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输入15V到21V,本来打算做30V到36V输出，但是输出调节到最大60V后，然后自己又自动下降，直至26v不变，MOS管irf540，3个脚的波形都一样，如下图，电路图也如下，请问是什么原因啊
查一下0.5欧电阻是否开路了。
没有开路
工频噪音已被注入，说明电路；至少示波器探头是悬空的。建议仔细核查一下。
仔细核查了，还是那样
