Diode Gate B135

This document is a proprietary schematic diagram for a Diode Gate B135 circuit, copyrighted by Digital Equipment Corporation (DEC) in 1966.

Key information includes:

• Purpose: Furnished only for test and maintenance purposes, proprietary in nature.
• Circuit Components: It primarily consists of three 2N4258 transistors (Q1, Q2, Q3), numerous diodes (D-662, D-664), resistors, and capacitors (.01 MFD).
• Component Specifications: Unless otherwise indicated, resistors are 1/4W, 5% tolerance, and general diodes are D-664.
• Power Rails: The circuit operates with +10V (A), -15V (B), and Ground (C), and includes a -3V "strate" section.
• Manufacturing Information: References the use of the B115 etch board and includes a transistor and diode conversion chart.
• Document Details: Titled "DIODE GATE B135", part number B135-0-1, drawing revision B, and printed circuit revision C.