Re: Newark ebay capacitor: primary tank capacitor?

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

Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com> 

With doorknob types, it's hit or miss. The ones that are not rated for rf
will overheat and die. Not sure if there is a way to tell just by looking at
them. Usually I've seen a seen a dozen or so 30-40kv ones in parallel to get
the capacitance needed. Considering the cost of that (~$10-20 each), better
off getting 942c's where you know what you are getting.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, February 24, 2004 11:22 PM
Subject: Re: Newark ebay capacitor: primary tank capacitor?


 > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 >
 > Alright ,what about these caps:
 >
 > http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=2597981535
 >
 > sry if I'm being annoying.
 >
 > ---Eric
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, February 24, 2004 5:51 PM
 > Subject: Re: Newark ebay capacitor: primary tank capacitor?
 >
 >
 >  > Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
 >  >
 >  > Tesla list wrote:
 >  > >Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 >  >
 >
 >http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=2597989262&category=4662
 >  > >could that capacitor(in series obviously) handle the stresses of
primary
 >  > >tank capacitor duties? Also, can some1 point me to reference so I can
 >  > >convert uf to nf, pf and uf, and so on? I know 10^-9 is nano and 10^-6
is
 >  > >micro but that doesnt mean much to a mid class geometry student.
 >  > >
 >  > >.
 >  >
 >  > Dear (what's your name?),
 >  >
 >  > These caps are Mylar. Because they are very lossy under RF use and the
 >  > package does not allow for "graceful" expansion, they tend to become
oily
 >  > firecrackers when used in Tesla Coil tank circuits. They are usable
only
 > as
 >  > DC filter caps, in voltage doubler circuits, or in low pulse rate
(non-RF)
 >  > applications.  :^(
 >  >
 >  > 1 uF = 1,000 nF = 1,000,000 pF
 >  > 1 nF = 0.001 uF = 1,000 pF
 >  > 1 pF = 0.001 nF = 0.000001 uF
 >  >
 >  > These caps are 0.25 uF = 250 nF = 250,000 pF
 >  >
 >  > Best regards,
 >  >
 >  > -- Bert --
 >  > --
 >  >
 >  >
 >  >