>I don't have a -48VDC power supply to test it with, but as far as I know +48VDC has the same effect. Grab the same leads of +48VDC, but switch your hands, lef

>I don't have a -48VDC power supply to test it with, but as far as I know +48VDC has the same effect. Grab the same leads of +48VDC, but switch your hands, left lead to your right hand, right lead to your left hand. You will get -48VDC.