Bob Axtell cotse.net> writes: > "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." "Always assuming that the Opamps have input-to-ground specification" (unlike certain popular FET input opamps ... The rule of thumb is that there is no rule of thumb. Connecting the unused + inputs to a bias source in the CMMR range and the outputs to the - inputs would be a valid way to nail it I think. Excepting for noise and other factors like RF rectification. Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist