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| VOL.26 NO 1 JANUARY 1990 NEW TUTORIAL SERIES BASIC ELECTRONICS - PART ONE by Owen Bishop ...19 How and why does electronics work? In this new series we shall take you through the theory and practice that could put you on track towards an exciting great career. First we examine electricity and resistance. This interesting and informative multipart series is far too important to miss. Collect the full set, starting NOW! CONSTRUCTIONAL PROJECTS EEPROM PROGRAMMERS by Malcolm Harvey 12 Open up the port to microprocessor projects with one of our low cost eeprom programmers. Ideal for dabblers and habitual experimenters alike! BARGRAPH TACHOMETER by Chris Walker 25 Show your car you care for its welfare and your wallet could take note of your timely investment in this simple but effective rev counter. PE CHRISTMAS CROSSWORD by Anthony H. Smith 34 If your festive gadabouts put you flat out, give your brain a workout and puzzle out if you're as techNOELodgeable as you make out! BIKE ALARM by Chris Brown 35 Chris's bike's all right Jack, with a jack to thwart the hijack! Push-off empty-handed is the alarming message to would-be push-bike thieves. SPECIAL FEATURES HF RADIO - PART SIX by Mike Sanders 39 Summarising essential transmission characteristics, including cw, am, fm and ssb, conversion techniques, age and vswr protection. RESISTORS IN PARALLEL by Joe Chamberlain 44 A handy ready-reckoner workshop-wall guide for calculating parallel resistor values. Far more interesting than a Page Spin-up! UCT PERFORMANCE -PART ONE by Anthony H. Smith..48 Demanding applications require increased sophistication in counter-timers. Do you know how its achieved, what to look-out for, and if the extra expense is justified? REGULAR FEATURES EDITORIAL by John Becker - Starting terms 9 LEADING EDGE by Barry Fox - Cellular eavesdropping 8 INDUSTRY NOTEBOOK by Tom vaIl - Co-operation in competition 57 SPACEWATCH by Dr Patrick Moore - Through a crystal brightly 46 READERS' LETTERS - and a few answers 38 PRODUCT FEATURES NEWS AND MARKETPLACE - The latest in multimeters, and what else is new, where and when 4 BOOKMARK SUMMARY - index to PE's 1989 book reviews 30 BAZAAR - Readers' FREE advertising service 53 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 ADVERTISERS' INDEX - locating favourite stockists 62
V0L26 N02 FEBRUARY 199O COMPETITION RESULTS CELEBRATED WINNERS' 60 An Acorn A3000 computer, 10 Girkit digital mi!timeters, years and years of PE subs! CONSTRUCTIONAL PROJECTS PE MODEM by Kevin Kirk 12 PE puts you on the hi-tech comms line, building your own high quality, modest cost machine that's suitable for use with virtually any computer SWITCHED EEPROM PROGRAMMER by Malcolm Harvey 27 How to build a really low cost programmer that puts microprocessing control within reach of all constructors pockets! MOCK STEREO AND EQUALISER by John Becker 32 An Easi-Build example of how one into two will go if you stop at three first! Turn your mono music into simulated stereo, with a touch of potted equality thrown in! MOTOR SPEED CONTROL by Andrew Armstrong 40 An Ask PE answer to putting you ergonomically on course to the 19th with a powerful driver. Suitable for non-golfers too! INGENUITY UNLIMITED by Enthusiastic Readers 42 Three novel ideas: a Hex Keyboard, a Car Burglar Alarm, and an RF Relay. SLAVE FLASH by Chris Brown 45 Chris and his multiple flash-gun genie brighten up the photogenics and earn their Brownie points! SPECIAL FEATURES COMPUTERS - PART ONE by Mike Sanders 21 From Ascii to Zilog, this is the story of the hows and whys, and the rise and rise of computers - and you don't need a degree in logic to follow it! BASIC ELECTRONICS - PART TWO by Owen Bishop ...35 Discovering how electronics works, and why! A closer examination of resistance is this month's theme. CROSSWORD - THE ANSWERS! by Anthony H. Smith..48 Cross-checking our techno-cryptic blankety-blanks! UCT PERFORMANCE - PART TWO by Anthony H. Smith ..49 Contact bounce avoidance, frequency multiplying schemes, selective arming, and other special techniques for improved uct measurements. REGULAR FEATURES EDITORIAL by John Becker - Beware the cat! 9 LEADING EDGE by Barry Fox - CD video 8 INDUSTRY NOTEBOOK by Tom Ivall - Two cultures revisited 57 SPACEWATCH by Dr Patrick Moore - Junk advert space .... 