Hey everyone. I have a radio shack learning lab, which has a bread board and 6 different voltages, 1.5-9V. My daughter and I are messing around, and are trying to get 12V's without any capacitors. I know you can just wire batteries in series, but not sure if that will work with the power supplies. I think they all use a common ground, and I know I don't want to run the voltage straight to that. We want to, say, add 3V and 9V. Is there a way to do this?