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Re: Why does top capacitance work? (fwd)
---------- Forwarded message ----------
Date: Thu, 27 Feb 1997 08:09:05 -0800
From: "David E. Sharpe" <sccr4us-at-erols-dot-com>
To: Tesla List <mod1-at-pupman-dot-com>
Subject: Re: Why does top capacitance work? (fwd)
Tesla List wrote:
>
> ---------- Forwarded message ----------
> Date: Thu, 27 Feb 1997 00:48:41 +0000
> From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
> To: Tesla List <mod1-at-pupman-dot-com>
> Subject: Re: Why does top capacitance work? (fwd)
>
> At 05:29 AM 2/26/97 +0000, you wrote:
> >
> >
> >---------- Forwarded message ----------
> >Date: Tue, 25 Feb 1997 20:20:30 -0800
> >From: Greg Leyh <lod-at-pacbell-dot-net>
> >To: Tesla List <mod1-at-pupman-dot-com>
> >Subject: Re: Why does top capacitance work? (fwd)
> >
> >Ed Sonderman wrote,
> >>
> >>
> >> Ed,
> >>
> >> I was curious if you noticed where the extra 3kVA power went when you
> >> increased to 7kVA. Did something get 3kVA hotter?
> >>
> >> -GL
> >> >>
> >> GL,
> >>
> >> I measure the power into the system by monitoring the pole pig primary
> >> current and voltage. The only thing I can tell you for sure is the watts
> >> consumed. As to where they went, I am not sure, maybe into the spark gaps?
> >> Maybe it gets reflected back into the primary and is lost as radiated
> >> energy?
> >>
> >> Ed Sonderman
> >
> >
> >Ed,
> >
> >At this point, it seems crucial to know _how_ the extra power was applied to
> >the coil. Did you increase the primary voltage (longer sparks), or increase
> >the gap rate (thicker, faster sparks above ~300 PPS) ??
> >
> >-GL
> >
> >------------------------------------------------
>
> Ed & GL -
>
> Finding the true wattage input to a Tesla coil is impossible without very
> elaborate instrumentation. The power is voltage times current times
<<SNIP for Chip>>
I have an OPTOISOLATED solid state wattmeter which measures true average
instanteous power which I have been using on a small (1kVA) magnifier
very successfully for the past 18 mo. It consists of a NEC 4 channel
(16pin DIP) optiosolator in a bridge configuration, driving a 741
op amp as an integrating multiplier (via the logarithmic effects
of the optocouplers).
The circuit was in EDN several years ago, is fairly accurate +/-
5% at 1.3kVA, and is CHEAP :^) , less than $50. I believe
accuracy can be improved further, I just don't have the time or
inclination with work overtime etc. to pursue yet.
I am presently increasing capability for a 7.5-10kva?? magnifier
I am building. If interested contact directly
DAVE SHARPE, TCBOR
>
> I would be interested in hearing comments on how the true wattage input
> could be metered so we can compare the classical TC with the magnifier.
>
> John Couture