Kapanadze Cousin - DALLY FREE ENERGY

[d3x0r]

Not really wrong thread. Akula seems to be using pulsing of ferrite cores a lot, whether it is a TV yoke or
a ferrite torroid, etc.  The scope waveforms I posted above seem to be quite similar to what Akula showed
in the video I referenced above. Your waveform appears quite a bit different however... Not sure what is going on yet, so
I am looking for feedback from anyone who may have some ideas...
All the best...   

Sure mine ARE different, but akula's http://youtu.be/S-EmSMOYXVc?t=8m25s is also different from the ones you were showing.
What is causing the long slow slope-up over 250us in yours?
I've been looking for feedback for a while now... what I get is 'redesign it so it doesn't do that'

[Void]

I've been looking for feedback for a while now... what I get is 'redesign it so it doesn't do that'

Ha ha. I guess if you can't explain it, then make it go away...   
P.S. the time it takes to die down depends on the frequency I am set to of course.
It happens faster at higher frequencies...

[d3x0r]

Ha ha. I guess if you can't explain it, then make it go away...   
P.S. the time it takes to die down depends on the frequency I am set to of course.
It happens faster at higher frequencies...

Hmm... but at a higher frequency if you extend the duty cycle it should stay the same...
that same video earlier is the same as your first akula shot
http://youtu.be/S-EmSMOYXVc?t=5m48s
and later after he adjusts the capacitance on the base of the transistor after the previous youtube link is the second shot.


what does your circuit look like?  I have a similar waveform on my bench now with the current coil... other than I can't get the second downkick... but at the top of yours there's a notable delay where it rises also... looks like what I had with a diode between power and the primary and a capacitor on the collector.
Oh and adding a diode from the emitter to ground I can get a negative peak... but it quickly equalizes from the power rail.

[Void]

Hmm... but at a higher frequency if you extend the duty cycle it should stay the same...
that same video earlier is the same as your first akula shot
http://youtu.be/S-EmSMOYXVc?t=5m48s
and later after he adjusts the capacitance on the base of the transistor after the previous youtube link is the second shot.


what does your circuit look like?  I have a similar waveform on my bench now with the current coil... other than I can't get the second downkick... but at the top of yours there's a notable delay where it rises also... looks like what I had with a diode between power and the primary and a capacitor on the collector.
Oh and adding a diode from the emitter to ground I can get a negative peak... but it quickly equalizes from the power rail.

I am not changing the duty cycle, so not sure what you mean. Duty cycle in my testing was
kept to a very minimum -> about 10% to 20% max. I have actually been using the pulser circuit board
made by RM Cybernetics, and I don't know the exact circuit, but it is basically a control circuit
to set the frequency and duty cycle, which drives a FET. I need to build one now which is simpler
so I can try again and compare results. A simpler circuit should be easier to analyze. I might
try building Akula's pulser circuit for comparison, but I will have to order some parts first.

The pulser module I have been testing with is very close to this one on the RM Cybernetics website,
but I have the prior version of this module. The one on the website is their version 2 module, which has
a few changes.
http://www.rmcybernetics.com/shop/pulse-modulator-ocx

[Void]

This is what I was getting using the little 12VDC 5AH SLA battery when the pulser circuit
breaks into apparent full out oscillations at each pulse. The waveform was more
like an increasing trumpet waveform when using my regulated DC supply, at even higher negative
voltage peaks The scope is set to 100V/div. It is kind of odd to get those voltage swings across
the coil being driven considering that the battery is only 12VDC. Negative back pulses can get really
large when pulsing a coil even with just a low voltage, but you usually don't get such large positive voltage swings.
Maybe the small capacitance in the scope probe across the coil is causing the large resonant appearing swings...

Let's see if that might explain it.
With the scope probe on X10, it is probably around 15pF to 25pF or so, according to the specs... I'll use 20pF to calculate...
The coil I am pulsing is about 5 mH.
That gives a resonant frequency around 503 kHz.
Approx. frequency of the oscillations in the attached scope shot is about 500 kHz or so.
It seems to make sense. Frequency of the large oscillations is related to the capacitance of the scope probe in parallel with the coil being pulsed.
It looks like I need to take the scope probe out of the circuit and see if anything unusual still remains...

That still doesn't explain the even higher frequency oscillations appearing mainly within the positive waveform swings,
but that is secondary to the big oscillations... I will tackle the big fish first. 
Ferromagentic resonance? Maybe its in there somewhere, but I still need to do a lot more
testing and analyzing... At the moment it is still looking a lot like unstable operation of the pulser circuit along
with resonance oscillations caused by the scope probe in parallel with the coil being pulsed, although
there is something else unusual going on there which should be noticeable to those who have been doing
their homework and doing tests with pulsing circuits...   I still need to investigate that aspect a lot more yet...