The application of Multisim in the teaching of electronic courses In order to better integrate modern electronic design technology into traditional teaching and experiments, we have reformed the electronic courses from the aspects of teaching mode, experimental links and experimental content. Adjust Rb, observe the change of the static operating point, observe the change of the output signal; o Increase the input signal to 1V, measure the voltage of the output signal, observe the waveform of the output signal, after observing the result, the change of Rb will change the static working point Q. Increasing Rb, the Q point moves down, the output signal is prone to cut-off distortion, otherwise, reducing Rb, the Q point moves up, the output signal will have saturation distortion. Change the input signal, the output signal will change. However, when the input signal is relatively large, the output signal is distorted by clipping and deshaping, and the output signal no longer follows the ratio of the magnification of the AC voltage to the input signal. This phenomenon is caused by the input signal being too large. Therefore, it is emphasized that the input to the AC amplifier circuit should be a small signal, which is the premise of the micro-variable equivalent circuit.
When it comes to the effect of temperature on circuit parameters, the same is used as an example to change the operating temperature of the components in the circuit, and then compare the change in the static operating point of the circuit and the change in the output signal waveform before and after the change. It is emphasized that temperature affects the parameters of components, thereby affecting the stability of the circuit. Electronic technology courses that make full use of virtual resources are very practical courses. The cultivation of practical ability is not only to teach them to learn how to solder components, use breadboards and instruments, but also to cultivate their ability to use advanced technology to realize electronic design. The teaching procedure of the traditional experimental class is that after the teacher explains the experimental content, experimental principles, circuit diagrams, and experimental instruments used, he usually demonstrates the experimental process to the students, and then lets the students complete it by themselves. This teaching method is very important in the early stage of the experiment, but if you follow the same model every time, it is not conducive to cultivating students' ability to analyze problems, nor is it conducive to the improvement of practical skills.
In addition, the current electronic technology experiment is basically completed on the experimental bench and experimental box. Especially in the analog electronic technology part, each experiment box can only complete a single experiment. If you want to complete more experiments, it means that you must increase investment and buy more experiment boxes. In the case of limited funds, it can only meet basic experiments. In order to expand the experimental content without having to invest a lot of money, virtual technology is a good solution. In this way, not only can more experimental content be added at the same time, but also there is no need to worry about the damage of components and instruments. The operating results show that this experimental method not only improves the efficiency of the experiment, relieves the pressure on the laboratory, saves hardware resources, but more importantly enables students to master advanced electronic circuit design methods.
Reforming the experimental content and focusing on the cultivation of students' comprehensive design capabilities The strong practical characteristics of the project make the electronic technology courses not only have a certain verification experiment, but also require a large number of comprehensive and design experiments. This type of experiment can give full play to students' initiative, improve students' practical ability, and cultivate students' creativity. In comprehensive and design experiments, the emphasis is on free design. However, with the rapid development of electronic technology, new circuits and new devices are constantly emerging, and the shortage of experimental resources in various laboratories limits the completion of comprehensive and design experiments.
Even if it is barely satisfied, once the wiring is wrongly connected and the components burn out, its hope of success will disappear with the smoke when the device is burned. The electronic virtual technology has a full range of inexhaustible electronic components, and various instruments make it possible to increase comprehensive and design experimental content. Conclusion Multism is deeply involved in the teaching and experiment of electronic technology courses with its rich component library and instrumentation, and powerful simulation functions. Practice shows that the use of Multisim to reform the teaching model, experimental methods and experimental content is successful.
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