Re: first post (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 16 Aug 2007 07:49:08 -0500
From: Terri Neeley <neeley_111@xxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: first post (fwd)


Dang now im confused.  What value should i go for my cap.  My
transformers output approx.9kV225mA.

Garry Neeley

________________________________________________________________________________

      From:  "Tesla list" <tesla@xxxxxxxxxx>
      To:  tesla@xxxxxxxxxx
      Subject:  Re: first post (fwd)
      Date:  Thu, 16 Aug 2007 06:10:13 -0600 (MDT)
      >
      >---------- Forwarded message ----------
      >Date: Wed, 15 Aug 2007 18:41:30 -0700
      >From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
      >To: Tesla list <tesla@xxxxxxxxxx>
      >Subject: Re: first post (fwd)
      >
      >Hi Garry,
      >
      >I understand the transformer hookup but I don't understand
      your target
      >capacitance. You mentioned 0.066uF. This is the "resonant"
      capacitance
      >value that will cause the transformer to operate in a 100%
      resonant
      >charging mode. Are you sure you want to do this? Can be a
      very bad thing
      >for your transformers. Even giant pole pig coils usually run
      smaller
      >than resonant by some margin. And NST's typically run larger
      than
      >resonant by some margin. The idea is to stay away from the
      resonant cap
      >value unless you design your components to take advantage of
      resonant
      >charging. That means large safety margins in the voltage
      category of the
      >cap chosen and the windings voltage standoff capability of
      the transformer.
      >
      >I was kind of surprised no one else had mentioned this
      issue. Your cap
      >would do just fine in the 0.02 to 0.04 uF range. Good for
      MMC with
      >regards to the number of caps vs. voltage and current
      ratings.
      >
      >Examples:
      >2 strings of 14 caps per string (CD 0.15uF type) [28 caps)
      >= 0.0214uF total capacitance at 28KV rating (rms derating of
      3.1)
      >
      >3 strings of 10 caps per string (CD 0.15uF type) [30 caps]
      >= 0.045uF total capacitance at 20KV rating (rms derating of
      2.2)
      >
      >Where:
      >4 strings of 10 caps per string (CD 0.15uF type) [40 caps]
      >= 0.06uF total capacitance at 20KV rating (rms derating of
      2.2)
      >
      >Just food for thought. The 0.06uF value is unnecessary,
      problematic,
      >component dangerous, and expensive.
      >
      >Take care,
      >Bart
      >
      >
      >
      >
      >Tesla list wrote:
      >
      > >---------- Forwarded message ----------
      > >Date: Wed, 15 Aug 2007 07:34:54 -0500
      > >From: Terri Neeley <neeley_111@xxxxxxx>
      > >To: tesla@xxxxxxxxxx
      > >Subject: first post
      > >
      > >Hey guys im new to coiling but I am building my second
      coil and I need some
      > >help.  I don't want to make the same costly mistakes as I
      did on the first
      > >coil.  I will have 2 ge 5021g10 wired for 9000v 225ma for
      a spark gap coil.  My
      > >question is:  What capacitors should i go with?  I need
      .06microfarad so I
      > >thought about the maxwell you see floating around ebay?  2
      in parallel of the
      > >35k .03mF would work but would it survive?  Any
      suggestions would be great Thx
      > >in advance.
      > >Garry Neeley
      > >
      >>______________________________________________________________________________
      ________
      > >
      > >Find a local pizza place, movie theater, and more�.then
      map the best route!
      > >
      > >
      > >
      > >
      > >
      > >
      > >
      >
      >
      >


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