PCB design elements affecting SMT manufacturing
SMT manufacturing units are fully automatic, high precision and high speed. As the degree of automation increases, PCB design must meet the SMT equipment requirements.
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Cause of PCB size expansion and shrinkage and solution
The PCB processing process from the inner line pattern transfer of PCB substrate to the outer line pattern transfer by pressing several times will cause different growth and contraction of the warp and weft of the jointed board.
How to prevent board copying through PCB design?
Common ways to prevent PCB copying board: 1, grinding, 2, sealing glue, 3, use special encryption chip, 4, the use of uncracking chip, 5, use MASK IC, 6, the use of nude, 7, in the current of the signal line series more than 60 ohms of resistance, 8, use
How to protect multilayer PCB edge radiation by PCB design?
Protection measures of multilayer PCB edge radiation: The three elements of EMC problems are: electromagnetic interference source, coupling path, sensitive equipment
The problems that should be paid attention to in PCB design are discussed from welding point of view
When designing the PCB, please note the following points: The shape of a and Mark point is symmetrical up and down or symmetrical left and right, and the size of b and A is 2.0mm. c, from the outer edge of Mark point 2.0mm, there should be no shape and co
How to solve the white spot in PCBA patch processing?
The reasons for white spots in PCBA processing are as follows: 1. The circuit board is under inappropriate thermal stress; 2. 2. Due to the influence of mechanical force, part of the resin is separated from the glass fiber, forming white spots; 3. Some PC
How to choose patch inductor for PCBA foundry and material?
Precautions for the use of moisture sensitive devices in PCBA processing:1. Ovens used for baking are required to be ventilated and able to operate under the condition of humidity less than 5%. 2. SMT components shipped in high-temperature carriers can be
From the drawing board point of view of PCB design four suggestions
Four suggestions for PCB design: 1, about positioning hole, 2, about MARK point, 3, about 5mm edge, 4, do not directly on the pad over the hole,
Why is PCB automatic routing not accepted by engineers?
Although PCB automators have been around as long as engineers have known about CAD, engineers involved in designing dense boards have almost completely ignored the implementation of automated technology.
PCBA process control and quality control of 6 key points
PCB manufacturing process involves circuit board manufacturing, component procurement and inspection, patch processing, plug-in processing, program firing, testing, aging and a series of processes.
What is the shelf life of PCB? And how about the baking time and temperature?
After the manufacturing of PCB circuit boards, there is a shelf life, beyond which the PCB needs to be baked, otherwise it is easy to cause the problem of PCB board bursting when the SMT is put on line for production.
Four PCbas track the pros and cons of barcode printing
Many companies use tracking barcodes to allow the plant's field information management system to track the quality of PCBS produced. From the original label paper printed bar codes to today's laser printed bar codes can achieve this purpose.
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