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Contents Vol.36, No.02 February 2023 14 Computer Memory, Part 2 Increasingly smaller, faster and larger-capacity memory has been one of the major drivers for technological advances in computers. The last part in the series primarily covers SRAM, DRAM and proposed new technologies. By Dr David Maddison Technology feature 24 Computer Memory Addendum We have compiled some interesting facts about the latest in memory technology that couldn’t make it in to the main series. That includes how images, video and audio are stored on computers and not just text. By Nicholas Vinen Technology feature 52 A 30mm Spark-Gap Tesla Coil Building a full-size Tesla Coil isn’t for the faint of heart, although it can be done if you are careful and know the tricks. Here’s how Flavio Spedalieri built a small-scale Tesla Coil that produces spectacular discharges. By Flavio Spedalieri Educational feature Active Mains Soft Starter Page 33 ADVANCED TEST T EEZERS PAGE 44 The making of a 30mm desktop Spark-Gap Tesla Coil 72 Heart Rate Sensor Module The AD8238-based heart rate monitor module is a low-cost way to monitor the operation of the heart via an Arduino or similar, like an electrocardiogram. It comes with a 3-electrode lead and is available from Jaycar. By Jim Rowe Using electronic modules 33 Active Mains Soft Starter, Part 1 Appliances with high startup current can damage your work, trip your circuit breaker and more. This Soft Starter prevents the high current surge that occurs when the device is first turned on, reducing the ‘kick’ you get. By John Clarke Mains control project 44 Advanced Test Tweezers, Part 1 The Advanced SMD Test Tweezers have numerous features and improvements such as a larger screen and better user-interface. But don’t let the name fool you, as it is not limited to just testing SMD components. By Tim Blythman Test equipment project Page 52 2 Editorial Viewpoint 5 Mailbag 42 Subscriptions 60 Online Shop 70 Product Showcase 86 Serviceman’s Log 96 Circuit Notebook 62 Active Subwoofer, Part 2 In this final article, we show you how to build and install the 180W amplifier, complete the wiring, install the driver and add feet. The completed highfidelity Subwoofer suits just about any hifi system. By Phil Prosser HiFi project 76 Noughts & Crosses, Part 2 We explain how this machine plays noughts & crosses using a game tree, and show you how to build it, including the PCBs and custom case. By Dr Hugo Holden Game project 1. Light with automatic switch-off 2. Automatic mouse clicker 3. Discrete logic frequency comparator 4. Skylight controller 100 Vintage Radio 106 Ask Silicon Chip 111 Market Centre 112 Advertising Index 112 Notes & Errata VE301Wn Dyn Volksemfänger by Ian Batty