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In Reply to: RE: impedence of CCS mu output posted by bobbyj on April 7, 2010 at 20:18:13:
"This sounds like "equal to". So = is minimum to function and 1:10-20 is "better". This I guessed by novice intuition, unless I've misinterpreted somehow, which I'm good at."
No. 1:10 is minimum. 1:20 is better.
If the output impedance of the stage that is (trying) to drive the RIAA filter was any where near 220k it would sound like crap.
We want the filter to do the filtering, not the inability of the driving stage to drive the filter impedance. If the stage can't drive the filter impedance properly, there would be an additional loss of highs, beyond what was designed.
I might not have been clear on one point.
Let's say you want to build a filter around a R1 (the series resistor) of 220k. This "sets up" the rest of the filter values. You would not use a 220K resistor. You would use a resistor value that, when added to the output impedance of the driving stage, equals 220k.
It seems you have a handle on the rest of it.
Tre'
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Follow Ups
- RE: impedence of CCS mu output - Tre' 04/7/1020:40:39 04/7/10 (2)
- RE: impedence of CCS mu output - bobbyj 10:15:02 04/8/10 (1)
- RE: impedence of CCS mu output - Tre' 10:20:13 04/8/10 (0)
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