Active Filter: Butterworth
(4th order, 24 dB/octave, Lowpass)

R=4.7k-10 kOhm
Ca=1.0824/(2*pi*Fc*R)
Cb=0.9239/(2*pi*Fc*R)
Cc=2.6130/(2*pi*Fc*R)
Cd=0.3827/(2*pi*Fc*R)

Units: R [Ohm], Cx [F], Fc [Hz]

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