VOLUME 22 No. 4 APRIL 1986

CONSTRUCTIONAL PROJECTS

SOUND SWITCH by R. A. Penfold 10

A useful audio add-on incorporating a CCD delay line

STEbus POWER SUPPLY by Fariba Sanieenejad 20

An IEEE1000 compatible PSU with additional features such as variable output for EPROM programming

TEMPERATURE/ANALOGUE INTERFACE 28

by R. A. Penfold

Amstrad or Spectrum analogue port designed for accurate temperature measuring applications

PHOTOGRAPHIC TRIGGER UNIT by R. E. Head 32

Flexible aid for photographers-sound or light triggered for automatic flash or motor-wind

SCRATCH AND RUMBLE FILTER by D. Stone 50

Stereo noise reduction system

BYTEBOX MODIFICATIONS by J. R. Kelly and Ray Stuart 26

Further ideas for the sideways-ROM project and batterybacked RAM

NEWS AND REVIEWS

NEWS AND MARKET PLACE 4

What's new, what's happening and what's coming in the electronics world

READERS LETTERS 7

What you say and what you think

BOOK REVIEWS 7,23

A selection of the latest releases

NEWS LATEST 57

Last minute news items

REGULAR FEATURES

BBC MICRO FORUM by Ray Stuart 23

The 1 MHz bus-circuits and design ideas

SPACEWATCH by Dr Patrick Moore OBE 38

News from space and the sky this month

INGENUITY UNLIMITED 44,47

A selection of circuits and design ideas

ROBOTICS REVIEW by Nigel Clark 46

The latest from the world of industrial and educational robots

INDUSTRY NOTEBOOK by Nexus 48

What's happening inside industry

THE LEADING EDGE by Barry Fox 15

The technology behind the technology

SPECIAL FEATURES

SETTING THE STANDARDS by Richard Barron 16

The PE standards for an industrial and hobby microinterface bus

BYTEBOX UPDATE 26

The latest ideas for the popular sideways ROM project

EMI MEANS TROUBLE by Simon Battman 60

Interference, a growing menace

SILICONE CONTAMINATION by Gerald Kingsbury 40

Science feature-the silicone factor

PE SERVICES

PCB SERVICE 53

P.c.b. list and prices for PE projects

BAZAAR 54

Free readers' ads

SUBSCRIPTIONS AND BACK NUMBERS 55

Regular order form BOOK SERVICE 56

A selection of the latest electronics titles

OUR MAY 1986 ISSUE WILL BE ON SALE FRIDAY, APRIL 4th, 1986 (see page 37)

VOLUME 22 No. 11 NOVEMBER 1986

NEWS AND REVIEWS

COMPETITION 43

If you think £89.95 is too much to pay for the latest in l.c.d. technology, then have a go at getting one for FREE.

WHAT'S NEW 10

A look at some of the new products from the world of electronics.

WHAT'S HAPPENING 12

Current events in the world of science, technology and electronics.

WHAT'S TO COME 12

What present developments might bring in the future.

COUNTDOWN 12

Forthcoming events in the electronics world.

CATALOGUE CASEBOOK 10

A guide to the latest electronics catalogues available.

POINTS ARISING 10

What's wrong

REGULAR FEATURES

SPACEWATCH AND THE SKY THIS MONTH

by Patrick Moore OBE 21

Our regular astronomy page reports on current events and phenomena in the world of space exploration and astronomy. Plus, what to look for in the sky this month.

THE LEADING EDGE by Barry Fox 14

In-depth news on the technology behind the technology. This month - Richard Branson's successful bid to get the Blue Ribband and how it proved to be a useful exercise for the military.

INDUSTRY NOTEBOOK by Nexus 36

Our regular look at the electronics industry. This month more on the Nimrod fiasco and a government ultimatum to GEC.

PE SERVICES

BAZAAR 50

A useful page for bargain hunters. Free readers advertisement service.

PCB SERVICE 48

We provide p.c.b. patterns for most of our constructional projectsor if you haven't the facilities to make your own, we supply top quality tinned copper clad ready made p.c.b.s, at very reasonable prices.

PE ARMCHAIR BOOK SERVICE 44

We can supply a large range of books direct to your door on a wide variety of electronics and science related subjects. Whatever your particular interest, the PE book service can fulfil your reading needs.

SUBSCRIPTIONS, BACK ISSUES AND BINDERS 49

Take advantage of our special TV OFFER this month and you can save at least £10 on the Citizen pocket lcd. TV. It makes an ideal christmas gift for anyone.

PROJECTS TO BUILD

WIRELESS BABY ALARM by RE. Head 32

The mains wiring in any premises provides a useful and practical medium for speech transmission and a basic design gives rise to numerous applications such as the versatile baby alarm described in this article.

EPROM PROGRAMMER (continued from October) 38

This concludesthe design of one of the most versatile progammers available to the hobbyist. It uses excellent software and hardware techniques which enable it to programme almost any device.

SHOESTRING SATELLITE by Andrew Randle 26

A novice's approach to DIY satellite TV. This is a comprehensive guide to constructing your own dish and receiving unit for around £250. Andrew Randle was a finalist in the Philips European Voung Scientists contest and gained a merit certificate for this design.

REMOTE CONTROLLED JOYSTICK by R.A. Penfold 16

This application of l.R. technology gives you the freedom you need when you're defending your home base from alien invaders or simply plotting a circuit diagram. The remote control joystick is an extremely useful computer add-on and may be used with any switch-type computer joystick or user port.

DESIGN AND TECHNOLOGY EXPERIMENTAL ELECTRONICS by The Prof. 22

When we come up with a reasonable working design for a particular application, we tend to use variations of it whenever it is applicable. This is the safest and easiest way to design circuits. For example, how many class A or B type amplifiers have been described in the hobbyist press over the years? This month we experiment with the less common class D amplifier.

VIDEO PICKUPS by Vivian Capel 40

With the growing interest in TV and video technology in both the consumer and hobbyist sector, this month's technology feature deals with the proliferation of video pick-up devices and in particular the charge-coupled device.

LCD TECHNOLOGY by The Prof. 42

A brief lookat lcd. technology and its use in modern miniature TV designs. Plus the latest from citizen UK and our special offer.

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