I recently purchased a Riden RD6006 power supply and attempted to use it in conjunction with my homemade power supply made from a computer PSU. Sparks literally flew when I attempted to connect the grounds of each supply together. I discovered that the voltage difference between the earths was about 66 volts which happens to be the max power supply to the Riden unit. My background is mechanical engineering design with some electronics but not enough to understand this problem.
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