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Contents Vol.34, No.5 May 2021 SILICON CHIP www.siliconchip.com.au Features & Reviews 12 Digital Radio Modes – Part 2 Continuing on from last month, this article focuses mostly on transmission modes used by amateur radio enthusiasts, plus mesh networks, LoRa and offgrid communication – by Dr David Maddison 61 Review: EVOR04 Audio Analyser This $110 device incorporates a spectrum analyser, oscilloscope, VU meter and a frequency meter plus it’s controlled using a 3.5-inch touchscreen display – by Allan Linton-Smith 86 The History of Videotape – Cassette Systems Cassettes quickly became the most popular videotape format due to their size and ease-of-use, even commercially. This was led by one of the earliest format wars, between Betamax and VHS – by Ian Batty, Andrew Switzer & Rod Humphris This remote-controllable Lab Supply can even be set up as a group, making it possible to use it as a tracking supply. Each unit is compact, fitting into an ABS case measuring 260 x 190 x 80mm – Page 24 Constructional Projects 24 Programmable Hybrid Lab Supply with WiFi – Part 1 This Lab Supply can deliver up to 18V at 5A (and higher voltages at slightly lower currents) and allows you to remotely control it over WiFi. It has current limiting, soft-start and voltage/current monitoring. Since the supply is programmable, it could be used for automated testing etc – by Richard Palmer 38 Digital FX (Effects) Pedal – Part 2 This device has a real-time stereo audio analyser via 31band FFT analysis – a feature that was previously only available on specialist equipment – Page 61 This final article in the series covers how you can create and then install different effects into your unit’s EEPROM using SpinCAD Designer and SpinASM – by John Clarke 46 Arduino-based MIDI Soundboard – Part 2 We’ll show you how you can control the MIDI Soundboard using Androidbased smartphones and tablets, along with some software that can be used to further enhance it – by Tim Blythman 64 Variac-based Mains Voltage Regulation Using a motor to drive a Variac provides one of the easiest ways to supply a constant AC voltage for sensitive equipment. Building on this, we can make our own mains voltage regulator using a Variac – by Dr Hugo Holden Your Favourite Columns 83 Circuit Notebook (1) Revised GPS Analog Clock for NTP module (2) Simple DMM calibrator (3) Infrared remote control jammer Variacs provide a way to deliver a constant mains voltage. This means you can use one to build your own mains regulator – Page 64 96 Serviceman’s Log Some jobs are much harder than they should be – by Dave Thompson 103 Vintage Workbench 1972 BWD 141 audio generator – by Ian Batty Everything Else 2 Editorial Viewpoint 4 Mailbag – Your Feedback 37 Silicon Chip Online Shop siliconchip.com.au 102 Product Showcase 108 Ask Silicon Chip 111 Market Centre 112 Notes and Errata Australia’s electronicsIndex magazine 112 Advertising The introduction of cassettes was a big change to consumers and even professionals, eventually culminating in the incredibly popular VHS format – Page 86 May 2021  1 www.facebook.com/siliconchipmagazine