With an old/cheap PC power supply, a project box from Radio Shack, and some voltage regulators, and few barrel plugs. You can regulate the 12v to 9v, the 5v down to 3v, 13.8v might be hard to get. A little bit of soildering later, and you should have more than you need.
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Next will be the Anti-Stab and Anti-Cut knife. Because people can still cut each other...
With an old/cheap PC power supply, a project box from Radio Shack, and some voltage regulators, and few barrel plugs. You can regulate the 12v to 9v, the 5v down to 3v, 13.8v might be hard to get. A little bit of soildering later, and you should have more than you need.