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Reed switches were invented by Bell Telephone Laboratories. It is an electrical switch that operates with the help of applied magnetic field. It is composed of ferrous metal reeds that are hermetically sealed in a glass envelope. One of the most common applications of reed switch is in the burglar alarm.

How Does A Reed Switch Work

The metal reeds come together under the influence of magnetic field that is created with the help of permanent magnetic or an electromagnet, thus the electrical circuit is completed. When the circuit is open the magnetic field ceases so the metal reeds separate and in this condition the switch is considered to be open.

Configuration Of Reed Switches

Silver, ferrous, gold & mercury are the widely used metals. Sensitivity is an important quality of the red switches. It is measured in Ampere-turns that is the number of amperes of electricity flowing in the coil multiplied by the number or total turns of the coil. Thus smaller the size of reed switch, the more sensitive it is. In other words the size & sensitivity of reed switches are inversely proportional. The glass used in the reed switch must be free from volatile components like lead oxides & fluorides. It must also possess a high electrical resistance.

Uses Of Reed Switches

In the past century somewhere in 1970, telephone exchanges used millions of reed relays particularly by the British community. When the operating currents are low, reed relays provide a high speed; good perform ace & long life.

The most common use of reed switches is in sensors & alarms. When the lid of the modern laptops is closed, the system is put on sleep or hibernation mode with the help of these reed switches. The door & window sensors in burglar alarms make use of reed switches. In the automobile industry they are used to sense the temperature & rate of flow of coolant.

The dentist’s drill also has reed switches to check the pressure of the drill. The liquid in dishwashers & washing machines is dispensed with the help of reed switches.

In spite of the cutting edge technology, there are limitations of the reed switches as well. Cracking & chipping is common owing to the small size & glass casing. When the contacts are soldered or welded on circuit board, the contacts being fragile are often damaged. Reed switches are in great demand in the robotics & automation industry.

 

Over the years, creators of viruses have become smarter with not only what they attack but how they attack. From secretly hiding in your registry to showing up as a simple executable file that you think is harmless. There are many situations where you think you are covered and are protected with the latest anti-virus software until the hackers find a different way to compromise your data and sneak viruses onto your computers.

A new social-engineering scam is currently targeting PCs and targeting them worldwide. However, what makes this different is the fact that is doesn’t use a computer to give you the virus but it all starts with a phone call that could seem legitimate such as Microsoft. What then happens is the victim is told by the person on the phone for the primary computer in the household and information on it. After giving away this information, the company on the other land tells the individual that there home computer is infected with a virus and offers steps to correct the issue. After being willing to resolve the issue, the victim helplessly clicks a link in order to give the Microsoft Tech remote control of the PC thus installing a virus onto their PC.

Many legitimate companies which use remote software are offering warnings to consumers to be aware of this scam. Along with the warning, they made available sample scripts that the scammers would use in order to trick the consumer into downloading harmful information to their computer. After the company tells you of the virus you have on your PC, they will then offer to correct the issue for a minimal fee by asking for your credit card information over the phone. Many have concerns that once the software is installed, it gives them unlimited access to your files and personal information which is a legitimate concern. Once access is granted, it is impossible to know what they can see and what they can’t.

The most important way to keep yourself from becoming the victim is understand what is legitimate and what is not. If they ask for your credit card over the phone, then normally they are not a legitimate organization, especially if you have never heard of them before.

(picture vga kabel made available by Kabelmaxx)

 

Electronics News October 2011

October 4th, 2011 | Posted by admin in Electronics news - (0 Comments)

Electronics are one of the most popular items among consumers. By getting electronics, people can buy things ranging from smartphones, iPads, iPods, televisions, digital cameras and video game systems. With these items people will have many products that they can enjoy and provide them with entertainment. The electronics products can also give consumers something for practical use and allow them to do certain tasks more easily and efficiently. Like many other products electronics are always evolving and improving so there are always upgrades and new products being made. Among the newest products are the latest versions of the iPad and the iPhone.

The iPad was first introduced a few years ago and now has the latest model known as the iPad 3. The iPad 3 is the newest model of the now highly sought after tablets. The tablets allow people to do just about anything. These activities include accessing the internet, sending emails, watching videos, listening to music and playing games. The tablets also give you the opportunity to read books and other literature. With the iPad 3 you will get a handheld portable computer. Another one of the newest electronics products is a tablet that is offered through bookstore chains and retail sites. These tablets are like the iPad but they specialize in providing people with the ability to read books and magazines. With tablets such as the Nook and the Kindle people will have a variety of accessing reading materials without having to pay for books and other hardcopies of literature.

Another one of the most popular products in electronics is the iPhone. This is a smartphone and an advanced cell phone. With the iPhone consumers can make calls, send text messages, send emails and access the internet. They can also watch videos, listen to music and read content.