barcode reading circuit
Source: InternetPublisher:风向双子座 Updated: 2011/10/08
![条形码阅读电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/b622e16e-3c63-11ec-871d-086126841eb8.gif)
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