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Contents SILICON CHIP www.siliconchip.com.au Vol.26, No.3; March 2013 Features 14 Oscium Test Instrument Add-Ons For The iPad Got an iPad? Oscium’s trio of hardware add-ons (plus an app) turns it into a scope, spectrum analyser and a logic analyser – by Nicholas Vinen 53 We Test Some New Hearing Aids Just how good are the new SIE-64 digital hearing aids from Blamey & Saunders? We took them for a trial run to find out – by Ross Tester 74 Programmable Systems on a Chip (PSoC) Microcontrollers, DSPs & FPGAs have revolutionised the electronics industry. Now Cypress Semiconductor is taking the next logical step with their ingenious Programmable System on a Chip (PSoC) – by Nicholas Vinen High Performance CLASSiC DAC; Pt.2 – Page 18. Pro jects To Build 18 High Performance CLASSiC DAC; Pt.2 Build it and get better sound from your TV, DVD/CD player or set-top box. Pt.2 has the full circuit details – by Nicholas Vinen 30 Infrasound Detector For Low Frequency Measurements Are wind turbines making you sick? Is building vibration making you nauseous? Build this low-cost Infrasound Detector and measure sound and vibration frequencies way below the limits of human hearing – by Allan Linton-Smith 62 Automatic Points Controller For Model Railways It uses two IR sensors to detect an approaching train and automatically switch a set of points – by Jeff Monegal 68 Capacitor Discharge Unit For Twin-Coil Points Motors Does your model railway have one, two or maybe dozens of sets of points? If so, you need at least one Capacitor Discharge Unit (CDU) to power them. This simple unit is dirt-cheap to build – by Jeff Monegal Infrasound Detector For Low Frequency Measurements – Page 30. 70 Control Relays Via The Internet With Arduino It’s easy to control four or more relays over the Internet using open-source Arduino-based hardware – by John Boxall 78 AAA-Cell LED Torch Driver This project works but it’s not economically viable. So why are we publishing it? Because it’s an interesting idea – by John Clarke & Ross Tester Special Columns Automatic Points Controller For Model Railways – Page 62. 40 Circuit Notebook (1) Residual Current Device (RCD) Tester; (2) Airconditioner Controller For Cars; (3) High & Low Mains Voltage Alarm; (4) Soft Start For 6/12V Toy Car Motors 56 Serviceman’s Log PC power supplies: not worth fixing 82 Vintage Radio Seyon 2D 2-valve “wireless” and an old single-valve receiver Departments    4 Publisher’s Letter siliconchip.com.au   5 Mailbag 87 Subscriptions 88 Partshop & Order Form 90 Ask Silicon Chip 95 Market Centre Control Relays Over The Internet With Arduino – Page 70. March 2013  1