Depends on what you want to do with the OP Amps. A great general book by Sams is the IC Op-Amp Cookbook by Walter G. Jung. There are at least 2 others at SAMS. One is just for building active filters and the other is for phase-locked loops, both of which are in my other office. When I get over there Saturday I'll dig them out and send you their names and authors. Mike At 09:07 PM 9/5/00 -0400, you wrote: >Don Lancaster's book is a must have. Can't remember the name. >www.synergetics.com > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics