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Mix anti-phase - load on amps

M

Martin Kane

Jan 1, 1970
0
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
 
M

Martin Brown

Jan 1, 1970
0
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.

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

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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