I'm making a circuit around the stepper motor controller L297 on a breadboard, and I've got it working so far. I haven't connected it to the H-bridge and so obviously not to the motor either. But I'm checking the logic levels using 4 LEDs connected to the outputs and they corrospond with the L297's data-sheet. Here's the really quirky bit, I'm running the circuit using a 9V battery wired to a 5V Regulato which feeds the L297. This circuit is only working off this particular battery. I've got another, fresh, battery that does nothing. The IC remains in its initial stage and no matter how many pulses are applied, refuses to change its state. I've also wired a cheap wall-wart and I get the same problem. I've just spent hours and hours on this thing and I'm pretty frustrated because it just doesn't make any sense. I know its impossible for anyone here to analyze the circuit, but any tips/advice on how to solve the power problem would be MUCH appreciated!