Make Simple Touch Sensor Using BC547 Transistor

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Components required -

(1.) Battery - 9V x1

(2.) Battery clipper x1

(3.) LED - 3V x1

(4.) Resistor - 470 ohm x1

Firstly solder 470 ohm resistor to collector of the transistor as shown in picture

and then solder negative wire of LED to the 470 ohm resistor as shown in the picture.

Now solder battery clipper wire to the circuit as picture.

Solder +ve wire of battery clipper to the +ve of LED and

connect -ve wire of battery clipper to emmiter of the transistor as shown in the image.

Now circuit is ready -

Connect 9V battery to the circuit and touch base wire of transistor and 470 ohm resistor wire as shown in picture.

Observation - After touching the circuit wire we observe that the LED is start glowing, as we remove hand to the circuit we observe that LED is turn off.This type this simple touch circuit is working.

Thank you