Kapanadze Cousin - DALLY FREE ENERGY

[MenofFather]

Sorry guys I am bothering you again with the push - pull but, should I suppress BEMF of the coils   I am thinking to put between central tap and both other end of the coils some diode. Also between the Gate and the Source 10Kohm resistor and small neon to give it some protection.   Isn't it in some way contra-productive to the functionality of that device?

I using IRFZ44N or similar and not using any protection and good, they not burning.

[Hoppy]

Hi John. People are using snubber circuits to reduce the BEMF spikes and ringing.
You can maybe check with Itsu or Hoppy to see what they are using, although I think they
have posted that info already in this thread a while back.
All the best...

I'm currently using 10nF (600V) in series with 4R7 resistor (5W) and parallel diode snubbers. I suggest that John tries a resistor values in the range 4R7 to 15R. Snubbers will consume considerable power. I tried TVS diodes / Schottky diode combos across both half of the primary windings but found that CR snubbers more effective. The most important thing is to get the leading edge spike down under the max voltage rating of the mosfet / IGBT.

[Hoppy]

I using IRFZ44N or similar and not using any protection and good, they not burning.

With VDS at only 55V you are lucky!

[T-1000]

  Hoppy:
  I can't remember just where it was mentioned that the superimposition should be DC from the HV pulser, to the magnetic induction coils (12,12, or 25,25, turns). 
   Maybe T-1000 knows, or remembers. In some of the older videos, perhaps.

I can't remember either, sorry. Only mixing two input signals in 2 input coils, not playing much directly on the wire..

Sorry guys I am bothering you again with the push - pull but, should I suppress BEMF of the coils   I am thinking to put between central tap and both other end of the coils some diode. Also between the Gate and the Source 10Kohm resistor and small neon to give it some protection.   Isn't it in some way contra-productive to the functionality of that device?

One thing I learned about BEMF - if you suppress it you make short circuit on the coil and create undesired effect when it goes back to initial state. It is much better to use it for recovery or charging capacitors in series... My personal preference is to let coil oscillate freely and in primary coil side I am adding blocking Shotky diodes in series to protect transistor...

[skywalker66]

Hi Nick and everyone !

About DC HV positive pulse upon induction coils it seems you get it right.
Ruslan use those HV positive pulse too, interposed on induction coils, but he don't put diode on HV side on kacer, but between negative side of kacer and earth ground (cathode of diode on negative of kacer, and anode of diode to earth ground), which made only positive DC pulse on antena related to earth ground. But for that, negative side of kacer neither of push pull must not be connected directly to earth ground, the only one connection between the two is by means of that diode.

For detail please take a look at the kacer schematic hand-drawn by Ruslan itself in one of his vids.

Also care be taken because those 24V power supply have internal capacitors Y type (2.2, 3.3NF or such) between input side 220V and negative output, and/or have negative output connected to ground internally, those must be removed in our case. Output of 24V power supply must be completely isolated from input side.