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Topic: Power supply

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	Howstuffworks "How PC Power Supplies Work"
		In a personal computer (PC), the power supply is the metal box usually found in a corner of the case.
		Power supplies, often referred to as "switching power supplies", use switcher technology to convert the AC input to lower DC voltages.
		The power supply also has a circuit that supplies 5 volts, called VSB for "standby voltage" even when it is officially "off", so that the button will work.
	computer.howstuffworks.com /power-supply.htm (475 words)

	Power supply - Wikipedia, the free encyclopedia
		A power supply (sometimes known as a power supply unit or PSU) is a device or system that supplies electrical or other types of energy to an output load or group of loads.
		Constraints that commonly affect power supplies are the amount of power they can supply, how long they can supply it for without needing some kind of refueling or recharging, how stable their output voltage or current is under varying load conditions, and whether they provide continuous power or pulses.
		ATX power supplies also are designed to turn on and off using a signal from the motherboard (PS-ON wire), and provide support for modern functions such as the Standby mode of many computers.
	en.wikipedia.org /wiki/Power_supply (1530 words)

	Uninterruptible power supply - Wikipedia, the free encyclopedia
		An uninterruptible power supply (UPS), sometimes called an uninterruptible power source, is a device which maintains a continuous supply of electric power to connected equipment by supplying power from a separate source when utility power is not available.
		Rotary uninterruptible power supply equipment contain a motor-generator system with a large flywheel that keeps the generator rotating and producing electric power while an auxiliary motor is started at the moment of power interruption.
		The other type is re-engineered switching power supplies that utilize dual power sources of AC and/or DC as power inputs and have an AC-DC built-in switching management control units.
	en.wikipedia.org /wiki/Uninterruptible_power_supply (2515 words)

	Buy Computer Power Supply, ATX Power Supply, Server Power Supply in Canada, Quebec. Montreal
		POWER SUPPLY SPI 300W ATX V2.0 300PN 24-PIN PA LGA775 BALL BEARING
		POWER SUPPLY ZIO 350W ATX NOISE FREE POWR SUPPPLY
		POWER SUPPLY ZIO 400W ATX NOISE FREE POWR SUPPPLY
	power-supply.allthepc.com (347 words)

	PC Power Supply Failure Diagnostics - Computer ATX Power Supply Troubleshooting and Repair
		If your power supply features a heavy cord running forward to a large switch on the case front, with four connections, you have an old AT style supply and potentially deadly live line voltage is present at the switch.
		This live power is supplied to the adapter slots, so replacing adapters with the power cord plugged in may damage the motherboard or adapters.
		Common power supply problems unrelated to the boot process are noisy operation and unstable voltages, both of which are a reason to replace the supply.
	www.fonerbooks.com /power.htm (3179 words)

	Power Supply Tutorial \| Hardware Secrets
		The power supply is also present in the PC cooling process, facilitating the airflow inside the case.
		The size of the transformer and the capacitance (and thus the size) of the electrolytic capacitor are inversely proportional to the frequency of the input AC voltage: the lower the AC voltage frequency, the bigger the size of those components and vice-versa.
		Since linear power supplies still use the 60 Hz (or 50 Hz, depending on the country) frequency from the power grid — which is a very low frequency —, the transformer and the capacitor are very big.
	www.hardwaresecrets.com /article/181 (874 words)

	Power Supply, Computer Power Supply, DC Power Supply, Laptop Power Supply at TigerDirect.com
		Power Supply, Computer Power Supply, DC Power Supply, Laptop Power Supply at TigerDirect.com
		The X3 is super efficient, using less electricity than other power supplies when providing power to your computer and it generates less heat.
		Xion / 600-Watt / ATX / 140mm / SATA-Ready / SLI-Ready / 20/24-Pin / Power Supply
	www.tigerdirect.com /applications/Category/category_tlc.asp?CatId=106 (517 words)

	DC Power Supply
		Variable dc power supply, programmable dc power supply, and dc digital power supply or 12v dc power supply, as well as ac output power supply from Extech Instruments, Unisource Corporation, and Protek.
		This DC Power Supply is solid state, compact, regulated supplies suitable for many applications including bench testing, field service, hobby and telecommunication equipment use.
		The 382200 Digital Single Output DC Power Supply is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
	www.valuetesters.com /DC-Power-Supply.php (350 words)

