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Contents Vol.31, No.4; April 2018 SILICON CHIP www.siliconchip.com.au R&S RTM3004 touchscreen ’scope has 100MHz bandwidth and is upgradeable to 1GHz – Page 36 Features & Reviews 36 Review: Rohde & Schwarz RTM3004 The R&S RTM3004 gives you the best of both worlds in a single ’scope: great vertical resolution and low noise, along with high speed performance. It’s also very easy to use thanks to its touchscreen interface – by Nicholas Vinen 70 New “Facett” hearing aids from BlameySaunders They look quite different from previous models – not just because of their “facetted” design. These use rechargeable battery modules which snap into place using tiny, powerful magnets. But are they any good? – by Ross Tester 76 El Cheapo Modules 15: ESP8266-based WiFi module The very popular ESP-01 WiFi transceiver module, based on the ESP2866 chip, is designed to allow almost any microcontroller to connect to a WiFi network. And best of all: as well as being versatile, they’re really cheap – by Jim Rowe Constructional Projects 14 230VAC Thermopile-based Heater Controller Here comes winter! But many radiators don’t have any form of heat control – they’re either flat out or off – not very satisfactory, as you either cook or freeze! This controller has two versions – dial up the temperature you want or vary the heat output over a wide range – by John Clarke New “FACETT” hearing aids look very different – and also use rechargeable magnetic battery modules – Page 70 Low cost ESP8266-based WiFi module allows you to interface almost any micro to a WiFi network! – Page 76 26 Low cost, Arduino-based 3-Axis Seismograph Following on from last month’s Earthquake Warning Alarm, we add some extra hardware and software . . . and voila: a true Seismograph, capable of detecting and recording waves in three directions. We even show you how to record and analyse them – by Tim Blythman and Nicholas Vinen 58 The Clayton’s “GPS” time signal generator You don’t need a GPS receiver to get accurate time signals – you can get them with WiFi. So accurate you won’t tell the difference and you can use them as a true time reference in critical applications – or just have a time signal that’s as accurate as the “pips” on the radio! – by Tim Blythman Your Favourite Columns You can now give your 230VAC convection or bar electric radiator dial-up temperature control or vary the heat output – Page 14. 40 Serviceman’s Log Why won’t they let me program MY alarm? – by Dave Thompson 53 Circuit Notebook (1) Temperature and humidity display using PIC16F88 (2) Electric guitar/violin preamp runs off USB supply (3) Recycling old hard disk spindle motors (4) Simple valve radio battery eliminator 84 Vintage Radio 1962 Astor M2 Cry-baby: radio, intercom and baby monitor in one – by Ian Batty Everything Else! 2 Editorial Viewpoint   95 Market Centre 4 Mailbag – Your Feedback    96 Advertising Index 89 Ask SILICON CHIP    96 Celebrating Notes and siliconchip.com.au 30 Errata Years 92 SILICON CHIP Online Shop A true 3-axis Seismograph that can detect and record earthquake waves in all directions – Page 26 If you can’t get a reliable GPS signal (or don’t have a GPS receiver) this internet time signal generator will do the trick! – Page 58 April 2018  1 www.facebook.com/siliconchipmagazine