Practical circuit diagram of the polygraph

The article said the practical circuit diagram of the polygraph. The principle is simple and very practical. Want more thoroughly grasp the principle, you should understand and be familiar with the major components of the circuit, such as: 2n3565 . This is a simple lie detector, can be built in a few minutes, but it can be very useful when you want to know if someone really tell you the truth. It is not enough mature professionals to use, but it works. It is determined by measuring the skin resistance, when you lie down. Electrode can be alligator clip (although they can be painful), electrode pads, such as the type they use in hospitals), or simply wire and tape. Using circuit, additional electrodes after the subjects' hand, about 1 inch apart. Then, adjust the meter for a reading of 0. Ask this question. You know, this topic is lying when change.

 

Schematic

Parts

 

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)

 

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