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Active Filter: Butterworth
(2st order, 12 dB/octave, Highpass)

2nd order Butterworth Highpass

C=4.7n-10nF
Ra=0.7071/(2*pi*Fc*C)
Rb=1.414/(2*pi*Fc*C)

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