Re: Awesome Quarter Shrinking Capacitors on EBAY

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

Original poster: John <fireba8104-at-yahoo-dot-com> 

Hello,
This capacitor is not a electrolytic or a cap bank.
It is in an oil filled metal can with large white ceramic insulators.
I am not sure what kind of dielectric, but I believe it to be a type of 
plastic.
The exact wording on the side of the cap reads as follows:
KN128
4MFD
4000VAC
I was unsure as to weather this was Milli or Micro. My hopes were confirmed 
when I asked the man who gave it to me, a professional electrical 
engineer.(0.004). I think it's from 
<http://www.plasticcapacitors-dot-com/>http://www.plasticcapacitors-dot-com, after 
all he is a customer.
Cheers,
John

Tesla list <tesla-at-pupman-dot-com> wrote:
Original poster: "Jim Lux"

Indeed.. you're right, I missed the missing u... But, then, a 4000 uF cap at
4kVAC rating.. Hmmm. maybe in the form factor cited, but not going to be a
high current device. Almost certainly a stack of electrolytics, which then
casts doubt on the VAC rating, as opposed to VDC...
Say, then, two 8000 uF 4kV DC electrolytics in series? I've got some
250,000 uF 400 V electrolytics in a form factor comparable to what's
quoted.. But, to get 4 kV, means 10 in series, for 25 uF... For 4kV AC,
that's 12 uF, and would be a LOT bigger than a Simpson, but, not orders of
magnitude.


I think though, that we could agree that this is NOT something with high
pulse current capability.


----- Original Message -----
From: "Tesla list"
To:
Sent: Fri! day, October 03, 2003 8:35 PM
Subject: Re: Awesome Quarter Shrinking Capacitors on EBAY


 > Original poster: Mddeming-at-aol-dot-com
 >
 > In a message dated 10/3/03 6:42:16 PM Eastern Daylight Time,
 > tesla-at-pupman-dot-com writes:
 > Original poster: Jim Lux
 >
 > At 03:47 PM 10/3/2003 -0600, you wrote:
 > >Original poster: John
 > >I have a 0.004F cap rated at 4000VAC (32,000 jolues) that is only a bit
 > >smaller than my simpson 260 multimeter.
 >
 > That's 32 millijoules, not 32kJ... .004 * 4*4/2 = 32E-3...
 >
 > Look again. he said 0.004F NOT .004 uF! If he's right, your calculation is
 > off by 10e6
 >
 > Matt D.
 >