74HC595 run a bipolar stepper?

Archiver

Hi All,

Sorry for the second OT post, but I was wondering if anyone had ever tried
running a small bipolar stepper like the ones found in floppy drives from a
74HC595.

Thanks!

Jonathan

www.madlabs.info

Archiver

At 07:45 AM 3/6/04 -0800, Jonathan Peakall wrote:
>Hi All,
>
>Sorry for the second OT post, but I was wondering if anyone had ever tried
>running a small bipolar stepper like the ones found in floppy drives from a
>74HC595.
>
>Thanks!
>
>Jonathan
>
>www.madlabs.info

Jonathan -

I've never seen that done, not to say that it can't be done. Here is an L293
used as a stepper driver, with a tutorial along with it:
http://www.phanderson.com/stamp/tutorial_3.html

Thanks to Prof. Peter Anderson.

Bruce Bates

Archiver

--- In basicstamps@yahoogroups.com, "Jonathan Peakall"
<jpeakall@p...> wrote:
> Hi All,
>
> Sorry for the second OT post, but I was wondering if anyone had
ever tried
> running a small bipolar stepper like the ones found in floppy
drives from a
> 74HC595.
>
> Thanks!
>
> Jonathan
>
> www.madlabs.info


Check the data sheet for the chip.

Check the coil resistance and your voltage.

Here is a link to floppy drive steppers
http://www.doc.ic.ac.uk/~ih/doc/stepper/

The chip and stepper need to be matched so that the current can be
supplied.

I would considder using a ULN2803 between the 595 and the motor. The
03 has internal diodes. And since you will not beusing all channels
at once, you will never exceed the package rating by pushing any
channel to the max.

Dave

Archiver

Bruce,

Thanks for the link, looks good. Thanks to P. Anderson too!

Jonathan

www.madlabs.info

>
> I've never seen that done, not to say that it can't be done. Here is an
L293
> used as a stepper driver, with a tutorial along with it:
> http://www.phanderson.com/stamp/tutorial_3.html
>
> Thanks to Prof. Peter Anderson.
>
> Bruce Bates
>