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Re: [TCML] secondary variable frequency

Hi Scott,

Adding a toroid say just below the primary would have little effect on frequency, but any external object near the coil will lower the frequency a little (even a simple strike ring makes a minor contribution). Depending on geometry of toroid and coil, even raising the top terminal can lower the frequency. But as far as a cap between ground and the bottom secondary, the capacitance of the coil and the "new cap" would be in series. This would decrease capacitance and increase frequency. Now if an external cap was in parallel with the secondary then the frequency would lower (excluding all obvious hv issues).


Scott Bogard wrote:
Hey all,
I've got a theoretical question. Adding a top load lowers the tesla coils resonant frequency, what about adding a bottom load? Would putting a toroid or some kind of capacitor between the coil and ground lower the coils resonant frequency? I think I may have touched on this subject before, but for a different reason. In any event, will a cap in series with the secondary (on the grounded end) lower the coils resonant frequency, and is there any way to raise it beyond what it naturally is (inductor in series possibly?) This is a theoretical question, I'm not really that interested in the possible negative effects on performance (although I am sure they are a consideration.) Thanks.

Scott Bogard.
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