AUGUST 1988
FEATURES
FANCY A PLASMA DISPLAY
just like the one shown on the
front cover? This easy-to-build
EHT supply goes with a
commerdal plasma bottle to
give you a fascinating project.
Details page B.
54 A Look at Insulated Tab Trlacs by Leo Simpson
A safer way of switching mains voltages
63 Digital Fundamentals, Pt.9 by Louis Frenzel
Input/output operations
76 The Evolution of Electric Railways by Bryon Moher
Pt.10: Electrification in Central Europe
PROJECTS TO BUILD
8 Bulld a Plasma Display by Leo Simpson
Lightning bolts in a bottle
18 High Performance AC Millivoltmeter by Bob Flynn
Measures signals down into the microvolt region
38 Universal Power Supply Board by Leo Simpson
Use it with op amp circuits
42 Building the Discollght, Pt.2 by Greg Swain
Construction plus troubleshooting
56 Remote Controlled Chimes Unit by John Clarke
Use it as a patient sick call or wireless doorbell
SPECIAL COLUMNS
IF YOU'RE CROOK in bed with
a bad back, there's no need to
shout for a cup of tea. Just press
the button on our new remote
controlled chimes unit to gain
attention. It also makes a beaut
wireless doorbell. See page 56.
-'
4 Vintage Radio by John Hill
Capacitors cause lots of problems
14 The Way I See It by Neville Williams
Some things are enough to make a grown man cry
28 Serviceman's Log by the original TV serviceman
Sound reasons for confusion
84 Amateur Radio by Garry Crott
How to get the most out of nicad batteries
DEPARTMENTS
2 Publisher's Letter
34 Circuit Notebook
49 Back Issues
89 Subscriptions
91
94
95
96
Product Showcase
Ask SIiicon Chip
Notes & Errata
Market Centre
THIS HIGH-PERFORMANCE
AC millivoltmeter is the latest
in the SIUCON CIJIP line-up of
test equipment. ·It con
measure audio signals down
into the microvolt region.
Construction starts on page 18.
NEGATIVE FEEDBACK
SERIES: due to severe demands
on space in this issue, we have
had to hold the Negative
Feedback article over until next
month.
AUGUST 1988
1