	Rackmount Chassis, Power Supply and Industrial Computer Solutions (Site not responding. Last check: 2007-11-07)
		Since the power supply is expecting certain sensing circuit feedback to regulate the output voltage, munaully starting it without attaching it to the motherboard could cause damage to the power supply.
		If you power supply has power connected to it and power switch on the power supply is on, you will see the fan is turnning by now.
		Power supply air flow direction: It is important to choose a power supply with a fan that moves air in the proper direction.
	www.compute-aid.com /atxspec.html (2382 words)

	Power Supply (Site not responding. Last check: 2007-11-07)
		Power supply is switched to the wrong voltage.
		When testing or installing a new power supply, the supply is plugged directly into the motherboard without plugging another device such as a floppy drive.
		Something other than the power cord must be plugged into the power supply or the power supply will short out.
	www.decosystech.com /Techsupport/powersupply.htm (179 words)

	Power Supply Manufacturer: Integrated Power Design, Inc
		We are dedicated to delivering power supply solutions using advanced research and development combined with sophisticated manufacturing automation.
		Unlike a typical power supply manufacturer, IPD power supplies meet a wide range of applications, both in their power input/output specifications and also in their mechanical layout or footprint.
		Our power supply designs are for a global market place, which include industrial and medical applications.
	www.ipdpower.com /power_supply_manufacturer.html (414 words)

	12 Volt 30 Amp Power Supply
		The dissipation in each power transistor is one sixth of the total load, but adequate heat sinking is still required.
		In the event that the power transistors should fail, then the regulator would have to supply full load current and would fail with catastrophic results.
		The input current to the regulator is fed via the emitter resistor and base emitter junctions of the power transistors.
	www.mitedu.freeserve.co.uk /Circuits/Power/1230psu.htm (532 words)

	Power Supply
		Power supplies are rated by the wattage output.
		It supplies a steady 5 volt power to the motherboard even when the rest of the system is off, thus giving the system the ability to boot itself through software.
		Most importantly if you are using a new case, you might have to connect the supply to the power switch on the front of the case.
	www.pcmech.com /show/case/144 (1297 words)

	ATX power supply standard review. ATX power supply. (Site not responding. Last check: 2007-11-07)
		Not all power supplies will initially come with this new standard fitting so that you can use the power supply with your existing ATX motherboard but will come with a 20 to 24-pin adapter cable such as the one in the latest Thermaltake PurePower 680w power supply.
		Power supply efficiency for full and typical loading is to be a minimum of 70% and is recommended to be 75% at full loading and 80% at typical loading while light loading is to be 60% and recommended is to be 68% efficiency.
		This is obviously a lot of power being wasted in conversion from AC mains voltage to DC supply voltage including the fans needed to pass the heat out of the PSU.
	www.a1-electronics.net /PcHardware/GenCompInfo/2005/ATX_PowerSupply_Jan.shtml (487 words)

	Power Supply: How To Diagnose Power Supply Problems - ACME HOW TO.com
		The power supply has failed and needs to be replaced.
		If the power supply does not supply the proper, stable voltages to the various components it may prevent the PC from starting.
		The power supply could be overheating, check that the fan is working.
	www.acmehowto.com /howto/pc/hardware/power/diagnose.php (215 words)

	ATX Power Supply Problems - The Midnight Question Archive
		The ATX power supply replaces the P8 and P9 connectors of the AT design with a single 20 lead connector, which has added a signal line for turning the power supply on and off, and three new 3.3V lines.
		A good ATX power supply provides over 700mA at +5V even in it's "off" state, necessary for LAN adapters to provide a "wake on LAN" interrupt, not to mention keeping the motherboard alive enough to cope with the "Wake on LAN", "Wake on Modem" and the software power switch on the front of the case.
		The power supply operates by sensing the voltage accross the load and shutting off when it goes out of regulation (high), which generally occurs at a frequency of 20KHz to 40KHz.
	www.daileyint.com /hmdpc/mqps.htm (7691 words)

	The Transcendent Sound Balanced Power Supply 1000VA
		Power lines often have a type of noise called common mode noise which is present on both the neutral and hot wire.
		The Balanced Power Supply creates a new ground called a derived ground, that decouples equipment connected to it from these circulating ground currents in the rest of the house wiring.
		The balanced power supply provides a very low impedance to the connected equipment which shorts out this high frequency noise.
	www.transcendentsound.com /power_supply.htm (639 words)

