When i am driving only one at a time, everything is ok, but when i am driving two motors (one with 1.7A and one with 0.6A), there is some additional noise beside the normal humming noise, like some kind of “sssss” and variations of it. it also happens when the motors are stalled. when i disconnect one, the noise suddenly stops. i think there must be some interferences or electrical noise somewhere. i found out, that it sometimes stops, e.g. when the motors are in holding position and a pull the decay-mode pin of the ic to ground. but that doesn’t work every time. maybe it depends on the position of the motor.
can you give me some hints how to minimize such kind of noise? maybe some additional capacitors somewhere?
Can you tell me more about your setup? What are you using to send step commands? How you are supplying power? Can you take a video (with audio) so we can hear the noise? You might try adjusting the current limit on your drivers, or raising the supply voltage to see if it changes anything.
Can you tell me more about your setup? What are you using to send step commands? How you are supplying power? Can you take a video (with audio) so we can hear the noise? You might try adjusting the current limit on your drivers, or raising the supply voltage to see if it changes anything.
I do not think the noise is caused by a supply like that, but you might try others to see if the noise differs. Have you tried lowering the current limit or raising the supply voltage like I mentioned earlier?