VOLUME 21 No.1 JANUARY 1985 CONSTRUCTIONAL PROJECTS John M. H. Becker .. .. .. 10 Part One: Effects and circuit description CAR COMPUTER-Part 2 by S.H. Cousins BSc PhD and P. D. Wilson BEng .. .. .. 24 Construction, installation and setting-up NEPTUNE AND MENTOR ROBOTS by Richard Becker and Tim Orr . .. . .. 34 Part Five: Component list and p.c.b. layouts for Mentor RADAR SECURITY ALARM-Part 2 .. 49 Build this project and be secure-Improved transmitter design MICROCOMPUTER "WATCHDOG" TIMER by Tom GaskelI BA(Hons) CEng MIEE .. 61 Warning system for computers GENERAL FEATURES SEQUENTIAL LOGIC TECHNIQUES by M. Tooley BA and D. Whitfield MA MSc CEng MIEE .. 18 Part Four: Psuedo random numbers and shift registers LASERS AND HOLOGRAMS by Richard Barron 30 An enLiGHTening feature on LASERs and Holograms INGENUITY UNLIMITED .. .. .. .. .. .. .. 40 Readers' circuit ideas - video timer interface - wide range high current supply - bar-graph display - accented beat metronome - dual LED logic probe - electronic dice CELLULAR RADIO by Barry Fox .. .. .. .. .. .. .. 44 Direct-dialling from your car or handphone SEMICONDUCTOR CIRCUITS by Tom Gaskell BA (Hons) CEng MIEE .. 59 Programmable Delay Timer (LS7210) SPACEWATCH by Dr. Patrick Moore OBE .. .. .. .. .. 58 NEWS & COMMENT EDITORIAL 7 INDUSTRY NOTEBOOK .. 17 LEADING EDGE .. 64 NEWS & MARKET PLACE .. 8 SPECIAL OFFER .. .. 27 STRICTLY INSTRUMENTAL 66 VERNON TRENT .. 54 BAZAAR .. 16, 33 P.C.B. SERVICE .. 57 MICROBUS 67 THIS MONTHS COVER Internal 'anatomy' of the Stereo/Mono Chorus & Flanger project. Our inset photograph shows a British Telecom technician checking for Laser radiation emission. This month's article, LASERS & HOLOGRAMS explains how they are created and what they are used for. OUR FEBRUARY ISSUE WILL BE ON SALE FRIDAY, JANUARY 4th, 1985 (see page 28) VOLUME 21 No. 2 FEBRUARY 1985 CONSTRUCTIONAL PROJECTS MODULAR AUDIO POWER SYSTEM-Part 1 by M. Tooley BA and D. Whitfield MA MSc CEng MIEE.. 10 Main power amp module SPECTRUM DAC/ADC BOARD by R. A. Penfold .. .. .. .. .. .. .. .. 15 Interface board for control applications MICROPROCESSOR CONTROLLED D.C. MOTOR DRIVERS by Tom GaskelI BA(Hons) CEng MIEE.. 31 Enables analogue driving of d.c. motors SIGNAL GENERATOR & F-V CONVERTER by John M. H. Becker .. .. .. .. .. 34 Quality test instrument NEPTUNE AND MENTOR ROBOTS by Richard Becker and Tim Orr .. .. .. .. .. 49 Part Six: Commissioning and testing of Neptune MONO/STEREO CHORUS & FLANGER by John M. H. Becker .. .. .. .. .. .. 59 Part Two: Construction and setting up GENERAL FEATURES MICROWRITER by Tom Gaskell BA(Hons) CEng MIEE .. .. .. .. .. .. 22 An ingenious six-key alternative to the QWERTY keyboard SEMICONDUCTOR CIRCUITS by Tom Gaskell BA (Hons) CEng MIEE .. .. .. .. .. 28 Power Op-Amps TCA 365 and TCA 2365) SPACEWATCH by Dr. Patrick Moore OBE .. .. .. .. .. .. .. .. 40 INGENUITY UNLIMITED .. .. .. .. .. .. .. .. .. .. 