M321

This document is a proprietary schematic for a "TAPPED DELAY LINE M321", designated with part number M321-0-1, created by Digital Equipment Corporation and copyrighted in 1970.

The schematic details an electronic circuit that includes:

• Logic gates (e.g., DEC1074H40) and various discrete components like transistors (DEC4258, DEC3009B), diodes (FD777, D662), resistors, and capacitors.
• A central Tapped Delay Line (DL-5183), identified as DL1, offering multiple delay outputs ranging from 25ns to 225ns.
• Connections for various power supplies (+5V, -0.8V, -15V, +3V).

In addition to the circuit diagram, the document provides:

• A comprehensive Bill of Materials (BOM) listing all components, their part numbers, descriptions, and quantities (e.g., ICs, transistors, resistors, capacitors, etched circuit board, handle, eyelets).
• General specifications for standard components (e.g., capacitors .01uF 100V 20%, resistors 1/4W 5%, diodes D662).
• A Transistor & Diode Conversion Chart cross-referencing DEC part numbers with EIA equivalents.

The document explicitly states that it is for test and maintenance purposes only and that the circuits are proprietary. It was drawn by Nancy Moore on December 16, 1970, and is at Printed Circuit Revision B.