Everyday Practical Electronics №8 2013г

Projects and Circuits
10 DRIVEWAY SENTRY
     by Jim Rowe
     Detect vehicles moving along your driveway using the

     earth's magnetic field
26 MILLIOHM METER ADAPTOR FOR DMMS
     by Jim Rowe
     Measure very low resistances accurately, without an

     expensive benchtop meter
40 BUILD A VOX
     by John Clarke
     Use this VOX circuit anywhere you want to switch

     something with sound
46 SUPERB FOUR-CHANNEL AMPLIFIER - ON THE CHEAP!
     by Julian Edgar
     High-quality amplifier using a mix of salvaged parts and

     prebuilt modules
Series and Features
24 TECHNO TALK by Mark Nelson
     Scare stories
36 COMPUTER ERROR: RELIABLE DIGITAL PROCESSING

     PART 1 by William Marshall
     The early days of computer reliability - valves and avoiding

     faults
52 MAX'S COOL BEANS by Max The Magnificent
     Particles and cosmic rays... Particles, or waves, or

     particles?
54 INTERFACE by Robert Penfold
     Try some Raspberry Pi
57 CIRCUIT SURGERY by Ian Bell
     Dataslicing and Manchester coding
66 NET WORK by Alan Winstanley
     Don't track me!... Ghostery hunters... Fully compatible...

     Plus ca change...
Regulars and Services