My goal is to power a Leonardo with a Itead 3G shield with a plug in wall transformer, for long time use, at a low price. I am using a Triad 7.5vdc 1a model WSU075-1000. With no load I measure 7.70vdc, plugged into Leonard with 3G shield I measure 7.67.
That seems good, but then I see this article about noise and voltage regulation and I get concerned about it. Or am I overthinking it and have to buy an expensive power transformer?
What is the most popular voltage, amperage, and type of wall power transformer to be used in Leonardos? I know the Leonardo's have a voltage regulator, but should I worry about noise coming from the type of power transformer I use?