The ferrite rod with the two opposing windings on it has been explained by Akula why
he included it in his circuit. Since it was Akula who put it in his own circuit, it seems likely that was his intention.
It may not really work as Akula intended it however.
If this component was just for changing the resonant frequency of the tesla coil, then it would
make more sense to just have some extra windings on a ferrite rod or an air core that are not wound
opposing, as having two windings of about equal turns count wound opposing on the same ferrite rod will
tend to cancel out the inductance and leave you with little inductance. Seems like a lot of fiddling around to just
change the resonant frequency of the tesla coil a bit when you can just simply add or remove some turns to a single
coil to get your exact desired resonant frequency.
There would really be no need at all to have a ferrite rod with two
coil sections wound in opposite directions so as to be opposing (cancelling). Ruslan also discussed this component
in his video yesterday. At any rate, based on Ruslan's devices, it would appear that the ferrite rod with its opposing
wound coils is not necessary to get the device working, at least not in Ruslan's particular arrangement anyway.
You can of course lower the resonant frequency of a tesla coil by connecting any metallic conductive object to the
top of the tesla coil secondary, as this adds capacitance to the tesla coil and lowers its resonant frequency.
It doesn't have to be wire or wire wound into coils. It can be any piece of metal. The bigger the piece of
metal, the more capacitance will be added to the tesla coil. This also acts to top load the coil, which
is another matter, which can change the way the coil operates to some extent. Even just having other coils or metallic
objects in close proximity to the tesla coil which are not electrically connected to the tesla coil will add capacitance to the
coil, and lower its resonant frequency somewhat. This is all very normal stuff for tesla coils of course and is a given.
Based on all this, whatever Akula's reason was for adding the ferrite rod was, it likely wasn't just for altering the resonant
frequency of the tesla coil. This should be apparent when you consider what I have mentioned above.
It's not a big deal to me if people want to speculate and draw conclusions that are not really supported,
but I am just commenting on this in case some other folks reading here might be getting confused.
Based on what Daly and Akula and Ruslan have done and described, the devices really just appear to consist of
a tunable inverter circuit driving a specially wound output coil which connects to the load and earth ground, and
this special output coil winding is placed in the near field (or possibly can be electrically connected) of either a HV pulser or a
tesla coil driven by a kacher circuit or similar. Beyond this fairly simple arrangement is just figuring out what
frequencies to use and coil dimensions and tuning, and possibly waveform synchronization. Although
the device does not seem very complicated, it of course doesn't mean it is necessarily easy to get all the dimensions
and windings and tuning and synchronization right to get working results.
Wish everyone the best in their experimenting...
P.S. My personal opinion is that we will likely have to think outside the box quite a bit to start to really understand what
makes these devices work, assuming they really do generate overunity. I have some ideas on this, but I will
keep it to myself unless I can prove it with a working circuit first.
