Re: solid-state TC, transformer design

To: tesla-at-pupman-dot-com
Subject: Re: solid-state TC, transformer design
From: "Harri \"Haba\" Suomalainen" <haba-at-cc.hut.fi>
Date: Wed, 23 Oct 1996 19:16:18 +0300 (EET DST)

On Tue, 22 Oct 1996, Tesla List wrote:
Glad to hear there are more experimenters than Alan and me out there!
I had already began to think weather it is reasonable at all to
spread this discussion all over the world!

>    I guess I've made a few mistakes already! I'm using a toroid core
> instead of a bobbin core and I'm also using solid #10 guage house wire
> for the primary wound for push pull operation. I've coated the core with

Toroid is fine, if not better in the view of magnetics. However, as
we think of heat transfer we soon find out that core is enclosed
with lots of insulators. That is a bad thing. That's why toroid are
usually not good for PSU cores.

However, there are other winding topologies actually involving
stacks of toroids (it lookses like OO). It is not that closed
when you wind the transformer through the two holes. It is the
only way for getting into real high frequency I think. It is not
good for coiling as large number of turns is hard to fit. Insulating
that biest is also very nasty. :(

> epoxy resin, wound the primary, then coverd the primary with scotch 130c
> high voltage spicling tape. The tape has voltage rating of 69KV .The

Wow, I wish all that nice stuff like mylar foil and scotch hv tape
were available over here. So far I've always had only a choise of
improvizing something. The last design involved some teflon foil
(intended for cooking :) and looked pretty neat. However, that is when
I really noticed how awfull resonanses can be. It was too tightly wound
and had self resonance way too low :(

--
"99% of the pain in the world is due to misunderstanding" -M. Jarvelainen

Harri.Suomalainen-at-hut.fi - PGP key available by fingering haba-at-alpha.hut.fi