VOLUME 12 No. 1 JANUARY 1976 CONSTRUCTIONAL PROJECTS ROAD-ICE WARNING INDICATOR by A. M. Owen A simple early warning device for monitoring driving conditions 22 IC50 GUITAR AMPLIFIER-2 by B. W. TerrelI & C. F. TerrelI This concluding article deals with construction and testing 25 DIGITAL LOGIC CHECKER by D. Coles A visual in-circuit pocket logic checker 52 AUDIO COMPRESSOR by S. Whitt Obtain better recordings with this inexpensive unit 56 RANDOM TONE GENERATOR by W. 0. Ross An electronic doorbell which can provide a variety of tunes at the press of the door switch 58 GENERAL FEATURES INGENUITY UNLIMITED Headlight Dimmer-Skin Resistance Indicator-Random Generator-Sawtooth Generator Sequencing Oscillator-Output Meter-Simple Lights Flasher-Temperature Sensing DeviceTime Switch-Voltage Controlled Zener-Lights-on Reminder-Voice Operated Fader Modifications-Dwell Meter Modifications 35 USING CMOS DIGITAL I.C.s-1 by D. B. Johnson-Davies & A. M. Marshall An introductory course to operating principles, practical guidance and experimental circuits for this fast moving technology 44 SEMICONDUCTOR UPDATE by D. W. Coles 48 A review of interesting devices NEWS AND COMMENT EDITORIAL-Small Mercies 21 SPACEWATCH by Frank W. Hyde Jodrell Bank-Black Holes and White Holes 31 BOOK REVIEWS Selected new books we have received 32 MARKET PLACE Interesting new products 42 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 55 NEWS BRIEFS Viewdata Service-IERE Golden Jubilee 60,62 POINTS ARISING Light Modulation Unit 62 PATENTS REVIEW Tape Noise Reduction-Electrostatic Loudspeaker-Patent News 65 READOUT A selection of readers' letters 66 Our February issue will be published on Friday, January 9, 1976 (for details of contents see page 49) VOLUME 12 No. 2 FEBRUARY 1976 CONSTRUCTIONAL PROJECTS PROGRAMMABLE WASH/WIPE CONTROLLER by 0. W. Lee A car wiper delay unit with a difference 112 SOIL SATURATION METER 0. W. Lloyd A simple electronic answer to green fingers 116 CAR/CARAVAN CLOCK by M. Fischer A crystal controlled clock with some unusual extra facilities 130 OPTO COUPLED REV COUNTER by D. S. Bradbury 0-25,000 r.p.m. meter for aeromodellers 144 GENERAL FEATURES USING CMOS DIGITAL l.C.s-2 by 0. B. Johnson-Davies & A. M. Marshall The transmission gate; logic gates; part numbering systems; the quad analogue switch 123 SEMICONDUCTOR UPDATE by D. W. Coles A look at some recently released devices 143 INGENUITY UNLIMITED Surround Sound Matrix-White Noise Generator-Simple Touch Switch-Better Figures-Night Light-Car Theft Alarm-Audio Signalling-Cycle Lighting Control-Charger for NickelCadmium Cells-"Instant" Digital Stop Watch Conversion 150 NEWS AND COMMENT EDITORIAL-Excommunication 111 SPACEWATCH by Frank W Hyde Details from the Venus probe 120 NEWS BRIEFS Calculators for the Blind-Sky Communications 126 MARKET PLACE Some interesting new products 129 POST OFFICE RESEARCH CENTRE A look at some of the work being done at the new centre 142 BOOK REVIEWS Selected books we have received 148 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 149 PATENTS REVIEW Thought provoking ideas on file at the British Patent Office 159 READOUT A selection of readers' letters 160 Our March issue will be published on Friday, February 13, 1916 (for details of contents see page 119) VOLUME 12 No. 3 MARCH 1976 CONSTRUCTIONAL PROJECTS SYNCHRONOME by A.Briar An accented-beat metronome for duple, triple and quadruple rhythms 198 PEAK LEVEL INDICATOR by J. T. Tiernan A useful recording accessory which gives a fast-acting indication of overload 203 TOTAL HARMONIC DISTORTION FILTER by R. A. Pen fold Allows measurement of t.h.d. at 100Hz and 1kHz 216 CAR/CARAVAN CLOCK by M. Fischer Mains conversion and circuits for controller and latch 225 GENERAL FEATURES USING CMOS DIGITAL I.C.s-3 by D. B, Johnson-Davies & A. M. Marshall Gate packages, driving circuits and latches 206 SEMICONDUCTOR UPDATE by D. W. Coles A look at some recently released devices 224 INGENUITY UNLIMITED TV Sound Adaptor-B.F.O.