Arduino DC Socket

How do I wire and Arduino DC Socket?

The center pin is positive the outer pin is negative. So use a plug and wire it up to a power supply. Alternatively get a power supply with a plug already fitted.

http://playground.arduino.cc/Learning/WhatAdapter

Get a 7.5V or 9V adapter, plug it in.
Need a US source with inexpensive mailing costs?
http://www.dipmicro.com/store/DCA-07510
http://www.dipmicro.com/store/DCA-0910

Just want a power cord?

Other 2.1mm inner/5.5mm outer options

Grumpy_Mike: The center pin is positive the outer pin is negative. So use a plug and wire it up to a power supply. Alternatively get a power supply with a plug already fitted.

http://playground.arduino.cc/Learning/WhatAdapter

Thanks! Which outer pin?

The jack connector has two connectors an inner and an outer. See this link power-jack-male/