W520

This document is a schematic diagram for the Digital Equipment Corporation (DEC) COMPARATOR W520, copyrighted in 1965.

Key information includes:

• Purpose: Furnished for test and maintenance purposes only, with the circuits noted as proprietary.
• Circuit Details: The schematic illustrates an electronic comparator circuit primarily composed of numerous transistors (DEC6B, DEC3009B/2N3009, DEC3639B/2N3639), diodes (D-662/1N645, D-664/1N3606), and resistors.
• Component Specifications: Unless otherwise indicated, resistors are 1/4W, 5% tolerance.
• Power Rails: The circuit operates with +10V, 0V (Ground), and -15V power supplies.
• Conversion Chart: A table is provided to convert DEC transistor and diode part numbers to their EIA equivalents.
• Administrative Data: The document includes the drawing number (CS W520-0-1, Rev C), revision history, and details of the personnel involved in its creation, drawing, checking, and engineering in late 1965.