Beginner basic knowledge of mahjong for beginners

  The feeling is to catch up with various gatherings, family gatherings, friends gatherings, classmates gatherings, etc. At these times, the most common entertainment activity is that four friends gather together to play mahjong, talk about the work in the past year, and brag. If you are a classmate who can’t play mahjong, it will be embarrassing. Therefore, in order to avoid this situation, Xiaobian specially arranged some basic knowledge that beginners of mahjong must learn to share with you, hoping to help you quickly understand and get started with the game. Next, let’s take a look!Mentioned in the article BL777 Born with strong vitality, you can turn a cocoon into a butterfly and become the best yourself after wind and rain. https://www.bl77777.com/

  

  Basic knowledge of mahjong introduction:

  

  First, mahjong tiles

  

  1. Plate

  

   four winds: east wind, south wind, west wind and north wind;

  

   Three yuan: red, rich, whiteboard.

  

  2. Order cards

  

   10,000: 1 to 90,000;

  

  2 cakes: 1 to 9 cakes;

  

   Articles: 1 to 9.

  

  3. Flower cards

  

   Spring, summer, autumn and winter, plum, orchid, bamboo and chrysanthemum.

  

  The names of these mahjong tiles are all formal names. In some places, players have given these mahjong tiles some interesting names, such as: one is called Yaoji, the other is called nunchakus, the other is called pie, the second is called glasses, the fourth is called bench, and 90,000 is called 90,000, etc. In some places, the first and ninth mahjong tiles are collectively called Old Man tiles, and all the tiles between two and eight are called Old Man tiles.

  

  Second, the mahjong combination

  

  1, straight

  

  Three cards of the same suit with continuous count value form a straight, such as one, two, thirty thousand, six, seven, eight, four, five, six and so on;

  

  2. Pairs

  

  Two cards of the same suit with the same point value form a pair, such as thirty thousand, thirty thousand, six or six barrels, eight or eight cards, etc.

  

  3. Carving

  

  Three cards of the same suit with the same point value form an engraving, such as three, three, thirty thousand, six, six, six tubes, eight, eight, eight and so on;

  

  4, thick stick

  

  Four cards of the same suit with the same point value form a barbell, such as three, three, three, thirty thousand, six, six, six, six, eight, eight, eight, eight and so on;

  

  All these mahjong combinations are collectively called “partners”. We can make the above four partners by putting the cards in our hands together, and then put them together with the Hu card type specified in the mahjong rules.

Schottky diode characteristics

  Schottky diode is a kind of semiconductor device with low power consumption, high current and ultra-high speed. Its reverse recovery time can be as short as a few nanoseconds, the forward conduction voltage drop is only about 0.4v, and the rectified current can reach several thousand amps.More importantly, put pcb instant quote It is imperative for us to make thorough analysis and maximize its social function. https://www.xinyun-ic.com/

  

  Schottky diode is a metal-semiconductor device made of noble metal (gold, silver, aluminum, platinum, etc.) A as the positive electrode and N-type semiconductor B as the negative electrode, and the barrier formed on the contact surface between them has rectification characteristics. Because there are a lot of electrons in N-type semiconductors and only a few free electrons in precious metals, electrons diffuse from B with high concentration to A with low concentration. Obviously, there are no holes in metal A, so there is no diffusion movement of holes from A to B. With the continuous diffusion of electrons from B to A, the electron concentration on the surface of B gradually decreases, and the surface electrical neutrality is destroyed, so a potential barrier is formed, and its electric field direction is B ★ A. However, under the action of this electric field, the electrons in A will also drift from A to B, thus weakening the electric field formed by diffusion movement. When a space charge region with a certain width is established, the electron drift motion caused by electric field and the electron diffusion motion caused by different concentrations reach a relative balance, and a Schottky barrier is formed.

