Mining lamp alarm circuit
Source: InternetPublisher:常思一二 Updated: 2012/06/25
![矿灯报警电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/b217aa48-3c63-11ec-872e-086126841eb8.gif)
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