W301

This document is a schematic diagram for the Digital Equipment Corporation (DEC) Delay Line W301, dated January 5, 1967 (Copyright 1967).

Key information includes:

• Circuit Function: It depicts the internal circuitry of a delay line module, designed with multiple tapped delay elements (DE1 through DE4) and associated transistor-diode logic stages.

• Components:

  • Delay Elements (DE1-DE4): Specified as DEC #330-25E-6, each with taps at various delay points (05, 10, 15, 20).
  • Transistors: Primarily DEC3009B and DEC3639B (e.g., Q1-Q8).
  • Diodes: Predominantly D662, D664, and D64 (general specification).
  • Resistors: Generally 1/4W, 10% tolerance, with specific values indicated.
  • Capacitors: Typically 0.01 MFD or 68 MMFD (unless otherwise indicated).

• Power Rails: The circuit operates with +10V (AA, BA), Ground (AC, BC), and -15V (AB, BB) power supplies.

• Identification: The module's part number is W301-0-1, Revision B, with a printed circuit revision C. A parts list (A-PL-W301-0-0) is referenced.
• Transistor & Diode Conversion Chart: Provides EIA equivalents for DEC part numbers (e.g., DEC3009B = 2N3009, D662 = IN645).
• Disclaimer: The schematic is furnished for test and maintenance purposes only, and the circuits are proprietary to Digital Equipment Corporation.