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Simple Lie Detector

Simple Lie Detector

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.

Part

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 alligator clips (although they can be painful), electrode pads (like the type they use in the hospital), or just wires and tape.
2. To use the circuit, attach the electrodes to the back of the subjects hand, about 1 inch apart. Then, adjust the meter for a reading of 0. Ask the questions. You know the subject is lying when the meter changes.

Source: Electronics Lab

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Read disclamer, please!

 

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