| | VOLUME 11 No. 1 JANUARY 1975
CONSTRUCTIONAL PROJECTS
LIGHT PIPE by A. Gwynn
A novel flexible lighting effect for the home, discotheque, or shop 28
DIGITAL LEAF by J. S. Haggis
Grow better greenhouse plants with this automatic moisture control circuit 32
P.E. ORION-1 by D. S. Gibbs & I. M. Shaw
A high quality low cost 20 + 20W stereo amplifier 46
P.E. MINISONIC-3 by 0. D. Shaw
Details of the keyboard controller, ring modulator, noise generator, hf. detector and oscillator, and power amplifiers 58
GENERAL FEATURES
SURFACE ACOUSTIC WAVES by T. S. Fisher Is this the technique of the future? 41
INGENUITY UNLIMITED Sound-to-Light Modulator-Serial Connection Multivibrator 66
NEWS AND COMMENT
EDITORIAL-The Triumphs of Radio Astronomy 27
SPACEWATCH by Frank W. Hyde
Mercury Again-More From Skylab 37
NOBEL PRIZE FOR CAMBRIDGE RADIO ASTRONOMERS by Frank W. Hyde 38
ELECTROMUSE by Malcolm Pointon
Electronics and Music 53
THE NEXT DECADE
Final selection of readers' predictions for the future 54
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 69
MARKET PLACE
Constructional Aid, Tapes, and News Briefs 70
BOOK REVIEWS
Selected new books we have received 13
NEWS BRIEFS
Audio Fair-Link-Up-Price Cut 73
READOUT
A selection of readers' letters 74
Our February issue will be published on Friday, January 10, 1975
VOLUME 11 No. 2 FEBRUARY 1975
CONSTRUCTIONAL PROJECTS
MARINE SPEEDOMETER by C. Gammans
"Tune" your boat with this simple instrument 120
P.E. ORION-2 by D.S. Gibbs & I. M. Shaw
Construction, final testing and fault finding 124
P.E. MINISONIC-4 by G. D. Shaw
Final wiring-up, alternative keyboards and optional extras 140
AC/DC MILLIVOLTMETER by A. J. Woollard
Op-amp design gives a useful and sensitive equipment 148
PROBABILITY ANOMALY DETECTOR by A. Russell
A novel unit for investigations into extra-sensory perception 152
CAR CLOCK REPAIRS by D. L. Cooper
A modification which puts new life into old car clocks 166
GENERAL FEATURES CEEFAX and ORACLE-I by J. Smith
A look at the BBC and ITA systems for data transmission on TV signals 134
INGENUITY UNLIMITED
Patch Lead Sockets-In-circuit Power Detector-Making Printed Circuit BoardsVoltage Controlled Amplifier-Schmitt Circuit Variations-Brake Light Detector 158
NEWS AND COMMENT
EDITORIAL-A Healthy Market 119
SPACEWATCH by Frank W. Hyde
Life Support Systems-Black Holes-Lunar Rocks 133
BOOK REVIEWS
Selected new books we have received 139
NEWS BRIEFS
Colour TV Certificate-Watch Displays-IC. Price Cut 139
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 157
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 165
READOUT A selection of readers letters 168
Our March issue will be published on Friday, February 14th 1975
VOLUME 11 No. 3 MARCH 1975
CONSTRUCTIONAL PROJECTS
ULTRASONIC DOPPLER SHIFT INTRUDER ALARM by J. B. Dance
Protect your home with this easy to construct security system 206
PE. MINISONIC-5 by G. D. Shaw
This concluding article deals with making the most of the Minisonic 212
IN-CIRCUIT OHMMETER by 0. N. Bishop
For measuring the resistance of a component without having to remove it from the circuit 228
ELECTRONIC THERMOSTAT by R. A. Penfold
An accurate temperature controller particularly suitable for photographic work 236
GEIGER COUNTER by M. Plant
Detect radioactive minerals with this portable pocket radiation monitor 242
GENERAL FEATURES
SWITCHING POWER SUPPLIES 223
INGENUITY UNLIMITED
Touch-Switch-Two-way Morse Trainer-Transistor Tester-Lighting Control Circuit 219
