Alternative method, resistance measurement method, etc. These methods are very simple and practical. Here we will not talk about scraping one by one: it means rusting the parts of the components to be installed, going to three, mastering the use of maintenance tools and common instruments and the use of techniques. Beginners should be very Proficiency in the application of multimeters for a variety of measurements, other tools must be able to do their best. It is also required to master the routine use and operation of instruments such as oscilloscopes, frequency sweepers, and signal generators. Practice has proved that the correct use of various tools and instruments can reduce the hidden troubles and mistakes in the operation process and improve the reliability and success rate of the assembly of the whole machine.
Fourth, the basic assembly technology and preparation before assembly The success or failure of electronic and electrical amateur assembly, in addition to the reasons for circuit design, the key lies in the assembly technology. The assembly process is good, the adjustment is smooth, the performance can meet the requirements; the assembly technology is not well mastered, not only the appearance is not beautiful, the components are uneven, the circuit board is messy, the adjustment process will also be full of failures, the performance can not reach Prepare the tools and materials you might use. Such as multimeters, electric irons, tweezers, pliers, various screwdrivers, solder, rosin, sandpaper, etc. Be careful not to use the combination tool of that suit, which is inconvenient to use. , lists the components. According to the number of components in the circuit diagram, the resistors, capacitors, inductors, transistors and other devices are sorted and listed, number, model and main parameters are listed for inspection and replacement. When assembling, each component is mounted on the circuit board and marked in the list to avoid missing or misplaced. At the same time, please note that the “Remarks†column is left in the list. For components with different models or values, please indicate in the “Remarks†column, as a thin layer of tin on the abnormality during debugging and overhaul. :Measure: refers to the polarity and performance of the component through testing; welding: refers to the component is installed and soldered on the circuit board;: the position and polarity of the component are correctly installed, and the welding is good.
After the whole machine is assembled, the power can be debugged after the road resistance measurement is basically normal, so that the performance indicators meet the design requirements. For those who are not working properly, they need to be tested and repaired. In this process, there are many situations in which the fault is caused by improper debugging methods or sequences. The main reasons are: (1) damage to the adjustable components; (2) disorder; (3) adjustments cause other faults; (4) the circuit itself may be faulty. Under the actual circumstances, various reasons are mixed. Because of the lack of theoretical level and experience, beginners often cannot determine which side of the fault is caused, so they become more and more chaotic and ultimately have no choice. Practice has proved that it is best to have clear goals before hands-on debugging, remember each step of the operation you have done (return to the original state when invalid), pay attention to observe the changes of key points or phenomena, summarize the rules, avoid blind confusion To adjust, when a fault occurs, it should first find the basis based on the phenomenon and the measured data, and check it step by step.
In short, in the whole machine assembly of electronic appliances, circuit theory knowledge is the premise, and practical experience is the basis. As long as you have patience and meticulously do the above, you will be able to successfully complete your favorite electronic production. At the same time, your practical experience, skills and theoretical level will be improved. Zhao Pengde wants to buy (1) LM201A produced by Texas Instruments, if there are other imported substitutes; (2) Hall 302B produced by Asahi Kasei Co., Ltd., the sensitivity is C. The number of the above products is 9-51
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