H754 +20V, -5V Regulator - Revision history

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The '''H754 +20V, -5V Regulator''' is one of the [[DEC standard modular regulator]]s. It can produce an output [[current]] of up to 8A at an output [[voltage]] of +20V, and up to 1A at -5V. It has over-current and over-voltage detection and protection.

It was a [[switching power supply]], one of the earliest; however, the basic concept was quite different from later supplies of this type, as it was still quite low efficiency.

It takes as input [[alternating current|AC]] at a [[voltage]] of 20V-30V, runs it through a [[diode]] bridge and filter [[capacitor]] to convert it to [[direct current|DC]]. That is then used to produce a 25V output (+20V to -5V); a pair of shunt [[voltage regulator]]s then produce the two output voltages.

It took its AC input on pins 7 and 8; the +20V output was on pin 5, the -5V on pin 3, and the [[ground return]] on pin 2. Pins 1, 4 and 6 were not connected.


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[[Category: DEC Hardware]]

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−	[[Category: DEC ~~Electrical~~]]	+	==External links==
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		+	* [http://www.bitsavers.org/pdf/dec/pdp11/1140/1140_SystemManual.pdf PDP-11/40, -11/35 (21 inch chassis) system manual] (EK-11040-TM-002)- the H754 is covered in Section 6.4.4a (pg. 115 of the scanned version)
		+	* [http://www.bitsavers.org/pdf/dec/pdp11/1160/EK-11060-SV-01_1160cab_Feb78.pdf PDP-11/60 cabinet and power supply manual] - the H754 is covered in Section 3.3.3 (pp. 53-54 of the scanned version)
		+	* [http://www.bitsavers.org/pdf/dec/pdp11/1155/MP00039_1155vol1_Mar76.pdf 11/55 Vol. 1 Field Maintenance Print Set] (MP00039) - the H754 is covered on pp. 167-172 of the scanned version
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		+	[[Category: DEC Power Supplies]]

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-The '''H754 +20V, -5V Regulator''' is one of the [[DEC standard modular regulator]]s. It can produce an output [[current]] of up to 8A at an output [[voltage]] of +20V, and up to 1A at -5V. (Technically, the two trade off with each other, so if there is less +20V being drawn, more -5V can be drawn, up to a maximum of 8A.) It has over-current and over-voltage detection and protection.
+The '''H754 +20V, -5V Regulator''' is one of the [[DEC standard modular regulators]]. It can produce an output [[current]] of up to 8A at an output [[voltage]] of +20V, and up to 1A at -5V. (Technically, the two trade off with each other, so if there is less +20V being drawn, more -5V can be drawn, up to a maximum of 8A.) It has over-current and over-voltage detection and protection.
 It was a [[switching power supply]], one of the earliest; however, the basic concept was somewhat different from later supplies of this type. It takes as input [[alternating current|AC]] at a [[voltage]] of 20V-30V, runs it through a [[diode]] bridge and filter [[capacitor]] to convert it to [[direct current|DC]]. That is then used to produce a 25V output (+20V to -5V); a pair of shunt [[voltage regulator]]s then produce the two output voltages.
 It took its AC input on pins 7 and 8; the +20V output was on pin 5, the -5V on pin 3, and the [[ground return]] on pin 2. Pins 1, 4 and 6 were not connected.
 {{semi-stub}}
 [[Category: DEC Hardware]]

← Older revision		Revision as of 14:23, 21 September 2018
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−	The '''H754 +20V, -5V Regulator''' is one of the [[DEC standard modular regulator]]s. It can produce an output [[current]] of up to 8A at an output [[voltage]] of +20V, and up to 1A at -5V. It has over-current and over-voltage detection and protection.	+	The '''H754 +20V, -5V Regulator''' is one of the [[DEC standard modular regulator]]s. It can produce an output [[current]] of up to 8A at an output [[voltage]] of +20V, and up to 1A at -5V. (Technically, the two trade off with each other, so if there is less +20V being drawn, more -5V can be drawn, up to a maximum of 8A.) It has over-current and over-voltage detection and protection.

	It was a [[switching power supply]], one of the earliest; however, the basic concept was quite different from later supplies of this type, as it was still quite low efficiency.		It was a [[switching power supply]], one of the earliest; however, the basic concept was quite different from later supplies of this type, as it was still quite low efficiency.