RE: Determine initial LTR cap size. was Best cap size for a sync gap

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

Original poster: "Cody Carse" <cac619-at-earthlink-dot-net> 

What exactly is the LTR value of a cap? I understand for a static gap system
it is pi/2 * the resonant cap size, but why. Also why should we use it?

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, April 30, 2004 9:42 PM
To: tesla-at-pupman-dot-com
Subject: RE: Determine initial LTR cap size. was Best cap size for a sync
gap

Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

Hi Daniel,

Let me see if I can remember ;-))

Originally, LTR values were computed with long hard MicroSim simulations:

http://hot-streamer-dot-com/TeslaCoils/Misc/NSTStudy/NSTStudy.htm

The equations for MMC also were known:

http://hot-streamer-dot-com/TeslaCoils/MMCInfo/MMCPower4.html

These were combined into the program here:

http://hot-streamer-dot-com/TeslaCoils/programs/Mmccalc2.zip

A modern Excel version is here:

http://hot-streamer-dot-com/temp/MMCcalc2.xls

These two programs were used by Mark Broker to make the GeekGroup chart
that everyone goes by now.

Eventually the equations were justified:

http://www.pupman-dot-com/listarchives/2002/April/msg00038.html

Cheers,

          Terry






At 05:44 PM 4/30/2004, you wrote:

 >Apologies if my question has been posed previously. (It probably has been
 >several times in years past);
 >
 >How do you compute the LTR cap value for a given transformer with a static
 >gap? SRSG?
 >
 >I see that the Geek Group website has a table for a given range of NST
 >sizes but what I'm after is the formula(s) to determine the recommended
 >LTR cap value for a given transformer. I know how to determine the
 >resonate cap value for a given neon but how do I arrive at LTR?
 >
 >I realize that the very nature of this thread suggests that the optimum
 >LTR value might be up in the air...
 >
 >Daniel