H742 Power Supply
The H742 Power Supply, and later revision H7420, is a modular power supply system from DEC, used with the BA11-F Mounting Box. Among other uses, that mounting box is used in PDP-11/40, PDP-11/45 and PDP-11/70 systems to hold the CPU.
The main transformer in the H742/H7420 provides 20-30V AC to several DEC standard modular regulators (up to five, in spaces numbered 'A' through 'E') mounted in the H742/H7420, which provide other voltages such as +5V to the backplanes in the mounting box.
Generally the power harness supports only limited options as to which regulator can be in which spaces; e.g. the later -11/40 harness mandates that A, B and C hold H744 +5V Regulators, D holds an H745 -15V Regulator, and E may hold either an H745 or H754 +20V, -5V Regulator.
A 5409730 board in the H742, replaced by an 5411086 board in the H7420, supplies a modest amount of +15V DC power to various backplanes mounted in the BA11-F, along with a line time clock signal, and AC and DC 'power OK' signals.
A later version of the basic H742 is the H742A; the difference is not yet known.
For the H7420, in addition to the board above, the differences seem to be mainly mechanical: a larger cooling fan; a change in the orientation of the +15V supply board from horizontal to vertical (perhaps to make room for the fant); and the sheet metal enclosure holding the fan, board and transformer is a single unit, not two bolted together, as in the H742.