NEWS AND COMMENT
EDITORIAL-
On Guard 205
SPACEWATCH by Frank W. Hyde Pioneer 11-Red Spot-Radio Waves from Earth 216
POINTS ARISING
PE. Orion-P.E. Minisonic 3-Digital Leaf-Marine Speedometer 220
NEWS BRIEFS
New Loudspeaker-New Year Award-Ipswich News 233
MARKET PLACE
Loudspeaker Kit, P.E. Orion! Digital Leaf and New Transistors 234
BOAT SHOW '75
Electronics for the mariner at this year's show 239
ELECTROMUSE by Malcolm Pointon
Setting-up and composing electronic music 241
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 245
PATENT REVIEW
Thought provoking ideas on file at the British Patents Office 248
READOUT More on Boolean breakfast 249
SPECIAL FREE DATA SHEET INSIDE THIS ISSUE
IC. IDENTICHART An easy-to-read directory of over 450 integrated circuits
CEEFAX and ORACLE Part 2 of this article will appear next month
Our April issued will be published on Friday, March 14, 1975
VOLUME 11 No. 4 APRIL 1975
CONSTRUCTIONAL PROJECTS
P.E. COMPENSATED PHOTO TIMER by K. Lenton-Smith
For accurate colour and monochrome printing 292
ESP DETECTOR by R. J. Johnson
An aid to paraphysical exploration 312
LOGIC INDICATOR PROBE by W. H. Davies
Logic checking with visual readout 318
MUSICAL DOORBELL by C. J. Allen
Welcome your caller with "Beethoven's 9th" 328
GENERAL FEATURES TRANSDUCERS-1 by P. P. Allcock
An introduction to transducers, their operation, types and uses - 300
INGENUITY UNLIMITED
Voltage Controlled Dimmer 320
CEEFAX and ORACLE-2 by J Smith
This concluding article examines some of the more detailed provisions of the system 322
NEWS AND COMMENT
EDITORIAL-Vital links 291
NEWS BRIEFS
New Loudspeaker-DICE Conversion-Portable Heart Monitor-Another Component Source 299,333
SPACEWATCH by Frank W. Hyde
The Potato Moon-Helios 307
STRICTLY INSTRUMENTAL by K. Lenton-Smith
Electronics and Music 308
P.E. KIT REVIEW
Building the Sinclair Scientific Calculator 311
POINTS ARISING
Marine Speedometer-P.E. Minisonic-Gas Detectors 333
MARKET PLACE
Digital Tutor, Pocket Multimeter and Professional Microphone 335
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 338
PATENTS REVIEW
Thought provoking ideas on file at the British Patents Office 339
Our May issue will be published on Friday, April 11, 1975
VOLUME 11 No. 5 MAY 1975
CONSTRUCTIONAL PROJECTS
P.E. JOANNA-1 by A. J. Boothman
A multiple-voiced instrument with touch-sensitive keying 334
TOUCH TUNING UNIT by R. J. Bonfield
Auto-touch-tuning for the P.E. Varicap Tuner 392
CAR INDICATOR/EMERGENCY FLASHER by J. H. Dance
Single-chip auxiliary car flasher for negative earth vehicles 410
I-C. PULSE GENERATOR by A. C. Ainslie
Versatile design for a t.t.l.-compatible variable frequency pulse source 414
GENERAL FEATURES
NEW DEVICES ... APPLICATIONS
Ultrasonics in TV remote control applications 398
LOUDSPEAKER BREAKTHROUGH
An old idea made possible using mpdern techniques 400
TRANSDUCERS-2 by P.R. Allcock
Thermometers and Strain Gauges 404
HIGH INPUT IMPEDANCE TECHNIQUES by A. A. Penfold
Obtaining high input impedances with modern semiconductors 420
INGENUITY UNLIMITED
Telephone Bell Synthesiser-Two-wire Signalling System-Counter SystemSeven-segment To BCD Decoder-Sound Switch/Trigger-TTL Oscillator 425
NEWS AND COMMENT
EDITORIAL-Discordant Voices 333
SPACEWATCH by Frank W. Hyde
1915 Space Programme 391
NEWS BRIEFS
Radio System-Hot Wind-Symbol for Safety-Scramblers Abroad-Tubeless Cameras 397,421 BOOK REVIEWS Selected new books we have received 403
MILD & BITTER by A.P.S.
