James said:
what kind of power converter would i need to connect 3 of these laser
pointers to a 110 volt wall outlet?
http://store.yahoo.com/surpluscomputers/5headlaspoin.html
A 4.5V wall wart, probably at least 500 mA, with two additional
plugs spliced onto the cord. For the pointers themselves, a wood
block the size of the 3 batts, with metal tabs where the contacts
are. Connect these tabs to the mating connector, and figure out
a way to attach that to the package, and you're good to go.
Watch out that the voltage of the wall wart doesn't go too
high when there's only one pointer plugged into it. If worse
comes to worst, put a 5.1V at least 1W zener to limit the voltage.
(I assume the internal resistance of the supply will limit
the zener current - that's what limits it when there are pointers
plugged into it, after all.)
Have Fun!
Rich