MAY 1988
FEATURES
6 Restoring Vintage Radio Receivers by John Hill
It's time to start collecting
42 Motorola's MC3334P High Energy Ignition IC
CHECK OUT ENGINE RPM
on your model airplane with
this easy-to-build optical
tachometer. You can also use
it to measure the speed of fans
and rotating shafts. See page 18.
by Leo Simpson
New device optimises spark energy
76 The Evolution of Electric Railways by Bryan Maher
Pt.7 - The first electric mainline system
84 Digital Fundamentals, Pt. 7 by Louis Frenzel
Memory circuits
PROJECTS TO BUILD
18 Optical Tachometer for Aeromodellers by John Clarke
Checks engine speeds up to 25,000 RPM
32 Fit High-Energy Ignition to Your Car by Leo Simpson
Improves power, eliminates tune-up hassles
44 Walkaround Throttle for Model Railroads Pt.2
INTERESTED IN RESTORING
vintage radio receivers? If so,
it's time to start collecting.
Turn to page 6 for the first
article in this great new series.
by Leo Simpson
Building the circuit into a console case
62 Ultrasonic Car Burglar Alarm by Branco Justic
A high-performance design that's easy to install
72 Build the Party Light by Stephen David
Uses a commercial 12V strobe light
SPECIAL COLUMNS
12 The Way I See It by Neville Williams
Is UHF TV really as good as it's cracked up to be?
56 Serviceman's Log by the original TV serviceman
Double or quits -
FIT THIS HIGH-ENERGY
ignition system to your car
and forget tune-up hassles. We
explain the benefits and show
you how to build it starting
page 32.
toss ya!
70 Amateur Radio by Garry Cratt
Designing and building attenuators
DEPARTMENTS
2
Publisher's Letter
3 Mailbag
4 News & Views
9 Subscription page
50 Circuit Notebook
83 Back Issues
92 Product Showcase
94 Ask Silicon Chip
96 Market Centre
ULTRASONIC ALARMS have
one big advantage - they're
easy to install. This unit can
be used in car or house
installations and has special
circuitry to stop false
triggering. Details page 62.
M A Y 1988
1