and use of these versatile circuits 356
INGENUITY UNLIMITED 362
Transistor Tester
Switch-on Surge Eliminator
Neon Tester
Electronic Switch
Power Supply
NEWS AND COMMENT
EDITORIAL - Liberated Design 317
READOUT
Readers who need help 322
POINTS ARISING
Connoisseur BD1 kit 322
SPACEWATCH by Frank W. Hyde
Military and Space-Venus and Mercury Probe 323
STRICTLY INSTRUMENTAL by K. Lenton-Smith
Comments on contemporary sounds 328
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 332
PATENTS REVIEW
A look at the effects that the EEC will have on British Patents 353
ESP, etc. by B. H. Baily
Unexplained happenings and phenomena 355
SPECIAL 8-PAGE SUPPLEMENT
CAMERA ELECTRONICS 1-8
May 1974
CONSTRUCTIONAL PROJECTS
SOUND BENDER by D. Bollen
Design Chart feature for a versatile sound effect unit, based on a simply
constructed audio modulator 412
ELECTRONIC FLASH METER by J. Tubby
Obtain good black-and-whit and colour results with this simple to operate
flash exposure meter 416
AN IMPROVED BATTERY CHARGER by J. N. Watt
A low cost "fail safe" design which incorporates short-circuit, reverse polarity and overcharge protection 434
LIQUID CRYSTAL CLOCK by S. Garrett
Final constructional details and setting-up instructions 444
GENERAL FEATURES FIRST STEPS IN CIRCUIT DESIGN-2 by A. P. Stephenson
The second part of this instructional series looks at transistor parameters and their effect on circuit design 426
INGENUITY UNLIMITED Waa-Waa effects circuit-Universal Flasher 430, 438
LIQUID CRYSTALS by G. P. Stenning A look at a new development in display techniques 431
NEWS AND COMMENT
EDITORIAL-Growth Rate 411
NEWS BRIEFS
British National Data Buoy - Solid-State TV Camera - Oxford Street Store 422
SPACEWATCH by Frank W. Hyde Energy from Space 425
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 439
ESP, etc. by B. H. Bally Unexplained happenings and phenomena 442
MARKET PLACE Interesting new products 453
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 454
READOUT A selection of readers' letters 457
POINTS ARISING
P.E. Rondo - 100W inverter/Charger - Auto Charger-Regulator 457
*SPECIAL FREE DESIGN CHART
P.E. SOUND BENDER
June 1974
CONSTRUCTIONAL PROJECTS
R/C BRIDGE by D. W. Easterling
A useful item of test gear 502
MPG. METER by S. Jones
Uses the car's electric fuel pump to give continuous reading of fuel consumption 507
TELEBELL by J. N. Watt
A remote repeater for telephone bell 524
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-7 by R. A. Cole
Audio section round-up and modifications 528
THEATRE CUEING LIGHT by S. H. Davies
A simple signalling system suitable for use by amateur dramatic societies 532
GENERAL FEATURES
INGENUITY UNLIMITED 511
Logic Tester
Touch Switch
Power Supply
Circuit Board preparation
Timebase Marker circuit
Tunnel Diode in a Schmitt
Simple Oscillator
FIRST STEPS IN CIRCUIT DESIGN-3 by A. P. Stephenson
Choosing components and supply voltage for correct biasing 520
NEW DEVICES... APPLICATIONS
An integrated circuit programmable counter/timer 535
RANDOM TIMER by B. H. Baily
A novel circuit for E.S.P. experiments 540
NEWS AND COMMENT
EDITORIAL-Mind Over Matter 501
POINTS ARISING 510
Anyone at Home-Auto Charger/Regulator-Boolean AlgebraSlow Timebase Oscillator-Semiconductor Tester-Battery Eliminator-Power Supply for IC's-Rhythm Generator
SPACEWATCH by Frank W. Hyde
Kohoutek Results-Titan/Centaur 519
NEWS BRIEFS
Laser Beam Phone Calls-Medical Logging Device-Paging Down Under 531
MARKET PLACE A look at a printed circuit kit, oscilloscopes and wiring boards 534
ESP, etc. by B. H. Baily
Unexplained happenings and phenomena 539
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 542
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 545
READOUT A selection of readers' letters 546
July 1974
CONSTRUCTIONAL PROJECTS
P.E. POWER SLAVES by B. Reeson
A family of dual-channel high power audio amplifiers 590
RANDOM LIGHT DISPLAY by K. L. Spence
A simple lighting unit capable of producing an endlessly varying and unpredictable pattern of colours 607
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-8 by R. A. Cole
Introduction to the f.m. tuner and decoder with decoder construction details 610
CAR SYSTEMS MONITOR by J. P. Perry
