Contents
Vol.10, No.11; November 1997
FEATURES
4 Understanding Electric Lighting; Pt.1
This new series looks at the different types of lights available & describes
how they work. In Pt.1, we look at the basic units & terms – by Julian Edgar
9 Microsoft’s Power Toys: Tweak Your PC’s Interface
This handy collection of utilities from Microsoft lets you enhance your
Windows 95 interface – by Greg Swain
14 Replacing Foam Speaker Surrounds
You don’t have to throw away those expensive drivers when their foam roll
surrounds perish. Here’s a simple fix to get them going again – by Bill Hendry
Replacing Foam Loudspeaker
Surrounds – Page 14
72 Making Old Ships Go Faster
Novel marine propulsion system for refurbished container ships
PROJECTS TO BUILD
18 Heavy Duty 10A 240VAC Motor Speed Controller
This new speed controller can be used with power tools rated up to 10A &
gives smooth control from zero to full speed – by John Clarke
40 Easy-To-Use Cable & Wiring Tester
Compact device employs four LEDs to speedily indicate the health of a pair
of wires. You can use it to test cables & wiring systems – by Leon Williams
54 A Regulated Supply For Darkroom Lamps
Don’t let variations in the mains supply ruin your prints. This circuit will keep
the enlarger lamp at a constant colour temperature – by Rick Walters
62 Build A Musical Doorbell
It plays a sequence of nine notes each time someone presses your doorbell
button. You program it to play the tune you want – by Bob Flynn
Heavy Duty 10A Motor Speed
Controller – Page 18
Easy-To-Use
Cable &
Wiring Tester
– Page 40
SPECIAL COLUMNS
30 Serviceman’s Log
From soap to Teletext – by the TV Serviceman
66 Radio Control
How does a servo work? – by Bob Young
76 Vintage Radio
The 4-valve Airzone superhet – by John Hill
80 Computer Bits
Relocating your CD-ROM drive – by Jason Cole
DEPARTMENTS
2 Publisher’s Letter
3 Mailbag
38 Circuit Notebook
53 Order Form
89 Ask Silicon Chip
91 Notes & Errata
95 Market Centre
96 Advertising Index
Musical Doorbell – Page 62
November 1997 1
