Common DC power connectorsA six-way connector on a 'universal' DC power supply, consisting of a 4-way X connector and two individual connectors. The X-connector here provides 3.5 and 2.5 mm jack plugs and two sizes of cylindrical connector
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Connectors for supplying direct current (DC) power are poorly standardized compared to domestic AC power plugs and sockets. more...

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DC plug is a common name used for one common type of cylindrical two-conductor plug available in a range of sizes and used to power small pieces of electronic equipment. It is also used to describe some older multi-pin plugs.

Several competing standards exist for DC plugs, and in some cases incompatible plugs will fit together, or can be made to fit, possibly damaging equipment if:

the voltage is wrong; the polarity is wrong; current ratings are exceeded; power supply filtering or stability is inadequate for the equipment being powered; non-matching connectors are forced together.;

Cylindrical types

Also known as barrel connectors, concentric barrel connectors or tip connectors, small cylindrical connectors come in an enormous variety of sizes.

The intended use of these plugs is on the cable connected to a power supply. The matching jack or socket is then mounted in the equipment to be powered. Some of these jacks contain a normally closed contact, which can be used to disconnect internal batteries whenever the power supply is connected, avoiding the risk of battery leakage or explosion posed by incorrect recharging of the batteries.

Cylindrical plugs generally have an insulated tip constructed to accept insertion of a pin (but note also the internal pin in the larger size EIAJ plugs). The outer body of the plug is one contact, most often but not always the negative side of the supply. A pin mounted in the socket makes contact with a second internal contact. The outer plug contact is often called the sleeve, and the inner the tip, although the tip itself is actually non-conductive.

At least two different national standards exist, EIAJ in Japan and DIN in Germany. As well several conventions have been adopted by specific manufacturers, notably by Sony, to indicate voltage by plug size.

Some manufacturers use opposite polarity standards, and some generic power supplies cater for this by allowing the polarity to be reversed by use of a switch or an unpolarised two-pin plug and socket arrangement. These two-pin plugs seem to be standardized but official specifications are hard to find. The pins are 1.5 mm in diameter, 6 mm long and spaced 4.2 mm apart. (see Egston connector overview, page 6, number 230)

Some power supplies allow the voltage to be switched. Four-way X connectors or six-way star connectors, also known as spider connectors, with multiple plug sizes and types are common on generic power supplies. On others there are arrangements for changing the connector, with from four to nine different connectors available.

Read more at Wikipedia.org


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4 Delta Electronics 300w Power Supply Dps-300Hb $0.99 Dell Server Power Supply $125.00
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(2) Dell Poweredge 1650 275 Watt Power Supply 9J608 $14.99 Compaq Dl380 G2 400W Power Supply 194989-001 228509-001 $8.95
Zippy Emacs P2G-6460P 460W 2U Atx Server Power Supply $44.95 Dell PowerEdge 2650 Power Supply J1540 $17.00
Compaq Proliant Power Supply Ps4090 49125 25Owatts $0.99 Dell PowerEdge 800/830 420W Power Supply - Gd278 (New) $22.99
Hp Dl360 G3 Power Supply 280127-001 305447-001 $14.99 Dell J1540 PowerEdge 2650 502W Redundant Power Supply $32.99
Dell 041Yfd PowerEdge 2500 300W Hot Swap Power Supply $19.99 Ac Bel Api-7506 Power Supply Ibm NetFinity 01K9865 $7.99
Dell Poweredge 2650 500Watt Power Supply 0H694 J1540 $35.00 Compaq Delta Dps-450Cb-1 Power Supply 144596-001 Esp108 $7.00
Hp 400W Power Supply Dl380 G2 G3, Sp#:313299-001 $0.99 4G856 Dell Poweredge 1500Sc 350W Power Supply Test Work $85.95
Compaq Hp Dl380G3 400W Power Supply 313299-001 $0.99 Hp Power Supply Assembly 1200W 0957-0085 9570085 K570 $9.99
Hp Proliant Dl360 G3 Power Supply 305447-001 280127-001 $22.45 Hp Compaq Proliant Power Supply Esp115 Ps-5551-2 216068 $19.00
Dps-500Eb A 500W Power Supply Delta A76009-005 $89.99 Redundant Power Supply Dl380 G4 338022-001 New! $0.99
Dell 0H694 Power Supply for PowerEdge 2650 (J1540) $25.00 Power Supply Compaq Ps-6301-1 108859-001 . $9.99
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Prices current as of last update, 08/27/08 7:31pm.


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