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Computer Hardware Information
Review of Popular Wireless Headphones
Just about everyone would I agree, I think, that wires on headphones are just about the most annoying wires associated with any electronic device. When you listen to music you don't want to have to stay in anyone one place, and you don't want to have to worry about cords tripping you are pulling your headphones down. The answer to this problem is wireless headphones, many of which allow you to listen to music over 100 feet away. They, like all wireless devices, give you a sense of freedom, an ability to move, work, and play wherever you want. You will find here a list of some of the most popular wireless headphone devices, with important information about each.
What is ESR Meter?
All capacitors have a certain amount of resistance to the passage of AC current. ESR (Equivalent Series Resistance) is the sum of all internal resistances of a capacitor measured in Ohms. An ideal capacitor has ZERO ohms ESR. From the diagram below you can see a resistor in serieswith a ?PERFECT CAPACITOR?. The value of the resistor is called ESR. Electrolytic Capacitors have a tendency to increase its ESR overtime due to drying or corrosion. High ESR is a frequent problem in today?s electronic circuit. Even a 1 or 2 ohms rise in ESR can cause complicated problems. Under normal conditions the ESR has a very low value, which stays that way for many years unless the rubber seal is defective, in which case the electrolyte?s water component gradually dries out and the ESR creeps up with time. The increase in ESR increases both voltage drops within the capacitor and the heat, produced in the capacitors due to resistive heating. If you don?t check for ESR, you may be in for a ?TOUGH DOG? repair. High ESR is the first sign of a capacitor failure. High ESR will cause complete circuit failure, over heating of capacitor, loading of the circuit, overstressing of other circuit components and other undesirable effects.
What Is A Fuse? And How To Test It.
A fuse is a very thin wire, which either melts or vaporizes when too much current flows through it. The thin wire may be made of aluminum, tin-coated copper or nickel. The resulting open in the circuit stops current flow. In electronic equipment, most fuses are cylindrical glass or ceramic type with a metal cap at each end! The current rating also can be seen in one of the two metal end caps. There are two popular physical sizes: 1 ? ¼ X ¼ - inch and 5X20mm. The 1 ? ¼ X ¼ - inch size is used in many automobiles. You?ll find both sizes in many electronic equipment, but the smaller 5 X 20mm has become more common. Fuses are available with current ratings from 1/500 Ampere to hundreds of amperes.
Understanding Transistor Data and Replacement
If, for some reason, you can?t get an exact replacement for the transistor that you want to replace, you can refer to one of the transistor substitution guides or book, and try to identify a ?near replacement?. Beware, however. A substitution guide will sometimes list a replacement for your part, even though the two parts are not very similar. The most commonly used transistor substitution guides is the Philips ECG semiconductors Master Replacement Guide. Selecting the right transistor parameters or specifications for the equipment you repair will avoid callbacks from customers. Callbacks or repeated repairs due to wrong transistor substitution will cost you extra money and a waste of time.
What Is A Crystal? And How To Test It
Crystal are use to keep the frequency of the clock from drifting. If the signal from this clock stops, or is weak, or the pulses begin to vary, the electronic equipments might show intermittent faults or might stop altogether. The microprocessor pins that hold the crystal are usually called OSC IN and OSC OUT as shown in Figure 1 and the frequency is marked on the crystal. Typical examples of crystal oscillator frequency are 3.58MHZ, 4MHZ, 8MHZ, 24MHZ etc.
How to Read CRT Tube Part Numbers
All picture tubes, whether monochrome or color type are identified by a specific code consisting of numbers and letters. The codes are different from each other because different tubes have different characteristics.
How to Solve Multiple Paper Loading Problem in HP5L and HP6L Laser Printer
Have you ever encountered before the problem of having multiple paper loading in your HP LaserJet 5L and 6L? Do you know that this is caused by a defective separation pad where it's rubber has worn out.
What is EEPROM ?
EEPROM stands for Electrical Erasable Programmable Read Only Memory and also referred to as E²PROM. As the name suggest, an EEPROM can be both erased and programmed with electrical pulses. Since it can be both electrically written into and electrically erased, the EEPROM can be rapidly programmed and erased in circuit for reprogramming without removing them from the circuit board.
What You Should Know Before You Buy Computer Equipment
You will have many factors to consider when deciding on which computer equipment to buy. The bewildering amount of choices can seem overwhelming. This guide will help you compare computer equipment features, and help you to examine and sift through many of the basic items before you buy a new computer. If it be a desktop PC, laptop, discount/surplus computer, a refurbished computer or a computer accessory, this quick guide will help you to get the most for your money.
Ink Cartridges & Printing - Poor Print Quality Solutions
Why are there faint areas or gaps in my print out?
Digital Camera Prints - Getting the Most for Your Money
Digital cameras have really taken off in popularity in recent years. It's not uncommon anymore to see several people at an event with a digital camera. Here are some things to keep in mind when getting your digital camera prints converted into keepsakes.
How to Read Zener Diode Code
Many technicians are confused on how to really read a zener diode code. There are many types of code number indicated on it's body. The look and shape of a zener diode sometimescan be mistaken to be a normal signal diode. To differentiate it, is by looking at the codenumber on it's body- whether it is a normal diode or zener diode. Thanks to the manufacturerswhere their main boards are printed with the word 'ZD' which referred to zener diode and 'D' means a diode.
Using System Restore to Save Yourself from Formatting Your Hard Drive
It is the most annoying thing when one day you use your computer and nothing seems to work fine. Program freezes, files get corrupted or internet doesn?t work. You called the customer support or some friends you know who?s very much familiar with computer and still didn?t solve the problem.
Looking for Information on CD Duplication and Replication?
Time is one of the most important things we have that we are always short on. One way to maximize your time is to have the most up to date technology available. But, this can be costly. If you are in the market to purchase CD duplication or replication products, you won?t have to spend a lot of money to get quality products to help you with this. Depending on what type of CD duplication you are interested in, you will more then likely find just what you need online and do so quickly.
RFID for Beginners
RFID technology is used frequently today and has been around since the 1920s, but not many people know about, or understand it. RFID stands for Radio Frequency Identification and is used to store and retrieve information. This information is stored and retrieved using RFID tags or transponders. RFID tags are small and can be incorporated into many products. The tags have antennas that allow them to receive and respond to radio-frequency queries from an RFID transceiver.
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