Basic knowledge of electronic components

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First, the basic knowledge of electronic components - - common terms
Single panel: Only one side of the circuit board is treated with metal;
Double panel: Both sides of the circuit board are treated with metal;
Component surface: one side of the component inserted on the circuit board;
Welding surface: The reverse side of the component surface, there are many pads for welding;
Pad: A metal part on a PCB that is used to solder the component pins or metal ends;
Laminate: In addition to the two sides of the circuit board, the circuit board also has lines;
Air-welding: The joints between the parts or pins and the solder pads are not completed for some reason;
False welding: similar to air welding, because the amount of solder between the parts feet or lead pins and solder pads is too small, it does not meet the joint standard;
Cold welding: After tin or paste is gasified in the return air furnace, there are still fuzzy granular attachments on the tin mat;
Bridging: Short circuit of the solder connection between the feet and the feet;
Metallized hole: metallized holes for plug-in components or plain wires;
Connection hole: opposite metallized hole, metallized hole that is not used to insert components or clear wires;
Polar components: Components to be inserted into the circuit board
Feet: The foot of the part is broken to form a crooked foot;
Error: The specification or type of the part is not consistent with the requirements;
Missing parts: vacancies should be placed where the parts are to be placed;
Self-inspection: The completion of work by the work in accordance with the rules of the inspection of the work;
Self-check step one: check the previous process steps;
Self-inspection step 2: After completing the process, inspect the process;
Self-inspection requirements: no acceptance, no production, no outflow of unqualified products;
Second, basic knowledge of electronic components - - common components
Common electronic components mainly include resistors, capacitors, inductors, potentiometers, transformers, etc. This is only a brief introduction, I believe that children's shoes are understood by friends ~~
Resistance: The symbol is R, and the unit is ohm, which means that the conductor hinders the current and is the inherent property of the conductor.
Capacitance: The symbol is C, and the unit is Henry. It is a kind of container filled with electricity and has the characteristics of "passing AC and blocking DC";
Inductance: The symbol is L, and the unit is Farad. It is a kind of element that converts electrical energy into magnetic energy and stores it. It has the characteristics of "passing DC, blocking AC".
Potentiometer: It is a type of variable resistor that can adjust the resistance;
Transformer: It is a device that uses the principle of electromagnetic induction to change the AC voltage.
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