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Re: Flat coils & undamped waves (was Wire Length)

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

If you wind flat spiral and solenoid coils with the same gages of wire, and
with the same average radius and wire length, you will find not only are the
potential/current ratios different, but also the inductance/capacitance
ratios are different, too.  Similar coils with different geometries *do not*
have the same L/C ratio.

Without even building the coil, and using just a coil modeling program, you
can make these calculations and see for yourself.  Coil geometry *does* make
a difference.


You mention "resonance range" several times. What do you mean by this? Not a familiar term in this context.

If your comments above refer to "self resonance" and "self capacitance" I can't imagine anyone here has ever with you. Few people design inductors with the idea of using them without external capacitance and that capacitance is normally quite large compared to the distributed capacitance. With Tesla coil secondaries this isn't true and it is customary to consider both the distributed capacitance and the top load capacitance in the design.