Touch Sensor Circuit
The Simple Touch Sensor Circuit is Designed with three components such as a resistor, a transistor, and a light emitting diode. Here, both the resistor and LED connected in series with the positive supply to the collector terminal of the transistor. Select a resistor to set the current of the LED to around 20mA.
Simple Touch Sensor Circuit
Now Simple Touch Sensor Circuit gives the connections at the two exposed ends, one connection goes to the +ve supply and another goes to the base terminal of the transistor. Now touch these two wires with your finger. Touch these wires with a finger, then the LED lights up.