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Re: Transformerless Tesla coil
Original poster: "Jolyon Vater Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
Is it not likely that the current drawn by the output network from the
"primary" resonator (L1-C2) would actually be quite small -as the voltages
at the terminals of the two "secondary" resonators are 180 degrees out of
so the arms of the "bridge" together will act as a paralell-resonant tuned
exhibiting high dynamic impedance at the resonant frequency?
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
Sent: Wednesday, September 18, 2002 2:13 PM
Subject: Re: Transformerless Tesla coil
> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
> Tesla list wrote:
> > Original poster: "Jolyon Vater Cox by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
> > Antonio,
> > Apart from being a bridge isn't the proposed twin transformerless TC
> > actually a pretty good BALUN -to use the radio terminology- as it has
> > unbalanced input and balanced outputs?
> The application is quite different. In this case the transformation
> is from the energy in a charged capacitor into balanced oscillations
> in two terminals. Baluns are basically just transformers.
> > Also while it may be more difficult to tune, wouldn't it be more
> > and less complicated to build than most of the other twin-Tesla coil
> > configurations that have been published -after all, I can foresee twice
> > many primary components (2 x L1, 2 x C1), balanced-output HV transformer
> > centre-tapped grounding for a twin TC done the other way!
> A conventional twin would have a single primary capacitor and two
> complete Tesla transformers, with the phasing of the transformers
> adjusted to result in balanced outputs. In this directly/capacitively
> coupled twin the two primary coils are replaced by a single off-axis
> inductor and two "influence planes".
> (=====)a (=====)b
> | |
> L2 L2'
> | |
> o------+--C1--+----(=) | (=)---(=)-+-(=) <-Two influence planes
> o | |
> PSU gap L1 |
> o | |
> o------+------+--------+---------------o Ground
> The construction is really simpler. But this system would probably
> not achieve the performance of a classical twin Tesla coil. Its
> dynamics is the same of a "capacitive transformer" coil, with the
> strong limitation of the compromise between many cycles for complete
> energy transfer and low voltage gain.
> An interesting aspect, however, is that this circuit produces
> twice more output voltage than the equivalent capacitive transformer
> coil for the same input voltage.
> Antonio Carlos M. de Queiroz