Elpida Announces Bankruptcy, DRAM's Opportunity?

To the Elpida event,  TrendForce appoint out three possibilities including the availability of funds, debt restructuring; on disposal of plant, short-term pains; declares bankruptcy, the price soared. The details as:

1. Elpida Receives Funds, Debt Managed
Current rumors indicate the Japanese government intends to provide funds to save Elpida, under the condition that Japan's domestic DRAM and NAND flash product lines are consolidated. Furthermore, in order to make inroads into the mobile market, Elpida will lower the proportion of commodity DRAM produced at its Hiroshima fab, increasing mobile DRAM wafer starts instead. However, due to Elpida's limited NAND flash technology, the maker would still be unable to compete with the Korean manufacturers in the MCP (multi-chip packaging) sector. Therefore, there is a possibility that Toshiba, with second place in NAND flash revenue, will form a technological partnership with Elpida under the guidance of the government. If successful, the makers would be able to target the high-growth tablet PC and smartphone markets with MCP products, enabling them to go head-to-head against the Korean manufacturers.

Commodity DRAM would be produced mainly by Rexchip, and technology migration to the 25nm process would be accelerated. From a supply and demand perspective however, even if Rexchip handles the commodity DRAM production, the commodity DRAM market will still remain in a state of oversupply -average DRAM price will not increase by much. As for Elpida's liabilities, the maker may also negotiate for a debt-equity swap or even a partial debt write-off with the banks. It is unlikely Elpida will back out of the DRAM industry completely, as that would provide the least benefit to DRAM chip price.

2. Elpida Sells Fabs, Short-term Suffering Due to Technology Migration Adjustments
If the Japanese government gives Elpida a loan extension, the maker must find a way to survive on its own. After consolidation of the nation's LCD industry, the Japanese government has set their sights on the domestic semiconductor industry as well - merger discussions are currently underway with Renesas Electronics, Fujitsu, and Panasonic. The government also intends to divide IC design and chip production into separate businesses, with a future venture by INCJ managing  IC design . Chip manufacturing may go to Elpida's Hiroshima fab, which would lower the maker's commodity DRAM risk.


The rest article

TA31136 Radio Receiver Circuit Diagram

As shown, the circuit Vcc of 5 V supply. After the first single-conversion, the received signal becomes 21.7 MHz, and then after two 21.7 MHz crystal filter to enhance the selectivity of the input signal. T10 for the resonant frequency of 21.7 MHz in the week, and form selective frequency amplifier transistor Q2. VCC2 for 5 V bias voltage to the transistor. U3 (TA31136) 16-pin input signal of 21.7 MHz and 21.245 MHz, a foot of the vibration signal carried mixer to form two intermediate frequency 455 kHz. IF amplifier, the demodulation signal from the 455 kHz frequency discriminator low-pass filter composed of internal resistor R64 and an external capacitor C116, filtered intermediate frequency and high-order harmonic into the low amp circuit.

Before the Kam-frequency part of this program in 10 feet and 11 feet out in the week, the results found in weeks coil is difficult to debug, and later switched to Murata Seisakusho Ceramic Discriminators Frequency CDB450C24. Because the simple structure CDB450C24, easy to implement, the frequency accuracy of plus or minus 1%, about 10 kHz bandwidth, and do not need to load capacitance.

Hqew.net & Hqew.com Mascot - Huazai's First Public Appearance

Article comes from: http://www.hqew.net/events/news-article/2406.html

March 20 to 22th, 2012, the  11th Munich Electronics Fair held in Shanghai New International Expo Centre, W3, W4 and W5 Museum. Popular overflowing the exhibitors scene, in addition to the latest electronic products dizzying, live microblogging projection wall and the image of the doll "Huazai" of hqew.net & hqew.com at W4 Pavilion booth 4812 are high-profile.

In the showroom, LED large screen television greets microblogging information updated real-time display, passing the Show Daily, including members Exhibitors fans micro interactive content, to attract participants have come up with the phone to participate in real-time interaction, sharing exhibition new, new technologies, products and exhibitors experience.

Hqew.net & hqew.com mascot  "Huazai" is the first public appearance, the upper body warm yellow and stable black pants Andy broke the icy visual environment of electronic products, attracting exhibitors audience onlookers photo. Huazai is on behalf of the professional electronics industry and business boy. The yellow of the whole body is on behalf of vitality, wealth, passion, China. Rise in the mouth and smiling eyes, the tilt of the hair exposed vitality, confidence and optimism. Black tie itself, just like a smart business guy.

