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Re: self capacitance of flat and conical secondaries



Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:
Original poster: Mike <megavolts61@xxxxxxxxx>
Hi Terry, all,
Terry, you provided links to so good info for a recent post, but I'm considering winding a flat spiral secondary and can't seem to find an equation to estimate that in a flat spiral or conical coil. Does anyone have such information?
Thanks,
Mike

An estimation can be obtained from the capacitance of a flat disk,
that is C=8*e0*radius.
e0=8.85e-12, radius in meters.
Considering that the "self capacitance" of a cylindric coil is very
close to one half of the capacitance of a cylinder with the same
dimensions, one half of the capacitance of a disk shall be close to
the correct value. Maybe 3/4 of it if the output is at the edge,
or 1/4 if the output is at the center, considering the different
areas of the inner and outer halves of the coil.
Could someone verify?

Antonio Carlos M. de Queiroz