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In Reply to: Re: I'm sure you're right, but that's not what I said. posted by Triode_Kingdom on April 20, 2007 at 14:14:43:
do you have any guestimates on the shunt capacitance of a 5-10hy choke vs. something like 50mhy?
Follow Ups:
> do you have any guestimates on the shunt capacitance of a 5-10hy choke vs. something like 50mhy?The shunt capacitance of a large choke is probably something under 0.001 uF, but that's purely a guess. I suppose a small choke might be on the order of 100 pF or so. How does this relate to the discussion?
so the smaller valued choke may actually provide more impedance as frequency goes up.what does he frequency content of a cap input filter look like?
> so the smaller valued choke may actually provide more impedance as frequency goes upNot unless you're concerned about components in the upper MHz region. If you are, I suggest that you also consider the extremely small reactance of even a 10 uF filter cap at those frequencies, and the rapidly diminshing (i.e. miniscule) energy contained in those upper harmonics. All in all, a larger choke, 10-20 Hy or so, will be much more effective than, say, a 22 mH at the frequencies where XL is needed.
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