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Simple Lie Detector

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lies and truth r make changes our body, its true.. but its not simple thing... its depend on thinking level (deep or light). bcoz this circuit is doesn't give correct result always..
 
A question

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.



Sir What is the use of the transister in this lie detector, although we can simply by aplying votage and using an ohm meter find the resistance of the skin. Then why v use transister in this circuit?
 

Oznog

Active Member
Those Scientologists are gonna try to sue you now, for exposing the plans to their top-secret "E-Meter".
 
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