Re: [TCML] Terry Filter

["Dan Casaregola" <ag2z@xxxxxxxxxxx>]

Thank you for the advice.  Good thinking.  I don't think I'll be cranking up 
the variac beyond the line voltage.  Too much sparks!  Small garage. 
Anyway, I was used to 9kv/30 ma, and 14 inch sparks to ground.
----- Original Message ----- 
From: "Quarkster" <quarkster@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, November 06, 2009 11:26 AM
Subject: Re: [TCML] Terry Filter


> Dan -
>
> You need to carefully review the manufacturer's datasheet for your 
> specific MOVs to verify their rated RMS voltage, and compare this to what 
> you expect to see in your circuit. You also need to consider if you ever 
> intend to "overdrive" the NST with a variac (apply more than local AC line 
> voltage) to achieve greater coil output. If so, you might want to 
> "design-in" physical space for additional MOVs, and just use  jumper wires 
> at these locations until you are ready to increase NST input voltage.
>
> Some useful technical data on MOV characteristics can be found at:
> www.littelfuse.co.kr/data/en/Application_Notes/an9767.pdf
>
> Regards,
> Herr Zapp
> ----- Original Message ----- 
> From: "Dan Casaregola" <ag2z@xxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Friday, November 06, 2009 9:24 AM
> Subject: Re: [TCML] Terry Filter
>
>
> > I have no idea.  The legend on my drawing shows 12 movs for a 9kv nst,14 
> > movs for a 12kv ;nst, and 16movs for a 15kv nst.  I can only assume that 
> > your drawing would provide a greater safety factor.
> > ----- Original Message ----- 
> > From: "Paul Brodie" <pbbrodie@xxxxxxxxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Sent: Thursday, November 05, 2009 10:01 PM
> > 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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>
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