[boy80]

Hi to all, I'm new in the forum, so thanks in advance for the help.
I recovered from an old printer a bipolar stepper motor, I think that volt necessary is 24V and from section of the cables I think 250mA.. So I'd like to drive with L298 and L297.. I built this circuit and I've connected to 5V and 12V, can I do this? Or I need 24V for the motor? Whitout the stepper, on phases I see 0V 12V 0V 12V, right! in the start condition.. But if I connect the stepper, it begins to buzz, and on phases I see 6V 6V 6V 6V.. Why?

[Toinvd]

Hi, can you give the diagram which you used, and how you input the controls ( frequentie )
This looks like you hit a current limmit. can you check the current from the 12V supply.
These motors should at least run on the 12V, but don''t be misleaded by the cables, have a look if you can find any product number on the motor, and lat me know.
Rgds, Toin.

[boy80]

Thanks Toinvd, I've solved! 6V are normal in stepper when the start condition is 0101 with 12V supply of stepper.. the problem was ground connection between boards (driver L297+L298 and PIC32 starter kit) and clock speed to high.. thanks to all.
If someone need info about my tests, the stepper PN is: KH42JM2R014B by JAPAN SERVO CO.