Four Tone Siren

Circuit Diagram of Four Tone Siren                                                 UM3561 PROJECT CIRCUIT  UM3561 IC includes  oscillator and selector circuits so few external component is used for construction 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.  Part List : IC UM3561 Resistance = 220 Ohms Condenser 100Mfd Transistor BC548 Battery Container 3V Switches