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Contents
Vol.16, No.11; November 2003
www.siliconchip.com.au
FEATURES
8 Electronic Noses Smell A Big Future
Don’t sniff – electronic noses have a big future, from checking your morning
coffee to sniffing out explosives. And they’re here now – by Peter Holtham
14 Logging Your Every Driving Moment
Some airbag controllers do more than just trigger the airbags; they also log
your speed and a range of other driving actions – by Julian Edgar
85 PC Board Design Tutorial, Pt.2
The basics of component placement and routing, plus a few tips to make your
boards look good – by David L. Jones
A 12AX7 Valve Audio Preamplifier –
Page 24.
PROJECTS TO BUILD
24 A 12AX7 Valve Audio Preamplifier
And we swore we’d never do another valve audio project. Who was it that said
“bottles” were dead? – by Jim Rowe
41 Our Best LED Torch . . . Ever!
It’s based on a Luxeon Star/O 1W ultrabright LED, runs off two “D” cells and
blasts our previous LED torches into the weeds! – by John Clarke
62 Smart Radio Modem For Microcontrollers
This low-cost project will enable your Picaxe, Stamp or other microcontroller
to communicate without wires – by Nenad Stojadinovic
74 The PICAXE, Pt.8: The 18X Series
Our Best LED Torch . . .
Ever – Page 41.
You’ve guessed it: the Picaxe 08 chip has several big brothers. Here’s a look
at the “18A” version, along with a simple temperature sensor – by Stan Swan
78 A Programmable PIC-Powered Timer
This PIC-based timer can be set for any period from one second up to 680
days and even (theoretically) up to nearly 60 years – by Trent Jackson
SPECIAL COLUMNS
36 Serviceman’s Log
The JVC TV set that whistled – by the TV Serviceman
71 Circuit Notebook
Smart Radio Modem
For Microcontrollers – Page 62.
(1) Making The Flexitimer Cycle On And Off; (2) Low Battery Indicator; (3) A
Simple 9-Way Cable Identifier; (4) Clipping Indicator For Audio Amplifiers;
(5) 8V DV Supply With Overvoltage Protection; (6) Cheap Switchmode DC-DC
Converter
90 Vintage Radio
The 1953 4-Valve Precedent Mantel Receiver – by Rodney Champness
DEPARTMENTS
2
4
13
59
Publisher’s Letter
Mailbag
Order Form
Product Showcase
www.siliconchip.com.au
61
96
98
99
Silicon Chip Weblink
Ask Silicon Chip
Notes & Errata
Market Centre/Ad Index
Programmable PIC-Powered Timer –
Page 78.
November 2003 1
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