It is understood that this exhibition a total of 660 exhibiting companies, an increase of more than 39% attendance over 40,000. In addition, the show adopted a new theme area, the exhibition, seminars, prefectures and the advantage of the professional audience together show, "four in one, three-dimensional rendering in various fields of technological innovation, easier to promote the deal. Munich Shanghai electronic exhibition "high-end applications, technical victory for the positioning of the Chinese electronics industry colleagues to interpret the thinkers of the feast," Innovation Forum "covers the automotive electronics, new energy vehicles, automotive testing, power electronics, the LED, communication, medical electronics, portable technology, embedded systems, connectors, wiring harness, green manufacturing.

As the country's leading e-commerce platform,  hqew.net & hqew.com  actively play the roles as a bridge for the electronics industry chain, to promote the upstream and downstream component suppliers , engineers, buyers and the channel of communication and exchange to build a reliable platform.

Laser Power Supply Circuit

The power to produce an initial high pressure in order to achieve ignition, after ignition, laser voltage of approximately 300-1500V, if you need a higher ignition voltage (over 6000V), may be more in the D5 and D8 very level-fold pressure

5V/2A Isolated Switching Power Supply Schematic

The switch circuit as shown below: C1 is the input filter capacitance, VDz, and VD1 primary side clamp protection circuit. R1 for the control of the end resistance, C2 is a bypass capacitor. Parallel between the end of S-TOP414GC-C10 is to prevent high-frequency interference in the control side, sometimes caused by trigger power-off circuit malfunction. VD2 output rectifier diode, C3, C4, and L,, C5, and C6 constitute the output filter, C9 denoising output capacitance. The external error amplifier consists of the shunt regulatorTL431. When the output voltage fluctuations, R3, and R4, the partial pressure of the sample voltage with the reference voltage of the TL431, an external control signal, through the optocoupler PC817A the change TOP414G control terminal current, and adjusts the duty ratio Uo tend stability. The control loop gain is set by R2. The feedback winding voltage VD3, and C7 rectifier filter, the infrared receiver thePC817Ain the tube power supply.




Source: http://www.hqew.net/circuit-diagram/5V$2f2A-Isolated-Switching-Power-Supply-Schematic_2394.html

Application Circuit of LM1042 in the Car

Application Circuit ofLM1042in the car as shown. Power from the +12 V battery. The oil pressure switch S1 to select the probe. S1 is closed, in the ignition of the car 8 feet by the wind will pull into a low, select the level in the probe a measuring tank. S1 after the engine began to work disconnected, U + after VD1 8-pin pull-high, change the measurement level by the auxiliary probe 2. Even if the engine stall, C5, 8-pin remains high, be able to prohibit the probe to a measurement. HL is the oil pressure warning lights. The VD2 prevent reverse polarity power supply. RP1 is used to adjust the probe current, I = 200mA. RP2 used to calibrate the duration of each measurement. Closure of S2, the COSC is shorted, select a single measurement mode. Disconnect S2 to repeat the measurement mode. For changing the voltage gain of the A4 along the dotted line in Fig. Access resistor R7. Digital voltmeter connected to the between Uo2 side and Uo1 of using R5, C6 can filter out the high-frequency interference of the instrument input.
Source: http://www.hqew.net/circuit-diagram/Application-Circuit-of-LM1042-in-the-Car_2389.htmlhttp://www.hqew.net/circuit-diagram/Application-Circuit-of-LM1042-in-the-Car_2389.html

Human Body Sensor Switch Circuit Diagram

The human body sensors switch, using a special sensor integrated circuit  HT7610B , simple peripheral circuit, quite good performance, high reliability, are presented below:

According to the physical draw of the circuit see Fig. When the switch SW is placed in "automatic" position, the RE-200B convert the infrared sensor to the body to release a weak electrical signals sent to the HT7610B the {11} feet, internal two amplification and resistive and capacitive frequency selective network frequency selection output of 0.3 ~ 3Hz alternating signal, {20} feet {2} feet will output a voltage to the AC power, when this signal amplitude greater than 2V, the synchronized square-wave voltage to drive the triac zero trigger turn-on, lit the lamp.

Adjustment potentiometer VR1 is the delay time, delay lights-out time can be adjusted between 8-6 seconds after the lamp is lit; VR2 light and dark from the control to adjust the potentiometer, you can adjust the day and night between the Renyi Liang from the time control, lamp lit. Also the lighting of the pin (VDD) threshold voltage is 8V, also pin voltage is below 8V lamp can not light up, only higher than 8V lamp can light up.

RS485 Interface Schematic

RS485 is a half-duplex communication standard, must be controlled to a good bus transceiver state. RS485 inputs are open or has been terminated and no driver U1 and U2 will make it to the receiver output (RO) is high. Differential inputs A1 and B1, if the input byte data, the U1 side of the RO will produce a voltage jump, locked by the trigger 74HC74 and 74HC00 NAND gate state machine at the falling edge of the RO ON state. The state machine will be U2's driver Enable Pin (DE) pull is high, the input data bytes forwarded out from the U2 RS485 level.