The Calculator Bore 413
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 422
PATENTS REVIEW
The EEC industrial property law and its effect on British Patents 430
READOUT
A selection of readers' letters 431
Our June issue will be published on Friday, May 9, 1975
VOLUME 11 No. 6 JUNE 1975
CONSTRUCTIONAL PROJECTS
SYSTEMS MONITOR by L. J. Bell
Comparator circuit monitoring explained with the aid of a car system monitor 470
P. E. JOANNA-2 by A. J. Bobthman
Building the power supply and master tone generator 414
REACTION TIMER by C. R. Masson
Check your reaction time to the millisecond 492
ELECTRONIC MULTIMETER by D. E. Creocker
The complete high impedance multimeter from basics to finished item 497
GENERAL FEATURES
TRANSDUCERS-3 by P. A. Allcock
First section on the inductive transducer 483
SYMBIOSIS-1 by M. Pointon
A unique work composed for the P. F. Minisonic 488
INGENUITY UNLIMITED
Cutting Loudspeaker Baffles-Random Flashing Display 509
NEWS AND COMMENT
EDITORIAL-A Good Reference 469
SPACEWATCH by Frank W. Hyde
The Russian Science Programmes 480
MARKET PLACE
Live Rhythms, New Calculators, Theatre Mixers, Printed Circuit Kit 506 INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 510
READOUT
Selection of readers' letters 513
MILD & BITTER by A.P.S.
Can we afford to be educated 514
ALSO WITH THIS ISSUE
INDEX for VOLUME 10
January to December 1974 Between pages 490/491
Our July issue will be pubUshed on Friday, June 13, 1975
VOLUME 11 No. 7 JULY 1975
CONSTRUCTIONAL PROJECTS
P.E. PORTABLE GAS IGNITOR by P. Bullen
Ignite town, bottle and natural gas with this simple project 552
GUITAR EFFECTS PEDAL by A. Gwinn
Eight variable sound treatments in one unit 559
P.E. JOANNA-3 by A. J. Boothman
Envelope generation systems 572
SINE/SQUARE WAVE SIGNAL GENERATOR by J. Smith
General purpose at, test instrument 582
GENERAL FEATURES
TRANSDUCERS-4 by P.R. Allcock
Concluding section on the inductive transformer 562
INGENUITY UNLIMITED
Tunnel Diode B.F.O./I.F. Marker-Adding Circuit-Random Number Generator-Desoldering Components 567
SYMBIOSIS-2 by M. Pointon
Concluding article on composing with the P.E. Minisonic 578
NEW DEVICES... APPLICATIONS
Solid-state power control 580
NEWS AND COMMENT
EDITORIAL-An Indiscriminate Tax 551
NEWS BRIEFS
Electronics For School Teachers-Queen's Award 557
SPACEWATCH by Frank W. Hyde
A new X-ray source 558
MARKET PLACE Interesting new products and a VAT, announcement 571
POINTS ARISING
Ultrasonic Intruder Alarm-Light Pipe-Thermometer/Controller 576
INDUSTRY NOTEBOOK A look at the American scene 589
PATENTS REVIEW
Thought provuking ideas on file at the British Patent Office 590
READOUT A selection of readers' letters 593
Our August issue will be published on Friday, July II, 1975
VOLUME 11 No. 8 AUGUST 1975
CONSTRUCTIONAL PROJECTS
TV SOUND SEPARATOR by D.S. Gibbs & L M. Shaw
Improve the quality of your television sound 630
DIGITAL CLOCK by A. J. Sutton
A 12 or24 hour unit with a large easy-to-read display 636
P.E. JOANNA-4 by A. J. Boothman
Circuits and construction of the voice filters 650
8-CHANNEL LOGIC TRACE MULTIPLIER by A. C. Ainslie
Eight channels of logic information displayed on an oscilloscope 664
GENERAL FEATURES
SEMICONDUCTOR UPDATE by D. W. Coles
A review of interesting devices 644
TRANSDUCERS-5 by P. R. Allcock
Considering piezoelectricity and its applications 647
THE TRANSISTOR AS A ZENER by I.D. Evans
