For some reason, I can't find (thru google) the formula for calculating t= he=20 best values of R's and C's in this circuit for a given cutoff frequency..= =2E >----`\/\/\,----o----`\/\/\,-----o------> R1 | R2 | --- --- C1 --- C2 --- | | >---------------o----------------o------> Any of you have the formula? Thanks, -Neil. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body