发布时间:2025-02-06 21:20:33
要使用一个电阻和三极管来实现,三极管要用NPN的8050,见图当门磁断开,三极管有基极偏置而导通,继电器吸合,继电器开关接通12V,声光报警工作。
北京公积金大概要多久能下来 quot北京公积金提取大约需多久quot
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