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Contents Vol.35, No.10 October 2022 16 Display Technologies, Part 2 We finish covering the latest developments in video display technology by detailing liquid-crystal displays (LCDs) and more recent advances such as quantum-dot displays, OLEDs, electroluminescents and more. By Dr David Maddison Tech feature 44 New PICs & AVRs from Microchip Microchip have released many new microcontrollers this year, including PICs as well as AVRs (previously from Atmel). We look at the features of five promising new parts and the broader families that they come from. By Tim Blythman Product review 54 Buck/Boost Battery Charging The Buck/Boost LED Driver is a versatile module. In this article we show you how to use it for charging (12 or 24V DC) and convert between different DC voltages (12 ↔ 24V) using its standard features. By Tim Blythman Battery charging 28 30V 2A Bench Supply, Part 1 Our new Bench Supply is fully adjustable with ranges of 0-30V DC and 0-2A. It features voltage and current metering, load switching, over-temperature and short circuit protection. All in an easy-to-build package. By John Clarke Bench supply project 50 PIC & AVR Breakout Boards These three Breakout Boards can be plugged directly into a breadboard and then connect to a Snap or PICkit 4 programmer. Two are designed for PIC16F18xxx-series of micros while the other is for the AVR64DD32. By Tim Blythman Microcontroller project 60 Multi-Stage Buck/Boost Charger This simple add-on turns our Buck/Boost LED Driver into a multi-stage battery charger. It works with different battery chemistries, and includes absorption, float and storage charging, temperature compensation & more! By Tim Blythman Battery charger project 70 Automatic Train Controller This project brings together multiple designs to provide level crossing and semaphore control, all to automate a model railway layout. You can even add chuff and whistle sounds to make it more realistic! By Les Kerr Model railway project 86 WiFi Programmable DC Load, Pt2 To finish our new WiFi DC Load, we cover all the assembly details and how you go about testing (with a detailed manual available separately) and then using the finished project. By Richard Palmer Test equipment project Page 28 0-30V 0-2A bench supply Page 50 PIC & AVR Breakout Boards Auto Train Page 70 Controller 2 Editorial Viewpoint 4 Mailbag 41 Circuit Notebook 52 Subscriptions 78 Serviceman’s Log 85 Mouser Q&A 98 Online Shop 1. ST7920 LCD driver for PIC32MZs 2. EEPROM programmer for FX Pedal 3. Galvanic skin response unit 100 Vintage Radio 106 Ask Silicon Chip 111 Market Centre 112 Advertising Index 112 Notes & Errata STC model 510 portable by Associate Professor Graham Parslow