Re: Newark ebay capacitor: primary tank capacitor?

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

Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

yes, I intend to ballast the 4 pack MOT severely, I am going with it because
it seems cheaper and more dependable than NSTs and I ballast it down for
smaller coils but still have a psu capable of handling the big ones. Can I
use my clamp meter to measure the secondary current?

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, February 26, 2004 9:01 AM
Subject: Re: Newark ebay capacitor: primary tank capacitor?


 > Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com>
 >
 > The 10 kv ones? Usually doorknobs are rated dc or dc peak volts. For 4
mots
 > (~8kvac) you would need at least 24 kvdc worth. And mots put out about
 > 300-500 mA. Assuming 500 mA, 60hz, and a LTR static gap (probably a rotary
 > would be needed with that much current), that equals .2487 uF, which would
 > probably mean a single turn primary (or less, which would problem) unless
 > your coil is huge. You would need 3 in series (round up to 30kv), which
cuts
 > the capacitance down to 1100pF x 226 sets these (or less, depends how much
 > you limit the mot current). 678 of these would be very expensive and would
 > be a major pain just to put them all together. It would take 104 (8series
 > x13parallel array) of the 942c's (about $260 worth). Of course it would
take
 > less if you limit the mots more.
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, February 25, 2004 1:24 PM
 > Subject: Re: Newark ebay capacitor: primary tank capacitor?
 >
 >
 >  > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 >  >
 >  > Gah forgot to say, would 10 of the 3300 pf, or 3.3 nF, in paralell be
 >  > suitable for a 3 inch coil with a 4 pack mot supply?
 >  > ----- Original Message -----
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > To: <tesla-at-pupman-dot-com>
 >  > Sent: Wednesday, February 25, 2004 8:27 AM
 >  > Subject: Re: Newark ebay capacitor: primary tank capacitor?
 >  >
 >  >
 >  >  > 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
snip...........