Research and production of basic multimedia courseware for analog electronic technology based on PowerPoint and EWB He Feiyan (Dongguan Institute of Technology, Dongguan 523006, Guangdong) courseware production and research, the research shows that the combination of PowerPoint and EWB (<simulation electronic technology for multimedia courseware production is Feasible and necessary.
This article discusses ("The problems of traditional teaching of analog electronic technology, while pointing out the deficiencies of using PowerPoint, Authorware, Flash to produce courseware; describes the use of PowerPoint and EWB to combine" simulating electronic technology "for multimedia courseware production Process and skills, and introduced the function of EWB.
1 Professional basic courses for the purpose and significance of research and production. But for a long time, the traditional teaching effect of analog electronic technology is not ideal for several reasons: First, the structural characteristics of nonlinear components are abstract, and students find it boring and difficult to understand and accept. Second, the unit circuits are many and complicated. Sometimes, in the teaching of one class, five or six circuits must be drawn on the blackboard. For example, when teaching a basic amplifier circuit, you need to draw the circuit structure diagram, AC and DC paths, micro-equivalent circuit, etc. on the blackboard to analyze it, which takes a lot of time and the teaching efficiency is low. Third, the analysis of the working principle of the circuit, including the flow direction of the working current, input and output waveforms, circuit distortion analysis, etc., is only a rational analysis, which is difficult for students to understand and accept. For these reasons, the author believes that it is best to follow the rapid advancement of computer technology. In recent years, the teaching of "Analog Electronic Technology" has introduced computer-assisted teaching. The software used includes PowerPoint, Authorware, Flash, etc. The courseware produced is also image, Vivid, to a certain extent, improve the teaching effect. But the author believes that this does not meet the teaching requirements of analog electronic technology. Because analog electronic technology is a highly practical technical discipline, when teaching, only the combination of theory and practice can better enable students to understand, understand, and master. While using PowerPoint to produce distortion, the Bode plotter in the instrument library can observe the amplitude-frequency curve and phase-frequency curve of the circuit, and measured = 90 out, ï¿¡ 11 = 4.5 out, and person 1 = 26. Here should be What measures are taken to solve the distortion and widen the passband? At this time, the modification function of the EWB helps, you can join the team 2 in the Rnl loop, and then repeat the above process, you find that the distortion is reduced, and the frequency band is also widened, indicating negative Feedback can reduce nonlinear distortion. The distortion analysis function of EWB can be used to analyze the distortion curve. From the distortion analysis curve, it can be seen that the distortion inserted into Re2 is significantly reduced. We can also use the noise analysis function of EWB to analyze the noise of the output node and the equivalent input noise, and use the potential temperature scanning analysis function to analyze the stability of the operating point. In courseware made with PowerPoint and other software, such a functional analysis process cannot be done. And in the actual experimental demonstration, the time and complexity of such a process are even more indescribable.
It is difficult to do in experimental analysis, which can be easily analyzed and processed in EWB. Such as negative feedback amplification performance analysis, self-excitation phenomenon analysis, phase compensation analysis, power amplifier characteristic analysis, Fourier analysis, noise analysis, filter zero pole analysis, component parameter scanning analysis, operational amplifier fault tolerance analysis, etc. All can be realized in the powerful analysis function of EWB.
Using EWB to make (<Analog Electronic Technology> courseware, it can cultivate students' analytical ability and adapt to the requirements of society for talents.
Deepening students' understanding of concepts and principles achieves our desired effect. Only by visualizing abstract theories and allowing students to raise rational knowledge to perceptual knowledge can they better grasp it. The emulation function of EWB can realize this desire. For example, when teaching the concept of modulation and demodulation, if the simulation function of EWB can be used to simulate the modulated wave, carrier wave and modulated wave, then the teaching will achieve a multiplier effect. In fact, this is very easy to achieve.