Safeguard yourself against the silent faults; add audible indication to water, oil and charging circuits 614
NIM MACHINE by R. D. Mount
An unbeatable opponent for the old chinese stick game 627
GENERAL FEATURES FIRST STEPS IN CIRCUIT DESIGN-4 by A. P. Stephenson
Biasing gain and the emitter follower 596
INGENUITY UNLIMITED
Synthesiser patchboard 603
SOLAR POWER AND ITS APPLICATIONS FOR TODAY by P. S. Woodcock
A look at the utilisation of solar energy and its effects 618
NEWS AND COMMENT
EDITORIAL-SOUND POWER 589
SPACEWATCH by Frank W. Hyde
The Sun by Skylab 595
ELECTROMUSE by Malcolm Pointon
A musician discusses the application of electronic techniques to composition and performance 600
BOOK REVIEWS
Selected new books we have received 604,616
NEWS BRIEFS
Marconi Centenary Exhibition-Obituary 616, 625
TUNING IN TO ESP by Peter Verwig
A report from a recent IEEE conference in America on parapsychology 617
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 622
PATENTS REVIEW
Reminders on general British Patent procedures 631
READOUT A selection of readers' letters 634
SOUND SYNTHESIS FOR THE AMATEUR
A special offer to Clubs, Schools and Universities to hear the P.E. Lecture on "Sound Synthesis" using the P.E. Synthesiser 635
August 1974
CONSTRUCTIONAL PROJECTS HIGH IMPEDANCE VOLTMETER by T. P. Manning & R. Hider
Scientific measurements made possible with this simple but effective instrument 678
P.E. POWER SLAVES by B. Reeson
Concluding constructional information for the Power Slave family 699
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-9 by R. A. Cole
Completion of the F.M. Stereo Tuner construction 706
SUB-AQUA COLOUR TEMPERATURE INDICATOR by 0. N. Bishop
Indicates which filter to use to obtain perfect colour photographs either above or below water 716
GENERAL FEATURES FIRST STEPS IN CIRCUIT DESIGN-5 by A. P. Stephenson
Circuits with high input impedance 684
INGENUITY UNLIMITED 691
D.C./D.C. Converter
Heatsink
ELECTRONICS IN SEISMIC EXPLORATION by M. J. Hughes
Techniques used to find the World's subterranean sources of natural wealth 692
NEWS AND COMMENT
EDITORIAL - The Constructor's Lot 617
NEWS BRIEFS
Information Retrieval-Calling China-Traffic Control-Next Decade 687
SPACEWATCH Frank W. Hyde Technology Satellite-Domestic Satellite 688
STRICTLY INSTRUMENTAL by K. Lenton-Smith
Keyboard instruments 696
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 704
lEA EXHIBITION REPORT
A look at the latest trends from industry 710
ESP ETC. by B. H. Baily
Random timer results and news from overseas 713
PATENTS REVIEW 715
Motor Control
Light Operated Clock
False Start Detection
READOUT A selection of readers' letters 722
September 1974
CONSTRUCTIONAL PROJECTS
P.E. CCTV CAMERA by A. V. Flatman
The first article on building a monochrome camera for home entertainment 766
BENCH POWER SUPPLY by D. W. Lloyd
A low cost stabilised bench psu with switched voltage selection and over current protection 786
GAS DETECTORS by J. C. Perrett
A series of gas/smoke detectors suited to use in domestic, industrial and leisure areas-in mains and portable form 794
REMOTE VOLUME CONTROL by R. Whitaker
A simple and useful device, using a single f.e.t. 802
GENERAL FEATURES FIRST STEPS IN CIRCUIT DESIGN--6 by A. P. Stephenson
Amplifier design procedures and pitfalls 774
NEW DEVICES.. . APPLICATIONS
An integrated circuit with a gain in the order of one million 784
INGENUITY UNLIMITED 790
Continuity Tester
Touch Start Rhythm Device
Distance Measurer for GolfersToy Train Speed Controller
R/C Decoder
NEWS AND COMMENT
EDITORIAL - Sorry For The Delay - A New Season and A New View 765
SPACEWATCH by Frank W. Hyde Results from Jupiter - Sunspots and Thunderstorms - Beads from the Moon 779
ELECTROMUSE by Malcolm Pointon
A musician discusses composition and performance 780
ESP etc. by Brian Baily
Unexplained happenings and phenomena 783
BOOK REVIEWS
Selected new books we have received 792
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 801
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 805
MARKET PLACE Interesting new products 808
READOUT A selection of readers' letters 809
October 1974
CONSTRUCTIONAL PROJECTS TOUCH SWITCH by J. Andrews
A proximity switching device with many applications in the home 80