120V Travel Power DC to AC Power lnverter

APC Travel Power DC to AC Power lnverter, DC 13.8V switch to 120V. This is imported APC car cigarette lighter interface of the inverter input 12-13.8V, output of the American outlet to 120V, 150W continuous power 75W. For laptop and cell phone chargers like 100V-240V wide voltage switching equipment. Laptop or digital electronic devices, power adapters are 110 ~ 240 design. So basically general-purpose device.

This is the APC vehicle electrical parameters of the inverter:
Input: 13.8V 8A the max DC voltage
Output, unless you 120Vac, 60hz 75W

With a battery low voltage protection, auto shut-off when the battery voltage is lower than 10.8V.

The small size of the inverter (length 115mm x width 75mm x 35mm), easy to carry, plastic housings, when used do not have to worry about leakage problems.








The images from http://www.hqew.net/events/news-article/2382.html

Solar Control Circuit

As shown, the dual operational amplifier  LM358 and R1, R2, constitute two voltage comparators, voltage reference VDD (+12 V) 1/2. Photoresistor RT1, RT2 and potentiometer RP1 and photosensitive resistor RT3, of RT4 and potentiometer RP2, respectively, constitute the photosensitive sensing circuit of the special features of the circuit is to automatically compensate for the strength of the ambient light. As shown below, RT1 and RT3 vertical visor side of RT4 and RT2 installation on the other side. RT1, RT2, RT3 and RT4 as well as by the environment of natural light effect, the center of the RP1 and RP2 voltage unchanged. If only RT1, RT3 by sunlight, RT1 internal resistance decreases, the potential rise of LM358 3-foot, 1 foot high output, the transistor VT1 saturated conduction, conduction of the relay K1, the changeover contact contact 1 is closed, while the RT3 resistance decreases LM358 5-foot potential was decreased, the K2 does not convert contact with the stationary contact 2 is closed, the motor M is transferred; Similarly, if only RT2, RT4 by the sun rays, relay K2 conduction, K1, disconnect the motor M reversal. Go to both sides of the vertical sun visor surface illumination at the same time, the relay K1, K2, are guided through the motor M stopped turn. In the sun constantly offset process, the strength of the illumination on both sides of the vertical sun visor alternate motor M turn - stop, turn - stop the solar receiver is always facing the sun.

4 photoresistor such cross-arrangement advantages are: potential decrease the potential rise of LM358 3-foot, 5 foot, potential decrease the potential rise of LM358 5-foot, 3 feet, allows motor reversing the work of both simply another reliable. Can be directly used to install the circuit board doubles as a vertical shell visor, to avoid photosensitive resistor RT2, RT3 to the shelter of the shade of trouble. The use of the device, do not have to worry about its ability to automatically return the next morning. Morning when the sun rises on both sides of the vertical sun visor illumination can not be exactly equal, so that the control circuit will control the motor, thus driving the receiving device eastward rotation, until the solar receiver at the sun.

Photoresistor Light Control of The Boost Circuit Diagram

As shown in the light-control step-up circuit. The circuit is commonly used in emergency automatic lighting. When sudden power blackout, light dependent resistor RL will be loss of light illumination and high-impedance state, 2 feet in low the  TWH8751  integrated circuits, consisting of TWH8751 such as oscillation circuit, 4 pin output a series of pulse current boost by the transformer T, lit fluorescent tubes EL automatic lighting outage.

SL134 Sensitive Temperature Control Lights Schematic

The thermostat is applicable within the range of -5 to 120 ° C, the circuit shown in the figure. AT is the the SL134 constant current source IC, it has three pin-out, use it on the need to control the temperature, by the three leads and the circuit is connected. SL134  characteristics as the ambient temperature changes in the output potential.
In the figure, the four parts of the AT, R1, and R4, R3, + the RP1 form a thermal bridge. With the SL134 placement of temperature change, the potential of point A will also change the potential signal is directly added to the 3 feet of the op amp A1 (5G23). AT the ambient temperature change of 1 ° C, point A potential change of about 10mV. The RP1 by adjusting the potentiometer, plus a voltage to 2 feet of the A1, A1 to form a differential amplifier form the differential signal from the amplification of the 6 foot output. A1, 6-pin output a negative potential (-0.3V) greater than +0.7 V when the output voltage of A1 is 6 feet, VT2 deadline, the VT3 conduction, and to promote the VT3 conduction, the red LED VL1 lit; The VT1 deadline, VT2 conduction, and to promote the the VT4 conduction, the green LED VL2 light.

