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Self-Powered Solar Data Logger - My project is a self-powered solar data
logger. Put out in the sunlight, it will measure the light level and log this to
memory to be later downloaded to a computer. The system is powered by a small
solar panel and battery….(added 6/07)
Serial Port A/D Converter - This circuit is a simple 8-bit analogue to digital
converter circuit which is connects to PC serial port. The circuit is based on
TLC548 A/D-converter chip (might be hard to get nowadays, Texas Instruments makes
this IC), which is an A/D-converter with serial output. The output of the TLC548
is not directly suitable for standard serial data reception…. (electronic diagram
added 6/03)
Simple Lie Detector (Aaron Cake) - Here's a simple lie detector that can be
built in a few minutes, but can be incredibly useful when you want to know if
someone is really telling you the truth. It is not as sophisticated as the ones
the professionals use, but it works. It works by measuring skin resistance, which
goes down when you lie. (electronic circuit added 4/05)
Square Root Function Improves Thermostat - 09/30/99 EDN-Design Ideas: Perhaps
the most elementary rule of control-loop design theory is that feedback-loop
performance is fundamentally linked to the careful choice—and stability—of loop
gain. Insufficient loop gain leads to poor setpoint accuracy. Too much gain can
induce feedback instabilities,.....(design idea added 6/06)
