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  1. #20
    The first link, M542 drivers, is ideal. Not sure if it's the cheapest - just look for 3 drivers with 542 in the part number and a suitable breakout board and you'll be fine.

    The second link is pretty poor as the driver only goes up to 30V and the motor torque (and therefore feedrate) is proportional to the applied voltage. Plus you'd be running very close to the maximum current for those drivers.

    Again if you can check the rectified voltage from the transformer with a multimeter and it's less than 50V, but significantly less then you can keep it as long as it can deliver enough power. Could you measure the diameter and height of the transformer so we can estimate the output current?

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