那个原理图里的滑阻我是用来调输出电压的，空载的时候我调到5V，但是负载一加50欧的滑阻上去后输出电压就降下来了，最高也就在2V左右了，后来换了100欧的水泥电阻也是这样，各位大佬求助了/(ㄒoㄒ)/~~ PS：（还是个新手，有什么不足的地方希望能直接指出）
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