![]() The spindle draws 0.4 amps DC and the load from the mains supply is 0.75 amps. One across the + and - and one from each lead to the frame of the machine which is also connected to the domestic earth supply. I have 3 x 0.1 MFD ceramic capacitor on the motor terminals. An 80 volt transformer secondary and 2 x 4700 MFD 250v capacitors give 102 volts at the motor, same as max power with the Banggood controller. The variac enables speed control still but as I can't see the spindle being run at anything other than maximum speed this could be replaced with a basic transformer. I began to think the problem is the controller and not the spindle so I now have it running from a variac, bridge rectifier and smoothing capacitor circuit. ![]() The optical isolator I tried just crashed the computer as soon as it was plugged in, maybe I had a faulty one. The power supply uses pulse wave modulation and it is not pure DC at the terminals. I had tried all these and was still getting problems. The suggestions include, use a short screened USB cable, fit capacitors across the motor terminals, use an optical isolator in the USB line,and fit ferrite beads to the leads. If you look around Youtube there are others with the same spindle having similar problems. I have had a few problems with the spindle/controller causing electrical interference and The mulitool you see me using is the one below, cheaper than a Dremel.
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