RE: [TCML] newer tesla coil parts (split Terry filter resistors)

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

I'm not sure I see the value in having the caps & varistors at the midpoint of the resistors.  The R-C filter will only see one half of the resistance, so its low-pass frequency will be twice as high.  The only benefit I see to this is the bypass caps will be cushioned against the discharge current when the safety gaps fire.  But given that this should not be a frequent occurrence, I'm not sure this is worth compromising the R-C filter's cutoff frequency for.

While splitting the 1K between two 500Ohm units is fine, I think it is bad advice to suggest placing the caps at the midpoint.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Jim Mora
> Sent: Tuesday, November 10, 2009 3:30 AM
> To: 'Tesla Coil Mailing List'
> Subject: RE: [TCML] newer tesla coil parts
> 
> Hi DC, All,
> 
> I agree - nice, thoughtful construction! It never even occurred to me split
> the halves.
> We will all look forward to more pictures of our art form at work!
> 
> Jim Mora
> 
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf
> Of DC Cox
> Sent: Monday, November 09, 2009 2:46 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] newer tesla coil parts
> 
> Nice construction work.
> 
> Both Digi-Key and Mouser usually stock them.  I split mine into two 50 watt,
> 500 Ohm resistors putting one ahead and one behind the common varister/cap
> connections.
> 
> D.C. Cox
> 
> 
> 
> 
> On Mon, Nov 9, 2009 at 10:53 AM, Shaun Epp <scepp@xxxxxxx> wrote:
> 
> > Here are some pictures of my new NST filter.  I ordered parts from digikey
> > this time and used the correct values and MOVs( before I was using 3Kohm
> > resistors and door knob caps).  It's built so that I can change from 7
> MOVs
> > per side to 8.  After reading posts on this list, I think I'm going to use
> > all 8 for my 12Kv, 60mA NST because it puts out more that 12Kv at 120V in
> > and I'm using a variac.  I'm using 50 watt resistors for the 1Kohms, I
> can't
> > get ahold of the 100w versions, does anyone on the list have some for
> sale?
> >
> > http://i487.photobucket.com/albums/rr239/growl99/NSTfilterfront.jpg
> >
> > http://i487.photobucket.com/albums/rr239/growl99/NSTfilterback.jpg
> >
> >
> > Question:
> > My capacitor bank is currently on 2 boards and I'm going to make a 3rd
> > board of CD 942 caps (14 caps 0.15uf in series spaced).  What are other
> > coilers using for board to board spacers?, I want to stack them one on top
> > of the other, and legs to keep them off of the floor,  right now I'm using
> > 1/4 inch nylon bolts with heat shrink tubing over them to strengthen them.
> >
> > thanks,
> >
> > Shaun Epp
> >
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