I am using a 9V battery to power 6 LM324s (Quad Op-Amps), which requires a ground connection, not a -VCC. When I tested the circuit using an electronics kit to provide the voltage, it works fine, but when I replace the electronics kit voltage with the positive and negative leads of a 9V battery, the grounding is somehow not correct. It seems as if the 9V battery is sending a negative voltage from its ground lead. I have it connected with all the grounds meeting at one strip on a breadboard. Is there some kind of component I can purchase to act as the ground? Or is there some kind of suggestion on how to remedy the problem? Can anyone help me? Thanks!