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.
　　有一天我去看望一个朋友。他请求我帮助设计一个电铃门电路。要求小巧而且电路简单。然后我选择我选择了扬声器产生声音的电路个他设计。使用NE555产生门铃信号和使用LM386对门铃信号进行放大。通过调节R1的电阻阻值可以调节门铃声音。