[TCML] Terry Filter

[Dan Casaregola]

NST is Gardner.  Ok on 8 mov's per side for 15kv/30ma.  Was not aware that 
cap size was critical (rc resonance) .  i haven't purchased the caps yet, 
but I do have .01 @ 2500 wv micas, and was hoping to use them. I guess I'll 
have to calculate the original resonance freq, then see how many .01 I would 
need and hope the total voltage will be adequate.  Thanks for help.
----- Original Message ----- 
From: "Lau, Gary" <Gary.Lau at hp.com>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
Sent: Friday, November 06, 2009 4:37 AM
Subject: RE: [TCML] Terry Filter


What kind of NST are you using?  For a 15kV NST, only -8- MOV's should be 
used per side.  See http://www.classictesla.com/download/NST_Filter.jpg

The number of MOV's used must change as the NST voltage changes, since the 
number determines the clamp voltage.

While the number of caps could be varied to maybe save a few pennies when 
using a lower voltage NST, the cap uF rating would need to be increased, as 
you always want the resulting string to have the same capacitance, so that 
the R-C filter will have the same high frequency cutoff characteristics.  So 
don't change the caps.

Regards, Gary Lau
MA, USA




> -----Original Message-----
> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
> Behalf Of Paul Brodie
> Sent: Friday, November 06, 2009 1:02 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Terry Filter
>
> My drawing shows 9 MOV's on each side. Why the discrepancy?
> Paul
> Think Positive
>
> ----- Original Message -----
> From: "Dan Casaregola" <ag2z at comcast.net>
> To: <tesla at pupman.com>
> Sent: Thursday, November 05, 2009 6:38 PM
> Subject: [TCML] Terry Filter
>
>
> I'm in the process of building a filter for my 15k/30ma NST, and the 
> drawing
> I have shows the number of MOVs required for the stated voltage, but it 
> only
> shows 6 MOV. either side of center tap ground.  I remember reading 
> somewhere
> that the number of caps should be the same as the number ov MOVs.  Is this
> correct?  Thank you  Dan

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