Making use of the Zener effect in transistors 660
INGENUITY UNLIMITED
Heads or Tails-Display for Digital Alarm Clock-Fuzz Effect-Coin Tosser-Versatile Flasher/Pulser 670
NEWS AND COMMENT
EDITORIAL-Victims of V.A.T. 629
NEWS BRIEFS
Tifax-Oh Buoy-Tigerfish-Disappearing handmark 674
SPACEWATCH by Frank W. Hyde
Mercury Fly-Past 635
STRICTLY INSTRUMENTAL by K. Lenton-Smith
Electronics and music 643
LONDON ELECTRONIC COMPONENT SHOW
Some of the highlights of the 1915 show 658
BOOK REVIEWS
Selected new books we have received 634
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 677
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 678
Our September issue will be published mid-August, 1975
VOLUME 11 No. 9 SEPTEMBER 1975
CONSTRUCTIONAL PROJECTS
TIME LAPSE PHOTOGRAPHY by D. J. Bonfield
Comprehensive aid to special effects photography 112
DIGITAL l.C. TESTER by W. H. Davies
A quick method of testing TTL logic 722
8-CHANNEL LOGIC TRACE MULTIPLIER by A. C. Ainslie
Construction and setting-up 731
P.E. JOANNA-5 by A. J. Boothman
This final article deals with cabinet, board interwiring, power amplifier and fault finding 738
GENERAL FEATURES
SEMICONDUCTOR UPDATE by D. W. Coles
A review of interesting devices 728
INGENUITY UNLIMITED
F.M. Centre Tuning Meter-Two Function A/C Coder 746
TRANSDUCERS-6 by P. R. Allcock Concluding article covers opto-electronic devices 748
NEWS AND COMMENT
EDITORIAL-Private Innovators 711
SPACEWATCH by Frank W. Hyde
Mars-New Comet-Venus Probe-Biological Links With Space 721
MARKET PLACE
New products and a special offer to readers 737
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 745
PATENTS REVIEW
Thought provoking ideas on file at the British Patent Office 747
FREE ENTRY COMPETITION
HOW INVENTIVE ARE YOU?
Your chance to win a Big Cash Prize 718
Our October issue will be published on Friday, September 12, 1975
(for details of contents see page 720)
VOLUME 11 No. 10 OCTOBER 1975
CONSTRUCTIONAL PROJECTS
P.E. ENGINE ANALYSER by D. Haley
Provides most of the needs for the economy minded motorist 796
DIGITAL WRISTWATCH
Assembling the Sabchron LED. wristwatch 802
ENVELOPE SHAPER by E. P. Flint
A simple-to-build shaper with full ADSR facilities 810
CONSTANT CURRENT LOAD
A loading unit for power units and amplifiers 825
LIGHT MODULATION UNIT by S. R. Beeching
A two-channel sound to light effects system 828
GENERAL FEATURES
SEMICONDUCTOR UPDATE by D. W. Coles
A review of interesting devices 812
MICROPROCESSORS-1 by V. E. Yates
A detailed look into this important new technology 816
INGENUITY UNLIMITED
Car Alarm-Simple Timer-Pulse Generator-Frequency Doubler-VCO Circuit-Short Circuit Protection-Signal Indicator with Memory 834
NEWS AND COMMENT
EDITORIAL-Micro Master Minds 795
NEWS BRIEFS
A Stitch in Time-TV Innovations-Going Dutch-Talking to Computers-Solar Cells-British Instrumentation 806,843
SPACEWATCH by Frank W. Hyde
Earthquakes-Soviet Activities 809
INTERNAVEX '75
Some of the highlights of this years Audio/Visual show 815
APRS '75
A report on the Association of Professiunal Recurding Studios exhibition 821
BOOK REVIEWS
Selected new books we have received - 823,832
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 833
PATENTS REVIEW
Looking at Car Mirror Defrosting and a Rescue Transmitter/Receiver 841
READOUT
A selection of readers' letters 842
FREE ENTRY COMPETITION
HOW INVENTIVE ARE YOU?