46 READERS' LETTERS - and a few answers 38 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new, where and when 4 PCB SERVICE - professional PCBs for PE Projects 52 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 ADVERTISERS' INDEX - locating favourite stockists 62
VOL 26 NO 5 MARCH 1990 CONSTRUCTIONAL PROJECTS RADIO CLOCK by John Becker 13 Discover how to pluck time and calender data from the airwaves, and acquire a test gear tester as well! And you'll also learn more about how a computer can be used to simulate a logic circuit before the hardware is designed. MOTOR SPEED CONTROL by Andrew Armstrong 39 An Ask PE answer to putting you ergonomically on course to the 19th with a powerful driver. Suitable for non-golfers too! INGENUITY UNLIMITED by Enthusiastic Readers 59 Avoid that flattened feeling with a low battery warning circuit, and how to gang up on the resistance to trim voltage to size. SPECIAL FEATURES BASIC ELECTRONICS - PART THREE by Owen Bishop 20 Discovering how electronics works, and why! This new series takes you through the theory and practice that could put you on track towards an exciting great career. This month we take a concluding look at resistors and move on to capacitors and inductors. Don't miss a single word of this interesting and informative mu!tipart series. Ensure you collect the full set! COMPUTERS - PART TWO by Mike Sanders 41 In which we further uncover the secrets of what goes on behind the vdu and the keyboard, from discs, buffers and buses, to decoding and architecture! HI-TECHING TRAMS 49 In this new age of conservation concern, it's pleasing to find that not everything needs to be scrapped when it gets a bit old, particularly when technology can come to the rescue! COMPETITION ANSWERS 50 Last month we announced the winners of our 25th Anniversary Competition. Here now are the answers to the simple questions posed, and your Ed goes in for a bit of analysis! REGULAR FEATURES EDITORIAL by John Becker - Ruling data 9 LEADING EDGE by Barry Fox - CD video II 8 INDUSTRY NOTEBOOK by Tom vaIl - New European electronics 57 SPACEWATCH by Dr Patrick Moore - Adaptive optics 46 READERS' LETTERS - and a few answers 52 POINTS ARISING - the query clarifying corner 52 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new, where and when ....4 PCB SERVICE - professional PCBs for RE Projects 60 ADVERTISERS' INDEX - locating favourite stockists 62
V0L26 N04 APRIL 1990 COMPETITION WIN A ROBOT BUILDER'S BONANZA! 61 Answer a few simple questions and you could gain constructive command control over literarily close to a ton of robotics projects! CONSTRUCTIONAL PROJECTS ROBOT CAR BUILDING - PART ONE by Alan Pickard 12 Wouldn't you love to build your own robot? Of course you would! And here's the chance circuits, controls and experimental software to fire your imagination, enhance your knowledge, and increase your enjoyment. PC INTERFACING by Robert Penfold 19 The IBM PC and its clones have enormous versatility and can be more than just business machines. Discover for yourself how well suited they are for easy interfacing to external control and monitoring applications. RADIO CLOCK - PART TWO by John Becker 35 Understanding and implementing the logic behind designing software and dedicated hardware for decoding transmitted time codes into meaningful data displays. SPECIAL FEATURES ARTIFICIAL INTELLIGENCE by Richard Mishra 26 Do you understand the basic concepts of Al and know the goals aimed at by