[Hawkeye]

I've scrounged around on the internet for a few hours and decided to ask you guys.
Where can I get a decent priced 3 or 4 phase uni-polar driver board at. I don't care if I have to put it together or if I could just find a decent set of schematics and start from there.

Thanks,
George

[Hawkeye]

Anybody???

[pminmo]

Where in Indiana? What kind of stepper are you looking for a circuit for?

[Hawkeye]

I'm in Indianapolis.
I am looking for a 3 or 4 axis unipolar driver board that won't cost me an arm and a leg. If I could find a good schematic for one I would build it myself.

Thanks For Looking,
George

[balsaman]

www.crankorgan.com

He sells a bare board for a unipolar driver...4 axis.

Eric

[pminmo]

Here is a schematic for a single axis, duplicate 3 or 4 times for your number of channels. The ballast resistor size depends on your motor and power supply.

[pminmo]

Looks like it didn't handle the pdf file I attached, here is a png.

[pminmo]

Ok, png didn't work. hmm... sugestions?

[balsaman]

rename it to a txt extension. Users will have to download it and change the extention back to pdf. Or, just link to the file.

Eric

[ger21]

Change .png to .jpg

Gerry

[pminmo]

http://webpages.charter.net/pminmo/5804schematic.pdf

Everything else hasn't worked. Heres a link to the pdf file of my circuit.

[xairflyer]

Some circuits here

http://www.discovercircuits.com/M/motor-cont.htm

[xairflyer]

found another one that looks like it could be used

http://www.geocities.com/fneagu/cnc_...ic_driver1.htm

[pminmo]

Here is the component side picture of a single sided pcb I made for the pdf schematic.

http://webpages.charter.net/pminmo/5804channel.jpg

[Hawkeye]

pminmo,
Nice looking board. Do you have any other documentation for it?
I noticed you have a seriel hook-up for it, do you have any guide lines for useing a parrallel cable. What are the voltage ratings for the Capacitors/wattage for resisters, and what are the values of R4 & R5?

Thanks,
George

BTW, thanks for all of your responces.

[pminmo]

The db9 (serial connector) is the connector I used for the cable assembly to the stepper. It's not a serial interface. Basically the board requires the stepper power. If you just want to play with a stepper, put a gnd on the enable input line (jumper to the gnd pin) , pulse the step pin between 5 v and gnd to make a step, gnd or 5 v to the direction line. R4 and R5 are the same value, that value is calulated by taking the power supply voltage - 1v - stepper motor voltage rating that give you the voltage dropped across the resistor (Vr). For the resistance value divide that result (Vr) by the current rating of the stepper motor and you have the resistor value. For example if it was a 12vdc power supply and a 7.6v stepper motor 12-1-7.6 = 3.4 vdc If the stepper rated current is .75 A then 3.4 devided by .75 = 4.5 ohms the wattage of the resistor woult be Vr times the current or 2.55 watts. c6 and c2 need to have a working voltage higher than the power supply voltage, the other caps 8vdc and above. The other resistors .1watt. At this point no other documentation. I've got a single sided pc layout I may put on the net in the future. Other pressing issues have a higher priority.

Phil