I need to find formula for and transfer function of this circuit. I've been working on it for four days and still couldn't solve it.
Also a simulation I did in https://www.falstad.com/afilter/.(added third simulation, and I don't understand, how that works, will try to solve again tomorrow)
I`ve been trying to solve this using these formulas, but it didn't give me the same result,
Here is graph for amplitude- frequency characteristic, I did in maxima, that those formulas gave me.
and code
