Solenoid Driver W040

This document is an engineering schematic for a "Solenoid Driver W040" circuit, produced by Digital Equipment Corporation in 1964. The circuit consists of two identical driver channels featuring DEC 3494 and DEC 3790 transistors, along with various diodes (MR 2066 and D-664) and resistors. The diagram details the input/output pin configurations (labeled D through V) and includes standard electrical notes specifying component tolerances (1/4W, 10% for resistors) and general diode specifications.