I have a variable power supply that puts out 19.5VDC when the potentiometer is one way and about 27.3VDC turned the other way. I need a power supply that is 14.4-14.6VDC. Can I simply change the potentiometer on the variable power supply to a different value potentiometer so that I can get 14.4VDC? Or is there more to it than just that? The power supply label says it's 27A in case that's relevant.