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Re: [TCML] "Wall Wart" Transformers



Hey Leonidas...

your theory seems plausable but in reality it wont work. There are several things working against this senario. Reversing the inputs to a 120 to 12 volt trannie will overheat the windings on the reverse side due to the thin wire used to make the trannie. Basically, the reverse winding idea will act as a short circuit and melt the wires.

Second thing working against you.... the core of the trannie is very small compared to an NST, the required magnetic flux needs a pathway large enuf to move thru to maintain a "stable" flow, the core size also determines how much flow can be transfered to the windings to supply the needed power on the transformed voltage side.

3rd thing not in the favor of the theory... the number of windings of the primary side compared to the secondary side ( nst) need to be basically 1 to 100... unfortunately, wall transformers are 10 to 1 thus 120 in 12 out nsts are 120 in 12000 out reversing a wall transfomer will " give" 1200V out if it were possible... also, the number of windings on the 120 volt side are usually 200 or so turns due to wire resistance required to keep the 120 volts from seeing the wire as a direct short or low resistant load... the lower the resistance, the more current can flow thru the length of wire thus causing quicker heating of the wire and then smoke....

I know this is a crude way of stating this application but it seems to work when a quick explination is required...

Hope it helps...

Scot D


Leonidas Tolias 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. _______________________________________________
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