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Contents Vol.37, No.06 June 2024 16 Privacy Phones Modern smartphones are invaluable, letting you look up information nearly anywhere, but the tradeoff is that your data is collected when using the phone and online services. So what can you do to reduce your ‘footprint’? By Dr David Maddison, VK3DSM Online privacy 32 Electronex 2024 Electronex – the Electronics Design and Assembly Expo – is being held at Rosehill Gardens Event Centre, Sydney, on the 19th & 20th of June this year in conjunction with the SMCBA Conference. Entry is free for all visitors. By Noel Gray (AEE) Electronics exhibition 64 MicroMag3 Magnetic Sensor The MicroMag3 measures the strength of a magnetic field in three axes (north-south, east-west and up-down). It can be used as a magnetic compass and inclinometer. By Jim Rowe Using electronic modules 46 Jaycar-sponsored Mini Projects This month’s set of Mini Projects includes a self toggling relay and an Arduino-based clap-activated switch that can be used to turn devices on or off remotely. Each project is designed so that anyone can build it. By Tim Blythman Mini projects 54 ESR Test Tweezers Privacy Phones Page 16 ElectroneX 2024 Rosehill Gardens, June 19-20 Page 32 Page 54 ESR TEST TWEEZERS Page 64 MicroMag3 3-axis Magnetic Sensor 2 Editorial Viewpoint 5 Mailbag 31 Subscriptions 90 Serviceman’s Log 96 Circuit Notebook 99 Vintage Radio 106 Online Shop 108 Ask Silicon Chip 82 WiFi DDS Function Generator, Pt2 111 Market Centre This Function Generator provides two wide-range, low distortion outputs and can be controlled from its touchscreen or remotely via a WiFi connection. In this final part of the series we detail building and operating it. By Richard Palmer Test equipment project 112 Advertising Index 112 Notes & Errata This new version of our Test Tweezers line has the handy capability of measuring capacitor ESR (equivalent series resistance) and capacitance. It can do all of this in a compact form factor using just a single 3V cell. By Tim Blythman Test equipment project 68 USB-C Serial Adaptor Despite being introduced nearly a decade ago, many USB serial adaptors with Type-C sockets do not properly adhere to the standard or have driver problems. So we’ve designed a simple project to give you a proper adaptor. By Tim Blythman Computer interface project 74 DC Supply Protectors We have designed three different DC Supply Protectors to help you protect equipment from malfunctioning or incorrect power supplies. They all feature protection from overvoltage and reverse polarity. By John Clarke Circuit protection project 1. USB serial data interceptor 2. NPN/PNP transistor tester 3. Bin reminder using an Arduino 4. Programming a Micromite over Bluetooth HeathKit GW-21A handheld transceivers