Re: small coil

Hi Chris,

> Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com> 
> The insulation in an NST,MOT, or at FIT is much different than a 120/12 
> stepdown. If you try to reverse feed the 120/12 to use it as a step up you 
> will cook it quickly.
> The 12V side can easily handle 120Volts....but when it crosses into the 
> other set of windings, the secondary is probably rated for 600VAC max and 
> will arc out, cough, burn, and die.

The 12V winding cannot handle 120V at all. It has little inductance 
and the magnetizing current would go through the roof.

> If you want a small power supply, try using either a FIT (Furnace Ignition 
> Transformer, also called an OBIT) or possibly a Television Flyback power 
> supply.
> >Original Poster: Raycroft <k.raycroft-at-worldnet.att-dot-net>
> >
> >After building a medium sized TC (450w), I would now like to attempt
> >building a smaller one, and would like to make the transformer, cap, gap
> >and primary to fit in a 6x6x6 box with the secondary coming out of the
> >top.  Is it possible to use a little transformer from an old printer?
> >The reason I ask is that I had an old epson 11" printer that died, and
> >there was a stepdown transformer in there.
> >
> >Big questions:  I assume the transformer is about 120:12 so I would get
> >about 1200v.  I may have to put several in series.  Now, about current.
> >Do I need to limit the current some way, or will it have high enough
> >inductance to limit itself?
> >
> >Most important: Does it seem feasable at all?  I just don't know.  NST's
> >provide enough voltage, current is limited, and are designed to step up,
> >but I have no clue about how hard one can drive a stepdown transformer
> >in the opposite direction.  Any help would be greatly appreciated.
> >
> >Thank you for your time,
> >Jason Raycroft
> >
> >
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