Sound excitation switch circuit
Source: InternetPublisher:小胖友 Updated: 2012/05/08
![声音激励开关电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/aab79652-3c63-11ec-be74-086126841eb8.gif)
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