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.

Uninterruptible Power Supplies by Steve Valentino
The loss of electricity supply is technically called as power outage. It is specifically referred to as “brownout” when some power is lost but retained some voltage level, albeit not enough for the minimum level required by a certain system. On the other hand, it is called “blackout” when the... It is a battery-driven power supply that is active even whenever sudden loss of power has occurred. ... Fortunately though, there is a device that counters the situation in the form of Uninterruptible Power Supply or UPS.

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... Realistically, no power supply is 100% efficient because power conversion always results in energy loss, usually in the form of heat dissipation. ... Choosing the right DC power supply for your application requires definition of some basic design specifications: voltage range, current range, number of...

UPS Power Supplies To Protect Your Computer by Alan LeStourgeon
Many people do not realize the absolute importance of purchasing a UPS power supply for their system. UPS stands for Uninterruptible Power Supply, but it is not uncommon to hear people refer to them as UPS power supplies, despite the redundancy. It can also be confusing to newcomers because... An uninterruptible power supply works by filtering the electrical power coming from electric company while storing a small amount in a battery. ... By attaching your UPS to your computer via a standard USB cable, your computer will give you reports of activity on the power supply.

The Importance of Your Computer Power Supply by Alan LeStourgeon
Inside your computer is a component that is the lifeblood of your hardware system. It is responsible for your motherboard, your hard drives, your CD and DVD drives, and a half-dozen other possible components. For many people, the only part they see of this important component - the power supply... Finding out how many watts a power supply can generate is the first way to determine if your computer system is risking being underpowered. ... A power supply is measured primarily in terms of watts. ... But don't buy a power supply that far exceeds your realistic expectations; you'll just be...

Laptop and Notebook Computer AC Power Adapters by Stella Blue
An AC Power Adapter is an electronic device which produces a specific direct current from the mains with an Alternating Current (AC) . Although actually a power supply it is popularly known as an AC Power Adapter or AC Adapter. Laptops along with most other portable devices use Direct Current... Universal Laptop Power Adapters Complying with most mains power supplies worldwide, a universal power adapter or power supply is able to accept an input voltage ranging from 100 - 240 V with a frequency range of 50 - 60Hz.

Understanding TOP223P And PQ05RD11 IC In Thompson DVD Power Supply by Jestine Yong
The TOP223P pulse width modulation ic is designed to work in switch mode power supply (smps). It is mainly used in the audio/video electronic equipment. Computer monitor rarely use this type of ic. In this article, I would like to share with you that not all switch mode power transformer must... Conclusion-Troubleshooting power supply that used the TOP223P ic or other family type is very easy if you understand how power supply work and if you have the schematic diagram of a particular equipment.

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!

JVC VCR Problems In Model HR-J321EM-No Power by Jestine Yong
A customer sent me a JVC HR-J312EM model VCR for repair. The complaint was no power. I personally don’t repair VCR because I’m more on computer monitor repair. Because of he is a friend of mine; I told him that I’m willing to take the challenge to repair it. ... However, certain electronic equipment power supply designed, the capacitor may still hold charge even the start up resistors seems to be working. ... Conclusion, whether you are repairing the JVC HR-J312EM model VCR or any kind of electronic equipment, if you came across the main filter capacitor still holding the charge even with...

Power Surges - Disaster Caused And How To Avoid It by Dicky Satrio Sudiro
Power surge are one of the most feared incident on electronic devices. Same as computer, they are really susceptible to power surges. Even though surges usually last only milliseconds (and are somewhat filtered by the transformer in the power supply), that high voltage can exceed the withstand... The internal transformers on power supply that do this, the capacitors to bridge over dips in the line power, all these are rated to handle a certain amount of energy at any given time. ... To prevent it you need a good UPS (Uninterruptible Power Supply) to protect your computer and another...