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Contents Vol.36, No.09 September 2023 10 Electronex & AMW Report There were some interesting exhibits to see at Electronex and Australian Manufacturing Week (AMW) this year, so here’s a rundown of what we thought were the most fascinating products & services at both events. By Dr David Maddison Trade show report 36 pH Meter Module This module is designed for use as a liquid pH meter to test a swimming pool or the water in a fish tank. It comes with two separate pH probes and can be interfaced by an Arduino or similar microcontroller. By Jim Rowe Using electronic modules 44 100 Years of Broadcast Radio November 23rd 1923 was the date of the first licensed radio broadcast in Australia, by 2SB in Sydney (renamed 2BL). The story of broadcast radio was highly political, commercially competitive and steeped in controversy. By Kevin Poulter Historical feature 18 Salad Bowl Speakers These stylish speakers are surprisingly good performers considering they’re made using salad bowls from IKEA. They are simple to build and can handle 50W RMS per channel. By Phil Prosser Audio project 57 Coffee Grinder Timer Improve your ‘basic’ coffee grinder by adding a custom timer module with programmable presets & an LCD or OLED screen using an Arduino Pro Mini. You don’t need much to build it and it works with other motorised appliances. By Flavio Spedalieri Timer project Page 57 Arduino-based Coffee Grinder Timer Page 64 8– to 40–pin PIC Programming Adaptor Simple Voltage Inverter Doubler Page 90 2 Editorial Viewpoint 5 Mailbag 31 Circuit Notebook Program most newer PIC microcontrollers out-of-circuit with our PIC Programming Adaptor. It works using a PICkit or SNAP programmer and suits 8- to 40-pin micros. You can even use an external adaptors to program SMD chips in SOIC, SSOP or TSSOP packages. By Nicholas Vinen Microcontroller project 42 Online Shop 48 Subscriptions 80 30V 2A Bench Supply, Mk2 – Pt1 73 Serviceman’s Log We’ve updated our 30V 2A Bench Supply to use a more standard and available transformer as the one we used last time cannot be purchased anymore. Otherwise, it’s still a useful and reliable Bench Supply. By John Clarke Power supply project 94 Vintage Radio 99 Ask Silicon Chip 64 PIC Programming Adaptor 90 Voltage Inverter / Doubler Used in our new Bench Supply, this project can produce nearly twice its DC input voltage, or a negative voltage similar in magnitude to the input. It’s a simple design and can operate from 9-15V DC. By John Clarke Power supply project 1. ‘Huygens Beam’ BFO metal detector 2. MPPT Solar Charger update 3. Audio level meter AWA 500M superhet by Ian Batty 103 Market Centre 104 Advertising Index 104 Notes & Errata