View Full Version : problem with stepper drivers uln2803!!

12-09-2008, 10:35 AM
hi guys!!

i m using two stepper motors for my micromouse..
so in order to control them and drive them i m using uln2803..


so as shown in the diagram will i have to use two stepper drivers??
can i drive both my steppers using 1 uln2803??

what is the difference between two diags??
what is the significance of four zeners in first n only 1zener in the 2nd??
which circuit is appropriate to use??

my stepper specification is 500mA,6-12V..

and how to select the zener diode for the circuit??
i mean what should be the appropriate value of zener diodes to be used for my motor specification??

plz help..

12-09-2008, 03:27 PM
First of all.. Not able to see the circuit Diagram...

You dont have to use zener diodes at all? Its Not nessary...

12-09-2008, 04:18 PM
Hope this should give a Idea....


12-10-2008, 04:43 AM
hello friend,
you go through the data sheet of ULN2803. it doesn't need any zener diode as i have used this IC for unipolar stepper driving.only thing is here to use the proper sequence of driving.

12-11-2008, 08:59 PM
dont have to use zener diodes at all? Its Not nessary...
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12-12-2008, 07:15 AM
hey guys thanks a lot..

yup i realised that zeners are not necessary!!

thanks a lot u all!!