Re: [TCML] Looking for MMC Capacitors

[Chip Atkinson <chip@xxxxxxxxxx>]

You can search the list archives for MMC.  THat's what I'd end up doing.

Chip

On Thu, 5 Aug 2010, DC Cox wrote:

> 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
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