Dual Opamp Buffered Power Supply

There will be instances where the currents
from each supply will be unequal. Where this is the case, the resistor
divider is not sufficient, and the +ve and -ve voltages will be unequal.
By using a cheap opamp (such as a uA741), a DC imbalance between
supplies of up to about 15mA will not cause a problem. However, we can
do better with a dual opamp (which will cost the same or less anyway),
and increase the capability for up to about 30mA of difference between
the two supplies.

Source: http://sound.westhost.com/project43.htm

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