The first thing is to establish how much surface area you want to plate at a time (how large is your largest part). This will determine the current that the power supply will need to be capable of. Flash copper requires 9 Amps per square foot of surface area. You could also state this as 62.5 mA per square inch of surface area.
As an example:
Say that the largest piece you intend to plate is less than 48 square inches. This requires 3 Amps (144 / 48 = 3) The voltage required for electroplating is low, never over 6 Volts. In the case of copper I doubt if its over 2 volts.
So, how large is your work?
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