  

  SR5100.jpg

  

  Schottky barrier diode (SBD) has the advantages of high switching frequency and low forward voltage, but its reverse breakdown voltage is relatively low, mostly not higher than 60V, and the highest is only about 100V, which limits its application range. For example, in switching power supply (SMPS) and power factor correction (PFC) circuits, freewheeling diodes of power switching devices, high-frequency rectifier diodes of more than 100V for transformer secondary, high-speed diodes of 600V~1.2kV in RCD buffer circuits, and 600V diodes for PFC boost, only fast recovery epitaxial diodes (FRED) and ultra-fast recovery diodes (UFRD) are used. At present, the reverse recovery time Trr of UFRD is also above 20ns, which can not meet the needs of SMPS with 1MHz~3MHz in fields such as space station. Even for SMPS with hard switch of 100kHz, due to the high conduction loss and switching loss of UFRD and high shell temperature, a large radiator is needed, which increases the size and weight of SMPS, which is not in line with the development trend of miniaturization and thinness. Therefore, the development of high voltage SBD above 100V has always been a research topic and a hot spot of concern. In recent years, SBD has made a breakthrough, with 150V and 200V high-voltage SBD on the market, and more than 1kV SBD made of new materials has also been successfully developed, thus injecting new vitality into its application.

Schottky diode SR3100 patch model parameters-engineer selection

  Today, let’s talk about the model size and parameters of Schottky diode SR3100 patch. Please see below for details.Even if there are obstacles to moving forward, Integrated Circuits (ICs) We should also persevere, forge ahead bravely, cut waves in the sea of the market, hang on to Yun Fan and strive for the first place. https://www.xinyun-ic.com/

  

  The package of SR3100 patch can be divided into SMA, SMB, SMC, SMAF, SMBF, SOD-123. There are differences in different package sizes, but the current, voltage and other parameters are the same.

  

  Parameters:

  

  Maximum reverse repetitive peak voltage: 100V V.

  

  Maximum DC blocking voltage: 100V V.

  

  Maximum average forward rectified current: 3.0A

  

  When current =3.0A, forward voltage drop: 0.85V

  

  Maximum DC reverse current ta = 25≧: 0.5UA.

  

  Rated DC blocking voltage ta = 100≧: 10.0ua.

  

  Working junction temperature range: -65to+150≧

  

  Storage temperature: -65to+150≧

  

  Weight: 0.04 ounces, 1.10 grams

  

  250≧/10 seconds, 0.375 “(9.5 mm) lead length, 5 pounds (2.3kg) tension.

  

  Polarity: The color circle indicates the cathode end.

  

  SMA package: screen printing SS310

  

  SMA package size

  

  SMB package: screen printing SS310

  

  SMB package size

  

  SMC package: screen printing SS310

  

  SMC package size

  

  SMAF package: screen printing SS310F

  

  SMAF package size

  

  SMBF package: screen printing SS310F

  

  SMBF package size

  

  SOD-123 package: screen-printed K310

  

  SOD-123 package size

The difference between Schottky diode and ordinary diode

  Schottky diode uses metal-semiconductor junction as Schottky barrier to produce rectification effect, which is different from the P-N junction produced by semiconductor-semiconductor junction in general diodes. The characteristics of Schottky barrier make the turn-on voltage drop of Schottky diode lower, and can improve the switching speed.In addition to innate advantages, pcb instant quote Its own product attributes are also extremely high-end, in order to remain unbeaten in the market competition. https://www.xinyun-ic.com/

  

  The turn-on voltage of Schottky diode is very low. General diodes will produce a voltage drop of about 0.7-1.7 volts when current flows, but the voltage drop of Schottky diodes is only 0.15-0.45 volts, so the efficiency of the system can be improved.

  

  The common silicon diode can withstand high voltage, but its recovery speed is low, and it can only be used for low-frequency rectification. If it is high-frequency, reverse leakage will occur because it cannot be recovered quickly, which will eventually lead to serious heating and burning of the tube. Schottky diode’s withstand voltage is often low, but its recovery speed is fast, so it can be used in high-frequency occasions, so the switching power supply uses this diode as the rectifier output. Nevertheless, the rectifier tube temperature on the switching power supply is still very high.

