UM3561A is a low-cost, low-power CMOS LSI designed for use in alarm and toy applications (a three siren sound generator). Since the integrated circuit includes oscillator and selector circuits, a ...

UM3561 is an excellent ROM IC that can generate Multi siren tones simulating Police siren, Ambulance siren, Fire brigade siren and Machine gun sound. This 8 pin low power IC can work down to 2.4 volts ...