yes or not, u have to make neg input > pos input voltage, in order to get the negative feedback; however, if you want to make it oscillate, you could switch this two to produce positive feedback. Just in case, as far as I understand, you mean to get negative feedback, therefore, you cannot make the switch
Don't know much. But I think B2 is for visiting, you just meet your parents in China, and then they apply B2 to visit you? If you really want to try, you need to make a reasonable explain.
【在 h**h 的大作中提到】 : Don't know much. But I think B2 is for visiting, you just meet your parents : in China, and then they apply B2 to visit you? If you really want to try, : you need to make a reasonable explain.