October 28, 2011
about 3 days ago
My advice for those having problems with overheating and slow speeds is to make sure your using a good clean power supply , like one from an old PC , there usually around 18v / 3a , plenty for running NEMA 17 motors .
Also make sure your power lines are at least a 22g or 20g , anything smaller will defiantly cause the chip to really heat up , why ??? I don’t know , I just know if I use smaller lines and dirty power these chips heat up to the point you cant touch them .
Iv been using 2 of these with 2 NEMA 17 2a steppers for a telescope for a few years now , I run them at 1.3/1.4 amps each . Iv run these for 5 to 6 hrs straight with a clock drive on and when Im done for the night the chips are Luke warm at best .
As far as I’m concerned these chips are fantastic and Brian Schmalz was very helpful when I needed help/advice .
about 3 years ago
“ edit ” Ooops , I posted the same site as RobertC did . didn’t see the link there at first .
Good site by the way .
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