Solution Microcap 5 Reviewed Nulling Coil Interaction Analogue Filters Alternative Balanced Amplifier Analysing Fm Noise
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EW+WW exclusivea0% off virtual instruments ELECTRONICS Denmark DKr. 65.00 Germany DM 15.00 Greece Dra.950 Holland Dfl. 14 Italy L. 8000 IR £3.30 Singapore 5S12.60 WORLD Spain Pts. 750 USA $4.94 A REED BUSINESS PUBLICATION +WIRELESS WORLD SOR DISTRIBUTION September 1995£2.10 New audio power solution MicroCap 5 reviewed Nulling coil interaction Analogue filters Alternative balanced amplifier Analysing fm noise 20% discountumaudio analyser UK launch MICROMASTER LV PROGRAMMER by marl manufActurers111(10611g AMD MICROCHIP ATMEL from only £495 THE ONLY PROGRAMMERS WITH TRUE 3 VOLT SUPPORT The Only True 3V and 5V FEATURES Widest ever device support Universal Programmers including EPROMs, EEPROMs, Flash, Serial PROMs, BPROMs, ce Technology's universal programming solutions are designed with the future in mind. 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Microcontrollers, without adaptors, including PICs,emulator. Configuration: 128K by 16, 256K by 8, 2 89C5 I, 68HC705/7 II, ST6, Z8 etc. by 128K 8, expandable to 5 12K by I6/1024K by 8. For a copy of our catalogue gibingfull details of G Y 0 ICE Technology Ltd. Penistone Court, Station Buildings, programmers, emulators. erasers. adaptors and logic 0 Penistone, South Yorkshire, UK S30 6HG analysers call. fax or dial the BS numbers belt to Tel: +44 (0)1226 767404 Fax: +44 (0)1226 370434 AMERICAN BBS: +44 (0)1226 761181 (14400,8N1) MinnaWSA EXPRESS 331 CIRCLE NO. WI ON REPLY CARD it CONTENTS 728 DESIGNING WITH A 783 PREDICTING FM SINGLE RAIL NOISE EFFECTS Design expert Walt Jung presents Everyone knows that noise affects analogue solutions for systems where integrity in fm data communications - only a single, low -voltage supply is but by how much? available. 787 ASP AND FILTERING 736 ADD SENSES TO In the Design Brief series, Ian Hickman looks at the benefits of using analogue YOUR PC signal processing in filter applications. By plugging a small module into your LPT port, you can log data, count frequency or even analyse spectra. REGULARS 746 A NEW SLANT ON 715 COMMENT AN OLD ANGLE The industry we never had. Cover - Hashim Akib Irving Gottleib looks at an early solution to the problem of adjacent coil interaction. 716 NEWS Road toll trials, pcb shortage, new gas 749 A NEW sensor, surround sound from two speakers. BALANCED VIEW Steve Winder discusses a new approach 721 RESEARCH NOTES to twisted -pair coupling. Flying robot success, magnetic train breakthrough, live on the net, remote Development of a high-speed, 751 SQUARE LAW RULES IN surgery. magnetically powered train that does not levitate, is inexpensive, and can AUDIO POWER 740 APPLICATIONS run on already -laid track - page 721. The 'difference of two squares' concept Video -speed a -to -d conversion with no offers significant linearity benefits when s&h, RS232 with 1µA standby, power applied to audio power, as Ian Hegglun mosfet driving. explains. 770 LETTERS 758 RECORDING ON Arguments for terrestrial digital tv, EMI on planes, dynamos and audio design DEMAND debate. An electronic aid for reducing the tedium of note taking, designed by Francois 792 CIRCUIT IDEAS Steenkeste Remote resistance measurement 30W power amplifier, Milliohm meter, Special reader HF vco, Isolated thermometer amplifier, discount of 30% 762 FEW COMPLIMENTS Median filter, Q -meter oscillator, Plug a Pico module into the LPT port FOR Am detector with gain, and turn your pc into a spectrum Better squarewaves, Temperature analyser, 'scope, f -meter, dvm or NON- COMPLEMENTS monitor. data logger. EW+WW is offering two Douglas Self has been analysing Bengt such modules. See page 736. Olsson's work on non -complementary power amplifiers. An electro-acoustic measurement system for £750- 767 MIXED MODE representing a 20% discount exclusively for MODELLING EW+WW readers. Turn to page 780. The latest release of MicroCap features mixed -mode circuit modelling. But it is now also confined to Windows. Ben 799 NEW PRODUCTS Duncan asks "is this a feature or a Pick of the month - classified drawback?" for convenience. Next month: Probe for measuring mosfet switching losses, Triple stepper motor controller, Very fast power amplifier for instrumentation, Hybrid valve amp, Analysis circuits from energy use. Free - Circuit Ideas Pocket Book Part III Eight motorway tolling systems are about to be tested, starting next summer on a OCTOBER ISSUE - ON SALE 28 SEPTEMBER stretch of the M3, page 716. September 1995 ELECTRONICS WORLD + WIRELESS WORLD 713 "moving from schematic to layout could not be easier" KENWOOD Electronics World & Wireless World Jan 1995 TEST & MEASURING INSTRUMENTS A SUPERB RANGE OF OVER 100 on QUALITY INSTRUMENTS. PRO+ now quickroute 3.0 Available from with SPICE B.K. ELECTRONICS file export & SpiceAge Integrated Schematic and PCB Design for Windows 3.1 DDE Link! 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CIRCLE NO. 104 ON REPLY CARD 714 ELECTRONICS WORLD+WIRELESS WORLD September 1995 COMMENT EDITOR Martin Eccles The industry we never had 0181 652 3128 the industrial revolution members EDITORIAL Duringof the aristocracy wishing to spend an ASSISTANT inheritance building a steam powered car or a Rob Allcock flying machine could always fmd an artisan to 0181 652 8638 assist them. Around this relationship, Britain's industries prospered and a number of Lord & CONSULTANTS Blacksmith Ltds became world leaders. Jonathan Campbell In the early nineteen eighties it seemed Philip Darrington history might repeat itself. University Frank.Ogden professors scoured the countryside looking for DESIGN & someone to turn their designs - half of which PRODUCTION were never committed to paper - into working Alan Kerr instruments. We were on our way -a few winners; EDITORIAL personal computers, digital effects consoles - ADMINISTRATION the new industrial age. Jackie Lowe But earlier this year one of the last major 0181-652 3614 subcontractors - Race - limped off the pitch.