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Contents Vol.36, No.01 January 2023 12 Computer Memory, Part 1 Increasingly smaller, faster and larger-capacity memory has been one of the major drivers of technological advances in computers. This two-part series covers how ephemeral data is stored and what it is stored in. By Dr David Maddison Computer technology 27 2W RF Amplifier & Wattmeter Two watts might seem like too little for an amplifier, but you might be surprised how useful this tiny device is. It’s designed and rated for VHF applications between 1-930MHz. By Allan-Linton Smith RF product review 40 How to build a Mini-ITX PC Portable computers, like laptops, are invaluable if you need to work in multiple locations. But they lack the power of a desktop machine which is why Mini-ITX is the perfect form factor for a smaller DIY computer. By Nicholas Vinen Building computers 68 Magnetic Amplification We show you how a semi-regulated voltage can be controlled by using just two separate transformers, a potentiometer and two diodes. By Fred Lever Voltage regulation feature 30 Q Meter In conjuction with an RF signal generator, this compact meter measures the quality factor (Q factor) of inductors, up to values of about 200. It is invaluable for RF filter design and component selection. By Charles Kosina Test & measurement project 50 Raspberry Pi Pico W BackPack Our upgraded Pico W BackPack now features WiFi functionality along with its 3.5-inch touchscreen. We’ve also included sample code to show how you can use HTTP, UDP and NTP with the BackPack. By Tim Blythman WiFi microcontroller project 58 Active Subwoofer, Part 1 The Active Subwoofer is a ‘no-compromise’ design. While it is designed for use with the Active Monitor Speakers from Nov-Dec 2022, it can be used in many other applications such as a high-quality home theatre system. By Phil Prosser HiFi project 80 Noughts & Crosses Machine, Pt1 This Noughts & Crosses-playing (Tic-Tac-Toe) computer uses only logic gates to play Noughts & crosses with you! It has its own case with lighting underneath the pieces, and you can even play it with a friend. By Dr Hugo Holden Game project Cover image: close-up of stacked RAM modules Page 30 Q Meter Page 40 Build your own mini-ITX PC Page 58 12-inch Driver High-Performance ACTIVE SUBWOOFER 2 Editorial Viewpoint 5 Mailbag 67 Subscriptions 76 Circuit Notebook 90 Vintage Radio 95 Product Showcase 96 Serviceman’s Log 105 Ask Silicon Chip 108 Online Shop 111 Market Centre 112 Advertising Index 112 Notes & Errata 1. Noughts & Crosses with two modules 2. MIDI Toolbox UDISCO L6 circa 1927 by Dennis Jackson