Circuit Diagram of Four Tone Siren
The UM3561 contains programmed mask ROM to simulate siren sound. Power consumption of IC is low.It is powered by 3 Volt. One NPN Transistor is used for amplification of audio signal.
This circuit gives sound of Police siren, Ambulance siren, Fire brigade siren and Machine gun sound.
Resistance = 220 Ohms
Battery Container 3V