Are you searching the most recent technology air conditioning? Air Conditioners are among the most salutary discovery among different devices. You get peace & solace during the warm summer days & hold on you outside from the crushing heat. All the same, discovering to it's functionality people are purchasing in spite of high costs. 

Air conditioners have at present turn a requirement for every on of us. With the dominating wet climate in state like ours, an air conditioning is an essential thing. Air conditioning fundamentally functions to reduce the room temperature and move out or de humidify the moist from the room. Also they strain exterior air giving supplying us good air to breath.

Let's find out the sorts of air conditioners for sale for different functions:

Mobile air conditioning, movable Air Conditioners: are commonest type of airconditioners. This air conditioners are employed for numerous applications such manufactures, storage warehouse, & impermanent concerns wherever normal air conditioner isn't workable. In point of fact window air conditioning are also in extensive use this days. They're utilized mainly in homes & small authorities. Movable air conditioners are practiced in such a site where permanent installing isn't wanted.

Windowpane Air Conditioners: windowpane Air Conditioners are small equipments that are established on a classical windowpane space. This conditioners come out different BTU (British Thermal Units) capabilities to cool off rooms of dissimilar sizes. Among the fine characteristic of windowpane Air Conditioners are they doesn't demand space in room & become easily installed on window.

Split air conditioning: A split air conditioning gets into 2 divisions, one building block is established inside the room (evaporator building block) where cooling system is demanded & the extra building block is held external (ventilator or condenser package). The best matter about Split ACs is that it functions quiet different than the windowpane ACs. But they're noisy because outside surroundings because of the condenser package installed outdoor.

Wall mounted up Air Conditioners: Wall affixed air conditioning installing charge is unaffordable. This are permanently installed or fastened air conditioners & are appropriate for big suite.

Central air conditioner arrangements: The Central air conditioner schemes are applied in authorities, manufactures, shopping center, big outlets, manufacturing plant, restaurants, gymnasiums, movie house hall, and so on. It goes as air conditioner the total hall at one time.

But care should be taken while selecting an AC because some of them can consume large amount of electricity. So be aware and choose the right one according to your needs.

We are all familiar with mobile phones and it has become an integral part of our life. What is the working principle or what is the major control element of a mobile phone? From a simple watch circuit to a high frame computer, it uses the same principle or idea of construction. They are all powered by a microprocessor or a controller. Microprocessor and controller have become an integral part of almost all the electronic goods that we are using now because of its easy implementation. In the past after the invention of transistor if we have to design a circuit for solving a problem like measuring temperature it was very tedious. This was because implementing this logic requires some difficult calculations and again converting this logic into circuit is harder than the logic derivation. Let the circuit be implemented after this entire hard works, then what will be the situation, the size of the circuit will be of size of a large room. To reduce the size integrated circuits were began to use. This helped to reduce the size to an extent. But the difficulty in designing circuit and implementing it remained the same. This time in 1930 or 40s it became essential to develop a control circuit for the space exploration of Apollo and it has led to the invention of microprocessors. The circuit designed for the Apollo was similar to a computer which contains a main control unit, memory, power supply unit etc. Later microprocessors were replaced by microcontrollers. A unit consisting of a controller and the associated parts for its working can be called embedded system. Embedded systems have become popular after its invention and have changed the electronics field a lot. A circuit which is designed to do a specific task or for a series of tasks can be called embedded systems. In modern electronic industry it is the factor behind every electronic product. A microprocessor or controller can be programmed to implement a function. Thus the tedious task of circuit designing has paved way to programming. This helped to bring down the effort a lot. This is the key factor that has replaced the ordinary transistor and IC circuits. As Early said embedded system is consisting of a processor or a controller. There will be some associated components required for the working of controller. The main part of the circuit will be the controller or processor. The controller architecture consists of processing unit, memory unit, registers, input/output ports, timer or counter. These parts are integrated in the single chip. Processing unit will be carrying out mathematical and logical calculations. The results of these calculations were stored in the registers. Input and output unit helps to exchange data between the controller and the user. The whole activities of the controller are synchronized by the timer frequency. The normal frequency of controller is around 20 MHz With this interval of milli second is required for the completion of a process. One of the advantages of microcontroller based system is that it can integrate both mechanical and moving parts in the circuit. Examples of circuits which uses controller are digital watches, MP3 players, mobiles, computers, digital cameras, DVD players, washing machines and even microwave ovens. Also some industrial machines dedicated for a particular task can also be designed using microcontrollers. Microcontrollers can be programmed in high level and low level. High level language can be written with the help of languages like C, C++ etc. But low level programming is a bit difficult task. It is written in machine language. So in order to write low level language one should study the pneumonic of the microcontroller instructions. These written programs determine the functions associated with a controller. Larger the functions to implement larger will be the program. The assembly program of the controller is stored within the Rom of the controller. When microcontroller is powered the program in the Rom is loaded and functions can be implemented. Data which is to be processed is stored on the Ram and registers. Manipulations can be done on this data and results can be obtained from the processing unit. Data present in Ram will be available only if there is power. So for future use data present in Ram is to be moved to secondary storage devices like hard disk or CD. Microcontrollers not only helped in reducing the task for designing a circuit but also it helped to reduce the size of devices like mobile phones and MP3 players. In future we can hope that microcontrollers will rule the electronic industry.

