January 1973
         CONSTRUCTIONAL PROJECTS 
I.C. LINEAR OHMMETER by G. Griffiths 
Simple instrument with three switched ranges from 0-100k 26
BIOLOGICAL AMPLIFIER by D. Bollen 
Demonstrating how neuro systems and electronic systems can interact 32 
P.E PIANO - 5 by A.J. Boothman 
Cabinet construction and tuning 44 
P.E. DIGI-CAL - 7 by R.W. Coles
Clock generator board 61
 
GENERAL FEATURES 
CEEFAX A proposed new broadcasting service 52 
DESIGNING WITH I.C.s - 4 by A. Foord 
Schmitt Trigger 57 
         
AUDIO FAIR by M.A. Colwell
Current hi-fi scene as seen and heard at Olympia 69 
         
NEWS AND COMMENT
EDITORIAL
Down to Earth 25 
         
SPACE WATCH by Frank W. Hyde 
Commentary on latest developments in space 30 
         
ON THE FRINGE by Gerry Brown 
The more unusual aspects of electronics 43 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 54 
         
PATENTS REVIEW Thought provoking Ideas on file at the British Patents Office 6O 
         
POINTS ARISING 
IC. Intercom 66
 
BOOK REVIEWS Selected new books we have received 74 
         
ANNOUNCEMENT Notices of special interest to all readers 31
         
         
         
         February 1973
         CONSTRUCTIONAL PROJECTS
         
P.E. TRIFFID IC. RADIO by F. R. Heath 120 
An easy to build inexpensive portable a.m. radio using the latest integrated circuit 
BIOLOGICAL AMPLIFIER by D. Bollen 126 
A brain rhythm frequency meter and a cardiophone 
P.E. SOUND SYNTHESISER-1 by G. D. Shaw 140 
A comprehensive and versatile instrument for the experimenter in sound 
P.E. DIGI-CAL--8 by P. W. Co/es 148 
Logic and construction of the adder board 
         
GENERAL FEATURES 
AUDIO FREQUENCY DISCRIMINATOR by G. F. A. Hoffman de Visme 133 
Use of switching circuits for frequency separation 
DESIGNING WITH I.C.s-5 by A. Foord 151 
Operational amplifiers with power stages 
INGENUITY UNLIMITED  165
Proximity Switch
Sound/Light Modulator
         
NEWS AND COMMENT
         
EDITORIAL-The Whole And The Parts 119 
SPACEWATCH by Frank W. Hyde 136 
Ecological studies from space and India's space programme 
REPORT FROM AUSTRALIA by J. M. Waldie 139 
F.M. Broadcasting proposals-Sydney audio show-Optical communications 
INDUSTRY NOTEBOOK by Nexus 146 
What's happening inside industry 
ELECTRONORAMA 147 
Focus on the new satellite-communication aerial at Goonhilly 
NEWS BRIEFS 154 
Computer '72-High Speed Printer using a Laser 
BOOK REVIEWS 161 
Selected new books we have received 
PATENTS REVIEW 162 
Thought provoking ideas on file at the British Patent Office 
MARKET PLACE 166 
Catalogues you should have and new products available.
         
         March 1973
                 VOLUME 9 No. 3 MARCH 1973 
         
CONSTRUCTIONAL PROJECTS 
HI Fl TAPE LINK by P. S. Ewer 
All the electronics to bring Hi Fl to an existing tape deck 210 
P.E. SOUND SYNTHESISER-2 by C. 0. Shaw 
Twin stabilised power supply unit and racking details 232 
SIGNAL INJECTOR and TRACER by A. A. Penfold 
Useful dual-purpose item of test gear for a.f. and r.f. applications 238 
P.E. DIGI-CAL-9 by A. W. Coles 
Logic and construction of the programme board 242 
         
GENERAL FEATURES 
ELECTRONIC TIMEPIECES-1 by J. B. Dance 
Evolution of designs up to tuning-fork principle 221 
DESIGNING WITH l.C.s-6 by A. Foord 
Basic memory circuits 249
         
