W500

This document is an electrical schematic for a "High Impedance Follower W500-0-1" circuit.

Key details include:

• Ownership & Purpose: Copyrighted in 1965 by Digital Equipment Corporation, it's proprietary and intended for test and maintenance.
• Circuit Design: The schematic illustrates a complex electronic circuit featuring numerous transistors (Q1-Q14), diodes (D1-D14), and resistors (R1-R35), with designated input (D), output (E), and power connections (+10V, -15V, GND).
• Component Specifications: A detailed parts list provides reference designations, descriptions, and part numbers for all components, including specific transistor models (DEC3009B-S, DEC999-S), diode types (D664), and various resistor values with wattage and tolerance.
• Conversion Chart: A transistor and diode conversion chart offers equivalent EIA part numbers for some DEC components (e.g., D664 to IN3606, DEC999 to MM999, DEC3009B to 2N3009).
• Dates & Revisions: The document was drawn and checked in April 1965 and is at revision B.