> the opamp from output to inverting input. So small, in fact, I used > a "gimmick" capacitor to fine tune the response :^) So how long was the gimmick? Tim Daugard AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL http://members.cox.net/synthfred/h_toctop.htm (Fred's online edition)