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Re: Terry filter alternates?

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

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.

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 ;-)

Cheers,

        Terry