Difference between revisions of "H742 Power Supply"
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It also supplies 20-30V AC to several [[DEC standard modular regulator]]s (up to five, in spaces numbered 'A' through 'E') mounted in the H742, which provide other voltages such as +5V to the backplanes in the mounting box. | It also supplies 20-30V AC to several [[DEC standard modular regulator]]s (up to five, in spaces numbered 'A' through 'E') mounted in the H742, which provide other voltages such as +5V to the backplanes in the mounting box. | ||
| − | Generally the | + | 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 Regulator]]s, D holds an [[H745 -15V Regulator]], and E may hold either an H745 or [[H754 +20V, -5V Regulator]]. |
Later versions of the basic H742 are the H742A and H7420A; the differences are not yet known. | Later versions of the basic H742 are the H742A and H7420A; the differences are not yet known. | ||
| + | |||
| + | ==See also== | ||
| + | |||
| + | * [[H765 Power System ]] | ||
Revision as of 02:56, 19 September 2018
The H742 Power Supply is a modular power supply system from DEC, used in PDP-11/40, PDP-11/45 and PDP-11/70 systems mounted in a BA11-F Mounting Box.
The H742 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.
It also supplies 20-30V AC to several DEC standard modular regulators (up to five, in spaces numbered 'A' through 'E') mounted in the H742, 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.
Later versions of the basic H742 are the H742A and H7420A; the differences are not yet known.
