How to make the UM3561 siren sound generator
The UM3561intergrated circuit is based on a low-power CMOS LSI design. It is included programmed mask ROM to generate three siren sounds and machine-gun sound.[1][2] Its siren type depends on SEL1 and SEL2 pins voltage levels. The required voltages of IC playing modes are listed in table 1. The typical operating voltage is 3V and its operating voltage range is 2.4V to 3.6V.[1][2] IC operated by an RC oscillator and it needs to fix to the external resistor. The resister pins should be fixed in between OSC1 and OSC2 pins of the UM3561 IC.[1][2] Figure 2 is the three sound application circuits. (1: Police Siren, 2: Fire Engine Siren, 3: Ambulance Siren)It has a three-position toggle (ON-OFF-ON) switch to select the siren sound and a sliding switch is used to power up the circuit. You can select a suitable type of switch according to your required application in your project. ( eg.you can use the Push-button switch for momentary situations) Required item list for th