Akula0083 - studying replication (30 watts)

[Druida6970]

Hello. I am new to the forum and wanted to contribute what I am testing and seeking information too!

I set up the following circuit with the correct components as in the scheme: (Attachment)

https://www.youtube.com/watch?v=ZDATSi-dF-Y

See What happens, when I turn on the L2 coil, the voltage on the load LED is 7 volts and 10W panel LED does not turn on. When I turn off the L2 and leave only L1. the 10 Watt panel connects with strength and hitting the frequency TPU goes into oscillation.

But something is not ok. I'm still doing some tests. Any ideas on something that is not correct? Sera that have to make any changes?

The winding of the transformer is the following scheme: (Attachment)

[Druida6970]

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

Hello, I did some more tests, had placed one potentiometer 10K in regulating the duty circle and after analyzing realized that it does two functions, then put a right of 4.7k. Replaces also the Led TL494, who was a high brightness LED for a matte low power.

However analyzing the signal from the coil L1 realized that the potentiometer of 4.7k is not changing the duty circle, What did could be wrong?

Another thing that did not experience yet and will be the next step is to add the "shielded transformer". See the picture:

Any idea why the Duty Circle is not changing?

[itsu]

Hi Druida6970,

interesting effect you show in your video above, it seems that there are some oscillations ongoing after you disconnect the power input.

Make sure no groundloops occure via your attached probes.


Concerning your duty cycle question, a large group tried to replicate this setup 2 years ago, and i remember there were also some
questions about the way the duty cycle works, see this forum/thread and specifically this post:

http://www.overunityresearch.com/index.php?topic=2358.msg37771#msg37771

Lots of info there that you could scan through.

Please keep your pictures small so they won't mess up the forums format.

Good luck,  regards Itsu

[AlienGrey]

Hi Druida6970,

interesting effect you show in your video above, it seems that there are some oscillations ongoing after you disconnect the power input.

Make sure no groundloops occure via your attached probes.


Concerning your duty cycle question, a large group tried to replicate this setup 2 years ago, and i remember there were also some
questions about the way the duty cycle works, see this forum/thread and specifically this post:

http://www.overunityresearch.com/index.php?topic=2358.msg37771#msg37771

Lots of info there that you could scan through.

Please keep your pictures small so they won't mess up the forums format.

Good luck,  regards Itsu

Hi I tried messing around with this device I altered it a lot the 4k7 pot alters the voltage control  but pin 16 goes to 0volts also your talking about the dead time , you need another pot for that as i remember look at pin 4 and the data sheet as input mine in the bin as the circuit was just a mess, also the when the secondary was connected with the switch it would draw loads of current and lock up. Also one would think the 45 t winding would be the 3/4 wavelength and the 15 t winding would be the 1/4 wave output. But such is life.  Anyway good luck.

Look at this section http://www.ti.com/lit/an/slva001e/slva001e.pdf   and look at diagram 28  Vref DED pin 4  and ground.

Anyway how did you manage to get it to stay on so long ?

[Druida6970]

ok, I will reduce the next images.

itsu, changed the transformer to see the effect of curiosity. I put a transformer with two equal windings. (Model ELF410 of an old video tape of Panasonic).

I obtained a continuity in the resonance by 1 or 2 seconds. I do not know if someone already had a similar result but recorded to share here in the forum. In the oscilloscope signal is similar in the two coils (5 volt square wave), so retreat to the power (Duty Circle) increases rapidly from 58% up to 100%, when the oscillation for the TL494 and the LED turns off.

I will read the topic that gave me to update me with WHAT already been tried in the circuit.

I'm leaving the video, I will go deeper reading the topic that indicated me. See you.

https://www.youtube.com/watch?v=-KPYxl-Z1kM