Crystal Clock B405

Summary: This document is a technical schematic for the "Crystal Clock B405," designed by Digital Equipment Corporation in 1965. The schematic illustrates an electronic circuit involving transistors (DEC 3009, 3639, and 2219), diodes (D-662, FD777, and D-664), and various resistors, capacitors, and inductors. Included is a frequency reference table that correlates specific frequency ranges (from 2.0 Mc to 10 Mc) with their corresponding inductor (L1) and capacitor (C1) values, providing the necessary specifications for calibrating the clock's timing output.