In my crappy high school science lab they have these black boxes that you can rig wires up to and can create a circuit from, they call them "power packs".

As far as I care they're glorified car battery chargers but I need one all the same, preferably made using AC current, any ideas?

Do you want to Do It Yourself?

Laboratory equipment = Laboratory Tips

1 volt? 3v 6v 12v 24v ???????? a mix? A\C or D\C output ? or both how much $ ya wanna spend etc. etc.

Laboratory equipment = Laboratory Tips

Home-made variac box? DIY.