This post presents circuit which produces a long up and down variation of the sound that similar to police siren. Circuit is based on two 555 timers which operates in astable mode. In this mode a square wave output is generated.
Components
| No. | Component | Quantity |
|---|---|---|
| 1. | Power supply (9V) | 1 |
| 2. | 555 timer | 2 |
| 3. | Piezo buzzer | 1 |
| 4. | 1kΩ resistor | 1 |
| 5. | 10kΩ resistor | 3 |
| 6. | 68kΩ resistor | 1 |
| 7. | 10μF electrolytic capacitor | 2 |
| 8. | 100nf ceramic capacitor | 2 |
Circuit diagram
Designed circuit
Circuit is designed on a breadboard.
Leave a Comment
Cancel reply