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Originally Posted by Kobuchi
No good reason. It works with just -5VDC on the copper, or +5VDC on the waste metal (steel or stainless), or +12VDC on the waste...
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Easier to use 0V and 12V I'd have thought, and less likely to nuke your PSU. Better would be to use a bench power supply so you can adjust the voltage to limit current flow.