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UM3561 Police, Fire Engine, Ambulance and Machine Gun Sirens



This UM3561 Police, Fire Engine, Ambulance and Machine Gun Sirens circuit diagram is based on a specialized IC UM3561, which is a low power CMOS LSI specially designed for this type of applications. The UM3561 siren alarm contains all needed parts ( oscillator , selector circuits , programmed mask ROM ) to simulate siren sound using few external components.

The siren circuit require a power supply circuit around 3 volts and has a low current. The UM3561 siren sound generator circuit has possibility to generate four types of sounds : police siren, fire engine siren, ambulance siren and machine gun sound.

The transistor used in this project must be 2SC9013 , 2SC8050 or similar type.

The speaker used at the output must have 8 ohms impedance and a 0.2 watts power.



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