Nokia has finally changed its leader, under pressure from performance. There have been many comments from the outside world about Nokia's change of leadership, naturally there are both optimistic and
It seems that I really need to work hard. I failedThe error is: the two capacitors are in the wrong position. I think the rear stage needs to use polarity. Is it okay if the front stage does not need
This single chip microcomputer is mainly used to control switches. The single chip microcomputer controls relays. The specific requirement is that when the voltage value is less than 170V, the single