@ Mustafa my brother’s work is based on PIC 12F675 4 can play the melody software prepared by proton ide I used pic12f675 circuit. In fact PIC16F84 was going to use but 84 to 4 units melody is taking... Electronics Projects, PIC12F675 Electronic Doorbell Melody Circuit Proton ide "microchip projects, microcontroller projects, " Date 2019/08/02