MARCH 1989
FEATURES
HERE'S A MOVING MESSAGE
display board that you can build
yourself. It can be controlled
from a personal computer or
directly from an IBM PCcompatible keyboard. Details
page 34.
4 Electronics For Everyone by Leo Simpson
Ptl: what you need to know about resistors
42 The NE572 Compandor Chip by Malcolm Young
Abridged data & specifications
84 The Technology Letters by Richard Kopf
Fun & games in the security industry
88 The Evolution of Electric Railways by Bryan Maher
Pt.17: NSW XPT express passenger trains
PROJECTS TO BUILD
WANT TO RECORD compact
discs for use in your car's tape
player? You'll need this CD
Compressor to record the music
without distortion. See page 26.
26 Stereo Compressor For CD Players by Greg Swain
Lets you tape compact discs without distortion
34 Build a LED Message Board by Don McKenzie
Works from an IBM-compatible keyboard or computer
44 Studio Series 32-Band Equaliser by John Clarke
Uses special slider pots for improved boost & cut action
64 Map Reader For Trip Calculations by M. Young
Simple circuit uses a LED & phototransistor
SPECIAL COLUMNS
16 Vintage Radio by John Hill
Timber cabinets are a lot of work
56 Serviceman's Log by the original TV serviceman
The line of most resistance
68 Amateur Radio by Garry Cratt
Build a simple VHF FM monitor receiver, Pt.2
74 The Way I See It by Neville Williams
"Spycatcher": do Wright's electronics bear scrutiny?
OUR TV SERVICEMAN
suffered a few jibes this month
and struck problems with
substitute transistors. His story
starts on page 56.
DEPARTMENTS
2 Publisher's Letter
3
32
41
51
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IBC Back Issues
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93
95
96
THIS SIMPLE VHF FM monitor
receiver use just two ICs and a
handful of other parts. We show
you how to build it for the
2-metre amateur band. See
page 68.
MARCH 1989
1