I am building a temporary Arduino project, and I need to order an adapter online. I am concerned that, if my adapter has lots of noise, it will affect the Arduino. Since this is temporary, I am going to buy a dirt cheap adapter to save money, but will it be "smooth"? I don't care if it breaks; two of them are much cheaper than the cheapest one that I can find on Sparkfun or a similar website.
If I hook up a fairly 'dirty' adapter, through the VIN pin or the power jack, will it filter out the noise? Will it still filter this noise out if I have a 'dirty' 5V adapter connected through the 5V pin?