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Re: Chokes, Caps, and resistance (fwd)



---------- Forwarded message ----------
Date: Thu, 18 Dec 1997 08:52:07 -0800
From: Joshua Resnick <seraphim-at-WPI.EDU>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Chokes, Caps, and resistance (fwd)

Ok so just to get everything straight, the order of stuff coming from
each leg of the xfmr is resistor, cap to ground, choke (correct?).  BTW
my ascii art does depict a sparkgap parallel to xfmrs.Thanks,
Josh

>
>
> to: Joshua
>
> Caps are from each bushing to ground -- not after the resistors as you
> have
> them.  Yes, resistors are definetely required -- see my other post on
> this.
>  Also, run your main sparkgap in parallel with your xmfr output -- not
> in
> series -- very bad.
>
>
> > All,
> >
> >     While still in the hunting, gathering, and planning stage for my
>
> > coil I think this is the perfect time to ask questions about the low
>
> > pass filters and other components that I need to attatch to my
> xfmrs.
> > It is my understanding that the only reson for the chokes is to
> "block"
> > any RF coming back from the tank from getting into the xfmrs.  It is
>
> > also my understanding that a pair of properly rated doorknob type
> caps
> > after the chokes should be used to act as a high pass filter
> allowing RF
> > to go to ground.  I also  hear talk of resistors in the TC circuit.
> Are
> > these used to spoil the Q of any resonance that might develope
> between
> > the transformer and the capacitor? Or are they there to damp the
> tank
> > itself (this doesn't make sense though!)?  If they are there to damp
> any
> > potential resonance between the cap and the xfmer then would they
> also
> > be placed on the legs of the transformers,
> > so the circuit would look like this?
> >                                    gnd
> >                                     _|_
> >                                    ----  C
> >               R          L         |          C                L
> > ----------/\/\/\/---()()()()------------|----|
> |---------()()()()()----
> >  xfmr  |
> spg                                       |
> >
> ---------/\/\/\/\---()()()()------------|----------------------------
> >             R           L         _|_
> >                                     ----  C
> >                                        |
> >                                   gnd
> > Another question that comes to mind is that if I'm not using neons,
> do I
> > even need resistance at all?
> >
> > Any advice would be appreciate.