Our oil mines and energy resources are depleting. It takes about thousands of years for the production of coal and mines. Time to choose renewable energy sources for all our activities will not be so far. The major source of renewable energy is the solar power. What makes it more convenient is because of its greater availability in the day time and the supply will be almost constant throughout the day. Also tapping solar power is simpler than any other resources. PDevices used for solar energy tapping are solar panels. You can see it in your watch and calculators. Those small cells have capacity to produce some mill volts of energy. But when we move onto large scale production the area of the cell will be more. Solar cells are called photovoltaic cells. It got this name because when photon or light of suitable energy falls on it, it produces voltage. Large solar panels are made by arranging small cells in a series manner. Solar cell is constructed from semiconductor materials. These materials will emit electrons when light of suitable energy falls on it. This electrons flow between terminals and thus voltage is developed between the terminals of the cell. Silicon is the common material used for constructing solar cell. The outer electrons present in silicon can be easily removed by hitting a photon. Earlier solar cells were found application only in satellites. But today we are using it in solar powered heaters, street lamps, watches and calculators. Now some vehicles are using solar power to charge the batteries and use that power to drive that vehicle. But the limitations of solar cell make it less efficient when compared to fuel powered vehicles. In future this situation will change and we all will be adopting solar cells for our power generation activities. The difficulty in implementing solar panel is the availability of the panel and also the cost for initial setup is high. But to provide solar cells at a minimum cost and making it more popular is the only way to overcome this energy crisis. In some developed countries they are changing their houses self powered by the solar cells. In future this will spread into more nations and will reach India also.

World is moving through various technological advancements and man is pacing with them all. An easiest example is the telecommunication field. From ancient days men used different methods for telecommunication and now we are in the era of mobile technology and internet. The mobile phone which came to catch moving man became all purpose devices in recent days.

Here I am going to explain about the new technology 3G or Third Generation Technology. Till now ,we are familiar with 2G technology which enables us voice communication over air, internet connectivity with EDGE or GPRS connectivity options that provide speed up to maximum of around 65 KB/s. 2G technology is not so much advanced because of  its  limited bandwidth and transfer rate. But 3G technology when compared with 2G have some advantages. In terms of speed 3G technology is offering a speed of 3MB/s.

3G technology represents a shift from voice oriented communication to multimedia oriented communication and services. Demand for voice services has become the requirement of past days and now it has changed to data or multimedia requirements.

COMPARISON OF 2G AND 3G TECHNOLOGIES

2G TECHNOLOGY

2G technology is based on low band data signaling. One of the popular 2G technology is the GSM-Global Systems for Mobile Communications. It's first implemented in 1991 and using in about 140 countries and around 248 million users around the globe are using it.

Now what's GSM?  It's a combination of Frequency Division Multiple Access (FDMA) and Time Division Multiple Access (TDMA).GSM uses a frequency of 25 MHz of bandwidth with spectrum of 900 MHz FDMA is used to divide the available 25 MHz bandwidth into 124 carriers with 200 kHz frequency. It is then again divided using TDMA into 8 time slots. But later frequency band width of 1.5 GHz is implemented in GSM to increase data capability.

In addition to GSM another technology called Personal Digital Communication (PDC) emerged in Japan.  Also the CDMA technology which emerged in North America and it implemented a system called spectrum technology which breaks the speech into small digitized segments and encode to recognize call. 2G technology has some data handling capacity such as fax and sort message service with a speed of 9.6 kB/s. But it's not suitable for data applications like web browsing and multimedia applications.

In order to overcome this drawback new methods like high speed circuit switched data (HSCSD),General packet radio service (GPRS), Enhanced Data Rates for Global Evolution (EDGE) technologies where evolved. It improved data speed up to 57.6 KB/s. This data speed is achieved by 14.4 kB/s data coding and aggregating of four radio channels with time slots of 14.4 kB/s. But all these developments become unsatisfactory because of low bandwidth and speed.HSCSD is the previous step towards the 3G technology.

3G TECHNOLOGY

The 3G technology can be defined as the convergence of existing technologies in 2G. Both terrestrial and satellite components are included in 3G.An important advantage of 3G is that we can integrate existing technologies of 2G such as CD MA,GSM,TDMA into 3G.

This technology uses a Core network and Radio Access Network (RAN).Core network is consisted of packet switching module which includes 3G, SGSNs and GGSNs which has same function as that of GPRS. The circuit switched domain contains 3G MSC for switching of voice calls. Also the access and charge of the services are done through the core network. RAN is entirely different from core network according to its function.

RAN consist of elements like Node B and Radio Network Controllers (RNCs).Node B is equivalent to the base transceiver station in 2G network and RNC is the Base Station Controller in 2G network. It functions as radio source management and helps in switching between circuit switched and packet switched domains. The connection between elements in RAN and between RAN is made possible with the help of lub, lur and lu interfaces. The lu interface is split into circuit switched d and packet switched. The lu interface is based on ATM. Also voice is embedded on virtual networks using AAL2 technology. These switching between 3G SGSNs for data and 3G MSC for voice are made according to the requirement.