Re: PC board primaries

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Jim,

I have never hear of this being done but it sounds like a great idea for a
modest sized coil.  The board and etching will probably cost a little more
than some things, but not bad.  Heat "might" be a concern but I think it
will work fine.  You may consider a HV coating to discourage surface arcing
between turns.

Cheers,

	Terry

At 01:43 PM 12/7/2001 -0800, you wrote:
>Has anyone ever tried making a flat primary by etching a piece of copper 
>clad board?  With suitable copper thickness, the AC resistance might not be 
>all that bad (skin effect, and all).  Say you etched  a 1/2" wide spiral 
>trace... 2 oz copper is 0.007112 cm  Skin depth at 300 kHz in copper is 
>around 0.01 cm..  Double sided board, with the spiral on both sides, might 
>have a decent cross sectional area.
>