Re: [TCML] Looking for MMC Capacitors

[DC Cox <resonance@xxxxxxxxxxxx>]

yes, there is a posting in the list archives on this subject.  Perhaps the
moderator could advise on the document location?

I used to calculate the resonant value, then go about 1.2 x  larger or
smaller.  I used to always go 1.2 to 1.3 times larger, but the sparks are
more rat-tat-tat machine gun style as the xmfr can't quite fully recharge
the cap bank before it fires.

Now I prefer to go res value x 0.90 to get 10% under resonant value.  Plenty
of current and the spark has a nice "happy" sound and it dances around the
HV electrode a lot smoother.  The sparks are a few inches shorter but have a
very pleasant sound off the HV electrode.

Just a matter of personal preference I guess.

Dr. Resonance




On Thu, Aug 5, 2010 at 5:06 PM, <jhowson4@xxxxxxxxxxx> wrote:

> Just a thought, but is there there a chart or graph somewhere to assist in
> choosing cap size?
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off you hands."
>
>
> ----- Original Message -----
> From: "DC Cox" <resonance@xxxxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Thursday, August 5, 2010 4:48:59 PM
> Subject: Re: [TCML] Looking for MMC Capacitors
>
> I carry them in stock. What size xmfr asre you using/ That determines cap
> size.
>
> Dr. Resonance
>
>
>
>
> On Thu, Aug 5, 2010 at 12:23 AM, Ray Whiteside <rs.whiteside@xxxxxxxxxxx
> >wrote:
>
> > I have had a hellacious time finding appropriate caps to buy for my MMC.
> > The
> > tank capacitor needs to be close to 10nF and be able to withstand around
> > 16kV, so I've been looking for 1-2 kV caps and capacitance values to keep
> > the number of strings somewhat reasonable. Polypropylene caps with
> > charge/discharge rates over 1000 V/microsecond and all the other above
> > requirements have been very difficult for me to track down online, and
> when
> > I finally do the minimum order is something like 150 pieces.
> >
> > Essentially I'm sorry for the really noob/seemingly google-able question
> > here, but could someone point me to a good source for small coil caps
> > and/or
> > another solution? I have already bought one set from a sub-par site, and
> > the
> > lack of complete spec sheet on the site led me to end up buying caps with
> > the same part number as what I wanted, but another version with 1/5th the
> > capacitance value. I am trying to see if I can use some good will from
> here
> > to avoid another such mistake. :)
> >
> > Thanks
> > --
> > Raymond Whiteside
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
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