The two push-pull transistors are one up and one down, and they work alternately. What I want to ask is that the base of the lower tube is working at a low level, and at this time the upper tube is tu
Hawking once issued a serious warning when he was alive. The reason was that the radio telescope "Sky Eye" received a suspicious signal from outer space 4 light years away.After learning the news, Haw
[b][size=4]From now until April 13, download any USB-related development and testing materials below to have a chance to win a 50-yuan Jingdong card (35 copies in total). You will also have the opport