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Hello!

I don't seem to be able to get power through my flyback transformer (or actually, I'm not sure what the power isnt going through.)

I used copper wire for the primary windings (Do I HAVE to use magnet wire for this to work? - If so I understand what my problem is.)

And slightly smaller red copper wire for the secondary windings.

I am using this http://pdf1.alldatasheet.com/datasheet-pdf/view/16901/PHILIPS/BU2520DF.html transistor 

But also have a few others I could use. Have tried another one, (can't recall the name at the moment, but had the exact same problem.)

I have tried to switch the cables around etc like suggested in https://www.instructables.com/id/2n3055-flyback-transformer-driver-for-beginners/?ALLSTEPS

Also, I am unable to hear any high pitched noise.

I am currently using a 12v car battery. (And it has power on it, at least enough to run a rather big DC motor.)


As you can see on the pictures, my ability to connect things neat and clean is non-existent. - And I do apologize about that.

And the pictures are horrible, as I'm not quite sure what you might want pictures of.

I'm not quite sure what else I can ask.. I have tried another source of power. And it has the exact same problem. 

The flyback transformer is from a CRT PC monitor. Same with the transistor.

I've also tried another transistor that I got from a PSU for a computer. and it still has the same problem. 

I have checked the cables and I know that there can go current through them, tried it in another circut.

I was also wondering if the resistance could be broken. At this moment I don't have a multimeter close by so I don't know how to test it. 


I used copper wire for the primary windings (15 windings)

And Red copper wire (If this has another name and my ignorance is shining through, I am sorry.) for the feedback windings (11 windings)

Are the windings just completely wrong? 

My feedback wire is slightly thinner than my primary wire as well.

Check the comments for picture of circuit diagram and a look-a-like of my primary winding copper cable.


And I hope I can get other replies than "Buy a multimeter you silly git!" - Yes. I will, eventually. 

If required, I can upload the pictures to another host so you can view them in a much higher resolution.



Edit : Added a few more hopefully helpful pictures, since the first ones were utter crap.

Please let me know if there is anything else I need to get better pictures of. 

Also, I removed the on / off button from the circuit now as one can see on the latest added pictures.


Thanks for your attention.


Zaek.



lemonie5 years ago

What have you done here, you have two transformers strapped together with red-tape?
Can we see a nice clear circuit-diagram?
What did you wind with the copper wire, and how many turns of each?

L
Zaek (author)  lemonie5 years ago
What? No. I can remove the tape and try to get better pictures. Again, I do apologize about the horrible pictures.

I've added a hopefully useful circuit diagram

What did I wind with the copper wire? Am I missing something here?

I used copper wire for the primary windings (15)

And Red copper wire (If this has another name and my ignorance is shining through, I am sorry.) for the feedback windings (11)

Are the windings just completely wrong?

My feedback wire is slightly thinner than my primary wire as well.

Hope some of this have made things a bit more clear.

Thank you
Circuits.pngcopper_wire__21957_zoom.JPG
lemonie Zaek5 years ago

You've re-wound a transformer and it's not working?
Were you working to a design or someone else's project? (I'm trying to understand the construction, 15 coils on the primary sounds a bit too few to me)
similar type-circuit

L
Zaek (author)  lemonie5 years ago
http://www.youtube.com/watch?v=w8d0GorQmrY More or less following this project.

https://www.instructables.com/id/2n3055-flyback-transformer-driver-for-beginners/ or this, if you'd prefer a link to the site.

They are the same projects only with different transistors yeah?


Sorry if I am not making any sense.

My knowledge within this is rather minimal, but i'm learning more and more everyday. :)