The principle of Xenon flash: Xenon flash, also known as high-intensity gas discharge flash. The Xenon flash lamp consists of a xenon bulb, a transformer ballast, and an insulated wire. It uses a special helium gas to fire the discharge in an ultra-high voltage state. The working principle is that after the trigger of the camera is triggered, the 12V power supply is raised to a high voltage pulse voltage of more than 20,000 volts in an instant through a transformer, and the helium gas in the xenon bulb is activated to generate a 6000K--10000K color temperature in the arc. Strong light, the color is crystal white, slightly purple blue. When the shutter is pressed, the shutter feeds back a signal to the CPU, and at the same time, the CPU synchronously outputs a control signal trigger circuit to the triode for flashing. Then the transistor is turned on, so that the trigger capacitor begins to discharge, and a pulse current is generated at the primary of the transformer. This current causes the secondary of the transformer to generate a high voltage of nearly 4000 volts, which excites the internal xenon ionization of the flash lamp and conducts. The electric energy stored on the capacitor is instantaneously converted into light energy by the discharge of the flash tube to complete a flash.
Early flash lamps have a very short life, and some magnesium tubes can only flash once. According to industry standards, at the time, 10,000 times, the real life expectancy should be far less than 10,000 times. The current flash, after technical transformation, should have an increased life expectancy.
The principle of LED flash: LED does not emit light through the internal electronic transition of the atom, but by applying a voltage across the PN junction of the LED, the PN junction itself forms an energy level, and then the electron jumps at this energy level. Change and produce photons to illuminate. The service life of qualified LEDs at rated power should reach about 100,000 hours. If the mobile phone is designed to use the LED's drive current beyond the rated current, the LED life will be greatly reduced to thousands or even hundreds of hours.
10 inch tablet is the most important size on tablet market. Which kind of clients like more? The answer is loving bigger size or storage, longer working time, etc. Since Android Tablet 10 inch is usually equipped with full HD screen, memory support up to 8GB, storage up to 256GB, battery up to 7000mAh-working 5-8hours. However, 8 inch android tablet mainly up to 4GB ram 64GB ROM, 4000mAh battery. At this store, you can see more than ten different 10 inch tablets on sale and one 10 inch windows tablet with magnetic keyboard option, and high level CPU and SIM Card option. Besides, you can also see amazon tablet 10 inch with competitive cost, especially take above 1000pcs. Except android tablet, 14 inch 64Gb Student Laptop for online learning, 15.6 inch celeron n5095 business laptop, 15 inch intel i3, i5, i7 10th or 11th generation Gaming Laptop and 16 inch laptop with 4gb graphics card and 16gb ram 512GB ssd alternatives also.
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