[Prev][Next][Index][Thread]
Secondary Formers
-
To: "'Tesla List'" <tesla@pupman.com>
-
Subject: Secondary Formers
-
From: Tesla List <tesla@stic.net>
-
Date: Sat, 22 Aug 1998 22:52:00 -0500
-
Approved: tesla@stic.net
----------
From: Mark Finnis [SMTP:mefinnis@medicine.adelaide.edu.au]
Sent: Saturday, August 22, 1998 7:38 PM
To: Tesla List
Subject: Re: Secondary Formers
At 16:09 22/08/98 -0500, you wrote:
>Forget the cardboard!!!!. The wall thickness is way to large and carboard is
> lossy. Next problem if your secondary ever has internal arcing you can
trash a
> cardboarded one right away. Small coils (under 800 Watts input) can get away
> with cardboard, but not yours!! You wouldn´t build a very successful coil
with
> it. If money is no object, try using plexiglas or lexan tubing. Your next
bet
> would be PP
While we are on the subject of formers (AGAIN !). Managed to pick-up a
nice little (hehe) piece of Med.Density PolyEthylene for a bargain price.
Normally about $150US / meter and the off-cut cost me $12US. The following
shows this next to my first 6" coil:
www.cobweb.com.au/dkfinnis/images/coil2_former.jpg
I figured MDPE would be good, as we use LDPE for HV caps etc. Cut a piece
off and put it in the MW oven on high for 1 minute with no heating evident.
My only concern is have noted in various posts:
increased wall thickness = increased losses
Any experience / comments welcomed.
Mark
http://www.cobweb.com.au/~dkfinnis