Secondary Formers

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Secondary Formers
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Sat, 22 Aug 1998 22:52:00 -0500
• Approved: tesla-at-stic-dot-net

----------
From:  Mark Finnis [SMTP:mefinnis-at-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-dot-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-dot-com.au/~dkfinnis

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