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thanks for your thoughts. this one is particularly interesting "So now, instead of flux running the length in the same direction of the plate of steel, flux is now entering the plate increasingly perpendicularly. Thus creating eddy currents at right angles to the flux lines. "
That was what I was trying to visualize: how an air gap could change flux paths in the direction of more eddy losses in the base plate. So now that must also be considered as a workable hypothesis.
Incidentally, I don't think the base plate is saturating normally. I don't read any Br under it, even tho it is only .030" thick. That was one of my thoughts for an improvement, except it doesn't seem to need improving upon.
and the 10V stimulus (thru 250K) only results in an ~1V signal at the pickup, which is about the range of normal operation. I hope that isn't permanently magnetizing anything! Plus I read the high RAC/Low Q numbers before I hooked the pickup up to the scope to see what the resonance looked like.
great thoughts! thanks for them!
That was what I was trying to visualize: how an air gap could change flux paths in the direction of more eddy losses in the base plate. So now that must also be considered as a workable hypothesis.
Incidentally, I don't think the base plate is saturating normally. I don't read any Br under it, even tho it is only .030" thick. That was one of my thoughts for an improvement, except it doesn't seem to need improving upon.
and the 10V stimulus (thru 250K) only results in an ~1V signal at the pickup, which is about the range of normal operation. I hope that isn't permanently magnetizing anything! Plus I read the high RAC/Low Q numbers before I hooked the pickup up to the scope to see what the resonance looked like.
great thoughts! thanks for them!
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