5 pin Transformer connection help

Discussion in 'General Electronics Chat' started by imraneesa, Jun 2, 2015.

  1. imraneesa

    Thread Starter Member

    Dec 18, 2014
    186
    4
    I got this transformer from the circuit used to light the fluorescent tube. the circuit is not good and so i removed the transformer and the 882 transistor which is used to run the transformer. the diagram shows how it was connected. i dont know where to connect the 5th pin. and also dont know what type of transformer is this. somebody please put some light on this. so that i can use this transformer and transistor and light the tube. it was using 6v DC battery. i want to light the tube with two 3.7 lithium ion batteries. please help.
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    2,800
    1,237
    Assistance will require more info. It makes no sense to me that the secondary winding shows a DC resistance of only 4.2 Ohms:confused:

    FYI CCFL transformers typically feature:

    A primary winding: -- DC Res < 1 ohm
    A Feed-back winding: DC Res < 500 milliOhm
    A Secondary winding: DC Res between 200 Ohm and 1K Ohms

    But your your Xfmr has only five leads...:confused:

    Again, info as regards former application and an image of the transformer may help...

    Best regards
    HP
     
  3. imraneesa

    Thread Starter Member

    Dec 18, 2014
    186
    4
    Here is the picture of the transformer. yes the transformer have only 5 pins. and all the pins shows continuity.
     
  4. BR-549

    Well-Known Member

    Sep 22, 2013
    2,004
    394
    4.4 ohms between primary and center tap of secondary? Bad transformer.
     
    Hypatia's Protege likes this.
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,555
    2,375
    If continuity on all pins its an auto transformer.
    Max.
     
  6. imraneesa

    Thread Starter Member

    Dec 18, 2014
    186
    4
    What is auto transformer sir?
     
  7. imraneesa

    Thread Starter Member

    Dec 18, 2014
    186
    4
    how to connect this autotransformer to light up fluorescent tube using one 882 transistor?
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,555
    2,375
    Google Auto transformer, you will get many hits.
    The primary is part of the secondary, no galvanic isolation.
    You would need to know the original configuration.
    Max.
     
    Hypatia's Protege likes this.
  9. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    2,800
    1,237
    In general you would place the load across most of (or the entire) winding -- while applying drive to a small segment thereof--- howbeit I feel those resistance readings are 'goofy' for a transformer applied in a 'florescent inverter'...

    Best regards
    HP
     
    Last edited: Jun 4, 2015
Loading...