Variable Clock R451

This document is a technical schematic for a Variable Clock module (R451) manufactured by Digital Equipment Corporation. It details the circuit design, which includes an array of transistors (DEC 3639), diodes (D-662), and various resistors and capacitors. The diagram maps out input and output connection points, including terminals for "Enable Gate Input," "Clock Out," "Pulse Out," "P.A. Enable," and "P.A. Diode Input." The document also includes notes regarding component specifications, a transistor and diode conversion chart, and references to the associated parts list (A-PL-R451-0-0) and etch board requirements (R450).