input & ouput of transformer

Discussion in 'General Electronics Chat' started by aamirali, Oct 17, 2012.

  1. aamirali

    Thread Starter Member

    Feb 2, 2012
    415
    1
    Is there 180 degree phase diff b/w input & output of transformer
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,429
    3,360
    No. Just reverse the leads of one of the windings.
     
  3. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    Depends on how you hook it up.
     
  4. JMac3108

    Active Member

    Aug 16, 2010
    349
    66
  5. bladerunner

    Member

    Apr 15, 2012
    83
    4
    not all transformers have a dot or any notation. The ones I get have two black wires (primary). These have specific connectors.

    One Red, One black (secondary) and one bare (electro-shield).

    There is no notation on the transformer, not dot, only a re-order number and date of manufacture.

    What do you do then?

    I can see that the two black are the first to be wound around the iron core. The black and red come from a larger winding (further away from the core) telling me it is a step-up trans.
     
    PackratKing likes this.
  6. JMac3108

    Active Member

    Aug 16, 2010
    349
    66
    I meant dot notation on the schematic. If you have a part in hand and don't know the polarity, you need to test it with a signal generator and oscilloscope.
     
  7. crutschow

    Expert

    Mar 14, 2008
    12,993
    3,227
    Mains power transformers generally don't have phase notation on the input because it typically does not matter what the output phase is compared to the input.

    If it's important, then you have to measure it as JMac noted.
     
Loading...