We did this topic when we designed the simulation course, and now the PCB is still on my computer.

This topic can be divided into three parts, one is comparator, the other is amplifier, and the third is analog switch. The function of the comparator is to compare the input voltage with the set voltage, so as to select the conduction mode of the analog switch. Needless to say, the function of the amplifier is equivalent to a switch, through which different feedback resistors can be selected to control the amplification factor.

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