Simple to build isolation transformer that consumes less power than it gives out

[e-]

Thanks for joining in.  I think the difference - at least in Jack's initial circuit is that he has 2 separate cores whereas the autotransformer you show has just one core.   Your idea of using 2 MOT's sounds interesting.  I'm visualizing an easy way of just joining the cores mechanically (and electrically) but using only the only the HV windings on each thus giving a 1:1 if they are the same type.  Not sure if that would work but it came to mind.  I've got a lot of MOT's laying around so I might give that a try.

Ok, but Jack says he is only using one transformer and it works.

I thought about removing the HV coil of a MOT and fit in the other, but do not know if I can because the resin used to glue. I would like some opinion on how to remove the resin.

Another way would be to remove only the laminations "I" of the two MOTs and fit it all formed a single nucleus with the two parties "E" without having to remove any coil.

[Jack Noskills]

I have tested E-E and it works fine too so it is better to use that instead of totally ruining the MOT. You can use one coil from each side, leave the others unconnected so they have no effect. You can use those for probing voltages when system is live. Don't know how a MOT looks like, start with finer grade wire first if there is difference in wire gauge.

[penno64]

Hi Jack,

I would like to have a go at replicating.

Access to quite a few MOTs and a variac.

For other experiments, I have removed the top layer of transformer steel and retained what would
appear to be an E core with the both the heavy and light gauge windings.

If I am understanding correctly, you are suggesting to get 4 of the high resistance (finer gauge wire) and
set two of these on a core. Make a second then, use the two pairs to create your one to one twin transformers.

Hope I am on the right track.

Pics to follow soon.

Penno

[Jack Noskills]

You can start with just one trafo.
Very first test is to put one coil via some bulbs, if they light up very bright then it most likely does not make sense to continue. Unless you have access to high frequency AC source, then things should become interesting. If you put two coils and measure this idle power flowing and you get below 10 watts, then there might be a chance. In my tests idle power of one 400 meter coil was 134 watts, but with 2 coils it was less than 1 watt. So it worked but it could have been much more powerfull if the idle power would have been one watt with just 400 meter coil.

Thank you for giving this a try.

[penno64]

Hi Jack,

Thanks for the reply.

To be sure, are you suggesting two high impedance (100 ohm) identical coils on the same
"E" core?


Penno