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Contents
Vol.18, No.8; August 2005
www.siliconchip.com.au
FEATURES
8 60 Years Of The Atomic Bomb
It’s 60 years since the first atomic bombs were used in warfare. Here’s a
look at the two designs used and their deadly effect – by Keith Walters
22 Direct Petrol Injection
Complex electronics control and direct fuel injection into the combustion
chambers can provide big fuel savings. Here’s how it works – by Julian Edgar
102 Hellschreiber Revisited
Feedback from readers suggests that it’s not as it appears at first glance
PROJECTS TO BUILD
Mudlark A205 Valve
Stereo Amplifier – Page 30.
30 The Mudlark A205 Valve Stereo Amplifier
Want to build a valve stereo amplifier for your hifi system? This class-A2 triode
unit produces 20W/channel and has good performance – by David Whitby
38 Programmable Flexitimer
It’s easy to build, easy to program and can be set to give two sequential time
periods of up to 99 minutes and 59 seconds. What’s more, you can program it
for up to 99 cycles of the time periods – by Jim Rowe
61 Carbon Monoxide Alert
Carbon monoxide can kill. This sensitive unit not only detects this deadly gas
but can automatically control the air vents in your car as well – by John Clarke
74 Serial LCD Driver
Programmable
Flexitimer – Page 38.
Want to use an LCD with your next PC or PICAXE project? Here’s an LCD
driver that’s really cheap and easy to connect – by Graeme Matthewson
82 Enhanced Sports Scoreboard
This upgraded version of the Professional Sports Scoreboard now includes
2-digit fouls displays for the home and away teams – by Jim Rowe
SPECIAL COLUMNS
48 Serviceman’s Log
Tracking down a really rotten fault – by the TV Serviceman
70 Circuit Notebook
(1) Vertical Sync For The Component Video To RGB Converter; (2) LED
Noughts & Crosses; (3) Audio Level Threshold Control; (4) Cheap Pump
Controller; (5) DC-DC Converter For USB Supply Or PICAXE Projects
Carbon Monoxide
Alert – Page 61.
90 Salvage It!
Washing machine pressure switches – by Julian Edgar
94 Vintage Radio
The AWA Radiola B32 transistor portable – by Rodney Champness
DEPARTMENTS
2
4
99
104
Publisher’s Letter
Mailbag
Product Showcase
Ask Silicon Chip
siliconchip.com.au
107
108
109
111
Notes & Errata
Order Form
Market Centre
Ad Index
Serial LCD
Driver – Page 74.
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