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Originally Posted by Butcher
0V and 12V... less likely to nuke your PSU.
Better... adjust the voltage to limit current flow.
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I'll use the 0V and +12V then. Thanks. I do use expendable old AT power supplies for these jobs, but only have four at the moment.
Current flow is usually easy to adjust by the gap between anode and cathode in the electrolyte, which acts like a variable resistor. Or one could add water to further limit current. I agree though a bench power supply would be best.