Re[2]: NST Filter and Circuit Configuration?

• To: tesla-at-pupman-dot-com
• Subject: Re[2]: NST Filter and Circuit Configuration?
• From: Aric_C_Rothman-at-email.whirlpool-dot-com (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Wed, 16 Dec 1998 12:05:02 -0700
• Approved: twf-at-verinet-dot-com

For my NST filter, I made 250pF caps by stringing four 1000pF/10kV ceramic
caps 
in series and potting them in Bondo polyester resin.  I haven't tried them
out 
yet, but I expect the potting will eliminate any arcing risk (assuming I
didn't 
jumble up the cap leads during the potting process).  The filter uses two
such 
cap assemblies; with a cap going from one of the NST secondaries to ground.  
Series 5k/120 Watt resistors and a safety gap complete the filter circuit.

Aric

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Subject: Re: NST Filter and Circuit Configuration? 
Author:  Tesla List <tesla-at-pupman-dot-com> at Internet
Date:    12/16/98 2:02 AM


Original Poster: Travis Tabbal <bigboss-at-inquo-dot-net> 
     
Thanks for the comments Terry. I had located one you listed has having 
good filtering capabilities, however, the new circuit you refferenced 
seems a better choice.
     
In regard to the ohmite resistors you mentioned. Digi-key only lists low 
values for them. 500 ohm seems the highest, your circuit recomended 5k. 
They also list them as wirewound. Am I missing something? 
     
Do the capicitors need to be anything special? I found some at a local 
supply that are rated at .02 mfd 15KV and 47pf 25KV. The first is a small 
white tube and the later looks like a ceramic disc. That's about it for 
high voltage stuff. The ceramic disc looks like the leads are close enough 
to arc though.. Do you have a source for either part? 
     
Travis
     
     

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