INVER ER

This document is an engineering drawing and parts list for an "INVER ER" (Inverter) circuit. It features a detailed circuit schematic depicting eight transistors (Q1-Q8), numerous diodes (D1-D38), resistors (R1-R19), and a capacitor (C1), along with their interconnections and values. The document also includes a comprehensive parts list, providing descriptions, part numbers, and item numbers for each component, including the etched circuit board itself, and associated manufacturing documentation like ECO history and drilling hole cutouts. Technical notes specify resistor tolerances (1/4W, 5%), diode types (D664), and transistor types (2N4258). It also explicitly states that certain resistors (R17, R18, R19) are deleted on a specific revision (B169-YA). A semiconductor conversion chart and revision history are provided, and the document indicates a "4 1/8 FINISHED BOARD SIZE." The drawing is proprietary to Digital Equipment Corporation.