The Touch-Enabled Light

In this circuit, you’re going to build a touch sensor. You’ll create a touch-pad from two uninsulated wires. If you don’t have any wire, you could clip off a bit of the legs of one of the components.

These are the names of the transistor pins:

Note that if you are using a different transistor than the BC547, the pins may be arranged differently.

Here’s a video of the version I built. I needed to wet my finger bit to get the LED to turn on:

The Circuit Diagram

Find the components used in the table below. Click here to buy the complete kit.

Part Value Note
R1 470 Ω A standard resistor
LED Red/Yellow/Green Standard output light-emitting diode
Q1 BC547 General-purpose NPN transistor

Are You Stuck?

Let me know your questions and comments in the comment field below

Leave a Reply

Your email address will not be published.