Re: [CAD_CAM_EDM_DRO] Stepper Motor Driver

no, it will not self destruct.
the international rectifier hexfets have a built in
reverse diode that will handle FULL LOAD CURRENT.
they are sweet chips.
However, irfz is NOT the right choice - use IRLZ54.
these are made to run on logic level input.
digikey has them.
if you want a nicer circuit that's about as simple,
grab the pdf from this link.
http://robotstore.com/catalog/display.asp?pid=63
(i do not endorse this company. in fact, before you
buy that kit from em, i'd rather send you boards for
free!)


--- Jon Elson <elson@...> wrote:

> Blue wrote:
>
> >Hi,
> >
> >I thinking of buying this kit in the link below.
> Could one of you
> >electronics people look at the link and tell me if
> I need resistors in
> >series with the motor connections and if so where
> and what sizes and
> >wattage.
> >
>
>http://www.electronic-kits-and-projects.com/kit-files/3000/3179.pdf
> >
> >
> This drive will operate the resistance-limited
> motors found in floppy
> drives,
> etc. It is of no use on any motor above size 17, as
> it will self
> destruct due
> to the motor's inductance, which they made no
> provisions to handle. You
> will also have to supply very large (100 Watt+)
> resistors to limit motor
> current. The performance of this driver will be
> abominable at any speed
> above zero. You will be lucky to get it up to 60
> RPM before the motors
> stall.
>
> Jon
>
>
>
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