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运放电路求教



想设计一个脉冲采样电路,输入5V/12V/48V脉冲电压,信号频率小于1KHZ,采样电路对输入脉冲的影响要尽量小,采样得到的脉冲信号最终输出到3.3V的MCU,并且需要隔离,有好的方法不或推荐电路?