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Re: Magnifiers: how to?
to: Marco
The best way to do it is to eliminate the usual driver with separated
pri/sec inductors. To keep the coeff of coupling high this requires a lot
of insulation between the two coils to achieve the desireable 0.6 coeff. of
coupling factor. A better method is: on a 4 to 6 ft (2.5-3 m) dia
fiberglass coilform wind approx 50 turns of 1/2 inch dia copper tubing on
the lower part of the form and extend the winding with 2 AWG fine stranded
copper welding cable on the upper turns (usually an additional 75 turns is
all that is required). Your oscillator is applied across the lower portion
of the copper tubing (lowest turn is grounded of course) and tapped
somewhere into the copper tubing. This forms a series resonant driver
system that can be tuned with adjustable tap on the copper tubing. The top
of the welding cable feeds the bottom of your resonator coil and provides
the high current, high Q driver necessary for high resonant rise in the
resonator coil.
This forms a series resonant auto-transformer that feeds the resonator coil
while avoiding all the usually pri-sec insulation problems associated with
the two coil driver system. I'm sure you also know by now that the spark
gap system has to insure a very high rate of quenching with this type of
oscillator system.
Regards,
Dr.Resonance-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Magnifiers: how to?
> Date: Monday, February 08, 1999 12:02 PM
>
> Original Poster: "Marco Denicolai" <Marco.Denicolai-at-tellabs.fi>
>
> I am reading the "Colorado Springs Notes" and getting more understanding
> about how a magnifier should be constructed. Still I would like to ask
the
> list:
>
> - is there anybody who can tell me the resonance constraints between
> primary, secondary and "extra" coil? (I mean something like L1*C1=L2*C2
for
> the usual TC).
>
> - In practice, how primary and secondary should be built to achieve the
> high coupling coefficient needed? Wound on the same support, one on the
> other or how?
>
> - I have been told time ago that, for the same power, a magnifier will
> develop almost the same voltage than a 2 coil TC. But let's put it this
> way: if I build a magnifier almost same size of a 2 coil TC, will I be
able
> to pump it with more power and, therefore, develop a higher voltage?
> At least Tesla writes about the benefit of having the "extra" coil
> impedance not seen at the primary for it is not magnetically coupled with
> it.
>
>
>