555 metal detector circuit
Source: InternetPublisher:张小哥 Updated: 2010/01/21
![555金属探测器电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/6eee2576-3c63-11ec-a979-086126841eb8.gif)
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