(Insert picture of jaw hanging open) That's amazing. The parts database has hundreds of esoteric things I've never even heard of - yet you're saying it lacks basic parts like a diode rectifier? That's... insane. I would have thought that basic components like that would have been the very first things added. Why would something that simple and essential have been left out?
I can't find a 12 volt voltage regulator, either. Is that something else that's missing? (Next you'll tell me you have to make your own resistors!)