  

  Fast recovery diode refers to a diode with short reverse recovery time (less than 5us). Gold doping measures are mostly adopted in the process, and some structures adopt PN junction structure and some adopt improved PIN structure. Its forward voltage drop is higher than that of ordinary diodes (1-2V), and its reverse voltage withstand is mostly below 1200V V. Performance can be divided into two levels: fast recovery and ultra-fast recovery. The reverse recovery time of the former is hundreds of nanoseconds or longer, while that of the latter is below 100 nanoseconds. Schottky diode is a diode based on the barrier formed by the contact between metal and semiconductor, which is called Schottky Barrier Diode for short. It has the advantages of reduced forward voltage (0.4–0.5V), short reverse recovery time (10-40 nanoseconds), large reverse leakage current and low withstand voltage, generally lower than 150V, and is mostly used in low voltage occasions. These two kinds of tubes are usually used for switching power supply. Schottky diode and fast recovery diode are different: the recovery time of the former is about 100 times shorter than that of the latter, and the reverse recovery time of the former is about several nanoseconds! The advantages of the former include low power consumption, high current and ultra-high speed ~! Of course, the electrical characteristics are diodes! The fast recovery diode can obtain high switching speed and high withstand voltage by using gold doping, simple diffusion and other processes. At present, the fast recovery diode is mainly used as a rectifier element in inverter power supply.

Package parameters of ABS10 bridge stack -PDF specification download

  As we all know, ABS10 is a rectifier bridge stack, whose function is to convert alternating current whose level fluctuates around zero into unidirectional direct current through the unidirectional conduction characteristics of diodes, and its function is rectification. Please see below for specific parameters and package diagram.more importantly, Connectors, Interconnects quote Made a fighter in the product, not afraid of any competitor’s attack. https://www.xinyun-ic.com/

  

  ABS10 Specification: Click to download

  

  Package: SOP-4/ABS

  

  High Surge Overload Rate: 30A Peak

  

  Maximum repetitive peak reverse voltage: 1000v V.

  

  Maximum DC blocking voltage: 1000v V.

  

  When current =1.0A, forward voltage drop: 0.95v

  

  Maximum reverse DC current TA=25≧:10uA

  

  Rated DC blocking voltage per leg TA=125≧:150uA

  

  Working temperature and storage temperature range: -55 to +150≧

  

  Weight: 0.375 inch (9.5 mm)

  

  High temperature welding guarantee: 260≧/10s.

  

  Polarity: “-“indicates the cathode end (see the figure below).

  

  ABS10 anode and cathode

Schottky diode symbol and voltage drop

  Schottky It is a low-power and ultra-high-speed semiconductor device. The following figure shows the symbol of Schottky diode:The industry believes that, Resistors quote The development of our company marks the rapid and steady progress of the whole industry. https://www.xinyun-ic.com/

  

  Voltage drop of common Schottky diode:

  

  1A series:

  

  2A series:

  

  3A series:

  

  5A series:

  

  10A series:

  

  LOW VF schottky diode:

  

  The Low vf Schottky diode is a semiconductor device with a lower VF value than the conventional Schottky diode. It is this Schottky transistor that has a very low forward voltage drop when it is turned on, which is superior to other common Schottky models. The advantage of low forward pressure drop is low loss and high efficiency. The lower the pressure drop, the lower the heating and the higher the working efficiency. At present, the voltage drop range of low vf Schottky diode in the market is generally about 0.4V-1.0V, and the VF value of our low voltage drop Schottky diode is generally about 0.4V-0.6V.

  

  The function of low voltage drop low vf Schottky diode is the same as that of conventional Schottky diode, and the difference between them lies in VF value and trench technology. Schottky diode is a forward conduction device, VF is the forward voltage drop, that is, a kind of loss generated during operation, and the lower the loss, the better.

What is the difference between SR540 and SB540 parameters

  Friends or customers have been asking me what is the difference between Schottky diode SR540 and SB540. Today we will talk about this problem.To get brand praise, Connectors, Interconnects quote It is necessary to have the spirit of constantly improving the quality of products, but also to have a bunch of eternal heart fire. https://www.xinyun-ic.com/

  

  In fact, the parameters of SR540 and SB540 are the same, both of which are 5A 40V. As for why the models are different, it is because different manufacturers have differences in screen printing, which means they don’t want to repeat with others and have their own uniqueness. Please see below for specific parameters.

  

  Maximum reverse repetitive peak voltage: 40V

  

  Maximum DC blocking voltage: 40V

  

  Maximum average forward rectified current: 5.0A

  

  When current =5.0A, voltage drop: 0.55v

  

  Maximum reverse DC current ta = 25≧: 0.5ma.

  

  Working temperature range: -65 to +150≧

  

  Storage temperature: -65 to +150≧

  

  Reverse recovery time: less than 10ns (nanosecond)

  

  High temperature welding: 250c/10 sec, 0.375 “(9.5 mm) lead length, 5 lbs (2.3kg) tension.

