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电路图附如下：
电路中R1672,R7，R1682，R1681都是用的750欧姆的电阻，输入电压为12V，电流为2A，但是显示的输出电流为2A，输出电压为1.5V，不知道出了什么问题。拆拆焊焊两天了，很难受。
