File Name: difference between at and atx power supply .zip
Objectives: This chapter introduces the student to computer case, motherboard, and power concepts.
Objectives: This chapter introduces the student to computer case, motherboard, and power concepts. The objectives important to this chapter are: Form factors: computer cases, motherboads, and power supplies How electricity is measured How a computer system can be protected from damaging changes in electrical power About Energy Star How to detect and correct power supply problems Concepts : The chapter begins with a discussion of form factors for cases, power supplies, and motherboards.
A form factor is defined as a size , shape , and set of features. The author observes that, when building a computer, you should pick a form factor for the motherboard first, which will limit or determine your choices for the case and the power supply.
Consider these basic requirements: the motherboard must be small enough to fit in the case, and the holes in it must match the attachment points in the case the ports jacks on the motherboard must match holes in the case the power supply must fit in the case, and must have power cords that fit the motherboard and provide the correct amount of power Seven types of system board designs are listed: AT, Baby AT, ATX, BTX, LPX, NLX, and Backplane.
Each has variations. They have two main connectors for power: P8 and P9. AT boards are larger than the other styles listed here. It may be recognized by its size, and the placement of the processor in front of the expansion bus slots, which puts it in the way of longer cards.
AT power supplies blow air into the system. The board is 13 inches by 8. The processor is still in the way of the expansion slots.
A problem with this design is that devices mounted in the case often have to string cables all the way across the motherboard to connect to it. ATX system boards have one main connector for power: P1. The originals had 20 pins, but later models have In between, there were models that had a separate 12 volt connector just for the processor.
This was incorporated intothe 24 pin design. The processor on an ATX board is beside the expansion slots, not in front of them. Newer models of processors typically use less power. ATX power supplies blow air out of the system. ATX boards have a soft switch. Operating systems such as Windows 98, , and XP can turn the power off when shutting down.
BTX system boards have one main connector for power, a 24 pin P1. BTX power supplied blow air out of the system. A BTX box's main characteristic that that all components are oriented to have air passing directly over them. NLX system boards have only one expansion slot. It is used for a riser card, which may contain other expansion slots, and connectors for floppy or hard drives.
NLX boards will have video circuits included on the board. LPX boards are low end boards, unsuited for newer processors due to heat and size. LPX boards are frequently changed by a manufacturer to make them proprietary.
This means that parts can only be obtained from that manufacturer. Backplane Systems A backplane is not a motherboard. It typically only holds expansion slots, one of which will be used for a mothercard. Active backplanes have some slots , buffers , and driver circuits.
Passive backplanes have no circuits , just a slot for the mothercard. These systems are not for personal computers, but are used in rack systems. Three varieties of case types are listed: Desktop - typically have four drive bays, about six expansion slots, and were meant to sit horizontally on a desk.
The text puts compact cases low profile cases in this category. They are typically smaller, and meant for low cost, less powerful computers.
Tower - typically sits vertically on a desk or on the floor bad idea: static from the carpet. These come in a variety of sizes, the larger ones generally for more powerful computers and servers. These vary in thickness and weight, number of slots and ports, and processor power. The size of the case may require that the power supply be external, and in some cases that peripheral devices are external as well.
The chapter continues with a discussion of how electricity works. It introduces some basic electrical terms that are used in the text such as: volt - a measure of the difference in electrical potential between two points. For instance, in order to feel a discharge of static electricity, there must be a difference of or more volts between you and some object. Abbreviation: V ampere - a measure of electrical current. Also called an amp , it is a measure of how much electricity is flowing through a system.
Amps are given by the formula volts divided by ohms. Abbreviation: A ohm - a unit of electrical resistance. Wires are rated as by their electrical resistance. For instance, coaxial cable used in networking is usually required to be 50 ohm cable. Power supplies are rated as being able to supply a certain number of watts. Abbreviation: W Your text uses these terms in a general way.
For more details on electrical terms, see Marshall Brain's response to a question about electricity. While we are at it, Mr. Brain's article on Computer Power Supplies is quite good, too. The text explains that Alternating Current AC travels one way through a circuit, then changes to flowing the other way.
In the United States, this oscillation takes place about 60 times per second. Direct Current DC does not oscillate. Power supplies are meant to produce direct current DC power for most components. Since they are meant to be plugged into a source of alternating current AC , the power supply must include one or more rectifiers which are AC to DC converters. Voltages and other standards vary from country to country. The text explains some common electrical standards for wiring, relating to the color of the insulation on the wire.
