Turns out Radio Shack has 12-volt LED's with integral resistors, so problem should be solved.
Not having dealt with LED's very often, I am wondering - will they burn out if you try to run current through them backwards? Or will they just not light up? I know my MK2B heated bed has a place where 2 LED's can be soldered, and from what I understand that is so that it doesn't matter what polarity you have the bed hooked up, one LED will always be lit.
Not having dealt with LED's very often, I am wondering - will they burn out if you try to run current through them backwards? Or will they just not light up? I know my MK2B heated bed has a place where 2 LED's can be soldered, and from what I understand that is so that it doesn't matter what polarity you have the bed hooked up, one LED will always be lit.