M410

This document is a schematic for the "Reed Clock M410," copyrighted in 1968 by Digital Equipment Corporation (DEC).

Key Information:

• Purpose: It is furnished for test and maintenance purposes only, and the circuits are proprietary.

• Circuit Design: The schematic details an electronic circuit incorporating various components, including:

  • Integrated Circuits (DEC7400N, DEC7474N, DEC7440N types)
  • Transistors (DEC3009B-S, DEC6534D)
  • Diodes (D664)
  • Numerous resistors and capacitors.

• Key Component - Resonant Reed Relay (KI): A significant note indicates that the variant of the KI component (Part #1209636-XX) changes according to the operating frequency. The frequency range for this clock is specified as 70-3150 Hz. If a variant is not specified, it defaults to Part #1209640-00.

• Integrated Circuit Power: All integrated circuits (ICs) are powered with +5V on Pin 14 and grounded on Pin 7.

• Supporting Tables:

  • A Parts List provides detailed descriptions and DEC part numbers for all components (e.g., resistor values, capacitor types, IC model numbers).
  • A Transistor & Diode Conversion Chart offers EIA equivalent part numbers for certain DEC components.

• Revisions and Dates: The document is Revision C, with drawing, checking, and engineering dates ranging from December 1968 to February 1969.