Noisy pot issues?
I've been experimenting with a variable output power supply. It takes 18V @ 2amps in from a wall adapter. It uses the LM2596 simple switcher as a regulator. My circuit is more or less the same as the test circuit from the datasheet (image attached). The only thing I've changed is that R1 is a 5k trimpot and R2 is a 50k 10-turn pot. The trimpot is so I can dial in the proper value for R1 and the other pot is to vary the output voltage.
It works more or less as it should. The one issue I'm having is I think due to the inherent "noisiness" of potentiometers. When I turn the knob (sometimes it seems when I just touch it), the output voltage will "spike" up. It eventually falls back down to where it should be and stays steady, but it seems to spike everytime I adjust it.
Does this indicate a bad pot? Or is there some additional filtering circuitry I can put to avoid these spikes or ripples? Would another L-C filter help?
Thanks in advance,