# Reduce the output current from a stepper driver

I have to control 2 stepper motors with a single driver (multiplexing one at a time) and both motors are different, one 1.7A and the other 0.4A, if I set the current to 1.7A the 0.4A motor can burn out. Is it possible to put resistors at the output of the driver to reduce the current? How could I calculate it?

edited: the motors are

1.7A=17HS4401S, resistance per phase: 1.5 ohm

0.4A=JK42HS34-0404, resistance per phase: 30 ohm

• The motors may already have different resistances. Add this info to the question.
– user16324
Feb 22, 2021 at 13:39
• I am confused. How can you "set the current to 2A? Feb 22, 2021 at 13:44
• @BrianDrummond edited Feb 22, 2021 at 13:45
• @tlfong01 the driver (a4988, is the most popular) have a potentiometer and you able to set current up to 2A Feb 22, 2021 at 13:46
• I think you're going to have to use two different A4988 modules if you need to have two different motor current limits set. This module has only the onboard potentiometer to set the max current and there is no means provided to set it programmatically or from another input. Feb 22, 2021 at 14:03