researchers into a realm that is both technological and philosophical? COMPUTERS - PART THREE by Mike Sanders 29 Concluding our micro-tour round the buses with a look at high level languages, supercomputers, the fifth generation and expert systems. HOME BASE by John Becker 32 First in a new series regularly highlighting new electronic goods and services of interest to all who live or work at home. SPACE TV by Frank Mendacio 42 An updating report on the problems experienced by Britain's third satellite tv organisation. BASIC ELECTRONICS - PART FOUR by Owen Bishop 48 Explaining the nature of semiconductors, those all-essential devices without which modern electronics could not function. Plus a couple of interesting modules that'll keep your soldering iron from boredom. REGULAR FEATURES EDITORIAL by John Becker - Hobby horse 9 LEADING EDGE by Barry Fox - Squaring up to Japan 8 INDUSTRY NOTEBOOK by Tom IvaIl - Challenge and choice 57 SPACEWATCH by Dr Patrick Moore - Hubble Space Telescope 46 READERS' LETTERS - and a few answers 43 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new in electronics 4 BOOKMARK - the Editor's browse through some new books 45 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 ADVERTISERS' INDEX - locating favourite stockists 62
VOL 26 N05 MAY 1990 CONSTRUCTIONAL PROJECTS EPROM POLY-PROGRAMMER by Kevin Browne 12 A sophisticated programmer for constructors who can't keep their digits off microprocessor and eprom control projects. It has the ability to program many different eprom types and is suitable for use with any computer having an RS232 port. ROBOT CAR BUILDING - PART TWO by Alan Pickard ...31 Drive an easy bargain for yourself! Build our Microbe 3 robot car controller and you'll be putting yourself and your computer on the road to automated mobilisation. RADIO CLOCK - PART THREE by John Becker 36 Adding the final software bits to the logic register controller, plus a timely look to the past, present and future. SPECIAL FEATURES INTELLIGENT LCD MODULES by John Becker 19 An in-depth examination of one of the latest Sanyo multi-character alphanumeric lcd displays to become more widely available to the amateur market. Understanding the principles will give you greater power over your circuit display capabilities. HOME BASE by Ian Burley 26 Another in the series regularly highlighting new electronic goods and services of interest to all who live or work at home. This month we report on some of the new products which made an appearance at the Winter Consumer Electronics Show in Las Vegas. BLANKET COVERAGE by Wayne Green 40 Is our American correspondent emulating Cassandra, and will we heed the warning that electric blankets may radiate more than just bed-time warmth? BASIC ELECTRONICS - PART FIVE by Owen Bishop 43 Examining the fundamentals of photo diodes, leds and zeners. And there are three simple circuits to build: a temperature sensor, a relay and a fire alarm. REGULAR FEATURES EDITORIAL by John Becker - Bliss or blight' 9 LEADING EDGE by Barry Fox - Consuming Japanese 8 SPACEWATCH by Dr Patrick Moore - Austin's comet 38 INDUSTRY NOTEBOOK by Tom Ivall - Electrons and photons 49 POINTS ARISING the query clarifying corner 6 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - saving pounds on PE 11 ARMCHAIR BOOKSHOP - haven for practical bookworms 50 PCB SERVICE - professional PCBs for PE Projects 52 ADVERTISERS' INDEX - locating favourite stockists 54
