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Issue 189
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<< Issue 188 | Issue 190 >>
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An RFID Security Module
15 Jun, 2004
No more codes and no more keys; just wave a key tag to open doors and control security systems.
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Fridge-Door Open Alarm
16 Jun, 2004
It beeps if the fridge door is left open for too long or hasn't closed properly, to stop food from spoiling. There are lots of other uses as well.
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Automating PC Power-Up
17 Jun, 2004
Tired of pressing the power switch to boot your PC after mains power has been applied? This simple modification does the job for you.
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Courtesy Light Delay For Cars
21 Jun, 2004
Simple circuit has an adjustable delay from 7-40s and fades the lights out at the end of the delay period. And the same circuit suits all cars.
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Ask Silicon Chip - 30 Jun, 2004
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