What Is an E-Learning Portal?

Electronic products are related products based on electrical energy. They mainly include: watches, smartphones, phones, televisions, video players (VCD, SVCD, DVD), video recorders, camcorders, radios, recorders, combo speakers, and laser players. (CD), computers, game consoles, mobile communication products, etc. Because the early products were mainly based on electronic tubes, the original products were named electronic products.

electronic product

Electronic products are related products based on electrical energy. They mainly include:

English: electronic product

Ceramic capacitors: chip capacitors, medium and high voltage, safety capacitors, adjustable capacitors, discharge capacitors, high-energy capacitors;

Positive and negative temperature coefficient thermistor, high-precision adjustable potentiometer, high-voltage resistor

Chip inductor: high frequency inductor, power inductor, antenna coil;

Noise suppression components / EMI suppression filters (EMIFIL), chip beads, bead banks, DC / AC common mode choke coils, military-use composite noise suppression filters;

Ceramic oscillators (Resonators): pins, patch resonators (KHz, MHz), automotive resonators, sound table oscillators;

Communication equipment filters, sound table filters, RF filters, IF filters, frequency discriminators, media / antenna / transmitters, media bandpass filters;

High-frequency components: miniature chip capacitors for high-frequency use, chip dielectric antennas, dielectric resonators, radio frequency switches, coaxial cables;

High-frequency components (Microwave Modules) PLL components;

Electronic technology is

The world's first electronic computer

The size and prospects of the education electronics industry have always been the focus of attention within the industry. In recent years, it is generally considered that there are only billions of market-scale electronic dictionaries, PDAs, and other educational electronics industries. With the update of technology and the advent of the digital age, it has attracted more consumers, and the market size has expanded to about 20 billion. There are 500 million people in China who need to learn English. Taking a purchase rate of 5% as an example, it will reach 25 million units sold, calculated at an average price of 800 yuan per unit (the average price of electronic dictionary and digital learning machine selling price). The market size will reach 20 billion. The development speed of the education electronics industry is rapid. Taking Noah's boat sales as an example, in 2004, Noah's sales soared from 110,000 in 2000 to 2 million. From another perspective, the data shows that in the big English industry, books and audio-visual products such as tapes and VCDs have about 35 billion sales each year, and English training can also create 12 billion "brilliant records" each year. Since 2004, educational electronics have gradually replaced the functions assumed by books, audiovisual materials, and training through technology upgrades, and have begun to divide the cake of traditional industries.

The Ministry of Industry and Information Technology Operation Monitoring Coordination Bureau learned that from January to November 2012, China's total import and export of electronic information products was US $ 106.85 billion, an increase of 4.1% year-on-year, and the growth rate was 0.8 percentage points higher than that of January to October. Among them, exports were US $ 627.3 billion, an increase of 4.5% year-on-year, an increase of 0.6 percentage points from January to October, accounting for 33.9% of the country's foreign trade exports; imports were US $ 441.2 billion, an increase of 3.5% year-on-year, and the growth rate increased from January to October. 1.0 percentage point, accounting for 26.7% of the country's foreign trade imports. In November, the export of electronic information products was US $ 67.6 billion, and the single-month export volume reached a new high for the year, an increase of 9.2%; the import was US $ 48.8 billion, an increase of 4.3%.

St. Cote's exports of communications equipment, radio and television equipment, and electronic components have grown significantly. From January to November 2012, the export value of communication equipment, radio and television equipment and electronic devices reached US $ 133.1 billion, US $ 10.6 billion, and US $ 78.3 billion, respectively, a year-on-year increase of 14.0%, 13.9%, and 13.5%, which is driving the growth of export of electronic information products The growth of exports of computers, electronic components and electronic equipment was flat, with exports of US $ 214.6 billion, US $ 82.4 billion, and US $ 25.1 billion, an increase of 2.7%, 2.9%, and 3.7%. The export of home appliances and electronic materials showed a downward trend. From January to November 2012, the export of home appliances was US $ 78.3 billion, a year-on-year decrease of 9.3%.

