R302

This document is an electrical schematic titled "DELAY R302" from Digital Equipment Corporation, copyrighted in 1964. It is explicitly for test and maintenance purposes and contains proprietary circuit information.

The schematic illustrates a circuit primarily built with eight transistors (Q1-Q8), numerous diodes, resistors, and capacitors. It shows connections for +10V, -15V, and a common ground.

General component specifications are provided: resistors are typically 1/4W, 5%; capacitors are MMFD; diodes are D664; and transistors are DEC3639, unless specific types are indicated on the diagram (e.g., Q3 and Q7 are DEC3009B, some diodes are D662, and specific resistors are 1/2W from Bourns or Daystrom). A conversion chart is included, providing EIA equivalent part numbers for DEC-specified transistors (DEC3639/2N3639, DEC3009B/2N3009) and diodes (D662/1N645, D664/1N3606).

The document also features a revision history (A-PL-R302-0-0) and dates indicating its creation and review, primarily in June 1964.