G847

This document is a schematic diagram for a Dual Motor Voltage Control (Model G847), copyrighted in 1969 by Digital Equipment Corporation.

Key features and information include:

• Purpose: Furnished for test and maintenance purposes, noting the circuits are proprietary.
• Circuit Design: It depicts two identical control circuits, each featuring a combination of transistors (e.g., 2N3715, MPS A55, MPSA05), diodes (e.g., D672, 1N5624), and various resistors.
• Connectivity: Includes a connector with inputs for +45V, +15V, GND, and -15V, and outputs labeled E1 OUT and E2 OUT. Fuses F1 and F2 (5 Amp) protect the outputs.

• Component Specifications:

  • Diodes are generally D672.
  • Resistors are 1/4W, 10% tolerance unless otherwise indicated.
  • Specific DEC part numbers are provided for the main connector (#1209340) and its pins (#1209456).
  • Note on Transistor Packages: Q1, Q2, Q4, Q5 have varied packages depending on the source (Motorola MPSA05/MPSA55, GE GPSA05/GPSA55), with bottom view diagrams provided.

• Conversion Chart: A "Transistor & Diode Conversion Chart" cross-references DEC part numbers with EIA equivalents (e.g., D672 = 1N3653, 2N3715 = NONE).

• Revision History: The document includes a revision log detailing changes, dates, and responsible engineers.
• Identification: The document's full number is G847-0-1, Revision D, with a printed circuit revision E.