50 Ohm Or Bus Driver B683

Summary This document is an electrical schematic for a Digital Equipment Corporation "50 Ohm or Bus Driver" circuit (B683), dated March 14, 1967. The circuit is designed to drive three distinct output channels (labeled Output 1, 2, and 3) using a combination of transistors (2N4258, DEC 3009B, and DEC 2904A) and diodes (D662, 1N752A). The schematic includes a transistor and diode conversion chart and specifies that all resistors are 1/4W with a 5% tolerance (unless otherwise indicated), while all general diodes are D664. The circuit operates using a +10V and -15V power supply.