Re: [TCML] DC Coils

[Finn Hammer <f-h@xxxx>]

Carlos, all

I think Carlos, referring to voltage being doubled, is talking about the
DC resonant voltage doubling of the tank cap, due to energy stored in the
charging inductor during the time the gap is conducting.
This requires a blocking diode between the cap and the inductor, also
called the de-qing diode.

Carlos, can you confirm that such a diode is in position?

Cheers, Finn Hammer

----- Original meddelelse -----

> Fra: Bert Hickman <bert.hickman@xxxxxxxxxx>
> Til: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Dato: Ons, 11. jan 2012 22:21
> Emne: Re: [TCML] DC Coils
> 
> Hi Carlos,
> 
> Sounds like your DC rail is collapsing under load. Have you tried
> increasing the values of your doubler and DC storage caps?
> 
> Bert
> 
> lightningfor@xxxxxxxxxxxxxxxxxxxxxx wrote:
> > Scott,
> > I have tried increasing the break rate, and it does increase power
> input
> > and to some degree spark length.
> > My inductor is calculated to give a max bps of 500bps, and spark
> gap works
> > smootly up to that break rate. (below extinction frequency)
> > My inductor is also multi tapped, so I have tried smaller
> inductances to
> > allow more current, but this did not help.
> > The only thing I can think of to explain the results is that the
> 10kv
> > supply is not being doubled...
> > But based on the spark gap I am using, I do not believe that is the
> case.
> > Also, back in the early days of coiling when I used to use 10kv AC,
> the
> > coil would still be drawing more power and producing big arcs with
> a cap of
> > this size and similar break rate...
> >
> > carlos
> >
> >
> >
> > On Tue, 10 Jan 2012 15:23:20 -0500, Scott
> Bogard<sdbogard@xxxxxxxxx>
> > wrote:
> >> Hi Carlos,
> >> Having never built a DC coil you should probably ignore me, but if
> > I
> >> had to guess I would say your doubler is limiting your current. If
> you
> > can
> >> vary your spark gap speed you can determine if this is the issue,
> if a
> >> faster break rate improves performance, current is not an issue,
> it was
> > a
> >> calculation error, if it worsens performance, I would guess your
> current
> > is
> >> being chocked by the doubler. Again, probably best to ignore me,
> I've
> >> never built a DC coil, but you are correct for similar power
> levels
> > results
> >> should be the same...
> >>
> >> Scott Bogard.
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> >
> 
> 
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