> Out of curiousity, does your design use resistors in the > three legs? No. I probably should if I was concerned about a failure that could fry the pins, but I need the voltage up to get transmission range. If I was driving a LED I would though, as a voltage drop wouldn't matter. Do LEDs ever fail short ? Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .