hi every one,
a friend got this board (arduino uno) on my belalf (i have not seen it yet) and he says it did not come with a power supply pack and i want to build one myself for it. does any one know of the Voltage and current ratings of it. thanks. 
Generally, you can get all the info you need if you simply look. Iād start here: http://www.sparkfun.com/products/9950 since this an SFE forum. From the arduino home page you can get to the hw ref page for the uno and it has a nice little section on powering the uno which includes 3 possible ways.
thanks Phiba.