M051

This document is a schematic diagram for a Digital Equipment Corporation (DEC) Level Converter, model MO51 (CS M051-0-1, Revision A).

Dated October 1968, the schematic details the circuit components, including 12 transistors (DEC3639B, equivalent to 2N3639), numerous diodes (D664, equivalent to 1N3606), and various resistors (specifically 1.5K and 15K values). It illustrates the interconnections and power supply requirements (+5V, -15V, and Ground).

The document explicitly states it is provided for test and maintenance purposes and that the circuits are proprietary to Digital Equipment Corporation, copyrighted in 1968. It also includes a detailed parts list with DEC part numbers and a transistor and diode conversion chart to EIA standard part numbers.