Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

   TK:
   Ok, well if that was in reference to my circuit. I should also mention that I did previously have installed 10 ohm resistors going from TL pins 9 and 10 to the drivers, and only 460ohm as the pull downs. I've since changed both those previously installed resistors to the presently installed new 1k resistors, both as pull downs as well as going to the driver chip. And, still the 10 ohm from the drivers to the fets. They are the bigger resistors that you can see on my last videos. Overkill on their wattage, so I'll down size them, on my next build.

   My snubbers are installed, they are the two 1k, 4 facing zeners, and the two MUR1530. And, the 10 ohm resistors on the gates. That's it.
   This is what it looks like now.

[TinselKoala]

What is the voltage you are supplying to the Pins 8 and 11 of the 494?

[NickZ]

  Pin #8, 11, and 12 are getting 12v. Through the 12v voltage regulators and filters. Clean signal at the gates, no signals at the drains. I'm going to look into this later today.
 
  EDIT: Check the current pic of the drivers, in my last previous post. I just added it.

[itsu]

  Itsu:
  What I have noticed in last nights testing was that the TL494 works fine through out the frequency ranges while the duty cycle is at full duty, or nearly full duty cycle. But still showing at least 4.5v output at pin 9 or 10. If by adjusting one or both controllers the voltage drops below 4.5v, at those pins, the signal messes up. And the best working voltages readings from the 9 and 10 pin is between 5.2v down to 4.5v, but no less than 4.5.  It can't handle getting less than 4.5v to those two pins, 9 and 10, without messing up.
   Any ideas on what to do about that?

   The device is now running on 24v from my PSU, to the yoke and through it's filters and choke coil to the yoke center tap.
   The separate filtered 12v is going to the TL chip, and filtered 15v is going to the UC4420 drivers.
   The Yoke is connected now, to the fets, and is receiving the filtered 24v input to it at the center tap.
   Earth ground is in the STAR formation. 
   Fets are staying stone cold, but no bulbs are lighting on 3t or 28t yoke coil.   
   I still don't know why that's like that. So, I'm looking into it.

Nick,

so you run the TL494 at +12V to pins 12, 11 and 8.

At it lowest frequency setting (12Khz at my setup) and max. duty cycle setting (44% at my setup) my Fluke DMM at the DC Voltage setting shows 4.7V when measuring pin 10 output
compared to ground.   This is the rms value of the 44% pulsed square wave (11.7Vpp) on pin 10.

When reducing the duty cycle this DDM measured value goes down which is logical as the rms value drops.
It however never "messes up".

Please show a video when you see this "messing up" taking place, have the DDM hooked up and a scope to the same pin.
Try to retrigger the scope when any "messing up" appears.

Video here:   https://www.youtube.com/watch?v=LdTbmPMYZqM

Concerning the snubbers, it seem to me you have no snubbers installed right now, the two 1k resistors at the gates and 4 facing zeners are no snubbers like TK already
mentioned, and the two MUR1530 are merely aiding the internal diode in the MOSFETs.
Snubber components are installed at the drains of the MOSFETs

Regards Itsu

[itsu]

Good day Itsu

Yes, I have also  thought about Ruslan's statement referring to the Grenade as a 1/2 wave antenna @ 4Mhz.

While a Half Wave antenna can be a *center fed dipole*, a Helical spiral wound single layer resonator (in Free Space) has also been shown to exhibit a Self Resonance  Frequency  (Fres) equal to approx Lambda/2.  (See attached doc.)  This is in *Free Space* so of course no ground is connected.  Likewise, I remember Ruslan testing the Fres of his grenade coil when it was NOT connected to ground and effectively isolated from the rest of the system.

Conversely, when a Helical spiral wound single layer resonator has one *end* connected to a ground plane, the Fres responds by *shifting* to the Lambda/4 resonant point. ie; Tesla Coil............
This is also covered in the attached doc.

"1) A free coil, i.e., a coil without connections, has its fundamental resonance when the wire length is λ/2 (where λ is the electrical wavelength). When one end of the coil is connected to an infinite ground plane, the fundamental SRF occurs when the conductor length is λ/4. The removal of the impedance discontinuity at one end effectively doubles the length of the single-conductor transmission line."

"When an impedance is connected in parallel with a coil, the impedance terminates the transmission line. The coil behaves as a short-circuited two-wire line of half its conductor length, which is the same as a one-wire transmission line of length equal to its conductor length. A two wire line presents a high impedance at its terminals when its electrical length is λ/4, i.e., when the length of the wire in it is λ/2.

Thus when the line is resonated against a variable reference capacitor, the data extrapolated to zero capacitance point to the λ/2 wire length resonance (provided that the test frequency is not too close to the SRF). This is true regardless of whether or not one terminal of the coil is grounded, because the ground is not involved in resonating the coil. That grounding one end of the coil has very little effect on the parallel resonance of an LC network is easily verified by removing and replacing the ground connection (the small changes that do occur are due to stray capacitance)."

and

"The lowest self-resonance in the presence of a ground-plane occurs at approximately half the frequency of the parallel-resonant SRF. It cannot however be excited in the absence of a ground plane because it is the fundamental series self-resonance; i.e., a generator can only deliver energy to an impedance, and so a counterpoise is required to complete the circuit if the coil is to be seriesdriven.
Note however, that it is possible to excite multiple-internal-reflection resonances at approximate sub-multiples of the SRF25 (sometimes called sub-harmonics). One of these will be close to the lowest series resonance, but it will have a different field pattern."

In short, I find  the cited information interesting, because it does *support* Ruslan's claim of a *Free Space* lambda/2 @ 4Mhz for the grenade.  And you are correct when you mention that when *grounded* the Fres is much lower, ie; it should in theory be 1/2 of the Lambda/2 Free Space Fres == Lambda/4, which would put a Lambda/2 of 4Mhz
at 2Mhz when at Lambda/4, which is close to your 1.8xxMhz (factoring in phase velocity propagation delay) .

I like the looks of the spectrogram of the *new grenade* configuration that you posted today.  Looks to have a 16dBm or greater S/N (signal/noise) sensitivity over the next  closest resonant peak.

take care, peace
lost_bro

Hi LB,

thanks for the info and PDF, very nice data.

I measured my Grenade like i would measure an antenna using my SA and VSWR bridge.
Range from 9KHz to 20MHz, see the screenshot below.

The advantage is that one side of the coil is grounded, like it suppose to be in the Ruslan setup.
A whole new range of resonance points pops up  this way.

For what its worth,   video here:  https://www.youtube.com/watch?v=sqne9EesB9A

I will now wind an inductor (half length = 18.25m) in a bifilar way around the grenades lower part to check out its influence.


Regards Itsu