RE: "Warming Up"

["Tesla list" <tesla@xxxxxxxxxx>]

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.
>  >  >
>  >
>  >
>