Input & Feedback filters - Page 2

lhwidget · 26th June 2009, 01:17 AM

Thanks Pacific, I appreciate the nudge. (and it's only 454 pages long

)

lhwidget · 27th June 2009, 10:16 PM

I get it now

I was just slow to see it in your equations. Instead of the gain being expressed in simple resistances it should be expressed as impedances of the Rf and Ri, Ci legs of the circuit.

Gain = (Zf + Zi) / Zi, where
Zf = X(Rf) = Rf ohms
Zi = X(Ri) + X(Ci), where X(Ri) = Ri ohms and X(Ci) = 1/(2•pi•f•Ci) ohms

Thanks!

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26th June 2009, 01:17 AM	#11
lhwidget diyAudio Member Join Date: Oct 2008	Thanks Pacific, I appreciate the nudge. (and it's only 454 pages long )

27th June 2009, 10:16 PM	#12
lhwidget diyAudio Member Join Date: Oct 2008	I get it now I was just slow to see it in your equations. Instead of the gain being expressed in simple resistances it should be expressed as impedances of the Rf and Ri, Ci legs of the circuit. Gain = (Zf + Zi) / Zi, where Zf = X(Rf) = Rf ohms Zi = X(Ri) + X(Ci), where X(Ri) = Ri ohms and X(Ci) = 1/(2•pi•f•Ci) ohms Thanks!

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