Ok, I need jus a simple power supply that can output about 24 volts for both + and - volts. I can get the positive easily but im getting confused on the negative. I can use a LM317 regulator for the postive output but what can i use for a negative output? Also, does the negative voltage regulator need to have a negative voltage input? If yes, then how can i get the rectifier to output only the negative part of the sine wave of the AC signal? Is it jus flipping the bridge outputs? I'm jus confused on the whole negative side.