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Re: series or parallel???

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Malcolm,
I think that you are right that the transformer sees the same peak voltage in eigher case. The peak capacitor voltage during the bang can not get higher than the initial voltage it was charged to (rings down, back up, back down, and so on). Maybe the real difference is the frequency that is associated with the peak voltage. In the parallel capacitor case, the peak voltage the NST is subjected to is at the RF frequency of the tank. With the parallel spark gap, the peak voltage is during charging and is 60Hz stuff. The RF voltage during the bang is much lower cause the plasma resistance is in the order of a few ohms.
Then again, maybe we need to look at the problem from the NST secondary coil's perspective instead of the terminal's perspective for the parallel capacitance case. If the NST secondary is trying to output say +10000 Vpeak at the time of the bang and the Cp has just oscillated to -10000Vpeak, what does this do to the insulation??? and the current??? Got to think about this one. 

Gerry R.


Original poster: m.j.watts@xxxxxxxxxxxx
On 29 Nov 2005, at 7:32, Tesla list wrote:

> Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
>
> Malcolm; At resonance and only at resonance Xl and Xc are the same and
> voltage of the coil or capacitor is Xl times I which may be well over v
> input The gap voltage is v input If the transformer is across the gap > the 
> voltrage is V input. Across a reactive component like the capacitor the
> voltage can be anything based on Z of the combination and the current > not V 
> input, but more than v input.
>     Robert   H

Draw out the circuit for both situations. You can treat the TC
primary as a piece of wire at mains frequency. You will see that
both situations are equivalent when considering gap settings.

Malcolm


>
>
>  > From: "Tesla list" <tesla@xxxxxxxxxx>
>  > Date: Mon, 28 Nov 2005 00:28:28 -0700
>  > To: tesla@xxxxxxxxxx
>  > Subject: Re: series or parallel???
>  > Resent-From: tesla@xxxxxxxxxx
>  > Resent-Date: Mon, 28 Nov 2005 00:27:08 -0700 (MST)
>  >
>  > Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
>  >
>  > On 27 Nov 2005, at 18:10, Tesla list wrote:
>  >
>  >> Original poster: robert heidlebaugh <rheidlebaugh@xxxxxxxxxxxxxx>
>  >>
>  >> Daniel;First of all the primary circuit is series. The question is
>  >> what is the power parallel with? For best results the power (nst) is
>  >> placed parallel with the spark gap to protect your NST from
>  >> overvoltage. If you place it parallel with your capacitor or coil > you
> >> are subjecting it to the resonont over voltage of the resonant > circuit 
>  >> which can be up to 5x the input voltage. That can distroy your NST.
>  >> Acrossx the spark gap you see only the voltage the gap spacing will
>  >> allow.
>  >> Robert   H
>  >
>  > One of the characteristics of a series resonant circuit is that each
>  > component (L and C) sees the same voltage with a phase/time
>  > displacement is it not? The reactances are the same at resonance and
>  > the currents are the same so......
>  >
>  > In both cases, the gap setting determines the voltage the
>  > transformer is subjected to. In the case where the capacitor is in
>  > parallel with the transformer however, the transformer sees the full
>  > primary ringing voltage whereas with the gap in parallel with the
>  > transformer, the transformer sees momentary transients only.
>  >
>  > Malcolm
>  >
>  >
>  >> --
>  >>
>  >>
>  >>> From: "Tesla list" <tesla@xxxxxxxxxx>
>  >>> Date: Sat, 26 Nov 2005 17:01:54 -0700
>  >>> To: tesla@xxxxxxxxxx
>  >>> Subject: series or parallel???
>  >>> Resent-From: tesla@xxxxxxxxxx
>  >>> Resent-Date: Sat, 26 Nov 2005 16:57:28 -0700 (MST)
>  >>>
>  >>> Original poster: "Langer Giv'r"
>  >> <transworldsnowboarding19@xxxxxxxxxxx> > > Hi again, I have seen > many
>  >> schematics where the spark gap is series > and the Capacitor is
>  >> parallel and vice-versa... Which is hte proper > way to put the LC
>  >> circuit, which is parallel and which is > series??  Thanks for > input.
>  >>>> Daniel From Canada > > _ > >
>  >>
>  >>
>  >>
>  >
>  >
>
>
>