Re: A reVOLTing development.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Hi Chris,

You need to decide for your self how you want to do 16.7 nf.  I used one
string of 14 - 0.1uf and two strings of 14 - 0.068uf.  If you go larger than
16.7 nf, the voltage may not reach the expected potential (energy per bang
may go down) and the BPS will drop.  16.7 nf is based on 120 BPS with SG set
to rated output voltage.  Smaller than 16.7 nf could result in overvoltage
of the NST (if safeties and main gap not set correctly) or larger than 120
BPS (SG losses will go up).

If you are stuck with 0.15 caps then you could build two strings of 18 and
be able to handle 800amps peak. or if you don't mind runing the risk you
could build one string of 9 that would be good for 400amps peak and hope
they don't breakdown.  Lot of options available depending on how much you
want to spend.

Gerry R.

 > Original poster: "Christopher 'CajunCoiler' Mayeux" <cajuncoiler-at-cox-dot-net>
 >
 > And therein lies the rub.  These are the CDE 942C20P15K
 > caps that are so popular around here. (2kv)
 >
 > So, if I'm thinking correctly, (correct me if I'm wrong),
 > the next best setting would be 10.7143nF (1 string of
 > 14), with primary tapped 13-14 turns...a 2.41 joule bang.
 > Or would this exceed the charging capability of the NST's?
 >
 >  > -----Original Message-----
 >  > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >  > Sent: Wednesday, August 04, 2004 8:28 AM
 >  > To: tesla-at-pupman-dot-com
 >  > Subject: Re: A reVOLTing development.
 >  >
 >  >
 >  > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >  >
 >  >
 >  >
 >  >  > Original poster: "Christopher 'CajunCoiler' Mayeux"
 >  > <cajuncoiler-at-cox-dot-net>
 >  >  >
 >  >  >
 >  >  > So if I were to go with a 16.67nf MMC
 >  >  > (9x.15uF), re-tapping the primary at
 >  >  > 10-11 turns, I should be back in tune,
 >  >  > with a 3.75 joule bang... as opposed
 >  >  > to the original 8.82nF MMC with 1.98
 >  >  > joule bangs.  Or am I off the mark again?
 >  >
 >  > Yes on the 16.7 nf, but be careful on the string of 9.  Nine is
 >  > OK, I think,
 >  > if each is rated at 3KVdc.   I use strings of 14 - 2KVdc caps and I
feel
 >  > comfortable with that for a 15KVrms transformer (over 21KVpeak).  You
will
 >  > find different opinions on voltage ratings amonst the group.  Also
don't
 >  > exceed the peak current rating of the cap.  Total peak current
 >  > (assuming no
 >  > losses) will be:
 >  >
 >  > Imax = Vmax / sqrt (Lp/Cp)
 >  >
 >  > This current will split between the number of strings either
 >  > equally (if all
 >  > strings are alike) or unequally if the string capacitance differs
between
 >  > strings.  For example, the current thru string 1 (of 3) strings will
be:
 >  >
 >  > Ipeak_1 = Imax * C1/(C1+C2+C3)
 >  >
 >  > Gerry R.
 >  >  >
 >  >  >
 >  >  >
 >  >  >  > -----Original Message-----
 >  >  >  > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >  >  >  > Sent: Monday, August 02, 2004 9:31 PM
 >  >  >  > To: tesla-at-pupman-dot-com
 >  >  >  > Subject: Re: A reVOLTing development.
 >  >  >  >
 >  >  >  >
 >  >  >  > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >  >  >  >
 >  >  >  > Hi Chris,
 >  >  >  >
 >  >  >  > Cres = 10.6 nf
 >  >  >  > Cp for static gaps = 17 nf
 >  >  >  > Cp for SRSG = 30 nf
 >  >  >  >
 >  >  >  > Gerry R.
 >  >  >  >
 >  >  >  >
 >  >  >  >  > Original poster: "Christopher 'CajunCoiler' Mayeux"
 >  >  >  > <cajuncoiler-at-cox-dot-net>
 >  >  >  >  >
 >  >  >  >  > I'm using a pair of 15/30 NST's, paralleled.
 >  >  >  >  > So my limit would be????????
 >  >  >  >  >
 >  >  >  >
 >  >  >  >
 >  >  >
 >  >  >
 >  >
 >  >
 >
 >