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Thank you all for being active in helping me with my problem.
I checked the soldering joints and there were one shortcut
and one unconnected wire. I fixed them and the board is
working OK. I have...

Hello all!

Does anybody have a setup guide or
user manual for Nikki denso npsa-102MU actus
power? I have Googled my *** off and nothing
is found, except repair services.


With Best...

Thank you pminimo. I'll try another layout.

It should be in full step mode. Pin 19 on l297 is connected to the ground.

Hello again!

I tried both phases separately. First seems to work. The motor buzzes
a bit and takes clear steps. The other however, "tries" to take steps.
The buzzing noise is not present but...

Thank you for your answers. I'll do some wiring
experiments. The Motor connections are OK. I
have a working driver too and it runs the motor.
However, I would like to have my own version
working...

Thank you for your posting! :)

The holding torque indeed disappears. The board is done according
to this note: http://us.st.com/stonline/books/pdf/docs/1734.pdf.

It really seems like the...

Hi All!

This is my first post here, so I'm quite new. I built a bipolar
stepper motor driver according to the schematic which is given
in application note 470 in the web site of st electronics....