Simple Electronic Lie Detector Circuit
This super-simple electronic lie detector schematic/circuit relies on the principles of how the body reacts when someone is lying in order to detect lies.
Almost incomprehensibly simple, this lie detector circuit measures the resistance of skin to help detect is somebody is lying. When somebody lies, they tend to sweat. This sweat increases the conductivity of the skin, thereby reducing its resistance. This circuit simply looks for this change in resistance.
There are a total of 6 electronic component in this lie detector, and you will need a 1mA (1 milliAmp) analog meter, which will act as the lie detection meter component. Other than that, there is only 1 transistor, 3 resistors and 1 capacitor - making it an extremely simple circuit by any standards.
One of the resistors is variable, and it behaves "nulling" component, since you will need to calibrate each subject to 0 before being able to accurately detect lies.
Happy lie detecting - let us know if you catch anybody out!
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