Re: first post (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 15 Aug 2007 13:00:10 -0500
From: Crispy <crispy@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: first post (fwd)

Hmm, by my calculations, you'd only need 7 per string.  The caps are
rated at 150nF, 2kV each, if I recall.  9000Vrms is about 12730V peak.
Divided by 2000V per cap and rounded up comes to 7 caps per string.
This alone is more than the 15nF you want.  If you want exactly 15nF,
you can use one string of 10, and have a healthy voltage margin as well.
On ebay, the ebay store TeslaStuff sells lots of 12 of these caps for
under $50.

Hope this helps,
Chris

On Wed, 2007-08-15 at 11:05 -0600, Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Wed, 15 Aug 2007 12:07:09 -0500
> From: Terri Neeley <neeley_111@xxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Re: first post (fwd)
> 
> 
> Exactly what Mr. Lux said.  Many people have used these transformers with
> success and I thought it could be a cheaper alternative than stacking
> nst's.  The transformers I have are 4500v 450ma btw.  So if you use Jim
> Lux's config you essentially split the current between the two and double
> the voltage.  I will be using a synchronous rotary gap.  My question is
> are there really any alternatives to CD942's?  What about wima fkp1's? 
> They seem to be much cheaper considering the cd's are over 3 bucks a
> piece and I would need 6 strings of 18 of the .015mF for this coil.  I'm
> just very new to this and I really just want a cap or mmc that will be as
> reliable as reasonably expected to be.  Any really good alternatives
> besides the CD's?  There gonna set me back at least 350$ for them.
> 
> Garry Neeley
> 
> ________________________________________________________________________________
> 
>       From:  "Tesla list" <tesla@xxxxxxxxxx>
>       To:  tesla@xxxxxxxxxx
>       Subject:  Re: first post (fwd)
>       Date:  Wed, 15 Aug 2007 10:23:54 -0600 (MDT)
>       >
>       >---------- Forwarded message ----------
>       >Date: Wed, 15 Aug 2007 09:16:18 -0700
>       >From: Jim Lux <jimlux@xxxxxxxxxxxxx>
>       >To: Tesla list <tesla@xxxxxxxxxx>, tesla@xxxxxxxxxx
>       >Subject: Re: first post (fwd)
>       >
>       >At 08:38 AM 8/15/2007, Tesla list wrote:
>       >
>       > >---------- Forwarded message ----------
>       > >Date: Wed, 15 Aug 2007 08:29:08 -0700
>       > >From: huil888 <huil888@xxxxxxxxxxxx>
>       > >To: Tesla list <tesla@xxxxxxxxxx>
>       > >Subject: Re: first post (fwd)
>       > >
>       > >Terri -
>       > >
>       > >First question is about your HV power supply transformers.
>       These are
>       > >nominally rated at 4500 volts RMS, 400ma. I assume that
>       you intend to
>       > >connect them in series to obtain 9KV RMS AC output?
>       Peak-to-peak voltage
>       > >will be about 12.7KV.  Are you sure that the transformer
>       insulation will
>       > >withstand this? One good flashover at this much current
>       may destroy the
>       > >transformers.
>       > >
>       > >How will you limit secondary the current to 225ma?
>       >
>       >I think that the plan is to cascade the two transformers in
>       series,
>       >using the 600V tertiary winding, so the "high" transformer's
>       core is
>       >floated at 4500V.
>       >
>       >These things have a fair amount of leakage inductance, so
>       the output
>       >current is limited.
>       >
>       >
>       >
>       >I built a similar cascade, using 4 transformers: two
>       cascades, with a
>       >center ground, and it's in many respects like a giant NST.
>       >
>       >
>       >
>       >
> 
> 
> ________________________________________________________________________________
> 
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