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Vol.8, No.12; December 1995 Contents FEATURES 4 Knock Sensing In Cars Knock sensing is an important feature in modern cars and allows optimum performance while protecting the engine against possible damage. Here’s a rundown on how it works – by Julian Edgar 12 The Pros & Cons Of Toroidal Power Transformers Toroidal transformers have a number of advantages compared to conventional units. We examine their pros & cons – by Michael Larkin 92 Index To Volume 8 KNOCK SENSING IN CARS: HOW IT WORKS – PAGE 4 All the articles, projects and features for 1995 PROJECTS TO BUILD 8 Build An Engine Immobiliser For Your Car This simple circuit will repeatedly stall your car’s engine if a thief tries to start it and drive away – by John Clarke 22 Five Band Equaliser Uses Two Low-Cost ICs Build this circuit and customise the sound from your keyboard or guitar. It’s easy to assemble and has low noise and distortion – by John Clarke 28 CB Transverter For The 80M Amateur Band, Pt.2 The final wiring details plus the test and alignment procedure – by Leon Williams 39 Build A Subwoofer Controller Team this unit with a subwoofer loudspeaker for lots a low-down bass – by Leo Simpson BUILD AN ENGINE IMMOBILISER FOR YOUR CAR – PAGE 8 70 Dolby Pro Logic Surround Sound Decoder, Mk.2 Build this unit for big-theatre movie sound in your own home. This second and final article has the assembly and test details – by John Clarke SPECIAL COLUMNS 54 Serviceman’s Log Stop me if you’ve heard this one – by the TV Serviceman 64 Computer Bits Ram Doubler: extra sauce without the chips – by Geoff Cohen 81 Remote Control The mysteries of mixing –­by Bob Young FIVE BAND EQUALISER USING TWO LOW-COST ICs – PAGE 22 86 Vintage Radio Back to “original” – the Radiola 34E – by John Hill DEPARTMENTS 2 Publisher’s Letter 15 Bookshelf 16 Circuit Notebook 53 Order Form 60 Product Showcase 84 Mailbag 90 Ask Silicon Chip 91 Notes & Errata 95 Market Centre 96 Advertising Index SUBWOOFER CONTROLLER FOR LOTS OF BASS – PAGE 39 December 1995  1