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.
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