Steve Ward used a secondary coil MMC inside the secondary coil, to
combat the huge streamer load on the small resonator.
https://www.flickr.com/photos/kickermagnet/page2
Kind regards
Mads Barnkob
On 25-05-2022 02:28, Daniel Kunkel wrote:
> Joshua,
> The voltage gain in a Tesla Coil is a ratio of either the inductance of L1
> to L2, or the capacitance of C1 and C2.
> https://wikimedia.org/api/rest_v1/media/math/render/svg/0e212023a432b67ae4a3174efd65e30802af3428
> As you can see, if you add more capacitance to the secondary circuit, the
> voltage is reduced.
>
> However, spark production is not all about voltage, you do need ample
> capacitance. That capacitance is achieved through the discharge terminal,
> which is typically a toroid or sphere. In practice this is a nice setup as
> the large smooth radii of the shape provides a higher break out voltage and
> yields (hopefully) the right amount of capacitance for nice spark output.
> Additionally, without a decent size/shape discharge terminal, unwanted arcs
> will appear at the top of the secondary. I also have to believe that adding
> this type of capacitance would be considered parasitic, much like the self
> capacitance of L2 (which is unwanted inefficiency).
>
> So can you add capacitance in series with L2 and the ground? Yes. Will it
> change Fres? Yes. Could you tune a coil this way? Yes...but this is really
> impractical. Aside from finding a capacitor to withstand that environment,
> it would probably be expensive...but also you would need a bunch of them in
> infinite capacitances to re-tune with any accuracy.
>
> A far easier and simpler solution is to tap the primary. You can move the
> tap 1/4" inch at time to finely tune your coil to the exact frequency for
> free and it is infinitely adjustable.
>
> You might want to look up "tesla coil counter poise ground"...that would be
> a related idea to what you are asking about...
>
> ~Dan
> Kansas City area
>
> On Tue, May 24, 2022 at 6:20 PM Joshua Thomas <joshuafthomas@xxxxxxxxx>
> wrote:
>
>> While playing around in JavaTC, I realized that the overall capacitance of
>> the secondary coil (and hence Fres) could be modified by placing a series
>> capacitor between the coil and ground.
>>
>> Tuning seems to usually be done on the primary coil by tapping, but this
>> also seems an option. Has this been tried, and what results/caveats were
>> there?
>>
>> Thanks,
>> Joshua
>>
>> --
>> Joshua Thomas
>>
>> My new email address is: joshuafthomas@xxxxxxxxx
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