20kHz~20kHz variable audio oscillator
Source: InternetPublisher:风向双子座 Updated: 2011/03/03
![20kHz~20kHz可变音频振荡器](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/fb972228-3c63-11ec-a88f-086126841eb8.jpg)
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