Open Source Boards Available, Stepper Drivers and Break Out Boards

[pminmo]

tach,
After working on it for awhile I'm pretty sure I'm down to 9 jumpers and the two grounds isolated back to the connector. (one exception the probe led, didn't see the point for it) See if this is more inline with your thinking. I did order some of the FETS you recommended from mouser. Virtually the same price as the 44Z's, will give then a shot.

Phil

[pminmo]

And lastly,
I added a latch for estop on a simple BOB compatable with the single axis drivers. Eagle files, looking for input.

Phil

[tachus42]

Phil I'm usually abit paranoid about keeping the bypass caps close (electrically) to the devices they are bypassing and keeping the area of the loop enclosed by copper from supply pin to cap to supply pin as small as possible so i think its best to keep the 3 extra supply jumpers. Other than that the layout looks good.
The STP30NE06 has a threshold of about 2 volts - it's designed to be driven by logic chips, there are others like it of course that was just the one the local electronics store stocks.

Attached is the "chopper converter" one is needed for each axis. Q4 and Q5 form a discreet schmit trigger. As I said earlier i haven't built it it but i have simulated it with spice.

[slp_prlzys]

hi guys,

I tried the 5V side of the PSU, but
it seems not enough I could stop the
motors with my 2 fingers, so
I got me some resistors, 'couldn't find
the exact value and got me a bunch of
10Ω 10W on surplus, initially I wanted to
use the 10Ω as is, but steppercalc™ says
it would only give out .88A, I set them up
in parallel now I got 4.8Ω which gives out
1.41A, I thinks it should be ok. I got the 2 motors
running and the resistors does get real hot,
the psu fan that I use as load on AT psu helps
a bit to cool the resistors, tho it turns slower than
it should be.
With the 12V supply on the motors I could still
stop it with my fingers but I do have to try real hard,
I was hoping that the motors are better than that.

btw, guys if you ever finalize your new design,
I would like to get my hand on that too, I kinda like
the idea of not having those large resistors.

thanks for the help.

[GaryM]

Hey guys,

I am like just getting into electronic's, so I am really dumb when it comes to components. Would it be possible to maybe post the part numbers that you would actually look for, say from Digi-Key? I started to ordering some things from Digi-Key and I think I actually got some of it correct. But man I got this one component, it was like supper small. Oh it looked like an IC, but was it small. So if you could please help a dumby I would be greatful.

Gary

[pminmo]

Gary,
Which board?

Phil

[GaryM]

Hi pminmo,

I have been looking at your recent board the OSuni-3(317).brd. Really appreciate any help!

Gary

[pminmo]

Slp, the resistors will get hot no doubt about it. Sounds like your making good progress


Phil

[pminmo]

tach,
I haven't done anything that discrete for MANY years! Scratched my head for awhile, but think I've got a high level understanding. I can't see a reason it wouldn't work.

On your 3 axis boards, 3 questions:
1. Did you mean for the current limiting resistors for the LED's to be 1K?
2. Hmm, the IRLZ44 has a 1 to 2 v gate threshold, maybe we had a typo somewhere in the translation, the schematic I had IRFZ44 which is 2 to 4, thats what we've been missing?

3. What about putting a 120K resistor from VDD to the base of the logic probe for a bit of glow in an open state?

If you concur with any of the above, how about updating your eagle files and reporting them. I'll incorporate into a parts list and document.

You might double check the parts listed at the bottom of my webpage as a second set of eyes.

Thanks,
Phil

[pminmo]

Gary, at the bottom of the page:
http://webpages.charter.net/pminmo/cncelectronics.htm
I didn't do a 100% check on cap sizes, but think there ok.

Phil

[arcclaro]

Í saw this project at least a year ago, but now that i have some interest i ask if someone with some experience could look at this and give an opinion about it...

it's a controller for a foam cutter designed in a spannish forum...

5 Amp at 50 Volt max seems very good, right?


http://www.cenece.com/ceneceC4.htm

[pminmo]

I don't read spanish, but looking at the board layout, it uses 4 18F84 PIC controllers and IRF540's to drive the motors. Very clean layout, current limit resistors not much space. Needs external 5vdc, besides motor power. You would have to be able to program the PIC's. Two relays on board, driven by a 7438N in conjuntion with a 555 timer. Very comparable to the 3 axis board tach has done in terms of drive. Other than that, I'm not much help. Sorry

Phil