Kapanadze Cousin - DALLY FREE ENERGY

[Grumage]

Hi Grumage!
The reason your Power BJT stay only warm is you use less thicker magnet wire in you primary with more turns which result in more resistance and inductance, and more than that I see in your vids a generous heat sink, Nick use a only small one.
IMO the Nick's heat issues is not from internal fet diode, the switching capabilities of those are far beyond this setup requirement.

@Nick
If it's not to difficult for you, may use a processor heat sink with fan as Akula did, this must solve your heat issue for sure, but must electric isolate transistors from heat sink, if both on same heat sink.

Dear skywalker66.

I am now in total agreement with you!! I added a couple of external 60 A fast diodes they showed me there was little change to the operation of the circuit. BTW My heat sinks were the ones I used for my Akula replication. With those massively expensive IGBT's!!

Verpies has been saying that the more turns you have the better the working efficiency becomes. He also told me that any gap in a transformer core can and does cause high voltage spikes!!
But I think that this air gap is what is creating the effect. It needs to be investigated further with regards to Acoustic resonance!! I have tried a crystal pickup cartridge but the cartridge seems to still be affected by the electromagnetic field generated by the coils.

Perhaps another approach would be to use some form of optical arrangement??

Cheers Grum.

[baroutologos]

Hey Grum,

In short, running that YOke with FETs you get 80 or so p-p primary, aand when run by BJT with fast parallel diodes, behaviour does not change ( as originlaly) and get 200 p-p? Do i understand it correct?

What about frequency? Mosfet specs? Where you attribute this?
cheers

[skywalker66]

He also told me that any gap in a transformer core can and does cause high voltage spikes!!

I don't know about that. Did you see such spikes on your scope?

But I think that this air gap is what is creating the effect. It needs to be investigated further with regards to Acoustic resonance!! I have tried a crystal pickup cartridge but the cartridge seems to still be affected by the electromagnetic field generated by the coils.

The air gap is good at least for avoiding core saturation, as for "the effect", I look forward for such magic. Reaching acoustic resonance into the core, will quick heat up core and ultimately destroy it. But it worth a try for fun. As I suppose you want to check nodes and antinodes along ferrite using a pickup cartridge. Is your cartridge piezo or electromagnetic ? It is also possible your cartridge be affected by the core's emitted sound and act as microphone, is it?

Perhaps another approach would be to use some form of optical arrangement??

For reading vibration of core I suppose?  That will be quite nice, but how? Something like plate with sand above a speaker ? but in this case will be more elaborate to create a visual map of nodes / antinodes. Until then a small piezo sensor moved along the core can give you some insights.

An experiment can be done: a piezo speaker glued at one end of bar ferrite (or U shape) half immersed in sand granules, a signal generator for powering that piezo speaker, sweep frequency and see formed patterns in the sand. Just a thought.

Cheers.

[verpies]

For reading vibration of core I suppose?  That will be quite nice, but how?

There are two ways:
1) The vibration of the core can vary the angle of laser beam incidence on a small mirror (e.g a piece of aluminum foil) which is affixed to the core. The pivoting mirror modulates the relection angle and changes the position of a laser spot on a far away screen (e.g. a wall) and can be picked up by a scope connected to 9V battery and a good photodiode, e.g. the Hamamatsu S7815.

2) A laser beam can be split in two and one beam can be directly directed to a diffraction screen, while the other beam is indirectly directed to the same diffraction screen via a small mirror glued to the vibrating core.  The moving interference pattern, thus formed, can be sensed by a photodiode.  Note that in this method the mirror glued to the core does not need to pivot, because it works on the principle of an interferometer which measures the difference in the distance traveled by one beam of light versus the other beam (via the moving but non pivoting mirror).  Since the wavelength of light is very small, the sensitivity of such interferometer is very high.  So high that NSA is using this method to remotely eavesdrop on vibrating windowpanes from their blimps.

[skywalker66]

There are two ways:
1) The vibration of the core can vary the angle of laser beam incidence on a small mirror (e.g a piece of aluminum foil) which is affixed to the core. The pivoting mirror changes the position of a laser spot on a far away screen (e.g. a wall) and can be picked up by a photodiode, battery and a scope.

2) A laser beam can be split in two and one beam can be directly directed to a diffraction screen, while the other beam is indirectly directed to the same diffraction screen via a small mirror glued to the vibrating core.  The moving interference pattern thus formed can be sensed by a photodiode.  Note that in this method the mirror glued to the core does not need to pivot, because it works on the principle of an interferometer which measures the difference in the distance traveled by one beam of light versus the other beam (via the moving but non pivoting mirror).  Since the wavelength of light is very small, the sensitivity of such interferometer is very high.  So high that NSA is using this method to remotely eavesdrop on vibrating windowpanes from their blimps.

  Your methods might work assuming someone have access at sensible laboratory equipment and core is not covered with turns.
  In our case - I mean searching Geo's yoke core fully turns covered for sweet spots it seems impracticable with your laser methods.  Anyway, at least for me sound like rocket science.
I look forward for Geo's first interferometric measurements on his Yoke. but I'll be happy just with some current measurements.