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Contents Vol.37, No.04 April 2024 22 Becoming a Radio Amateur Being an amateur radio operator (also known as a “ham”) can be a rewarding hobby, and is perfect for those who are already interested in electronics. I recently earned my licence; here’s what you need to know. By Dr David Maddison, VK3DSM Amateur radio Becoming an Amateur Radio Operator 58 ROCK Model 4C+ SBC review The Radxa ROCK Model 4C+ is compatible with much of the Raspberry Pi ecosystem and is in the same form factor as the Raspberry Pi Model 4B, but it has some unique features that differentiate it from the Pi. By Tim Blythman Single board computer review 90 Fender Bassman Guitar Amp The Fender “Tweed” Bassman is one of the most famous guitar amplifiers. We take a look at the model 5F6-A from 1958, which is notable for the same circuit being used in the later Marshall JTM45. By Brandon Speedie Vintage electronics 36 Pico Gamer Page 22 Pico Gamer Page 36 Page 72 The Pico Gamer is a PicoMite-powered retro game console that includes nine games, with three of them inspired by Pac-Man, Space Invaders and Tetris (with more that can be added). It uses a rechargeable battery with a runtime of approximately eight hours and sports a 3.2in colour LCD screen. By Geoff Graham Video game console project ESP32-CAM LCD BackPack 49 Pico Digital Video Terminal, Pt2 This project adds the ability to communicate with and control a Micromite, PicoMite, WebMite or similar using a USB keyboard and HDMI display. See this article for how to build it and get it running. By Tim Blythman Computer interface project 62 Skill Tester 9000, Pt1 The Skill Tester 9000 is a reimagination of an old dexterity tester game, with added lights, timers, countdowns, sounds and competition! Construction is made easy as the PCB can be built in stages. By Phil Prosser Game project 72 ESP32-CAM LCD BackPack The ESP32-CAM is a WiFi camera module we previously reviewed and have now incorporated into a BackPack design. It includes a powerful processor, so you can use it as the basis for a remote monitoring project or similar. By Tim Blythman Microcontroller project 79 Reference MEMS Microphones Rather than electret microphones, here is how you can use microelectromechanical system (MEMS) microphones as a calibrated measurement mic with a good frequency response. By Phil Prosser Audio project 2 Editorial Viewpoint 5 Mailbag 16 Circuit Notebook 78 Product Showcase 82 Serviceman’s Log 96 Online Shop 98 Subscriptions 99 Ask Silicon Chip 103 Market Centre 104 Advertising Index 104 Notes & Errata 1. Humidicrib temperature controller 2. LoRa mesh networking