I am working on a device that needs a balanced audio line driver that can convert an unbalanced signal to balanced and drive a balanced cable run between devices. I am looking at schematics using devices like the THAT1646 and also op-amp circuits that can do this, but the all seem to run off a bipolar supply (+/-15V, +/-12V, +/-9V, +/-5V, etc), whereas my device needs to run off a single ended supply (+9V only).
Does anyone have a circuit they can share to do this on a single ended supply?
Update: Would prefer to avoid using audio transformers. Looking for an IC or op-amp based solution.
Update: Looking for output to be hot, cold, ground (3 wire). This is meant for balanced xlr audio connections.