What You Need to Know About Keyboard Mouse

The introduction of set keyboard mouse pcWhen you're done, please let me know what you think about this article. The first draft focuses on 'The introduction of set keyboard mouse pc' could look like this 'When you're done, please let me know what you think about this article. The first draft focuses on 'The introduction of set keyboard mouse pc' could look like this 'When you're done, please let me know what you think about this article. The first draft focuses on 'The introduction of set keyboard mouse pc' could look like this 'When you're done, please let me know what you think about this article.Most of the time it is difficult to understand what a pc is. A pc is a computer system that has some form of keyboard, monitor, and printer. Computer systems are small computers that have many computers connected to them. Computers are typically made of metal and glass and usually contain at least two processors, hard drives, and networking software. They also have other parts that make them different from any computer system that you can find in the market today. Computer systems are usually complex computers that use several processors, memory, networking software, storage, graphics, video, audio, and many more.There are lots of laptop computers that have an adjustable keyboard and mouse. The laptops that have keyboards and mice are great for making notes, or doing simple things like typing on a PC. A good laptop computer will also have plenty of space for you to type on it. A good laptop computer will also have a number of ports so that you can connect to other computers and use them to make phone calls, send email, or do many other things that you would be able to do on a PC.When you get tired of using a mouse, it is best to use a keyboard. The keyboards work better than the mouse because they allow you to move your cursor over the screen more easily. With a keyboard, you can also type in more smoothly. This means that you will be able to use your mouse more efficiently.Tips for choosing set keyboard mouse pcWe have seen how to use set keyboard mouse pc and we are using it now. If you want to know how to use set keyboard mouse pc, we suggest you read this article. Set keyboard mouse pc is a tool that allows you to create an intuitive interface for your computer by setting up a keyboard and mouse together. Set keyboard mouse pc allows you to control your computer by using the mouse and keyboard together. It is easy to use and doesn't take up much space on your computer. Set keyboard mouse pc allows you to have access to all the functions of your computer at the same time.This post is about some important things that people should know about using set keyboard mouse pc. It is very important to understand that set keyboard mouse pc is not just a tool that can be used to change the appearance of the screen but also a means to control the way the screen looks. People who use set keyboard mouse pc will need to know how to use it properly so that they can get the most out of it. A good way to learn how to use set keyboard mouse pc is to read through this post.If you want to buy the best laptop then it is important to be aware of the right kind of laptop that you can buy. If you are buying a laptop then it is important to be aware of the right kind of laptop that you can buy. It is important to be aware of the right kind of laptop that you can buy. It is important to be aware of the right kind of laptop that you can buy. It is important to be aware of the right kind of laptop that you can buy. It is important to be aware of the right kind of laptop that you can buy.How to use set keyboard mouse pc?Most of the time when I work on the computer, I have to press the key combinations that I need to be able to make changes to the screen. When I press the key combinations that I need to be able to make changes to the screen, I sometimes get stuck and don't know how to proceed. The most common mistake that people make when working on the computer is not pressing the right key combinations at the right time. This can be very frustrating and sometimes it's better to just quit working on the computer.When you have an idea that you are going to write a blog titled 'How to use set keyboard mouse pc?' then it is very important to know how to use set keyboard mouse pc. For example, you can put your mouse in the top right corner of the screen and move your mouse around the screen, so that you can get a better idea of what you are going to write. If you don't know how to use set keyboard mouse pc, then it is very important to know how to use set keyboard mouse pc.The way to make a good quality wordpress website is to have a site that looks great. If you are not going to be creating content for your site, it is better to use a free theme. I would recommend using the Free Ghost template because it is simple and clean. The design of the theme is very clean and elegant. It has all the features that you need to create a professional website.As soon as you have finished reading this, you will know how to use set keyboard mouse pc. It is really simple to use set keyboard mouse pc. Just read through the instructions carefully and follow them step by step. Set keyboard mouse pc is really easy to use. The keyboard can be operated by using two fingers. So, it is very easy to use set keyboard mouse pc. If you want to learn how to use set keyboard mouse pc, just read through the instructions carefully.The specifications of set keyboard mouse pcThere are several aspects that affect the success of computer software. For example, when you need to put together a new program, it is best to make sure that it is compatible with the operating system that you have already installed. It is best to use the most recent version of the operating system that you have installed. This will ensure that you can get the most out of your computer software.If you want to learn how to use set keyboard mouse pc, then you need to know how to use set keyboard mouse pc. This article will teach you how to use set keyboard mouse pc. So if you want to learn how to use set keyboard mouse pc, then you need to know how to use set keyboard mouse pc. So if you want to learn how to use set keyboard mouse pc, then you need to know how to use set keyboard mouse pc. So if you want to learn how to use set keyboard mouse pc, then you need to know how to use set keyboard mouse pc.If you are looking for a computer mouse that is easy to use and offers plenty of power, then the Microsoft Numba will be a good choice for you. This is because it is an extremely powerful desktop computer mouse that has features that will make your work easier. It also has many features that will make your life easier and more comfortable. You can choose between two models of this mouse: the M11 and the M11T.It is important to be able to use your computer as well as laptop in a safe way. The keyboard and mouse are both extremely dangerous when you use them together. When you use your computer or laptop for work, it is very important to be able to take good care of them. It is also important to be able to take good care of your computer and laptop so that they don't get damaged.The application of set keyboard mouse pcUsing set keyboard mouse pc is very easy. You just need to use set keyboard mouse pc to change the color of the text and it will work as well as if you are using set keyboard mouse pc to write or add some pictures to the text. Set keyboard mouse pc is a powerful tool that will help you to create beautiful and eye-catching content that will attract your visitors. It is easy to use and simple to use.When you have been using a computer for years, it is quite easy to become lazy. You might even feel that you have forgotten how to use it. It is possible to make use of the keyboard to your advantage by taking advantage of its rich functions. When you have been using a computer for years, it is quite easy to become lazy. You might even feel that you have forgotten how to use it. It is possible to make use of the keyboard to your advantage by taking advantage of its rich functions. When you have been using a computer for years, it is quite easy to become lazy.I want to be able to use the keyboard and mouse together. It is not an essential skill, but it is something that I would like to have. The problem is that it is hard to learn and sometimes I do not know how to use the keyboard and mouse together. So, what can I do to improve my skills?In my opinion, it is not an improvement over the old system, but it is an improvement over the old system. I am using a PC with keyboard and mouse. The main problem with the old system was that it was slow and sometimes you would have to use a lot of energy to move the mouse and control the computer. It was also difficult to write in a simple way and keep it easy to understand. With the new system, you can do anything you want and have more freedom to do it. You can type as much as you want and write as much as you want.

