W511

This document is a schematic diagram for the Digital Equipment Corporation (DEC) Negative Level Converter W511, identified by the number W511-0-1, Revision B.

Key information from the document includes:

• Purpose & Proprietary Nature: The schematic, copyrighted in 1965 by DEC, is furnished exclusively for test and maintenance and is proprietary.
• Circuit Overview: It details a transistor-diode logic circuit featuring various resistors (R1-R12), diodes (D1-D26), transistors (Q1-Q4), and a capacitor (C1).
• Power Rails: The circuit operates with +10V (A), Ground (C), and -15V (B) power supplies.
• Input/Output: It has multiple input points (E, F, H, J, K, L, N, P, R, S, T, U) and output points (D, V).

• Component Specifications:

  • Unless otherwise indicated, resistors are 1/4 Watt with 10% tolerance.
  • Default diodes are D-664.

• Transistor & Diode Conversion Chart: Provides DEC part numbers with their EIA equivalents, such as:

  • D-662 = IN645
  • D-664 = IN3606
  • D-670 = IN3653
  • DEC3009B = 2N3009
  • DEC2894-IB is listed as having no EIA equivalent.

• Documentation: A separate parts list is referenced (A-PL-W511-0-0).

• Dates: Design and check dates are primarily in February 1965.