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Different Sensors, Monitors and Measurement Schematics

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Glitch detector

Glitch detector

http://circuitos.tripod.cl/schem/r46.gif

Peak Detector

Peak Detector

http://www.web-ee.com/Schematics/Peak%20Detector/PeakDetector.htm

Perimeter Monitor

Perimeter Monitor

Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom of a garden or garage, and used to detect all sound in that area. The cable can be buried in a hosepipe or duct and is concea

http://www.zen22142.zen.co.uk/Circuits/Misc/perim.htm

Bug Detector with Beep

Bug Detector with Beep

http://www.uoguelph.ca/~antoon/circ/bugbeep.htm

ELF Monitor

ELF Monitor

http://circuitos.tripod.cl/schem/r97.gif