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LED怎样看出正负极

更新时间: 2020-09-20 00:00:00     

1、对于普通二极管,可以看管体表面,有白线的一端为负极;

2、对于发光二极管,引脚长的为正极,短的为负极;

3、如果引脚一样长,发光二极管管体内部金属极较小的为正极,大的片状的为负极;

4、或者可打开万用表,将旋钮拨到通断档,将红黑表笔分别接在两个引脚。若有读数,则红表笔一端为正极;若读数为“1”,则黑表笔一端为正极。

关键词: led 怎样 看出 负极

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