42 Readers circuit ideas - thermistor thermometer - logic recorder - zx spectrum buffered input port (6 bit) - DIN lead tester SEQUENTIAL LOGIC TECHNIQUES by M. Tooley BA and D. Whitfield MA MSc CEng MIEE .. .. 55 Part Five: Data multiplexers NEWS & COMMENT EDITORIAL .. 7 BAZAAR .. 18, 48 MICROBUS .. .. 65 NEWS & MARKET PLACE .. .. 8 INDUSTRY NOTEBOOK .. 21 VERNON TRENT .. 67 LEADING EDGE .. 25 P.C.B. SERVICE .. 68 THIS MONTH'S COVER-.. Our cover photograph shows silicon wafers in a furnace during the production of integrated circuits. Photograph courtesy of National Semiconductor. OUR MARCH ISSUE WILL BE ON SALE FRIDAY, FEBRUARY 1st, 1985 (see page 4l) VOLUME 21 No.3 MARCH 1985 CONSTRUCTIONAL PROJECTS HEART BEAT MONITOR by P. Leah 10 Digital readout of your heart beat AUTO SHUT-DOWN MULTIPLE REGULATOR by Tom Gaskell BA (Hons) CEng MIEE .. .. 18 Monitor system for a three rail power supply LOW COST BBC SPEECH SYNTHESISER by A. Foord .. .. .. 31 Effective speech synthesis for the Beeb MODULAR AUDIO POWER SYSTEM-Part 2 by M. Tooloy BA and D. Whitfield MA MSc CEng MIEE.. 40 Dummy Load; Pre-amp; Mixer and Tone Controls NEPTUNE AND MENTOR ROBOTS by Richard Becker and Tim Orr .. .. .. 48 Part Seven: Commissioning and testing of Mentor GENERAL FEATURES SEMICONDUCTOR CIRCUITS by Tom Gaskell BA(Hons) CEng MIEE .. 17 Quad Supply and Line Monitor (UC 3903) MARS ELECTRONICS by Richard Barron .. .. .. .. .. .. 22 Computer applications and control in industry INGENUITY UNLIMITED .. .. .. . .. .. .. 26,50 Readers' circiut ideas - shop counter bell - electronic seismograph BBC MICRO FORUM by D. Whitfield MA MSc CEng MIEE .. .. .. 36 A scintillating cauldron of new ideas for BBC wizards SPACEWATCH by Dr. Patrick Moore OBE .. 52 SEQUENTIAL LOGIC TECHNIQUES by M. Tooley BA and D. WhitfieldMA MSc CEng MIEE .. 54 Part Six: De-.multiplexing and time domain multiplexing NEWS & COMMENT EDITORIAL 7 BAZAAR 16 INDUSTRY NOTEBOOK 59 NEWS & MARKET PLACE 8 SPECIAL OFFER 28 P.C.B. SERVICE 60 LEADING EDGE 39 OUR APRIL ISSUE WILL BE ON SALE FRIDAY, MARCH 1st, 1985 (see pege 35) VOLUME 21 No. 4 APRIL 1985 CONSTRUCTIONAL PROJECTS POWER CONTROL INTERFACE by R. A. Penfold .. 10 Proportional mains control up to 10A DISC DRIVE PSU hby J. R. W. Barnes - 18 Power for second BBC disc drive MODULAR AUDIO POWER SYSTEM-Part 3 by M. Tooley BA and D. Whitfield MA MSc CEnq MIEE -. 23 Powersupply and test signal source RUGBY CONTROLLED CLOCK-Part 1 by Stephen Ibbs 47 A receiver and decoder for the Rughy time signal POWER SUPPLY WATCHDOG by Tom GaskeII BA(Hons) CEng MIEE 58 An over and under voltage warning system GENERAL FEATURES SEQUENTIAL LOGIC TECHNIQUES by M. Tooley BA and D. Whitfield MA MSc CEng MIE - 14 Part Seven: Binary full adders index to the series SPACEWATCH by Dr. Patrick Moore OBE 28 PRINTER BUYER'S GUIDE 30 An introduction to printer specifications plus a comprehensive buyer's guide BBC MICRO FORUM by D. Whitfield MA MSc CEng MIEE 40 A scintillating cauldron of new ideas for BRC wizards SEMICONDUCTOR CIRCUITS by Tom Gaskell BA(Hons) CEng MIEE 56 Programmable voltage detectors ICL8211CPA and ICL8212CPA NEWS & COMMENT EDITORIAL .. 