NEWS AND COMMENT
EDITORIAL-Our Transistor 209 
SPACE WATCH by Frank W. Hyde 
Is someone trying to contact us?-USSR meteorite research 217 
ON THE FRINGE by Gerry Brown 
The more unusual aspects of electronics 218 
INDUSTRY NOTEBOQK by Nexus 
What's happening inside industry 226 
TRANSISTOR SILVER JUBILEE 
The team behind the invention-anniversary events 229 
TRANSISTOR TRAIL 
Highlights of research and development leading to the first transistor 230 
NEWS BRIEFS 
Tidal Monitoring-Radar Testing-UK Tops in Data Transmission 241 
POINTS ARISING 
Biological Amplifier -P.C. Linear Ohmmeter 241 
BOAT SHOW REPORT 
A look at marine electronics for the small boat owner 253 
PATENTS REVIEW 
Thought provoking ideas on file at the British Patents Office 254 
MARKET PLACE 
New products and component information 258
         
Our April issue will be published on Friday, March 9, 1973
         
         
         
         April 1973
         CONSTRUCTIONAL PROJECTS
P.E. SOUND SYNTHESISER-3 by G. D. Shaw
Voltage controlled oscillators and inverter 306
         
NOVEL BATTERY ELIMINATOR by J. S. Goddard
A stabilised 9V supply from the mains 313
         
HI Fl TAPE LINK by P. S. Ewer Constructional details 326
         
ALL-AROUND SECURITY ALARM by J. Andrews
Domestic burglar alarm with fail-safe features 338
P.E. DIGI-CAL-lO by R. W. Co/es M counter board 342
         
GENERAL FEATURES
ELECTRONIC TIMEPIECES-2 by J. B. Dance 
Quartz crystal control and time displays 318 
DESIGNING WITH I.C.s-7 by A. Foord 
Counters and displays 350 
         
NEWS AND COMMENT 
EDITORIAL-Fashions in Building 305 
         
BOOK REVIEWS 
Selected new books we have received 317 
SPACEWATCH by Frank W. Hyde 
Space budget-Lunokhod 2-Skylab 325 
         
ELECTRONORAMA 
Focus on Post Office telephone paging system 334 
         
STRICTLY INSTRUMENTAL by K. Lenton-Smith 
Comments on contemporary sounds 337 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry? 349
         
         
         
         May 1973
         CONSTRUCTIONAL PROJECTS 
PUSHBUTTON VARICAP STEREO TUNER by S. R. Beeching 
Easily constructed stereo tuner using varicap tuning modules 400 
P.E. DIGI-CAL-11 by A. W. Coles 
Concluding article 406 
P.E. SOUND SYNTHESISER-4 by G. D. Shaw 
Ramp generators and input amplifiers 420 
LOGIC TUTOR by G.D. Bishop and M. Hughes 
An educational aid on which a wide range of logic experiments can be performed 430 
         
GENERAL FEATURES 
BRAIN X-RAY by K. A. Hill 
The EMI-Scanner--A computerised system for diagnosing brain diseases 413 
LOGIC TUTOR EXPERIMENTS-1 by M. Hughes 
The first article in this new series deals with basic gates 438 
         
NEWS AND COMMENTS 
EDITORIAL-Stereo Radio Without Tears 390 
BOOK REVIEWS Selected new books we have received 427,446 
KIT REVIEW The SUPACAL pocket calculator 428 
SPACEWATCH by Frank W. Hyde 
Skylab experiments 429 
         
POINTS ARISING 
Hi Fl Tape Link-P.E. Triffid IC. Radio-A.F. Signal Generator 438 
ON THE FRINGE by Gerry Brown 
The more unusual aspects of electronics 441 
NEWS BRIEFS 
Design Council awards '73-Electronics Course 441 
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 442 
PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 445
         
SPECIAL DATA SHEET
DISPLAY DEVICE IDENTICHART At-a-glance information on many types of readout devices.
         
