Level Converter M051

This document is a technical schematic diagram for a Level Converter (model M051) designed by the Digital Equipment Corporation in 1968. The circuit utilizes an array of transistors (DEC3639B) and diodes (D664) to facilitate signal conversion between +5V and -15V supply rails. The included parts list identifies the specific resistors and semiconductor components used, as well as a conversion chart cross-referencing Digital Equipment Corporation part numbers with standard 2N3639 transistors and 1N3606 diodes.