Below is a Sallen-key type active LPF which filters out all the ac components and integrates(averages) the incoming 1kHz 1V pulse train.
There are tools to design these filters, but my question is about the op amp part:
If I change this op amp with any other single supply op amp in LTspice I get totally different results. I must say Im not into details of op amps and active filters so please answer as to a beginner.
Why is any generic op amp doesn't work for this circuit? What determines us to choose this particular op amp here? What is so special about LM358 here?