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放大器输出不稳定

Other Parts Discussed in Thread: LM324, LM393

这是一个通过LM393比较器器产生PWM波控制MOS管的气体流量比例阀的电路板,现在输出极其不稳定,在实验过程中,用手触摸了一下LM324(做放大器用) 的引脚(图中红笔画圈的地方)输出竟然奇迹般的稳定了,断电后重新上电又不稳定,再用手碰一下又稳定了,想问一下这是什么原因,没有电路图纸。谢谢各位了