Center Tap Selector G296

This document is an engineering schematic for a "Center Tap Selector" circuit (G296) manufactured by Digital Equipment Corporation in 1969.

The circuit is designed for test and maintenance purposes and features four identical transistor-based switching or signal processing stages (using MPS6531 transistors). It includes a power supply section with filtering capacitors (22µF, 35V) and diode-based voltage regulation/protection (D1–D4, D662). The schematic defines the input/output rail voltages as -15V, +5V, +10V, Analog Ground, and Chassis Ground, and provides a conversion chart for the transistors and diodes used in the assembly.