In case the equipment you are about to connect your microphone has "phantom power" for the microphones, you don't need extra power supply. This "phantom power" is very common in mixers, consoles e.t.c. If you have any doubts, clarify me the brand / model of the device that you are going to use C-3 with.
Otherwise you can use the Behringer PS400 phantom power supply (here are some links for this on
homepage and
amazon) The cost is less than $30, as you can see.
In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution. Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114