         June 1973
         CONSTRUCTIONAL PROJECTS 
GENERAL PURPOSE TIMER by J. B. Dance 
A simple ic. based design for photographic and similar applications 486 
AUTOTONE by R Skagestad 
A novel digital melody maker 490 
P.E. SOUND SYNTHESISER-5 by G. D. Shaw 
Sample-Hold and Noise Generator Module 506 
WIDE RANGE PULSE GENERATOR by M. J. Trand 
Simple i.c. generator covering 1 Hz to 1 MHz in switched ranges 522 
         
GENERAL FEATURES 
SPEECH SYNTHESIS by A. V. Flatman 
History and present day accomplishments in the field of phonetics 494 
THE TRANSISTOR AND BEYOND by Prof. G. D. Sims 
An appreciation of past developments and future prospects 504 
THE 555 TIMER I.C. by J. B. Dance 
A new integrated circuit discussed in detail with design parameters for a variety of applications 514 
LOGIC EXPERIMENTS-2 by M. J. Hughes 
Demonstrating logic inversion 518 
         
INGENUITY UNLIMITED  529
Variable Stabiliser
Lamp Strobe
Timing Circuit
         
NEWS AND COMMENT
         
EDITORIAL-Buried From View 485 
         
BOOK REVIEWS 
Selected new books we have received 586 
         
SPACEWATCH by Frank W. Hyde 
Rings of Saturn-Technical Euthanasia - Orange Moon Soil - Lunar Probe 503 
         
SOUND '73 Report from the Public Address Engineers' Exhibition 512 
PATENTS REVIEW Walking Stick for the Blind - Magic Wipers 513 
         
POINTS ARISING 
Novel Battery Eliminator - Camera Shutter jester - P.E. Gemini Tuner 518 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 521 
SONEX '73 Hi Fi equipment show report 525 
NEWS BRIEFS Motorway Communication  -Underwater Detection  -Aircraft Tactical Simulator - PO Digital Trunk Network 526
         
         July 1973
         CONSTRUCTIONAL PROJECTS 
ELECTRONIC NOSE by D. Bollen 
A portable gas and vapour detector 574 
SWITCHED GAIN PREAMPLIFIER by D. Crochet 
A wide band general purpose instrument 580 
P.E. SOUND SYNTHESISER-6 by G. D. Shaw 
Ramp generator and sound studio set-up 599 
TWIN POWER SUPPLY by G. S. Schajer 
Constant current/constant voltage up to one amp 604 
LIGHTING CONTROL UNIT by G. A. Davies 
Single knob control for multiple effects 611
         
GENERAL FEATURES
         
NEW DEVICES. .. APPLICATIONS
The latest in circuit ideas for the experimenter 584 
         
INGENUITY UNLIMITED  537
Tape Motor Controller
1.C. Lamp Flasher
Windscreen Wiper Control
Engine Temperature Controller
Brake Light Monitor 
         
25 YEARS OF SEMICONDUCTORS-1 by M. J. Rose 
Transistors and small signal diodes - 591
         
LOGIC TUTOR EXPERIMENTS-3 by M. Hughes
NAND gates 603
         
NEWS AND COMMENT 
EDITORIAL - Another Sense 573 
         
SPACEWATCH by Frank W. Hyde 
Outer Hebrides Activity-Soviet Satellites 579 
         
BOOK REVIEWS 
Selected now books we have received 533 
         
POINTS ARISING 
Pushbutton Varicap Stereo Tuner 533 
         
PHYSICS EXHIBITION 
Electronics in science at the Phys. Soc. 594 
ON THE FRINGE by Gerry Brown 
The more unusual aspects of electronics 595 
         
NEWS BRIEFS 602
Telephone Scrambler
Commercial Radio
Data Transmission
Golden Jubilee 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 617 
         
PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 618 
MARKET PLACE Workshop aids and now products available 621 
READOUT Readers letters and back number requests 622
         
         August 1973
         CONSTRUCTIONAL PROJECTS 
BATTLE CHESS by D. Coles 
Bring the battlefield to the game of chess 664 
AUDIO COMPRESSOR by R. A. Penfold 
Provides an almost constant output from widely varying inputs 669 
P.E. SOUND SYNTHESISER-1 by G. 0. Shaw 
Reverberation amplifier for springline, ring modulator and peak level meter 675 
550V MEGOHMMETER by B. V. Lamb 
A high voltage generator for checking mains insulation 696 
SIMPLE FLASHER by J. B. Dance 
Using the 555 timer chip to control the operation of flashing lights 702 
         
GENERAL FEATURES 
         
INGENUITY UNLIMITED  672
Light-Operated Power Controller
Reed Relay Current Trip
Reversing Light Warning 
         
