It is important to find out what your transformer will do.
You could connect the SG6841 and see what happens.
OR
You could connect a signal generator to the primary and look at the secondaries and see what the turn ratio is and the phase.
If we knew that, then we could look at the many combinations available. (Windings can add.)
There are different ways of using diodes. Using a center tapped winding you could get +5V, +5&-5V, +10V, +10v&+5, -5v, -10v, -10&-5. With a little thing I could make other voltages.