M050

This document is an electronic schematic from Digital Equipment Corporation (DEC), titled "50 MA INDICATOR AND RELAY DRIVER MO50" (Document Number CS M050-0-1, Revision D), copyrighted in 1967.

The schematic illustrates a circuit with 12 identical driver stages (Q1-Q12), each comprising transistors, multiple diodes (D1-D36), and resistors (R1-R24). It indicates input points (D2 through S2) and output points (D1O through S1O), operating with +5V and -15V power rails, and a ground (GND) connection.

The document specifies that the schematic is proprietary and intended only for test and maintenance purposes.

Accompanying the circuit diagram are:

• A Parts List detailing the DEC part numbers for the transistors (DEC6534D), resistors (1.5K 1/4W 5% CC, 15K 1/4W 5% CC), and diodes (D664).
• A Transistor & Diode Conversion Chart that cross-references DEC part numbers (DEC6534D, D664) with their EIA equivalents (MPS6534, IN3606).
• Revision history and various sign-off dates, all from May 25, 1967.