Hi Fabrice,
R17/C8 form a low-pass filter. I don't think there is anything critical
about the values, it was just necessary to keep PSpice happy. If you're
seeing warnings about the pulse being too short, it must be that some crazy
VHF transients are occurring that are erroneously triggering the one-shot,
so they need to be filtered out. It's been a VERY long time since I set up
that model (or any other sim model) and I don't recall the details.
R15/R16 also have no functional purpose except to provide a resistive path
to ground so that the initial node voltages can be determined. If this
were a real circuit they wouldn't be needed, but with models having
infinite input impedance, we need to ensure there is a calculable initial
condition.
Regards, Gary Lau
MA, USA
On Tue, Apr 5, 2016 at 8:14 AM, Fabrice Piron <fabrice.piron72@xxxxxxxxx>
wrote:
> Hi
>
> I'm a new french member of this list and I built a static spark gap tesla
> coil ( my website is http://fabuleusephysique.fr). I'm very happy to join
> this group and I have already spent lots of time on the sites of Bart
> Anderson, Richard Burnett, Gary Lau, Kevin Wilson, Phil Tuck, Terry
> Fritz... thank you all for the great information provided.
>
> I just ran a PSpice simulation based on models by Terry Fritz and Gary Lau.
> The model is on this page
>
> http://fabuleusephysique.fr/projets/bobine-tesla-1/bobine-de-tesla-1-simulation-pspice/
> and is attached to this mail.
>
> Can anyone explain me what is the use of R17 and C8 ? I tried to run the
> simulation without them so PSpice sent warnings about the pulse sent to the
> 74123 being too short. So I guess R17 and C8 are there to lengthen the
> pulse produced by the "LIMIT" component, but I'm not sure.
>
> Another question: what is the use of R15 and R16 ? (sorry but I know
> nothing about the know-how of electronics...)
>
> Bye
> Fabrice
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>
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