This is a very basic electronic DIY kit for electronics beginners. There are few LEDs in the circuit that can be turned on by sound. The larger the sound intensity the more the LEDs glow. There is a microphone in the circuit which is sensitive enough to pick surrounding sounds.
When music or other sounds are heard, the LED lights will flicker with the rhythm of the sound(sound speed).
3-4.5V. If you need a higher working voltage, you can add current limiting resistance to the LED.
1. The sound control LED light circuit consists of a power circuit, microphone amplifier circuit and LED light indicator circuit.
2. The power supply input is from JP, and C1 filter power supply path is used. The small electret microphone converts the sound signal into an electrical signal.
3. The electrical signal is coupled through C2 to Q2 and amplified.
4. The amplified signal is then sent to Q1 base. Q1 will initiate the LED to flicker. The louder the sound, the higher the LED brightness.