H777 Power Supply - Revision history

Jnc: New cat

2023-07-10T13:41:34Z

New cat

Jnc: New cat

2022-06-16T12:21:29Z

New cat

Jnc: No MS11-M's in the BA11-L -11/24

2022-01-15T21:34:38Z

No MS11-M's in the BA11-L -11/24

Jnc: +regulator boards, models, manuals, FMPS

2022-01-14T23:01:43Z

+regulator boards, models, manuals, FMPS

Jnc: Fairly complete

2018-10-16T02:07:32Z

Fairly complete

New page

The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5, +15 and -15V, with optional +20V/-5V for use with [[core memory]].

There are a large number of different versions, but they boil down to a combination of three (later four) options:

* 110V or 220V [[alternating current|AC]] input
* The optional +20V/-5V supply
* An upgraded +5V power supply (7012909) which produced 32 [[ampere|amps]] instead of the 25A of the original (7011073)

The fourth option (used in the [[PDP-11/24]] in the BA11-L box) provided +12V/-12V for use by its [[MS11-M MOS memory]] instead of the +15V/-15V.

It does not use a [[power harness]]; rather, it has a 'power distribution board' which holds the usual [[DEC power distribution connectors]]; the [[backplane]](s) mounted in the BA11-L plug in there.

The power distribution board also holds a connector for the usual DEC [[Remote Switching Control Bus]]; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes).

It was mounted longitudinally, at one side of mounting box, and included its own cooling fan.

[[Category: DEC Hardware]]

← Older revision		Revision as of 13:41, 10 July 2023
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	* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01018_Rev_F_11-24_Engineering_Drawings_Mar84.pdf 11/24 Field Maintenance Print Set] - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194		* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01018_Rev_F_11-24_Engineering_Drawings_Mar84.pdf 11/24 Field Maintenance Print Set] - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194

−	[[Category: DEC ~~Electrical~~]]	+	[[Category: DEC Power Supplies]]

← Older revision		Revision as of 12:21, 16 June 2022
Line 56:		Line 56:
	* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01018_Rev_F_11-24_Engineering_Drawings_Mar84.pdf 11/24 Field Maintenance Print Set] - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194		* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01018_Rev_F_11-24_Engineering_Drawings_Mar84.pdf 11/24 Field Maintenance Print Set] - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194

−	[[Category: DEC ~~Hardware~~]]	+	[[Category: DEC Electrical]]

@@ Line 1: / Line 1: @@
-The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5, +15 and -15V, with optional +20V/-5V for use with [[core memory]]. An optional '''H775A Battery Backup Unit''' allowed provision of power to [[Metal Oxide Semiconductor|MOS]] [[main memory]] units mounted in the BA11-L, allowing their contents to be retained during brief power outages.
+The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5V, +15V and -15V, with optional +20V/-5V for use with [[core memory]]. A later variant (used for the [[PDP-11/24]] in the BA11-L box) also provided +15V/-15V for use by its [[EIA RS-232 serial line interface|RS232]] [[asynchronous serial line]]s.
-A combination of up to 3 [[printed circuit board|boards]] provided different combinations of output voltages:
+An optional '''H775A Battery Backup Unit''' allowed provision of power to [[Metal Oxide Semiconductor|MOS]] [[main memory]] units mounted in the BA11-L, allowing their contents to be retained during brief power outages.
-* +5V Regulator - [[DEC part number]] 70-11073 or 70-12909
+A combination of up to 3 modules, composed of [[printed circuit board|boards]] with integral [[heat sink]]s, provided different combinations of output voltages:
 * MOS Regulator, +/- 15V, +5VB - 54-11601
 * Core Regulator, +20V, -5V - 54-11599
@@ Line 10: / Line 12: @@
 * 110V or 220V [[alternating current|AC]] input
-* The optional +20V/-5V supply
+* The optional +20V/-5V core supply
 * An upgraded +5V power supply (70-12909) which produced 32 [[ampere|amps]] instead of the 25A of the original (70-11073)
-The fourth option (used in the [[PDP-11/24]] in the BA11-L box) provided +12V/-12V for use by its [[MS11-M MOS memory]] instead of the +15V/-15V.
+The fourth option is the 'communication regulator', 54-13764, which provides +15V/-15V.
 The models are:
@@ Line 36: / Line 38: @@
 | -DB || 230 || 32A +5V, MOS only
 |-
-| -UA || 115 || 32A +5V, +/- 12V MOS only
+| -UA || 115 || 32A +5V, MOS, communication
 |-
-| -UB || 230 || 32A +5V, +/- 12V MOS only
+| -UB || 230 || 32A +5V, MOS, communication
 |}
-The -U variants also include a communication regulator, 54-13764, which provides +/- 15V.
+The H777 does not use a [[power harness]]; rather, it has a 'power distribution board' built into one end panel, which holds the usual [[DEC power distribution connectors]]; the [[backplane]](s) mounted in the BA11-L plug in there.
 The power distribution board also holds a connector for the usual DEC [[Remote Switching Control Bus]]; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes).