R303

This document is a schematic diagram for an "Integrating One-Shot R303" circuit, copyrighted by Digital Equipment Corporation in 1965. It is provided for test and maintenance purposes only, as the circuits are proprietary.

The schematic details a complex electronic circuit utilizing various transistors (e.g., Q1-Q10, with types like DEC 3639C, 2N3605, DEC3009), diodes (e.g., D-664), resistors (with specified values and 5% tolerance in many cases, though general notes indicate 1/4W, 10% as default), and capacitors (e.g., 100 MMFD, .001, .0022). Power rails indicated are +10V(A), 0V, and -15V, along with a common ground (CGND). A variable resistor, R9 (Bourns or Weston 275P), is also included.

General component specifications are provided, noting that unless otherwise indicated, resistors are 1/4W, 10%, diodes are D-662 (default) or D-664, and transistors are DEC 3639B (default). A "Transistor & Diode Conversion Chart" maps Digital Equipment Corporation (DEC) part numbers (e.g., DEC3639B, D664) to their EIA equivalents (e.g., 2N3639, 1N3606).

The document is identified as R303-0-1, Revision K, and was initially drawn by I. Mahn on April 5, 1965, with checks and engineering by R. Silverman and R. Doane on April 16, 1965. A revisions table outlines the history of changes to the schematic.