Re: NST protection filter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

There is no great math behind the filter's cutoff 
frequency.  It is not critical at all.  The 
values are mostly from how much power one want's 
to "waist" in the resistors and what cap size 
will not greatly interfere with the primary circuit.

Cheers,

        Terry


At 06:28 PM 1/3/2006, you wrote:
> I've learned my lesson and am in the proscess of
> adding a "Terry Filter" to my coil, along the lines of
> the one at
>
> http://www.hot-streamer.com/temp/NSTFilt.jpg
>
> If I did the math correctly, it has a cut-off
> frequency of approximately 290KHz.  I assume that the
> frequency response is adjusted up or down based upon
> the resonant frequencey of the coil?  Is there a
> discusstion/web page somewhere along these lines?
> Doing a web search find a lot of hits but none
> specifically describing the filter and it's
> application for different frequencies.
>
> Seeking advice...
>
> Thanks,
>
> Curt.
>
>
>
>
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