Re: New Maxwell on ebay

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

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

Hi David,

There is no queation an issue of labor.  The safety factor is a religious
issue.  If I were in the business of selling TC's, I would probably tend
toward Dr R. philosophy.  However, building one for myself might be
different.

Gerry  R.


 > Original poster: "David Rieben" <drieben-at-midsouth.rr-dot-com>
 >
 > Gerry,
 >
 > Yes, this is true. As a matter of fact, if you could get them at $2 (very
 > low cost)
 > a piece, that would be 100 of the CD 942 series MMC caps.
 > If you were to go with 10 strings of 10, that would give you a
 > 20 kV -at- .1 uFD cap or if you could somehow secure the .15
 > uFD caps at this price (not likely), then that would give a .15 uFD, .
 > 20 kV cap. However, if you're running a high powered pig driven system,
 > the .1 or .15 uFD would be in the ball-park for the needed capacitance,
 > but the 20 kV rating would probably be a little "thin", at best,
 > for the voltage rating aspect of it. I'm sure Dr. R would agree
 > with me on this as he states that you need a cap DC voltage
 > rating of at least 3x the RMS AC voltage from your transformer,
 > especially with higher powered systems. So, let's see, if
 > you build your MMC with the 3x safety margin and your
 > transformer is a 14,400 volt pig, that means that you would
 > need a minimum MMC total voltage rating of about 43 kV
 > and that's assuming that you're not overdriving the pig w/ 280 volts
 > input. In that case, we're talking about 16,800 volts from the pig
 > and the 3x safety factor places the needed DC rating of the MMC
 > to about 50 kV. So let's see, if we were to just go for a 40 kV,
 > .1 uFD MMC, that would require 400 of the CD 942 caps (20
 > strings of 20) and if we wanted to go for the full safety factor
 > of 50 kV, that would require 625 of the .1 uFD, 2 kV CD 942
 > caps (25 strings of 25)!! Also, the frustration factor of soldering
 > multiple 100s of little capacitors and their accompanying bleeder
 > resistors would need to be considered in addition to the cost factor.
 >
 > I think the bottom line is that the CD 942 caps are the best thing
 > to come along since peanut butter for the majority of us that
 > are building small to medium sized coil systems with spark out-
 > puts generally < 5 ft, but for the serious high powered, pig driven
 > coil systems, the commercial pulse cap route is still the most
 > practical primary capacitor solution. Just MHO :^)
 >
 > David Rieben
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Friday, August 06, 2004 8:41 AM
 > Subject: Re: New Maxwell on ebay
 >
 >
 >  > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >  >
 >  > For $200, one can get a lot of CDE's
 >
 >