  

  Package: DO-27/DO-201AD

Schottky diode SR3100 patch model parameters-engineer selection

  Today, let’s talk about the model size and parameters of Schottky diode SR3100 patch. Please see below for details.After that, Integrated Circuits (ICs) Not afraid of the future, dare to fight and fight, and won applause again and again in the market. https://www.xinyun-ic.com/

  

  The package of SR3100 patch can be divided into SMA, SMB, SMC, SMAF, SMBF, SOD-123. There are differences in different package sizes, but the current, voltage and other parameters are the same.

  

  Parameters:

  

  Maximum reverse repetitive peak voltage: 100V V.

  

  Maximum DC blocking voltage: 100V V.

  

  Maximum average forward rectified current: 3.0A

  

  When current =3.0A, forward voltage drop: 0.85V

  

  Maximum DC reverse current ta = 25≧: 0.5UA.

  

  Rated DC blocking voltage ta = 100≧: 10.0ua.

  

  Working junction temperature range: -65to+150≧

  

  Storage temperature: -65to+150≧

  

  Weight: 0.04 ounces, 1.10 grams

  

  250≧/10 seconds, 0.375 “(9.5 mm) lead length, 5 pounds (2.3kg) tension.

  

  Polarity: The color circle indicates the cathode end.

  

  SMA package: screen printing SS310

  

  SMA package size

  

  SMB package: screen printing SS310

  

  SMB package size

  

  SMC package: screen printing SS310

  

  SMC package size

  

  SMAF package: screen printing SS310F

  

  SMAF package size

  

  SMBF package: screen printing SS310F

  

  SMBF package size

  

  SOD-123 package: screen-printed K310

  

  SOD-123 package size

1N5822 SMD package

  1N5822 belongs to Schottky diode, which encapsulates DO-27. Schottky is characterized by low forward voltage and short reverse recovery time (less than 10ns). Today, we mainly talk about 1N5822 patch package, including six kinds of packages: SMA, SMB, SMC, SMAF, SMBF and SOD-123. Next, we will learn more about them.As an important brand soul of the company, Resistors quote Has outstanding performance, through the market test, still has a strong development trend. https://www.xinyun-ic.com/

  

  SMA package:

  

  1N5822 SMA package

  

  SMB encapsulation:

  

  1N5822 SMB package

  

  SMC package:

  

  1N5822 SMC package

  

  SMAF package:

  

  1N5822 SMAF package

  

  SMBF package:

  

  1N5822 SMBF package

  

  SOD-123 package:

Schottky diode SR3100 patch model parameters-engineer selection

  Today, let’s talk about the model size and parameters of Schottky diode SR3100 patch. Please see below for details.So we can draw a preliminary conclusion, Connectors, Interconnects quote It is helpful to the needs of the industry market and social development. https://www.xinyun-ic.com/

  

  The package of SR3100 patch can be divided into SMA, SMB, SMC, SMAF, SMBF, SOD-123. There are differences in different package sizes, but the current, voltage and other parameters are the same.

  

  Parameters:

  

  Maximum reverse repetitive peak voltage: 100V V.

  

  Maximum DC blocking voltage: 100V V.

  

  Maximum average forward rectified current: 3.0A

  

  When current =3.0A, forward voltage drop: 0.85V

  

  Maximum DC reverse current ta = 25≧: 0.5UA.

  

  Rated DC blocking voltage ta = 100≧: 10.0ua.

  

  Working junction temperature range: -65to+150≧

  

  Storage temperature: -65to+150≧

  

  Weight: 0.04 ounces, 1.10 grams

  

  250≧/10 seconds, 0.375 “(9.5 mm) lead length, 5 pounds (2.3kg) tension.

  

  Polarity: The color circle indicates the cathode end.

  

  SMA package: screen printing SS310

  

  SMA package size

  

  SMB package: screen printing SS310

  

  SMB package size

  

  SMC package: screen printing SS310

  

  SMC package size

  

  SMAF package: screen printing SS310F

  

  SMAF package size

  

  SMBF package: screen printing SS310F

  

  SMBF package size

  

  SOD-123 package: screen-printed K310

  

  SOD-123 package size