7 SPECIAL OFFER .. 26 INDUSTRY NOTEBOOK .. 52 NEWS & MARKET PLACE .. 8 BAZAAR .. 29 VERNON TRENT .. 54 LEADING EDGE .. 44 P.C.B. SERVICE .. 60 This month's cover shows a digitised photograph, designed and created by Alex Kempkens, of a National Semiconductor 32-bit microprocessor. The Series 32000 Family from National includes the first commercially available 32-bit c.p.u. OUR MAY ISSUE WILL BE ON SALE FRIDAY, APRIL 4th, 1985 (see page 43) VOLUME 21 No.5 MAY 1985 CONSTRUCTIONAL PROJECTS AMSTRAD SYNTHESISER INTERFACE by H. A. Penfold .. .. .. .. 10 1000 note, 5 octave sequencer-computer project STEREO NOISE GATE & VCA by John M. H. 8ecker .. .. .. .. 14 Reduces noise for musicians and home studio recording REMOTE SENSING THERMOMETER by Tom Gaskell BA(Hons) CEng M!EE .. .. .. . 22 A 3.5 digit electronic thermometer TELEPRINTER INTERFACE by B. Drake . . . . . . . . . . . . . . . 26 Low cost letter quality prints from your computer CYLINDER THERMOSTAT by Mark Stuart .. .. .. .. .. .. .. .. .. 38 Enables economic use of hot water system RUGBY CONTROLLED CLOCK-Part 2 by Stephen Ibbs . . . . . . . . . . . . 53 Construction and setting up procedures GENERAL FEATURES SEMICONDUCTOR CIRCUITS by Tom Gaskell BA(Hons) CEng M!EE . . .. .. .. .. 19 Temperature sensor (LM35) SPACEWATCH by Dr. Patrick Moore OBE .. .. .. .. .. .. .. .. . 24 ELECTRONICS AT THE BBC by Chris Kelly .. .. .. .. .. .. .. .. 32 Inside the VAX 11/750 and the Quantel 7001 (Paintbox) BBC MICRO FORUM by D. Whitfie!d MA MSc CEng MIEE .. .. .. .. .. .. 44 We pop a numerical keypad into the cauldron BBC MICRO PRINTER SOFTWARE by Michael Tooley BA & David Whitfield MA MSc CEng MIEE .. 46 We look at two dedicated printer ROMs NEWS & COMMENT EDITORIAL .. 7 NEXT MONTH .. .. 37 LEADING EDGE .. . 58 NEWS & MARKET PLACE 8 BAZAAR .. . .. 49 P.C.B. SERVICE .. .. 59 INDUSTRY NOTEBOOK 50 This month's cover shows details of a probe card in use at Motorola's East Kilbride facility. OUR JUNE ISSUE WILL BE ON SALE FRIDAY, MAY 3rd, 1985 (see page 3l) VOLUME 21 No6 JUNE 1985 CONSTRUCTIONAL PROJECTS 'RUR' HOBBY ROBOT by Ralph P Maqee 10 Part One: The metalwork and mechanics ANALOGUE/DIGITAL WAVEFORM GENERATOR by Tom Gaskell BA (Hons) CEng MIEE 22 Simultaneous analogue and digital output signals CBM64 MUSIC KEYBOARD by R. A. Penfold - 26 Add a keyboard to your Commodore and really play it! DIGITAL DELAY & SOUND SAMPLER WITH COMPUTER INTERFACE by John M. H. Becker 40 Part One: Delay techinques and circuit operation LOW COST BBC SPEECH SYNTHESISER UPDATE 49 Software end hardware modifications GENERAL FEATURES MODEMS by M. TooIey BA & D. Whitfield MA MSc CEng MIEE 14 Part One: The basic principles of micro communication SEMICONDUCTOR CIRCUITS by Tom Gaskell BA(Hons) CEng MIFE 19 Data Convertor (ZN435) SPACEWATCH by Dr. Patrick Moore OBE - 32 BBC MICRO FORUM by D. Whitfield MA