Light pen interface circuit
Source: InternetPublisher:三月小雨 Updated: 2012/05/18
![光笔接口电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/ab6230b0-3c63-11ec-8e0d-086126841eb8.gif)
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