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Ferrite rods




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From:  Bill the arcstarter [SMTP:arcstarter@hotmail.com]
Sent:  Friday, February 20, 1998 10:37 AM
To:  tesla@pupman.com
Subject:  Ferrite rods

It was written:


>>From:  Edward V. Phillips [SMTP:ed@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.com/amidon



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