Transformator question

Discussion in 'Homework Help' started by bennethos, Sep 15, 2009.

  1. bennethos

    Thread Starter New Member

    Sep 15, 2009
    Hi I bought this transfo where the primary winding is 230V .
    This is the 2nd time i'm building a power supply (i'm very new to this)
    I actually need -18v & +18v.

    But I can't manage to figure out how to read/connect the secondary winding part...

    there's 8 pin's coming out of the other side. on the transfo I can read :

    0 <-- 9-11-13-15 10-12-14-16 --> 9V 4.44A

    0 <-- 9-11 10-12-13-15 14-16 -> 18V 2.22A

    ct ct
    18V <-- 9 10-11 12 13 14-15 16-> 18V 1.11A
    | |
    1.11A ---------- ------------------> 1.11A

    It would be very kind of you guys to help me out on how to read this, I'm trying to figure out how it would look like if I would take a saw and go through it :p (I always need to see stuff visually to be able to understand lol).
    I guess there's the metal core with a big primary winding and 9 little windings ?? but how are they interconnected I ask myself ... I guess the above must be very logical for someone who can figure out the part that I can't figure out :p

    thx in advance !
  2. Audioguru


    Dec 20, 2007
    Your transformer should have a datasheet that shows a labelled photo of all its wires.

    You bought a transformer that has too many windings.
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    Put power to the primary and use a meter to find the CT and 18 VAC windings relative to it.