JAM FLIP-FLOP B213

This document is a proprietary schematic diagram for the JAM FLIP-FLOP B213 circuit, intended solely for test and maintenance purposes. Copyrighted by Digital Equipment Corporation in 1966, the circuit utilizes a range of active and passive components.

The schematic illustrates a complex transistor-based logic circuit, likely composed of multiple stages to achieve flip-flop functionality. Key components include numerous transistors (Q1 through Q14), diodes (D1 through D32), resistors (R1 through R30), and capacitors (C1 through C10). General specifications indicate that resistors are typically 1/4W, 5% tolerance (with some 10% specified), diodes are D664 (with some D662 components), and transistors are DEC 3009B or DEC 3639B.

The circuit operates with several voltage rails, including +10V, -3V, -3.5V, -2.2V, -4.2V, -15V, and ground, connected via various labeled points (e.g., P, S, N, E, D, U, V, K, L, T, J). A conversion chart provides equivalent EIA part numbers for the DEC-specified transistors and diodes, such as 2N3009 for DEC 3009B, 2N3639 for DEC 3639B, IN645 for D662, and IN3606 for D664. The document also includes revision history and design dates from February 1966.