Introduction to gaming keyboard mouse headsetSome games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user. Some games require input from the user.The problem with using a gaming headset is that it can be uncomfortable. For some people it is difficult to sit down in a chair and not feel as if they are sitting in a bubble.Just because the keyboard is designed to write with, doesn't mean it's going to be easy to use. I'll go into more detail about how to use a gaming keyboard mouse headset in a future blog titled 'Gaming keyboard mouse headset can make your computer do more than just type. A gaming keyboard mouse headset is a piece of equipment that provides you with the ability to control your computer's input and output via a keyboard and mouse.One of the main reasons why I've chosen to use the best gaming keyboard mouse headset is because it's very comfortable and doesn't have any bad habits. Gaming keyboards are usually equipped with something like dual noise canceling, so that they don't make too much noise when playing games. If you're looking for a gaming keyboard mouse headset, then it's important to choose a headset that will give you the best sound quality possible. There are several types of gaming keyboards available today, and each type has its own unique features. A gaming keyboard is one of the most used tools in the world of computer games.First impression and using experience of gaming keyboard mouse headsetOne click on the mouse is good. The same goes for games that use the same hardware, so you don't have to be super careful when playing a game. It is easy to make mistakes when playing a game and it is better to learn from them. You can also use your imagination to come up with ideas for things that you may not be able to do in real life. Games are very fun and if you are looking for something fun to do with your friends then try playing a game.If you have a lot of time to spend playing games, it is good to learn how to use the keyboard and mouse so that you can enjoy playing games more. You can use this knowledge to learn how to use the game console so that you can enjoy playing games more. First impression and using experience of gaming keyboard mouse headset is an interesting topic that people will want to learn more about. So if you want to learn more about it, go to the link below.When you are used to using a gaming keyboard mouse headset, the keyboard doesn't seem to respond as well as it used to. First impression and using experience of gaming keyboard mouse headset may help you understand how to use a gaming keyboard mouse headset properly. It is also good to know that if you are not satisfied with the performance of a gaming keyboard mouse headset, you can change it.If you have not tried the headset before, it is best to try it first. A good headset will give you a better feeling when you are playing. And if you have used the headset before, it will be easier to use. Try to make sure that you have found the right headset for you. If you are looking for a good headset, then the first step is to choose the right headset. The headset should be comfortable and easy to use. You should also find out how to use the headset well. If you need to learn how to use the headset well, then you should read through the user manual.Pros and cons of gaming keyboard mouse headsetIf you're playing a game with keyboards and mice, then it's easy to get confused about what they do and how they work. It's very important to have an overview of the main functions of each function so that you can use them effectively. In this article, we'll be looking at the basics of gaming keyboards and mouse headset so that you can be able to make sure that you have a good experience with them. For more information about gaming keyboards and mouse headset, check out our article on gaming keyboards and mouse headset.When playing games with the headset, it is very important to keep the headset quiet. It is also important to use a headset that has an operating button that will stop the sound from being heard. When using a headset, it is very important to keep the headset quiet. It is also important to use a headset that has an operating button that will stop the sound from being heard. When using a headset, it is very important to keep the headset quiet. It is also important to use a headset that has an operating button that will stop the sound from being heard.Some people think that gaming headset is really useful for computer games. When they try to use it, they will feel tired and don't want to use it. The problem is that people who are using it do not understand how to use it properly. I will explain the problems and what can be done to improve the quality of gaming headset.A paragraph for a blog titled 'Pros and cons of gaming keyboard mouse headset' where the section focuses on 'Pros and cons of gaming keyboard mouse headset' could look like this 'A good gaming headset is an essential part of any computer or game console. Without a gaming headset, it is very difficult to use the games you love. When using a gaming headset, you can focus on what you are doing and not be distracted by anything else. If you are looking for a gaming headset, there are many different types of gaming headsets that you can choose from.Overall evaluation of gaming keyboard mouse headsetMost people will say that gaming keyboards are just fun and they don't really change the way people play. But what if we tell them that gaming keyboards change the way people play? People who play games with keyboards can feel more comfortable, faster and also get more done in a single session. If we give them a good gaming keyboard, they will feel better about playing and working together.One thing that makes gaming keyboards very useful is that they allow you to control your computer and play different games without using any real physical keyboard or mouse. It is really easy to use and requires no special skills. If you are looking for a new game, then you can always buy a game console and try it out on your computer. There are many games that you can play with a gaming keyboard.Withdraw from the situation with a game console and get back to work. I will try to keep you updated on what is going on with the world of technology. The problem with technology is that it does not give us enough time to do things properly. A good way to learn about technology is to look at how it works. You will learn how to use it, and then you will be able to use it better. If you are using a PC or console, then you will be able to use it more efficiently. It is important to know how to use the computer so that you can use it more efficiently.Most people don't think about it, but when you are using a gaming keyboard mouse headset, it is easy to get distracted. The most important thing is to make sure that you use a gaming keyboard mouse headset in a comfortable environment. A gaming keyboard mouse headset will help you keep your concentration and also improve your typing skills. It will be better if you use a gaming keyboard mouse headset to work on your word processing and writing tasks.

