DC Power Supplies by Steve Valentino
The electricity that flows in two ways, AC or alternating current and DC or direct current, is actually a movement of electrons along the conductor. The difference of the two lies in the direction, wherein the former keeps the moving electrons in a switching manner, while the latter is in a... The AC system of the power supply is utilized for transmitting long distance power to various power companies. ... DC power supply is already an indispensable and ubiquitous component in our everyday life.

Power Supplies by Steve Valentino
All of the high-tech peripherals and latest editions of computer software products that you’ve installed are useless if your computer’s power supply is not sufficiently providing electricity. Before your computer can operate properly, it needs an adequate amount of electricity. ... The power supply is typically known as the “switching power supply.” This is a metal box found in a corner of the computer case. ... Through the power supply system’s switcher technology, power deliveries the electricity once the alternating current (AC) input from an electrical outlet is converted into direct...

Choosing the right DC Power Supply for your Application by Bob Preville
The DC Power Supply is a rather fundamental electronic device, however there are hundreds of DC Power Supply products on the market from dozen of manufacturers. Narrowing down the best product for your application and budget can be a daunting task. This article addresses DC Power Supply... Switching power supplies are usually larger, noisier and more expensive than their linear counterparts, however, switching power supplies are typically more efficient. ... Realistically, no power supply is 100% efficient because power conversion always results in energy loss, usually in the form of heat...

Four Power System Problems Common in Colocation Facilities by Robert Deupree
The primary factor that determines uptime for servers in a colocation facility is power. Power outages will knock a network offline and even damage hardware such as motherboards, memory, and hard drives. Despite how intrinsic power is to keeping businesses connected to their networks, only 2% to... Problem 1: Non-redundant Power Grids Multiple PDUs connected to separate power grids and multiple UPSs should be designed into the colocation facility to offset a power grid failure. ... Every part of the power system – uninterruptible power supplies (UPS), transfer switches or circuit...

How to Install a Desktop Power Supply by Gary Hendricks
In this article we discuss how to install a desktop power supply. In learning how to install computer components, this is one of the easier tasks—yet also one of the most dangerous. The power supply delivers juice to your desktop, so follow the safety precautions below before you start. ... First, plug the cord back into the power supply and flip the power supply switch back on. ... Align and Secure the Power Supply The next step in learning how to install a desktop power supply is to align it with the case and then secure it properly.

The Importance Of Current Sense Resistor In Switch Mode Power Supply by Jestine Yong
Current sense resistor is usually located in the switch mode power supply section. Newer version of monitor-the b+ (boost) circuit also have this current sense resistor. If you repair electronic equipment especially the switch mode power supplies, the current sensing resistor is connected to the... In monitor power supply where pulse width modulation (pwm) ic UC3842 are used. ... In some cases where overload happen-the power section will blow and most of the time the components changed are fuse, power fet, pwm ic, zener diode and current sense resistor.

Computer Memory Problems by Michael Russell
In this article we're going to concentrate on why and how memory goes bad and what causes memory problems. If you've ever worked on a PC and all of a sudden in the middle of blasting the heck out of some space invader your PC goes black and then suddenly reboots look no further than some kind of... If you have a defective power supply, or one that is just plain cheap, what happens is your power supply may fail to filter out the noise that can mess up your computer system. ... A PC uses a switching power supply to convert 120Vac to the voltages that are required by your PC.

The Right Way To Discharge Capacitor In Switch Mode Power Supplies by Jestine Yong
Switch mode power supply contain some large filter capacitors that can hold dangerous charges even if the unit has not been used for several days. Typical values of this type of filter capacitor are 220uf 250volt and 330uf 400volt! If you are going to work on the power supply circuits, it's a... There are three ways to discharge the big filter capacitor in a power supply. ... I once blowed the power section using this method. ... I use a 2.2k ohm 10 watt resistor to discharge the high voltage capacitor in a switch mode power supplies.

ATX Power Supply Repair And Troubleshooting by Jestine Yong
Customer ATX power supply came in with the complaint of intermittent no power. When testing it with power on, I could see that the fan is not rotating. Not only that, some filter capacitors also became bulge because of the heat accumulated inside the power supply. ... If you switch off a working power supply and power removed, touch the power transformer, you could feel it is quite warm. ... After replacing the capacitors, removed the decayed glue and service the fan, the Atx power supply again given a new life to faithfully serve the computer.

Samsung 153V LCD Monitor Power Supply Repair Tips by Jestine Yong
Troubleshooting Samsung 153V LCD power supply is just like troubleshooting those crt type. This monitor came in with no power symptom. If you are first time repairing this type of power supply, I recommend you to first remove the switch mode power transformer. ... After carefully checking all the components in the power supply section, I found the filter capacitor do not have any reading using digital capacitance meter (open) , the two round type fuse also open circuit, 1N4744 15 Volt zener diode short circuit and lastly the power ic TOP247F blown!