Your last chance to win a Big Cash Prize 822
SPECIAL FREE DATA SHEET INSIDE THIS ISSUE
LINEAR IC. IDENTICHART
At-a-glance functional equivalents of linear i.c.s.
Our November issue will be published on Friday, October 10, 1975 (for details of contents see page 824)
VOLUME 11 No. 11 NOVEMBER 1975
CONSTRUCTIONAL PROJECTS
ELECTRONIC TUNING FORK by P. W. Busby
Tuning aid for musical instruments 882
P.E. ENGINE ANALYSER-2 by D. Haley
Construction of the dwell and tachometer board 890
P.E. MINIMIX 6-I by G. D. Shaw
The first part of a six channel, stereo mixer 904
SIMPLE LIGHT COMPARATOR by C. C. Whitehead
A low cost enlarger aid for the amateur photographer 910
MAINS OPERATED 9V UNIT by C. H. Banthorpe
A simple transformerless battery substitute 914
GENERAL FEATURES
SEMICONDUCTOR UPDATE by D. W. Coles
A review of interesting devices 896
MICROPROCESSORS-2 by V. E. Yates
A detailed look into this important new technology 899
INGENUITY UNLIMITED
Music Generator-Triffid Power Supply-Logic CheckerElectrolytic Tester - 925
NEWS AND COMMENT
EDITORIAL-A Compelling Force 881
SPACEWATCH by Frank W. Hyde
Ice ages-Life in the Universe 889
PATENTS REVIEW
Protecting Ideas-Fusible Link-Move Monitor 908
INDUSTRY NOTEBOOK by Nexus
What's Happening inside industry 918
BRITISH MUSICAL INDUSTRIES TRADE FAIR by G. Godbold
A look at some of this year's exhibits 921
READOUT
A selection of reader's letters 929
Our December issue will be published on Friday, November 14, 1975
VOLUME 11 No. 12 DECEMBER 1975
CONSTRUCTIONAL PROJECTS
IC50 GUITAR AMPLIFIER by B. W. Terre/I C. F. TerrelI
50W two-channel mono amplifier for guitars 970
UNIVERSAL THERMOSTAT by A, A. Dix
A cheap and simple thermostat with many applications 974
CHRISTMAS LIGHTS FLASHER by J. N. Walt
Random interference-free flasher for Christmas trees or shop window displays 983
P.E. ENGINE ANALYSER-3 by D. Haley
Ignition timing circuit and using the instrument 990
PE. MINAMIX 6-2 by G. D. Shaw
Final part for constructing this six channel stereo mixer 998
GENERAL FEATURES SEMICONDUCTOR UPDATE by D. W. Coles
A review of interesting devices 978
INGENUITY UNLIMITED
Multi-purpose Generator-V.C.O. Programmer-Simple Up-Down Counter-Clock Mod 979 NEWS AND COMMENT
EDITORIAL-Time for Change? 969
POINTS ARISING
Envelope Shaper-Light Modulation Unit-Electronic Tuning Fork 976
SPACEWATCH by Frank W. Hyde
New nova-Tungus meteorite-Russian Moon Satellite 977
STRICTLY INSTRUMENTAL by K. Lenton-Smith
Electronic music matters 994
INDUSTRY NOTEBOOK by Nexus
What's happening inside industry 1006
MARKET PLACE
Interesting new products 1009
READOUT
A selection of readers' letters 1010
INDEX FOR VOLUME 11 1013
Our January issue will be published on Friday, December 12, 1975 (for details of contents see page 995)
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