The introduction of keyboard mouse headsetMost of the time it is difficult to make good use of the mouse and other technology. The key to success is to be creative and find ways to use the technology that you already have. As long as you are able to put it to good use, you will succeed.Some more good books on the pc than about the pc, especially if you are interested in learning how to use the pc. A lot of people think that they can use the pc as a great tool to learn how to use the pc. It is true that it is easy to use the pc as a tool to learn how to use the pc. It is also true that there are some very good books on the pc that will teach you how to use the pc. There are also some very good books on the pc that will teach you how to use the pc.It is necessary to know that a computer is more powerful than a smartphone. And it is also necessary to know that a computer is more powerful than a smartphone. And it is also necessary to know that a computer is more powerful than a smartphone. And it is also necessary to know that a computer is more powerful than a smartphone. And it is also necessary to know that a computer is more powerful than a smartphone. And it is also necessary to know that a computer is more powerful than a smartphone. And it is also necessary to know that a computer is more powerful than a smartphone.There are so many problems with keyboards and mice. The computer is an important tool for the workplace. If you don't use it well, it can make your life difficult. And if you don't use it well, it can make your life difficult. There are so many problems with keyboards and mice. The computer is an important tool for the workplace. If you don't use it well, it can make your life difficult. And if you don't use it well, it can make your life difficult. So let's take a look at some of the problems with keyboards and mice.The specifications of keyboard mouse headsetWe have to give up on using our laptops because of the difficulty of using them. A laptop is just a notebook that has some apps installed. There are so many apps that we use on our laptops that we never think about how they affect our lives. If we want to use a laptop, we need to be able to control it and use it in a good way. The first step is to make sure that the software we use is compatible with the laptop. For example, if we use the same software for both computers, we will have to make sure that the software is compatible with the laptop.In many cases, people do not know how to use a mouse or keyboard. When they do, they use the mouse and press the same keys over and over again. The key is located on the bottom of the keyboard and it can be pressed in several ways. In order to make the key easy to use, you need to learn how to use the mouse and press the same key over and over again. If you are someone who likes to use the mouse and press the same key over and over again, you need to learn how to use the mouse and press the same key over and over again.With good software, you can create an icon that will change the sound quality of your computer. The problem is that it doesn't work. If you have a large screen, it's difficult to put the sound in the most comfortable way. But what if you don't have a large screen? I'm sorry, but it's impossible to put the sound in the most comfortable way. It's very hard to put the sound in the most comfortable way. And if you don't have a large screen, it's difficult to put the sound in the most comfortable way.Related popular brands in the keyboard mouse headset industryWe are using our spare time to create more products and we will always keep you updated on what we are doing. When you need to use a product, it is very important to get it fast. The first step is to choose the right device and make sure that it is compatible with your computer. It is not a good idea to use a product that is not compatible with your computer.Most popular brands in the keyboard mouse headset industry is not always easy to find. The difficulty of finding these brands is due to the high amount of information that we have about them. As such, there are some brands that are only known to us by their images and products. It is impossible to know if a brand is still available or if it is already obsolete. For this reason, we need to make sure that we can get enough information about these brands so that we can determine if they are still available.I have been searching for something similar to this and it doesn't exist. For example, it would be hard to find something similar to this. And if you need to find something similar to this, there are many companies that produce these products. But what about other brands that produce these products? It is important to note that if you are looking for something similar to this, there are many companies that produce these products. But what about other brands that produce these products? It is important to note that if you are looking for something similar to this, there are many companies that produce these products.If you want to learn more about this topic, go to the most popular brands in the keyboard mouse headset industry.Most popular brands in the keyboard mouse headset industry are listed in order of popularity. In order to make it easier to find products that are similar to these brands, we have included them in this list. If you want to see more brands that are similar to these brands, please use the search function on the left.The benefits of keyboard mouse headsetIt is easy to find something that is really good. You just have to be careful about what you put in your mouth. If you want to buy something, then you should read through the reviews and compare it with other products. This will make you more aware of what you are buying. The key is to choose the product that will suit your needs.There are so many reasons why people use keyboards and mice. I'm sure you can think of more than one. And when you have to write a blog titled 'The benefits of keyboard mouse headset' you need to make sure that you choose the best keywords for your blog. You need to choose the best keywords for your blog.While using a keyboard mouse headset is good for those who are nervous or have problems with writing, but there are also some drawbacks. For example, if you are tired of using a mouse and need to write quickly, it is not a good idea to use a keyboard mouse headset. The downside to using a keyboard mouse headset is that it can make you uncomfortable and may also affect your posture. It is better to use a headset that has built-in speech recognition software so that you can easily type in your content.We know that there are so many more features in the product that we use every day. If you want to make your life easier, then we recommend that you read through the list of features and if you don't find anything that you like, then go back to the search bar and see what other products that you have in your cart.It is the biggest advantage of using a keyboard mouse headset is that it allows you to use your laptop or computer in a comfortable and natural way. If you have to move your hands around the keyboard, you will be more relaxed and more productive. Also, when you use a keyboard mouse headset, you will be able to get more done in a shorter time. With a keyboard mouse headset, you will be able to get more done in a shorter time.

