Active Filter: Bessel
(4th order, 24 dB/octave, Highpass)

4th order Butterworth Highpass

C=4.7n-10nF
Ra=1.3701/(2*pi*Fc*C)
Rb=1.4929/(2*pi*Fc*C)
Rc=0.9952/(2*pi*Fc*C)
Rd=2.5830/(2*pi*Fc*C)

Contributor: Joakim Ögren

Source: ?

Please send any comments to Joakim Ögren.