Akula's circuits- is this the principle?

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Vidura posted this 3 weeks ago

Hello Team, after watching one of Akulas videos several times(Trance and Resonance) I think to understand a little bit better the principals of operation, and so I will share this observations here, hopefully adding up some useful information. Specially this circuit which is quite simple seems to be good to grasp the principle how it works, and also is cheap and quickly for built, in order to try to replicate.

Edit: viewing the valuable information about andrey melnichenkow that Chris has posted it becomes obvious that the credits for this discovering and buildings are corresponding to him ,and not to Akula, who evidently has merely copied Andrey's work.

This is the schematic he is explaining on the video, I'll post the relevant details: the test points are highlighted in the colour of the scope traces.

He seems to point out that the CD4069  inverter is not needed, or not important for the basic operation, at least the shaded area, the inverter connected to the external FET forms a synchronous rectifier I would guess and could be probably replaced by a shottky rectifier if the CD4069 is not employed . The resonant oscillations are driven by the MC34063 chip, which  is an analogue dc-dc converter driver. Here the internal circuit from the datasheet:

Now this reveals a very important aspect of the operation principle: note that the fundamental frequency of resonance is 269Hz (the low value indicates that the coils are bucking), but the switching frequency of the converter is set to a much higher value by the timing capacitor C  on pin 3(for 300pF it is approximately 25uS  Ton and 10uS Toff). The Inverting Comparator input on pin 5 will shut down the switching when a the threshold voltage on the output is reached. So when the output voltage downscaled by the resistor divider  on pin 5 becomes greater than the 1.25V internal reference, the driver shuts down. With this technique it can be achieved by adjusting the variable resistor , that the switching occurs predominantly at the lower halfwave of the cycle(in the case of the boost converter, where the pulses at the yellow highlighted test point are negative), which will maintain the fundamental resonant oscillation with a minimal expense of energy.

Another detail that has called my attention are the copper sheets inside of the bobbin, which are found on some other devices of Akula as well. I don't think that this is a emf shielding, more likely it forms a capacitance or capacitor in conjunction with the second sheet at the inner end of the second winding. This will of course have no effect at the fundamental oscillation of the coils at 270Hz, but referring to the switching period of the driver with a 35uS period it will have a mayor effect, and might be used in this design to achieve a capacitive coupling of the second coil.

Note that in the following screenshot the schematic sheet which is below the circuit in the video has two modifications marked:

First a resistor in series with the output Led's -likely a impedance correction

Second the variable resistor for the shut down signal is changed  to a diferent configuration - for a broader range of adjustment

 

I think that this particular circuit would be a good start point to experiment as the basic design is quite simple. And in my opinion first the coil set have to be tuned to the fundamental resonance frequency, which is the tricky part, then the adjustment of the driver pulses and load impedance should be easier.

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Vidura posted this 3 weeks ago

Also  I wanted to point out that in the other device  that Sergei Panov has bought from Akula in one of the videos where Sergei is explaining the principal of operation , he shows a very similar concept to apply a gated pulsing on a fundamental resonant oscillation(10 to 50kHz) and explained that the pulses coming in this case from a teslacoil has to be applied in the second quadrant of the sinewave in order to get the power amplification in the lower frequency resonant circuit:

Vidura posted this 3 weeks ago

here I have found a clearer schematic of the flashlight circuit, where the components values are better readable.

Chris posted this 3 weeks ago

Hi Vidura,

I replicated this circuit. Its a little difficult to get to the right working conditions if, like me ones electronics skills are only satisfactory.

I found putting a Variable Resistor on Pin 5 of the IC, I believe it was without consulting my notes, was a great help.

The Top Rail must be bought down for this Circuit to work, which initially is very un-intiutive until one finds that this Circuit can not work unless a Current is drawn, creating a Magnetic Field, "Generating" Energy to thus in-turn Charge the caps.

This lowering of the voltage also makes the IC increase in Frequency, via the Sensing Pin.

I spent a lot of time on my replication, but I learnt a lot!

I shouldn't, this will open doors for Trolls to discredit, but a video to share. Some of my very early progress: 

 

This was way back, years ago, when I first started replicating Akula's work. I spent a lot of time, but eventually, got it working.

 

Please remember, this is exactly the same as, and a copy from Andrey Melnichenko's work. Akula took Andrey Melnichenko's work, never gave him credit as far as I know, and portrayed it as his own:

 

 

 

 

 

 

 

 

P.S: Do you recognise this guy: Arthur Trankle of STEHO Energy?

 

I hope this helps a little?

   Chris

Chris posted this 3 weeks ago

Backups are important, data retention is critical!

Some more, of the original hand written notes: 

 

 

 

 

 

 

 

These notes were marked as: "Manual". More notes marked as "Schematic"

 

 

 

 

More notes, marked as: "Foto"

 

 

 

 

 

 

 

You already have the Videos.

A special thanks to the person that shared this data many years ago! I found this data very valuable and I am sure others will also!

   Chris

Vidura posted this 3 weeks ago

Thank's Chris for this Information, it's true that it might attract the attention of some Troll, but the most important is that it can help to get better understanding of the principals ,and encourage to more replications. If the members of the Forum are helping and supporting each others, it will be easy to deal with the Trolls!

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Chris posted this 3 weeks ago

Hi Vidura, very wise words my friend!

   Chris

Jagau posted this 3 weeks ago

the schematic that you put on the site help me better understand this project
thank you Chris

p.s. I learn to make youtube if you have stuff I'm interested!

Jagau

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Jagau posted this 2 weeks ago

 

 

Hy Vidura


Very interesting diagram, I can not read correctly at pin 3 the capacitor,

is that you will have another picture more clear but I see that you wrote further in your post 300 pf is it?
thank you for the diagram.

Jagau
 

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Jagau posted this 2 weeks ago

 

about EMI shieldind a possible explanation, see what they wrote in my electronic book,

Shields also intercept radiated noise and return it to its source through a low impedance.

Thus the need for a low resistance ground back to the source using the shortest possible path.

Jagau

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Vidura posted this 2 weeks ago

Hi Jagau,

I checked the video again , the Value of the capacitor  is 510pF, not 300. Altough in my guess the frequency of the pulses is not that critical, but it might be a good idea to use the variable resistor on the supply of the ic as chris recomended and as used in the original schematic from Andrey:

I still dont have tried ,as i have to order the ic and the ferrite pot to do so. 

Regarding the coppersheet i think that it might couple with the asociated E-field without loading the souce, but this is just my guess.

wish you success with a replication if you have planned to do so.

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