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Re: Terry filter alternates?
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- Subject: Re: Terry filter alternates?
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Fri, 03 Dec 2004 17:38:49 -0700
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Original poster: "Black Moon" <black_moons@xxxxxxxxxxx>
From: "Tesla list" <tesla@xxxxxxxxxx>
Subject: Re: Terry filter alternates?
Date: Thu, 02 Dec 2004 18:20:09 -0700
Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
At 02:47 PM 12/2/2004, you wrote:
Hi, Im intrested in building a filter for my NST, but can't quite get all
the money for the parts...
It is sort of obnoxiously expensive... Had to use common off-the-shelf
parts so anyone could do it...
Im only using a 15kv 30ma NST, so I was wondering if mabey I could:
Remove the movs, use two 10kv to ground caps across the NST, leave safty
gap across the NST, Replace the 100watt resistors with 10watt 1kohm (or
mabey 2 10watt 1kohm in series per side? 2kohm won't be a big deal at 30ma)
The resistors get pretty hot as is. Smaller ones would probably fry. I
would just use safety gaps, but make them well and set them carefully,
that will get you 90% there.
Well thats why I was thinking of adding inductors to reduce the load on the
PS: about what size filter cap should I use for a 15kv 30ma nst?
And possabley an aircore inductor in series with the resistors, Probley
something looking like a pencil with 2 or 3 layers with some insulator
beween em, or mabey all wound back and forth in little sections so each
winding is only next to a winding withing x kv, Any suggestions on value
to shoot for if I do? Operateing freqency is about 400khz for the coil
Forget the inductors, they are useless. Put you effort into a good safety
gap and be happy ;-)
I still think smaller higher value resistors would probley be fine, since
its the ringdown that causes the disipation higher value resistors would
disipate less, 30ma at 4kohm is still only 3.6 watt, and at lower chargeing
current there would be less ringdown events. Any thoughts?