Every hole on PCB is called through hole. From the perspective of function, through hole can be divided into two categories: one is used as an electrical connection between layers; The second is used for fixing or positioning devices. If from the process,
The manufacturing process of PCBA involves many links, and only by controlling the quality of each link can a good product be produced. Generally, PCBA is made of a series of PCB circuit board manufacturing, component purchasing and inspection, SMT patch
Then use these technical documents and production documents to make PCB board, component welding, fly needle testing, circuit board debugging, and complete the complete copy of the original circuit board template.
It's best to take two pictures of the device's location with a digital camera. A lot of pcb circuit boards do more advanced above the diode transistor some do not pay attention to see.
The signal integrity problems of PCB mainly include signal reflection, crosstalk, signal delay and timing error.
It has been proved that the reliability of electronic equipment will be adversely affected even if the circuit diagram is designed correctly and the printed circuit board is not designed properlyAt present, the printed circuit board is still used as the m
The value of the matching resistance should be determined by the maximum value of the output drive current and the absorption current of the integrated circuit.
The chemical residue in the gold settling process can be left in the hole where the plug hole is not sufficient, causing problems such as weldability. Moreover, tin beads may be hidden in the hole, which may splash out during assembly or actual use, causi
To prolong the life of devices and prevent failures, effective heat transfer management is very important. Overheating conditions on the board can not only speed up the failure mechanism, but also cause the device to become too hot to handle and in some c
There is no doubt that condensation will severely test the insulation resistance of the coating. There are many coating products that can withstand this kind of test, so you can avoid these problems by choosing the right materials at the beginning of the
its melting point is much higher than that of the tin solder, which results in the reduction of the weldability of the surface of the welding pad, and the non-wetting of the welding pad and the solder climbing to the welding end of the device are easy to
Power integrity directly affects the signal integrity of the final PCB board. Power supply integrity and signal integrity are closely related, and in many cases, the main cause of signal distortion is the power system.
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