DUAL R-S FLIP-FLOP B212

This document is a schematic diagram for a DUAL R-S FLIP-FLOP B212 circuit, copyrighted by Digital Equipment Corporation in 1966. It is furnished for test and maintenance purposes, with a note indicating the circuits are proprietary. The diagram illustrates two primary flip-flop sections, each utilizing a pair of cross-coupled transistors along with associated resistors, diodes, and capacitors. The circuit also includes several delay lines and a series of diodes for signal conditioning or protection. A comprehensive parts list details the reference designations, descriptions, and part numbers for all components, including transistors (Q1-Q8), delay lines (DE1-DE4), various resistors, diodes (D1-D33), and capacitors (C1-C10). Additionally, a transistor and diode conversion chart is provided, mapping DEC part numbers to their EIA equivalents.