Circuit, Components, computer, Electronics, Energy, Home, Mobilephone, Techniques, Technology, Television

Computer SMPS How Stuff Works


Switched Mode Power Supply uses a switching regulator to convert electric power efficiently. SMPS transfers electric power from a source ( AC mains) to the load by converting the characteristics of current and voltage. SMPS always provide a well regulated power to the load irrespective of the input variations. SMPS incorporates a Pass transistor that switches very fast typically at 50Hz and 1 MHz between the on and off states to minimize the energy waste. SMPS regulates the output power by varying the on to off time using minimum voltage so that efficiency is very higher compared to the linear power supply.

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Circuit, Components, computer, Electronics, Energy, Home, Mobilephone, Techniques, Technology, Television

Computer SMPS How Stuff Works


Switched Mode Power Supply uses a switching regulator to convert electric power efficiently. SMPS transfers electric power from a source ( AC mains) to the load by converting the characteristics of current and voltage. SMPS always provide a well regulated power to the load irrespective of the input variations. SMPS incorporates a Pass transistor that switches very fast typically at 50Hz and 1 MHz between the on and off states to minimize the energy waste. SMPS regulates the output power by varying the on to off time using minimum voltage so that efficiency is very higher compared to the linear power supply.

Continue reading “Computer SMPS How Stuff Works”

Articles, computer, Electronics, Electronics Theory, How components work, Mobilephone, Techniques, Technology, Television

Wi-Fi System. How Stuff Works


BIRDS

Wi-Fi is the trade mark of the Wi-Fi Alliance and the brand name of products using the IEEE 801.11 family of standards and not the short form of Wireless Fidelity as most of us think. Wi-Fi simply represents the trade mark of IEEE 802.11x. Wi-Fi is the technology that allows an electronic device to transfer data wirelessly using radio waves. It is the WLAN ( Wireless Local Area Network) used in home, office, educational institutions etc to provide wireless networking for the internet access. The common Wi-Fi activated systems like Computer, Mobile phone etc can be connected to the internet wirelessly through the Wi-Fi system. For this, the computer should have a wireless network interface controller called Station. The access point of Wi-Fi- is called Hot spot and may be a wireless Router or Modem. The Wi-Fi usually has a range of 20 meters in indoor applications. The technology of Wi-Fi came into action during 1985.

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3D Glass. How stuff works


Have you seen a 3D Film? It is really interesting and the images appear as seen in normal eyes in a  Three dimensional view. Now 3D films, 3D TV etc are popular and we are on the verge of a 3D boom. Special kind of glasses are provided in movie theaters to watch 3D Films. The 3D imaging or 3D animation uses special technology to record the film and special kinds of glasses are necessary to view the film. If you remove these glasses and watch the same movie with naked eyes, the incredible 3D experience would vanish and you would land up viewing distorted/blurred pictures. The 3D effect is due to an illusion of the depth to the viewer. Let us see the trick behind the 3D technology.

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Remote Tester using TSOP 1738. Sensor Circuit .16


Remote hand sets of TV, VCD player, Home Theater system etc uses Infrared rays pulsating at 38 kHz. So in the receiver section, there is an Infrared receiver to receive the coded IR pulses. In most cases the 38 kHz IR module TSOP 1738 is used as receiver which is specific for 38bkHz IR rays. This module has a PIN photodiode and a pre amplifier stage enclosed in an epoxy case which acts as a filter and passes only IR rays. Its output is active low and gives + 5 V DC in the stand by state. The circuitry inside of the module amplifies the coded pulses from the IR transmitter. From the PIN Photodiode,  the coded signals pass into an Automatic Gain Control (AGC) stage and then into a Band pass filter. Finally a Demodulator demodulates the signals and sends to the output transistor which forms the output. So when the module gets coded signals, the output transistor sinks current.

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Why OLED screen looks brighter than LCD screen? Tech Focus 8


 

New version Mobile phone, Laptop, TV etc uses OLED screen to give brighter screen display. The advantage of the display is that, the screen can be viewed from any angle without glare and the image will be more clear and sharp. OLED (Organic LED) is a 100 – 500 nanometers thick semiconductor film that emits light through Electrophosphorescence. OLED is also called as OELD (Organic Electro Luminescent Device) and made up of thin layers of organic materials that emit Red, Green, Blue and white light. The OLED screen is much thinner than the LCD screen.

The Organic material in the OLED consists of Amorphous and Crystalline molecules without a definite arrangement. These molecules are arranged in different layers. When a potential difference is applied between the anode and cathode of OLED, current flows through the organic layer of OLED. During the flow of current, cathode layer emits electrons to the emissive layer. Anode then gives electrons from the conductive layer creating holes. These electrons combine with the holes in junction between the emissive and conductive layers. When the electrons combine with holes, the energy of electrons is emitted as photons. Colour of the photons depends on the type of the organic material in the emissive layer.Polymer light-emitting diodes (PLED), also Light-Emitting Polymers (LEP), are used in electroluminescent conductive polymer. Typical polymers used in PLED displays include derivatives of Poly(p-phenylene vinylene) and Polyfluorene.

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Why LCD Screen damage easily? Tech Focus 7


 

Liquid Crystal Display is a kind of screen filled with a polarizing fluid between two glass plates. This liquid is an electrically controlled fluid trapped between two transparent polarizing sheets. The polarizing axes of the two sheets are aligned perpendicular to each other. The polarizing liquid is filled in cells which have electrical contacts to permit the entry of electrical field into the cells. When an electric field is applied, the molecules in the liquid align themselves with the field, inhibiting rotation of the polarized light. As the light hits the polarizing sheet perpendicular to the direction of polarization, all the light is absorbed and the cell appears dark.

The whole display has array of segments called Pixels which may be coloured or monochrome or both. The pixels may be divided into Sub pixels of Red, Green, and Blue by additional filters as in the case of LCD TV. These pixels are arranged in front of a light source with a reflector. Each sub pixel can be controlled independently to produce thousands or millions possible colors for each pixel. The liquid crystal makes the light to pass through the other by twisting the polarization of light entering one filter. By applying a small electric charge to transparent electrodes over each pixels or sub pixels, the molecules of the liquid crystal are twisted by electrostatic forces. This reorientation of the liquid crystal makes the image.

LCD screen is too sensitive to mechanical shocks and heat , since the pressure may squeeze the fluid present in between the plates which can cause its permanent damage. Excessive heat can change the physical properties of the liquid so some part of the screen may damage and appear as black spots or segments.

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