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Usually we call the frequently used key PCB components, core components in the circuit, easily interfered components, PCB high-voltage components, PCB high-calorific components, and some heterogeneous components as PCB special components. The visit layout of these special components requires very careful analysis. Because the improper placement of these special components may cause circuit compatibility errors and signal integrity errors, resulting in the failure of the entire PCB circuit board.
PCB special components
When designing how to place special components, first consider the size of the PCB. When the PCB size is too large, the printed line will be too long, the impedance will increase, the dry resistance will be reduced, and the cost will increase; if it is too small, the heat dissipation will not be good, and adjacent lines will be easily interfered. After determining the PCB size, determine the square position of the special component. Finally, all components of the circuit are arranged according to functional units. The location of PCB special components should generally follow the following principles when arranging:
1. Try to shorten the connection between high-frequency components and minimize their distribution parameters and mutual electromagnetic interference. Components that are susceptible to interference should not be too close, and the input and output should be as far away as possible.
2 Some components or wires may have a high potential difference, so the distance between them should be increased to avoid accidental short circuits caused by discharge. High-voltage components should be placed out of reach as much as possible.
3. Components weighing more than 15g can be fixed with brackets and then welded. These heavy and hot components should not be placed on the circuit board, but should be placed on the bottom of the main box, and heat dissipation should be considered. Keep hot parts away from heating parts.
4. For the layout of adjustable components such as potentiometers, adjustable inductors, variable capacitors and micro switches, the structural requirements of the entire board should be considered. If the structure permits, some commonly used switches should be placed in a position that is easily accessible by hand. The layout of the components should be balanced, dense and not heavier than the top.
PCB components
The success of a PCB product must first focus on its internal quality. But considering the overall beauty, both are perfect PCB circuit boards to become successful products. Improper placement of these special components may cause circuit compatibility errors and signal integrity errors, so in the process of architecture, it must be done well.
How to use an electric soldering iron to disassemble electronic components?
When disassembling electronic components with electric soldering iron to disassemble the components on the printed circuit board, use the soldering iron tip of the electric soldering iron to contact the solder joints at the component pins. After the solder at the solder joints melts, pull out the component pins on the other side of the circuit board. Then solder the other pin in the same way. This method is very convenient for removing components with less than 3 pins, but it is more difficult to remove components with more than 4 pins (such as integrated circuits).
The components with more than four pins can be disassembled with a soldering iron or ordinary soldering iron, with the help of a stainless steel hollow casing or an injection needle.
Use a soldering iron to disassemble PCB resistor multi-pin components: Use the soldering iron tip to touch the pin solder joints of the component. When the solder of the pin solder joint is melted, the injection needle of the appropriate size is placed on the pin and rotated to separate the component pin from the soldering copper foil of the circuit board. Then remove the soldering iron tip and pull out the syringe needle, so that the pins of the PCB components are separated from the copper foil of the printed circuit board, and then the other pins of the components are separated from the copper foil of the printed circuit board in the same way. Finally, the PCB components can be pulled out of the circuit board.
