Circuit Door Buzzer by NE555 + LM386

Someday I goes to visit a friend. He begs me helps to seek electric bell front door circuit. In model to be simple, use the a little equipment. I then choose the Door Buzzer circuit this give. Because of use , IC NE555 produce electric bell sound and use IC LM386 for amplify talk at one time. For R1 use fine decorate the sound as you like it. request have fun this circuit.

British Police Car Siren by IC 555
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