60 h timing circuit
Source: InternetPublisher:黄土马家 Updated: 2011/03/29
![60 h计时电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/b2d9c49e-3c63-11ec-97ad-086126841eb8.gif)
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