how to construct a simple lie detector


Simple Lie Detector

Description

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.

Circuit diagram

Simple Lie Detector-Circuit diagram

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

  • 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.
  • 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.

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Author and source

–>circuit from http://www.aaroncake.net/

 

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4 thoughts on “how to construct a simple lie detector

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