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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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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With the development of large-scale integrated circuits, the volume and weight of electronic equipment are getting smaller and smaller, while the traditional continuous regulated power supply cannot meet the optimal design of the whole machine due to its large size and low efficiency. Switching power supply is a new type of power supply with small size, light weight and high reliability. It has the outstanding advantages of low power consumption and high efficiency, and its efficiency can reach more than 75%. Switching power supply to replace linear power supply is an inevitable trend of industrial development.
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