发布时间:2025-01-30 05:58:01
7805属于芯片,无法直接用万用表测量其好坏,你可以将7805接入电路用万用表测一下输出是否正常。还有,7805的任意两个引脚如果呈现短路状态,也可以判定损坏。
晶体管超外差式收音机(X—921型收音机)每部分的作用及原理
2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01 2025-01-30 05:58:01386米宽261高做电视背景墙做美式护墙板两边护墙板多宽合适
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