PCB proofing refers to the trial production of PCB before mass production. After the electronic engineer presets the circuit and completes the PCB Layout, he carries out the process of small batch trial production to the factory, that is, PCB proofing.
1. Complete PCB board making file (Gerber file, position map, steel mesh file) and board making requirements; 2. 2. Complete a BOM(including the model, brand, package, and description). 3. PCBA assembly drawing
Printed circuit boards are not common terminal products, because the definition of the name is a little disorderly.
The correct screen printing layer character placement criteria is: "no ambiguity, see stitches, beautiful and generous".
In concept, wireless transmitter and receiver can be divided into two parts: fundamental frequency and radio frequency. Includes the frequency scale of the input signal of the transmitter and the frequency scale of the output signal of the receiver.
PCB board is a closed electronic device, is the electronic component of the support body, is the electronic component of the electrical joint carrier. HDI board is a high density interconnected circuit board.
If the PCB circuit board has the functional requirements and the demand to reduce the cost, Shen Yin is a good choice; With the outstanding flatness and touch of silver sinking, it is more appropriate to choose the silver sinking process.
High density interconnection (HDI) circuit board technology can provide a higher density of circuit wiring, can make the end product preset more small scale.
Integrated circuit board manufacturing process: 1, the drawn circuit board is printed out with transfer paper 2, cut the copperplate with sensitive plate to make the circuit board diagram of the whole process 3, with fine sandpaper to the surface of the c
At present, the technology of metal extraction and recycling in waste printed circuit boards has been relatively mature. However, there is the problem of recycling the large amount of metal that remains after extraction.
It is difficult to flatten the thin pad by the process of straight tin injection, which brings difficulties to SMT mounting. The shelf life of extra tin-spray plate is very short. Gilding neatly solves these problems
The most fundamental difference between gold plate and gold plate is that gold is hard gold (wear-resistant), gold is soft gold (not wear-resistant).
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