G704

This document is a schematic diagram for a 2 mA Level Terminator, model G704, copyrighted in 1967 by Digital Equipment Corporation.

Its stated purpose is for test and maintenance only, emphasizing that the circuits are proprietary.

The diagram illustrates a circuit primarily comprising resistors, diodes, and capacitors. It shows numerous input lines (labeled U through D) feeding into parallel resistor-diode networks, which then connect to a common line and eventually lead to an output labeled OB-15V and a common ground (OC,V GND).

General component specifications are provided:

• Unless otherwise indicated, resistors are 1/4 W, 5%, with a default resistance of 7,500 ohms. Some resistors are explicitly valued at 1,500 ohms or 47 ohms.
• Capacitors are .01 MFD.
• Diodes are generally type D664.
• A "Transistor & Diode Conversion Chart" indicates D662 is equivalent to IN645 and D664 to IN3606.

A note specifies to "USE THE ETCH BOARD OF THE 6796." The document also includes drawing, checking, and engineering dates from July 1967, with a drawing number of C CS G704-0-1, Revision A.