Quote from: Hoppy on April 29, 2014, 03:24:49 AM
In regards to coil turns, when Akula dismantles the coil he appears to remove off fairly equal lengths of wire with each pull. The count for the first winding is 23 lengths and 26 for the second winding.

Edit: I have now tried new software and the probe does appear to be connected.

hi Hoppy,

I do notice the same thing related to some similarity in term of winding between primary and secondary.Taking the width of around 22awg per strand of magnet wire.It look like it's around 60turns give or take.

But there is always a small catch.Base on one of my quick experiment done few months ago to verify inductance reading base on "1 turn /1 loop" around various ferrite &iron powder core which also included my most expensive "nanocrystalline core"

I find that even for 1 wire loop inductance test on various core the uH reading differs a lot.Fyi only-The nanocrystalline core did produce the highest reading for 1 loop test at 44uH.

Now lets get back to the topic-If we want to achieve a particular uH reading since all of us around the world would likely be using various types of pot core or flyback core."
The number of turns applied for me or anyone to achieve a particular uH or mH reading cannot be applied for another person whom is using another type of core."This is a  fact"

If Akula is using 50 turns estimate on 2000nm pot core to achieve the required uH reading .We can't follow the same number of turns unless we do have the same set of core.But we can alter winding to get the required uH or mH reading.

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Latest update-
It seems i have missed the delivery of the 4.7cm pot core which i would need to collect from post office tomorrow.But i don't have copper foil in hand yet at this moment.

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Latest discovery related to my experimental Don smith device(Not due for video release until i increase input voltage by around 5 fold to my 3meter oxygen free 5 turn 8AWG primary cable) after getting the long waited 2000volt capacitors which i also need to connect in series and parallel formation to support higher voltage."2KV Capacitors are already getting warm at mere 60volts to primary."
There is interference to my portable "digital FM radio" located around 4 meters away only once i hit resonance besides the bulb getting brighter at secondary."The reception became bad that i can barely hear music being played from radio"

I then recall base on Chinese forum link found on page 260 of PJKbook.

This word as found in Chinese forum would be of interest for some of us related to resonance on how it works"Yes some are my own connecting words just to make more sense".
It goes something like imagine knocking on the bowl constantly at the right  timing
the frequency/ringing of bowl would increase and increase.But If we knock on the bowl too soon or too late after the previous knock it won't work."It would hinder the acceleration of ringing frequency"

"Remember the knocking is done in low frequency <12hz  but the end result produced is high frequency" Similar to current 3v ou light device ....   

For Don smith device the applied frequency base on their experiment is around 210khz...230khz to primary.But at resonance for the team it went up to Mhz range 50Mhz.
For my case at this point it's just 172khz base on 5 turns uH reading 2.65uH and induction capacitor 0.3x uf ,due to existing IGBT limitations."It's already causing unexpected interference on the FM band"

Quote from: TinselKoala on April 29, 2014, 11:43:55 AM
And here are a couple of representative screenshots.

I determined last night that the BUZ11A mosfet doesn't really switch properly, even when the strong sinusoid from Pin 13 is present. To see if the transistor or mosfet is actually switching, you need to monitor the Collector or Drain signal, it's the only way to be sure. I say again: the noise bursts are causing the signal to the inverter which results in the transistor switching, not the other way around. There is feedback to be sure, but it does not seem to be the case that the DC-DC converter chip is responding to being pulled down when the mosfet switches... because my mosfet wasn't switching.

However the TIP3055 does switch properly, as you can see from the scopeshot below showing the collector (inverted) trace.

Note that I am now at 1 ms/div horizontally and the sinus oscillations are in the ballpark of the signal on Akula's screen. It's not stable for me, though, and I have some hypotheses about that, such as my lack of a nearby source that is singing at that frequency.

(These are made with the inner, smaller inductance on the transistor side and the larger on the 340963 side.)

ETA: Disregard the numbers in the "measurement" box.... they are using the entire buffer, I forgot to reset it to just use between cursors. So the measurements are including lots of time of unstable waveforms or even non-oscillating blanks. Please just read the traces themselves using the channel voltage setting and timebase. Sorry about that!

TK,

I don't understand the purpose inverter section.  Even when the MOSFET or transistor is turned on, it seems all it would do is apply an additional 200R load to the supply rail.

Also, keep in mind that CMOS inputs typically have input overvoltage protection.  Typically these are diodes or "pseudo" diodes made from additional CMOS elements.  Normally these diodes turn on at .5-.6V below ground or above Vcc.  Many of the input protect schemes do incorporate an internal resistance for current limiting when the diodes turn on, but the actual circuit topology used can vary between manufacturers.  I believe this is why you noted a difference in behavior with a different mfg device.

In one of your first videos on this circuit, as you increased the FG input to the inverter and the P-P V of the FG exceeded the rail, you can see the rail increase on the peaks as the input diodes begin to conduct.  At least that is what it looked like to me.

PW

Here's a comparison between the Collector of the TIP3055 and the Pin13 input signal to the 4069 inverter stage. The collector trace is High, at the supply voltage, when the transistor is OFF and drops to near the zero baseline when the transistor is ON and carrying current from collector to emitter. Neither trace is inverted.

And here I've take out the TIP3055 and replaced the BUZ11A mosfet. I've made no adjustments, not even tweaking the pot.

You can see that the Drain voltage remains at the supply voltage of 3 volts or just under, and barely moves when the large amplitude sinus happens on the input to the inverter. So the positive rail cannot be being pulled down to make the bursts to make the sinusoid.... it is the other way around. The sinus is the "input" from the bursts which make the sinus in the transformer, which then switches the transistor. The bursts and sinus occur whether or not the transistor or mosfet is switching, though, so pulling down the positive rail can't be the cause. At least that's how I'm thinking at the moment.

Quote from: picowatt on April 29, 2014, 12:31:26 PM
TK,

I don't understand the purpose inverter section.  Even when the MOSFET or transistor is turned on, it seems all it would do is apply an additional 200R load to the supply rail.

Also, keep in mind that CMOS inputs typically have input overvoltage protection.  Typically these are diodes or "pseudo" diodes made from additional CMOS elements.  Normally these diodes turn on at .5-.6V below ground or above Vcc.  Many of the input protect schemes do incorporate an internal resistance for current limiting when the diodes turn on, but the actual circuit topology used can vary between manufacturers.  I believe this is why you noted a difference in behavior with a different mfg device.

In one of your first videos on this circuit, as you increased the FG input to the inverter and the P-P V of the FG exceeded the rail, you can see the rail increase on the peaks as the input diodes begin to conduct.  At least that is what it looked like to me.

PW

The purpose of the inverter section is to act as a Red Herring. There is another one of Akula's miracle versions that only uses the 34063, no inverter.  And as I show in the scopeshot above, it is unlikely that any mosfet would actually switch. So the whole thing actually has zero function if a mosfet is used. The TIP3055 does work though.... but does it have a material effect on the operation of the device? Not that I can tell. The LEDs still dim and go out in a few seconds after the power is removed. Duh.

I've lost count of how many different devices and schematics he's published. It's like LMM on methamphetamine, good thing I can't read Russian.

Yes, I agree with your analysis of the inverter functioning.

Thanks for looking and posting, I really appreciate your insights and thoughts on this matter.