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Contents
Vol.29, No.1; January 2016
SILICON
CHIP
www.siliconchip.com.au
Features
12 Blood Pulse Oximeters: How They Work
Ever visited someone in hospital and noticed a small sensor clipped over one of
their fingers? That’s the business end of a blood pulse oximeter, used to monitor
the oxygen level in a patient’s blood. Here’s a quick run-down on exactly what
they do and how they work – by Jim Rowe
76 Versatile Technology: An Aussie Innovator
Who said the Australian electronics industry was dead? One innovative
company, Versatile Technology (Melbourne), has become a world leader in
making equipment for testing metal soft-drink/beer cans and other containers
such as PET plastic bottles – by Ross Tester
Raspberry Pi Temperature, Humidity
& Pressure Monitor – Page 18
88 Handy Reactance Wallchart
This handy wallchart lets you easily check the -3dB rolloff point of a simple RC
or RL network or find the resonant frequency of an LC network
Pro jects To Build
18 Raspberry Pi Temperature/Humidity/Pressure Monitor Pt.1
Want to monitor temperature, humidity and pressure using a web browser
from a remote location? Here’s how to do it using a Raspberry Pi 2 Model B
computer, a Sense HAT module and a Wi-Pi WiFi dongle – by Greg Swain
Valve Stereo Preamplifier For
HiFi Systems – Page 28.
28 Valve Stereo Preamplifier For HiFi Systems
This stand-alone stereo valve preamplifier offers good performance, with low
distortion and a very high signal-to-noise ratio of -105dB. It’s easy to build too,
with the preamp and power supply all on one PCB – by Nicholas Vinen
36 High Visibility 6-Digit LED GPS Clock, Pt.2
Our new GPS high-visibility 6-digit LED clock automatically changes time zones
as you travel around the country or even between countries. This second article
has all the information you need to complete and use it – by Nicholas Vinen
54 Reduce Rear-End Collision Risk With The QuickBrake
High-Visibility 6-Digit
LED GPS Clock, Pt.2 – Page 36.
Reduce the risk of rear-end collisions by automatically switching on the brake
lights each time you rapidly lift off the accelerator – by John Clarke
Special Columns
62 Circuit Notebook
(1) USB Power Injector; (2) Bi-Directional 8-Bit Digital Interface; (3) Audio
Generator Has Triangle & Square Waveforms
66 Serviceman’s Log
Tools, old scopes & my hoarding habit – by Dave Thompson
82 Vintage Radio
Sony’s TR-63 shirt-pocket transistor radio – by Ian Batty
Departments
2
4
53
86
Publisher’s Letter
Mailbag
Product Showcase
SC Online Shop
siliconchip.com.au
91
95
96
96
Ask Silicon Chip
Market Centre
Advertising Index
Notes & Errata
Reduce Rear-End Collision Risk
With The QuickBrake – Page 54.
January 2016 1
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