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Author Topic: Kapanadze Cousin - DALLY FREE ENERGY  (Read 11717935 times)

itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17370 on: June 11, 2017, 11:42:57 AM »

Nick,

i have to agree with both Hoppy and verpies.

It just looks like you loose the sync, but you have to try to fix the scope first.
Then like verpies mention put it to DC coupling as it is now in AC coupling for both probes.

If you loose the sync again while turning some pots, just adjust the triggering level point to obtain a new steady signal (you might need to increase the vertical settings)

You show just scoping the TL494 outputs, please when you have fixed the scope, also try to probe the gates and the drains and even a combination of gate / drain one by one.

The new filters (chokes / caps) look great and should filter out RF to a great deal.

Regards Itsu

verpies

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17371 on: June 11, 2017, 01:04:12 PM »
The new filters (chokes / caps) look great and should filter out RF to a great deal.
The electrolytic caps might be inadequate for filtering higher frequencies.
If scoping across these caps shows HF components, then soldering some lower capacity film capacitors across them will remedy that.

AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17372 on: June 11, 2017, 01:18:46 PM »
The electrolytic caps might be inadequate for filtering higher frequencies.
If scoping across these caps shows HF components, then soldering some lower capacity film capacitors across them will remedy that.
is this what your looking for ?

Before any bright spark asks me for the secret, I have two other modules and they won't play along active components are in sockets and it's not them but appears to be related to the driver output stage and torrid capacitor and grenade, with no EHT stage or load supply voltage, is 14.5v at 4 Amps. at 17.8khz approx

NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17373 on: June 11, 2017, 04:46:29 PM »
  Verpies, Hoopy, and Itsu:
  Ok, thanks for your comments.
  The AC or DC switch on the scope is not the cause of the problems with the signals, as I've tried them both ways, and the problem persists, just exactly the same.
   I'll get the scope fixed as soon as I can, but I've talked to the all the Tv repair guys in my area, and no repair shop will help me out on it. But, the scope is working for what I need it to do, at this point. Which is to get the TL board working without messing up the signals when turning the pots. It's blurry but it's working well otherwise. Sorry it bothers you, it bothers me too.
   When the scope sees bad signals, there is no output at pin 9 or 10 of the TL494. That IS the problem. Which I've had even from the start of this board. So, I doubt that it's the trim pots causing it. But, I'll replace them (again) anyway, just to be sure, as I don't know what more to try.
  I've replaced just about everything, several times, including the TL494 IC, UC4420 fet drivers, resistors, caps, etz...
 
   The filter caps should be doing their job, as well. As I have not only the bigger electrolytic 1000uf caps, plus a 104j caps, on the both sides of the voltage regulators. As well as a 0.1uf caps between the positive and negative of the TL494 IC, and also on the UC4420 fet driver circuit. So, that part should be ok. I hope.

   The scope signal can get much worse than what I showed on that last video. On the video they were working fairly well, compared to what they do at other times.
   I will replace both trim pots, the (20k and the 50k), just in case that they are damaged. I have tested the pots out of the circuit and they were working well throughout their ranges, though. We'll see if that takes care of the issues, but somehow, I doubt it.
  I did see something similar happening on one of Itsu's videos, and I thought I'd ask to see if anyone else has experienced that same kind of thing happening on their device.

itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17374 on: June 11, 2017, 05:38:54 PM »

Nick,

to me, the video shows a perfectly good working TL494.
Not sure what you mean with "When the scope sees bad signals, there is no output at pin 9 or 10 of the TL494. That IS the problem"
I do not see anything like that happening, just some times where you seem to loose the sync for a short while.

So you need to make it more clear to us what exactly is the problem.
We do know now that as you are running without the yoke, its a problem in the basics of the TL494 circuit.

I always had to work with the max. duty cycle (45%) for the yoke to present the correct resonance signal, so keep it at max (45%).

Make sure to put / have a 0.1uF ceramic cap directly across the TL494 (and uc4420) plus / minus leads, preferrable directly across the chips leads.

Itsu

verpies

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17375 on: June 11, 2017, 06:27:43 PM »
The AC or DC switch on the scope is not the cause of the problems with the signals
Are you sure you are not confusing AC input coupling with AC trigger coupling?
https://www.youtube.com/watch?v=y5aAjd9YPok

Not sure what you mean with "When the scope sees bad signals, there is no output at pin 9 or 10 of the TL494. That IS the problem"
I do not see anything like that happening, just some times where you seem to loose the sync for a short while.
Neither do I.

