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Contents Vol.20, No.8; August 2007 SILICON CHIP www.siliconchip.com.au Features 10 How To Cut Your Greenhouse Emissions; Pt.2 More surprises – how solar water heating can be environmentally worse than gas water heating, for example – by Peter Seligman 25 Ezitrak Vehicle Security System The story was all about a carjacking in Nigeria, foiled by an Aussie vehicle tracking system . . . but we wanted to know more! – by Ross Tester 36 The LM4562: a new super-low-distortion opamp This new National Semiconductor chip is used in our Class-A preamp. We discovered how difficult it was to measure its low distortion! – by Mauro Grassi 84 Review: Rigol DS5062MA Digital Storage Oscilloscope Solar hot water is good. Gas boosted solar is bettter! Page 10. A dual-channel 60MHz DSO and a real-time sampling rate of 1GS /s for under $1000? It’s a lot of scope – by Mauro Grassi Pro jects To Build 14 20W Class-A Amplifier Module; Pt.4 This low-noise, low-distortion preamp and remote volume control module complements the Class-A design perfectly – by John Clarke & Greg Swain 42 Adaptive Turbo Timer High performance preamp with I/R remote volume control – Page 14. Any vehicle with a turbo needs the capability of letting the engine run on to cool down properly. This adaptive timer does it automatically – by John Clarke 57 Subwoofer Controller All the features you want in a Subwoofer Controller, including low and highpass filter, parametric equaliser, sub amp switching and more – by Jim Rowe 72 Build A 6-Digit Nixie Clock, Pt.2 We introduced it last month – now you get to build this amazing retro clock with its warm glowing Nixies and contrasting blue LEDs – by David Whitby Special Columns 30 Circuit Notebook • 12V or 24V Traffic Indicator • Airflow Detector using a torch bulb • Freezer Alarm with LED temperature readout • PICAXE thermostat for a 240V heater • White LED touch light • MP3 player remote control Adaptive Turbo Timer to protect your engine – Page 42. 38 Serviceman’s Log Serviceman of the Overflow – by the TV Serviceman 90 Vintage Radio Restoring an AWA 948C Car Radio– by Rodney Champness Departments   2 Publisher’s Letter   4 Mailbag 79 Order Form siliconchip.com.au 87 Product Showcase 96 Ask Silicon Chip 102 Market Centre Subwoofer controller with all bells, no whistles – Page 57. August 2007  1