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Ferrite rods
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From: Bill the arcstarter [SMTP:arcstarter-at-hotmail-dot-com]
Sent: Friday, February 20, 1998 10:37 AM
To: tesla-at-pupman-dot-com
Subject: Ferrite rods
It was written:
>>From: Edward V. Phillips [SMTP:ed-at-alumni.caltech.edu]
>>"Over the weekend I fluoro'd a commercially-made rod choke, >about
>>1/2 inch in diameter by 5 inches long. The inside was composed >of
>>five 1-inch lengths of ferrite bar, with about a 1/16 inch gap
>>between each rod. Perhaps Malcolm's comments explain why this
>>wasn't just one solid ferrite bar."
>
>Any idea what the inductance is? The effective permeability
>of that gapped rod core is probably less than 20, so wouldn't
>expect enough inductance to be of any use for TC work. What
>frequency does it operate at? Flux density is proportional to the
>voltage across the coil and inversely proportional to core area,
>number of turns, and frequency.
I'll go measure the inductance it this weekend. It was used in a
sparkgap configuration inside a Hobart welder, with two 0.004 uf caps in
parallel, all bussed together with 3/16 wide copper bars. The "primary"
consisted of ten turns around the ferrite bars, so the inductance will
be tiny at best.
I checked out and ordered a bunch of stuff from Amidon. Thanks for the
tip! They have all sorts of ferrites, iron powder, and other forms
available.
-Bill the arcstarter
Amidon: http://www.bytemark-dot-com/amidon
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