BINARY TO OCTAL DECODER B152

This document is a proprietary schematic diagram for a "Binary to Octal Decoder B152" circuit, copyrighted by Digital Equipment Corporation in 1967. The circuit employs nine transistors (2N4258 type) and 51 diodes (D662 type, with D664 or IN3606 as general specifications) along with various resistors, primarily 68,000 Ohm for pull-ups and 7,500 Ohm for others. It operates with power supplies of +10V, -15V, and ground. The schematic details the connections for multiple binary input lines (D, E, F, H, J, K, L) to diode-transistor logic stages, which convert these inputs into octal outputs (labeled M, N, P, R, S, T, U, V) via the transistors Q2-Q9. A transistor and diode conversion chart is provided for DEC part numbers to EIA equivalents. The schematic is furnished solely for test and maintenance purposes.