Hi,
I have a somewhat similar question. I bought a _very_ cheap 3digit power supply. Seems the kind that does not have a transformer inside. Simply it was the only one available right away. Anyway - I making 0.5lts with a 0.5ml sodium carbonate solution (1 molar) and 8mg karo. Use a 1oz silver nugget 80% dipped in the water, 0ppm tested water. Brand new multimeter set to 200m Amp range. My cathode is simply a copper wire - read somewhere here the thinner the better. So here is the debacle - I can't get the amperage above 1mA... The PSU reads 0.05ish Amps and voltage is at 30V, multimeter reads 01.4 on the 200m range. The anode cathode are placed just around a cm apart. more wire increased the amp a bit. The water turns gold in manner of minutes while I'm fidgeting with the PSU trying to set it up, there's even visible mist seen emanating from the silver, it turns black in no time.
What am I doing wrong? I have a feeling my multimeter might not be properly connected. At the moment PSU+ connected to fused 500mA + on meter. COM connected to PSU + at the copper wire that holds the suspended silver nugget.
Any help greatly appreciated
P.S. I have what seems to be a proper power supply on the way, KORAD. But would really love any feedback. Thanks.