We can easily make a sound reactive LED by following the simple circuit. The main components which you need for this project are listed below.
- TIP31 NPN Power transitor
- Couple of LEDs
- Power supply (9V)
- Breadboard or PCB
CIRCUIT DIAGRAM
The working of this circuit is based on the input signal applied to the base of transistor. The collector current varies with the amplitude of the audio signal.
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