25 YEARS OF SEMICONDUCTORS-2 by M. J. Rose 
Power devices, photo devices and integrated circuits 692 
         
LOGIC TUTOR EXPERIMENTS-4 by M. J. Hughes 
De Morgan's Theorem 704
         
NEW DEVICES ... APPLICATIONS
The latest in circuit ideas for the experimenter 105
         
NEWS AND COMMENT
         
EDITORIAL-Two-Way Link 663 
         
SPACEWATCH by Frank W. Hyde  674
Sun jolts the earth
Chinook winds
Asteroids 
         
STRICTLY INSTRUMENTAL by K. Lenton-Smith 
Comments on contemporary sounds 577 
         
COMPONENT SHOW '73 
Report from the recent London RECME Show held at Olympia 559 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 696 
         
ELECTRONORAMA 
Looking at the latest developments in electronic watches 700 
         
READOUT 
Author of the Synthesiser answers back 710 
         
IMPORTANT ANNOUNCEMENT Quadraphonics comes to P.E. 691
         
         September 1973
         CONSTRUCTIONAL PROJECTS 
P.E. RONDO QUADRAPHONIC SOUND SYSTEM by B. Cole 
The first of a series of articles describing Quadraphonics in theory and practice with practical details of a decoder 152 
PHASING UNIT by D.Benfleld 
A simple sound effects unit 772 
P.E. SOUND SYNTHESISER-4 by G. D. Shaw 
Voltage controlled output amplifiers and differential amplifier 715 
AUDIO LOGIC PROBE by B. Woodland 
Uses two different tones to indicate logic levels 702
ENLARGER EXPOSURE METER & THERMOMETER by J. M. Bartlett
An invaluable aid for the photographer who makes his own prints 790 
         
GENERAL FEATURES 
         
INGENUITY UNLIMITED Car windscreen wiper control 70
         
LOGIC TUTOR EXPERIMENTS-5 by M. J. Hughes
Exclusive OR Function 771
         
NEW DEVICES. .. APPLICATIONS
Describing the TGS (Thermal Gas Sensor) of the PE Electronic Nose 180 
         
NEWS AND COMMENT 
         
EDITORIAL-A New Dimension in Sound 151 
         
SPACEWATCH by Frank W. Hyde  767
Boulders of Saturn
Gravity Controversy
ESRO and Satellites
Joint Projects 
         
NEWS BRIEFS  100
Open University & Electronics
British Technology for USA
Measurements 
         
ELECTRONORAMA 
Cable laying in the Atlantic, from factory to sea floor 780 
         
MARKET PLACE A look at ic. accessories and audio equipment 707 
         
INDUSTRY NOTEBOOK 
What's happening inside industry 780 
         
PATENTS REVIEW  801
Cough Monitoring
Wind Direction indicators 
         
READOUT
Readers join in the log versus linear controversy 802.
         
         October 1973
         CONSTRUCTIONAL PROJECTS 
SEMICONDUCTOR TESTER-1 by J. H. Perkin 
A general purpose discrete semiconductor tester 352 
P.E. RONDO 
QUADRAPHONIC SOUND SYSTEM-2 by A. A. Cole 
Construction of pre-amplifiers, tone and balance controls and 20W amplifiers 866
P.E. SOUND SYNTHESISER-9 by G. D. Shaw 
Voltage controlled output amplifiers and differential amplifier 882
WIND AND RAIN EFFECTS by P. J. Tyrrell A simple sound effects unit 888
         
GENERAL FEATURES
         
NEW DEVICES.. . APPLICATIONS
New integrated circuits for use in cars 856 
         
INGENUITY UNLIMITED  857
Series Regulator
Events Timer with Readout
Two Tone Audio Alarm Oscillator 
         
LOGIC TUTOR EXPERIMENTS-6 by M. J. Hughes 
The wired-OR function 862 
         
PHASED LOCKED LOOPS-1 by J. B. Dance, M.Sc. 
Phase locked loop principles and definitions 876
         
NEWS AND COMMENT
         
EDITORIAL-Amateur Radio Jubilee 851 
         
SPACEWATCH by Frank W. Hyde 861
Red Planet Probes
Venus Probe
Skylab Results
         
POINTS ARISING  879
Wide Range Pulse Generator
The 555 Timer
Audio Compressor
Lighting Control Unit
Phasing Unit
P.E. Sound Synthesiser
550 Volt Megohmmeter 
         
PATENTS REVIEW 
Stereo Amplifier A.V.C.-Four Channel Volume and Balancing Control 894 
         
INDUSTRY NOTEBOOK 
What's happening inside industry 897 
         
READOUT  893
More on the P.E. Sound Synthesiser
Back Numbers Wanted
         
SPECIAL DATA SHEET
AUDIO IC. IDENTICHART At-a-glance information on over 80 different devices.
         