MSc CEng MIEE 34 Numeric keypad, and Real time Clock hardware SPEECH 64 REVIEW by R. A Peofold 37 The Currah unit investigated INGENUITY UNLIMITED 39 Readers' circuit ideas NEWS & COMMENT EDITORIAL 7 NEWS & MARKET PLACE 8 INDUSTRY NOTEBOOK 24 BAZAAR 33 STRICTLY INSTRUMENTAL 50 P.C.B. SERVICE 52 OUR JULY ISSUE WILL BE ON SALE FRIDAY, JUNE 7th, 1985 (see page3l) VOLUME 21 No.7 JULY 1985 CONSTRUCTIONAL PROJECTS MTX 8-CHANNEL A toD CONVERTER by R.A. Penfold 11 Analogue measurements using the Memotech MTX HI Fl STEREO VCA SYSTEM by Tom Gaskell BA(Hons) CEng MIEE 16 General purpose circuit for the most demanding applications INCREASING LAMP LIFE by E. W. Hunter 20 Extend the life of projector or photoflood lamps and save money VOLTMETER MEMORY ADAPTOR by Jan Erik Borqe 28 Multimeter add-on for tricky measurements DIGITAL DELAY & SOUND SAMPLER WITH COMPUTER INTERFACE by John M. H . Becker .. 44 Part Two Delay selection, master clock oscillator and address counter GENERAL FEATURES SEMICONDUCTOR CIRCUITS by Tom Gaskell BA (Hons) CEng MIEE . . . 14 Voltage ControIled Amplifier (dbx 2150A) .. 21 BBC MICRO FORUM by D. Whitfield MA MSc CEng MIEE . . 24 Real-time clock software and Book Corner ROBOTICS REVIEW by N. Clark .. 27 New regular look at robots and cybernetics SPACEWATCH by Dr Patrick Moore OBE . . . . . . . . 30 MODEMS by M. Tooley BA & D. Whitfield MA MSc CEng MIEE . . . . . 32 Part two: Design techniques and circuit elements. BT ''Approved Design'' spec. WHY FIBRE OPTICS? by Eric Hoffman . . 40 How it works and a report on the EDU-LINK kit INGENUITY UNLIMITED . . . 50 Readers circuit ideas - intelligent level crossing warning lights controller - 7-segment logic probe NEWS & COMMENT EDITORIAL .. 7 INDUSTRY NOTEBOOK .. 19 BOOK REVIEWS .. 38 NEWS & MARKET PLACE .. 8 NEXT MONTH .. 23 LEADING EDGE .. 49 BAZAAR .. 31,43 P.C.B. SERVICE .. 52 'RUR' HOBBY ROBOT--2 We regret that due to circumstances beyond our control Part Two of RUR will not he published until next month This month's cover shows a cluster of probes monitoring a thin-film circuit while nichrome resistors are trimmed to a tolerance of closer than five hundredths of a per cent - courtesy of Mullard. OUR AUGUST ISSUE WILL BE ON SALE FRIDAY, JULY 5th, 1985 (see page 23) (VOLUME 21 No.8 AUGUST 1985 is missing) (VOLUME 21 No.9 SEPTEMBER 1985 is missing) VOLUME 21 No.10 OCTOBER 1985 CONSTRUCTIONAL PROJECTS BYTEBOX by Ray Stuart 10 Part One: System concept and design-- facilitates 16 "sideway" ROMs for the Beeb TOUCH CONTROL PSU by R A Penfold28 Novel power supply with a very practical application MODULATED SYNDRUM by R. A. Penfold 32 Be a big hit with this music project EXPERIMENTING WITH ROBOTS by Mike Abbott 46 Puart two: Constructing the five channel interface GENERAL FEATURES INTRODUCTION TO MICROPROCESSOR SYSTEMS 20 Part One: Basic terms and concepts ROBOTICS REVIEW by Nigel Clark 26 A regular look at robotics and cybernetics SPACE WATCH by Dr Patrick Moore 38 INGENUITY