SB-100ATX Emission Component Schematics

SB-100 is a universal remote control components, the model of the remote control transmitter components for the SB-100ATX receiving component model for the SB-100ARX. SB-100ATX component is the high stability of the radio remote control transmitter circuit, a SAW devices is basically the same circuit with the CS900. Circuit including the C3356 and the SAW components contained by the UHF transistor frequency oscillation transmitting circuit and the launch of digital coding circuit  PT2262  coding circuit, as shown. SB-100ATX emission components with high frequency stability, the emission power, ability to adapt to the characteristics of the transmitting frequency in the range of 256 ~ 433MHz. This circuit uses a small chip components, the external dimensions of 65 × 38 × 15 (mm), the working voltage of 12V, using four digital encoding, there are four launch buttons.

TEA1062 Call Schematic

TEA1062call circuit as shown below, the TEA1062 is a Philips company production of bipolar integrated circuits, to complete the voice channels, the line interface and the interface functions of dial, dial and call using electronic conversion, low call using electronic conversion as low as 1.6V DC line circuit pressure to adapt to multiple machines in parallel. The figure is a typical application in the phone.

4-channel DAC Circuit Diagram

Circuit shown in Figure 1, this circuit can use a DAC chip, output 4-channel analog signal, the output multi-channel analog Select / distributor IC1 (4052) input A, B, control, chip select control side a "o", A-B "o", when the output signal of the A1 A2 and given away through the ICl relative to the input side, select the output of buffer A2 side after multiple in ICl and Rl fed back to the A1 anti- input, the loop gain is 1. C2 is a sample and hold capacitor. Output an output voltage and the DAC output voltage. A and B side of the control state change, you can select a different output, E ==: "1" the output side has not been selected due to the sampling of the role of the hold capacitor, the terminal voltage to maintain the value of the previous state. To enable the best performance, the sample hold capacitor C2 ~ C5, to use the leakage is very low capacitance, A2 ~ the A5 input end of the current can not be a typical value 1pA. P1 is used to adjust the output of A1 drift. R2 is used to in ICl switch output channels A1, a gain of 1. The current consumption of the circuit is less than 10mA, the UDAC should be between -3.5 and +3.5 V.




The circuit from http://www.hqew.net/circuit-diagram/4$2dchannel-DAC-Circuit-Diagram_2330.html

Amplifier Circuit Diagram Produced by TDA7294

The integrated amplifier circuit  TDA7294  is a Hi-Fi, high-power DMOS integrated amplifier circuit that is launched by famous European SGS-the THOMSON company. Today I will introduce three TDA7294 amplifier block the production of integrated power amplifier circuit.

1. OCL Circuit
OCL circuit diagram shown in Figure 1, the circuit is a dual channel using two TDA7294 70W amplifier. External components, the circuit is simple, available in 8 ohm load when the supply voltage for the soil 35V 70W of continuous output power. Very suitable for the playback of the environment less than 30 square meters. Rectifier circuit shown in Figure 4, such as the speaker impedance is less than 8 ohms, the power supply voltage should be reduced accordingly.

2. BTL Circuit
BTL circuit shown in Figure 2, the rectifier circuit shown in Figure 4. Two TDA7294 bridge composed of the BTL amplifier circuit, the output power up to 150W, suitable for the place of the dance halls that require high-power, stereo, 4 TDA7294. Available on the 8-ohm load when the supply voltage for the soil 25V 150W of continuous output power. When the supply voltage of ± 35V, 16 ohm load, availability of continuous output power of 180W. With TDA7294 for BTL amplifier, the load shall not be less than 8 ohms.

3. Constant-current Amplifier
Constant-current amplifier circuit shown in Figure 3, the rectifier circuit shown in Figure 4. Of the amplifier circuit is somewhat different from the previous two structures, the feedback circuit for the current sampling voltage summation negative feedback. This circuit structure is commonly known as constant-current amplifier, the circuit analysis for detailed description is only the more prominent advantages compared with the conventional constant voltage amplifier.



①The amplifier output current and load impedance has nothing to do, even if the load short circuit, it will not cause the amplifier block overheating.
②Output power increases with the increase of the load impedance to drive the speaker load certain power reserve to ensure the bass of the original music signal strength and high-frequency resolving power.
③The role of the speaker voice coil force is only dependent on the current. Speaker driven flow control oscillation bound to be faster than the VCO, the speaker vibration system.
④Input and output impedance is easy to do matching. Constant-current amplifier circuit is actually a control input signal voltage controlled current source. Its internal feedback circuit for the current sample, the voltage sum of negative feedback, input and output impedance characteristics. High input impedance, just pre-constant voltage amplifier circuit, no loss of signal voltage to the amplifier input. The high output impedance, can reduce the internal resistance of the shunt on the signal, is conducive to the output signal current is added to the load. Figure 3, the supply voltage is selected as ± 35V, the magnification ratio of the decision by the speaker and R6.

