Until such time elapses, the lie detector gives no indication although diodes D1 and D3 provide a rapid response of the circuit. Human skin lie detector schematic. Potentiometer P1 allows you to ...

These switches offer twice the functionality in half the size, meeting the growing demand for miniaturized yet dependable ...

They do this by changing the length of some resistance wire in a circuit. The circuit diagram below shows a variable resistor being used to control the current through a bulb.