Vol.5, No.9. September 1992
FEATURES
THIS NEW SPEED controller can
be used with power tools rated
up to 5 amps. You can use it to
control the speed of circular
saws, electric drills, lawn edgers
& other appliances. See page 28.
16 A Tutorial On PC-Based Data Acquisition by David Potter
Transducers, signal conditioning & software
89 The Story Of Electrical Energy, Pt.20 by Bryan Maher
Sydney's tramways & the Ultimo power station
PROJECTS TO BUILD
6 Track Tester For Model Railroads by Leo Simpson & John Clarke
Locate trouble spots quickly with this ingenious tester
28 Heavy-Duty SA Drill Speed Controller by Leo Simpson
Use it with circular saws, drills & lawn edgers
46 The lnterphone Digital Telephone Exchange, Pt.2 by Jeff Monegal
Assembly details & installation procedure
56 A Multi-Sector Home Burglar Alarm by Mike Zenere
Easy to build circuit has digital keypads & microprocessor control
LOOKING FOR AN UP-TO-DATE
home burglar alarm that's big on
features but low in price? This
unit comes with optional remote
keypads & has microprocessor
control. Turn to page 56.
78 A General-Purpose 3½-Digit Panel Meter by Darren Yates
Has switchable decimal points & can read voltage or current
SPECIAL COLUMNS
37 Computer Bits by Mike Zenere
A look at the 68705 microcontroller
40 Vintage Radio by John Hill
Repairing an old Heathkit RF generator
64 Serviceman's Log by the TV Serviceman
Death rattles: a thorny problem
WHAT WOULD cause death
rattles from an English Thorn TV
set? The Serviceman solved the
mystery. Details page 64.
86 Amateur Radio by Garry Cratt
Build this relative field strength meter
93 Remote Control by Bob Young
Internal combustion motors for R/C models, Pt.2
DEPARTMENTS
2 Publisher's Letter
4 Mailbag
8 Circuit Notebook
73 Product Showcase
96 Back Issues
98 Ask Silicon Chip
100 Notes and Errata
101 Order Form
102 Market Centre
104 Advertising Index
BUILD THIS 3½-DIGIT LCD panel
meter into your next power
supply project. It features
switchable decimal points & can
read voltages up to 200V or
currents up to 2A. See page 78
SEPTEMBER1992
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