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ISSN 0262 3617
 PROJECTS  THEORY 
 NEWS  COMMENT 
 POPULAR FEATURES 
VOL. 37. No.8
INCORPORATING ELECTRONICS TODAY INTERNATIONAL
www.epemag.co.uk
EPE Online: www.epemag.com
August 2008
Projects and Circuits
FOUR-CHANNEL A/V SELECTOR by Jim Rowe
Select one of four S-video or composite video sources plus audio
10
DC RELAY SWITCH by John Clarke
Control high current loads with a few milliamps
22
TEMPERATURE SWITCH by John Clarke and Julian Edgar
A cheap general-purpose design that can work up to 245°C
30
MAINS MONITOR by John Becker
Keep track of electricity use in your home
35
INGENUITY UNLIMITED Sharing your ideas with others
Universal Ding-Dong; 10V to 12V LED Voltmeter
52
Series and Features
TECHNO TALK by Mark Nelson
Up close and personal – PANs and NFC
20
INTERFACE by Robert Penfold
Assessing serial ports
28
TEACH-IN 2008 – USING PIC MICROCONTROLLERS – PART 10
by John Becker
Examining a program’s construction, a game of Dominoes, plus
LCD symbol creation
46
CIRCUIT SURGERY by Ian Bell
Transistor saturation
54
PIC N’ MIX by Mike Hibbett
More on I/O port expansion
57
NET WORK by Alan Winstanley
Putting on a MAC; Linux – almost child’s play
66
Regulars and Services
© Wimborne Publishing Ltd 2008. Copyright in all
drawings, photographs and articles published in
EVERYDAY PRACTICAL ELECTRONICS is fully
protected, and reproduction or imitations in whole or
in part are expressly forbidden.
Our September 2008 issue will be published on
Thursday 14 August 2008, see page 72 for details.
Everyday Practical Electronics, August 2008
EDITORIAL
7
NEWS – Barry Fox highlights technology’s leading edge
Plus everyday news from the world of electronics
8
PIC RESOURCES CD-ROM
EPE PIC Tutorial V2, plus PIC Toolkit Mk3 and a selection of PIC-related articles
18
ELECTRONICS MANUALS
The Modern Electronics Manual and Electronics Service Manual on CD-ROM
21
BACK ISSUES Did you miss these?
26
PIC PROJECTS A plethora of PIC projects on CD-ROM
44
CD-ROMS FOR ELECTRONICS
A wide range of CD-ROMs for hobbyists, students and engineers
60
SUBSCRIBE TO EPE and save money
63
READOUT John Becker addresses general points arising
64
DIRECT BOOK SERVICE
A wide range of technical books available by mail order, plus more CD-ROMs
67
EPE PCB SERVICE
PCBs for EPE projects
70
ADVERTISERS INDEX
72
Readers’ Services • Editorial and Advertisement Departments
7
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