Hey guys. I'm back with another project that needs a (possibly) weird PSU. Dual voltages again (maybe) but not the same ones as before (+/-15 and +48vdc if you remember). This time, I am doing this project (a subwoofer phase control) and want to put in the same case as a active audio crossover. The phase control requires +/-15vdc. The crossover is one I have from my old car audio days that uses 12vdc. Now, here is the fun part. There is a switch mode PSU in the crossover that I am just about 100% sure puts out +/-15vdc. OK.......but I doubt that it would handle the extra load of the phase control. I figure I can either come up with a dual voltage supply or (with your help) sort out the switch more PSU and cut the traces so I can build a single +/-15vdc PSU for both circuits. I know zero about switch mode supplies. I do know at least a couple ways to do a dual voltage supply though. It just seems like a single supply would be a much cleaner design though. Below is the schematic of the phase controller. Later, I will post both sides of the active crossover pcb.