Kapanadze Cousin - DALLY FREE ENERGY

[NickZ]

  Hoppy:
  The heating issue is not due to the smaller heat sinks. I've tried bigger ones such as the motherboard ones, and they worked worse and is why I changed to using the smaller ones that can dissipate the heat sooner. Less than one half minute running is enough to blow my last fets, in last nights testing. Bigger heat sinks will not dissipate the heat in time before the fets blow, as they have more mass but take longer to dissipate the heat from the start. In any case the excess heating is not solved by heat-sink size, fans, or heat sink compounds, as there is way to much heat being produced for any heat sinks to keep up with.
   Itsu used Verpies lossless clamp design, but, he had produced a very poor output at the bulbs, similar to what I'm seeing now.
   Apecore is also now using Verpies lossless clamp system, and 50v input to his Kacher, but I don't really see any better results at his output, as yet. Considering that I can light the single 100w bulb with just my Kacher by itself running on 24v.

   What value capacitor should I try at the TL's pin 5? I'm currently using the recommended 102.
   
   I believe the problem may be in the yoke coils, or connections methods, as the TL494 is producing nice clean signals on its own, with the yoke connected, until I connect the Kacher. But, the heating issue is not due to the Kacher, as the fets will heat up even without the Kacher being on.

[NickZ]

 Bat1Robin2:
  I'll answer your questions later today, as I've got to go somewhere now. 
   My load is a single 100w bulb which works much better than the smaller value bulbs.
   The same yoke/grenade set up could light 4 100w bulbs using the Mazilli driver, and same Kacher circuit, same input source. Also showing a great sync from the Kacher to the grenade. Unlike this type of TL494 circuit.

[Hoppy]

  Hoppy:
  The heating issue is not due to the smaller heat sinks. I've tried bigger ones such as the motherboard ones, and they worked worse and is why I changed to using the smaller ones that can dissipate the heat sooner. Less than one half minute running is enough to blow my last fets, in last nights testing. Bigger heat sinks will not dissipate the heat in time before the fets blow, as they have more mass but take longer to dissipate the heat from the start. In any case the excess heating is not solved by heat-sink size, fans, or heat sink compounds, as there is way to much heat being produced for any heat sinks to keep up with.
   
What value capacitor should I try at the TL's pin 5? I'm currently using the recommended 102.
   

You are clearly pulling too much current. You could try heavier choking of the 24V supply to the yoke. I had this problem but managed to limit the pulse current with a suitable value high current choke. Have you got good duty cycle adjustment on the scope with the yoke connected and Kacher off? Don't run without a decent load on the yoke secondary.

102 (1nF) sounds about right to me for the right frequency range with a 100K pot, or 103 (10nF) with a 10K pot.

[apecore]

Bat1Robin2:
  I'll answer your questions later today, as I've got to go somewhere now. 
   My load is a single 100w bulb which works much better than the smaller value bulbs.
   The same yoke/grenade set up could light 4 100w bulbs using the Mazilli driver, and same Kacher circuit, same input source. Also showing a great sync from the Kacher to the grenade. Unlike this type of TL494 circuit.

Nick,
I don' t know if you can do or did it alteady but try to compare your mazilli Fet driver (gates) signals with the TL's.

Succes

[AlienGrey]

Nick,
I don't know if you can do or did it already but try to compare your mazilli Fet driver (gates) signals with the TL's.

Succes

Nick Appcore, Hoppy and all, Suggest you find out what the resonant frequency of your yoke is you will get far more out if tuned to the sharp gain spike you might need a scope and a capacitor or two. But feel free to ignore my ramblings !

AG