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)

Notes

- 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.