-Touch Switch-Stereo Preamplifier-Light Switch and Motor DriverLow Voltage Regulator-Car Fuse Monitor-Combination Lock-Autotone Mk 2 234 NEWS AND COMMENT EDITORIAL-The Old Order Changeth - 197 SPACEWATCH by Frank W. Hyde To Mars by Viking . 212 KIT REPORT Construction and assessment of the Sinclair "Black Watch" 220 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 222 PRODUCT REVIEW A review of the recently released Hewlett Packard 3476A/B Digital Multimeter 243 READOUT A selection of readers' letters 244 SPECIAL P.E. PUBLICATION SOUND DESIGN-Coming soon, details on page 215 Our April issue will be published on Friday, March 12, 1976 (for details of contents see page 223) VOLUME 12 No. 4 APRIL 1976 CONSTRUCTIONAL PROJECTS P.E. DIGI-PROBE by B, Cullen & P. W. Coles A logic state monitor with 3-state indication 288 ADSR ENVELOPE SHAPER by P.R. Williams An ADSR design which includes a VCA 293 D.C. MILLIVOLTMETER by H. T. Kitchen Uses operational amplifier techniques to achieve good sensitivity and high input impedance 305 SHOOT by P. Adams Challenge your reaction time with this ingenious game 318 GENERAL FEATURES USING CMOS DIGITAL l.C.s-4 by D.B. Johnson-Davies & A. M. Marshall 300 Linear applications and circuits for a tachometer and an oscilloscope trace doubler TIME CONSTANTS by 0. Maynard A look into this sometimes confusing subject 309 INGENUITY UNLIMITED Electronic Flasher-Patch Board-Transistor Tester-Electronic Dice-Car Battery Condition Indicator-Frequency Changer-Relay Operation-BCD to 7-Segment Decoder-Tuning IndicatorCar Alarm-Sound to Light Modulator-7-Segment to BCD Encoder-Auxiliary Power SupplyThyristor Windscreen Wiper Delay 324 NEWS AND COMMENT EDITORIAL-Order in The Ranks 287 SPACEWATCH by Frank W. Hyde Helios 2-Target Saturn-The Sun-China 296 HOW INVENTIVE WERE YOU? A report from the judges of the Plessey/P.E. competition 299 SEMICONDUCTOR UPDATE by P. W. Coles A look at some recently released devices 313 NEWS BRIEFS Digital Watches-IBA Handbook-BS9000 314 MARKET PLACE Interesting new products 322 STRICTLY INSTRUMENTAL by K. Lenton-Smith Electronic music matters 323 PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 335 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 336 SPECIAL 8-PAGE SUPPLEMENT SOUNDS EXTRAORDINARY An account of the many different electronic effects used in music today 1-8 Our May issue will be published on Friday, April 9, 1976 (for details of special free piece of Veroboard and other contents, see page 315) VOLUME 12 No. 5 MAY 1976 CONSTRUCTIONAL PROJECTS DIGITAL FREQUENCYMETER by A. J. Buxton Gives digital readout of frequency measurement of up to 500MHz 376 ADD-ON CAPACITANCE UNIT by R. W. Lawrence Direct measurement of capacitance on your multimeter. Can be built on the free printed wiring board provided with this issue. 390 AUDIO COMPASS by M. Kenward An off-course alarm for use on self-steered yachts and power craft. Allows ears to replace eyes when steering a compass course at night 394 COMPUTER VOICE byE. A. Parr Generates those "Dalek-type voice effects 406 GENERAL FEATURES USING CMOS DIGITAL l.C.s-5 by D.B. Johnson-Davies & A. M. Marshall Electronic switches and oscillators 384 SEMICONDUCTOR UPDATE by P. W. Coles A look at some recently released devices 404 HELLS, BELLS AND DECIBELS by D.Maynard Ever get confused about dB's? This article helps clarify the subject 411 INGENUITY UNLIMITED Multiple Octave Organ-Time Switch-Burglar Alarm-Frequency Divider-Indicator for Discotheque PFL System-Light-on Indicator-Courtesy Light Timer-Dual Fade for Slide Presentation-Low Voltage Indicator-Car Alarm-Recording Level Indicator-Touch Keyboard 413 NEWS AND COMMENT EDITORIAL-Under-Sold? 375 NEWS BRIEFS Summer School 382 BOOK REVIEWS Selected books we have received 382 POINTS ARISING How Inventive Competition-Digi-Probe-Opto-Coupled R.P.M. Meter 382 