Simple Touch Switch Circuit Using Transistor. This is very simple circuit which turns on led by touching finger. We can also use these devices for faster switching and pulse width modulation control unlike traditional mechanical switches.
Connect the base pin of the 2nd transistor to the emitter pin of the 1st transistor. Refer to the circuit diagram for better understanding. We can also use these devices for faster switching and pulse width modulation control unlike traditional mechanical switches.
So we have used two.
By using a transistor as a switch we can drive 12v or even high voltage loads with a 5 volt digital logic signal. 2 bc547 or any other npn transistors resistors. Touch switch using single npn transistor in this circuit project i will show you how to build a simple touch switch using a single transistor. This simple circuit consists of few components.
