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关于双电源供电的电压比较器输出电压

Other Parts Discussed in Thread: LM139, LM358, LM393

对于LM139,当采用双电源+/-15V供电时,电压比较器输出的高低电平具体是多少伏?输出端是否必须要有上拉电阻,上拉电阻阻值如何选择?引入上拉电阻后输出高低电平如何计算?