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Active Filter: Bessel
(3st order, 18 dB/octave, Lowpass)

3st order Butterworth Highpass

R=4.7k-10 kOhm
Ca=0.9548/(2*pi*Fc*R)
Cb=0.4998/(2*pi*Fc*R)
Cc=0.7560/(2*pi*Fc*R)

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