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Simple and practical delayed lights-off circuit
Source: InternetPublisher:清宁时光 Updated: 2020/06/09
![简单实用的延时熄灯电路](http://www.eeworld.com.cn/circuit/upload/eee6ea0075d590179e52e02ddb54d435/25514e873e36ddcf30b391f2f7708668.gif)
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