Yes. Check out the pictures on page 2 of the linked gallery. You can see
the string of blue capacitors inside a tube, that is inside the
secondary coil.
I am not sure, but he might have had it filled with oil or epoxy...
Kind regards
Mads Barnkob
On 26-05-2022 04:02, Joshua Thomas wrote:
> Inside the secondary coil? Thatâ??s actually possible without flashover or
> other faults?
>
> On Wed, May 25, 2022 at 4:47 PM Mads <fleex@xxxxxxxxxxx> wrote:
>
>> 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
>>>> Please update your information if you have not already done so.
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