This is an excellent solution. I even built small boards that contain several channels of these, together with 3.3V LDO, as plug-in units for a breadboard. That way it's easy to experiment with 3.3V devices, when other stuff is still running on 5V. On Mon, Aug 27, 2012 at 5:51 AM, Neil wrote: > This works really well. If your design is unidirectional and is not > open-collector, you can do each line with one mosfet and one resistor. > Change the pull-up voltage on the output side to 3.3V or 5V as you need. > http://www.nxp.com/documents/application_note/AN10441.pdf > > Cheers, > -Neil. --=20 KPL --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .