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A circuit that adjusts the current of a light-emitting diode according to the surrounding brightness
Source: InternetPublisher:已注销 Updated: 2010/01/31
![](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/c6841546-3c63-11ec-a8e3-086126841eb8.gif)
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