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Re: Low Voltage Primary
Comment from Ken Herrick:
It ain't either the volts or the amps, it's amps x turns: the secondary
only "cares about" magnetic flux, and that's proportional to
ampere-turns. I've found, in my t.c., that with 160V of
secondary-resonance ac applied to my 1 primary turn, the current thru it
is around 250A, giving ~16" or so sparks from a 4" c.s.d. aluminum-duct
toroid atop a 1500T secondary. I need a bigger or smoother toroid-c.s.d.
to find out what greater spark length I can get: I can readily see from
the secondary's waveform that it has a "way to go" before the voltage
rise tops out. And I plan shortly to increase the 160V to 2x or 3x that,
for commensurately bigger zap.
The problem with low supply-voltage is: how do you turn it into ac? A
spark gap is out (a gap won't, of course, fire at such a low voltage), so
you have to use (fast) transistors. That's what I'm working on. I'll
not be more specific now since I have a patent-appl. in for the primary
configuration (not necessarily related to t.c. work). Also, if you want
hi current/lo voltage, you must necessarily end up with a small quantity
of turns (in my case, 1). Thus, as you point out, a resonant primary is
not feasible. That happens to be fine with me since I then have only 1
resonance to contend with (the secondary's) and not 2.
Regards- KCH
On Sun, 19 Dec 1999 20:03:51 -0700 Tesla List <tesla-at-pupman-dot-com> writes:
>Original Poster: ross andrews <sflourine-at-home-dot-com>
>
>
> Hi all,
>
> I am interested in using low voltages for the tank circut. If
>one were
>to use a 240V tank circut, one would save the cost of transformers
>and
>caps, not to mention putting immense amounts of current through the
>primary coil. (all this stemmed from reading a paragraph about "it
>ain't the volts but the amps that matters"). However, plugging
>numbers
>into wintesla gave some disappoiting numbers: since the capacitance
>of
>the main cap would need to be around 230 uF, the primary's resonating
>frequency is very low, around 1.7 kHz. Using standard 1/4 wavelength
>calculations, this gives a secondary amounting to 13000 or so turns
>(wintesla). After admitting that a spark gap will not be easily
>constructed (I have a few ideas, ranging from ionized gas to statues
>of
>Buddha) My question is: Is it possible to use the recommended
>600-1000
>turns and still get the coil in good tune since the 1/4 wavelength
>idea
>has be disproven? Anyone have any ideas? Keep in mind that my
>knowledge of coiling is sparse at best.
>
> Thanks,
> Ross
>
>
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