TDA7294 Datasheet, download  here

These datas come from http://www.hqew.net/circuit-diagram/Amplifier-Circuit-Diagram-Produced-by-TDA7294-_2315.html

DS8921M - Differential Line Driver and Receiver Pair

DS8921/DS8921A/DS8921AT - Differential Line Driver and Receiver Pair


General Description
The DS8921, DS8921A are Differential Line Driver and Receiver pairs designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, these devices meet the requirements of the EIA Standard RS-422.



The DS8921, DS8921A receivers offer an input sensitivity of
200 mV over a ±7V common mode operating range. Hysteresis
is incorporated (typically 70 mV) to improve noise margin
for slowly changing input waveforms.



The DS8921, DS8921A drivers are designed to provide unipolar differential drive to twisted pair or parallel wire transmission lines. Complementary outputs are logically ANDed  and provide an output skew of 0.5 ns (typ.) with propagation   delays of 12 ns.


The DS8921, DS8921A are designed to be compatible with TTL and CMOS.



Features

• 12 ns typical propagation delay
• Output skew - 0.5 ns typical
• Meet the requirements of EIA Standard RS-422
• Complementary Driver Outputs
• High differential or common-mode input voltage ranges of ±7V
• ±0.2V receiver sensitivity over the input voltage range
• Receiver input hysteresis-70 mV typical
• DS8921AT industrial temperature operation: (−40°C to +85°C)

Other ic parts you would like to know：

EPM7128SQC100-7    EPM7256AEQC208-7    DSP56002FC66    DS8921M    DS26LS32CN    DS1489AM    DS90LV047ATM    CP82C55A    CM8888PI    MMBT2222ALT1G    MMBT3904LT1    MMBT3906LT1    MM74C922N  

The Datasheet of EPM7128S

EPM7128S Features



1. 5.0-V in-system programmability (ISP) through the built-in
IEEE Std. 1149.1 Joint Test Action Group (JTAG) interface available in
MAX 7000S devices

– ISP circuitry compatible with IEEE Std. 1532

2. Includes 5.0-V MAX 7000 devices and 5.0-V ISP-based MAX 7000S
devices

3. Built-in JTAG boundary-scan test (BST) circuitry in MAX 7000S
devices with 128 or more macrocells

4. Complete EPLD family with logic densities ranging from 600 to
5,000 usable gates (see Tables 1 and 2)

5. 5-ns pin-to-pin logic delays with up to 175.4-MHz counter
frequencies (including interconnect)

6.
PCI-compliant devices available

7. High-performance, EEPROM-based programmable logic devices
(PLDs) based on second-generation MAX® architecture
For information on in-system programmable 3.3-V MAX 7000A or 2.5-V
MAX 7000B devices, see the MAX 7000A Programmable Logic Device Family

Data Sheet or the MAX 7000B Programmable Logic Device Family Data
Sheet. Review EPM7128SQC160-15

NE592 Datasheet: Video Amplifier

NE592 Description:

The NE592 is a monolithic, two-stage, differential output, wideband video amplifier. It offers fixed gains of 100 and 400 without external components and adjustable gains from 400 to 0 with one external resistor. The input stage has been designed so that with the addition of a few external reactive elements between the gain select terminals, the circuit can function as a high-pass, low-pass, or band-pass filter. This feature makes the circuit ideal for use as a video or pulse amplifier in communications, magnetic memories, display, video recorder systems, and floppy disk head amplifiers. Now available in an 8-pin version with fixed gain of 400 without external components and adjustable gain from 400 to 0 with one external resistor.
NE592 Features:

• 120 MHz Unity Gain Bandwidth
• Adjustable Gains from 0 to 400
• Adjustable Pass Band
• No Frequency Compensation Required
• Wave Shaping with Minimal External Components
• MIL-STD Processing Available
• Pb-Free Packages are Available

NE592 Applications:

• Floppy Disk Head Amplifier
• Video Amplifier
• Pulse Amplifier in Communications
• Magnetic Memory
• Video Recorder Systems

More NE592 datasheet, download here!
Related parts: NE5532    NE592D14    NE5532DR

9W Audio Power Amplifier (μPC2002) Schematic

μPC2002  audio power amplifier IC, a 5-pin single in-line plastic package, according to the shape of the lead can be divided into H-type and V-shaped. The output power of the circuit, distortion, low noise, impact sound power, and power surges, over-voltage and load short-circuit protection circuit, which is widely used for car stereo radio recorders for audio power amplifier. Typical application circuit as shown.
Would like it at http://www.hqew.net/circuit-diagram/9W-Audio-Power-Amplifier-%28%CE%BCPC2002%29-Schematic_2300.html

Chopper IGBT

Althogh the internal working mechanism of switching devices is different, refer to the analysis of the buffer circuit, you only need to consider the external characteristic of the device, the IGBT turn-off model can be equivalent to a voltage-controlled current source, the opening can be equivalent to a voltage control voltage source. The chopper as shown in the general IGBT snubber circuit model.

