Schmitt Trigger W501

This document is a technical schematic for the Schmitt Trigger module W501, manufactured by the Digital Equipment Corporation in 1964. It includes a complete circuit diagram, a comprehensive parts list detailing transistors (DEC3009B, DEC999), diodes (D662, D664), resistors, and a capacitor. The document also provides a transistor and diode conversion chart and notes that the schematic is intended for test and maintenance purposes.