DIODE GATE DRIVER B685

This document is a proprietary schematic diagram, copyrighted in 1967 by Digital Equipment Corporation, for a "DIODE GATE DRIVER B685." The schematic, intended solely for test and maintenance purposes, details the circuit layout using various transistors (including 2N4258 and DEC3009B/2N3009), diodes (such as D662/1N645 and D664/1N3606), resistors, and capacitors. It specifies resistor tolerances (1/4W, 10%), capacitor values (.01 MFD), and indicates operating voltages of +10V and -15V with a ground reference. A conversion chart for transistor and diode part numbers (DEC to EIA) is also provided.