High quality switching 'wall wart' AC to DC 9V 1A wall power supply manufactured specifically for portable electronics devices. These are switch mode power supplies which mean the output is regulated to 9V (no more 14V outputs!) and the capable output current is much higher (1A!).
These will power most projects that don't require more than 1A of current. Center-positive 5.5x2.1mm barrel connector.
Works with 100-240VAC inputs.
European Style Plug