V0L26 N06 JUNE 1990 CONSTRUCTIONAL PROJECTS SMARTER LCD MESSAGE MAKING by John Becker 12 Using the Sanyo LCM57O intelligent liquid crystal display examined last month, this practical circuit gives you computerised and eeprom-controlled message making, complete with experimental Basic software listing example. BAUD RATE CONVERTER by Robert MacFarlane 25 Frustrated over your IBM PC not having a split baud rate at the serial port? This converter could provide a simple solution to real-time communication with Prestel and Viewdata bulletin boards. INTERMITTENT WIPER by Andrew Armstrong 29 Ever open to clarifying queries, our Ask PE correspondent tells you how he friendly helped clear up a motorists backward vision problem. CIRCUIT BREAKER by Steve Bailey 35 Just the job for keen experimenters who ignore the rule books in favour of haste - a power Fine protection circuit without fuses. EPROM POLY-PROGRAMMER - PART 2 by Kevin Browne .39 How to test-drive our sophisticated programmer and give yourself the power to program many different eprom types using any computer having an R5232 part. ROBOT CAR BUILDING - PART 3 by Alan Pickard 49 Implementing the menu-driven running program puts the auto-digits behind the wheel of our experimental robo-buggy Microbe 3. SPECIAL FEATURES BASIC ELECTRONICS - PART SIX by Owen Bishop 19 Understanding how transistors are made and why they work, with some practical experiments showing you how to investigate and use them. HOME BASE by Ian Burley 32 This month in our regular feature we update you on the new telepoint digital cordless phone service, and see how close we are to teleshopping via Keyline. REGULAR FEATURES EDITORIAL by John Becker Dumping consumers 9 LEADING EDGE by Barry Fox - Radio linking 8 TRACK FEEDBACK - readers' letters, and a few answers 44 SPACEWATCH by Dr Patrick Moore - Venus revisited 46 PRODUCT FEATURES INDUSTRY NOTEBOOK by Tom Ivall - Cardboard and cuckoo city 57 NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - saving pounds on PE 11 BOOKMARK - the Editor's browse through some new books 52 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 PCB ASSEMBLY GUIDE - the route to better board building 61 ADVERTISERS' INDEX - locating favourite stockists 62
V0L26 N07 JULY 1991 CONSTRUCTIONAL PROJECTS MORSE DECODER by John Becker 12 For amateur radio students and the generally inquisitive, our semuntelligent lcd module helps un-dash the Ts and un-dot-dot the is. REMOTE POWERED MICROPHONES by Vivian Capel 27 The popular Electret microphone gives years of excellent service, until the internal battery gives-out, sometimes with disastrous results. Our phantom could help you beat the jinx. AC MOTOR CONTROL by Andrew Armstrong 43 As an answer to an Ask PE query, we describe one way in which a variable speed control unit can be used with ac series wound motors in the 1-2kW range. SPECIAL FEATURES DIY PCS by Robert Penfold 20 Authoritative advice on assembling your own IBM PC compatible computer from an expert who has built his own, and written this feature using it. HISTORY OF TECHNOLOGY - HERTZ by Ian Poole 31 A foremost researcher of his time, Hertz proved the existence of electromagnetic waves, laying the firm foundations upon which radio technology was built. HOME BASE by Ian Burley 32 Philips launches CD-I, British Aerospace announces Microtel, BYPS rabbits-on about cordless phones, and will Iron provide the key to city intelligence? MOBILE RADIO by Mike Sanders 35 The popular concept of mobile radio is that it's a vehicle-mounted system with a fixed base station, but hand-held and back-pack systems also qualify. We examine the history and the technology. BASIC ELECTRONICS - PART SEVEN by Owen Bishop ..49 More on transistors, and a modular demonstration of how to score a good try on the touchline and never be off-side for frost or fire. WINNING BONANZAS by the Editor and a few readers ....52 The winners of our robotic's books competition have been drawn. Some ought to have been hung and quartered as well for their limerical worse-verse! REGULAR FEATURES EDITORIAL by John Becker Heritage 9 LEADING EDGE by Barry Fox Insecure cells 8 SPACEWATCH by Dr Patrick Moore Brown dwarfs 46 TRACK FEEDBACK Readers' letters, and a few answers 51 INDUSTRY NOTEBOOK by Tom vail. The megacellphone 57 PRODUCT FEATURES NEWS AND MARKETPLACE what's new in electronics 4 SPECIAL SUBS OFFER - saving pounds on PE 10 BOOKMARK- the Editor's browse through some new books 41 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 HOW TO DO IT - the route to better board building 61 ADVERTISERS' INDEX - locating favourite stockists 62
