W002

This document is an electronic schematic titled "CLAMP LOADS WOO2," produced by Digital Equipment Corporation and copyrighted in 1964. It is specifically intended for test and maintenance purposes, with the circuits being proprietary.

The schematic illustrates:

• Two main arrays of diode-resistor pairs: One set (D2-D15 with R2-R15) and another (D1-D13 with R1-R13), primarily featuring 7,500-ohm resistors and connected to various labeled points (D through M, and N through V).
• A voltage clamping/regulation network: This vertical section includes a series of D-662 diodes (D16-D23), 1,500-ohm resistors (R16, R17), and .01 MFD capacitors (C1, C2, C3). This network connects to a -15V supply, an "OC GND" (ground), and a -3V "STRATE" (substrate/reference) line.

General specifications state that, unless otherwise indicated, resistors are 1/4W, 5%, and diodes are D-664. A Transistor & Diode Conversion Chart provides cross-references, listing DEC's D662 as EIA IN645 and D664 as EIA IN3606.

The document was drawn by A. Ouellette, checked by N. Perryman, and engineered by B. Scudder in July-August 1964, and is at revision level 3.