> 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.

Huh!!??  You're not really serious, I hope!

Just in case someone out there might get confused, multiplying the signal
by a constant of -1 does not change its frequency content or the relative
amplitudes of different frequencies in any way.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu