Akula0083 30 Watt Self Running Generator.

[JohnnBlade]

Hi All,

On the circuit of the lantern no3 there are 2 tl494 but why does 1 have
Pin 1 going to pin 16 and pin 16 goes to 13 and the other does not have that

And the other has
Pin 2 going to pin 15 and pin 15 goes to pin 14 and 13

The both have pin 8 going to pin 11 and pin 12

What does that difference do in the circuit?


Thnx!

Greets JB

[JohnnBlade]

  TK: 
  Can you also show us how "easy" it is to disconnect the input and show it self running.
  The corrected schematic may not be correct, as the leds still go out, and therefore not a working replication.
   If Akula is still not providing for a true working schematic, how do you know that the corrected schematic is correct?
  Maybe try different types of cores, of that design, if you think that the core is the problem.
  Akula has used many different types of cores, and obtained the shown results.
IF true.   Are they all those different cores special?  Nor has this been proven, either. But, he did point out that the smaller sized yoke did NOT work on his first device. So, not all yokes work the same for that purpose, and possibly the same with the smaller transformer cores of the low voltage circuits.
  In any case, good luck with your tests... I know how frustrating this can all be.

I dont think you would need a schematic for the lantern no 3, since all info you have is on the board.

Count all the holes in the board, every section has 5 by 5 holes in it in sections.
The when akula turns his board around you can see al the solder lines, just follow then and coordinate them.

Take piece of paper with small squares, and draw the solder lines first matching every square on the paper with a hole on the board. Then turn that paper around and draw the components, then when holding the paper in  light so you can see the back true the front side and yll get all paths and components.

Just take small time to reverse engineer as much as possible instead of checking to many circuits.
Once you have yr own circuit you can compare against other circuits and see which matches the most.

Or just try to build it yrself and test the hell out of it

Greets JB

[TinselKoala]

@TinselKoala,

Can you share schematics, and or video and explanation...

Thanks.

Sorry, I guess I posted all that stuff in the other "3V" thread. I didn't mean to take you off the topic. I haven't yet built the circuits you are mostly talking about here.
All my work is covered in the other thread, schematics scopeshots videos etc.

[TinselKoala]

@starcruiser

Thanks for your reply. No the probe X setting are OK at 10X since both probes have that small autodetect pin so the scope sees them OK.

When I connect both probes and grounds to the same frequency generator output, under 10KHz both show almost the same waveform with Channel B slightly off square wave and Channel A is showing a good square wave.

But as I go up in frequency ChA will show 100vpp while ChB is showing maybe 15vpp. But both are on the same signal. When I switch the probes, the same ChB does the same problem so it is not my probes. I checked everything I can but nothing.

You are seeing 100 v p-p from a frequency generator output? Perhaps it's the Channel A that's bad, not B.
What happens when you turn the probe's adjustment capacitor? What happens when you change the channel couplings? Can you confirm that the scope is autodetecting the probe attenuation... check the actual channel settings in the scope....
Can you show some scopeshots?

My scope is a HP 54645D.

Nice kit, I wish I had one. Best of both worlds, digital and analog. Probably impossible to fix at the component level, though, unless the fault is real and really simple. First let's confirm there is a fault in the scope and not the probes or the .... er..... end user.

It's kind of starting to piss me off royally since I cannot count on the ChB to make true comparisons. This does not however hinder my experimenting, but just a major main in the but. Especially when I want to make a youtube video to show you guys but the scope is not giving a reliable ChA/Chb comparisons.

wattsup

I feel your pain, bro.

ETA: I had similar symptoms at one point but it turned out to be the probe's tip resistor.... but you have eliminated the probes as a cause of the fault.... haven't you? Double and triple check....

[TinselKoala]

I dont think you would need a schematic for the lantern no 3, since all info you have is on the board.

Count all the holes in the board, every section has 5 by 5 holes in it in sections.
The when akula turns his board around you can see al the solder lines, just follow then and coordinate them.

Take piece of paper with small squares, and draw the solder lines first matching every square on the paper with a hole on the board. Then turn that paper around and draw the components, then when holding the paper in  light so you can see the back true the front side and yll get all paths and components.

Just take small time to reverse engineer as much as possible instead of checking to many circuits.
Once you have yr own circuit you can compare against other circuits and see which matches the most.

Or just try to build it yrself and test the hell out of it

Greets JB

Did you notice that two, but not all, of the potentiometer cases are soldered into the circuit? Why do you think that is? Why do any, or why not do all.... ??