如何在电路板上看焊电解电容的位置

2025-03-16 13:21:54
推荐回答(2个)
回答1:

百度知道用户你好答案如下满意请采纳:
电解电容器的使用注意事项 1、 电解电容器由于有正负极性,因此在电路中使用时不能颠倒联接。在电源电路中,输出正电压时电解电容器的正极接电源输出端,负极接地,输出负电压时则负极接输出 端,正极接地.当电源电路中的滤波电容极性接反时,因电容的滤波作用大大降低,一方面引起电源输出电压波动,另一方面又因反向通电使此时相当于一个电阻的 电解电容器发热.当反向电压超过某值时,电容的反向漏电电阻将变得很小,这样通电工作不久,即可使电容因过热而炸裂损坏. 2. 加在电解电容器两端的电压不能超过其允许工作电压,在设计实际电路时应根据具体情况留有一定的余量,在设计稳压电源的滤波电容时,如果交流电源电压为 220~时变压器次级的整流电压可达22V,此时选择耐压为25V的电解电容器一般可以满足要求.但是,假如交流电源电压波动很大且有可能上升到250V以 上时,最好选择耐压30V以上的电解电容器。 3,电解电容器在电路中不应靠近大功率发热元件,以防因受热而使电解液加速干涸. 4、对于有正负极性的信号的滤波,可采取两个电解电容器同极性串联的方法,当作一个无极性的电容。

回答2:

一个一边白,一边没有颜色的圆形

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