Siren circuit is built on the PIC12F675 microcontroller, and the outputs of the PIC12F675 are powered by a 6-transistor bridge amplifier. Considering that the resistance of the siren is 2 Ohms, the output power is about 25W. According to... Electronics Projects, PIC12F675 Police Siren Circuit Real Sound "microchip projects, microcontroller projects, pic12f675 projects, " Date 2022/02/27