G800

This document is an electronic schematic titled "CONTROL FOR 739 POWER SUPPLY G800," created by Digital Equipment Corporation and copyrighted in 1964. It is provided for test and maintenance purposes and details proprietary circuitry.

The schematic illustrates a control circuit featuring multiple transistors (Q1-Q5), numerous diodes (D1-D21, with various D6xx and IN429 types), resistors (with specified values and tolerances, typically 1/4W 5% unless otherwise indicated), and capacitors (C1-C4). It includes inputs for a positive coefficient thermistor (330Ω at 25°C) and outputs such as an "O.K. SIGNAL" and a connection "TO SERIES REGULATOR BASE." Key power rails indicated are +10V, -3V, and -15V, along with ground.

A "TRANSISTOR & DIODE CONVERSION CHART" is included, providing equivalent EIA part numbers for the specified DEC components. The schematic was drawn, checked, and engineered by H. Porter, N. Perryman, and D. Wardimon, respectively, on October 17, 1964. The document also contains a revision history table.