While on the Pericom website, I stumbled across an excellent EMI Appnote (#11) that states categorically: "If there are OpAmps in a design, terminate unused opamps in dual or quad packs by grounding the positive input to ground, then connecting the negative input to the output." Pretty blunt. --Bob A -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist