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Contents Vol.30, No.4; April 2017 SILICON CHIP www.siliconchip.com.au Features 14 DRED: they can turn your aircon off! It sounds like a misprint! DRED is a “feature” built into all new air conditioners and if enabled, will allow supply authorities to remotely turn your air conditioner down by 25%, 50% or even to fan-only mode – by Dr David Maddison 18 El Cheapo Modules, Part 6: Direct Digital Synthesiser This tiny DDS function generator module can produce accurate sine, square or triangle waveforms from 0.1Hz to 12.5MHz. It uses the Analog Devices AD9833 DDS chip and a 25MHz crystal oscillator and costs next to nothing – by Jim Rowe DRED allows supply authorities to control your air conditioner – without your knowledge – Page 14 79 Review: Keysight DSOX1102G Digital Oscilloscope There are a lot of compact, low-cost scopes on the market. Some undercut the Keysight on price but we doubt if any of them could compete with the sheer performance of the MegaZoom IV chipset – by Nicholas Vinen Many musicians prefer the sound of a spring reverberation unit over modern digital types – Page 26 Projects To Build 26 New Spring Reverberation Unit Can a reverb unit make a mediocre guitarist sound like a star? Maybe not, but this spring reverb unit will really lift your sound – by Nicholas Vinen 38 The eFuse: never replace another blown fuse When you’ve replaced a fuse for the nth time, you’ll wonder why you didn’t build the eFuse! Press a button and it resets – by John Clarke 53 A Digital LCD Audio ’Scope for less than $40! This build-it-yourself Chinese scope kit gives a good bang for your buck. Great for audio troubleshooting and general electronics work – by Jim Rowe Sick of replacing fuses? Just push the button on our new eFuse and it resets     itself – Page 38 68 Micromite BackPack Touchscreen DDS Signal Generator Combines a low-cost DDS module with a Micromite BackPack to produce a highly useful sine, square and triangle waveform generator with a touchscreen LCD. It’s ideal for audio and RF applications, including service work – by Geoff Graham Special Columns 58 Serviceman’s Log Stomping on the effects pedal killed it! – by Dave Thompson 76 Circuit Notebook (1) Two modifications for the Battery LifeSaver (2) Measuring weight using an Arduino (3) Simple bird scarer stops tree damage Yes! You can build a fully functioning audio LCD ’scope for under $40.00! – Page 53 84 Vintage Television Sony’s TV8-301: the world’s first direct-view transistor TV set – by Ian Batty Departments 2 Publisher’s Letter   90 4 Mailbag  95 25 SILICON CHIP Subscriptions   96 siliconchip.com.au 82 SILICON CHIP Online Shop   96 Ask Silicon Chip    Market Centre Advertising Index Notes and Errata Add a Micromite BackPack to a cheap DDS module and you have a multi-waveform function generator with LCD – Page 68 April 2017  1 www.facebook.com/siliconchipmagazine