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wei dian deng kai guan zeng jia xian shi gong neng
Author(s): 
Pages: 38
Year: Issue:  3
Journal: Family Electronics

Keyword:  发光二极管 指示电路 电灯开关 显示功能 指示功能 元件组 附加电路 附图 发光管 工作情况;
Abstract: <正> 夜间,当人们从外面回家或夜间起身需要开灯时,往往不容易摸准电灯开关。因此,为了方便,花几角钱为电灯开关增加指示功能是很有必要的。本文介绍一种能在开关接通时自动熄灭、开关断开时自动燃亮的开关指示电路。该开关指示电路由三只元件组成。电路如附图所示。电路中发光二极管选用Φ3或Φ5直径的红色管;
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