Roman wrote:
>David Duffy wrote:
> >
> > A question for anyone who uses stepper motors. (Roman ?)
> > Is there a good little driver IC for small bipolar steppers that
> > is not too dear & is available in Oz? The L293 looks OK apart
> > from the high quiescent current. I was thinking of using motors
> > stripped from 3.5" floppy drives. Still just mucking about with
> > different motors before I settle on a platform design. The guy
> > who does our metalwork will see some odd drawings come
> > through on his fax in the next week or two!  Everyone needs a
> > fun project every so often to keep them sane. :-)
> > Regards...
>
>Hi David, the Mitsubishi M54646 looks nice, this
>is $14 AU from WES. Drives both phases and only
>needs two dig inputs for full bipolar operation.
>It also has current ref inputs, so with two
>analog pins (PIC pwm?) you can get full
>bipolar microstepping from one 28 DIP chip
>with only 4 PIC pins.
>
>Second choice is Allegro TEA3717, it has 8 step
>math-compensated microstepping built in with 3 bit
>digital input, but you need two chips, one for
>each phase. Can be sourced in Aust for about
>$10 AU each.
>
>Datasheets for both are common if you do net
>search, or contact me off list I can email
>datasheets to you. :o)
>-Roman

Thanks, found the data sheets easily.

>PS. Is this for a little bot?

Yes, but the unipolar steppers are looking much cheaper to drive.
5V steppers would be better as I already have 7.2V 1700mAH nicad.
The 5.25" FDD ones don't run very well from much less than 12V.
I might pull another couple of FDD's apart & see what drivers they use.
Regards...

___________________________________________
David Duffy        Audio Visual Devices P/L
U8, 9-11 Trade St, Cleveland 4163 Australia
Ph: +61 7 38210362   Fax: +61 7 38210281
New Web: www.audiovisualdevices.com.au
New email: avd@audiovisualdevices.com.au
___________________________________________

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