I bought this adjustable power supply kit and successfully assembled it. I wanted to upgrade the potentiometers to 10 turns so I could have fine control over the current and voltage limits set. Both potentiometers are 10K ohm and I have tested both to make sure they were in that range. For some reason, the output of the board drops somewhere like -0.5V when I try to use the upgraded potentiometers but works fine with the originals. What is causing this?
I'll make a WAG on this- the wiper is typically the rear terminal in 10-turn helical pots (vs the middle terminal on single-turn pots), so if you wired the middle terminal to where the wiper should go it wouldn't work well.
Note that Bourns numbers the terminals 2-1-3 from the back (see the drawing).