External Power Supply


I am trying to solve this problem:


Basically what I would like to know is how to hook up an external power supply that supports stepper motors with 5-12 or 12 V.

Thanks. :)

Maybe you just need to add several mosfet to drive it–it’s much cheeper,and you need to solder the circuit , or use L298N motor driver --It can find in many opensource factory.such as seeedstudino,elecrow,dfrobot and so on.