Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch circuit with 4011 – ...

The input impedance of the trigger is very high and the touch sensor switch can be triggered by the voltage induced in the human body. The relay is a 12 V DC relay operating at currents less than 200 ...

Suppose you want to improve the look and feel of a product by using a touch sensor, but can’t afford the fancy controller IC. You could then consider a simple four-component circuit which allows ...