Centertap Selector G286

This document is a technical schematic and component layout for the Digital Equipment Corporation "Centertap Selector G286" circuit board.

• Schematic: The first page provides the electrical circuit diagram, detailing the configuration of transistors (including types 6534B and MPS6531), diodes (D662/D664), and resistors. It outlines input channels (labeled DO through U), power requirements (+10V/+20V and -15V supply rails), and includes a transistor and diode conversion chart.
• Layout: The second page provides a top-down physical layout of the G286 board, mapping the placement of all resistors (R1 through R27), capacitors (C1 and C2), transistors (Q1 through Q12), and diodes (D1 through D20) to assist in maintenance and testing.

The document notes that the circuitry is proprietary and intended solely for test and maintenance purposes.