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Re: small coil
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.
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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