Power Supplies Types 728, 728A

This document provides technical specifications for the Types 728 and 728A power supplies, which are designed for mounting in DEC computer cabinets. Key details include:

• Electrical Specs: The units provide +10V and -15V (floating) outputs. Current capacity varies based on whether one or both channels are loaded, with a total output limit defined by the formula: 5(I₁₀) + 6(I₁₅) = 53.
• Regulation: The units feature line and load regulation to maintain stable output voltages and low ripple under varying conditions.
• Compatibility: The 728 is electrically identical to the 783 but features a shorter chassis. The 728 is designed for 60 cps input, while the 728A supports various voltages at 50 cps.
• Mechanicals: The hardware features a chromicoat finish with screw terminals for power input and tab terminals for output.