RE: Good cheap large caps?

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

Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>

There may be a false economy in just looking at the highest joules/$ for a
component cap.  Using .33/1600V caps, a string of 13 will give you a nice
.025/20.1kV MMC.  But if you are using a smaller NST and you're shooting
for a .006uF cap, you'd have to string together 55 .33/1600's.  True, your
cap would be rated at 88kV, but this is just a waste of caps.

A .006uF cap could alternately be made of 25 .15/2000 caps.  It too would
be over-rated voltage wise (50kV), but would use fewer caps. 

Or, a .006uF cap could be made of ten .056/2000 caps, resulting in a
.0056/20kV MMC.

What costs less:
55 .33/1600 caps,
25 .15/2000 caps, or
10 .056/2000 caps?

I also am uncomfortable with the thought of using just a single string of
caps, as the entire primary current must be carried by every cap.  Better
to use multiple strings of smaller caps, dividing the current so many ways.
 But I've not gone through the numbers to prove that this is a problem.

Gary Lau
MA, USA

 -----Original Message-----
From: 	Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent:	Thursday, June 13, 2002 1:44 PM
To:	tesla-at-pupman-dot-com
Subject:	Re: Good cheap large caps?

Original poster: "Christopher Boden by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <chrisboden-at-hotmail-dot-com>

I'd like to know which really is the better buy, if there is a signifigant 
interest I can get the 942C16P33K, and I can sell them for $2.50 each 
(that's what they cost from the factory). I can get 238pcs within a week if 
there's enough interest. Someone organise a Bulk-Buy and I'll supply them to 
you. Though, after all the work we've done for the .15's I still believe 
that the .15uF cap is a better buy. Someone show me HARD FACTUAL NUMBERS 
proving which cap is best, then I'll see if we add the new one or not.





Christopher "Duck" Boden Geek#1
President / C.E.O. / Alpha Geek
The Geek Group
www.thegeekgroup-dot-org
Because the Geek shall inherit the Earth!

>Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><tesla-at-paradise-dot-net.nz>
>
>The CDE 942C16P33K 0.33uF 1600v is pretty good
>(CDE = Cornell Dubilier Electronics)
>
>My current order from Richardson Electronics is USD$2.68/each for an order
>of 27
>
>This is the best $/nF/kv with very high pk I and dv/dt that I can find and 
>I
>believe it to be a MUCH better buy than Geek Caps 942C20P15K (2000v/0.15uF)
>For the slightly smaller V rating and higher Ipk the extra few caps per
>string are more than paid for by the DOUBLE capacitance size
>
>Food for thought, If someone disagrees luv to hear from you with reasoning
>Best to list
>Ted L in NZ


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