I'll get the scope fixed as soon as I can, but I've talked to the all the Tv repair guys in my area, and no repair shop will help me out on it.
You don't need these guys.
Just do it yourself by following TK's excellent instructions.
If you send him a still photo of the focusing knob's innards he might even highlight stuff for you.

verpies

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17376 on: June 11, 2017, 06:32:26 PM »
is this what your looking for ?
Without the description of the probe positions and load characterization, it is difficult to say.

Hoppy

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17377 on: June 11, 2017, 08:08:17 PM »
 
   When the scope sees bad signals, there is no output at pin 9 or 10 of the TL494.


How did you prove that?

NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17378 on: June 11, 2017, 09:31:19 PM »
  By connecting my volt meter between the pin 16 and pin 9 or pin 10. I should get 5v out when the TL494 is working normally. But I get 0v at those pins when the scope signals are messed up. I doubt that the duty cycle or frequency pots are at fault,  but I'm not sure about that.

AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17379 on: June 12, 2017, 01:48:05 AM »
  By connecting my volt meter between the pin 16 and pin 9 or pin 10. I should get 5v out when the TL494 is working normally. But I get 0v at those pins when the scope signals are messed up. I doubt that the duty cycle or frequency pots are at fault,  but I'm not sure about that.
Nick Whats on pin 3? and have you got 12v on pin 11&12 and is pin 1 & 16 at 0v ?

Also have you got 4.5 volts on pin 2, 15, 14, 13 ?    and can you vary the volts on pin 4 between pin 4.5 v and 0 ?

also put your scope probe on pin 5 and see if you have any waveform then see if you can alter it with the pot on pin 6
'


NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17380 on: June 12, 2017, 03:32:19 AM »
   I can get normal readings, such as in your questions, but, at times I can't.. As it can happen at the right duty cycle and best frequency and most optimal controller settings, is just where I sometimes have the messy bad signal problem. And believe me, there is a problem some where, and my guess is that it's the duty cycle circuit that is unstable. And when it fails, the whole device fails, by blowing the FETs, and overheating them. But I've made some changes, So, we'll see if there is any reduction of the FET and choke overheating still, or not.

 Pin #3 is left unused, on this TL version. 12v at pins 8, 11, and 12.  4,90v on pins 9 and 10, when working properly,
Pin 13,14,15. 4.75v. Both pin 4 and pin 6 can be varied in voltage by the 20k and 50k trim pots. As I remember, from today's tests. Ground is on pin #1, 16, and 7. As in the pinoytech diagram that I've previously posted.
  Right now my rig is being put back together, but,  I'll post some voltage readings from the  TL494 IC, when I can.
 


AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17382 on: June 12, 2017, 01:34:31 PM »
   I can get normal readings, such as in your questions, but, at times I can't.. As it can happen at the right duty cycle and best frequency and most optimal controller settings, is just where I sometimes have the messy bad signal problem. And believe me, there is a problem some where, and my guess is that it's the duty cycle circuit that is unstable. And when it fails, the whole device fails, by blowing the FETs, and overheating them. But I've made some changes, So, we'll see if there is any reduction of the FET and choke overheating still, or not.

 Pin #3 is left unused, on this TL version. 12v at pins 8, 11, and 12.  4,90v on pins 9 and 10, when working properly,
Pin 13,14,15. 4.75v. Both pin 4 and pin 6 can be varied in voltage by the 20k and 50k trim pots. As I remember, from today's tests. The ground is on pin #1, 16, and 7. As in the 'pinoytech' diagram that I've previously posted.
  Right now my rig is being put back together, but,  I'll post some voltage readings from the  TL494 IC, when I can.
 
Hmm! I don't suppose you have used the circuit with the 'dead time control' I found that only worked with the pulse width turned right down, and then if the pot was too close to the 4.5v the chip would shut down!  my advice is do not use it just takes up space and overrides the pulse width control, to do this I removed the pot a connected the wiper leg to 0 volts. Modulation only needs to be around 45 % no more.


AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17384 on: June 12, 2017, 09:18:55 PM »
Thanks for summarize this topic Saturnoi.

Still reading and hoping we can continue this path.
Unless i see Itsu spend many hours and has done a lot of testing and posting no clear result came out.

regards
Living in hope someone else finds the answer, what if meant suppose? well, what about the word assume? Is your device built differently or perhaps? you put one extra turn on a coil or the yoke had one extra 100 grains of FerroX compound?

Why not break it down and get the maximum out of what your building and now waste a drop of development fluid? look again at your driver and yoke or toroid tune it for maximum and does it's impedance match the grenade?

Regards AG