Thanks to those who have responded so far. I am not sure which part of my question is unclear. But I will try again.
I have a function generator outputting a 10Hz sinewave at 200ma. (It can adjust up to 1Vpp if required.) From this, I need to produce two identical signals of greater magnitude. One is to swing between +18V and +9V. IOW the +9V is the virtual ground. The second is to swing between -9V and -18V. The latter is virtual ground.
The unconventional part, which may be causing confusion, is that there is no common ground or voltage reference between the two output signals, and neither ever crosses zero. This is what I referred to, perhaps incorrectly, as "isolation". Current required from each at output is about 50ma.
Rather than use specialized parts, I am thinking one possible way this can be done is with three 9V batteries and tow fairly standard op amps. However, I am looking for details on any design that would fulfill the above criteria.
I don't know how to be anymore explicit, but would be happy provide further information so long as I know exactly what is needed.