555 sensitive earthquake sound and light alarm circuit
Source: InternetPublisher:奥特man123 Updated: 2010/10/02
![555灵敏的地震声光报警电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/8d9c2446-3c63-11ec-85ff-086126841eb8.gif)
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