Hello, I need a 300V DC power supply with a limited current of 0.5mA (or 500 micro ampere) for specific electrolysis work that requires high voltage and low current. I found sophisticated electrophoresis PSUs which are sold for thousands of euros. But since I need both limited current and voltage, I wonder if I can find a workaround. I am pretty much ignorant in electrics but I am trying to understand, because the other solution is off-budget for me. For example, I could find interesting power solutions here https://www.xppower.com/Portals/0/pdfs/SF_Q_Series.pdf As you can see some models are delivering the much wanted micro amperes. But how could I limit the voltage and current at the desired rate ? As you see I am pretty much stucked at this point. Is it hopeless and should I apply to get a loan ? Your comments are welcome !