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Vol.8, No.8; August 1995 Contents FEATURES 4 Electronic Diesel Engine Management Electronic technology is greatly improving the performance of diesel engines. Here’s a look at the electronic control system used by Detroit Diesel on truck engines – by Julian Edgar 14 133MHz Pentium Processor Now Available FUEL INJECTOR MONITOR FOR CARS – PAGE 24 The Pentium is about to become the mainstream processor in PCs. We take a look at its main features & give some details on Intel’s latest 133MHz Pentium processor PROJECTS TO BUILD 18 Vifa JV-60 2-Way Bass Reflex Loudspeaker System These new 60-litre systems use two 170mm woofers & a tweeter with a ferro-fluid voice coil – by Leo Simpson 24 A Fuel Injector Monitor For Cars This circuit monitors the fuel injectors & displays a reading that’s directly proportional to the injector opening time – by Rick Walters 30 A Gain-Controlled Microphone Preamp Use it with PA systems to maintain a constant level – by John Clarke 54 Audio Lab: A PC-Controlled Audio Test Instrument Monitors frequency, resistance, capacitance, and AC & DC voltage; and performs frequency response plots – by Roger Kent 60 Build The Mighty-Mite Powered Loudspeaker It uses a miniature IC & delivers an output of 1W – by John Clarke 75 Build A 6-12V Alarm Screamer Module It comes as a kit & puts out 110dB of noise SPECIAL COLUMNS 40 Serviceman’s Log It took a little longer than usual – by the TV Serviceman VIFA 60-LITRE 2-WAY BASS REFLEX LOUDSPEAKER SYSTEM– PAGE 18 72 Computer Bits An easy way to identify IDE hard disc drive parameters – by Geoff Cohen 80 Vintage Radio A couple of odd radio repairs – by John Hill DEPARTMENTS 2 Publisher’s Letter 37 Mailbag 38 Circuit Notebook 53 Bookshelf 59 Order Form 86 Product Showcase 90 Ask Silicon Chip 94 Market Centre 96 Advertising Index 94 Notes & Errata PC-CONTROLLED AUDIO TEST INSTRUMENT TO BUILD – PAGE 54 August 1995  1