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Contents SILICON CHIP www.siliconchip.com.au Vol.25, No.7; July 2012 Features 12 Peter Olsen & His Flashing School Lights They use PICAXE microcontrollers and they’re a lot cheaper than the flashing lights installed by the RTA (now the RMS) – by Ross Tester 16 The Square Kilometre Array: Australia Misses Out The Square Kilometre Array involved a bidding contest to build a $2.5 billion radio telescope. Australia (mostly) lost and South Africa won – by Geoff Graham Soft Starter For Power Tools – Page 22. 22. 48 The Freetronics “Leostick” USB-Capable Microcontroller This 8-bit microcontroller board is the size of a flash drive, is compatible with the Arduino system and plugs straight into a USB port – by Nicholas Vinen 76 Modifying CD-ROM Motors For High Power Operation It’s easy to convert the flea-power motors from CD/DVD-ROM drives to highpower operation for model aircraft or other uses – by Dave Thompson Pro jects To Build 22 Soft Starter For Power Tools Do your power tools kick like a mule when you squeeze the trigger? Build this project and eliminate starting kick-back – by Nicholas Vinen 30 Wideband Oxygen Sensor Controller Mk.2, Pt.2 Building The Wideband Oxygen Sensor Controller Mk.2 – Page 30. Second article describes the circuit for the LED display unit and gives the full construction details – by John Clarke 64 10A DCC Booster For Model Railways Give your model train layout some real grunt with this unit. It lets you run lots of locos and peripherals such as sound effects and lighting – by Jeff Monegal 84 6-Decade Capacitance Substitution Box Need to experiment with capacitance values? This capacitance decade box makes it easy to find the right value for your circuit – by Nicholas Vinen Special Columns 10A DCC Booster For Model Railways – Page 64. 42 Serviceman’s Log The solar panel system that almost caught fire 58 Circuit Notebook (1) PICAXE-Based Wireless Electricity Monitor; (2) A Really Simple Metal Detector; (3) Modifying An Urn To Save Power; (4) Capacity Test Circuit For Rechargeable Cells; (5) Simple Circuit For Checking IF Coil Frequency 6-Decade Capacitance Substitution Box – Page 84. 90 Vintage Radio The AWA 157P 7-transistor portable radio – by Rodney Champness Departments   2   4 57 97 Publisher’s Letter Mailbag Product Showcase Order Form siliconchip.com.au 98 Ask Silicon Chip 103 Market Centre 104 Notes & Errata July 2012  1