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. | Component | Quantity |
|---|---|---|
| 1. | Power supply (9V) | 1 |
| 2. | BC547 transistor | 4 |
| 3. | Electret condenser microphone | 1 |
| 4. | 1kΩ resistor | 3 |
| 5. | 10kΩ resistor | 2 |
| 6. | 1MΩ resistor | 1 |
| 7. | 100nf ceramic capacitor | 1 |
| 8. | LED | 3 |
Circuit diagram
The sensitivity of microphone depends on values of R2 resistor and C1 capacitor.
Designed circuit
Circuit is designed on a breadboard.
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