Is there anything wrong with this? +3V ---. | R | L ANNODE E D CATHODE | +5V Logic output ---. When the output is high, the LED will be reverse biased by around 2V, whi= ch is within its spec (5V). The reason I want to do this is that the Rabbit Core Module (uP + Memory = + Ethernet) I am using is a 3V device, but on board, it has a 5V out charge pump for its Ethernet chip. I am using that chip=92s link status output = to drive an LED on my board which only has 3V availale. Thanks, --BobG -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics