This touch sensor, found in an American documentation on transistors, has gained 8 million times given by the Darlington stage of 3 transistors. The circuit supplies an LED, but a relay can be used to control larger loads.

This touch sensor, found in an American documentation on transistors, has gained 8 million times given by the Darlington stage of 3 transistors. The circuit supplies an LED, but a relay can be used to control larger loads.