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Re: Home Made Variac



At 08:33 PM 02/11/2000 -0600, you wrote:

>
>
>Hmmmm...   im lost now ....   why wouldnt a carbon brush "short out" the
>several turns as a metallic "brush" would ???  arent both materials made
>to conduct electricity ???  I understand that carbon has some
>resistivity to it but is it that high that it would matter compared to
>say a metallic brush? 
>
>
>Scot D
>

Everything you ever wanted to know about carbon brushes and a lot more can
be found at the following link...  "Circulating currents" is of interest here.

http://www.sarp-eng-dot-com/brushes/nkf/index.htm

Cheers,

	Terry



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