That seemed like a schematic I could vero at first, but I got a little confused.
Ok so, 2 sides of the tl072 are numbered "1,2,5" for each opamp.
Also, 6 parts of the 4049 numbered "3,2"
Voltage and ground for the opamp is not given, we all know where they connect though.
What troubles me is the "NC". As far as I know this is "not connected" right? 4049 has two "NC" pins, but I don't see what good it would be to connect something there, and in the schematic there are 3 connections to "NC"
Anyone care to explain would be nice!