PRACTICAL ELECTRONICS APRIL 1987

CONSTRUCTIONAL PROJECTS

PE VIGILANTE CAR ALARM by Mike Delaney 20

Keep your car alert to intruders-build a box to fox them!

SWITCH MODE POWER SUPPLIES by Robert Penfold 34

Three practical circuits illustrating the principles discussed in the SMPSU Design feature.

EXPERIMENTAL ELECTRONICS by the Prof 12

Inductive Loops. Ring the changes for your mobiles remote control them via a cable loop.

THE PE 30 PLUS 30 PART THREE by Graham Nalty 48

Concluding this high quality stereo amplifier design.

SPECIAL FEATURES DESIGN - SMPSUS by Robert Penfold 26

Familiarity with subject names does not mean that they are understood. This article clarifies one such area Switch Mode Power Supplies.

TECHNOLOGY - SENSORS by the Prof 40

For data to be acted upon, it must first be detected. Sensors are a vital link in many control and measurement applications.

DC MOTORS by Brian Brooks 52

During their history, directcurrent motors have been built and applied in countless different ways. Part two of this feature looks at more of them.

REGULAR FEATURES

MICROFORUM by Stephen Burkitt 44

The Amstrad is ideally suited to Eprom programming control. Here is a choice of two hardware interfaces.

NEWS AND MARKET PLACE 4

News, views and new products from the world of electronics, plus countdown, catalogue casebook, firm contact and chipcount.

PCB SERVICE - professional PCBs for PE Projects 60

TRACK CENTRE - the PCB track layout pages 32

BAZAAR - readers' Have and Have-not marketplace 62

BINARY CHOP - a powerful mental logic tester 33

SPACE WATCH AND THE SKY THIS MONTH by Dr. Patrick Moore OBE 46

THE LEADING EDGE by Barry Fox 8

INDUSTRY NOTEBOOK by Tom Ivall 57

PE VOL 23 No. 10 PRACTlCAL ELECTRONICS OCTOBER 1987

CONSTRUCTIONAL PROJECTS

GUITAR TO SYNTH INTERFACE by Rober Penfold 12

Don't let your guitar fret - it too can play an orchestra. Plug in, pluck on, and Hallé-lujah!

TEACHER LOCKER by Tim Pike 35

Continuing the series of articles for G.C.S.E. students by decoding the logic behind a digitally gated lock.

DUAL POWER SUPPLY by David Silvester 42

Outputs at ±15V, up to 1.5A, foldback current limiting and cross linked stabilisation. Power for the coarse or fine workshop.

EPROM PROGRAMMER by Malcolm Harvey 48

Computer controlled 4K data transfer and checking via a single 8-bit port, aided by a multioption menu and location selector.

SPECIAL FEATURES

EDUCATIONALLY PRODUCTIVE a selection of reports 7

Products, events and news of special interest to those on both sides of the classroom.

PROGRAMMABLE LOGIC DEVICES by Chris Kelly 21

PLDs turn design dreams into speedy hardware reality. Using conceptual logic, a computer and a device akin to an eprom, the technology offers other benefits as well.

CLICK ELIMINATORS by the Prof 27

Using circuits more broadly known as pulse blankers, unwanted noise can be filtered from radio receivers, scratched records, and other spiked sources.

REGULAR FEATURES

EDITORIAL - An Exclusive Technology? 9

LEADING EDGE by Barry Fox - Brief Mapping Problems 8

SPACEWATCH by Dr. Patrick Moore OBE - Extra-Solar Planets 46

INDUSTRY NOTEBOOK by Tom Ivall - Electronics in Democracy. 57

MARKETPLACE - what's new, where and when 4

TRACE CENTRE - the PCB track layout pages 32

PCB SERVICE - professional PCBs for PE Projects 60

PROJECT ASSEMBLY - a guide to easy building 61

CHIPCHOP a technical logic research analyser 33

READERS' LEITERS and a few answers 54

BAZAAR - Readers' FREE advertising service 53

POINTS ARISING 58

ADVERTISERS' INDEX 62

NEXT MONTH...

SAFETY POWER UNITS - MORE G.C.S.E. PROJECT IDEAS S SECURITY ALARM CONTROLLERS • MIDI EXPANDER S SEMICONDUCTOR TECHNOLOGY • LASERS AND OPTICAL FIBRES

• PROGRAMMABLE LOGIC DEVICES PARTTWO • DC MOTORS PART THREE • ROBOTICS AND EDUCATION. AND OF COURSE our top line regular features, exciting experimental ideas, and all the latest product information from our advertisers.

PE NOVEMBER 1987 ISSUE ON SALE FROM FRIDAYOCTOBER 2nd - DON'T MISS YOUR COPY PLACE A REGULAR ORDER IT'S STILL ONLY £1.25

November 1987 PE vol. 23 no. 11

CONSTRUCTIONAL PROJECTS

INTRUDER ALARM CONTROLLERS PART ONE by Bill Kent 12

Alarming procedures need taking to deter thieves and vandals. Bill Kent discusses some practicalities.

MIDI EXPANDER by Robert Penfold 24

Musical profusion through patched up tuning - or how to become a solo band without really trying.

TEACHER POWER by Tim Pike 35

Another feature for G.C.S.E. students in which power supplies are examined and a working example described.

COMPUTER D.C. MOTOR CONTROLLER by Mark Stuart 43

Programmed model mobilisation is readily achieved with this micro to motor interface.

SPECIAL FEATURES

SEMICONDUCTORS PART ONE by Andrew Armstrong 17

The first of a series of articles demystifying the business of choosing and using semiconductors.

OPTIC FIBRES, LASERS AND COMMUNICATIONS by Barry Fox 27

The digitised harnessing of light increases the speed and reliability of communications, despite an odd joker in the fibre pack.

PROGRAMMABLE LOGIC DEVICES PARTTWO by Chris Kelly 49

PLDs turn design dreams into speedy hardware reality, especially when PALs, FPGAs are programmed.

CLASSROOM ROBOTICS by Lawrence Hamburg 54

Practical control of robots teaches analysis techniques and instils an understanding of the disciplines neededfor the adult world.

REGULAR FEATURES

EDITORIAL-Security 9

LEADING EDGE by Barry Fox -The quality of Dallas 8

SPACEWATCH by Dr. Patrick Moore OBE -A true double quasar?. 46

INDUSTRY NOTEBOOK by Tom Ivall - Five billion customers 57

MARKETPLACE -what's new, where and when 4

PCB SERVICE - professional PCBs for PE Projects 60

TRACK CENTRE - the PCB track layout pages 32

CHIPCHOP-a technical logic research analyser 41

BAZAAR - Readers' FREE advertising service 56

ADVERTISERS' INDEX 62

NEXT MONTH...

RADIO RECEIVER - ANOTHER GCSE PROJECT IDEA • MULTIZONE BURGLAR ALARM • RS232C TO MIDI CONVERTER • SEMICONDUCTOR TECHNOLOGY • CODED LOCK TECHNIQUES . APPLIANCE TIMER • TELEPHONES ANCIENT AND MODERN S SOLAR CELLS. AND in addition to our top line regular features, exciting experimental ideas, plus all the latest product information from our advertisers.

THERE IS ALSO A HIGHLY INFORMATIVE, COLOURFUL DATA CARD

DON'T MISS YOUR COPY OF THE PE DECEMBER 1987 ISSUE

ON SALE FROM FRIDAY NOVEMBER 6TH

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