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
