Comparator W520

This document provides a detailed circuit schematic for the W520 Comparator, a module designed by Digital Equipment Corporation. It includes component specifications, such as resistors, transistors (DEC 3009B and DEC 3639B), and diodes (D-662 and D-664). The schematic is intended for test and maintenance purposes and features a transistor and diode conversion chart for cross-referencing to industry-standard parts.