Re: mmc questions

[Terry Fritz <twftesla-at-uswest-dot-net>]

Hi Jeremiah,

	We use high current or pulse rated polypropylene caps.  2000V at around
50-100nF is about right.  They are usually a bit pricey.  Practically any
other common commercial cap will quickly if not instantly burn up from the
high frequency current.  I am not familiar with the Radio Shack caps you
mention but the values seem impossible.  I don't know of any Radio Shack
caps that would work for a coil. 

The resonant size for 12/30 is 6.63nF.
For a static gap, a nice LTR size is around 11nF.  Maybe a bit more.
For a sync rotary gap LTR you can go to 17nF.

The current is reasonably high so you should have 3 or more strings of good
poly caps in an MMC.  The simple program at:

http://users.better-dot-org/tfritz/MMCPower4.html
http://users.better-dot-org/tfritz/site/programs/MMCCALC2.ZIP

Can help with the selection.

Cheers,

	Terry



At 11:19 AM 8/21/00 -0500, you wrote:
>i was wondering.  What kind of capacitors work well.  I have a bunch of 6kv
>222mF capacitors from radio shack lying around and i wanted to know if
>those were useable.  If i have a 12/30mA nst what rating should the mmc be
>when i am finished.  Any help is well appreciated
>Jeremiah
>
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