Re: [CAD_CAM_EDM_DRO] Stepper Motor Driver

Hi,

I thank you for the offer but I'm sure I can build it with strip-board. I
take it this company has upset you?

Regards,

Terry


| 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