Don:
I will not debate the price issue, because it is highly variable. My
figures are for very high-performance cores, which this is not.
You are missing an extremely important point.The power losses do NOT
scale up linearly with power level. They are extremely non-linear, which is
obvious from the data. Every ferrite material has something that resembles an
exponential rise in power loss vs. frequency and power loss vs. flux density
(at a given freq.).
If you want a copy of my calculations, I will be glad to send them. I
did not post my calculations because I try to keep the reading on this forum
as light as possible. Not everyone who reads these postings has the training
to digest a lot of calculations. I make my calculations off line and list
only the results. I always append notations if any unorthodox calculational
methods have been employed. If you think I don't know what I am doing, I will
be glad to send you a copy, if you will give me at least a hint of what you
think is wrong or has been neglected.
I would also like to re-iterate that my calculations were very simple
applications of the mfrs. data to a toroidal inductor - no rocket science
here. As always, I clearly stated all of my assumptions. The validity of the
mfrs. data is somewhat open to discussion, in my mind (anyone who is
interested in and knowledgable in THAT area, I would really like to talk to).
But aside from that, the rest is applied circuit theory 101.
Eric von Valtier K8LV
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