NE555组成的门铃

　　这是简单的蜂鸣器电路。它使用NE555、25 - 80欧姆扬声器组成。

I demolishes a store-room , see old loudspeaker and other equipment a little again. Then born the though builds Door Buzzer by use , IC 555. Perform sound electric bell origin. When press S1 as a result have a voice fair loud. This circuit almost must not do anything. Because divisible Amen! should use 25-80ohm size loudspeakers. will make good sound use force against electricity low work or economize the electricity. You will may use 9V batteries all right sir.

　　我从废旧的收音机里拆除了一个扬声器，我想用它来制作一个门铃。我使用了一个NE 555和部分电阻电容元件就很方便的组成了一个门铃。当按下S1时，扬声器便发出声音，松开时声音关闭，他其实就是一个电源开关。这个电路应该使用25-80欧姆的扬声器。使用9V电池供电。