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Contents Vol.28, No.9; September 2015 SILICON CHIP www.siliconchip.com.au Features 14 Autonomous Underwater Vehicles 4K Monitor Shootout: Which Was Best? – Page 24. Vast numbers of Autonomous Underwater Vehicles (AUVs) are in operation under the oceans around the world. We take a look at the vehicles currently in use and describe their missions – by Dr David Maddison 24 4K Monitor Shoot-Out Fancy a big, ultra-high definition (4K) monitor for your PC? We put Bauhn’s 42inch 4K TV set up against a Philips BDM4065UC 40-inch 4K monitor – by Leo Simpson & Nicholas Vinen 40 Electronex: The Electronics Design & Assembly Expo Electronex returns to Melbourne from 9-10th September Pro jects To Build 30 Senator 10-Inch Bass Reflex Loudspeakers Senator 10-Inch Bass Reflex Loudspeakers – Page 30. Did you lust after the Majestic loudspeakers described in June 2014? Now we present a much less bulky loudspeaker system, still with high efficiency and high power handling but cheaper, easier to build and even (gulp) better looking. And they sound sensational – by Leo Simpson & Allan Linton-Smith 64 USB Charger Regulator With Low-Battery Cut-Out This new version of the tiny USB supply described in the July 2015 issue now has extra circuitry to prevent any device, such as a dash-camera, from discharging the car’s battery below 12.15V – by Nicholas Vinen 78 Build A 9-Channel Infrared Remote Control USB Charger/Regulator With Low-Battery Cut-Out – Page 64. Using a tiny, prebuilt remote, this IR remote control receiver has nine outputs that can be individually configured for momentary or toggle operation. The remote can even be used to control up to three separate receivers (each with seven channels) – by John Clarke 90 Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.2 Second article has the full construction details for our new ultra-low-distortion amplifier module – by Nicholas Vinen Special Columns 61 Circuit Notebook (1) Benchtop Ignitor For Oxy-Acetylene Welding; (2) Efficient Linear MultiVoltage Regulator Build A 9-Channel Infrared Remote Control – Page 78. 68 Serviceman’s Log One tricky job & one disgusting job – by Dave Thompson 102 Vintage Radio The unique GE 675 5-transistor radio – by Ian Batty Departments 4   6 52 101 Publisher’s Letter Mailbag Product Showcase SC Online Shop siliconchip.com.au 106 111 112 112 Ask Silicon Chip Market Centre Advertising Index Notes & Errata Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.2 – Page 90. September 2015  1