Sunday, October 16, 2011

Lie Detector

Here is a simple lie detector that can be built in 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 those that the pros use, but it works. It works by measuring skin resistance, which goes down when you are lying.

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
MISC1Case, Wire, Electrodes (See Nots)


- The electrodes can be alligator clips (although they can be painful), electrodes (like the kind they use in    hospital), or just the son and bands.

- You can use the circuit, connect the electrodes to the back of the hand subjects, approximately 1 cm intervals. Then adjust the meter reading 0 Applications. He knows the subject is lying when the meter changes.

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