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Simple lie detector 2011-09-10

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ElectroMaster

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ElectroMaster submitted a new article:

Simple Lie Detector - Here's a simple lie detector that can be built in a few minutes, it is mean for fun and is obviousl

Here's a simple lie detector that can be built in a few minutes, it is mean for fun and is obviously not very accurate. It works by measuring skin resistance, which goes down when you lie.

Schematic

View attachment 56753

Parts

R1 - 33K 1/4W Resistor
R2 - 5K Pot
R3 - 1.5K 1/4W Resistor
C1 - 1uF 16V Electrolytic Capacitor
Q1 - 2N3565 NPN Transistor
M1 - 0-1 mA Analog Meter
MISC - Case, Wire, Electrodes (See Nots)

Notes

1. The electrodes can be...
Read more about this article...
 

karakris

New Member
What causes this resistance to lower: When somebody tells a lie, they're supposed to have a emotional reaction which induces sweating. Skin moisture increases, lowering its electrical resistance.
 

katoz

New Member
skin resistance lowering when some one lies?this conclusion must be experimental!!!cant believe because there seems to be scientific justification for this!!
 
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