RE: [TCML] "Wall Wart" Transformers

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Friends,

It may be instructive to point out we are dealing with 60hz or worse 50hz
AC. Core size reduces dramatically as we move up into higher frequencies.

A new person may want to know this is why airplane transformers are
generally run at 400hz - to save core weight.

However, the frequencies of say 60hz laminated cores can handle are limited
due to heat losses and eddy currents. This is the domain of HF ferrite
cores!

You have the right idea on turns ratio. As almost always, there is lots of
other stuff to consider too. HF is becoming more the norm as SS components
can handle higher currets.

Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Phillip Slawinski
Sent: Monday, March 23, 2009 7:54 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] "Wall Wart" Transformers

Sorry to burst your bubble, but no this will NOT work.  These transformers
can't put up with that kind of voltage.  These transformers are also far too
small to provide a usable amount of power.

On Mon, Mar 23, 2009 at 19:53, Leonidas Tolias <ltolias@xxxxxxxxxxx> wrote:

> I had a few of those big black "Wall Wart" transformers lying around.  i
> pulled some apart and noticed that they have some nice looking
transformers
> inside them.  The transformers have EE cores, with the cores made of
> interlocking metal Es.  the primary and secondary are wound side by side,
> not primary on top of secondary, or vice versa.  Some have center taps on
> the original secondaries (which we would use as primaries).  By running
them
> in the reverse of their normal configuration, and possibly removing
several
> winding from the primaries (seems like an easy way to make the turn ratio
> larger), would it be possible to use them in tesla coils? this would make
> transformers basically free, and i would hate to keep buying NSTs and
OBITs
> if there were such an easy cheap
> alternative._______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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