Stepper Motor Driver v3.0
Description
1. For the endstop connectors, we've switched to a smaller footprint 4-pin Molex connector typically used as the audio connector on CDROMs. This brings a few nice features: smaller connector footprint (both connector and cable), cheaper connector cables (by a whole $0.15!) and much less confusing to newbies who may confuse the stepper driver with an ethernet card.
2. We've switched back to the A3977 chip which was originally discarded as too hard to solder (before we knew of solder paste, sadly) This chip is awesome! It offers from full to 1/8 step functionality, 2.5A per phase, and no heatsinking required. Its pretty awesome.
Thats about it. Same footprint as the SMD v2.3, with the same NEMA23 bolt spacings for those crazy enough to bolt it to a motor directly, heh. I'm pretty excited about this board. Early tests have shown it to be much quieter than the v2.3 driver. Yay!
Instructions
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Where can I find the missing files "tools.inc" and "user.inc" for "stepper-motor-driver.pov"? *DONT_KNOW*
hey
i made dis pcb it works fine with a small motor but if jou try to power a bigger motor at 1,5 A or more the chip shut down, the problem has a easy fix add a 47uF elco between Vbb and ground pin 25 and 24.
i will make a new pcb
with a gound plane and thik lines
sorry form my englise
It looks like the A3977 is hard to come by. They recommend you use this one instead.
http://www.allegromicro.com/en...
Just make sure the pintout / footprint looks the same.
Thx for uploading!
Just etched
&
amp;
&
amp;soldered :) Made without solderpaste!
How can I check, if it's working without a mainboard?
Zach,
Here is some pics of laser etching the board. I have not done the 2nd side but just an update. Also, I added vector cut outs to it so a laser cutter can cut holes after the boards copper has been removed. Our Contraptor.org cnc stuff is really suffering from too much vibration so we are hoping
that the ability to microstep will solve some of this.
Some more pics here: http://www.flickr.com/photos/3...
Riley
Zack,
I am no Eagle expert but this is double sided right? (Since layer names were Top and Bottom )
Ril3y
License
More from MakerBot
Could you use the A3977SEDTR-T instead of the A3977SED-T? It seems the same the only difference I noticed is the "TR" and the "(VA)" after the companies name.