DEC standard modular regulators

The DEC standard modular regulators (not a formal DEC term) were a series of modular power supply modules, used primarily in the H742 Power Supply of the BA11-F Mounting Box and the H765 Power System of the BA11-K mounting box. (They are also occasionally found in other locations.)

Supported regulators include:

• H744 +5V Regulator (and later versions, H7440 and H7441)
• H745 -15V Regulator
• H754 +20V, -5V Regulator

These regulators all used switching techniques (likely one of the earliest switching power supply designs); they differed from later switching supplies (which generally dispense entirely with a large transformer on the AC input, in that they take as input 30V AC supplied by the 'mother' system using a large (and heavy!) isolation/step-down transformer.

The 7014251 +12VB and +5VB Battery Backup Regulator, used with the H775D Battery Backup Unit, is another in the series.