The introduction of keyboard mouse setWhen you are bored with your laptop or pc, then it is very easy to use the mouse and press the key to start playing a game. You can also play an interactive storybook on the computer and switch to a different screen with the mouse. This means that you can do anything you want on the computer without being distracted by anything else. When you use the mouse, you can move around the screen and move around the world in an interactive way. You can also use the mouse to control your phone or PC.In order to have a good gaming experience, the input device that we use for input needs to be comfortable. The gaming experience should be as smooth as possible. If the input device is uncomfortable, it will affect the gaming experience. So, when we use a gaming device, we should not only focus on the gaming experience, but also on the comfort of the device. In order to achieve this, we should try to buy a gaming device that is comfortable.There are many advantages of using keyboard mouse set is a great tool for making writing easier. However, there are also many disadvantages of using keyboard mouse set. In order to understand the drawbacks of using keyboard mouse set, we should be familiar with the main features of keyboard mouse set. It is important to understand that there are two main features of keyboard mouse set. The main feature of keyboard mouse set is that it has an electronic keyboard and it also has a numeric keypad. In order to understand the main features of keyboard mouse set, we should be familiar with the basic functions of keyboard mouse set.If you are interested in learning how to use the mouse and want to be able to use it more effectively, there are many ways to do this. If you want to learn how to use the mouse, then there are many ways to do this. There are many ways to learn how to use the mouse. The most common way to learn how to use the mouse is to learn how to use the mouse properly. It is a skill that takes time to learn. It is a skill that takes time to learn.The specifications of keyboard mouse setSomewhere in the world there is a notebook computer with an extra mouse. A laptop computer has no more than two mice, and a tablet computer has no more than one mouse. When you are working on a piece of work, you will have to write down what you need to do and put it in the notebook computer.As long as you have been playing games, the best thing about gaming is that you can use your imagination. Gaming is an amazing game and it's great to be able to use your imagination. It's fun to create new worlds and characters and try out new ideas. Games are fun because they are full of creativity and excitement. When you play a game, you don't just have to get back to the controls and do what you need to do. You can also change the sounds and actions that you do.I don't think that there is any way to put an opinion on the problem of using keyboards and mice in a negative way. I think that the majority of people who use keyboards and mice do so in a positive way. When you use a keyboard and mouse, you are working with computers that have software programs that can help you make better decisions. If you use a keyboard and mouse, you are working with computers that have software programs that can help you make better decisions. You need to be able to understand how to use the software programs so that you can use them in a good way.When you use a mouse, the keys are arranged in such a way that they make it easier to write down what you want to say. In order to be able to type quickly, you have to use your brain. For example, when you are typing, you need to think about what you want to say and how you want to say it. When you use a mouse, you can focus on the key that you want to press and get back to your task.Related popular brands in the keyboard mouse set industryIn today's market, there are many products that people use to control their computers. There are also many products that people use to control their mobile phones. If you want to learn more about these products, you can read about them in the industry's official website. The key to getting good information about these products is to understand how they work. In order to get good information about these products, you need to know how they work. This article will give you some important information about how these products work.The trend is changing. The situation is getting worse. People are moving away from traditional products and prefer to use digital products. This trend is becoming more and more popular and will continue to increase in the future. It is very important to use digital products that are compatible with most modern mobile devices. If you want to be successful in the market, you need to be innovative and create new products that will help you make money.While it is possible to make an efficient choice of keyboard mouse set industries, there are many things that need to be considered when choosing a keyboard mouse set industry. Some of the important factors that need to be considered when choosing a keyboard mouse set industry are as follows: The type of keyboard mouse set industry that you are looking for. You need to know what kind of keyboard mouse set industry that you are looking for. It is also important to know what kind of keyboard mouse set industry that you are looking for. You need to know what kind of keyboard mouse set industry that you are looking for.When I look at the top 10 most popular brands in the keyboard mouse set industry, I find that there are so many different types of keyboards and mice. The good news is that there are some very common features that people will find very useful. For example, if you have a child who is an avid gamer, then you will be able to buy a gaming keyboard and mouse that will allow you to play your favorite games with ease.The benefits of keyboard mouse setWhen you want to be successful in life, it is important to understand how to use the keyboard. A good writer will be able to write a good piece of writing that will help you get more done in life. It is important to know how to use the keyboard so that you can write better. If you are going to use the keyboard, it is important to know how to use it so that you can get more done in life.There are some very good reasons why people use keyboards and mice. When you are using a keyboard and mouse it is easy to get distracted. A good way to keep your concentration is to write down all the things you do in a particular task. If you have something to do, then just focus on it. So, when you use a keyboard and mouse it is easy to get distracted. A good way to keep your concentration is to write down all the things you do in a particular task. If you have something to do, then just focus on it.People think they know what it means to have a bad back. The problem is that there are no good answers to the problem. A good answer is that people don't know what it means to have a bad back. So if you want to know what it means to have a bad back, then go back to the top of the page and look for the line for "The Benefits of Keyboard Mouse Set." If you don't know what it means to have a bad back, then you need to learn how to use a keyboard.I really don't know what to say about this, it is hard to put into words. But I am going to say that it is an idea that has been around for years. It is something that many people have done before and it works very well. If you want to try it out you can use a PC or laptop with an online gaming software such as Notepad or Exe2 and then run the game in your computer or use the mouse and control the game using the keyboard.

