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RE: Strange shock (fwd)
Gary:
That is exactly my point!
It is during the operation of the coil that the charge
is formed! Uncoated coils produce the same effect.
Therefore, I do not believe it is the varnish. I have
seen it most prominently in equidrive circuits. By the
way what is, 'the rectification mechanism of corona'?
Have you ever experimently proven this as a repeatable
effect? I would like to see a paper detailing your
experiements and your scientific conclusions. If this
were somehow true and not produced from the damped
ring down charging system, you would see this effect
on continuous wave oscillators as well. Do you own a
vacuum tube coil? Is the static charge there from the
corona? Or is this just a guess?
Regards,
Dan
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
>
> Hold on. The distributed capacitance of the
> secondary has nothing to do
> with these shocks. The shocks are from a _DC_
> static charge deposited on
> the surface of the secondary's polyurethane (or
> whatever) coating. The DC
> charge occurs due to the rectification mechanism of
> corona - that it occurs
> more-so in one polarity than the other. What's
> underneath this charged
> layer of polyurethane - a coil of wire or a solid
> tube of copper - doesn't
> matter. The distributed capacitance of the
> secondary can't matter as this
> capacitance only matters at high frequencies. At
> DC, distributed
> capacitance can hold no charge.
>
> Gary Lau
> Waltham, MA USA
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Friday, July 14, 2000 10:48 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Strange shock (fwd)
>
> Original poster: "Daniel Boughton"
> <daniel_boughton-at-yahoo-dot-com>
>
> Antonio:
>
> While it may be true that ionized air store
> pockets of
> charge heavily insulated coils have significantly
> higher distributed capacitance resulting in a
> lower Q.
> This distributed capacitance coupled with the
> terminal
> capacitance is what accounts for the an inductor's
> self resonant frequency. To find the value of the
> distributed capacitance one must measure the coils
> self -resonant frequency and inductance. This can
> then
> be applied to the coil's series resonance formula
> to
> determine the coil's distributed capacitance
> value.
> Note this is to be done without the terminal
> capacitance. The distributed capacitance will be
> seen
> not to be as low as you might think. Secondarily,
> the
> charge in the coil is minute until the larger
> capacitance offered to the coil by touch is
> presented
> by the human body. The result is an in-rush of
> current
> to stabilize the voltage. This in-rush (reactive
> effect)is often much higher than the residual
> charge
> which accounts for the formation of a spark. This
> is
> the phenomena of a capacitor anyway. That is a
> capacitor will supply any current necessary to
> keep
> the voltage across its terminals at equilibrium.
> It
> doesn't create energy it just generates current as
> a
> function of time. In otherwords, I can generate
> 0.5
> Coulombs per second or use the same charge to
> generate
> 0.5 Coulombs per millisecond. The rate is
> determined
> by the value of the capacitance while charge can
> remain constant.
>
> What does his coil resonate at anyway 250KHz?
> 100KHz?
> What's the value of his inductance? What is the
> value
> of the capacitance needed to cause his coil to
> resonate at that frequency with that value of
> inductance? Not so small. This is why F.E. Terman
> states mathematically that the highest Q helical
> resonantor is found when the winding length of the
> coil is equal to or less than its diameter.
>
> Dan
>
>
>
>
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