Everyday Practical Electronics Magazine 38-04 - Apr 2009.pdf

VOL. 38. No 4 April 2009
SUPER ACCURATE GPS-BASED
FREQUENCY REFERENCE
Uses the GPS ‘atomic clocks’
to generate accurate 10MHz
and 1MHz signals
VERSATILE
4-INPUT MIXER
With tone controls and a
built-in headphone amp
OSCAR
NOUGHTS & CROSSES
MACHINE
Plus RECYCLE IT !
A highly sensitive vibration sensor
for next to nothing
ISSN 0262 3617
 PROJECTS  THEORY 
 NEWS  COMMENT 
 POPULAR FEATURES  INCORPORATING ELECTRONICS TODAY INTERNATIONAL
VOL. 38. No 4 April 2009
Projects and Circuits
GPS-BASED FREQUENCY REFERENCE by Jim Rowe 10
Super-accurate 10MHz and 1MHz signals for calibration purposes
OSCAR NOUGHTS & CROSSES MACHINE by Brian Healy 22
Modern reincarnation of a 1960s electronic game
VERSATILE 4-INPUT MIXER by Jim Rowe 28
Low cost, low noise for a wide range of signal sources
INGENUITY UNLIMITED Sharing your ideas with others 46
Wind-Water Speed Indicator; Alternators As Servos
BREADBOARDING PROJECTS by Dr Malcolm Plant 48
Part 7 – Ultrasonic Remote Control – Transmitter and Receiver
Series and Features
TECHNO TALK by Mark Nelson 20
Light In The Gloom
RECYCLE IT by Julian Edgar 42
A vibration sensor for a few pounds
INTERFACE by Robert Penfold 44
Using handshake outputs as power sources
CIRCUIT SURGERY by Ian Bell 54
Selecting op amps
PIC N’ MIX by Mike Hibbett 60
Video from a PIC
NET WORK by Alan Winstanley 66
When broadband goes off the rails
Regulars and Services
EDITORIAL 7
NEWS – Barry Fox highlights technology’s leading edge 8
Plus everyday news from the world of electronics
SUBSCRIBE TO EPE and save money 21
PIC PROJECTS CD-ROM 52
A plethora of handPICed projects
PIC RESOURCES CD-ROM 53
EPE PIC Tutorial V2, plus PIC Toolkit Mk3 and a selection of PIC-related articles
BACK ISSUES Did you miss these? 58
CD-ROMS FOR ELECTRONICS 62
A wide range of CD-ROMs for hobbyists, students and engineers
READOUT Matt Pulzer addresses general points arising 65
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