Integrating One Shot

This document is an engineering schematic for an "Integrating One Shot" circuit (Model M307) designed by Digital Equipment Corporation in 1970.

Key Technical Details:

• Purpose: The circuit functions as a programmable pulse generator or timer with five selectable ranges, extending from 5 microseconds up to 500 milliseconds.
• Components: The design utilizes DEC 7400-series integrated circuits (E1, E3), 9601 retriggerable monostable multivibrators (E2, E4), and 2N3009 transistors.
• Controls: It features two 5-position Spectrol switches to configure the timing range.

• Specifications:

  • Power requirements: +5V (A2) and -15V (B2).
  • Standard components: 1/4W 5% resistors and 100V 5% capacitors, with specific 78PR potentiometers used for R4 and R8.

• Configuration: The document includes a "Transistor & Diode Conversion Chart" and pin-out assignments for the integrated circuits.