	How to Convert a Computer ATX Power Supply to a Lab Power Supply - WikiHow
		"Harvest" a power supply from a computer by opening up the case of the computer, locating the gray box that is the power supply unit, tracing the wires from the power supply to the boards and devices and disconnecting all the cables by unplugging them.
		Drill holes in a free area of the power supply case by marking the center of the holes with a nail and a tap from the hammer.
		A supply that you have pulled may look dead because it does not have a load on its outputs and the enable output may not be grounded (green wire).
	www.wikihow.com /Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply (1387 words)

	Power Supply (Site not responding. Last check: 2007-11-07)
		Some power supplies have an additional outlet on the back that can be used to provide power to the monitor.
		A higher wattage power supply doesn't hurt anything, but a lower wattage power supply can cause problems for people with lots of devices connected to their computer.
		It is important to make sure that a power supply will connect properly to your motherboard before you purchase it.
	www.kids-online.net /learn/click/details/ps.html (290 words)

	Xbox 360: How to connect and disconnect the Xbox 360 power supply
		If the light is not illuminated but the power supply is connected to the wall socket, there may be a problem with the power supply.
		The light on the power supply remains illuminated orange until you disconnect the power supply from the wall socket.
		This is especially important where the power cords connect to the wall socket, the power supply unit, and the console.
	support.microsoft.com /kb/906205 (695 words)

	Electronic Power Supply Solutions From IPD
		They are designed to meet a wide range of applications, both in their power input/output specifications and also in their mechanical layout or footprint.
		This allows us to provide a compact electronic power supply with high power densities and features that are required by most demanding applications.
		Our electronic power supply designs are for a global market place, which include industrial and medical applications.
	www.ipdpower.com /electronic_power_supply.html (329 words)

	PC Power Supply
		Once you have the power supply out of the PC case, you have to decide which of three basic types of power supplies you have.
		If the switch for the power supply is a paddle switch on the side of the power supply itself you have an older AT style power supply.
		This old style power supply (PS) is much simpler to make work and generally the case is larger so you have more room to work.
	www.marcee.org /Articles/PCPowerSupply.htm (2348 words)

	RP8300 Redundant Power Supply Installation Sheet
		The redundant power supply kit should contain the following mounting brackets.
		First, remove the two screws located on the back of the redundant power supply.
		Align the redundant power supply with the chassis’ power supply mounting holes.
	www.rackmount.com /pcwsupport/PowerSupply/RP8300/RP8300%20Redundant%20Power%20Supply%20Installation%20Sheet.htm (177 words)

	LRP Power Supply (Site not responding. Last check: 2007-11-07)
		Thanks to the use of state-of-the-art electronic components and intelligent circuitry, the LRP Power Supply is so small in size (5 x 5 7/8 x 1 3/4") and weight (1.94 lb.
		The power supply can be turned on and off with the switch on the back of the unit.
		Therefore, it is not necessary to unplug the power supply to switch off.
	www.rc10.com /shusting/CatalogHub/lrp/powersupply_lrp.htm (151 words)

	OPUS SOLUTIONS - INDUSTRY LEADER IN AUTOMOTIVE COMPUTING - DC-DC ATX ITX POWER SUPPLY CARPC CARPUTER 12V/24V
		The Power-ON lead is monitored to start the PC when the power is turned on and to implement a safe shutdown procedure.
		The power supply can be programmed to shut down the PC after a delay of up to one hour.
		The power supply outputs are monitored to assure proper PC operation.
	www.opussolutions.com /index.php?p=product&id=25 (346 words)

	PC Power Supply
		If used as a power source for the micro and sub-micro servos, you must be careful not to drive the servo to either endpoint to avoid stripping the smaller gears in these units.
		Power supplies in today's computers are known as SWITCHMODE or Switching Mode power supplies and require a load to continue to operate after being switched on (the term switching mode actually applies to the technique of A/C to D/C conversion and not to the power up action).
		The wires remaining in the power supply should be left long and cut to length as needed.
	web2.murraystate.edu /andy.batts/ps/powersupply.htm (1862 words)

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