Kapanadze Cousin - DALLY FREE ENERGY

[apecore]

  That is correct,  the duty cycle does nothing. The frequency trim pot does work as expected. 
   Should I change it as you suggested?
  Here is the circuit that I've been working on.  Can it be modified? As it's not too late to do so.
  l'll remove it,  once you see it.  As it's too large.
  Thanks again.

Nickz,
This circuit os working....i only use a 10k pot for D/C.

[Hoppy]

  That is correct,  the duty cycle does nothing. The frequency trim pot does work as expected. 
   Should I change it as you suggested?
  Here is the circuit that I've been working on.  Can it be modified? As it's not too late to do so.
  l'll remove it,  once you see it.  As it's too large.
  Thanks again.

Nick,

I've never had a problem using pin4 DTC for duty control. Try linking out the 12K resistor. You should get up to 45% with a fairly linear response between 0V and around 3.35V with 20% duty at the middle of the voltage range. There is a better way of doing it as Verpies suggests but to avoid messy changes to your board, I suggest you try and get the pin 4 duty control working properly.

[NickZ]

  That is correct,  the duty cycle does nothing. The frequency trim pot does work as expected. 
   Should I change it as you suggested?
  Here is the circuit that I've been working on.  Can it be modified? As it's not too late to do so.
  l'll remove it,  once you see it.  As it's too large.
  Thanks again.

  I can't remove the schematic, as the modify button is not showing up.  Please help,  so that the page is not messed up.
  I'll modify the duty cycle controller.

[verpies]

Should I change it as you suggested?

It's up to you but I can assure you that changes made to the TL494 controls will not affect the MO of the device.
In this video you can see how the TL494 works when it is controlled this way.

^{P.S.
If I were you, I'd connect pins 8,11,12 to the positive 12V rail of the power supply with separate traces/wires.
Also, for added speed and stability, I'd delete these 1K5 resistors connected to pins 9 & 10 and alter the neighboring 1K resistors to 330 Ohm.}

[NickZ]

   OK, first of all, sorry for messing up the thread. I can't remove or replace the schematic. Maybe the admin will do it.
   Makes me wonder what other errors that schematic may have, also.

   I have been very busy lately with work, 10 hours per day, but I will remove the 12k resistor and hopefully that will take care of the problem with the duty cycle part of the circuit. I can also replace the 20k trimpot, with a 10k pot, if needed, as apecore is using, by itself, without the other 12k resistor.
   I am using 3 watt 460 ohm resistors in the 9 and 10 pins, looks like some other diagrams are showing 10 ohm resistors, instead. And I am also using 1k to ground, after the 460 ohm resistors. 
  Thanks again for your help guys. Hopefully that will take care of the duty cycle issue, and I can continue installing the fet drivers and snubbers.