M363

This document is a schematic diagram and parts list for a Digital Equipment Corporation "VARIABLE DELAY" circuit, model M363, copyrighted 1970. It is a proprietary circuit furnished for test and maintenance purposes.

The circuit diagram details a system featuring:

• An 80ns variable delay line (DEC part 1610079-0), with its internal tapped delay line structure also detailed.
• An integrated circuit (I.C. DEC 1074H55).
• Multiple transistors (DEC 3009B, 2N4258/DEC4258, as per conversion chart).
• Various diodes (D662/1N645, FD777).
• Numerous resistors and capacitors with specified values and tolerances.

General component specifications are provided, indicating that resistors are typically 1/4W 5%, capacitors .01uF 100V 20%, and diodes D662, unless otherwise specified. Power is supplied at +5V and -15V. The document also includes a conversion chart for DEC transistor and diode part numbers to EIA equivalents, and notes it's a printed circuit board, Revision B.