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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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