Nios2 Stratix II Development Board Power Adapter

Take a photo of the board and post it. It'll be easier for people to recognize.

Do you have the schematic for the part. If its a well-designed schematic, it should have the maximum current required for the input supply, or at least the maximum current from each of the generated supplies.

The other way to figure it out is to use a lab supply first, check things work, put in a power-consuming design, and then buy a fixed voltage supply that exceeds the measured numbers.

Cheers,

Dave