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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)

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

Contributor: Joakim Ögren
Source: ?
Please send any comments to Joakim Ögren.