V0L26 N08 AUGUST 199 CONSTRUCTIONAL PROJECTS SCOPE EXPANDER by John Becker 12 How to give your oscilloscope at least eight traces for digital displays, plus a signalsampling 64K memory. You'll find you've given yourself a multi-byte visual logic analyser as well. AF OCTAVE MEASURER by Joe Chamberlain 23 No-one involved in audio circuit design and testing should overlook this multi-octave frequency-analysing display unit. It also offers you practical experience with switchedcapacitor filters. VOLTAGE PROBE by Stephen Bailey 51 Here's a simple but very effective circuit monitor which uses bargraph leds to show you what's happening at the low frequency points in your analogue or digital circuits. SPECIAL FEATURES CELLULAR RADIO by Mike Sanders 19 Cellular radio is another form of mobile radio and it was introduced essentially for use by the general public. We look at the principles upon which it works. BASIC ELECTRONICS - PART EIGHT by Owen Bishop ..37 In which we take a positive and negative approach to feedback, and examine how a small signal can be made into a bigger one. In other words, we investigate amplifiers, including their biasing, stabilisation and impedance. HISTORY OF TECHNOLOGY - MAXWELL by Ian Poole ..45 Probably best remembered for his research into electromagnetic theory, James Clerk Maxwell also researched into colour photography, gases and astronomy. His was a short life, but an important one for technology. HOME-BASE by Ian Burley 48 Whether of not Sony has knocked another nail into the book coffin, DVI's life certainly seems assured, as fax might tell you vocally. REGULAR FEATURES EDITORIAL by John Becker - Testing addicts 9 LEADING EDGE by Barry Fox - Jet line griping 8 SPACEWATCH by Dr Patrick Moore - Space comes closer to home 46 INDUSTRY NOTEBOOK by Tom lvall - Satellited and letter-boxed 57 TRACK FEEDBACK - Readers' letters, and a few answers 30 POINTS ARISING - the query clarifying corner 30 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - FREE gifts for PE subscribers 10 BOOKMARK - the Editor's browse through some new books 35 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 ADVERTISERS' INDEX - locating favourite stockists 62
VOL 26 NO 9 SEPTEMBER 1990 CONSTRUCTIONAL PROJECTS PE TELE-SCOPE by John Becker 12 Turn your tv into an oscilloscope without tinkering with its innards by building this unique interface module. Its a lower cost way to give your circuits the screen test. AF OCTAVE MEASURER - PART 2 by Joe Chamberlain ....23 Detailing the amplifiers and switched filter circuits of the multi-octave audio frequency analyser that's been developed especially for devoted audio designers and repairs. SCOPE EXPANDER - PART TWO by John Becker 35 Testing and putting the finishing touches to the memorable 64K signal sampler that gives your oscilloscope at least eight digital traces. DESK THERMOMETER by Owen Bishop 39 You're sure to give a warm welcome to our easy-to-calibrate modular temperature monitor. FLASHER ALARM by Paul Benton 45 We'll leave the puns to you, this circuit's even more practical and is especially useful to drivers whose indicators excessively go on the blink. SPECIAL FEATURES RADIO PAGING by Mike Sanders 19 In an overcrowded radio spectrum pagers are economic users of the airwaves and quick bleeps or brief led messages are being well received. HISTORY OF TECHNOLOGY - EDISON by Ian Poole 31 Arguably the most prolific inventor ever, Edison set up an invention factory, masscreating revolutionary innovations. He also discovered the semiconductor effect. HOME-BASE by Ian Burley 32 State-side some possible futures have been displayed at the Summer Consumer Electronics Show in Chicago. We review