Re: [CAD_CAM_EDM_DRO] Stepper Motor Driver

yah...the guy has the clever idea that it's the way to
finance his business by not paying suppliers til he
sells the stock he bought. And dragging it out as long
as possible even after.
5 of those kits, including the stepper controllers
were mine. once he was able to bankrupt me (that part
of my business, at least) he offered me a dime on the
dollar.
i finally got 1000$ each for the 'rights', but that
sure was the end of dealing with him.
quite apart from the fact that charging 40$ for
something i sold at 12 is offensive to me.

--- Blue <jo001k1132@...> wrote:

> 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
>
>
>
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