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Re: Protecting Small Transformers
In a message dated 4/24/00 10:42:21 AM Pacific Daylight Time,
tesla@pupman.com writes:
>
> 2ndly since i am using two transformers in paralell is there some way of
> making
> sure the load is spread evenly (only one blows at a time) or should i just
> give
> up and start looking (harder) for a NST?!
>
> Thanks very much
>
> Alex
Alex,
Welcome to the list.
I would say that usually the RF will kill the outer turns of the secondary,
or it may cause carbon tracking. OBITS are very fragile but a protective
network may help.
I once built a small single OBIT powered TC using a simple 4 section
static gap using silver electrodes, and a 0.015uF mica cap.
The primary had about 20 turns
of coax cable, and the secondary was 3" by 12" wound with #28 wire.
The coil was topped by a small 1.5" by 4.5" toroid. The coil gave 13"
sparks max. The OBIT was 10kV, 23ma rated. I didn't use any
safely gaps nor any protective networks, and I didn't have any failures.
I think the small cap size helped to save the OBIT from destruction.
Cheers,
John Freau