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Is It A Transformer 220vac-110vac ?

Discussion in 'General Electronics Discussion' started by itai shi, Jul 22, 2016.

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  1. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    hi guys,

    i bought a transformer to get 110VAC of 220VAC,
    what i got is a this product in the picture,

    the coil has 3 wires,
    all connected on same coil.
    between 2 grey wires i have about 175 ohm,
    between each grey wire to red wire i have 85 ohm and 73 ohm.

    and it also have an A/B switch so you can change the input and output (220-110 to 110-220)

    could this transfomator could do the job?
    it look a little bit fishy....not?

    thanks,
    itai.
     

    Attached Files:

    Last edited by a moderator: Jul 22, 2016
  2. davenn

    davenn Moderator

    13,381
    1,784
    Sep 5, 2009
    hi there

    having only 3 wires, I suspect it's an auto transformer ... ie there is no separate primary and secondary windings
    just a single winding that is tapped and depending on the switch setting you can have 220-240 in 110 - 120 out or 110-120 in and 220 - 240 out
     
    itai shi likes this.
  3. BobK

    BobK

    7,660
    1,675
    Jan 5, 2010
    Yep, I think Dave nailed it.

    I cannot be sure of the size since there is nothing to compare to, but it looks like maybe the transformer is 4 cm across. If it is this size, the power it can handle is pretty low, maybe 100W at most. What is it rated for?

    Bob
     
    itai shi likes this.
  4. dorke

    dorke

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    Jun 20, 2015
    Like Dave said it is an auto-transformer.
    It will work but the build quality is horrible,it doesn't look like a safe device.
     
    itai shi likes this.
  5. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    i pretty agree that it isnt a safe one...
    and probebly it is an automate one (like you and dave said)

    but the fact is that its not functioning at all )-:

    220VAC gets in,
    220VAC gets out....

    how can we explain that ?

    and like bob mentioned,
    it suppose to give 52W so i guess the size is ok?
    (its is 4cm)
     
  6. dorke

    dorke

    2,342
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    Jun 20, 2015
    The explanation is somewhat strange.
    It looks to me like it isn't wired properly !
    Please verify this diagram I made.
    With the N going directly from in to out not feeding the transformer it can't work.

    trans3.JPG
     
    itai shi likes this.
  7. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    dorke,
    after you mention the wiring , i must mention that one of the wires was disconnected when i opened it,
    it is showed with the yellow cycle on the picture (Wire G1 that you pointed)
    i assumed it suppose to be connected where it is now,
    but you say the N is the problem, not G1 ?
    as i understand the diagram in your post is the actual wiring, not the ideal one ?!
     

    Attached Files:

    Last edited: Jul 22, 2016
  8. dorke

    dorke

    2,342
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    Jun 20, 2015
    Well just move wire G1 and connect it together with N.
    It should solve the problem. like so:

    trans3-modified.JPG
     
    Last edited: Jul 22, 2016
    itai shi likes this.
  9. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    thanks again Dorke,
    sorry for not mentioning this important thing in the begining.

    i'll try it tonight.
    (and also will try to understand the sense of it.)
    you are awesome !!!!

    by the way,
    is there any way to make it more safe ?
    like put some glue on it ? Epoxy ?

    thanks,
    itai.
     
  10. Sunnysky

    Sunnysky

    465
    115
    Jul 15, 2016
    that should fix it. WTG dorke.

    Nameplate indicates transformer can operate with 70W load. That is dictated by temp rise in hotspot and assumes linear resistive load, not a light bulb, nor a motor or a bridge rectifier with large Cap load to a power amp. In these cases derate by 1/3 to 45W.

    The brokn wire indicates a process design weakness. Hot glue or polyurethane tube adhesive over soldered wires to restrain from vibration and stress of closing it.
     
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  11. dorke

    dorke

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    Jun 20, 2015
    It will never be a truly safe device,but you can improve it a little:
    1. Shorten the bare wires in the solder joints to minimum(now it looks like 2-3mm).
    2. Re-solder without excessive solder(prevent does "humps").
    3. Use RTV non-conductive sealant around and on the solder joints to glue and better isolate.
     
    itai shi likes this.
  12. Sunnysky

    Sunnysky

    465
    115
    Jul 15, 2016
    to further protect from line surge voltages of 3kv. add cct breaker and/or CLC line filter from power strip and 500V MOV
     
    itai shi likes this.
  13. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    (so i still hadnt the time to fix it, hope tonight),
    if the line in the wall is already connected to a CCT Breaker on the other side of the line - in the Electricity Cabin, so my situation is ok ? (is that what you meant?)
    and i dont need also the CLC line filter....?

    currently dont have an RTV like dorke suggests,
    i will only fix the soldering to be as little as they could be.

    thanks again fellows.
     
  14. davenn

    davenn Moderator

    13,381
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    Sep 5, 2009
    note it is only rated at 70W ..... good for charging phones etc .... maybe an electric shaver low power things like that

    keep that in mind if you do get it working
     
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  15. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    it is for Wii (nintendo),
    on the Wii it is labled that its need 52W.
    i guess it a little more than charging phone or any other device....?!
     
    davenn likes this.
  16. davenn

    davenn Moderator

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    Sep 5, 2009
    a little more yes, but within the limits of its capabilities
     
    itai shi likes this.
  17. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    thanks alot dave (-:
     
    davenn likes this.
  18. Sunnysky

    Sunnysky

    465
    115
    Jul 15, 2016
    if it broke once, it can also again. reconsider what I said
     
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  19. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    you mean i should glue it so it would be more stable ?
    i would do that , thanks.
     
  20. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    i hadnt the time to answer and thank,
    its working !!
    great help , thanks !!
    you guys are really awesome !!!
    (-:
     
    (*steve*) likes this.
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