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dian yuan xian gu zhang bao jing qi
Author(s): 
Pages: 18
Year: Issue:  5
Journal: Family Electronics

Keyword:  电源线 报警器 故障 印刷电路板 天线 电路原理 运行中 强信号 与非门 电路组成;
Abstract: <正> 一款实用、简洁的电源线故障报警器电路原理如图1所示。印刷电路板如图2所示。它主要用于探测正在运行中的电源线是否发生故障。电路组成该电路由天线、三极管 TR1、TR2、四2输入与非门 CD4011(IC1)和一只小喇叭组成。天线用普通电线在运行中的电源线上
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