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Contents Vol.32, No.6; June 2019 Features & Reviews 14 From a knotted rope to side-scanning SONAR The latest side scan and multibeam sonar systems are helping to build an accurate map of the seabed; even finding sunken ships and aircraft. It’s called “bathymetry” and it has come a long way from ropes with knots in them – by Dr David Maddison SILICON CHIP www.siliconchip.com.au Side scanning and multibeam sonar are changing the way we see the seabed – Page 14 40 e-Paper displays: no paper involved! Small e-Paper Displays (also known as e-Ink) are now becoming available as electronic modules, making them usable by hobbyists. In this article, we explain what they do, how to use them and where to get them – by Tim Blythman 88 El Cheapo Modules: Long Range (LoRa) Transceivers Connecting a couple of computers, Arduinos, Micromites or other micros via a UHF wireless data link is easy if you use a pair of low-cost modules based on the SX1278 ultra-low-power LoRa modem/transceiver chip – by Jim Rowe Constructional Projects 26 An AM/FM/CW Scanning HF/VHF RF Signal Generator Here’s one for amateurs or anyone interested in HF/VHF radio. This low-cost, easy-to-build and user-friendly RF signal generator covers from 100kHz–50MHz and 70–120MHz, and is usable up to 150MHz – by Andrew Woodfield, ZL2PD If you’re into HF or VHF radio you’re going to LOVE this AM/FM/CW Scanning RF Signal Generator – Page 26 e-Paper displays are suitable for a wide range of hobbyist projects. We explain them and tell you how to use them – Page 40 45 Steering Wheel Audio Button To Infrared Adaptor Most new cars have push-button controls on the steering wheel to control the incar audio system. But what if you update your audio system? We take advantage of the usual inbuilt infrared control to regain push-button control – by John Clarke 68 Very accurate speedo, car clock & auto volume change Based on a GPS signal, this gives you a MUCH more accurate speed than your vehicle’s speedometer (which you shouldn’t trust!), a very accurate clock – and it will vary your car audio volume depending on your speed! – by Tim Blythman 77 DSP Active Crossover and 8-channel Parametric Equaliser Part Two has all the construction details (including parts lists) for the superb hifi stereo digital signal processor (DSP), two-way active crossover and eight channel parametric equaliser introduced last month – by Phil Prosser and Nicholas Vinen Your Favourite Columns 62 Serviceman’s Log Fixing a “cheap as” set of “cans” – by Dave Thompson 94 Circuit Notebook (1) Touchscreen clock radio using a Micromite LCD BackPack (2) Control an aircon with an RTC and two micros (3) Diode/transistor/Mosfet tester 100 Vintage Radio AWA Radiola Model 137– by Rob Leplaw Everything Else! 2 Editorial Viewpoint 4 Mailbag – Your Feedback siliconchip.com.au 61 Product Showcase   104 SILICON CHIP ONLINE SHOP 106 111 112 112 Ask SILICON CHIP Market Centre Advertising Index Notes and Errata If you’ve updated your car sound system you probably know that the steering wheel push-buttons no longer work! With this project they can work once again . . . – Page 45 Your car speedo can be out by several km/h! This one is GPS based so it’s spot on! And it has other functions too! – Page 68 We introduced our new DSP, Active Crossover, and 8-channel parametric equaliser last month. Now we get to the fun part – building it! – Page 77 www.facebook.com/siliconchipmagazine