More details http://www.hqew.net/circuit-diagram/Chopper-IGBT_2294.html

Infinite Thin Mobile Phone

n the United States 2012 consumer electronics show, Chinese manufacturers Huawei technologies released a body in the thin thickness is only 6.68 mm smart phone  Ascend P1 S, become the CES smart phone thin. A few days before the Spring Festival of Chinese the traditional Chinese calendar, Japanese manufacturers NEC the company unveiled a fuselage is only 6.7 mm thickness smart phone Medias ES N-05 D, and Huawei that style of Ascend P1 S counterparts. Not the thinnest, only a thin, the industry still can be in "thin splendid", "thin out selling point" on how far?We can see above the thickness of the claim, and not all the thickness of the fuselage, but the thinnest thickness of the place, because some of the devices and the thickness of the design challenge, to make mobile phone in the "unlimited thin" on road to meet very big obstacles.
When the phone screen diagonal size has a transparent, the thickness of the smart phone has become the cell phone manufacturers now than the important selling point. But, do big easy, sacrifice some cost choice, but to do "ultra-thin" is not easy, and not cost to do, the challenge of it too much.
Reliability and standby is huge challenge. "Three ability, two challenges, profound, and each is a difficult to conquer mountain. More important production, high cost need highly profitable to bear and China's brand of mobile phone price insurmountable RMB 3000 Yuan.
There is a kind of show/touch screen solutions can also be reduce thickness and bring down the cost of advantage. Although AMOLED patent was Samsung firmly to control, but Touch on lens (TOL) and on cell technology can dramatically reduce the thickness of the Touch screen.
Article source: http://www.hqew.net/events/news-article/2339.html

LM3909 LED Flasher Circuit

Here is a very simple  and practical LED flasher circuit using  LM3909 IC. LM3909 is a great LED flasher IC operated only on 1.5 volt DC and gives a bright-high current LED pulse and work on wide temperature range. This IC has a very low current consumption due to which a 1.5 volt (C) size cell or 1.5 volt AA size alkaline battery will last more than a year on continuous operation.

The figure comes from http://www.hqew.net/events/news-article/2313.html

The New Ipad Will Cause Great Pressure To The Screen Manufacturers

The success of Apple  products,of course,because of its high prestige and huge capital.But,another little-known main reason is the low contract between Apple and its parts factory,which is tackey compared with its talented design.
Apple's large scale, and parts sharing between Ipad and Iphone,cause Apple can purchase key parts at a low price,such as processor and displayer.It is difficult for any other company who want to do tablet PC to compete with Ipad's $499 price,because their cost are higher than Apple.
Apple's tablet PC competitors are always in a position of being defeated.Now the new Ipad issued,it is forecasted that Apple tablet PC's 62% market share will go on to rise,maybe to 70% this year according to professional statistics.
Over the past year,dozens of companies think themselves have opportunities to compete with Apple,there are more than one hundred of tablet PC appeared in the 2011 Las Vegas consumer electronics show.All dreams broken over one year.An big reason why Ipad2 is steady is that it has more competitive price than its competitors.
Microprocessor is the brain of all sorts of device,according to the information of California market research company,Apple is the the world's largest microprocessor buyer.On January,2011,Apple revealed himself to spend $3.9 billion on signing with suppliers,assuring that there is no any problem on supply chain for an very strategic part.But Apple does not reveal what is the key strategic part.Very few companies are able to draw out so much money to formulate an contract.
It is a win-win situation for Apple and its suppliers.British industry ARM holdings is an good sample,who authorize Iphone and Ipad to use its chips.The day Apple published the new Iapd,and the next day ARM's stock price soar nearly 4%.Apple's other suppliers,including CirusLogic,JabilCircuit and Skyworks Solutions,their share price are all steady in recent months.
The New Ipad Will Cause Great Pressure To The Screen Manufacturers
For the users,no doubt it is an extreme visual enjoyment to experience the shock effect which brought by Retina display screen at any time and anywhere.But it is quite a challenge for Apple's manufacturers of this parts.According to the latest news of the foreign research organization NPD,Samsung,Sharp,LG three screen manufacturers will facing with huge pressure on producing Retina display screen.
NPD shows,the screen produced by above three manufacturers are always using so-called a-Si TFT technology,that is amorphous silicon thin film field effect transistor.But after testing,the specification of new Ipad's Retina display screen is obviously higher than a-Si TFT,that is equipped with 264 pixels every inch in the area of 9.7 inches,which is not a-Si TFT can achieve.
Early in the last year,it is said that Sharp has already produced the screen for the next Ipad.But it exist doubt in January this year,some media said that Sharp's IGZO screen couldn’t reach the standard of Apple.Now we can see,the production of Retina display screen is really a big challenge,whether the new Ipad will be in short supply because of the production capacity of the screen?We will know in the later.
This data comes from http://www.hqew.net/events/news-article/2327.html

AC Circuit on The DC Bias Immune

The circuit is designed to a 250kHz frequency amplification Tai the tributaries bias prompted the low-frequency. Main the amplifier  NE540L  the gain 101, while the overall gain for the  NE536T  DC, of ??these two gain part of a network of roadside for the DC input bias circuit for common-mode voltage can be transformed into the main amplifier input.

