Jim's correct - we used different terms to describe the same phenomena.
And, it should not be forgotten that even if you can characterize a
component in a test fixture and develop an accurate model of that
component reflecting all its manifestations, it may work differently
when installed in the real circuit, unless the test fixture and test
conditions exactly duplicate the in-circuit conditions.
A simple example is the unwanted capacitance from an inductor's windings
to the PCB surface or chassis or nearby components.
One final note about toroids - in addition to the usual inductance
caused by windings around the core, there's a second inductive
element--a single turn inductor formed by the windings looked at
broadside. It's instructive to remember this effect as it can be
responsible for unwanted inductor interaction when trying to wring out
the last dB of stop band in a filter.
It also means the often repeated statement that a toroid is "self
shielding" and has no external field is a questionable approximation to
the real world. (and yes, there are other effects at work as well that
cause toroid leakage inductance.)
Jack K8ZOA
On 1/2/2013 1:19 PM, Jim Brown wrote:
On 1/1/2013 9:02 AM, Jim Brown wrote:
All real components have "stray" electrical elements due to their
physical construction.
When comparing Jack Smith's ((K8ZOA) excellent and detailed post in
this thread, his use of "parasitic" is the same as my word "stray."
That is, we're talking about exactly the same thing. The difference is
I purposely simplified the explanation for those with less technical
background. I like the word "stray" better, both because it's the way
I learned to talk about 60 years ago, and because it also describes
phenomena that is unintended.
73, Jim K9YC
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