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一般电路是把反馈信号接3842的2脚，但现在很多都饶过内部的运放，直接将TL431跟PC817反馈的信号加在1脚，把2脚接地，再从8脚接个1K左右电阻到1脚，请问这个电阻对环路有什么影响，这时候的环路增益该怎么算
