There was some discussions here before on op-amps. I ran into this = document that talks about the differences between different types of = op-amps and has lots of charts. It looked very useful to me. I was = hoping to use it to help figure out when I can substitute my LM741 for = whatever else is in the schematic. http://www.univ.trieste.it/~ramponi/teaching/EPN/materiale/epn4.pdf =20 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.699 / Virus Database: 456 - Release Date: 6/4/2004 =20 -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body