Transistor Circuits

Project

In this project I will show you four simple circuits that use transistors. The circuits are a light/dark sensing circuit and a hot/cold sensing circuit.

Light sensing circuit

This circuit will turn on the LED when there is enough light hitting the LDR you can adjust the amount it will take to turn on the LED by adjusting the potentiometer. You can swap the LED with something else that you want to turn on or off.

Dark sensing circuit

This circuit will turn on the LED when it is dark you can adjust the amount it will take to turn on the LED by adjusting the potentiometer. You can swap the LED with something else that you want to turn on or off.

Hot sensing circuit

This circuit will turn on the LED when it is hot you can adjust the amount it will take to turn on the LED by adjusting the potentiometer. You can swap the LED with something else that you want to turn on or off.

Cold sensing circuit

This circuit will turn on the LED when it is cold you can adjust the amount it will take to turn on the LED by adjusting the potentiometer. You can swap the LED with something else that you want to turn on or off.

Acknowledgement

I thank PCBWay & LCSC Electronics for the partnership.

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Website

Check out more of my other projects on my website.