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Earth from AC xfmr sec

Discussion in 'Electronic Design' started by Robert Steinmetz, Oct 24, 2006.

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  1. Please excuse me if this is too basic. I have a step-up transformer
    driven by an audio AC signal. I need to earth reference the output or
    secondary winding so current only moves one way in the load.

    Is this a simple as earthing one side of the output? IOW one side of
    the load being driven by the secondary would see a parallel connection
    to earth.

    Thank you for any advice.

    Robert S.
     
  2. Tom Bruhns

    Tom Bruhns Guest

    Yes, just ground one side of the secondary. In truth, current will be
    in both directions in pretty much any useful audio load, though,
    because it IS an AC signal that comes through the transformer. By
    definition, AC is bidirectional. Beware that if the load is also
    connected to earth/ground, it's possible to come up with a "ground
    loop" that puts signals you might not want into the load. That
    shouldn't be a problem if the load circuit (transformer secondary,
    wires to the load, and the load) has only one connection to
    ground/earth.

    Cheers,
    Tom
     
  3. Eeyore

    Eeyore Guest

    You have a DC transformer ???? !!!!

    Audio is AC. It moves both ways.

    What's your real problem ?

    Graham
     
  4. Eeyore

    Eeyore Guest

    What do you mean by 'one side oth load' ?

    The transormer itself has no earth. That's one of the reasons for them.
    The output is 'floating' i.e. not referenced to any potential until you
    make any such connection ( usually simply by connecting to the load ).

    Graham
     
  5. This question is nonsensical.
     
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