Quote:
Originally Posted by Matt Syson  I think what Tim was getting at is that the transformer ensures the output is balanced. Without it if you had only unbalanced sources, while the output is strictly 'balanced' there would be no great contribution from the 'opposite' phase being thus the same as an unbalanced output.
It would still of course 'contribute' to hum and interference cancellation which would be lost if the transformer were omitted and it is fed into an unbalanced stage. |
It doesn't matter if there's any signal on the cold output or not. It's still a balanced output, with or without the transformer. Balanced interfacing has nothing to do with signal symmetry. It only requires impedance symmetry.
In fact, this circuit will still be balanced without the transformer OR the op amps.