The internal power supply of portable B-ultrasound system is complex. The power supply of external adapter and battery must be converted into the voltage required by the system through DC / DC conversion. In order to reduce the useless consumption of power supply and improve the battery efficiency, the power supply of system motherboard, B-ultrasound control board, LCD and keyboard is powered by switching power supply.Overall design of portable B-ultrasound power supplyFigure 1 is the overall design block diagram of portable B-ultrasound power supply. There are two kinds of power input voltage for portable B-ultrasound: one is the power adapter input, the voltage is 18V, and the other is the battery input, the voltage is 14.4V. It is required to realize the thermal switching between the two voltages, and the system operation will not be affected when switching the voltage, that is, it provides the function of external power supply and battery power supply without delay. It is required to output several voltages such as 12V, 5V, 3.3V and 48V. The specific indicators are 12V / 2.5A, - 12V / 0.5A, 5V / 4A, 3.3v/3a, 48V / 80mA and - 48V / 80mA. It has the function of single key on-off, that is, when there is no power, press the power key to turn on the power; When there is power, press the power key to send a shutdown signal to the control panel, and the upper computer can also shut down through software (i.e. support ATX shutdown command). The power output interface adopts standard computer ATX interface.Figure 1 overall design block diagram of portable B-ultrasound power supplyDesign of power switching circuitThe power switching circuit of portable B-ultrasound is shown in Figure 2. When the external power adapter is connected, the voltage is input to AC 18V, which is divided by VD100 and vd101 diodes, and then applied to pin 3 (in-phase terminal) of n100a (lm193) voltage comparator through R100 and R107. The input voltage of the battery is 14.4V, which is divided by R101 and r108 and added to pin 2 (inverting end) of n100a (lm193) voltage comparator. Since the voltage of pin 3 is higher than that of pin 2, pin 1 of n100a (lm193) outputs high level to turn on triode V100, turn off V101, turn off FET v105 and turn off power_ The in terminal gets the 18V voltage of the external power adapter. When there is no external power adapter, or when the portable B-ultrasound machine cannot use the external power adapter due to sudden power failure of external AC, the voltage of pin 3 of n100a (lm193) is lower than pin 2, and pin 1 of n100a (lm193) outputs low level, so that the triode V100 is off, V101 is on, and the FET v105 is on. The battery voltage passes through the source and drain of the conducting FET v105, power_ The in terminal obtains the 14.4V voltage of the battery, which realizes the thermal switching between the two voltages. Vd102 and vd103 play an isolation role in the circuit, isolating the external power adapter and battery power supply.Figure 2 power switching circuitDesign of single touch switch circuitThe circuit of portable B-ultrasound single touch switch is shown in Figure 3, which is powered by an external adapter or battery_ The in voltage is sent to the FET Q100 for startup, and the other is sent to one end of the touch button power-key2 through r104 and vd104. The other end of the tap button power-key2 is grounded. When the tap button power-key2 is pressed, the base of triode n106 is clamped at the low level, n106 is turned on, N102 is also turned on, FET Q100 is turned on, and power from external adapter or battery_ In voltage passes through the source and drain of Q100 to obtain power voltage to supply power to high and low voltage circuits, and the machine starts up. At the same time of startup, the power voltage passes through the 6V zener diode to turn on the triode n104, and the n104 collector is at the low level to maintain n106 on and maintain the startup state.Fig. 3 single touch switch circuitWhen the portable B-ultrasound machine is in the power on state and the button power-key2 is pressed again, the optocoupler B101 is turned on, the optocoupler secondary is turned on, the four pins of the inverter D101 output a low level to the control panel, and the control panel sends a low-level shutdown command power-off1 to turn on the optocoupler B100, then turn on the triode n103, turn off n104, and the high level of the n104 collector turns off n106, Led to the end of FET Q100 and realized shutdown.When the upper computer sends a high-level shutdown command power-off, it will also turn on the optocoupler B100. The rest process is the same as the shutdown process of the control panel.Design of low voltage power supply circuitThe portable B ultra-low voltage power supply circuit is shown in Figure 4, which is mainly composed of 6 tps5430 of TI company and 1 lm2576 of national semiconductor company. The six tps5430s provide two groups of 12V, 5V and 3.3V voltages, one of which is used to supply power to the main control board of the portable B-ultrasound machine, and the other is used to supply power to the computer in the portable B-ultrasound machine. The two groups are exactly the same, so we only give the power supply schematic diagram of one group. Lm2576 is responsible for generating - 12V voltage to the computer in portable B-ultrasound.Figure 4 low voltage power supply circuitTps5430 has a wide voltage input range of 5.5 36V, continuous 3A current output capacity (peak value of 4A) and conversion efficiency of 95%. 8-pin small patch package, the back of the chip is a metal heat sink, which must be welded to the ground when using. When making PCB package, the heat sink is regarded as the ninth pin. There is no need to connect the heat dissipation device, and good results can be achieved by using the heat dissipation of the circuit board itself, which is especially suitable for the design and use of portable products. Pin 1 of tps5430 is the boot end, which requires an indirect pH of 0.01 between the boot and pin 8 Low ESR capacitance of F. 2. Pin 3 is the empty terminal, and pin 4 VSENSE is the feedback voltage terminal of the regulator, which is connected to the voltage dividing resistance terminal of the output voltage to obtain the feedback of the output voltage. Pin 5 ENA is the power on / off control terminal. When the voltage of this pin is lower than 0.5V, the chip will turn off the power conversion and reduce the power supply current to 18 A. The chip works normally when it is suspended. We do not control this pin, so it is suspended and not connected. Pin 6 is grounded, pin 7 Vin is the power supply terminal, connected to power . A high-quality, low ESR ceramic capacitor is indirectly connected between the power supply and the ground. The 8-pin pH is the source of the internal power FET, and the freewheeling diode and inductor are connected externally. The powerpad end of pin 9 is the heat dissipation metal sheet on the back of the chip, which must be connected to the ground (GND).The output voltage value of tps5430 is determined by the partial voltage value of its 4 pins, and the output voltage Vout = (1.221 (R1 & Themes; 1.221) / r2) v. Wherein, R1 is the resistance above partial voltage and R2 is the resistance below partial voltage. For the design of tps5430, R1 can be taken as 10K , and R2 can be calculated according to the output voltage to be obtained. According to r206 (1.11k), r208 (3.07k) and R210 (5.36k) given in Figure 4, we can calculate that the output voltages are 12.2v, 5.2v and 3.5V respectively, which is slightly higher than the design value by 0.2V. The load is relatively heavy, and the voltage is just right when loaded.N208 (lm2576-12) is a product of American National Semiconductor. Pin 1 is the power supply terminal and connected to power ; Pin 2 is the output end, which is externally connected with freewheeling diode and inductance; Pin 3 is the grounding terminal and pin 5 is the on / off control terminal