RE: [CAD_CAM_EDM_DRO] Step & Direction 3 axis board plan

Hi

For small step-direction to stepper controllers, I've had good success with
the UCN5804B chip using the circuit direct from the application notes. It
will handle up to 35 vols at 1.5 amps. Come from a parallel port data pins
to it's inputs, tieing each high to +5v throug a 4.7k resistor, add some
diodes for coil protection and you have a controller. Its not a chopping
drive, but it's quick.

There was a good write up of this chip and the L297/L298 chopping chips in
Circuit Cellar magazine Oct. 1993. Page 26

For the UCN5804B http://www.allegromicro.com/datafile/5804.pdf

Do a search on the chips in question as there are several robotic sits that
have example circuits.

Dennis

> Dear lister!
>
> You guys and ladies (any?) are doing a great job and since on the list I
> have learned a lot from you!
> I am in an early stage of building a tiny milling machine to use it for

fun

> (next to my printer on my desktop ;-). I have found quite some amount of
> freeware and shareware on the web and have found out that there are

several

> approaches to motion control of three stepper motors. I se that the most
> common one is step&direction approach using only two pins to control one
> motor. I would like to build a motion control card like that, but I can

not

> find any plans on the web for it. Any of you listers have them and willing
> to share them with others? I would be immensely happy to se one published.
>
> With best regards, Matjaz

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