RE: special disk capacitor question

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-uswest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Shaun

If the caps are from a big X-ray power supply, I would think that they could
handle the current output from a neon sign transformer. The currents
produced by big X-ray supplies are in the hundreds of milliamperes. The
biggest neon sign transformer I have is 15KV/120MA, and I don't expect to
ever find another. However if the caps are from a small dental X-ray unit,
you may have to parallel some of the caps. The current in a small dental
unit is less than 30MA. I just don't think that you would find 16 caps in
tubehead, so your X-ray power supply must be large. 

Godfrey Loudner


> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Thursday, April 12, 2001 6:21 PM
> To:	tesla-at-pupman-dot-com
> Subject:	special disk capacitor question
> 
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <biomed-at-miseri.winnipeg.mb.ca>
> 
> Hello coilers!   Help!
> 
> I need some advice from you more experienced builders.
> 
> I have got my hands on a bunch(16) of high voltage (30kv) capacitors.
> They are from a power supply of an x-ray generator.  It is immersed in oil
> and cased in a large metal box.  All 16 of them are soldered to a cockroft
> walton (I think thats how it's spelled) voltage multiplier board.   They
> are 1-1/8  inch round and 3/8 inch thick with the leads comming out from
> each side.
> 
> The labeling is  152M
>           TDK
> 
> 1.5 nF  * 16 caps =  24nF        if all paralleled             and I can
> remove  any number for smaller values
> 
> 
> Question:   I know I've read that small disk caps can't handle the surge
> currents of a tesla coil when used in an MMC, but that is series \
> parallel
> configuration.  I maybe able to run these in parallel only.  Would these
> BIG disk caps be any good for a neon sign powered tesla coil.        I
> hope
> they are but what do you think!.
> 
> Also there are 20 diodes  all hv on the same board,  2 stepup
> transformers,
> 4 - 200 Mohm resistors and other stuff, cool hey!
> 
> I welcome all comments and thanks for your help in advance !
> 
> Shaun Epp
> Winnipeg, Manitoba
> Canada
> 
> 
>