of the power supply. Due to the output of negative voltage, pins 3 and 5 are not grounded, but connected to the - 12V power supply; Pin 4 is the voltage feedback terminal. We use lm2576-12 with fixed 12V output, so pin 4 is grounded and there is no need to connect the feedback resistor to divide the voltage.Design of high voltage power supply circuitThe portable B ultra-high voltage power supply circuit is shown in Figure 5, using DC / DC converter. Ua3843 is a high-performance, fixed frequency and current mode controller specially used for DC / DC converter applications. It provides designers with a cost-effective solution using the least external components. It is divided into PWM control, cycle current limit, voltage control and so on.Figure 5 48V power supply circuit1 PWM controlPower supplies voltage to pin 7 of N1 (ua3843) through resistor R34, and the sawtooth oscillator formed by external R36 and C33 of pin 4 of N1 and internal circuit starts to work. The PWM pulse is output by pin 6 of N1 to control the on time of MOSFET V9 and determine the output voltage. R37 is used to suppress parasitic oscillation and is usually connected in series near the MOSFET gate. The gate resistance r37 should not be too large, which directly affects the charge and discharge of the input capacitance of the MOSFET by the PWM drive signal, that is, the switching speed of the MOSFET. The induced electromotive force output by the 9th and 10th pins of the secondary of the switching transformer is rectified by vd14 and filtered by C35, L7 and C36 to form a 48V DC output voltage to supply power to the B-ultrasound probe. The induced electromotive force output by the 7th and 6th pins of the secondary of the switching transformer is rectified by vd13 and filtered by C39, L8 and C37 to form a - 48V DC output voltage to supply power to the B-ultrasound probe. Vd12, C34 and R38 form a spike pulse absorption circuit, which is used to suppress the spike pulse with extremely high amplitude generated by the drain of V9 at the moment when the switch turns from on to off. Its principle is: at the moment when V9 is cut off, the spike pulse generated by its drain forms a charging circuit through vd12 and C34. The charging current suppresses the spike pulse within a certain range to avoid V9 being impacted by the spike pulse. After C34 charging, C34 discharges through R38 to prepare for absorbing spike pulse again in the next cycle2 cycle current limitPin 2 feed back is the feedback voltage input terminal. This pin is compared with the reference voltage (generally 2.5V) at the in-phase input terminal of the internal error amplifier to generate the control voltage and control the pulse width. This circuit grounds it and is controlled by pin 1 of the output terminal of the internal error amplifier. The cycle current limit signal of pin 3 determines the width of PWM pulse, that is, the output voltage. R47, r48, R14 and C32 externally connected to pin N1 (ua3843) form a cycle current limiting circuit. In each oscillation cycle, when the peak inductance current of winding 3 5 in the primary of switching power supply pulse transformer L6 reaches the set value, the PWM pulse will be turned off. The set value is determined by the voltage of pin 1 comp terminal of N1 (ua3843) (pin 1 comp is the output terminal of internal error amplifier), Usually, a feedback network is connected between this pin and 2 pins to determine the gain and frequency response of the error amplifier. The cycle current limit control process is as follows: the switch tube is turned on, the inductance current rises, and the sampling voltage V3 rises. When the voltage of pin 3 is greater than 1V, the internal current detection comparator turns over, the internal PWM latch resets, closes the PWM pulse, and is ready to enter the next cycle. In order to eliminate the sharp wave pulse interference of the current limiting circuit, a sharp wave filter circuit is composed of R14 and C32 to ensure that the cycle current limiting function is effective in each oscillation cycle. The current limiting sampling resistance of R47 and r48 determines the maximum output current of the whole switching converter. The maximum output current can be adjusted by changing its resistance.3 voltage controlN1 (ua3843) is a current mode pulse width modulator with two closed-loop controls. The current sampling signal is sent to pin 3 of the in-phase input end of the current detection comparator to form a current closed-loop control, the error voltage is sent to pin 1 of the output end of the internal error amplifier, and its output is sent to the inverting input end of the current detection comparator as a comparison reference to form a voltage closed-loop control. It can be seen that the voltage closed loop and the current closed loop interact. Finally, both of them control the PWM latch through the current detection comparator, that is, control the width of the PWM pulse. The voltage closed-loop control circuit is composed of voltage reference N2 (tl431a), optocoupler B4 (tlp521) and resistors R31, vr7, R12, R32, etc. The current signal output by the optocoupler B4 (tlp521) is converted into a voltage signal and sent to pin 1 of the output terminal of the internal error amplifier. The internal reference of N2 (tl431a) error amplifier is 2.5V. The voltage closed-loop voltage stabilizing control process is as follows: the output voltage rises, the reference terminal VR of tl431a rises, the conduction of TL431 rises, the conduction of optocoupler B4 (tlp521) rises, the voltage of pin 1 drops, the turnover of internal current detection comparator is advanced, the reset of internal PWM latch is advanced, the PWM pulse becomes narrow and the output voltage becomes low, so as to stabilize the output voltage. High voltage output voltage Vout = (1 R31 / (R12 vr7)) VREF. By adjusting the value of potentiometer vr7, the output can be adjusted to 48V, and the adjustment range is 31 & times; 2.5=77.5V115&TImes; 2.5=32VepilogueThis paper introduces the design of portable B-ultrasound power supply, including power switching

Why is arc suppression coil called arc suppression coil?Why is arc suppression coil called arc suppression coil? If you want to know why you call it so, let's talk slowly for you.The reason why it is called this name is that we first look at the word "coil". It is an inductive coil with iron core, which is applied in the neutral grounding system. The power system transmission line is grounded through arc suppression coil, which is a kind of small current grounding system, so it is called "coil".Arc suppression coil is so called because it can play the role of "arc suppression". Its arc suppression principle is that when the line is short circuited and grounded and the current is more than 30a, the voltage generated by the discharge gap will increase by 2.5-3 times the line voltage. When the arc suppression device is installed at the neutral point of the transformer, the voltage at the discharge can not increase under the damping effect of the inductance coil, so as to reduce the discharge current and reduce the current, It also plays the role of arc suppression. When the magnitude of the two currents is less than the minimum current of the arc, the arc will not occur and there will be no resonance overvoltage. According to the regulations of overvoltage protection and insulation coordination of AC electrical devices issued by the former Ministry of electric power industry, when the single-phase grounding fault capacitance current of 3-66KV system exceeds 10a, the grounding mode of arc suppression device shall be adopted.It is mainly used in power supply industry, power plants, metallurgy, mining, coal, papermaking, petrochemical and other large factories and mining enterprises. The applicable voltage level is 6 66kV. It is an ideal replacement product for old arc suppression coils. At the same time, it is also the preferred supporting product for grounding compensation and line selection devices of new substations.In fact, why is it called arc suppression coil? As the name suggests, it is an inductive coil to effectively prevent arc grounding of power system, eliminate grounding fault and improve power supply quality.Complete set of automatic tracking compensation device for arc suppression coil

