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Yes the steppers have their own controllers. I did try a smoothing capacitor on the magnet supply but that made it worse...then I realised later that I had put the power connector and capacitor on top of the arduino so not a good position for cross-talk! thanks for your reply, I had to give up and r...

Hi, thanks for your suggestions, I have followed these, with results as below: I assume from the above comment that power is still connected to the magnet, just not via the relay? A: the magnet is only powered through the relay, 12 V about 0.4 A. Is the 12V supply that powers the magnet also used to...

I have a positioner system with 3 stepper motors controlled by an Arduino Mega, and I just added a relay (Arduino 5V relay module HCARDU0001), to switch on a 12 V DC supply to an electromagnet. This causes a problem with a stepper motor, as soon as I put the power to the relay the stepper motor soun...