Install the resistor in the specified position according to the diagram. The mark is required to be upward and the word direction is consistent. After installing the same specification, install another specification, and try to make the resistors as high and low as possible. After soldering, cut off the excess pins exposed on the surface of the printed circuit board.
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In the field of electronics, especially in the field of PCBA, thermal conditions are critical to the life cycle, performance and function of the device. Environmental conditions often affect how designers lay out their components on a PCB.
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The resistance in the circuit is represented by R and a number, such as R15 means a resistance of 15. The main functions of resistors in a circuit are shunt, current limit, voltage divider, bias, filter (used with capacitors) and resistor matching.
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Recently, according to Qingdao's "Opinions on Supporting the Reform and Development of Private Enterprises and Small and Medium-sized Enterprises" (Qingfa [2020] No. 14) and Chengyang District's "Implementation Opinions on Supporting the Reform and Development of Private Economy and Small- and Medium-Sized Enterprises" ” (Chengfa [2020] No. 18) and other documents, Chengyang District Bureau of Industry and Information Technology will be awarded the honorary titles of “Gazelle” in Shandong Province, “Specialized and Specialized New” in Shandong Province, and “Invisible Champion” in Qingdao in 2021. 27 high-growth companies are to be rewarded with funds. The maximum reward for a single company is 1 million yuan, and the cumulative amount is more than 22 million yuan.
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In fact, there are many parameters related to FETs, including DC parameters, AC parameters and limit parameters, but generally pay attention to the following main parameters:
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There are two types of FETs: junction type and insulated gate type. The junction field effect transistor (JFET) gets its name because it has two PN junctions, and the insulated gate field effect transistor (JGFET) gets its name because the gate is completely insulated from other electrodes. At present, among the insulated gate type field effect transistors, the most widely used is MOS field effect transistor, referred to as MOS transistor (ie metal-oxide-semiconductor field effect transistor MOSFET); in addition, there are PMOS, NMOS and VMOS power field effect transistors, etc.
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