Hello
I have created a design for a butterworth second order filter (sallen key), and for the same fc, filter pro give differents values:
For example, I try at my office for a low pass, 2nd order butterworth sallen key , and the value for the resistances are the same, but not on the same order when I try at home, with the same caractéristics ! (R1 and R2 are inverted)
The same thing with C1 and C2 in a high pass.
Some one can explain me?
thanks
