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Contents Vol.28, No.11; November 2015 SILICON CHIP www.siliconchip.com.au Features   16  The Promise Of Organic Electronics Organic semiconducting materials will enable the fabrication of large, cheap printable solar panels, cheap disposable medical sensors, flexible display screens, ultra-cheap RFID tags and cheap, disposable chemical sensors – by Dr David Maddison Fingerprint Access Controller – Page 26.   80  Magnifiers: When You Want A Really Close-up View USB microscopes and other magnification aids are invaluable if you are working with SMDs, if you’re in the repair business or if your eyesight “isn’t what it used to be”. Here’s a rundown on the various optical service aids that are available – by Ross Tester Pro jects To Build   26  Open Doors With This Fingerprint Access Controller Forget about fumbling around for keys. Now you can open your front door, security gate or garage door with this Fingerprint Access Controller and an electric door strike – by John Clarke   36  A 5-Element Antenna For Better DAB+ Reception Its 12dB gain means that you’ll pull in those DAB+ stations you never knew existed. We also show you how to fit a socket to a portable DAB+ radio so that you can connect the antenna – by Leo Simpson 5-Element DAB+ Antenna – Page 36.   62  A Universal Loudspeaker Protector Protect your expensive loudspeakers from catastrophic amplifier faults with this new Loudspeaker Protector. It also mutes switch-on and switch-off thumps, disconnects the speakers if you plug in your headphones and has heatsink temperature sensing in order to control a fan in the amplifier – by Nicholas Vinen   76  A Cheap Programmer For The PIC32 Microcontroller This minimal programmer will upload firmware into a PIC32 micro quickly and simply at very low cost – by Robert Rozée, M.E. (EEE) Special Columns   54  Serviceman’s Log Ultimate servicing and my run of bad luck – by Dave Thompson Universal Loudspeaker Protector – Page 62.  72 Circuit Notebook (1) 4-Speed Gear Indicator Uses A Single 7-Segment LED Display; (2) Sidereal Clock Uses Arduino Flight Controller & Display Modules; (3) A 3-Channel DataLogger With OLED Display; (4) Attenuator For Active Probe Unit   84  Vintage Radio The General Electric P-807 5-Transistor Set – by Ian Batty Departments     4  Publisher’s Letter   6 Mailbag  53 Product Showcase   88  SC Online Shop siliconchip.com.au   91  Ask Silicon Chip  95 Market Centre  96 Advertising Index   96  Notes & Errata Cheap Programmer For PIC32 Microcontrollers – Page 76. N November ovember 2015  1