transformer replacement; problem with legs

Discussion in 'General Electronics Chat' started by sadiq3210, Jun 14, 2013.

  1. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
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    I have a device whose transformer is broken.
    This transformer has 6 legs; 3 on each side.
    Now i want to replace it.
    I took a similar transformer from a mobile charger.
    This transformer has also 6 legs but 4 legs on one side and 2 on other side.
    So, i can not connect it directly.
    Now i want to connect the transformer by using wires.

    Can you please tell me, where i connect each leg?

    If you want more information, you can ask.

    i attached a picture; the transformers look like that
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,974
    744
    You need to know the voltages of the transformer before you can swap it.
     
  3. gerty

    AAC Fanatic!

    Aug 30, 2007
    1,153
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    No picture shown.. Are you using all six connections on the old transformer
     
  4. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
    26
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  5. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
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    how can i tell you the voltages of transformer?
    there is no details written on transformer.
     
  6. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
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    tr.png

    for convenience, i made this. you can tell which leg in trtansformer A correspond to which leg in transformer B
     
  7. Ramussons

    Active Member

    May 3, 2013
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    What is this device? Can you post some photographs? Of both the component side and the pattern side? At least we may get some clue.

    Ramesh
     
    absf likes this.
  8. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
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    the device is a hair trimmer. i has two batteries of 1.2 V connected in series, it means a total of 2.4V.

    see the pics
    broken.jpg

    good.jpg
     
  9. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215

    Additionally, you will have to identify which leads are the Primary / secondary. Using wire beyond that leaves you with the issue of how to mount it in your equipment.

    It seems no two transformers are ever wound the same, unless you are into production of one item that only needs one design...
     
  10. Ramussons

    Active Member

    May 3, 2013
    557
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    Ok, that confirms that it's not a 50 Hz transformer but a a SMPS trasformer which will have a Primary, Secondary and a feedback winding.

    No, you cannot use the transformer from a mobile charger.

    A mobile charger also has a SMPS transformer with similar windings, BUT different Terminals, No of Turns, Polarity of windings.

    And the mobile transformer is wound for a 5 Volt output, you need 3 Volts.

    May be you can try for a replacement from the manufacturer. Else, you can do a rewind of the Mobile charger transformer with the same windings as the original and hope that it works.

    Ramesh
     
  11. szhighstar

    New Member

    Jun 26, 2012
    27
    5
    can you advise schematic of transformer?
     
  12. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
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    guyz. Is ramussons right?
     
  13. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
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    i can't. i m not an electrical engineer .
     
  14. absf

    Senior Member

    Dec 29, 2010
    1,492
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    Yes, I believe he is right :D

    Allen
     
  15. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
    26
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    now i want to join the broken transformer. i found the 3 terminals but where are the remaining three?
     
  16. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    If the equipment in question is old / used enough to break down in this manner, I would opt to simply replace the equipment with new, and cut my losses.

    Repairing transformers is an art, with very few artists :D
     
  17. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
    26
    0
    i want to make a new transformer. i broke the outer structure of broken transformer and i took the coil.
    then i started to open the winding, i unwraped a long wire and after that it finished.
    then i removed a green layer of plastic between the two winding.
    then i started to unwrap the inner winding. during unwraping the inner winding, i see that either the wire broke or it might be already cut and it was made up of two pieces of wire. I am not sure about that.
    then i unwraped it completely. now i have three pieces of wires. i'll tell u the length of these soon
    what you have to do is to tell me how to make new winding
     
  18. Ramussons

    Active Member

    May 3, 2013
    557
    92
    Now we know that the outer winding was the Secondary (output)
    Inside the Green Plastic layer, the Primary with a Feedback winding.

    I hope you noted down:

    The Coil Termination Lug Number,
    The Number of Turns,
    The Direction of Turns

    Ramesh
     
  19. sadiq3210

    Thread Starter New Member

    Jun 14, 2013
    26
    0
    no,t the same didn't.
    but i think that all the windings are wound at the same direction.
     
  20. Ramussons

    Active Member

    May 3, 2013
    557
    92
    We'll need to know the

    Number of Turns
    AND the
    Terminal numbers.

    An attempt can then be made to duplicate the transformer on another core.

    Ramesh
     
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