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![]() "K7ITM" wrote in message ... I had no particular interest in looking at the B-H curves, since it's distortion in filters I'm interested in, and that's easy for me to test directly. Looking at the B-H curves will save you the trouble of testing core material that is obviously non-linear. If the B-H curve is perfectly linear there would be no distortion in the signals. Some material from just a quick look at the curves would eliminate them from consideration without the time wasted testing them. http://www.ferroxcube.com/appl/info/3B46.pdf With respect to flux density: there seems to be a bit of a disconnect between what I know and what you've written. From Faraday's law of magnetic induction, I expect that for the same inductance with fewer turns, the flux density must be higher: if the inductance is the same, the voltage must be the same for a given current at the test frequency. The same voltage with fewer turns around the same cross- section core implies higher flux density. No? With all things being equal that's true, however not all core material reacts the same. As you can see from the link above things are a bit more complex than they at first appear. Somebody could do a PhD thesis on the subject of designing low distortion magnetic components. http://info.ee.surrey.ac.uk/Workshop/advice/coils/mu/ So far, my tests suggest that you can't draw any conclusions one way or the other from only the relative permeability of the core material. I think it's worth another look myself. -- Regards, Leland C. Scott KC8LDO |
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