Re: Protecting Small Transformers

• To: tesla-at-pupman-dot-com
• Subject: Re: Protecting Small Transformers
• From: FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 24 Apr 2000 12:39:07 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 4/24/00 10:42:21 AM Pacific Daylight Time, 
tesla-at-pupman-dot-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

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