These standards may vary. Black wires are often used for hot power from source in and volt circuits. White wires are often used for neutral return to source in and volt circuits.
Red wires are often used as the second hot line in volt circuits. Inside computers, red wires are often used as the only hot line. The text offers more terminology.
You should be aware of the meaning of the following terms: conductor - a material that electricity flows through easily, like copper wire insulator - a material that resists the flow of electricity, like plastic or rubber semiconductor - a material that conducts electricity under certain conditions, such as under certain voltages or certain currents.
Made of three layers of different kinds of semiconductors. It is meant to serve as a buffer for circuits that need an even flow of current. Diodes are used to construct a rectifier, which converts AC to DC. The text offers a list of safety advice about working on computer. Some items in the list are to keep you from damaging the equipment, some to keep you from damaging yourself. Every day I am amazed by another professional who did not make any notes about what he did, and who cannot undo a mistake or tell anyone what troubleshooting steps he has tried.
Cellophane, packing tape, plastic foam, and other items hold static electricity. Remove them from your work area as soon as you open the packages that they come in. Keep components away from hair and clothing.
Hair and clothing can carry electric charge, can snag on equipment and cause malfunctions, and worst case, can pull you into contact with hot, sharp, or crushing devices. Keep screws, spacers, and small parts where you can find them. The book suggests a tray, or other container. An empty egg carton can work, if you can find the paper kind. No plastic foam around the work area, remember? Do not stack boards, cards, or other devices , because you can break pieces off when you move them.
Regarding cards and motherboards: do not touch the chips or the solder points. Hold them by the edges. The main thing is avoiding static discharge from you to the component. Do not touch chips with magnetic tools. In general, do not work on computers with magnetic tools. Do not use graphite pencils to change DIP switches. Graphite conducts electricity, and it can break or rub off in the switch. If you need something to perform this task, the orangewood sticks sold in any cosmetics department are ideal.
They are strong, hold a point, and they do not conduct electricity. In a classroom, have your work checked by your instructor before closing the case or applying power. This translates to having a partner check in the real world. In class, it is much easier to get credit for the lab this way. Hint, hint.
Hardware Support contains troubleshooting and information about all types of computer hardware peripherals. A bit of research into the specific features of your motherboard can help you decide what to buy, and it can protect your computer from damage from hardware which is not compatible with your motherboard. The most common styles of motherboard are the AT form factor motherboard, along with its next-generation form factor cousin, ATX. Features AT stands for "Advanced Technology. Form factor is not just a term for motherboards. Size and Orientation The ATX form factor's positioning was redesigned to offer better access to the peripheral components on the inside of the computer.
Asked by Wiki User. This is the main difference. The main difference from the main ATX form factor is size.
AT vs ATX The motherboard is an integral part in a computer since it is where all the components are attached to. AT is a very old standard that was created by IBM for their own computers. ATX was developed by Intel to address some of the shortcoming of the AT standard that makes it unsuitable for the varied demands of personal computing.
Current limiting a ATX Power supply if I want variable voltage design So I was trying to convert an W ATX Power supply to a bench supply, I figured since the supply is rated for upto 20A on various voltage lines, I could potentially use the fixed voltages as high current sources. Firstly, a power supply will not work if you simply plug it in and flick the switch. Categorized catalog, free delivery and wide selection.
ATX Advanced Technology eXtended is a motherboard and power supply configuration specification developed by Intel in to improve on previous de facto standards like the AT design. It was the first major change in desktop computer enclosure , motherboard and power supply design in many years, improving standardization and interchangeability of parts. ATX is the most common motherboard design. The ATX specifications were released by Intel in and have been revised numerous times since. The most recent ATX motherboard specification is version 2.
The power from a wall outlet is high-voltage AC. The type of power computers need is low-voltage DC. All computer parts the electronic chips on the motherboard and adapters, the electronics on the drives, and the motors in the hard drive and optical drive need DC power to operate. Power supplies in general come in two types: linear and switching. Computers use switching power supplies.
The power switch of AT style power supplies is integrated directly into the power supply itself. This is a physical switch that turns the power supply on and off. ATX style power supplies use a "soft switch" that is controlled by the motherboard.
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AT and ATX stand for Advanced Technology power supply and Advanced Technology Extended power supply. Both are types of Switch Mode.Susanne K. 05.06.2021 at 04:48
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Modern personal computers universally use switched-mode power supplies.