Re: disk capacitors any good ?

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

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <uncadoc-at-juno-dot-com>

Hi Ray, Shaun.  I agree wholeheartedly, the barium titanates work
extremely well if used properly within their voltage ratings.  No
different than the utilization of any other cap type or style.  I use em
at a 3-to-1scale for our uses, but a 4-to1 scale of voltage derating and
stacking will certainly make these hockey pucks last forever and ever in
any kind of a Tesla coil.  And then is the added plus, when you change
your coil parameters or upgrade power, it is a simple matter to stack a
few more of these buggers into your tank circuit with a minimum of work! 
Just screw em into the circuit!    It sure makes fine tuning of the tank
easy when the computer specs are just not quite right for your given
device!   Cause lets face it people, all these computers want to do after
a few entered programs and calculations is crash, anyone disagree????? 
Windows is the best and the worst animal that ever walked the realm of
cyberspace!!!!!!!!!!!!!      Al.      

On Thu, 12 Apr 2001 11:30:57 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "Ray Robidoux by way of Terry Fritz 
> <twftesla-at-uswest-dot-net>" <robidoux-at-basystems-dot-com>
> 
> Hi Shaun,
> 
> What I have found with ceramic caps is that they work
> much better if you derate the working voltage by 4:1.
> This is because with RF these caps tend to heat up and
> that causes their capacitance value to drift allot and
> kill any chances of tuning your TC. Not to mention
> this heating can overheat and destroy the cap itself.
> With a 4:1 derating you are limiting this heating to
> to a tolerable level, that limits drift and keeps the
> cap from self destruction. This will however bring your
> max capacitance down by a factor of 4 as well.
> 
> 1.5nf in_series_with 1.5nf = .75nf * 8 = 6.0nf
> 
> Ray
> 
> > -----Original Message-----
> > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > Sent: Wednesday, April 11, 2001 6:11 PM
> > To: tesla-at-pupman-dot-com
> > Subject: disk capacitors any good ?
> >
> >
> > 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 free high voltage (30kv)
> > capacitors.
> > They are from a power supply of an x-ray generator immersed in
> > oil and in a
> > large metal box.  All 16 of them are soldered to a cocroft walton 
> (I think
> > thats how it's spelled) voltage multiplier board.   They are 1 
> 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:   would these BIG disk caps be any good for a neon sign 
> 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!
> >
> > Shaun Epp
> > Winnipeg, Manitoba
> > Canada
> >
> >
> >
> >
> 
> 
> 

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