Teletype Level Converter W702

This document is a schematic diagram for the Teletype Level Converter W702, manufactured by the Equipment Corporation in Maynard, Massachusetts. The circuit features an array of resistors and diodes designed to convert signal levels, with a focus on specific voltage inputs and outputs, including a -15V supply and a -3V substrate connection. The diagram includes detailed specifications, noting that unless otherwise indicated, diodes are D664 and resistors are 1/4W, 5% tolerance, with a base resistance value of 1,000 ohms.