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Re: Iron transformer positioning under the primary experiment

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Scot,

It is not easy to fine the answers you and I seek, but I was able to do it today:

MOT position Rac(Ohm) Lpri (uH) Power Loss (W)

No MOT                          0.14            3.19            0
MOT in worst position                   0.20            3.25            11.76
MOT in expected build position          0.148           3.19            1.57


On a conventional lossy spark gap coil, even a very close MOT in a bad position would not be noticed. We often see coils with transformers and such under the primary. It might be the case that their added losses are not too great. But the open core MOT will reject eddy and sorted turn currents. That is not the case for say a NST cover.



At 05:09 AM 7/6/2006, you wrote:
Still wonder how much voltage/inductance etc. is being absorbed by the core/windings of the transformer..... and if the windings are being effected by the primary ( increased/decreased voltage) and by how much...

Scot D

Tesla list wrote:

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>


For my new little coil, I have to position the big iron MOT "somewhere". So I did some testing that I wrote up here real fast:


Looks like "directly under the primary" is the sweet spot!!