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.