Protection Comparator

This document provides a detailed electrical schematic for the Protection Comparator B198 board, dated 1988 by Digital Equipment Corporation. The schematic illustrates the interconnection of various integrated circuits (DEC74H00N, DEC74H05N, DEC74H55N, DEC74H40N), transistors (DEC5009B), resistors, and capacitors. It includes a parts list with reference designations, component descriptions, and part numbers, along with a transistor and diode conversion chart. The document is intended for maintenance and test purposes.