Re: Mike Marcum Ferrite Cores

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Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

C-cores. Each one is 2.25" x 4" with a 1" square cross-section. 8 of 
these are being put together in a modified E with the 2x2" center the 
primary and the 4 secondaries on each side (can be paralleled or 
series'd externally to get 12.5-50kV with 370vdc in). I did it this 
way to minimise wire length for a given # of turns (litz is 
expensive) and have core gaps for built in current limiting. It's the 
P ferrite from Magnetics  ( 
http://www.mag-inc.com/ferrites/ferrite_e_i_u_cores.asp  ). Part # is 
OP49925UC. Biggest non-custom core they have.

Mike
----- Original Message ----- From: "Tesla list" tesla@xxxxxxxxxx
To: <tesla@xxxxxxxxxx>
Sent: Saturday, October 08, 2005 1:42 PM
Subject: Re: Mike Marcum Ferrite Cores


> Original poster: mecortner@xxxxxxxxxx
> Well I certainly know about not having the funds
> to finish projects! I wound a nice 10" coil a few
> years ago, even got a big spun torroid for it and
> there it sits on the living room coffee table
> gathering dust. :-P  So that transformer is a
> going to be high frequency inverter type, I bet
> the weight reduction will be a great advantage
> when transporting the beast. What I'm really
> curious about is the ferrite cores you used,
> are they the C-core type or the E-core kind?
> Also about how big are they and what type of
> material did you decide upon?