Luminous and sound probe circuit
Source: InternetPublisher:同住地球村 Updated: 2020/05/05
![发光与音响探头电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/add3af0a-3c63-11ec-a276-086126841eb8.gif)
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