(Note: electronic lie detectors are not healthy for human trust and results of such machine is not admissible in U.S. court of law. Such results to sway case determination judgment casts fate of a case to only two outcomes, excluding judgment in disposition that before and after other case results will affect at case opening that may interject the outcome as a human position of a judgment overruling.The source of this schematics were acquired from Google.com/images search results)
Using the 2N2222 transistor (audio amp one, NOT the 2N2222A or P2N2222) for basic logic touch switch circuits. The left circuit with two probes (does not operate here as would in real life because it's designated with grounds where to touch, so it's like a human touching both) required to both be touched to light the L.E.D. and the other circuit on the right only requires the one probe to be touched to light the L.E.D. - nforystek
