Kapanadze Cousin - DALLY FREE ENERGY

[lacphong]

Hi NickZ,
Thank you for the information, I'm already aware of what you said below.  The speaker wire that I'm using is a 14 awg, which is equivalent to the solid wire, it's more flexible.  But the characteristic of the wire like quality of the copper and the insulation, will affect the final resonance frequency of the coil.  So using the same wire size and length does not guarantee that I will get the correct resonance frequency I need.  That's why I think it's very important to know the desired frequency, that way I know what to look for, maybe I will just have to trial and error... I also have to agree with magpwr that I don't buy what Ruslan have to say, there always seems to be something dubious about that guy... 

From what magpwr said, I'm thinking that the natural resonance frequency of the grenade coil need to be one of the bifilar coil harmonics frequency, that way the low frequency from the bifilar coil will line up with the higher harmonics frequency of the grenade coil, like in one of Akula's video.  So if the bifilar coil resonance is 18khz, the grenade coil will need to be 54khz.  This is the part where I got confused. 

I don't understand why in the video, Akula find the resonance frequency of the coil, then used a spectrum analyzer to find the third harmonics frequency while he can do that mathematically.  There could be something more to this part, he had to do some searching in the spectrum analyzer to find the harmonics frequency, but I don't understand Russian, so I can't figure out what he was talking about yet... LOL

  Ok, well you can start by watching this video (below).
  Wind your grenade output coil first, 37.5 meters long, onto sink drain pipe. There is no further tuning on it needed.
   Don't use speaker wire of something other than the recommended wire type and gauges.
  Follow the directions on making the grenade's bifilar induction coil 1/2 the size of the output coil, or 18.75 meter.
Be as exact on making these coils, their wire turns and direction of those turns, as you can be. 
   Make a Kacher circuit, start with a simple one. Make your Tesla coils, primary and secondary,  Connect the secondary to the "antenna coil" through a ferrite choke.
  See if you can light a small 10w bulb, at the grenade's output coil. 
  There are lots of videos to watch, also, as well as lots of discussions here. So, get up to speed, so that you are well informed.
and don't have to do anything "blindly".  As that won't work.
  Ruslan's older videos can be some of the better videos to watch, and study. As they are simpler to try to replicate.
  Example: TopRuslan 13. 
  https://www.youtube.com/watch?v=eFVsXUsn4Uo
     
   https://www.youtube.com/watch?v=bedLP_SOHoo   

[verpies]

.

[AlienGrey]

Yes, but these are not the most optimal configurations.  Also optoisolators are not the best choice for high performance designs nowadays (they have limited working hours, too).  Modern isolated gate drives make them obsolete in high-speed applications.
That's only an illusion because P-ch MOSFETs have roughly 3x higher R_DS-ON and are more expensive and less available.  Also the resistors in the gate voltage divider will need to be high power ones for a 300V secondary supply.  These resistors have to be special non-inductive power resistors and they will heat up strongly, too.
Last but not least, the gate voltage divider will not be able to charge and discharge the gate very quickly so the switching speed will be limited. 
It is worth to mess with all those separate grounds and isolated supplies because that leads to a high-performance universal MOSFET driver that comes handy in many projects (not just this one). 
IMO it is a solution to 90% of problems appearing in FE power switching circuits tried here.

Such driver is very robust (it protects the MOSFETs and doesn't break easily itself). It is immune to HV interference, easy to drive from 5V logic chips and extremely flexible.  It's not that complicated either. 
Its major disadvantage is cost, ...but it is money well spent.

The major cost contributors are the isolated DC-DC power supplies ( see here and here ). 
If your time is cheap, you can save money by building your own instead of buying ready ones, but that requires winding your own ferrite pulse transformer and some skills.  I could help you with the latter if you'd like me to.

Below are three schematics that incorporate two N-ch MOSFETs to make a universal high-speed bidirectional switch.
Note, that the most expensive one (depicted in Diag.3), nullifies the evil Miller effect, that is the major cause of MOSFET's slow downs and spurious turn-on_s due to high dv/dt pulses appearing on the drain.  Gate charge energy recovery is possible, too!

Your dead right about Led GalSi opto's they get hot and crack but I was a bit confused on what you had invented but I think your talking about HI side Low side Driver chips, like IR2113 family and 2 N-channel Power output stage Fets. They still blow up though but you can do a circuit that limits the current flow in the Fets but it has to be dead quick.

AG

PS It would be great if can you come up with a circuit for that ?

[forest]

Yes, but these are not the most optimal configurations.  Also optoisolators are not the best choice for high performance designs nowadays (they have limited working hours, too).  Modern isolated gate drives make them obsolete in high-speed applications.
That's only an illusion because P-ch MOSFETs have roughly 3x higher R_DS-ON and are more expensive and less available.  Also the resistors in the gate voltage divider will need to be high power ones for a 300V secondary supply.  These resistors have to be special non-inductive power resistors and they will heat up strongly, too.
Last but not least, the gate voltage divider will not be able to charge and discharge the gate very quickly so the switching speed will be limited. 
It is worth to mess with all those separate grounds and isolated supplies because that leads to a high-performance universal MOSFET driver that comes handy in many projects (not just this one). 
IMO it is a solution to 90% of problems appearing in FE power switching circuits tried here.

Such driver is very robust (it protects the MOSFETs and doesn't break easily itself). It is immune to HV interference, easy to drive from 5V logic chips and extremely flexible.  It's not that complicated either. 
Its major disadvantage is cost, ...but it is money well spent.

The major cost contributors are the isolated DC-DC power supplies ( see here and here ). 
If your time is cheap, you can save money by building your own instead of buying ready ones, but that requires winding your own ferrite pulse transformer and some skills.  I could help you with the latter if you'd like me to.

Below are three schematics that incorporate two N-ch MOSFETs to make a universal high-speed bidirectional switch.
Note, that the most expensive one (depicted in Diag.3), nullifies the evil Miller effect, that is the major cause of MOSFET's slow downs and spurious turn-on_s due to high dv/dt pulses appearing on the drain.  Gate charge energy recovery is possible, too!

Seems that all such solutions require active powered isolated gate drives ? How much slower is the one without the active power but with photoelectric effect inside gate driver ?

[NickZ]

   Lanphong:
   The coil winding ideas and specs come from Kapanadze, replicated first by Akula, then simplified and re-replicated by Ruslan, and now by some other guys, also.   Each one is showing totally different running frequencies. So,... who will you trust???
   
   As I see it, the main resonant coil is the grenade's 37.5m output coil, which needs no tuning if made to correct specs.
The grenade's inductor coil/yoke coil LC circuit and push-pull is adjusted to best sync and provide the highest gain with the grenade output coil, not he other way around. The Kacher is then tuned by adding or removing turns. Then the tuned Kacher is made to sync with the 3t coil/grenade induction coil circuit, once that induction circuit has also been previously tuned to the grenade output coil.  The grenade output coil will be running at that same frequency as the Kacher induced/ grenade induction coil, when the power is switched on.
  The amplification "effect" is noticed when the Kacher's output is added to the induction circuit's output. Or not noticed.

   Your trial and error method...  Might be the best way to go, in any case.
   
   We are mostly trying to replicate the Ruslan type of self runner, as in the video TopRuslan 13.  As that is the simplest way to go, so far. And so far, it's been working out to the degree that we've taken it.  Looping is the next big step.