here is the schematic of 4 ampere stepper motor driver it comes with pwm chopping by which we can control the current flowing. The ic’s i have used for this are below listed L297(stepper translator) L6203(5 A max) 7805(5 volt linear regulator) 40106(inverting Schmitt trigger) mct2e or 4n33 opto coupler (for isolating pulse and direction) [...]