Here is how to construct a standard application circuit based on the :
The is a 3-channel T-Network balanced insert module used in large-format broadcast consoles (like the Studer 960 or equivalent analog broadcast desks). lac781p schematic top
The circuit begins with an AC transformer, bridge rectifier, and bulk filter cap (1000-4700µF) feeding DC into of the LAC781P. Pin 2 goes directly to common ground. Pin 3 provides regulated output. Here is how to construct a standard application