Cultivating students 'ability to troubleshoot and lack the ability to develop innovations, etc., the students' practical problem-solving ability is not strong, and the ability to improve students in PowerPoint and other productions can not be improved. EWB is a very good electronic technology experimental training tool. When making teaching courseware, we can set up faults for the components of the simulated circuit according to the actual situation. For example, when making the bridge rectifier circuit courseware, for example, we can set such a fault: â‘ Let D open. â‘¡ Make the capacitor C open. â‘¢Open D and C at the same time. Aiming at these different kinds of fault conditions, the EWB instrument is used to observe various states of the circuit, and students are required to determine the fault point and eliminate the fault according to each state, which is more difficult to do in actual experiments.
The current society is an innovative society, which requires schools to put the cultivation of entrepreneurial skills and entrepreneurial spirit in a prominent position so that students can adapt to and serve the society as soon as possible after entering the society. Electronic technology is the realization of mastering modern technology. An important subject of modernization, learning electronic technology requires not only mastering its basic principles, but also cultivating students 'ability to analyze circuits, and more importantly, cultivating students' innovative abilities in circuit design and application development. Due to the limitations of laboratory components, instruments and equipment, it is unable to meet the requirements of students for the design and debugging of various circuits, and EWB can virtualize a complete electronic component library and a variety of circuit analysis methods on the computer. Advanced electronic workbench. Fully meet the requirements of students for the design and debugging of various circuits. For example, when designing an RC sine wave oscillation circuit, first determine the circuit structure and component parameters theoretically according to the circuit index requirements, use EWB to draw the circuit diagram, and analyze the designed performance The indicators are verified. If the parameters of the circuit components are not met, the circuit can be repeatedly debugged until the satisfaction is satisfied by using various analysis of Ewb. stop. Such repeated bridge rectifier circuit fault analysis diagram EWB is applied in the courseware production of analog electronic technology, which can make the analog electronic technology courseware more perfect, and makes up for the lack of pure theoretical teaching of making courseware with PowerPoint, etc. The production of the courseware adds vitality, EWB is very suitable for the auxiliary teaching of electronic courses. It is conducive to students' mastery of knowledge combined with theory and practice, and it is conducive to improving students' ability to analyze and solve problems, as well as to cultivate students' innovative ability.
5 The framework for the production of multimedia courseware for the simulation of electronic technology 6 Problems and solutions encountered in the courseware production process and production techniques In the initial conception of courseware production, I plan to open the EWB platform directly in PowerPoint, as long as the EWB shortcut is created in PowerPoint "The way is right" 丨 for teachers to enter the Peng Peng analog electronic technology teaching-the use of the author's job is to make a complete courseware of analog electronic technology multimedia, in the courseware, the simulation process and ideas of each circuit should be shown. The original idea was to use the camera to convert the EWB simulation process into video, and then insert it into PowerPoint, but this effect is very poor. After searching for information, I found Hypercam and Snagit software. These two software are like cameras. The demonstration process of the screen was taken and saved in the form of video, which solved this problem.
Inserting video files shot by Hypercam or Snagit into PowerPoint will cause distortion. The solution is to lower the resolution in the desktop properties of the computer before shooting before shooting, and then adjust the resolution back after shooting. Right-click the inserted movie in PowerPoint, and change the length and width to 100% in the picture format: size to solve the distortion. This method is more complicated, and later, as long as you click during playback, you can open the video file for playback.
7 Conclusion According to the description in this article, I draw the following conclusions: First, with the development of science and education, change the traditional teaching model, and promote the introduction of multimedia teaching in various subjects of the school according to the actual situation, which will greatly promote the effect of teaching. According to the characteristics of analog electronic technology courses, it is necessary to introduce multimedia teaching to make the analog electronic technology teaching mode enter a new stage.
Second, at present, there are many teaching contents and less class hours for electronic communication majors in colleges, universities and colleges. According to this problem, the National Education Commission advocates the preparation of three-dimensional textbooks for various subjects. This call was born.
Third, the analog electronic technology courseware produced by the combination of PowerPoint and EWB can visualize the principle and analysis of the circuit, highlighting the difficulties, emphasis and vivid image. Promote the interaction of teaching, greatly improve the efficiency of teaching and students' enthusiasm for learning.
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