SPACEWATCH by Frank W. Hyde Soviet Venus Probes-Powersat-Set Backs 383 MARKET PLACE Interesting new products 410 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 412 PATENTS REVIEW Latest patent information including price increase 424 * FREE WITH THIS ISSUE - PRINTED WIRING BOARD Our June issue will be published on Friday, May 14, 1916 (for details of contents, see page 405) VOLUME 12 No. 6 JUNE 1976 CONSTRUCTIONAL PROJECTS RALLY MILOMETER by P. Leah Designed to aid navigation and map reading on car rallies 484 AUDIO MILLIVOLTMETER by R. A. Penfold An essential piece of test gear in the design of audio equipment 476 PROPORTIONAL RADIO CONTROL-1 by D. J. Whiteley A 9-channel 27MHz system with options of proportional or switched control on each channel. This month the transmitter and coder 484 DIGITAL FREQUENCY METER-2 by A. J. Buxton This final article deals with construction, a high impedance input buffer and a vhf. prescaler 499 GENERAL FEATURES USING CMOS DIGITAL I.C.s-6 by D. B. Johnson-Davies & A. M. Marshall Retriggerable monostables, digital filters and three-state output devices 470 SEMICONDUCTOR UPDATE by A. W. Coles A look at some recently released devices 492 INGENUITY UNLIMITED Digital Calendar-Electronic Doorbell-lrregular Waveform Production-Square Wave Generator 494 NEWS AND COMMENT EDITORIAL-Rising to the Challenge-A Welcome Cut 483 NEWS BRIEFS Quad Achievements-Night Attack Missile-New Exchange-Army on the Air 472-489 SPACEWATCH by Frank W. Hyde Space Telescope-Space Traffic Jam?-Note for Posterity 475 READOUT A reader's protest 499 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 510 PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 512 COMPETITION How inventive are You? A LIST OF PRIZE WINNERS 490 Our July issue will be published on Friday, June II, 1976 (for details of contents, see page 493) VOLUME 12 No. 7 JULY 1976 CONSTRUCTIONAL PROJECTS CAR INTRUDER ALARM by J. Haggis Sounds the horn intermittently if doors, boot or bonnet are opened 548 P.E. DIGISCOPE by R. W. Coles B. Cullen A hand held, 1 MHz low voltage oscilloscope with an l.e.d. display 553 PROPORTIONAL RADIO CONTROL-2 by J. D. Whiteley A 9-channel 27MHz system with options of proportional or switched control on each channel. This month the Receiver, Interface and Decoder 568 FLUORESCENT LIGHT INVERTER by A. J. Bassett Allows large fluorescent tubes to be driven from a car battery without the need fora choke or starter 576 AUTO-STOP FOR MODEL RAILWAYS by E. A. Parr A design to halt a model train at stations for a predetermined time 580 GENERAL FEATURES SEMICONDUCTOR UPDATE by R. W. Coles A look at some recently released devices 558 USING CMOS DIGITAL I.C.s-7 by D. B. Johnson-Davies & A. M. Marshall The last in this series of basic CMOS digital devices 584 INGENUITY UNLIMITED Tacho Slave-Sound to Light System-Quiz Buzzer-Fuse Failure Warning-Electronic DiceDigital Model Control-Novel Memory 589 NEWS AND COMMENT EDITORIAL-A Powerful Combination 547 NEWS BRIEFS Cable Ship-Microprocessor Tutor 559 SPACEWATCH by Frank W. Hyde Solar Energy-Satcom Launches 560 PARIS COMPONENTS SHOW by D. Gibson News from the Continent 563 ALL ELECTRONICS SHOW by G. Godbold A look at one of the new London Spring collections 567 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 579 PATENTS REVIEW Extending patents-Why not a trademark?