PCB Blogger-China PCB Factory,HOYOGO

If you are developing a new product, and you need to perform SMT  prototyping   to test the design first, or you need the smallest batch of products for feasibility verification, you may not want to pay very expensive for PCBA processing .  So how to choose a manufacturer that provides low-cost SMT  prototyping ?       1.  SMT quality Manufacturers need to have suitable equipment and experienced personnel in the industry to provide high-quality services for PCBs.  It is also necessary to check the type of test protocol followed by the manufacturer and the industry standard followed by the circuit board to ensure that the manufacturer follows the necessary industry guidelines , including providing inspection for  hazardous substances used in the board and restricted RoHS boards.   Although low cost is an important deciding factor in choosing a manufacturer, it should be remembered that low cost should not be at the expense of quality.     2. Verification of auxiliary materials You also

If you want a PCB to achieve functional operation , it is impossible to complete with a bare PCB board.   We need to mount, plug-in and solder the bare board components.  This step-by-step process is called  PCBA .  PCBA production is one link linked to another. Any problem in any link will have a great impact on the overall quality. Do you know what processes are involved in the processing?       1.  SMT The SMT processing link generally matches the purchase of components according to the BOM configuration list provided by the customer, and confirms the PMC plan of the production.  After the preparatory work is completed, we need to start SMT programming, make laser stencils according to the SMT process, and perform solder paste printing.   Through the SMT placement machine, we need to mounted the components on the PCB,  and perform online AOI automatic optical inspection if necessary.   After testing, set a perfect reflow oven temperature curve to let the circuit board flow through t

If the PCB does not meet the requirements, it will increase the difficulty of the  PCBA  soldering process, which may eventually lead to soldering defects or unqualified PCBA.   So, in order to ensure the efficient completion of PCBA processing, the PCB should meet the following requirements as much as possible:       1.  PCB Size The ideal size of PCB (including board edge) is - width ≧ 50mm, <460mm, length ≧ 50mm.  If the size of the design is too small, a panel includes 2 different kinds of PCB needs to be made.     2.  PCB board edge width The board edge width of the PCB needs to be >5mm, the   panel includes 2 different kinds of PCB   spacing <8mm, and the distance between the pad and the board edge is >5mm.     3.  PCB bending The warpage of the PCB board will affect the placement accuracy and  will  cause the PCB to move unevenly in the direction of the conveyor belt , so the warpage of the PCB board should be as small as possible.  The requirements for bending degre

The impedance control circuit of the  rigid-flex board  is also called t he impedance strip .  When the current that needs to pass through the  circuit  is greater than the maximum value that the  circuit  can withstand, it is necessary to use impedance to control the excess current, which is the principle of impedance control.  Many aspects will affect the resistance value of the impedance line, do you know any aspects?       1.  Different substrates lead to different impedance values The difference of the substrate material has a great influence on the  flexible   board.   Not only the resistance value of each material is different, but even in the case of the same material, the resistance value of each part will not be exactly the same, just as there are no two  same   leaves in the world.   The impedance circuit on the impedance board generally uses a substrate with good material stability.  If the material with poor stability is used, when the resistance value of the material chan

Have you ever encountered difficulties in choosing solder mask ink and cover film when designing PCB?  Both the solder mask ink and the cover film have the function of protection and insulation.  Do you know the difference between solder mask ink and cover layer?     Solder mask inks are generally green, black, white, red, yellow, blue, etc. Cover film are generally yellow, black and white. Compared with the cover film, the solder mask ink can have more choices in color, which can meet the color requirements. Black has good shading properties and white has high reflectivity. White solder mask ink is used for LED backlight, which is more common in flexible boards.   The solder mask ink has thin thickness, low insulation strength and poor bending performance. It is suitable for PCBs that require thinness and low flexibility. The cover film has thick thicker, good bending performance, high protection and insulation strength, and is suitable for PCBs with high insulation strength and high

  Advantages of flexible PCB: a.It can be bent, folded, and winding freely, and can be moved and stretched freely in three-dimensional space. b.Its heat dissipation performance is good, you can use it to reduce the size. c. It can achieve lightweight, miniaturization, light and thin, so as to realize the integration of components and wires.       Because of these characteristics, flexible PCBs are now widely used in digital cameras, mobile phones and mobile phone batteries, medical, automotive, aerospace and military fields. Its circuit design is relatively simple. Although it is relatively more expensive than rigid circuit boards, it can solve the functions that rigid PCB cannot achieve. In order to make a high-quality flexible PCB, we need to pay attention to:     1. Before soldering, please apply flux to the pad and process it with a soldering iron to avoid poor tin plating or oxidation of the pad. Generally, there is no need to process the chip.      2. Please use tweezers to caref

Nowadays, PCBs are very diversified in the electronics industry .   A lthough the structural design and  technology   manufacturing requirements of general multilayer PCBs are relatively high, and the higher the number of layers,   the greater the difficulty of manufacturing.   But the multilayer PCB is particularly popular, because many complex electronic devices need to use it to realize their functions. Do you know the advantages of using multilayer PCB?       1.  Smaller size Because electronic products are developing towards the trend of  small and precision , the size of PCB is getting smaller and smaller.  One of the most prominent and acclaimed benefits of using multilayer printed circuit boards is their size . Due to the layered design of the multilayer PCB, the size of the multilayer PCB is reduced by increasing the number of layers, so it is smaller than other PCBs with similar functions. This has brought huge benefits to modern electronic products such as smartphones, lapto