| | 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 No.6 JUNE 1985 is missing)
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 is missing)
(VOLUME 21 No.12 DECEMBER 1985 is missing)
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