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Contents Vol.28, No.12 – December 2015 SILICON CHIP www.siliconchip.com.au Features   14  The 2015 Bridgestone World Solar Challenge On October 18th, 42 solar-powered cars from 25 countries left Darwin in the Northern Territory for the ~3000km drive to Adelaide, South Australia. We take a look at the cars and the technology behind them – by Ross Tester   24  The Largest Astronomical Image Of All Time Astronomers at the Ruhr-Universität Bochum in Germany have compiled a picture of the Milky Way which contains 46 BILLION pixels – by Ross Tester High-Visibility 6-Digit LED GPS Clock – Page 36.   26  Super & Ultra-Super-Critical Steam Power Stations Coal-fired power stations are out of favour because of CO­­2 emissions but they can be made much more efficient. Here’s a look at super-critical and ultrasupercritical steam power stations – by Dr David Maddison   46  High-Quality Audio Transformers From Sweden Lundahl of Sweden produce a range of high-quality power, audio coupling, valve output and audio/video isolation transformers Pro jects To Build   36  High Visibility 6-Digit LED GPS Clock Want a really bright 6-digit clock that you can see at a considerable distance? Would you like it to have GPS time precision with automatic time zone and daylight saving adjustment? Have we got a clock for you! – by Nicholas Vinen White LED 100/120Hz Strobe For Checking Turntable Speeds – Page 62.   62  Check Turntable Speed With This White LED Strobe Have you resurrected your turntable? You used to be able to check its speed using an incandescent lamp and a strobe disc but modern lamps won’t work in the role. This 100/120Hz White LED Strobe is the answer – by John Clarke   68  Speech Timer For Contests & Debates Stop speakers from droning on past their allotted time with this Speech Timer. It can count up or down, has a large 3-digit display, three large warning LEDs and a buzzer. And it’s operated by a tiny infrared remote control – by John Clarke   84  Arduino-Based Fridge Monitor & Data Logger Monitor the temperature and humidity in your refrigerator (or elsewhere) remotely with this Arduino-based device. It can also log these parameters over time so you can see how they vary – by Somnath Bera Special Columns Speech Timer For Contests & Debates – Page 68.   57  Serviceman’s Log The security tag on the champers – by Dave Thompson  88 Circuit Notebook (1) LED Light Curtain Stops Garage Door Damage To Cars; (2) Simple Circuit Modulates LEDs To Music; (3) °C/°F Digital Thermometer With Alarm   92  Vintage Radio A practical guide to vibrator power supplies – by John Hunter Departments    2 Publisher’s Letter   99 Ask Silicon Chip   4 Mailbag    103 Market Centre siliconchip.com.au  23 SC Online Shop    104 Advertising Index  48 Product Showcase    104 Notes & Errata Arduino-Based Fridge Monitor & Data Logger – Page 84. December ecember 2015  1