Difference between LCD and LED

Difference between LCD and LED :-

LCD is a liquid crystal display and LED is light emitting diode, both LCD and LED TVs or any other screens are Liquid crystal display.The basic technology in both of them is same as both type consist of two layers of polarized glass through which liquid crystal allows and blocks light, LED is basically a subset of LCD TVs.

LED screens differ from the LCDs in such a way that in LCD fluorescent lights are used while in LEDs light emitting diodes are used, another thing is placement of light on screen, fluorescent lights in LCD are always behind the screen while light emitting diodes on LEDs are placed either on behind or on corners of the screen thats the reason LEDs TV are slimmer than the LCD TVs.

LED TVs provide better and clear picture because of two reasons first LED TVs work with wheel or distint RGB- colors to produce share colors and second, Light emitting diodes can be dimmer which helps in maintaining the colors and sharpness on picture.

Simple 100 Watts UPS inverter circuit

Simple 100 Watts UPS inverter circuit:-

The main component of UPS ( Uninterrupted Power Supply) is Inverter and Power Supply, today i am going to give you a simple Mosfet based 100 watts inverter using IC CD 4047 and IRF540 Mosfet.
This circuit is so simple you can implement it varo board as well.

CD 4047 is very low cost astable/monostable multi-vibrator IC, in this circuit it is wired as astable producing two pulse trains of about 0.01 s which are 180 degree out of phase at 10 and 11 pin.Pin 10 is then connected to gate of Q1 and pin 11 with Q2 gate.

Two resistor R3 and R4 are used to prevent loading of IC by Mosfet. When the pin 10 is high Q1 conducts and currents flows from the upper half of primary winding of transformer which generated positive half cycle when pin 11 is high Q2 conducts and current flows through the lower half of transformer creating negative half of AC wave form.

Click on image to see large 

Notes:

• B1 can be 12volt/6Ah lead battery
• Q1 and Q2 should have heatsink
• T1 can be 9-0-9 V primary and 230 secondary
• Its only for low grade applications.

Nokia Lumia 925 review and specifications:

Nokia Lumia 925 review and specifications:

Review:

Nokia Lumia 925 is the latest Nokia's phone in Lumia series, about 70 percent of windows phone are Lumia. Again from Nokia, Lumia 925 is also a windows phone and for the first time Lumia

introduces Metal to the family. It is a renegade.

Core of Nokia lumia 925 is similar with the Lumai 920, but externally it is completely different proposition.Now it is a non unibody monochrome device.

Its great in grip and thanks ti the aluminum sides, looks like Samsung Galaxy S4 mainly due to mid size 4.5 inch screen.

Its a completely a wireless phone with Bluetooth, 3G, and GPS with NFC and 4G mobile internet.
Its has FM radio which is often out of top end phone.

This phone has AMOLED screen  with 4.5 inches size and all other screen features are same as Lumia 920. It has resolution of about 1280 x 768 pixel with 332dpi, its same like HTC one and Galaxy S4.It has PenTile screen which refers to the red, blue and green dots that make up each screen pixel.

Specifications:

•  2G/3G/4G network
• 139g weight
• 5.08 x 2.78 x 0.33 in
• AMOLED screen
• 768 x 1280 pixels
• Corning Gorilla glass 2 protection
• MP3, WAV
• Class B GPS, upto 236.8kbps EDGE
• Micro USB
• 8Mp front with Carl Zeiss optics, image stabilization camera
• 1.3Mp secondary 720p camera
• Windows 8 operating system
• Qualcomm MSM8960 Snapdragon
• Dual Core 1.5 GHz Krait
• Adreno 225 GPU
• Accelerometer, Gyro, proximity, compass
• GPS
•  White, black, gray colors
• Up to 440  stand by