6V Touch Switch Circuit Diagram

Touch switch 1

When a finger touches the ON electrode, the circuit detects the skin resistance and provides a very small current to the composite transistor to open the circuit and turn on the 6V small light. At this time, the BC557 transistor C pole potential rises to nearly 6V, and the 4M7 resistor replaces the finger resistance to keep the circuit open.

To close the circuit, a finger touches the OFF electrode and the finger resistance will activate the first transistor, which will shunt the composite transistor base voltage and the circuit will close.

Touch switch 2

The circuit detects the skin resistance of the finger and controls the circuit to open for about 1 second. The output of the counting circuit can be taken. In static mode, the circuit does not consume current:

Touch switch 3

This circuit detects the skin resistance of the finger and controls a relay. When the relay is turned on, a normally open contact is used to keep the relay in the working state. Turn off the power and the relay resets.