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Vol.7, No.1; January 1994 FEATURES FEATURES   4 The World Solar Challenge by Brian Woodward Honda wins at a record pace THIS 1.23-40V 3A VARIABLE power supply features a highefficiency switching regulator, preset current limiting, full overload protection & an LCD panel meter. Construction starts on page 16.   7 What’s New In Car Electronics? by Julian Edgar Mazda’s Collision Avoidance System   8 Electronic Engine Management, Pt.4 by Julian Edgar Changing the system 30 Luxman A-371 Amplifier & D-351 CD Player by Leo Simpson High quality equipment with no gimmicks 37 Active Filter Design For Beginners by Elmo Jansz A quick primer to get you started 88 Review: Kenwood’s DCS-9120 Oscilloscope by John Clarke Features both digital & analog modes of operation PROJECTS PROJECTS TO TO BUILD BUILD 16 Build A 40V 3A Variable Power Supply by John Clarke Full overload protection, an LCD panel meter & a switching regulator 40 A Switching Regulator For Solar Panels by Otto Priboj Can be used to charge 12V or 24V battery banks IF YOU USE SOLAR PANELS, you need an efficient regulator to ensure that any associated batteries are correctly charged. This unit can be built in two versions (10A or 20A) and can charge a 12V or 24V battery band – see page 40. 44 Printer Status Indicator For PCs by Darren Yates An alphanumeric display indicates printing problems 50 Simple Low-Voltage Speed Controller by Darren Yates Will control 12V DC motors or lights 80 Control Stepper Motors With Your PC by Marque Crozman You build an interface circuit & buy the software SPECIAL SPECIAL COLUMNS COLUMNS 52 Vintage Radio by John Hill Realism Realized – the Precedent console receiver 56 Serviceman’s Log by the TV Serviceman It was all a long time ago ARE YOU OFTEN frustrated by files which disappear down your printer cable but don’t print out? This printer status indicator uses an alphanumeric display panel to indicate problems as they occur. Details page 44. 65 Computer Bits by Darren Yates Even more experiments for your games card 70 Remote Control by Bob Young More on servicing your R/C transmitter DEPARTMENTS DEPARTMENTS   2 24 29 68 Publisher’s Letter Circuit Notebook Order Form Back Issues 90 93 95 96 Product Showcase Ask Silicon Chip Market Centre Advertising Index THE LUXMAN company in Japan has a reputation for high quality audio equipment with no unnecessary frills or gimmicks. This month, we review their A-371 stereo amplifier & D-351 CD player. Turn to page 30. January 1994  1