what could be coming our way. BASIC ELECTRONICS - PART NINE by Owen Bishop 48 We discuss an assorted selection of devices and circuits this month. particularly phototransistors. thyristors and jfets. There are some more modules to build as well. HOME DATA SYSTEMS by Wayne Green 52 Our renowned American correspondent enthusiastically considers the potentialities for cdrom data bases. REGULAR FEATURES EDITORIAL by John Becker - Tools for the job 9 LEADING EDGE by Barry Fox - Mapping perspective 8 SPACEWATCH by Dr Patrick Moore - HST teething troubles 46 INDUSTRY NOTEBOOK by Tom Ivall 57 NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - FREE binders for PE subscribers 10 BOOKMARK - the Editor's browse through some new books 52 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 HOW TO DO IT - the route to better board building 61 ADVERTISERS' INDEX - locating favourite stockists 62
VOL 26 NO 10 OCTOBER 1990 READER LOYALTY BONUS GET YOUR GOODS FREE from our advertisers 35 CONSTRUCTIONAL PROJECTS CHIPTESTER by Dave Raynor 12 Be sure your chips are in good health by letting this professional quality chip tester analyse theft capabilities with the assistance of a Beeb computer. PE TELE-SCOPE - PART 2 by John Becker 19 Discussing timing circuit details, turning theory into practice, and carrying out the simple alignment to the interface which turns your tv into a 2MHz oscilloscope. AF OCTAVE MEASURER - PART 3 by Joe Chamberlain ...37 Putting the finishing touches to our sophisticated multi-octave frequency analyser. It's an excellent item of audio-workshop test equipment. SOUND OPERATED SWITCH by Paul Benton 41 Let the voice of a caller at your door light up his features for night-time recognition as friend or foe. An ideal project for the security conscious. SPECIAL FEATURES POLYLINE METERING by Robert Redding 19 Does it really make sense for inspectors to personally visit households n order to read the gas and electricity meters? HISTORY OF TECHNOLOGY - OHM by Ian Poole 30 Ohms Law defines the inter-relationships of resistance, current and voltage, but did you know that Ohm's work was largely ignored by the scientific community? HOME-BASE by Ian Burley 32 Continuing our perusal of the new products on display at the Summer Consumer Electronics Show in Chicago, and which are likely soon to be on sale in Britain. BASIC ELECTRONICS - PART TEN by Owen Bishop 48 Increase your understanding of electronics by knowing more about devices which control current and voltage. And gain more experience by building the modules. REGULAR FEATURES EDITORIAL by John Becker - Viewing philosophy 9 LEADING EDGE by Barry Fox - Radio data systems 8 SPACEWATCH by Dr Patrick Moore - Another solar mystery 46 INDUSTRY NOTEBOOK by Tom Ivall - A boost from the ERM 57 POINTS ARISING 40 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - FREE binders for PE Subscribers 10 BOOKMARK - the Editor's browse through some new books 52 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 HOW TO DO IT - the route to better board building 61 ADVERTISERS' INDEX - locating favourite stockists 62
VOL 26 NO 11 NOVEMBER 1990 READER LOYALTY BONUS! GET YOUR GOODS FREE from our advertisers 39 CONSTRUCTIONAL PROJECTS BIKE COMPUTER by John Becker 12 Make your cycling measure up to micro technology with our multi-mode miles and metric motion monitor. Or you can gear it down for use as a general-purpose 6502 microcontroller board complete with rom, ram and i/o interface. IN-SITU NICAD CHARGER by Dave May 41 Why bother to switch off your personal stereo to change the batteries? Build this adaptor and keep your listening chargeably uninterrupted! CHIPTESTER - PART TWO by Dave Raynor 48 It's no major operation to put this professional qualfty monitor into private health care practice for the welfare state of your chips. SPECIAL FEATURES LASERS - PART ONE by Mike Sanders 19 Once merely science fiction