Looked around forum a bit and looked at the ez-bV4/2 data sheet but haven't found the max source and sink currents for the 3.3 volt digital output pins (each pin). Any clarification on this would be much appreciated. In order to calculate the base resistor between 3.3 volt digital output pin of ezb controller and the base of the transistor one should know the max source and sink currents of each 3.3 volt digital output. Thanks much ! Rick