         November 1973
         CONSTRUCTIONAL PROJECTS 
STAGE LIGHTING DIMMER by R. Liffen 
A four channel system for controlling 13kW of lighting 950
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-3 by R. A. Cole
Power supplies and main chassis details 956 
P.E. SYNTHESISER-10 by G. D. Shaw 
Keyboard Unit - Log Law Oscillators 964 
SEMICONDUCTOR TESTER-2 by J. H. Perkin 
General purpose discrete semiconductor tester 992 
         
GENERAL FEATURES 
LOGIC EXPERIMENTS-7 by M. J. Hughes 
The half adder 963 
AUTOMATED MAIL by F. J. Morris 
Survey of electronics in the postal service 973
         
NEW DEVICES ... APPLICATIONS
A four digit calculator using an LSI MOS integrated circuit 980 
PHASE LOCKED LOOPS-2 by J. B. Dance 
Phase locked loops in f.m. and am, demodulators, and frequency synthesisers 999 
         
INGENUITY UNLIMITED  995
P.S.U. protection
Servo amplifier
Car lights monitor 
         
NEWS AND COMMENT 
EDITORIAL - Take Your Pick 949 
         
SPACEWATCH by Frank W. Hyde  955
Black Holes
Comet Kohoutek
Mars Vehicles 
         
ON THE FRINGE by Gerry Brown 
The more unusual aspects of electronics 960 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 996
         
SPECIAL SUPPLEMENT - AUTUMN QUICKIES
DIODE THERMOMETER
WAA WAA
OPTOELECTRONICS
TOUCH SWITCH
         
FREE INSIDE THIS ISSUE: VEROBOARD PRINTED WIRING BOARD.
         
         December 1973
         CONSTRUCTIONAL PROJECTS 
PARTY STROBE by M. J. Hughes 
Freeze motion with this party light 1054 
VOICE OPERATED FADER by A. J. Russell 
Fit 'talkthrough' to your discotheque 1051
P.E. RONDO QUADRAPHONIC SOUND SYSTEM-4 by R. A. Cole
Continuing the mechanical construction and wiring 1012 
P.E. SOUND SYNTHESISER-11 by G. 0. Shaw 
Hold, modulation amplifiers, mixer and envelope shaper for keyboard unit 1082 
9V BATTERY ELIMINATOR by A. M. Rudlcin 
A nine volt power-pack in a battery case 1090 
         
GENERAL FEATURES 
PHASE LOCKED LOOPS-3 by J. B. Dance 
Applications of phase locked loop integrated circuits 1060 
LOGIC TUTOR EXPERIMENTS-8 by M. J. Hughes 
The full adder 1010 
         
INGENUITY UNLIMITED  1093
Trace Doubler for TTL Variable Pulse Circuit
Tachometer Screenwasher Timing Unit
Mains Neon Flasher 
         
NEWS AND COMMENT EDITORIAL - Twenty-five Years On 1053 
         
BOOK REVIEWS 
Selected new books we have received 1071 
         
SPACEWATCH by Frank W. Hyde  1081
Radio Stars
Siberian Meteorite
Skylab Preliminary Results 
         
STRICTLY INSTRUMENTAL by K. Lenton-Smith 
Comments on contemporary sounds 1081 
         
VIEW POINT 
A reader comments on quadraphony 1091 
         
INDUSTRY NOTEBOOK by Nexus 
What's happening inside industry 1098
         
TRANSISTORS AND CONSTRUCTORS by D. Bollen
A look back to the early days of the transistor 1101
         
PATENTS REVIEW 
Thought provoking ideas on file at the British Patents Office 1103.
         

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