CRYSTAL CLOCK B405

This document is a schematic diagram for a "CRYSTAL CLOCK B405" circuit, produced by Digital Equipment Corporation. It illustrates the electronic connections and components, including transistors (Q1-Q4), diodes (D1-D9), resistors (R1-R12), capacitors (C1-C6), inductors (L1-L3), and transformers (T1-T3).

A key feature is a table correlating operating frequencies (ranging from 2.0-2.45 Mc to 8.2-10 Mc) with specific inductance values for L1 (e.g., 3.3 uhy, 10 uhy) and approximate capacitance values for C1 (e.g., 56 MMFD, 120 MMFD, 560 MMFD).

General component specifications are provided, stating that transistors are typically DEC 3009 (with specific models like Q1 DEC 3639, Q4 DEC 2219), capacitors are generally .01 MFD (with C5 specified as 120 MMFD), resistors are 1/4W, 10% (though some are 5%), and diodes are D-662 (with specific models like D4, D6 as FD777, and D7, D8 as D-664). Chokes L1 and L2 are identified as Deciductors. The circuit also indicates power inputs at +10V and -15V. The document was drafted by I. Hahn on July 28, 1965, and engineered by R. Doane on August 5, 1965.