Vol.9, No.5; May 1996
Contents
FEATURES
6 Cathode Ray Oscilloscopes, Pt.3
Continuing our series on these important instruments. This month, we see how
oscilloscopes work at very high frequencies – by Bryan Maher
22 Upgrade Your PC In Ten Minutes
We show you how you can upgrade an old 386, or even a 286, to a 486; or a
486 to full 586 performance with just one upgrade chip – by Ross Tester
PC UPGRADES CAN BE
QUICK AND EASY WITH THIS
CHIP – PAGE 22
PROJECTS TO BUILD
14 Duplex Intercom Using Fibre-Optic Cable
Most intercoms are simplex but this one is a full duplex intercom (ie, two ways at a
time) and uses the very latest fibre optic cable – by Leo Simpson
30 High Voltage Insulation Tester
This high voltage insulation tester can measure resistance from 1000MΩ
to 2200GΩ, with a 10-step LED bargraph readout – by John Clarke
DUPLEX INTERCOM USES
LATEST FIBRE OPTICS – PAGE 14
57 Motorised Laser Lightshow For Spectacular Effects
You’ve seen those fancy lightshows at discos and rock concerts. Now you can have
your own – by Leo Simpson
80 KnightRider: A Bi-Directional LED Chaser Just Like Kit's!
Everyone wanted a two-way chaser just like ‘Kit’ had across its bonnet. Now you
can build the LED version or even build the real thing – by Rick Walters
SPECIAL COLUMNS
40 Serviceman’s Log
It was a dark and stormy night – by the TV Serviceman
53 Radio Control
Multi-channel radio control transmitter; Pt.4 – by Bob Young
HIGH VOLTAGE
INSULATION
TESTER – PAGE 30
74 Computer Bits
Create your own Home Page on the World Wide Web – by Geoff Cohen
88 Vintage Radio
A look at early radiograms, even back to Edison's day – by John Hill
DEPARTMENTS
2 Publisher’s Letter
4 Mailbag
29 Order Form
38 Circuit Notebook
70 Product Showcase
78 Bookshelf
92 Ask Silicon Chip
95 Market Centre
96 Advertising Index
LED CHASER HAS 2-WAY CHASE
PATTERN – PAGE 80
May 1996 1