HOME INTERCOM by L. Wise A two-way domestic communicator using principles described in 'First Steps in Circuit Design' 872
P.E. CCTV CAMERA-2 by A. V. Flatman Assembly of the printed circuit boards 879
VOLTAGE CONTROLLED FILTER by R. Gwinn An audio effects unit designed specifically for synthesisers, but can be applied to any audio signal to good effect 884
GAS DETECTORS by J. C. Perreti This concluding article deals with a Boat/Caravan version 894 GENERAL FEATURES FIRST S1EPS IN CIRCUIT DESIGN-7 by A. P. Stephenson The concluding article in this series looks at the design of high power amplifiers 864
INGENUITY UNLIMITED Varicap Tuner Tuning Indicator-Sound/Light Modulator-Phasing Controller 876
HYBRID COMPUTERS by D. Al-Dabass Analogue and digital computer techniques discussed 890
NEWS AND COMMENT
EDITORIAL-Our First Decade 859
SPACEWATCH by Frank W. Hyde Soviet Views of Jupiter-Venus Probes 863
ESP etc. by Brian Baily Unexplained happenings and phenomena 871
BOOK REVIEWS Selected new books we have received 877
MARKET PLACE New products, new suppliers and literature news 878
PATENTS REVIEW Thought provoking ideas on file at the British Patent Office 898
INDUSTRY NOTEBOOK by Nexus What's happening inside industry 905
READOUT A selection of readers' letters and electronic courses 906
FREE INSIDE THIS ISSUE: 24-page booklet P.E. TRANSISTOR GUIDE '74
November 1974
CONSTRUCTIONAL PROJECTS P.E. MINISONIC by D. Shaw
A miniature, battery-operated sound synthesiser 952
ANTI-THEFT ALARM by B. A. Anderson
Protect and immobilise your car with this simple-to-build security device 959
A.F. ATTENUATOR by H. T. Kitchen
A useful addition to your test-gear for simple voltage measurements 975
NOVEL TRANSISTOR TESTER by D. C. Blackford Gives instant indication of transistor type and approximate gain 979
P.E. CCTV CAMERA-3 by A. V. Flatman
Final construction and setting-up procedure 986
CAR CASSETTE POWER UNIT by A. Russell
Enables your cassette player to run from the car battery 991
GENERAL FEATURES
INGENUITY UNLIMITED
Pulsed Pendulum-
Bass Booster-
Voltage Controlled Oscillator
Random Impulse Generator 963
NEW DEVICES.. . APPLICATIONS
Voltage controlled oscillator/precision waveform generator 967
HYBRID COMPUTERS-2 by D. Al-Dabass
The hybrid system considered in detail 971
NEWS AND COMMENT
EDITORIAL-Sonic Spin-off 951
NEWS BRIEFS Carphone expansion-Radio licence plates-ATC in Scotland 958
BRITISH MUSICAL INSTRUMENT TRADE FAIR by G. M. Harvey
A look at some of the most interesting items at this year's fair 982
SPACE WATCH by Frank W.
Hyde Jupiter Orbiter-More about Mercury-Infra-red Telescope-Sunspot Cycles 994
INDUSTRY NOTEBOOK by Nexus What's happening inside industry 998
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 1001
MARKET PLACE Interesting new products 1002
December 1974
CONSTRUCTIONAL PROJECTS
DWELL METER by S. Jones
Check points and distributor bearings with this novel vehicle instrument 1052
P.E. CCTV CAMERA-4 by G. D. Bishop
A choice of two u.h.f. modulators 1056
P.E. MINISONIC-2 by G. 0. Shaw
Details of the voltage controlled oscillator, voltage controlled filter, and envelope shaper/voltage controlled amplifier 1066
IC. PULSE GENERATOR by M. E. Theaker
A low-cost source of logic test pulses 1076
THERMOMETER/CONTROLLER by J. N. Jones
A -68°C to +175°C diode thermometer with analogue readout or control function abilities 1084
GENERAL FEATURES
NEW DEVICES ... APPLICATIONS
Phase locked loop for high performance f.m. receivers 1082
INGENUITY UNLIMITED 1090
Neon Oscillator
Zener Diode Check
Integrated Triffid
Optical Communication
555 Ramp Generator
NEWS AND COMMENT
EDITORIAL-Self Service 1051
THE NEXT DECADE
Readers look to the future of electronics 1060
SPACE WATCH by Frank W. Hyde
The New Jupiter 1062
STRICTLY INSTRUMENTAL by K. Lenton-Smith
Electronics and music 1065
NEWS BRIEFS 1083
Ceefax and Oracle
BOOK REVIEWS
Selected new books we have received 1088, 1094
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 1089
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 1097
READOUT
A selection of readers' letters 1098
SPECIAL DATA SHEET FREE INSIDE THIS ISSUE TRANSISTOR LEAD IDENTICHART
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