R123

This document is a proprietary schematic diagram titled "DIODE GATE R123" from Digital Equipment Corporation, copyrighted in 1965. It is provided for test and maintenance purposes only, with the circuits being proprietary.

The schematic illustrates a circuit comprising six identical diode-transistor logic gate sections (Q1-Q6), connected to common +10V, Ground, and -15V power supplies.

Key components include:

• Transistors: DEC 3639 (EIA 2N3639)
• Diodes: D-664 (EIA 1N3606) and D-662 (EIA 1N645)
• Resistors: Generally 1/4 Watt, 5% tolerance, with specific values of 100,000 ohms and 15,000 ohms indicated.

The design is intended for use with an etch board (W101) and includes a transistor and diode conversion chart. The document reflects revision B of the printed circuit design, with drawing and engineering dates in April 1965.