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.
Here are the details of the specific parts you will need
Part Total Qty. Description Substitutions
R1 1 33K 1/4W Resistor
R2 1 5K Pot
R3 1 1.5K 1/4W Resistor
C1 1 1uF 16V Electrolytic Capacitor
Q1 1 2N3565 NPN Transistor
M1 1 0-1 mA Analog Meter
MISC 1 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.
the meter, does anyone know where to get one of the cheap. I went to local electronics store and the cheapest I saw was 5 bucks. What meter did you use OP. or could you cut me a link to some cheap ones.
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.
Electrode:
A solid electric conductor through which an electric current enters or leaves an electrolytic cell or other medium.
A collector or emitter of electric charge or of electric-charge carriers, as in a semiconducting device.
The 2N3565 NPN Transistor is not available in my place.Can i use a substitution for that.Someone please reply as to where i can get that transistor.I live in india in a place called Mangalore.I liked the idea of this project and decided to do it.But now the transistor and the analog meter in unavailable.So pls tell me where can i get these two parts.
The 2N3565 NPN Transistor is not available in my place.Can i use a substitution for that.Someone please reply as to where i can get that transistor.I live in india in a place called Mangalore.I liked the idea of this project and decided to do it.But now the transistor and the analog meter in unavailable.So pls tell me where can i get these two parts.