carlgrace
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A *discrete* op amp? Really?
I don't think you're going to find much to help you there. Generally discrete designs have a big enough power supply that they can do fine single ended, especially audio frequency circuits.
If it must be differential, an easy way is to make a pseudo-differential amplifier using two op-amps, one inverting and one non-inverting. There is a phase difference associated with this, of course, but if you design fast circuits it shouldn't be a problem at audio frequencies.
This is an old technique, and predates fully-differential op amps (this was done in the late 70s for example). A good reference for this is Gregorian and Temes "Analog MOS Integrated Circuits for Signal-Processing". This is a great book to read in general.
Good luck!
Carl
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