[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: option 1 or option 2.....

Original poster: "seanick" <edgarsbat@xxxxxxxxxxx>

I disagree with the statement that 940C's don't survive moderate use. They aren't as good as 942C's, sure, but I have 4 strands of 10 3Kv .1uF 940c's that have withstood a couple years so far. That includes many times when the coil was misconfigured (most of the time? ) which is worse on the caps than running perfectly tuned, if I am not mistaken. I have potted them in 2.5"x2.5"x8" bricks of epoxy too which was dumb and I wouldn't do it again - the caps have no way to dissipate heat, not to mention I have no way to tell if one of them is failed aside from a drop in capacitance. So far they haven't changed any though. Today I am officially replacing them with 2 Maxwell 37667's but if the pulse caps end up being bunk I will go back to the MMCs as they still work fine for my use - I only have a 10 KVA, 13800V pig, with a 6KW welder ballast though so if you are using higher voltage or wattage then the caps may be more at risk.

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, November 07, 2005 9:42 PM
Subject: Re: option 1 or option 2.....


Original poster: Rich Simpson <richcreations@xxxxxxxxx>

you want to use the 942c series, the 940c series will not survive
tesla coil duty.
-Rich
On Nov 7, 2005, at 3:58 PM, Tesla list wrote:

Original poster: "Langer Giv'r" <transworldsnowboarding19@xxxxxxxxxxx>

Hi again, since i am using ALL my money to buy caps i need to
choose wisely...  which one would you guys recommend: (i am using a
10KV 23mA OBIT by the way = 6.1nF resonance)

Option one:  5984-940C30S1K-F Cornell Dubilier 3KVDC 0.01uF  5
strings of 8 pcs each:
                                       40 caps for total of 6.25nF.
(x50) 1.23 each for total of $61.50

Option two:  5984-940C30S47K-F Cornell Dubilier 3KVDC 0.047  2
strings of 12 pcs each:
                                      24 caps for total of 7.8nF.
(x25) 2.00 each for total of $50.00

or should i just scrap both those options and go for far larger
than resonance?  i am of a strictly tight budget.  thanks for all
the help and hopefully i will finish my first coil within the 6
months ive been working on it.

p.s.  why is the voltage of the entire MMC (3KV * 8 = 24000  /   5
strings = 4800V??) only 4800 volts when the peak voltage of the
xfrm is 14140V?
thanks