Schematic DIY KitPolygraph Trust no one!
Simple lie detectors measure the skin resistance of a respondent. This device during a survey of a sweat, this may be indicated by a corresponding circuit. Here links to matching circuits

Here you will find Schematic Circuit Diagram for DIY and further information on Polygraph
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Extremely easy to set up circuit, ideal for beginners www.wagener-net.de/seite306.htm

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