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Re: [TCML] Terry Filter
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@xxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
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@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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