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Re: Are you talking about CM choke or coil winding in general?

If you read the post carefully it should be obvious whether I was talking about CM chokes in particular or coil winding in general.

I used Visio to make the drawings.

I drew on my own knowledge after decades of studying chokes and transformers. The three flavors of capacitance do exist in common mode chokes. It is elementary and obvious to anyone with a firm grasp of the subject.

I thought it was obvious that a common mode choke must have two coils. Perhaps the simplest way to explain it is by symmetry; common mode signals, by definition, are identical on two terminals. Any processing of those signals must treat both terminals equally. That means two of everything.

-- Dave

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