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The design of simple digital frequency meter based on single chip microcomputer has some problems in signal processing. What should I do after zooming in?
How much is once in a while?

If it is not too high, you can use LM3 1 1, and pay attention to the output Gallagher resistance.

If the frequency is high, check the dedicated comparator in the AD or TI official website.

Your amplifier circuit may have too large a magnification or too large an input, so that the output is beyond the output range of the operational amplifier.

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