M040

This document is a schematic diagram for the Digital Equipment Corporation (DEC) Solenoid Driver, model number M040-0-1, revision E, copyrighted in 1967.

Key information includes:

• Purpose: The schematic is for test and maintenance purposes only, and the circuits are proprietary to DEC.
• Circuit Components: It details a circuit using multiple transistors (Q1-Q6), diodes (D1-D2), resistors (R2-R9), a capacitor (C1), and integrated circuits labeled 'EI'.
• Default Specifications: Unless otherwise indicated, diodes are MR2066, transistors are DEC6534D, and the 'EI' integrated circuit is a DEC7420N, with specific pin assignments (Pin 7 = GND, Pin 14 = +5V). Resistors are 1/4 Watt, 10% tolerance.
• Power Rails: The circuit operates with +5V, -15V, and Ground (GND) power connections.
• Component Conversion Chart: A "Transistor & Diode Conversion Chart" provides equivalent EIA (Electronic Industries Alliance) part numbers for various DEC components, including DEC3494, DEC3790, DEC6534D, D662, and MR2066.
• Administrative Details: Includes revision history, designer/checker/engineer sign-offs with dates (e.g., M. Haller, 9-14-67), and references to a parts list (A-PL-M040-0-0).