Hello, I am trying to design a foundation for an audio preamp that is powered by a single 9V battery. I am successful so far except the single power supply part. I am using the voltage divider scheme to get a +4.5V and a -4.5V reference voltages. With no load the supply voltages are close to even but when I add a load of say 1K the voltage shifts at the supply pins. The plus increases and the neg sides decreases. Do this mean the positive side is pulling more current and therefore dropping more voltage? The set up is 1mV AC input to non-inverting side with negative feedback for A = 100.