What does integrated gate commutated thyristor (IGCT) meanIntegrated Gate Commutated Thyristors IGCT (Integrated Gate Commutated Thyristors) is a new type of power semiconductor device used in giant power electronic devices published in 1996. IGCT is a new high-power semiconductor switching device based on GTO structure, using integrated gate structure for gate hard drive, using buffer layer structure and anode transparent emitter technology. It has the on state characteristics of thyristor and the switching characteristics of transistor. Due to the buffer structure and shallow emitter technology, the dynamic loss is reduced by about 50%. In addition, this kind of device also integrates a freewheeling diode with good dynamic characteristics on one chip, so as to organically combine the low on-state voltage drop of thyristor, high blocking voltage and the stable switching characteristics of transistor in its unique wayIGCT makes great progress in power, reliability, switching speed, efficiency, cost, weight and volume, and brings a new leap to the complete set of power electronics devices. IGCT integrates GTO chip with anti parallel diode and gate drive circuit, and then connects with its gate driver in a low inductance way. It combines the advantages of stable turn-off ability of transistor and low on state loss of thyristor, gives full play to the performance of thyristor in the on stage, and presents the characteristics of transistor in the off stage. IGCT has the characteristics of large current, high voltage, high switching frequency, high reliability, compact structure, low loss, low manufacturing cost and high yield. GTO with thyristor technology is a common high-power switching device. It has higher performance in cut-off voltage than IGBT with transistor technology. However, the widely used standard GTO driving technology causes uneven turn-on and turn-off process, requiring high-cost DV / dt and di / dt absorption circuits and high-power gate driving units, resulting in reduced reliability and high price, It is also not conducive to series connection. However, before the maturity of high-power MCT technology, IGCT has become the preferred scheme of high-voltage, high-power and low-frequency AC.The figure below shows the outline of asymmetric IGCTIGCT is similar to GTO. It is also a four layer three terminal device. The GCT is composed of thousands of GCTs. The anode and gate are shared, while the cathode are connected in parallel. The important difference from GTO is that there is a buffer layer inside the IGCT anode, and the transparent (permeable) anode is used to replace the short-circuit anode of GTO. The on mechanism is exactly the same as that of GTO, but the off mechanism is completely different from that of GTO. During the off process of IGCT, GCT can instantly change from on to blocking state, become a PNP transistor and then turn off, so it has no external Du / dt limit; The GTO must be converted through an intermediate unstable state that is neither on nor off (i.e. "GTO area"), so GTO needs a large absorption circuit to suppress the change rate Du / dt of the re applied voltage. The equivalent circuit of IGCT in blocking state can be considered as the series connection of a base open circuit, low gain PNP transistor and gate power supply.The IGCT trigger power is small. The trigger and state monitoring circuit and the IGCT tube core can be made into a whole, and the trigger signal and working state signal can be input and output through two optical fibers. IGCT integrates the advantages of GTO technology and modern power transistor IGBT. Using the key technology that high-power shutdown devices can be simply and reliably connected in series, IGCT has no real rival in the medium and high voltage field and the high-power application field with power of 0.5mva 100mva.The following table shows the performance comparison of IGBT, GTO and IGCT power devices:The advantages of low loss and fast switching of IGCT ensure that it can be reliably and efficiently used in 300 KVA 10MVA converter without series or parallel. When connected in series, the inverter power can be extended to 100mva. Although the high-power IGBT module has some excellent characteristics, such as active control of di / dt and DV / DT, active clamping, easy to realize short-circuit current protection and active protection, etc. However, due to the disadvantages of high conduction loss, open circuit after damage and no long-term reliable operation data, the practical application of high-power IGBT module in high-power low-frequency converter is limited. Therefore, IGCT will become the preferred power device of high power and high voltage frequency converter.

At CES 2017, we saw countless game peripherals, and ASUS once again expanded its "player country" (Rog) product line, and launched peripherals such as microphone, game mouse and high-end router. First, let's introduce the Rog Strix Magnus microphone, which is specially built for the live streaming media market and has a compact shape. In terms of function, the microphone includes three groups of studio level capacitive pickups, and can reduce the ambient sound.Rog Strix Magnus microphoneIt is worth mentioning that the microphone can also be used as an external USB hub and supports aura RGB lighting effect.Rog gladius II game mouseRog gladius II is an optical mouse equipped with aura sync RGB light effect and OMRON button. Users can adjust DPI in real time through two buttons (one button is behind the wheel and the other is at the thumb position, so as to select the best accuracy when aiming).ASUS claims that its buttons can withstand 50 million clicks and support easy replacement. This can not only prolong the service life of the device, but also enable players to adjust the feel on demand.New Rog Strix evolve mouseThe top cover of the new Rog Strix evolve mouse is divided into four pieces, which is very in line with the ergonomic design. Left handed players will appreciate this replaceable top cover design.In addition, ASUS also launched a new Rog Strix impact mouse, which adopts a lightweight design, which is suitable for users who like dexterous, accurate and simple control.It should be noted that both Strix evolve and Strix impact support aura sync RGB light control and OMRON buttons.Rog gx970 mouseThe mouse adopts the design of switchable side panel, and the user can choose between two side keys and ten side keys (these two side plates are provided in the packaging box at the same time). Through the supporting software, users can also specify functions for keys and store them in onboard ROM.The Rog gx970 mouse also supports counterweight adjustment, with a maximum tracking speed of 12000 DPI.Rog rapture gt-ac5300 wireless routerFinally, Rog rapture gt-ac5300 tri band wireless router is introduced. In addition, it also provides 8 & Themes; Gigabit Ethernet port.The route adopts an unspecified 1.8GHz quad core processor, and the gaming center software can be used as a good tool to quickly monitor and adjust network traffic (such as optimizing Ping value for popular games).In addition, ASUS also launched a gt-ac5300 wireless router, which provides two "game specific" LAN ports and supports functions such as GameBoost (which can optimize the network communication of the game).