concepts, lasers have become common-place realities. We examine their properties, functions and varieties. BASIC ELECTRONICS - PART ELEVEN by Owen Bishop.25 Opamps are the theme this month, and a good understanding of what they are and how they can be used is vital for anyone with analogue intentions. HISTORY OF TECHNOLOGY - FARADAY by Ian Poole 31 The discoverer of electromagnetic induction, and the man after whom the unit of capacitance was named, Faraday was one of the greatest scientists of all time. HOME-BASE by Ian Burley 32 Heralded four years ago, the first Keyline terminals are helping people to shop without venturing outside. Our correspondent's going on-line. Will you? WHY DIGITAL PHONES? by Tom Ivall 35 Great benefits are to be gained from the incoming digital public mobile phone systems, some unseen, some more tangible. We examine the principles. REGULAR FEATURES EDITORIAL by John Becker - On your micro-bike 9 LEADING EDGE by Barry Fox - Electronic Yellow Pages 8 SPACEWATCH by Dr Patrick Moore - Over the Sun 46 INDUSTRY NOTEBOOK by Tom Ivall - St Cecilia Electronica 57 TRACK FEEDBACK - Readers' letters, and a few answers 47 PRODUCT FEATURES NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - FREE binders for PE subscribers 10 BOOKMARK - the Editor's browse through some new books 45 ARMCHAIR BOOKSHOP - haven for practical bookworms 58 PCB SERVICE - professional PCBs for PE Projects 60 HOW TO DO IT - the route to better board building 61 ADVERTISERS' INDEX - locating favourite stockists 62
VOL 26 NO 12 DECEMBER 1990 £2000 TO GIVE AWAY! Enter our monthly draw and you too could let us pay for your purchases 61 CONSTRUCTIONAL PROJECTS MICROCONTROLLING THE ROBOT CAR by Alan Pickard 12 Don't keep your mini-mobiles on a short-leashed computer link, give them independent freedom by installing a 6502 microcontroller. BIKE COMPUTER - PART TWO by John Becker 23 Tailoring the software to personalise our micro-cyclo to suit your cycle and checking out the multi-mode screen monitor. 8748 PROGRAMMING ADAPTOR by Kevin Browne 29 By overwhelming demand: an add-on unit allowing 8748-type microcontroller chips to be programmed on the popular Eprom Poly-Programmer. SPECIAL FEATURES EASY-PC PCB CAD by John Becker 17 The British Design Award-winning computer aided pcb software system is given a thorough going-over and gains another praising convert. A CASE FOR TECHNOLOGY by Desmond Harvey 26 An authoritative guide to boxing for all reasons: the criteria to consider, the options available, and the state of enclosure technology. HOME-BASE by Ian Burley 36 Kodak's new Photo-CD system is set to revolutionise still-photography, putting prints on tv as readily as in your hand. LASERS - PART TWO by Mike Sanders 41 Examining how semiconductor lasers work, turning electrical energy into coherent light with properties governed by grooves. BASIC ELECTRONICS - PART TWELVE by Owen Bishop 49 More on opamps and how they can be used for addition, subtraction, differentiation and integration. Plus another module to build. HISTORY OF TECHNOLOGY - MORSE by Ian Poole 53 Currently renowned for his invention of the morse code, Morse may eventually be best remembered as the foremost American artist. REGULAR FEATURES EDITORIAL by John Becker - Converted to CAD 9 LEADING EDGE by Barry Fox - Standardising CT2 8 SPACEWATCH by Dr Patrick Moore - Mars under-foot 47 INDUSTRY NOTEBOOK by Tom Ivall - High tech hewers 57 TRACK FEEDBACK - Readers' letters, and a few answers 35 ANNUAL INDEX 1990- Your master guide to PE for the year 32 NEWS AND MARKETPLACE - what's new in electronics 4 SPECIAL SUBS OFFER - FREE binders for PE subscribers 10 HOW TO DO IT - the route to better board building 48 PCB SERVICE - professional PCBs for PE Projects 52 ARMCHAIR BOOKSHOP - haven for practical bookworms 56 ADVERTISERS' INDEX - locating favourite stockists 62 | ||
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