M308

This document is a detailed electrical schematic for an "INTEGRATING ONE SHOT M308" circuit board, copyrighted by Digital Equipment Corporation (DEC) in 1971.

The schematic illustrates a monostable multivibrator (one-shot) design, which generates a single output pulse of a predetermined duration when triggered. The "integrating" aspect suggests the pulse timing is determined by RC time constants within the circuit.

Key components include:

• A variety of discrete components such as resistors, capacitors, diodes (e.g., D003, D664), and transistors (specifically DEC4258 and DEC3009B types).
• Several integrated circuits (ICs), including:
  • E1: DEC974H01
  • E2: DEC74H10 (Triple 3-input NAND gate)
  • E3: DEC974H74 (Dual D-type flip-flop)
  • E4: DEC74H04 (Hex Inverter)

The circuit operates from a +5V power supply and features clearly marked inputs (e.g., S1, E2) and "ONE" outputs (S2, T2).

Accompanying the schematic is a comprehensive parts list detailing the specific components, their values, and quantities required for assembly, as well as a transistor and diode conversion chart. General specifications for unmarked components (capacitors, resistors, diodes, transistors) are also provided.