Excel is the most magical and important software in MS office series. Stop foolishly clicking around with the mouse! Use these 10 basic skills to improve work efficiency and get twice the result with half the effort1. "Ctrl PgDn / PgUp" conversion worksheet2. Use "Ctrl directional character" to quickly convert cellsOf course, you can just press the direction key and move it grid by grid. But if you want to quickly convert cells, long press "Ctrl" before pressing the direction key, and you can achieve the effect of "key step like flying" in an instant.3. Skillfully use the "shift" key to select dataUse "Ctrl Shift" to select cells vertically and horizontally, so as to select the area you want.4. Double click auto fill dataTo automatically fill in the same column with functions, don't long press the mouse and try to pull down to the last column - what if your table has hundreds of rows? Double click the lower right cross of the calculated cell to easily fill in the complete column of data.5. Let the three shortcut keys quickly unify the data formatDo you want the data to appear to two decimal places? Use Ctrl Shift!.How much is the unit? Use Ctrl Shift $.What percentage do you want? Use Ctrl Shift%.Isn't it tired to click the mouse so many times? Use these three shortcut keys to realize the uniform format of the speed of light, and the latter two should be particularly easy to remember.6. Lock the cell with F4When filling data according to functions in Excel, sometimes you want the cells you reference to change when they drop down, and sometimes you don't think so. When you want to "absolute reference" - that is, lock the cell, you must add a $sign before the row and column. Want to type these dollar symbols manually? It's crazy... How much time will it waste, you know? In fact, there is a simple technique, that is, after you select the cell, press F4 to enter the dollar symbol and lock it; If you continue to press F4, you will cycle back one by one: Lock cells, lock numbers, lock uppercase letters, and unlock.7. Summarize statistics with countif and SUMIFCountif is a function algorithm that counts the number of cells that meet established conditions within a specific range. The first parameter is the range you want to count; The second parameter is your condition. For example: = countif (A1: a10,1), that is, within the range of A1: A10, the cell content is 1 number.COUNTIF(range,criteria)The SUMIF function is used to sum several cells, ranges, or references based on specified conditions. Below is the total number of views we are calculating for each author. In terms of scope, the format of the author's name is inconsistent, but the total number is the same. Column B corresponds to the name of the corresponding author, and column e corresponds to the number of views of each author's work.SUMIF(range,criteria,sum range)8. Use vlookup to find the data you wantVlookup is a search function by column, and finally returns the value corresponding to the required query column order of the column. Here we can see a data table. The first column is the ranking of law schools. We can use vlookup to create a query of the top five schools.VLOOKUP(lookup value,data range,column number,type)The first parameter needs to enter the value to find. Here we use the number of rankings we need. The second parameter here, enter the region we want to find (absolute reference). For the third parameter, you need to enter the number of columns of the returned data in the search area. For the fourth parameter, because we want to find it accurately, enter "false" or "0".9. Merge cells with "&"We now have a column of last names and a column of names. We can use the "&" symbol to create a column of data that combines last names and first names. In Excel, "&" refers to merging two or more texts. Don't forget to type a space between your last name and first name. Your function should look like this format = [first name] & "& [last name].10. Generate random number with rand functionYou can use the rand() function to generate a single random number, which is less than 1 but greater than or equal to 0. Just leave the parentheses empty without typing any parameters. The new random number will be regenerated with the update of the workbook. You can also press F9 to recalculate the worksheet to update the random number, but remember to be careful when operating.RAND()

Speaker unit for home theater set Speaker unit refers to the situation of speakers (commonly known as speakers) used in the set speaker of home theater. It usually refers to the size, shape and material of speakers, which mainly determine the characteristics of speakers.Most of the structural forms of subwoofer are cone basin type, and a few are flat plate type. There are many kinds of subwoofer diaphragm, including aluminum alloy diaphragm, aluminum magnesium alloy diaphragm, ceramic diaphragm, carbon fiber diaphragm, bulletproof cloth diaphragm, glass fiber diaphragm, propylene diaphragm, paper diaphragm, etc. Bass unit, which determines the sound characteristics of the speaker, is relatively important to choose. The bass unit with aluminum alloy diaphragm and glass fiber diaphragm generally has small caliber and large bearing power, while the bass unit with reinforced paper basin and glass fiber diaphragm has accurate timbre and good overall balance when replaying music. The paper basin has natural sound, low cost, good rigidity, light material and high sensitivity. The disadvantages are poor moisture resistance and difficult to control the consistency during manufacturing. However, the paper basin is made everywhere in the top hifi system because the sound output is very average and the reducibility is good. Bulletproof cloth, with wide frequency response and low distortion, is the first choice for those who love strong bass. Its disadvantages are high cost, complex production process, low sensitivity and poor light music effect. The wool woven basin has a soft texture. It performs very well for soft music and light music, but the bass effect is poor and lacks strength and shock. PP (polypropylene) basin, which is widely popular in high-grade speakers, has good consistency, low distortion and commendable performance in all aspects. In addition, fiber diaphragm and composite diaphragm are rarely used in popular speakers due to their high price.Generally speaking, as long as the frequency response curve of the mid-range loudspeaker is flat, the effective frequency response range is greater than the width of the playback frequency band it undertakes in the system, and the impedance is consistent with the sensitivity and low-frequency unit. Alto units generally have cone basin and ball top. But its size and power are larger than the tweeter and suitable for playing medium audio. The diaphragms of the Alto unit are mainly soft materials such as paper basin and silk film, and occasionally there are a small amount of alloy ball top diaphragms.The function of high-frequency loudspeaker in speaker is to replay various high-frequency signals, and its working frequency is generally above 2K. The overall requirement for high-frequency loudspeaker is that it can have flat frequency response, high-frequency playback upper limit as much as possible and certain power bearing capacity to meet the requirements in the effective working frequency band. Its structural forms mainly include horn type, cone basin type, ball top type and aluminum belt type. At present, the most common domestic speaker and small monitoring speaker is ball top type. The ball top tweeter is divided into hard ball top and soft ball top from the material. The diaphragm materials of hard top treble include aluminum alloy, titanium alloy, magnesium alloy, titanium alloy composite film, glass film, diamond film and so on. The treble played back by the hard top treble unit has bright timbre and metal feeling. It is suitable for playing pop music, film music and effect music. The production of excellent aluminum alloy and titanium alloy composite film dome tweeter can also better express classical music and human voice. The vibrating film materials of the soft ball top tweeter are silk film, silk thread film, rubber film and bulletproof cloth film. The soft dome tweeter unit is flexible and relaxed when replaying music, and has good natural expressiveness. It is particularly handy when performing classical music, human voice and other music with standard listening concepts. In recent years, the playback upper limit frequency of silk film and silk film ball tenor has reached 40KHz. Theoretically, the upper limit frequency of tweeter unit should at least reach 20kHz, the higher the better. However, the unit with excellent high frequency upper limit is also more expensive.Naturally, the larger the speaker size, the better. Large caliber bass speakers can perform better in the low-frequency part, which can be selected in the purchase. Most of the subwoofers in ordinary home cinemas are between 5 and 12 inches. The speakers made of high-performance speakers also mean lower transient distortion and better sound quality.