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V2EX  ›  光耦
kekeones 光耦+电阻可以检测交流电吗?
程序员  •  kekeones  •  Feb 25, 2022  •  Lastly replied by mrcn
8
sujin190 关于老式两线电话门铃智能化改造
分享创造  •  sujin190  •  May 29, 2024  •  Lastly replied by virusdefender
32
mathcoder23 单片机如何检测家用电灯是否通电?
硬件  •  mathcoder23  •  Apr 7, 2016  •  Lastly replied by gamexg
5
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