G020

This document is a proprietary circuit schematic for a "Sense Amp. GO20," designed by Digital Equipment Corporation (DEC) and copyrighted in 1967 (Revision K). It is intended solely for test and maintenance purposes.

The schematic details a mixed-signal sense amplifier circuit, featuring integrated circuits (specifically MC1540G for E1/E3 and DEC7400N for E2), transistors (DEC3009B for Q1/Q2), diodes, resistors, and capacitors. It operates with multiple power rails, including +5V, -4VA, -6.2VA, and -15V.

General component specifications are provided, such as resistor wattage/tolerance (e.g., 1/4W, 5% standard; 1/8W, 1% for 'MF' type), capacitor values (.01MFD, 100V, 20%), and specific IC types with their power pin assignments (Pin 7 to GND, Pin 14 of E2 to +5V, Pin 2 of E1/E3 to +5V).

The document includes a "Transistor & Diode Conversion Chart" listing EIA equivalents for DEC part numbers (e.g., DEC3009B to 2N3009, D662 to IN645, IN753A is 'SAME'). It also references a separate parts list (A-PL-G020-0-0) and provides an instruction to use the etch board of the G021.