UNLIMITED 40 Readers' circuit ideas - telephone bell ringer lVAX REVIEW by Phil Dane 42 Details of an advanced SCARA design which has four axes of movement BBC MICRO FORUM by D. Whitfield MA MSc CEng MIEE 50 Secrets of the analogue port NEWS S COMMENT EDITORIAL 7 INDUSTRY NOTEBOOK 16 NEXT MONTH 27 NEWS & MARKET PLACE 8 READOUT 18 BOOK REVIEWS 36 BAZAAR 19 P.C.B. SERVICE 52 This months front cover picture shows the National Semiconducior 32 bit microprocessor smashing a "memory barrier" formed by a floppy disc. Courtesy of National Semiconductor. OUR NOVEMBER ISSUE WILL BE ON SALE FRIDAY, OCTOBER 4th, 1985 (see page 27) VOLUME 21 No.11 NOVEMBER 1985 CONSTRUCTIONAL PROJECTS MODEL RAILWAY TRACK CONTROL by J. Milne 10 Power Crazy? Control up to 144 points via a single pair of wires BYTEBOX by Ray Stuart 26 Part Two: System construction and installation-optional extras EXPERIMENTING WITH ROBOTS by Mike Abbott 42 Part Three: Squint DISCO LIGHTS CONTROLLER by John M. H. Becker 45 Versatile effects unit with optional facilities, including computer control and chaser sequencer COMMODORE USER PORT EXPANDER by R. A. Penfold 50 Enables many add-ons to be inter-faced with CBM64 or VIC-20 GENERAL FEATURES ROBOTICS REVIEW by Nigel Clark 18 A regular look at robotics and cybernetics INTRODUCTION TO MICROPROCESSOR SYSTEMS 20 by Michael Tooley BA and David Whitfield MA MSc CEng MIEE Part Two: Practical aspects of a micro system 21 YEARS OF ELECTRONICS by Fred Bennett 32 Part One: Our 21st Birthday issue traces our progress-the first fourteen years SPACE WATCH by Dr Patrick Moore OBE 40 BBC MICRO FORUM by D. Whitfield MA MSc CEng MIEE 55 The Analogue Port Light Pen input is expiscated NEWS & COMMENT EDITORIAL 7 NEWS & MARKET PLACE 8 LEADING EDGE 16 BAZAAR 41 NEXT MONTH 57 P.C.B. SERVICE 58 READOUT 52 SUBSCRIPTION SERVICE 58 VOLUME 21 No.12 DECEMBER 1985 CONSTRUCTIONAL PROJECTS EXPERIMENTING WITH ROBOTS by Mark Stuart 10 High performance stepping motor driver DISCO LIGHTS CONTROLLER by John M H. Becker 24 Part Two: The Chaser' circuit, and interwiring details MODEL RAILWAY TRACK CONTROL by J. Mime 32 Part Two: Final construction and testing MICRO-SCOPE by John M. H. Becker 42 Part One: Make an oscilloscope out of a micro GENERAL FEATURES INTRODUCTION TO MICROPROCESSOR SYSTEMS by Michael Tooley BA and David Whittield MA MSc CEng MIEE 16 Part Three: Getting started-initialisation and configuring peripherals ROBOTICS REVIEW by Nigel Clark 20 A regular look at robotics and cybernetics SPACEWATCH by Dr. Patrick Moore OBE 22 HALLEY'S COMET by Dr. Patrick Moore OBE 28 If you miss this you'll have to wait till 2061 BBC MICRO FORUM by D. Whitfield MA MSc CEng 36 Improved light pen and software 21 YEARS OF ELECTRONICS by Mike Kenward 38 Part Two: The past seven years plus forthcoming trends NEWS & COMMENT EDITORIAL 7 INDUSTRY NOTEBOOK 15 P.C.B. SERVICE 48 NEWS & MARKETPLACE 8 BAZAAR 23 SUBSCRIPTION SERVICE 48 LEADING EDGE 46 INDEX FOR VOL. 21 51 |