G
George Herold
- Jan 1, 1970
- 0
Permeability to the outside world is only slightly higher than 1, because
it's necessarily an open magnetic loop. A solid toroid will give you
about mu times the coil's air-cored inductance, but that doesn't help much
because none of that flux was gained from the outside world.
Yeah no torroids.... unless you're making a flux gate thing.
Since effective permeability is so low, material doesn't matter -- #33
(reasonably flat mu tempco, unremarkable otherwise) and #61 (lower mu,
high frequency, average tempco) rods are readily available from Amidon,
and I think other types.
So you're saying there will be very little voltage gain, with a
ferrite plus coil, vs just the coil? (I must admit I find magnetic
materials a confusing lot.) That's OK I hopefully won't make the same
mistake twice.
George H.