Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

Nick,

adding more turns to your kacher secondary will lower its frequency and increase its voltage
Which way to go is the big question as up till now all sorts of suggestions have been made concerning the frequency relation between the kacher and the grenade.
When i was playing with it, i aimed for a 1:1 relation, meaning 1.7MHz for the grenade (in resonance) and 1.7MHz for the kacher.


Concerning your Kacher MOSFET drive circuit you were looking for and somewhat related, i just recently was doing some test with a kacher being driven by a mazzilli circuit (2 MOSFETs).
The trick is to match the mazilli circuit resonance with the kacher resonance, which is normally fairly high for a mazzilli circuit.

I had to use some fast MOSFET's (irf530's) for my (resonance at 930Khz) kacher and lower the mazzilli capacitor to 1nF (good quality) as the IRFP260N's would not go there.
Even then the input current (at 12V) increased rapidly, so i guess the used gate resistors and protection diodes needs to be looked at too.
I don't think its worthwhile to go that way.

Regards itsu

[NickZ]

   Itsu:
   Thanks for the info.  Which way to go is still the big question. As I'm only guided by the brightness of my led indicator bulbs,
and the brightness of the incandescent bulbs, and the use of couple of meters, as well. However, I'm staying with this type of device, none the less.
   
   Now, as of about two weeks ago, even ALL my PlayStore Apps don't work. Such as the oscillotor apps, and frequency analyzer, sound oscillators, etz...  Since Goggle did an android update from 4.1.0 to 4.1.1   my android phone, and tablet, don't work with any play store apps, nor can I re-download them back, now. Even my Gmail, and Google don't work right, and can freeze up, at any time.
  Thanks,  Google....  NO new updates from them, to cure what they've done. And I'll need to re-root the tablet back 4.1.0, or forward to 4.1.2 to fix their update issue, and to be able to download Apps, once again.
There are thousands of phones, and tablets that are facing this problem.
  Ok, I won't bore you anymore about that.
   
    I may end up having to add more windings to my Kacher secondary coil, as without ferrite pieces inside the tube, it won't hardly fire up a CFL. I tried the recommended  18.5m size, but that just seams too short to see any real effect, at 12v.  I might also try 24v, or so, as that is one way to increase the frequency, I believe.  And also a great way to blow the transistors, or fets. Ha!

[starcruiser]

TO increase voltage increasing the length would do it, you could also change the wire gauge. The rule of thumb for winding Tesla secondaries is to do a 4 or 5 to 1 ratio of diameter to length for the form. So a 2" diameter form (PVC) would work best with a 10" coil wind (5 to1). The length. The voltage output of the secondary can be affected by the top load capacitance, which will also affect the operating frequency, so this is all a balancing act.

The primary drive voltage will affect coil output as well, so tuning the primary to the secondary is a requirement to improve power transfer, just be careful you do not want an exact match as this can cause feedback issues and cook the drivers (MoSFET's).

I would suggest you figure out the nominal operating frequency you would like for the coil and calculate the wire length (wavelength) and then use some simple geometry math to determine how long you would have to wind your secondary on a given form. You might need to do some trial and error to see how it works out but you should take care in winding your coil to ensure the winds are neat, this will reduce the inter-wind capacitance.

The pictures I posted prior of my coil used the calculated method I mentioned which put me close to the target frequency, I have not been able to get back to the bench (life gets in the way) to add the "antenna" (top load) to see how this will affect the operating frequency (it will).

This is why a scope is so needed for this stuff, as well as a sweep generator and a frequency analyzer would be beneficial.  All expensive stuff depending on what you get.

There are several spreadsheets available on the web to assist you in figuring this out, Google is your friend here. Look for Tesla coil winding guides. I bought a few books which provides the guidance as well.

[NickZ]

    Starcruiser:
   I've been trying to replicate the Akula/Ruslan second video device, and don't want to have to start at home base again. As I'm not trying to make a new Kacher, I'm trying to tune the one that I already have.  As these specific running frequencies are everything here, in order to see some positive results.
   The grenade coil is 37.5 meters long, and 168 turns, so the recommended Kacher secondary coil size is about 18 to 19 meters, of 19 gauge mag wire. So that both the grenade's 24 turn bifilar resonator coil (falsely called as it is really an inductor, and so is the 168 turns output coil), will be in sync, with the Kacher crt.  But, my Kacher circuit does not seam to be strong enough, nor at the right frequency to effect the grenade coils, in the best possible way.
   Therefore, which way should I go... concerning figuring out the proper frequencies for my device. 
   In anycase, I'll add more windings to the Kacher secondary, and up the voltage to see what happens.
   

[Bat1Robin2]

When i changed topload frequency would  increase when topload was made smaller. (smaller capacitor higher frequency makes sense) My range of experiments was from 1.2 mhz to 1.7mhz with only topload changes.  Better efficiency numbers with larger topload.