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Old 26th August 2011, 07:35 PM   #1
ro9397 is offline ro9397  United States
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Default Formula for CR Xo pole?

For a series capacitor between a line-level output and line-level input, is this the formula to compute the Xo pole?

Fc = 1/2piRC

R = input Z
C = series capacitor value
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Old 26th August 2011, 08:51 PM   #2
DF96 is offline DF96  England
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Not sure what you mean by Xo. The formula you give is approximately correct for the LF rolloff point. The full value is
f = 1/ (2 pi (R1+R2) C )
where R1 is output impedance (or previous stage), R2 is input impedance (of next stage).
As R1 is usually much smaller than R2, and capacitors often have 10% or 20% tolerance, the simpler formula is usually close enough.
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Old 26th August 2011, 09:00 PM   #3
ro9397 is offline ro9397  United States
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Xo, crossover, sorry!

Your math makes much more sense than mine. All I need now is the output impedance of one of the source components.

Thanks very much for your kind reply.
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