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Contents
Vol.35, No.4
April 2022
14 Geiger Counters and Radiation
14
Radioactivity is everywhere! But since you can’t see it, how do you tell
how much, if any, is present? This article investigates ways to measure
radioactivity electronically plus some of the basics of radioactivity.
By Dr David Maddison
Science
38 The History of Transistors, Pt2
Transistor technology progressed rapidly in the ~20 years between the
first commercial transistor being produced and the development of
manufacturing techniques that are still in use today.
By Ian Batty
Semiconductors
50
80 New 8-bit PICs from Microchip
When updating our SMD Test Tweezers we found out the micro used in it
wasn’t in stock, so we had to pivot to using the newer PIC16F15214. So
what does it offer over the previous 8-bit micro we were using?
By Tim Blythman
Microcontrollers
82 Dick Smith Contest Results
We received some great submissions for the Noughts & Crosses
competition. This article summarises the entries of the five winners (with
one special prize awarded) and four runners-up.
By Nicholas Vinen
Competition
27 500W Power Amplifier, Part 1
Big, clear sound with low noise and distortion are just some of the aspects
of our gigantic Amplifier module. It can deliver 500W RMS into a 4W load, or
270W into 8W. Two of them can also be bridged together to deliver 1000W!
By John Clarke
Audio project
50 Railway Semaphore Signal
This realistic-looking OO gauge semaphore is modelled on a real British
semaphore. It has a ‘flag’ that is driven by a servo and a bicolour LED to
indicate to a train whether to pass or stop.
By Les Kerr
Model railway project
72 Update: SMD Test Tweezers
The Improved SMD Test Tweezers are an in-place upgrade. All you need to
do is slot in the new PIC to enable a swathe of extra features. The display
can also be rotated 180° to help those who are left-handed.
By Tim Blythman
Test equipment project
100 Capacitor Discharge Welder, Pt2
After following the steps in this article you will have built your own
Capacitor Discharge Welder, which forms a neat package. It is
customisable and we also provide some tips on using it.
By Phil Prosser
Tool project
in Sydney on the 5-6th
65 Back
of April at Rosehill Gardens,
ElectroneX returns with a plethora of
companies and workshops to visit.
2
Editorial Viewpoint
4
Mailbag
37
Subscriptions
89
Circuit Notebook
92
Serviceman’s Log
98
Online Shop
1. Very simple adjustable electronic load
2. Three games that test reaction times
3. NBN battery backup
110
Vintage Radio
116
Ask Silicon Chip
Monopole D225 radio by Graham Parslow
119
Market Centre
120
Advertising Index
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