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Contents Vol.29, No.2; February 2016 SILICON CHIP www.siliconchip.com.au Features 14 Defibrillators Save Lives Designed to give the heart a high-voltage “whack”, Automatic External Defib­rillators (AEDs) are now considered just as important as CPR in reviving sudden cardiac arrest (SCA) victims – by Ross Tester 62 Crowd Funding: Kickstarter & “The Joey” Have you got a great idea for an electronic product? You’ve designed it and it works but how do you cover the cost of building the first batch? Kickstarter may be the answer – by Steve OBrien & David Meiklejohn Micromite LCD BackPack TouchScreen Display – Page 20. 78 Review: Keithley’s 2460 Sourcemeter This versatile unit from Keithley is a programmable 100W DC power supply and load combined with a 6.5-digit DMM. It can be controlled via its large touch screen or from a PC via its USB input and can also be used to plot a wide range of parameters for high-power semiconductor devices – by Jim Rowe Pro jects To Build 20 Micromite LCD BackPack With Touch-Screen Display Add a touch-screen LCD to your next project with the Micromite LCD BackPack. It combines a colour touch-sensitive LCD panel with a low-cost 32-bit micro­ controller running BASIC and packs an incredible amount of power at an amazingly low price – by Geoff Graham Versatile Solar MPPT Charge & Lighting Controller, Pt.1 – Page 30. 30 Solar MPPT Charger & Lighting Controller, Pt.1 This MPPT charger/light controller will work with 12V or 24V solar panels to charge a 12V or 24V lead-acid or lithium iron phosphate battery. You can then use the battery to run 12V DC lighting or to power a 12V/24V 230VAC inverter to run lighting or drive other loads – by John Clarke 54 Raspberry Pi Temperature/Humidity/Pressure Monitor, Pt.2 Second article shows you how to install the system in a clear acrylic case and stream the sensor readings to a web-server so that you can access them over the internet using a web browser – by Greg Swain 74 Valve Stereo Preamplifier For HiFi Systems, Pt.2 Last month, we described how our new stereo valve preamp works and how to build the PCB. This month, we show how to house it in an eye-catching customdesigned case made from clear acrylic – by Nicholas Vinen Special Columns Accessing RPi Temperature, Humidity & Pressure Readings Via The Internet, Pt.2 – Page 54 38 Serviceman’s Log Batteries need careful maintenance – by Dave Thompson 70 Circuit Notebook (1) Digitally-Controlled Audio Preamplifier With Four Stereo Inputs; (2) Low Voltage Warning For A Lithium Cell; (3) Combined Games Timer & Electronic Dice 82 Vintage Radio The 1948 Healing L502E 5-valve radio – by Graham Parslow Departments 2 Publisher’s Letter   4 Mailbag 44 Product Showcase siliconchip.com.au 88 SC Online Shop 90 94 95 96 Ask Silicon Chip Notes & Errata Market Centre Advertising Index Valve Stereo Preamp For HiFi Systems, Pt.2 – Page 74. February 2016  1