G826

This document is a proprietary electronic schematic titled "REGULATOR CONTROL G826," copyrighted 1967 by Digital Equipment Corporation, and intended for test and maintenance purposes.

The schematic details a complex control circuit utilizing a variety of electronic components. It features numerous discrete transistors (e.g., DEC6534B, DEC3568, DEC3790-S), diodes (e.g., D662, D664, D671, IN753, MR2064), resistors, and capacitors. The circuit also incorporates integrated circuits (ICs): E1 and E3 are specified as DEC7400N, and E2 as DEC7440N, with standard TTL power configurations (Pin 7 = GND, Pin 14 = +5V).

General component specifications indicate resistors are typically 1/4W, 5% tolerance, and capacitors are 0.01 MFD, unless otherwise marked. The circuit operates across multiple voltage rails including +5V, -6V, -15V, -30V, and Ground. Key features include various transistor amplifier stages, a Bourns Trimpot (R28) for adjustment, and a connection for a temperature coefficient thermistor for potential temperature compensation. A "Transistor & Diode Conversion Chart" provides EIA equivalents for DEC-specific part numbers. Several test points are marked throughout the diagram.