-Improved bass 583 POINTS ARISING P.E. Digi-Probe-Digital Frequency Meter 594 Our August issue will be published on Friday, July 9, 1976 (for details of contents, see page 573) . VOLUME 12 No. 8 AUGUST 1976 CONSTRUCTIONAL PROJECTS GUITAR OVERDRIVE UNIT by J. D. Rogers Get those overdriven amplifier sounds with this versatile effects unit 626 PROPORTIONAL RADIO CONTROL-3 by J. D. Whiteley Details of the Servo Amplifier, Servo Drive and Relay Drive sections 630 POCKET TIMER by M. Plant A portable interval timer with many applications 648 KARNAUGH MAP DISPLAY by C. Cartlidge A logic laboratory accessory 652 P.E. DIGISCOPE-2 by R. W. Coles & B. Cullen Remaining electronic circuitry of upper boarcd together with constructional details 58 GENERAL FEATURES INGENUITY UNLIMITED Pulse Generator-F.E.T. Voltmeter-Rise Time Speed-up-Touch Switch-Better DiáplayTouch Tuner-Logic Probe 644 SEMICONDUCTOR UPDATE by R. W. Coles A look at some recently released devices 665 RELAXATION OSCILLATOR CIRCUITS by P. Yap Some applications of the complementary astable multivibrator 669 NEWS AND COMMENT EDITORIAL-Down To The Sea 625 SPACEWATCH by Frank W. Hyde Jupiter's Tail-Laser Satellite-Soviet Telescope-Solar Energy 636 IEA-ELECTREX SHOW by G. Godbold Some exhibits seen at Birmingham's N.E.C. 639 MULLARD RESEARCH LABORATORIES A review of some current work 643 BOOK REVIEWS Selected books we have received 647 STRICTLY INSTRUMENTAL by K. Lenton-Smith Electronic music matters 657 MARKET PLACE Interesting new products 666 NEWS BRIEFS British Amateur TV Club-Wireless Museum-British Amateur Electronics Club 670 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 673 PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 674 Our September issue will be published on Friday, August 13, 1976 (for details of contents, see page 651) . VOLUME 12 No. 9 SEPTEMBER 1976 CONSTRUCTIONAL PROJECTS CROSS-HATCH GENERATOR by A. A. Birch A self-contained instrument providing a uh.f. signal for TV fault finding and adjustment 708 RADIO CONTROL SYSTEM by J. D. Whiteley Full constructional details for a multi-channel on/off system based on tone coding 716 GAS/SMOKE DETECTOR by M. D. Page Invaluable fire alarm/smoke and gas detector for the house, boat or caravan 728 P.E. DIGISCOPE-3 by R. W. Coles & B. Cullen Lower deck circuitry and constructional details 736 LIGHT-UP ALARM by M. Plant Don't be a danger to yourself and others on the road: make sure you "light up" at the right time with this simple alarm 742 GENERAL FEATURES SEMICONDUCTOR UPDATE by R. W. Coles A look at some recently released devices 723 CITIZENS' BAND by Pat Hawker The pros and cons of radio communications for the man in the street (and his family) 731 INGENUITY UNLIMITED Heads/Tails Indicator-Square Wave Converter-Simple Servo-Sound-to-Light ConverterImproved Phaser Control-Light Pipe Controller-Sidelight Alarm-Rear Windscreen Wiper Controller-Seat-Belt Alarm-Car Cassette Power Supply 746 NEWS AND COMMENT EDITORIAL-Tapping the Glass 707 SPACEWATCH by Frank W. Hyde Space Seeds-Salyut Research 720 HEDA SHOW REPORT by G. C. Arnold An impression of the Home Electronics section 724 PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 727 POINTS ARISING Shoot-Digital Frequency Meter-P.E. Digi-Probe 730 NEWS BRIEFS VAT Leaflet-Fog Bound-Microprocessor Symposium-Courses---Sonax Electronics - 733 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 734 Our October issue will be published on Friday, September 10, 1976 (for details of contents and special announcement, see page 735) . VOLUME 12 No. 10 OCTOBER 1976 CONSTRUCTIONAL PROJECTS CINE/TAPE SYNCHRONISER by N. V. Davies Keeping pictures and sound in step in your home movies 786 CASSETTE PLAYER POWER SUPPLY by H. T. Kitchen Cut battery costs wifh this short-circuit proof mains operated unit 790 STEREO DIGITAL PPM by R. W. Lawrence Light emitting diodes replace the conventional Peak Programme Meter movement in this novel design 808 P.E. DIGISCOPE-4 by R. W. Coles & B. Cullen Final constructional details and power supply circuitry 818 GENERAL FEATURES INTRODUCING WIRING PENS by B. Cullen User impressions of two models of this new constructional aid 794 INGENUITY UNLIMITED Telephone Bell Simulator-Simple Siren-Magnetic Cartridge Preamplifier-Two-channel Trace Multiplier-Staircase Generator-Heads & Tails-Digital Leaf-Guitar Presence BoosterDigital Frequency Meter-Logic Probe-TTL Touch Circuits-Digital Circuit TesterAnemometer 823 NEWS AND COMMENT EDITORIAL-Good measure 