Cold Cathode Fluorescent Lamp Power Supply Circuit

The circuit is an efficiency of 92% for cold cathode fluorescent lamp power supply, backlit LCD display for mobile devices. The circuit efficiency is largely determined by the component types, especially types of C1, Q1, Q2, L1 and T1, the manufacturers of these components have a comment.
Refer to here

Simulated Inductor Circuit

In the constant current excitation, the voltage drop that flows through the  inductor , the voltage as the frequency increases. An active device can be used as an inductor, and its output as the frequency increases. This circuit and the effective inductance (L = R1R2C) to produce a feedback. The Q of the inductor depends on the R1 equal to R2,. At the same time, the forward and reverse feedback path of the amplifier are the same.

Comes from http://www.hqew.net/circuit-diagram/Simulated-Inductor-Circuit_2255.html

A Simple Charger Circuit

General battery charging with constant current mode, so just to control the charging time to complete the charging of thebattery. From the appearance of the battery point of view, it is a nickel-metal hydride battery capacity of 1450 mA.

Its standard charging method:145 mA rechargeable battery rated capacity of 1/10 current 14 to 16 hours the charger measured charging current of 170 mA, the charging time is about 12 hours.
Production of the required components:a transformer, power of about 10W, the voltage of the secondary winding 12 "15V; a 7812 three terminal regulator IC; a IN4008 diode 4 (or 1A/200V rectifier bridge). 2200UF/50V electrolytic capacitors 0.1UF nonpolarized capacitors, one each; resistor a 56 ohm (resistance size according to custom); can hold four batteries of the battery box a; board a Wire.
Description and attention to the point:in accordance with circuit diagram selected components assembled circuit, carefully check to ensure that the welding is correct. Three-terminal regulator IC to install the heat sink. Resistance of the power of 2W, the best flame retardant resistance. Reserve a certain space around him in the circuit board mounted resistance, because resistance also has a larger heat.
The charging timeis calculated as follows: the capacity to be filled is 1450/10 * 14 = 2030 mA charge current of 170 mA Charging time for the 2030/170 about 12 hours according to actual needs, change the resistor size can change the charging current within a certain range, it controls the charging time. However recommended not to use high-current charging, so as not to affect the battery life under normal circumstances. The charger to the battery to recharge a battery, camera 200-300 sheets (LCD viewfinder screen on the Olympus C-860L can be normally open, occasionally using the flash), use has been more than four months, the battery life has been good. To make the charger only spent more than a dozen since the price is high, use is also very satisfactory.
Note:J1 power supply printed circuit board transformer secondary output, J2, the battery pack. D-board silicon rectifier bridge.

The Typical Application Circuit of iW1689

The  iW1689  is not only efficiency, but also provide some key built-in protection features can reduce the number of external components to reduce B0M cost. It eliminates the need for loop compensation components, and provide a stable output state of the entire work. In addition, the built-in power limit function allows to optimize the design of the transformer in the common off-line applications, and support a wide input voltage range. Under light load, the iW1689 has a very low start-up power and operating current, which makes it possible to meet the requirements of the new power standard for the average efficiency and standby power consumption.

The iW1689 built-in constant current mode and constant voltage mode, using the iWatt primary patented feedback algorithm to control the secondary output, without any sub-detection and control circuit, iW1689 accurate secondary constant current. Its high power output, the PWM mode to PFM mode control, in the low power output, to minimize power consumption.
The iW1689 the main features include: As a result of the primary feedback, no opto-isolated feedback circuit simplifies the design, support the work of the multi-mode in order to achieve maximum efficiency, ± 4% output voltage regulation, requires no external compensation components, built-in soft-start function. Short circuit protection, the secondary constant current control function, with a primary feedback to the fixed 40kHz switching frequency.

The Application Circuit of LC40159

In this circuit, Vin said power supply input voltage, input voltage range of 2.7 to 5.5 V; Vref is is the internal reference voltage; input "H" signal when the LED begins to glow, enter "L" signal when the LED goes out. In the the RSET end outside the resistor to produce a constant current. At VOUT is the output of the boost circuit, white LED cathode connection. Synchronization with the output of the oscillator circuit due to the converter output voltage VOUT fluctuations in order to curb the volatility of the output voltage, V0UT end parallel output capacitor. The LC41059 the LED1 ~. LED4 connect the negative of the white LED. The LC41059 the of the following three units.
(1) Charge pump booster circuit.
(2) Constant current generating circuit.
(3) Output current controller.
Source: http://www.hqew.net/events/news-article/2228.html

Apple Issues Invitations Conference To Be Held In San Francisco On 7th,March

Beijing Time on 29th, February morning news, Apple  issued invitations on Tuesday, inviting industry participants to attend the conference which held in San Francisco on U.S. Pacific Time 7th ,March 10:00am (Beijing Time on 8th,March,2:00am early in the morning),it is expected that Apple will be announced the launch of Ipad 3.

