You only need three components:
A transistor, a resistor, and an LED.
Connect the resistor and LED in series from the positive supply to the collector of the transistor.
Connect the emitter of the transistor to the negative terminal of the supply.
Now, create two wires with exposed ends – so that you can see the metal.
One goes to the positive supply. The other goes to the base of the transistor.
That's all it takes.
Check out the video of me building it here
Now, try to touch these two wires with your finger – and the LED lights up!
The reason is that your finger acts as a resistor and will give enough current to the base of the transistor to turn it on.
You might need to wet your finger for a better connection.
If you want to learn electronics, building simple circuits like this is a good start. Then try to understand what is going on - why the circuit works like it does.
Keep On Soldering!
Oyvind @ build-electronic-circuits.com
PS! Wherever you are on your journey, if you want to improve your electronics skills - here are two ways I can help you learn electronics:
- Ohmify: The touch circuit is one of the circuits you'll build when you go through the learning program in Ohmify. Along with lots of other fun circuits. Click here to learn more >>
- Getting Started With Electronics is a short and beginner-friendly eBook I wrote to help people get started. It contains simple circuits you can build to get started in electronics. Perfect for complete beginners.
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