785 SPACEWATCH by Frank W. Hyde Mars The Friendly Planet 793 THE CLEAN ROOM New UK plant for MOS production 798 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 800 MARKET PLACE Interesting new products and a look at some new catalogues 803 PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 804 READOUT A selection of readers' letters 807 NEWS BRIEFS Marine Electronics Symposium-Tape Cassettes-Name Change for Novus - Amateur Convention-Courses 817,822 POINTS ARISING Proportional Radio Control System-Sound to Light System 822 FREE WITH THIS ISSUE COMPONENT WIRE BENDING GAUGE 792 SPECIAL P.E. OFFER News of a special soldering iron kit being offered in next month's issue 799 Our November issue will be published on Friday, October 8, 1976 (for details of contents, see page 817) VOLUME 12 No. 11 NOVEMBER 1976 CONSTRUCTIONAL PROJECTS P.E. ORION TUNER-1 by D. S. Gibbs & I. M. Shaw Circuit details, specifications and components list for this high performance design 868 HAZARD WARNING FLASHER by C. J. Coke, A simple design suitable for fitting to any car 874 DISCOSTROBE by A. Briar A four-channel light show controller offering a choice of three effects 888 CINE/TAPE SYNCHRONISER-2 by N. V. Davies Construction and operation, plus interface details for various projector types 896 GENERAL FEATURES SEMICONDUCTOR UPDATE by A. W. Coles & B. Cullen A look at some recently released devices 883 INGENUITY UNLIMITED Accenting Metronome-Programmable Logic Generator-Touch Dimmer-l5Hz Flasher"PIp'' Tone Generator-Counter-Patch Panel-Phase Comparator-Traffic Light Controls-Signal injector/Tracer 902 NEWS AND COMMENT EDITORIAL-How to succeed 867 NEWS BRIEFS Transatlantic Microprocessor Link - 873 READOUT A selection of readers' letters 876 BRITISH MUSICAL INSTRUMENT TRADE FAIR by G. Godbold A look at some of the latest trends from the music industry 878 SPACEWATCH by Frank W. Hyde Return to the Moon-Drought and the Sun 880 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 884 POINTS ARISING Cross-Hatch Generator-Digital Frequency Meter 887 BOOK REVIEWS Selected books we have received 887 VAT AND COMPONENTS The latest VAT information issued by H.M. Customs and Excise 914 SPECIAL P.E. OFFER A pre-release introductory soldering kit offer including the new Adcola safety approved iron. Exclusive to P.E. readers 877 Our December issue will be published on Friday, November 12, 1916 VOLUME 12 No. 12 DECEMBER 1976 CONSTRUCTIONAL PROJECTS METAL PIPE OR WIRING LOCATOR by C. C. Whitehead A simple safety aid for the D.l.Y. man 952 P.E. ORION TUNER-2 by D. S. Gibbs & I. M. Shaw Construction, testing and final adjustments 956 GAMES MACHINE by D.Burn A programmed random number generator - 969 BREAKDOWN TESTER by M. H. George Check Zener diode and transistor breakdown voltages with this mains-driven unit 977 GENERAL FEATURES GETTING TO GRIPS WITH MICROPROCESSORS by D. Brown Understanding and using these new devices 963 SEMICONDUCTOR UPDATE by R. W. Coles A look at some recently released devices 976 SOLID STATE TV CAMERAS by D. V. EddolIs A survey of developments 980 INGENUITY UNLIMITED Car Lamp Monitor-Simple Timer-Model Train Controller-LED. VU Meter-Quiz MonitorSimple Siren-Preset-to-One" Counter-Variable Chance Ratio Device-Voltmeter Impedance Multiplier-Tell Tale Alarm 987 NEWS AND COMMENT EDITORIAL-A Disingenuous Few 951 SERT SYMPOSIUM "MICROPROCESSORS AT WORK" An impression 965 SPACE WATCH by Frank W. Hyde Space Shuttle-Mars-Soyuz 22 966 NEWS BRIEFS TV Import Restrictions-Code of Practice-Overseas Symposium & Exhibition 984 MARKET PLACE Interesting new products 985 STRICTLY INSTRUMENTAL by K. Lenton-Smith Electronic music matters 986 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 993 PATENTS REVIEW Thought-provoking ideas on file at the British Patents Office 994 INDEX FOR VOLUME 1,2 Our January issue will be on sale on Friday, December 10, 1976 (for details of contents see page 955) |