Filtered Differential Amplifier

This document is a technical schematic for a Filtered Differential Amplifier designed by the Digital Equipment Corporation in 1969. The circuit utilizes an MCI520G operational amplifier as its central component. The design includes inductive-capacitive filtering on the input lines, along with a network of resistors and diodes (D664) to manage input signals. The document specifies that capacitors are rated at 100V, 5% tolerance, and resistors are 1/8W, 1% metal film, emphasizing that the schematic is intended solely for test and maintenance purposes.