Telephone indicator circuit
Source: InternetPublisher:笑流年 Updated: 2017/12/23
![电话指示灯电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/48ba88c6-3c63-11ec-987d-086126841eb8.jpg)
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