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Mix anti-phase - load on amps

Discussion in 'Electronic Design' started by Martin Kane, Jun 7, 2011.

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  1. Martin Kane

    Martin Kane Guest

    Quick question please.

    If I have two audio signals from two amps, one swinging entirely above
    DC and the other entirely below what happens if the active sides are
    mixed without any earth connection? Both signals are identical and
    with the same DC offset, but 180 degress out of phase.

    I am assuming the net voltage will be zero, but how does this affect
    the load seen by the amp?

    Martin Kane
     
  2. Martin Brown

    Martin Brown Guest

    You appear to be describing a bridged pair of amplifiers. Such a
    configuration can be used to deliver larger voltages across the
    terminals of a higher resistance load up to the rating of the amp.

    http://en.wikipedia.org/wiki/Bridged_and_paralleled_amplifiers

    Isn't great but it has diagrams that might help you phrase your question
    more clearly.
    If you connect them together without a load resistance the power output
    stages of each unit will attempt to destroy the other until at least one
    of them is successful or the fuse blows. Possibly both.

    Regards,
    Martin Brown
     
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