Society has changed from the original

During the storage, transportation and use of electronic products, they are often affected by various harmful effects of the surrounding environment, such as affecting the working performance, reliability and life of electronic products. Environmental factors that affect electronic products are: temperature, humidity, atmospheric pressure, solar radiation, rain, wind, snow, dust and sand, salt spray, corrosive gases, mold, insects and other harmful animals, vibration, shock, earthquake, Impact, centrifugal acceleration, acoustic vibration, sway, electromagnetic interference and lightning.

The study of environmental factors mainly solves two basic problems: how to obtain objective data of these environmental factors; how to deal with these data. Data on objective environmental factors can usually be obtained in part from meteorological and environmental protection departments, but more must be obtained through actual measurement. For the measured data to be both reliable and typical, in addition to the need for a sound survey and test plan, instruments must be available that can record continuously, quickly, and at multiple points. If the obtained objective environmental data has a sufficient recording time, statistical analysis can be performed according to the frequency of occurrence. For products that require special reliability, extreme values of objective environmental data, or even statistically inferred extreme values, can be used to ensure that the product is foolproof in use. For products that require high reliability, a value of 1% for objective environmental data can be taken. For products with general requirements, a value of 5%, or even 10%, of the objective environment may be taken. If the objective environmental data recording time is not long enough, it is necessary to use mathematical statistics knowledge to process it. For example, measured data from microclimate surveys can be extended with relevant methods to extrapolate data that may be available in history;

With the increasing application of electronic technology, the reliability problems of electronic products have increasingly troubled maintenance personnel. There are many problems affecting the reliability of electronic products, among which noise is the most important aspect. The so-called noise is a general term for interference signals that cause bad effects on people or equipment. Such as: sound, image signals that cause unpleasant physical and mental feelings, signals that the machine is working incorrectly, etc.

The attitude towards noise is the same as that of fire, and adequate measures must be taken in advance, otherwise it will cost money and time. In the design or trial production of electronic products, there must be ample tolerance for noise-free working conditions, which is the prerequisite for ensuring the reliability of the equipment.

Working conditions for reliability of electronic products

Moisture in the insulating material of electronic products will reduce the insulation and generate leakage current to form noise. Therefore, the place where electronic products are stored or placed must be dry, have adequate moisture-proof measures, and avoid being placed at the high humidity or at the foot of the concrete wall.

Because the electrostatic effect of electronic products is easy to absorb dust, which causes the insulation of electronic components to decrease and the temperature to rise, electronic products must be cleaned and dusted frequently.

Oxidation, rust, and electrical resistance of metal parts of electronic components in contact with air can cause poor contact and noise. Protect rusted metal or welded areas with enamel. In addition, the acidic flux used in soldering will not corrode the metal part of the electronic component and will cause poor contact if it is not removed after use. Adequate anti-corrosion measures must be taken in locations with corrosive gases.

The environment where the equipment is located is prone to noise due to some kind of vibration or shock. For the installation or wiring of equipment components, there must be anti-shock and impact measures. Avoid sloppy and rough operation when using. Do not bump while handling.

2. Maintenance of electronic products noise

For the maintenance of electronic product noise, first determine whether the fault is repaired or improved according to the noise of the electronic product or the abnormal working condition, and then find out the cause based on the fault. Once the normal electronic products generate noise, this is a obvious failure and needs to be repaired. However, the electronic products that are put into use have noise at the beginning. It is related to the environment, the use conditions and the performance of the equipment. This is not a maintenance area but a significant improvement problem. Maintenance is to find out the cause of noise, "headache, foot pain, foot pain" even if the task is completed, it is relatively simple. The improvement is to solve the family problem of noise completely from head to toe, which is the key problem. There are various causes of noise in electronic products. Some noise is caused by only one cause, and some noise is caused by a mixture of multiple causes. According to the noise source of electronic products, noise can be divided into: internal noise and external noise.