Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

    Guys:
    Please remember to resize your attachments to less than 1200 pixels wide, (800 by 600 is better), or it will mess up this page, until the admin fixes it back to how it should be.
   
   What a guessing game this has all become....
   With no light at the end of the tunnel, yet?

   I was wondering how you were all doing, when running the Kacher on 24v or higher voltages, without frying your transistor.

[Hoppy]

Nice job Hoppy! Someone had to make a start on there! When you say 4.5A you mean mosfets plus kacher or just mosfets? Because with 69 Ohm to ground you probably consume there over 2A.

Jeg & all,

Since I made the last post, I have found that the Kacher biasing is quite critical. I've now increased resistance from base to ground to 470R. I was finding that with 69R, transients were being setup which caused instability with the push-pull PWM, causing one IGBT to get much hotter than the other. Changing the resistor value to 470R allows both IGBT's to run warm, not hot. I have around 2K between base and supply rail. Total current draw is now between 5.9A and 6.5A while the bulb is flashing. The antenna has become very sensitive to hand capacitance, causing the bulb to flash like seen on URFA's video. I'm not sure whether this is all going in the right direction but the antenna does now seem to be interacting strongly the inductor / grenade coils.

Edit: I have also found that my duty cycle is too high, so this is the reason one IGBT was getting much hotter than the other. There is always something that catches one out!

[Hoppy]

    Guys:
    Please remember to resize your attachments to less than 1200 pixels wide, (800 by 600 is better), or it will mess up this page, until the admin fixes it back to how it should be.
   
   What a guessing game this has all become....
   With no light at the end of the tunnel, yet?

   I was wondering how you were all doing, when running the Kacher on 24v or higher voltages, without frying your transistor.

Nick,

The transistor does get quite hot, thus the need for a good heat sink and fan. A high voltage rated transistor is essential.

[NickZ]

  Hoppy:
  I'm also running a 470 ohm resistor from emitter to base, and two 1k resistors in series on the base rail. But, can't get my new kacher to oscillate. I wish I knew what can be wrong,  I've already tried several different transistors, resistors, diodes, for this kacher.   I hate it when that happens... 

  I've posted this older video of mine, a couple of times before, but I think that there is something important on that previous build, concerning the feed back circuit on it. I have not been able to increase bulb brightness or output since then, even with my newer (correctly) rewound grenade/yoke core set up. As the grenade's voltage output is now higher, but the actual lumin levels on the bulbs is not as good as I had it then.
  https://www.youtube.com/watch?v=QbSJx91vtO4

[Hoppy]

  Hoppy:
  I'm also running a 470 ohm resistor from emitter to base, and two 1k resistors in series on the base rail. But, can't new my new crt Kacher to oscillate. I wish I knew what can be wrong,  I've already tried several different transistors, resistors, diodes, for this kacher.   I hate it when that happens... 

Nick,

Try reversing the primary coil connections. What is the code of the transistor you are using?