M612

This document is a schematic diagram and parts list for a Digital Equipment Corporation (DEC) Power Driver Module M612, copyrighted 1970.

Key information includes:

• Proprietary Nature: The schematic is for test and maintenance purposes only, and the circuits are proprietary to DEC.
• Digital Logic: The main schematic depicts digital logic circuits composed of multiple gates (labeled E1, E2, E3) with various inputs (e.g., A1, H1, F1, B1) and outputs (e.g., D1, F2, K1, M1).
• Standard Specifications: Unless otherwise indicated, capacitors are 0.01uF, 100V, ±20%. All integrated circuits (ICs) are DEC 1074H40, with Pin 7 connected to Ground (GND) and Pin 14 connected to +5V.
• Power Supply: A +5V supply rail (A2) is shown with associated capacitors (C3, C4, C5, C1) and resistors (R1, R2). A 150uF, 15V capacitor (C1) is also specified.
• Component Layout: A diagram illustrates the three ICs (E1, E2, E3) and their connection to power supply capacitors.
• Parts List (Bill of Materials): A detailed list of components is provided, including:
  • Digital ICs (DEC1074H40)
  • Resistors (120 Ohm and 220 Ohm, 1/4W, 5%)
  • Capacitors (0.01uF, 100V; 150uF, 15V)
  • Mechanical components such as a flip-chip handle, eyelets, and the circuit board itself.
  • Entries for ECO history, assembly/drill layout, and gate hole location, indicating manufacturing details.