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Contents Vol.20, No.6; June 2007 SILICON CHIP www.siliconchip.com.au Features 10 VAF’s New Soundwall Is it a wall or is it a loudspeaker? – by Ross Tester 12 Turntables – Give ’em A Spin; Pt.2 We look at the software you’ll need to clean up those old vinyl recordings and save them to CD – by Barrie Smith 78 The Latest PICAXE Developments PICAXE designers Revolution Education Ltd have been hard at work. Here’s a look at the latest developments in the PICAXE world – by Clive Seager Building Mirror Image Class-A Amplifier Modules – Page 20. 86 A Flying Visit To CeBIT Australia 2007 There were lots of interesting products at this year’s show – by Ross Tester Pro jects To Build 20 20W Class-A Amplifier Module; Pt.2 Building mirror-image left and right channel modules, plus power supply circuit and assembly details – by Leo Simpson 42 A Knock Detector For The Programmable Ignition Use it to help program ignition timing and/or to automatically retard the ignition timing in response to engine knock levels – by John Clarke 58 Versatile 4-Input Mixer With Tone Controls Knock Detector For The Programmable Ignition – Page 42. New design features tone controls, a headphone amplifier and four low-noise inputs that can be configured to suit your signal sources – by Jim Rowe 75 Fun With The New PICAXE 14-M Here’s a close-up look at the new kid on the block – by Stan Swan 82 Frequency-Activated Switch For Cars A cheap, adjustable design that lets you switch devices on and off according to speed – by John Clarke & Julian Edgar 89 Simple Panel Meters Revisted Woops!! Several readers have had problems but not of their own making – by Ross Tester Special Columns 38 Circuit Notebook (1) Simple Battery Isolator; (2) Using The PICAXE In SPI Mode; (3) LED Stroboscope Uses A Frequency Counter To Measure RPM; (4) Egg Timer 4-Channel Mixer – Page 58. 70 Serviceman’s Log The need to eat and pay bills – by the TV Serviceman 90 Vintage Radio DC-To-AC Inverters From The Valve Era – by Rodney Champness Departments   4   6 57 81 Publisher’s Letter Mailbag Product Showcase Order Form siliconchip.com.au 96 Ask Silicon Chip 99 Notes & Errata 102 Market Centre Frequency Switch For Cars – Page 82. June 2007  1