Apple did not explicitly revealed what product will be published in the letter of invitation, but the invitation showed a corner of the Ipad, and the words of "we have something you really have to see.And touch". Earlier today the CNBC reports said,Apple will complete the event and publish Ipad 3 in New York. Apple invitation letter did not talk more about the information of the Ipad 3.
The conference will be held in San Francisco Grass Art Center, which is one of the place that Apple often release the new products.There had been media reported that Apple will be publish Ipad 3 in the early March.Compared with the Ipad 2,the characteristics of Ipad 3 expected to including the improvement of the screen resolution,four nuclear chip,and support LTE 4G network,etc.
The Apple spokesman declined to comment.
Affected by this news,Apple's share prise rose 1.3% to $532.4.According to the statistical data of the market research company Factset,it showed that Apple's share price had increased by about 30% in 2012,its market value is rapidly approaching $500 billion.
Apple ceo Tim Cook said on the annal shareholders meeting last week,Apple's US$97.6 billion cash and investment "exceeded the capital to operate a company that we need".He reiterated that Apple is expanding active discuss on the problem of how to deal with the huge cash,it choose issue dividends,repurchase stock or use in acquisition business and so on.He said that Apple has been in the depth to consider the use of cash,and is actively conducting consultation with the the board on the relevant strategic.

Kodak Sells Online Gallery to Shutterfly

With the slogan "you press the button, we do the rest," George Eastman put the first simple camera into the hands of a world of consumers in 1888. In so doing, he made a cumbersome and complicated process easy to use and accessible to nearly everyone.
Since that time, the Eastman Kodak Company has led the way with an abundance of new products and processes to make photography simpler, more useful and more enjoyable. In fact, In a long time Kodak has been known not only for photography, but also for images used in a variety of leisure, commercial, entertainment and scientific applications. The company has ever  ranked as a premier multinational corporation, with a brand recognized in virtually every country around the world.Kodak operates in three segments: Consumer Digital Imaging Group (CDG), Graphic Communications Group (GCG) and Film, Photofinishing and Entertainment Group (FPEG). In March 2011, the Company acquired Tokyo Ohka Kogyo Co., Ltd. In November 2011, it sold its Image    Sensor  Solutions (ISS) business to Platinum Equity. In January 2012, the Company sold its online photo service business to online photo publishing company Shutterfly Inc. at the price of  $23.8 million and filed voluntary petitions for chapter 11 business reorganization in the United States Bankruptcy Court according to the Associated Press report.
The publishing company said Kodak Gallery has more than 75 million users. Those who don't want their photos transferred to Shutterfly can apply for withdrawal and get their photos through free downloads or buying DVDs from Kodak Gallery.
Shutterfly stock, which fell 45 cents to close Thursday at $26.91, climbed $3.79, or 14.1 percent, to $30.70 in aftermarket trading after the announcement and it will keep on going up according to the positive situation.

Source: http://www.hqew.net/events/news-article/2223.html

4 Reasons for Low Profits of China's IC Design

According recently media report: analog IC designer -  Linear  achieve profit margins above 75%, more than Apple and Microsoft, known as "the most profitable company.

The reason for Linear Technology's focus on product innovation and performance demanding industrial, communications infrastructure and automotive markets, to avoid the field of consumer electronics products, this marketing strategy to maintain high profit margins provided a guarantee. Another factor is that most of Linear Technology's products are proprietary, high-performance market segment, there is no direct replacement products. In addition, the link of customer communication, Linear arrangements the most experienced design engineers to communicate with customers to obtain first-hand information of the customer design challenges. Pay more attention to team building, team stability and solidarity, and not deliberately seeking scale.

Linear Technology makes sufficient efforts in markets, products, customers and team, then achievements of today's high-profit, and for 30 years to achieve sustainable development.

The chairman of the China  Semiconductor  Industry Association IC Design Branch,  Wei Shaojun pointed out in the field of semiconductors, the average gross margin level of 40%, the Chinese IC design industry average gross profit level is 12.39% lower than the international average, the average gross of the top ten design companies profit of 31.3%.

Then, Wei Shaojun pointed out 4 reasons for low profits of China's IC design industry.

First,  the lack of product innovation, market price is not high. A large number of IC design enterprises due to the lack of the ability of the product definition, have to follow the strategy. Therefore, product innovation is not naturally sell at good prices.

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