Butterworth
R1 = R2 = R
C2 = Sqrt[2] / (2 · pi · Fc · R)
C1 = C2 /2 = (1 / (Sqrt[2]) / (2 · pi · Fc · R)
See also: Notes on Filters
Filter Sallen-Key (SK) Second Order Lowpass I non-inverting
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