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Re: [TCML] Pole Pig Cap
Once again, the Maxwell datasheet for the Model 37667 cap (.03uF @ 35kV) shows a 500 PPS rating.
--- On Sun, 6/7/09, DC Cox <resonance@xxxxxxxxxxxx> wrote:
From: DC Cox <resonance@xxxxxxxxxxxx>
Subject: Re: [TCML] Pole Pig Cap
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Sunday, June 7, 2009, 7:16 PM
The pulse rate of the 35 kV Maxwells is usually around 2-3 pps, not high
enough for the 400 ppps a large coil operates best at.
The 10 AWG is not large enough. The xmfr hits peaks drawing approx 7-8
times the average current value. You should use
6 AWG at 60-70 Amps over it will over heat. Ask me how I know this ---
non synchro around 400 pps is the best way for large sparks.
On Sun, Jun 7, 2009 at 3:41 PM, Tyler Pauly <rpggod714@xxxxxxxxx> wrote:
> I'm still brainstorming on my choice of tank cap for my 10 kVA pig. The
> goal was to run it around 12-14 kVA by means of 240V 50-60A. It will be
> limited by a ballast inductor of 10 gauge wire wound around a PVC form with
> individually insulated welding rods inside. I will soon be testing the
> ballast to see if the 10 gauge can take short run times without going up in
> As to the capacitor choice, I'd love to go with one of DC's .1 mfd 80kV
> caps but I just can't afford one at the moment. I looked at the standard
> 37667 Maxwells but I don't think I'm comfortable with running single cap
> strings, as the 35 kV rating just isn't high enough for comfort, unless
> someone else has run w/o problems? MMC's seem to be out of the question as
> well, unless there is some cap I haven't yet found.
> However, all of the above thought process was assuming trying to get
> I recently came upon documentation of STR caps. I was scanning the archive
> for STR caps with pole pigs, and I can't really find much. What is the
> consensus on having a STR cap? I was hoping for something around .04-.05
> mfd. Cres looks to be .092 mfd for 60A input and .0767 mfd for 50A.
> However, these C values don't take into account the L of my ballast, which
> seems to be important. I don't know how to do this...
> What I could find on STR's usually associated them with ARSG's; why is
> that? I had planned on using a RSG.
> If STR's are an accepted cap choice, this would really help cut costs;
> since I'm still technically a poor college student, I can't really drop 750
> dollars on capacitors.
> Thanks guys for all the help.
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