On Thu, 2 Aug 2001 19:17:54 -0600 adastra writes: > > > > If the 12KHz band actually has the lowest amplitude of any of the > bands, I > > would invert the signal with an op amp configured as an inverting > > amplifier > > and then apply it to the LM567s. This would then give the 12KHz > band the > > highest amplitude, otherwise, I would proceed with Jim's > recommendations. > > > > > > You're kidding... Right? > Just imagine what happens at frequencies where the amplitude is zero! Harold PS - I used LM567's (I think they were originally NE567's from Signetics) when they first came out. They were clever chips, but I had a lot of trouble with false detection of tones and chattering outputs. FCC Rules Online at http://hallikainen.com/FccRules Lighting control for theatre and television at http://www.dovesystems.com ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body