ComputerHunter.org |
|
|
|||
|
 |
Five Band Resistor Color Code-What Does The Last Band Of White Color Represent?
In electronic repair, most of the time i came across five band resistor color code. The purpose of using the five colour band resistor in a circuit is that it provide a more accurate value compare to the four color band. For example in order to get the value of 22.6kohm, with four colors band resistor you will not be able to find it. The most you can get is 22k (red,red,orange and gold). If with the five color band you will be able to calculate it (red, red, blue, red, brown)the last color which is brown represent 1% tolerance. You may go to google search engine and type resistor color code, resistor color coding, resistor color code calculator, or resistor color code chart to know more about how to calculate a five band resistor values. If you open up an analog multimeter you will understand what i mean. Most of the resistor circuit inside the multimeter are using five color band. Why? Because the reading that you get whenever you measure current, voltage or ohm, the panel will show the nearest value. For instance, if you measure a 9v battery the needle will point to may be 8.9v,9v,or 9.1 volt. If that particular multimeter was designed using four color band resistor the result that it gets may be 8.5v,9.5v or even 10 volt. In other words the use of five color band resistor is to make a circuit more precise and output the desire result as what the engineers want it to be. There's a interesting five color band resistor which is unique. In fact i have already seen quite a number of them. I will reveal the calculation about this unique five color band resistor. The colors are orange, orange, red, gold, white. Actually it is a four color band resistor. Just ignore the white color and proceed to calculate using the four color band formula. As to why the resistor manufacturers add this 'extra' white band i really do not know. However, from forum someone said that it is for the military purposes. If you know the answer i would like you to email me so that i can share with other fellow electronic repairer thru this info repairing newsletter. Jestine Yong is a electronic repairer and a writer. For more information on electronic repair please visit his website at http://www.noahtec.com/electronic-repair-articles.htm
Google News - Top Stories
|
|
|
|
RELATED ARTICLES
Flash Memory Part 2: MMC and SD MMC and SD Used Laptop Computer: Your Quick Purchase Inspection Guide ? Part 2 Used laptop computers are everywhere these days. How can you sift through the mass of available used laptop computers to narrow your search down to the right laptop for you? This is the second part of a series of articles designed to give you a few suggestions for your next purchase. What is Over-clocking a Processor? Q : What is over clocking? Nvidia Geforce 7800 GTX Review Nvidia has done it again, with it's newest video card, the geforce 7800 GTX. If money is no object and you demand the best, this is the video card for you. DVD ROMs DVD CD ROMs have become predominantly the most used CD drive for desktop and notebook computers. They are very reliable and now come as a standard in most computers. If you are looking for a laptop then make sure it has a DVD ROM, this will give you extra speed for normal Cds, and you will be able to watch your favourite DVDs while you travel. Recordable DVD Formats Explained Picking your way through the ton of information available on recordable DVD formats can be a nightmare. To help you out, we've done our best to distill it into this summary. Top Three Factors to Consider While Choosing a Data Center for Your Business Data Centers are the core of the Internet. The computer servers that power the Interne,t call Data Centers their home. If you think of how many billions of online transactions that happen every day you will be amazed to know that the final resting place of all these stored transactions is the Data centers. This Amazement quickly turns into Panic when you think about how much private data and vital data is stored there. Over years the Data Center technologies have evolved a lot into much advanced techniques like server virtualization and high speed power houses. There are more than 100 factors one should evaluate a data center against before choosing one to home their servers. In this article we will see the three main that in turn dictate the rest of the factors. Expansion Cards Part 3: PCI Express In the first two installments of this series of Tech Tips, we took a look at PCI and AGP, undoubtedly the most common expansion slots in a computer today. With a few key improvements over both of these, PCI Express is destined to replace both and offer a whole new level of computer performance. Would You Like An Extended Warranty With That? Should you buy an extended warranty with your laptop? You may not want to think about it now, but sooner or later, something is going to break down on your laptop. When it happens, the big question will be who gets stuck with the bill, you or the manufacturer. Types Of Laptop Batteries Throughout the years there have been many technologies involved with notebooks, and laptop batteries are no different. There are actually three distinct notebook battery types on the market today. Knowing the difference between them will help you decide on exactly what to get when the time comes for a purchase. Trouble-shooting Hard Drive Problems - Part 1 It is extremely important not to make or write any changes to data on the hard drive without first verifying the hard drive configuration. Therefore, the first priority when unable to access information on a hard drive is to verify all of the configuration information dealing with the suspect hard drive. Facing DVD Software Dilemma? Its Brainlessly Simple 1. Pocket DVD Wizard http://www.deprice.com/pocketdvdwizard.htm How To Purchase A Quality Laptop Computers Case So you finally have that new laptop you have been drooling over for the past 3 months, only there is one problem ?- You don't have a case for it. You've probably already laid down over a grand for the notebook and you're telling yourself that you don't want to spend another $70 for a case. Trust me, this isn't the time to be cheap. Pixel Disruption To Cause Nausea From User of Computer Screen As we study the issues associated with teaching kids in the classroom we find that fluorescent lighting can plague the learning abilities. A slight flicker from such a light can cause disruption in normal brain patterns. Flickering lights at discos and in psychotherapy are used for proper mood enhancement. At a disco it can loosen up a dancer and put the mind in a certain transient state allowing for the movements, mood and mind to flow in the desired pattern. For psychotherapy it can be used to put a subject in a theta state of mind to remember old memories through hypnotic states, relax a patient or even change behavior through the art of suggestion permanently by putting certain commands into the subconscious. 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. Power and Your PC The power coming into a computer is the most critical component, and it may be one of the most overlooked. It is just taken for granted that it will always be there and working properly. A top of the line processor and ultra powerful video card do nothing if a system does not receive the ample, stable power it demands. Having quality components providing and regulating the power supplied to a computer is critical, and this brief overview looks at a few areas worth consideration. Alternatives to Tape Backup You may ask, isn't tape an anachronism in the age of optical disks, removable hard drives and a plethora of whiz-bang, random-access storage media? In many ways it is, but because of the nature of backup it doesn't really matter that tape is slow and sequential-access. Remember, tape is cheap. Businesses use tape because they find it to be a cost-effective backup solution. TiVo: An Introduction for the Few Who Dont Know Yet TiVo will change your life... for the better. Plain and simple: record shows by telling TiVo to record them (not when, what channel, how long, etc.), record all new episodes of X, record all movies w/ so-and-so in them, etc. Do You Have Dead Pixels? Take a good look at your notebook computer screen. Do you find some tiny dark spots? You could have dead pixels. One of the most expensive parts of your notebook computer is the LCD screen. 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 manufacturers where their main boards are printed with the word 'ZD' which referred to zener diode and 'D' means a diode.
|
|
|
|
|
