[Herald1360]

A barefoot TO220 7812 should just about cope with a watt or so. Add a little twisted fin heatsink and it'll be fine. An added series resistor as suggested would give it an easier time.

Or you could do it with something like a TIP41x with a 12v zener and a series 1N4148 etc up its tail. Component count about the same..... output a bit soggier!