Re: [CAD_CAM_EDM_DRO] Stepper Motor Driver

Hi,

Nice to know, Isure won't deal with someone who doesn't play the game
fairly.

Regards,

Terry

| 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