Speed warning circuit
Source: InternetPublisher:消失的歌 Updated: 2011/07/07
![超速招警电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/b1c654c6-3c63-11ec-a492-086126841eb8.gif)
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