My teacher gave the task to solder a circuit to supply and connect my Arduino uno, to a 12 V,2A and ~5nm holding torque, stepper motor.
Im a bit puzzled. How can i connect my arduino to this. I looked for switched power supplys, consisting of mainly diodes and capacitors to make smooth voltage and a transistor (who is supposed to get the arduino pwn?) to control the transformator.
As far as I can see the author of that "playwithmyled" link says that his system is not much good.
And an L293 can only provide 1 amp per channel. And it can't limit current if you want to use a high voltage to make the stepper turn faster.
The L293 and L298 are designed for driving DC motors. They can be made to drive stepper motors but it is so much easier to use a proper stepper driver.