Music Rhythm Operated LEDs using BC547 Transistors

This post presents circuit for blinking LEDs according to rhythm of the music. A microphone picks up sound waves and converts them into an electrical signal. Circuit is based on BC547 transistors which works as signal amplifiers that makes LEDs to blink according to music rhythm.

Components

No.ComponentQuantity
1.Power supply (9V) 1
2.BC547 transistor4
3.Electret condenser microphone1
4.1kΩ resistor3
5.10kΩ resistor2
6.1MΩ resistor1
7.100nf ceramic capacitor1
8.LED3

Circuit diagram

The sensitivity of microphone depends on ​values of R2 resistor and C1 capacitor.

Music Rhythm Operated LEDs using BC547 Transistors (Circuit Diagram)

Designed circuit

Circuit is designed on a breadboard.

Music Rhythm Operated LEDs using BC547 Transistors (Designed Circuit)

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