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Overunity Machines Forum



Kapanadze Cousin - DALLY FREE ENERGY

Started by 27Bubba, September 18, 2012, 02:17:22 PM

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NickZ

#17170
May 03, 2017, 09:35:45 PM
  The 1000 ohm resistors from pin 9 and 10 to ground are still connected.  The scope is connected to the ground resistor, only, to the ground side of that 1000 ohm resistor, and to the other side of that same resistor which is connected to pin 9 or 10. I've shown how this works this way,  only disconnecting the 1000 ohm that go to the drivers. 
   The TL's connections look OK, no shorts or loose solder points that I can see. This happened while the circuit was running. The problem may lie at the trim pots, perhaps. As it happened while I was tuning with them if I recall correctly.
    Here's a scope shot of pin 13 and ground (ground from pin 1 and 16). It's a mess alright...scope probes are on channel 1.

NickZ

#17171
May 03, 2017, 11:56:16 PM
  OK,  I think that I found the problem,  a possibly faulty electrolytic capacitor C2, a small 4.7uf cap on pin 2 of the TL494. I'll replace it out tomorrow, and see if that takes care of it, as it's late here tonight. Thought I'd let you know, but, in any case I'll know more tomorrow night.

NickZ

#17172
May 12, 2017, 03:27:01 PM
   Verpies, TK, and All:
   I'm still having problems with my new TL494 circuit board. Sorry to say...
   Below is a video that I just posted, showing the scope signals on the GATES, (not the drains as I had mentioned in the video).
   No matter what I do, the fets still overheat when they are mounted, and also the signals get real messy when the Kacher is on.
   Let me know what you think, and any suggestions that may help. As at this point, I don't know what else to try.

   https://www.youtube.com/watch?v=mkneiHEU3aU

Ed morbus

#17173
May 12, 2017, 03:47:26 PM
Nick Zec is your Left big capacitor defect ?

T-1000

#17174
May 12, 2017, 06:58:18 PM
Quote from: NickZ on May 12, 2017, 03:27:01 PM
   https://www.youtube.com/watch?v=mkneiHEU3aU

What are signals on gates without yoke windings attached?

Also the overheating is usually caused by internal diodes of mosfets when getting lots of BEMF. I noticed you are still using center tap winding for the primary which is main source of that problem. If you make bifilar winding instead and have begining of both coils going to mosfets and ends of both coils going to the power supply the BEMF will be reversed to the positive side and will stop messing up with mosfets diodes.
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