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Forum: 80. Computer Hardware & Software Tue 18 September 2007, 11:08
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, I had a closer look at your...

Aubrey,
I had a closer look at your datasheet and I noticed the following. The specifications for switching mode of operation for that opto has TYPICAL turnon time of 3 us and a min turn...
Forum: 80. Computer Hardware & Software Mon 17 September 2007, 13:05
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, At 200 Khz your period is...

Aubrey,
At 200 Khz your period is only 5us. The 250 kHz is only the absolute maximum frequency the isolator will tollerate. With the other specs your setup, rise and fall times I dont...
Forum: 80. Computer Hardware & Software Thu 13 September 2007, 15:17
Replies: 90
Views: 185,052
Posted By domino11
Mike, I think Aubrey summed my thoughts...

Mike,
I think Aubrey summed my thoughts up better than I did. I was referencing the chopper current ramping which will affect the available torque. This is what I think Alen is doing in...
Forum: 80. Computer Hardware & Software Thu 13 September 2007, 15:14
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, Great, like I said before...

Aubrey,
Great, like I said before I am no expert, just trying to help you cover the bases as you round out home plate. :) Some of this stuff is from 15 years ago for me so please...
Forum: 80. Computer Hardware & Software Wed 12 September 2007, 07:23
Replies: 90
Views: 185,052
Posted By domino11
Aubrey / Gerald, Yes I...

Aubrey / Gerald,
Yes I agree that Mach does some speed ramping but that is not what I am referring to. There are still special algoirthms implemented in the driver boards...
Forum: 80. Computer Hardware & Software Tue 11 September 2007, 06:54
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, Check out these links. One...

Aubrey,
Check out these links. One is an app note from the atmel corp which references an article in a trade journal. The second link is the authour of the articles web site with the...
Forum: 80. Computer Hardware & Software Sun 09 September 2007, 13:50
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, Not that I am any...

Aubrey,
Not that I am any expert on stepping algorithms, but I have written some assembly language programs to control some stepper boards for some projects we have done at work in...
Forum: 80. Computer Hardware & Software Thu 06 September 2007, 06:59
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, What about starting with one...

Aubrey,
What about starting with one of the discrete designs that are available and modifying it to meet your parts availability and cost perspective? That way you might at least eliminate...
Forum: 80. Computer Hardware & Software Tue 28 August 2007, 12:12
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, here is a discrete design...

Aubrey,
here is a discrete design from Phils site. Take a look, easy to get parts
Forum: 80. Computer Hardware & Software Tue 28 August 2007, 12:01
Replies: 90
Views: 185,052
Posted By domino11
Gerald, Yeah I figured as much, I...

Gerald,
Yeah I figured as much, I thought the forum corrected for your own time zone. Funny here in Canada everyone calls the morning and afternoon breaks "coffee breaks". Tea doesnt...
Forum: 80. Computer Hardware & Software Tue 28 August 2007, 11:58
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, Some of the better sites for...

Aubrey,
Some of the better sites for electronics components (in the US anyways, Im in Canada and get stuff shipped to me all the time) are

www.digikey.com
www.mouser.com...
Forum: 80. Computer Hardware & Software Tue 28 August 2007, 08:32
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, Here are a few app notes...

Aubrey,
Here are a few app notes from Allegro. Some reference specific brand steppers or specific Allegro chips but they have a lot of info on drivers and steppers and how to interface...
Forum: 80. Computer Hardware & Software Tue 28 August 2007, 07:39
Replies: 90
Views: 185,052
Posted By domino11
Gerald, I just noticed your post...

Gerald,
I just noticed your post 4:17 am? I hope that doesnt take into account the time difference! Or do you stay up that late?
Forum: 80. Computer Hardware & Software Mon 27 August 2007, 07:48
Replies: 90
Views: 185,052
Posted By domino11
Aubrey, I am still wondering why you...

Aubrey,
I am still wondering why you want to DESIGN your own controller. With the multitude of great driver chips available these days, and board layouts and schematics available at ...
Forum: 80. Computer Hardware & Software Fri 24 August 2007, 13:34
Replies: 90
Views: 185,052
Posted By domino11
Aubry, Actually, Im not sure what type...

Aubry,
Actually, Im not sure what type of driver chip Mike was referencing, but I do know that the LMD18245 used in the pic step uses a constant current chopper drive. Essentially they use...
Forum: 80. Computer Hardware & Software Fri 24 August 2007, 11:10
Replies: 90
Views: 185,052
Posted By domino11
Gerald, Yes I understand the...

Gerald,
Yes I understand the differences in peoples abilities/intersts but was just curious as to yours. You seem like a real hands on person and just thought you might have done some...
Forum: 80. Computer Hardware & Software Fri 24 August 2007, 08:45
Replies: 90
Views: 185,052
Posted By domino11
Gerald, Have you ever thought of...

Gerald,
Have you ever thought of building some drivers for your Mechmate? If you were to get a printed circuit boards from pminmo, then assembling them is not all that hard. Could be...
Forum: 80. Computer Hardware & Software Fri 17 August 2007, 12:25
Replies: 90
Views: 185,052
Posted By domino11
Hi For anyone thinking of building their...

Hi
For anyone thinking of building their own drivers and interface boards, I highly suggest looking at www.pminmo.com. He has a variety of proven driver and interface board designs as well as a...
Showing results 1 to 18 of 18

 
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