Good day all. While working on a project as part of my schooling I was required to use the arduino to drive an RGB LED light bar using DMX. My first encounter with the arduino has been pleasant enough. However, when I use the design for the DMX shield given on the arduino web site my signal outputs range from 5 to 0 volts, same as the input. The inverted signal is just that, so my problem lies in trying to get the output to vary in the specified -2.5v to 2.5v range. Any thoughts on how I might be messing this up?