I've got one of these cheapo noisy bench power supplies that I use for rough-enough-is-good-enough purposes. A while back the voltage setting was becoming unstable, jumping up and down several volts. I read somewhere that they have dodgy pots. As luck would have it, I had a big bag full of exactly suitable 10K pots that work threw out, so I replaced all four and things were back to normal, or so I thought. I was so pleased with myself... Some time later I found that the adjustment range on the current limit setting is not what it should be. Should go from zero to 5 amps, but it only goes from about 4 to 5 amps.
Now I'm *fairly* sure all four original pots were 10K but maybe they weren't. Does anyone have one of these that they could have a look? Or maybe a schematic. Haven't found a schematic on the interwebz. Seems like the same case is used with any number of different internals.