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Active Filter: Butterworth
(3st order, 18 dB/octave, Highpass)

3rd order Butterworth Highpass

C=4.7n-10nF
Ra=0.500/(2*pi*Fc*C)
Rb=2.000/(2*pi*Fc*C)
Rc=1.000/(2*pi*Fc*C)

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