RE: [TCML] Terry Filter

["Lau, Gary" <Gary.Lau@xxxxxx>]

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@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] 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@xxxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> 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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