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Contents Vol.36, No.12 December 2023 12 The History of Electronics, Pt3 This final part in our series covers the many significant electronic developments that were not the work of individuals, but came from universities, companies and other organisations. By Dr David Maddison Electronic inventors & inventions 24 Arduino Uno R4 Minima The Arduino Uno R4 Minima is the latest version of the well-known Arduino Uno. It marks a major upgrade for the Uno series, because of its 32-bit ARM microcontroller and greatly expanded memory among other additions. By Jim Rowe Microcontroller review 57 Electronic Markets in Shenzhen Shenzhen is home to one of the biggest public electronic marketplaces in the world, full of everything from cameras, drones and individual electronic components such as resistors, capacitors and integrated circuits. By Edison Zhang Electronic components 86 Recreating Sputnik-1, Part 2 Completing a replica of the Sputnik-1 radio transmitter wasn’t easy. Learn how Dr Hugo Holden reverse-engineered and built one of the two D-200 radio transmitters used in the satellite. By Dr Hugo Holden Vintage Radio The History of Electronics Inventors and their Inventions Part 3: page 12 Reviewing the Arduino UNO R4 Minima Page 24 Page 72 Coin Cell Emulator Recreating Sputnik-1 34 Ideal Diode Bridge Rectifiers We have six different Bridge Rectifiers you can build, each acting as a highefficiency drop-in replacement for existing bridge rectifier designs. The ‘Ideal’ Rectifiers can handle currents from 2A up to 40A (continuous). By Phil Prosser Power supply project 42 Secure Remote Switch, Pt1 Our Secure Remote Switch is designed to control low-voltage appliances, such as a garage door controller, fans, pumps or LED lighting. It’s powered from 12V or 24V DC and can be controlled by up to 16 transmitters. By John Clarke Remote control/security project 60 Multi-Channel Volume Control, Pt1 Control the volume of up to 20 audio channels simultaneously using this Volume Control. The Volume Control can be adjusted using its touchscreen, rotary encoder or via an infrared remote control. By Tim Blythman Audio project 72 Coin Cell Emulator This device is used to emulate a coin cell to power a circuit, and at the same time measure the current, voltage and charge plus other statistics. It is a versatile tool when designing or testing low-power circuits. By Tim Blythman Test & measurement project Part 2: Page 86 2 Editorial Viewpoint 5 Mailbag 33 Online Shop 80 Serviceman’s Log 98 Circuit Notebook 101 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata 1. Wireless power transfer demo 2. MIDI Spectral Sound software update 3. Battery-powered timer