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LM393电压 比较器一直输出高?

Other Parts Discussed in Thread: LM393

如图。输出电平一直是高电平。3904一直导通,然后BOUT就一直有输出。这是网上找的一个欠压保护的电路。供电电压都为24V。是跟灌入电流大小有关系吗?应该怎么改?