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bipolar stepper motor

l298 used for bipolar stepper control


For the project I'm working on I have designed a motor control board based on the l298 and an Attiny2313, which can be controlled using i2c.

It works pretty good but I'm having a strange issue running a 12 volts stepper: 

When I'm making one single step at a time the torque of the motor is very low no matter  how long I keep the coils energized. If I do multiple steps the torque is as it should be for this motor.