The 7V input is just to drive the logic, a 7V 1A supply should be enough to drive the logic on all the boards. This voltage is fed into a linear regulator on each of the boards, so anything from 7 to about 13 volts should be fine.
Be careful about the motors that you choose. The drivers are really rated at 1.5A with 2.5A being surge current. I have these boards and fried a couple of them before I put power resistor in line with the steppers to make sure the current stayed below the 1.5A range. (I am currently only using the stepper portion of the drivers, not the chopper portion.)
HTH |