555 simple toy electronic keyboard circuit
Source: InternetPublisher:JFET Updated: 2014/05/31
![555简易玩具电子琴电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/741e7ff8-3c63-11ec-8003-086126841eb8.gif)
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