PWM to limit current to bipolar stepper

[PeterH]

When you say "simple fixed PWM modulation", does that mean a micro second delay?

Actually, I was thinking more along the lines of using analogWrite to pwm the enable line for your h-bridge.

[ifugaopapercraft]

Would http://www.pololu.com/catalog/product/2133 resolve the problem? Not much hair left to pull after two months of battling the power dilemma!