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Contents SILICON CHIP www.siliconchip.com.au Vol.24, No.6; June 2011 Fea tures 14 The FutureWave Energy Saver At last: here’ s an energy saver that actually does save energy! It’s specifically intended for use with certain electric motors, especially as used in swimming pool and spa pumps – by Ross Tester 22 Rescuing Electronic Gear After The Flood The devastating Queensland floods wiped out a lot of electronic gear. Here’s how some high-end radio gear was rescued and restored – by Robert Googe 74 HiFi Review: Marantz CD6003 CD Player DVD players can give good results when playing audio CDs but a dedicated CD player is still the best way to go. This high-quality CD player from Marantz features pitch control, a USB input and lots of other goodies – by Leo Simpson 20A 12/24V DC Motor Speed Controller Mk.2 – Page 28. Projects To Build 28 20A 12/24V DC Motor Speed Controller Mk.2 This gutsy little motor speed controller is easy to build and features low-battery protection, soft start and adjustable pulse frequency. It can run from 12V or 24V batteries at currents up to 20A – by John Clarke 36 USB Stereo Recording & Playback Interface Want to use your laptop or PC to record high-quality stereo audio? This USB interface unit features balanced mic inputs, stereo analog line inputs & outputs, an S/PDIF digital audio input and an S/PDIF output – by Jim Rowe 62 VersaTimer/Switch With Self-Latching Relay Do you have a switching application (up to 230VAC) that calls for a relay but needs very low current drain? Here’s a micropower switch that also functions as a programmable timer and/or 12V battery protector – by John Clarke USB Stereo Recording & Playback Interface – Page 36. 80 A Handy USB Breakout Box For Project Development It connects between two USB cables and lets you examine the D+ and Dsignal line activity with your scope and the current flow – by Jim Rowe Special Columns 57 Serviceman’s Log There’s just no pleasing some people – by the Serviceman 83 Circuit Notebook (1) Wireless Doorbell Relay Driver; (2) Microphone Adaptor For A Violin; (3) Diesel Engine Watchdog Circuit Monitors Oil Pressure & Water Temperature; (4) PICAXE-Based Metronome With Accented Beat; (5) Multi-Decade PeriodMultiplier For Precision Frequency Comparisons 90 Vintage Radio VersaTimer Switch With SelfLatching Relay – Page 62. 62. Radio manufacturing in 1925: the Wells Gardner story – by Kevin Poulter Departments   2   4 88 95 Publisher’s Letter Mailbag Product Showcase Order Form siliconchip.com.au 98 Ask Silicon Chip 102 Notes & Errata 103 Market Centre A Handy USB Breakout Box – Page 80. June June 2011  1 2011  1