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Active Filter: Butterworth 24dB Highpass

(4th order, 24 dB/octave, Highpass)

4th order Butterworth Highpass

C=4.7n-10nF
Ra=0.9239/(2*pi*Fc*C)
Rb=1.0824/(2*pi*Fc*C)
Rc=0.3827/(2*pi*Fc*C)
Rd=2.6130/(2*pi*Fc*C)

Units: Rx [Ohm], C [F], Fc [Hz]