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RE: Toroid cores for GDTs
Original poster: Skip Malley <skip@xxxxxxxxxxxxxxx>
Steve,
thanks for the link. I am a bit surprised that the ones you showed
are that much better since the design looks identical except for the
mounting base. Obviously, the shielded windings is a totally
different thing. The Circumferential Overlaid xfmr in the photos
looks virtually identical to the LSE part that I indicated. The LSE
part has a large base and likely, the separating of the wires going
to the base contributed to the additional leakage inductance.
Look at http://www.theweyside.com/photos/GDT.jpg The one on the
right is the LSE part. The Pulse Engineering part on the left has 10
times the leakage of the other. Obviously, the home made ones
improve that by another couple notches.
Happy coiling to all.
Skip
At 03:15 PM 1/29/2006, you wrote:
I would love to see a photo of something that is better than the
trifilar wound toroids that I referred to.
James Pawson did a lot of work on this a couple of years ago and
claims leakage inductances as low as 0.08 microhenries with about
450uH magnetizing inductance. The datasheet you posted claims 0.47uH
with about the same magnetizing inductance. So amateur built GDTs
can do about 6 times better than the LSE part.
http://thedatastream.4hv.org/gdt_prac.html