And the price of phone is reasonable and as low as possible

phone contains the charger, car charger and jammer.
Weld parts due to the role of the force at time of press sealing off, causing the phone to shut down. Maintenance, in a targeted manner to strengthen key lower part of the integrated circuit or component welding generally solve the problem. The caller calls shutdown shutdown is the mobile phone can boot, network, can call the phone ringing sound when a call, the phone shut down. This failure appears to be complex, is actually very simple, calls will be shut down? Is nothing more than ringing sound caused. Ring a ring, why would shut down? This is because a lot of ring work when battery voltage BATT + direct power supply, when the ringing of leakage, it will result in phone calls shutdown. phone has the dynamic jamming range.The company should monitor and supervise the production process of phone.Therefore, mobile phone repair personnel on hand should have a containing current, voltage meter multi-function round-trip run power, for maintenance use. Maintenance ammeter connected in series in the mobile phone power circuit, by measuring the total current of the mobile power supply circuit to determine the fault location. 1, press the power button, the ammeter pointer does not move or logo placed, the phone can not boot. This phenomenon is the cause boot signal circuit or power IC does not work. 2, press the power button, there are dozens of ma current, then back to zero, the phone can not boot. There are dozens of ma currents, indicating that the basic failure of the power part of the multi-clock circuits, logic circuits or software is not normal cause. The feedback of the customer is very important for phone .And the price of phone is reasonable and as low as possible
If the current minor move, the clock circuit should be normal, general software failure, if not swing, failure or CPU clock circuit did not work properly. In addition, dozens of ma current stops moving, press the switch button no response, in most cases for a software failure. Does not boot, the boot key ammeter pointer indicates current 200ma or so pause immediately back to zero, which is a typical piece of code data confusion caused by the software does not boot. Phone power leakage (do not press the power button) there are 20 to about 30ma. The power part of the component short-circuit or damage. Press the power button, a large current, indicating that the power supply part of the short-circuit phenomenon, or the power amplifier part of component damage. The manufacturer has cut the price of phone .  Able to boot the standby current than normal. Showed that the load circuit component leakage. Remedy: power to the mobile phone, after 1-2 minutes with the back of which a component to feel hot, be replaced, in most cases, troubleshooting. 7, the phone is switched on to play 112, observed changes in the current, if the current change is normal, then the emission current is normal, in the absence of current changes, then the transmitter circuit does not work, if the current change is too large, a general description of the amplifier circuit is broken.

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STMicroelectronics exceeded the limits of LED camera flash

STMicroelectronics (referred to as ST) will allow for compact digital cameras and smart phones to meet the user to improve the built-in flash output power requirements, while supporting the more advanced user control.

STMicroelectronics new chip STCF04 of a built-in flash / best LED flashlight, dual-mode camera flash controllers, LED flash module maximum power from today, generally a few watts of power designed to improve more than 40W, the issue of outdoor security floodlights level brightness. The new product offers more flash and flashlight brightness control feature, the flash mode has 8 user-selectable brightness, LED flashlight mode 12 user-selectable brightness, and a light sensor input. The controller chip built-in flash and torch safety timer, temperature sensor and short circuit protection.

STCF04 STMicroelectronics unique architectural design, integration of a super capacitor, a high-current MOSFET switching of discrete devices and multi-branch high-power white LED light, is the ideal choice for high brightness emergency flash and the camera and camera phone flash.

MOSFET discrete devices STCF04 of power than similar products key, because the other brands of controllers only integration of a power MOSFET. The new product design alternative to traditional high-power xenon flash (to xenon flash) with LED flash, to meet the requirements of todays high-pixel camera sensor, the higher light, but also has the advantages of compact design and simple.

STMicroelectronics has begun to the two major partners Murata (of MURATA) and OSRAM provides STCF04 sample. Murata Manufacturing Co., a market leader in the super capacitor manufacturers, Osram is the worlds leading supplier of flash module of the smartphone, the two companies have begun to show the latest products using the chip.

STCF04 main features:

Maximum flash power> 40W

Torch-mode current (the torch current): 1 x 320mA

100mA Red LED privacy indicator light output; 12 adjustment

Address optional I2C bus

Temperature sensing, short circuit shut down, overvoltage protection and security features of flash / flashlight mode timer

STCF04 TFBGA package 3 x 3mm, 25-ball has been available for sampling. Is expected to begin volume production in the first quarter of 2012.

More LED items: 12 volt LED lights and others.

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Type of UPS Uninterruptible Power Supply

UPS design of the model is divided into several types that produce different performance characteristics:

A. Standby

2. Line Interactive

3. Double Conversion On-Line

4. Delta Conversion On-Line

Standby UPS types

This type is commonly used by home users for the Presidency with their PC. UPS to be able to do this type of filtration against power failures and flow management, in addition to design efficient, small size and inexpensive.

Line Interactive UPS types

UPS is the type most often used in small business unit, web developer, and a number of servers located in government departments. Because, in addition to having high levels of reliability, this type also have the ability to adjust the voltage that is sufficient

fine.

UPS has an inverter is always connected to the output of the UPS system to convert the power from batteries into AC. In normal circumstances, the Inverter will perform battery charging. While in a state of power outages, Transfer Switch will close and drain power from the batteries to the UPS output. Position that is always connected to the inverter output filter provides additional power. This makes the type of UPS is widely used for server and electrical conditions are not too good.

Double Conversion type UPS On-Line

This type is most common for UPS with power more than 10kVA. These types have in common with the type of Standby. Only this type has a power source located on the inverter, not the AC power source. In this type, the main electricity supply interruption will not trigger a transfer switch for the incoming AC power to the central input to charge the batteries that provide power to the Inverter located at the output. Therefore, when the AC power is disconnected, the flow of energy will be transferred immediately without taking a break when the transfer occurs. This type of UPS above shows the performance of the average. Can be said of this type of approach the ideal of a UPS, unfortunately this type of heat is high enough.

UPS type Delta Conversion On-Line

Almost the same as the Double Conversion type, type Delta used to always supply voltage Inverter. When the power supply is interrupted, this type do the same with Double Conversion type. Delta Conversion has two functions, the first is to control the input power characteristics. While the second function is to control the input current to direct the process of charging the battery system. The thing to remember is to minimize this type of energy is wasted. In addition, it has a high compatibility to various types of generators and reduce the need for the use of cables.

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