Re: REAL CAPACITOR (where can i buy one?)

["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 Ed, All.  What kind of plate or conducting/insulating surface
arrangement did you find when you went inside the faulty barium cap? 
What the heck is in these things anyway?  I mean, the barium is just an
exotic clay is it not?  So what makes it work?  What kind of manufactured
plates are hidding inside that hard clay matrix?  Or is it just the
different mixtures of clay at center point that give out with the effect
of capacitance.   Reason I ask, is I am into ceramics and glass fusion
and I would like to try to make and bake them on an experimenter scale if
in any way feasible.  Do you think it possible for a home brewer to do
this with standard compaction and a kiln or hi powered glass fusion
microwave oven? I would like to fabricate my own ceramic caps, even if
they are not up to the standard of the industry, it would be a neat
experiment to try by using the good old red clay from my own backyard! 
Is it possible?   Ideas anyone?   Al.

On Tue, 10 Apr 2001 12:47:16 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "Ed Phillips by way of Terry Fritz 
> <twftesla-at-uswest-dot-net>" <evp-at-pacbell-dot-net>
> 
> Tesla list wrote:
> > 
> > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <uncadoc-at-juno-dot-com>
> > 
> > Hi Drew, you want a good indestructible cap?  Get barium titanate
> > doorknobs!  These things rock!  I run them for 60 minutes at a 
> time,and
> > if stacked properly they will NOT overheat or drift.  So forget 
> about all
> > the hate mail you will get about the barium titanate caps drifting 
> when
> > hot, just stack them properly and they will exceed all your 
> expectations,
> > they rule!!!!!  Stack them properly for your coil and you will 
> have a
> > reliable easy to use and interchangeable bank that will survive 
> any and
> > all power that you put into them.  And if stacked properly, they 
> will
> > easily exceed any rating of your power supply. I have still yet to 
> see
> > anyone on the list that can run a set of other kinds of caps for 
> 60
> > minutes at a time on their coils without overheating.  All I get 
> is, well
> > gee wiz, who needs to run a coil for a 60 minute period! 
> 
> 	I've had very good luck with these devices myself (they have 
> very low
> series resistance), but have never had enough to "stack them 
> properly". 
> In the beginning I lost a couple due to over heating, but learned 
> from
> my mistakes and don't run the coils long enough for tht to occur.  I
> dissected the failed capacitors and found that that the ceramic had
> cracked, eventually resulting in a low-resistance short.  I also
> experienced detuning due to temperature change.  If one had enough
> capacitors to hook them in series parallel so as to achieve the 
> desired
> capacitance while keeping the voltage across each one low enough, 
> that
> they would indeed run forever. 
> 
> 	Botom line is that they're a good way to start if you can 
> get them
> cheaply enough.  However, if I were starting over I'd probably build
> some form of MMC, if for no other reason than "everyone's doing it".
> 
> Ed
> 
> 
> 

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