Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
I just looked up the spec sheet for TDK doorknob caps. They make two
types:
UHV series w/ Z5T dielectric, and FHV series w/ Y5S dielectric.
Eyeballing the chart,
Over a range of 0-50*C, the UHV capacitance changed 28%.
Over a range of 0-50*C, the FHV capacitance changed 15%.
Regards, Gary Lau
MA, USA
> Original poster: "C. Sibley" <a37chevy@xxxxxxxxx>
>
> Hey Gary,
>
> You pegged it, I'm using Doorknobs and they do get
> warmer when running...
>
> The effect seems to also be less noticeable if the
> gaps are freshly cleaned. Might be an effect of one
> or more variables...
>
> Thanks,
>
> Curt.
>
>
> --- Tesla list <tesla@xxxxxxxxxx> wrote:
>
> > Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
> >
> > Ceramic caps, i.e. doorknob caps, will vary their
> > capacitance with
> > temperature. What kind of caps do you have? Do
> > they feel perceptibly
> > warmer after use?
> >
> > Gary Lau
> > MA, USA
> >
> >
> > > Original poster: "C. Sibley" <a37chevy@xxxxxxxxx>
> > >
> > > I've noticed that my 60mA NST powered coil gets a
> > > significantly longer spark after running 15-20
> > > seconds. After it "Warms Up" it starts at full
> > power,
> > > but if it's been sitting for a day it begins at
> > less
> > > than a third of the spark length.
> > >
> > > I assume it's out of tune when it's "Cold", do
> > you
> > > think this phenominom coukd be related to the
> > > capacitors? I seem to recall hearing once that
> > > capacitors could change capacity significantly
> > with
> > > temperature...
> > >
> > > Curt.
> > >
> >
> >
>