Kapanadze Cousin - DALLY FREE ENERGY

[stivep]

   NickZ , AlienGrey
I agree I'll do my best.

Wesley

[NickZ]

   NickZ , AlienGrey
I agree I'll do my best.

Wesley

  And I'll do my best to continue with this challenge.

  And thanks guys,  for your support.

[NickZ]

Nickz,
I guess your fets get burned by to high Vds peaks....this was in my TL start-up situatiion the case.
I would advise you for the timebeing to use some bigger snubber caps.......20-30nf.
So the Vds will stay below the 240V
Use your scope to monitor the Vds...as Verpies mentioned.
You wil see what happens while tuning the D/C pot.

Greetings

   Apecore:
   Funny thing but I got shocked by the driver circuit before the fet died. But, like I mentioned, the TL494 should provide an output to the scope, disconnected from the drivers, but it will only work to produce the signal that I showed with the scope connected to BOTH channels. The TL circuit won't work with the scope on just one channel, unless I connect the other scope ground probe on the other channel's ground. But, in any case the FETs overheat big time, unless the duty cycle is turned way down low. Before I could test one channel or the other individually, but not now.
   

[TinselKoala]

Hmmm... you checked to make sure the scope's trigger was set to the channel of the probe you are using, right? If so, then this might be due to a problem with the probe. Does it behave the same way with either probe? Have you checked continuity between the probe's ground clip and the BNC shield at the scope end?

[NickZ]

   TK:
   It's not the scope, or the channel trigger settings at fault. I have tried to swap the probes, etz... same thing.
The fets get hot very quickly. Apecore's fets don't get hot at all, using a similar TL circuit.
   Last night I found one more still use able IRFP260N mosfet, so now I have two fets working again, and I can show the scope shots that you requested, later today.  But, in any case there is practically no output at the bulb, or bulbs.  Similar to Itsu's last video, and results.
   Yesterday I worked 12 hours, at my normal job, and today it's going to be similar. So, I stayed up until 1am last night working on my circuits.
This has not been an easy fix, so far.  But, I'll get it going right. At least the duty cycle and frequency are working, to some degree, enough to continue testing the circuit.