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Re: The neglected factor: self-capacitance of coils ?

First of all, I am very familiar with your writing style and this ain't it. Though you did mess up both the English usage and spelling in quite a few places, it's not enough to fool anyone. Why not provide a proper reference. I really don't understand your complete disdain for references.

In any case, there is something that I don't completely understand. Maybe someone else can help me interpret it:

"If self-capacitance is too much, it will reduce the Q of the of the coil/winding ..."

That's simple enough, but this I don't get:

"... & will be worsen via the dielectric or insulation of the wire or interleaving between windings."

Is the author simply talking about the fact that the insulation has a dielectric factor greater than 1 (that of air)? If so, why not say what it is about the insulation that makes things be worsen? If not, what is he trying to say? c-J, check your transcription. Maybe you left out something important.

Then there's the statement:

"In all cases, the self capacitance of a coil has an apparent effect on its true DCR, true inductance & true Q of the coil itself & at frequencies considerably below the self resonant frequency of the coil."

How? Why? I'm sure that the part about 'considerably below the self resonant frequency of the coil' offers an important clue, but at the moment I don't see it. c-J, did you skip an entire paragraph?

How about telling us where you got this. Obviously it's a printed book, as you had to retype it. Who's the author and what's the title? Maybe someone else has a copy and can offer some insight.

-- Dave

Oh, I almost forgot:

"Quiz: why common mode chokes are typically built of two coils of a few loosely wound wires?"

Whether or not they are typically built that way depends entirely on the intended use of the choke. But, I think I know where you're trying to go. In reply I offer a quiz for you:

1) How is the performance of a CM choke affected by capacitance between windings?

2) Does capacitance between either winding and ground have the same affect?

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