Friday 29 August 2014

When driving stepper motors do i need to worry about back EMF?



When i've driven coils in the past(such as mechanical relays) i've had to put a diode to protect it against back EMF once turned off. Do i need to do that when driving stepper motors with a ULN2803a?



Answer



Diodes are advisable.


If you had bothered to read the data sheet you would have seen that the chip includes clamp diodes!


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