Hdi circuit boards and buried blind hole PCB distinction
Have buried blind hole is not necessarily hdi PCB circuit board, hdi board usually have blind holes, buried hole is not necessarily, to see your product is the product of a few order pressure. Instructions are as follows: 6 layers PCB in order, second order is the need for laser drilling of the board, namely HDI PCB. 6 layer of first-order HDI board refers to the blind hole: 1 - 2, 2 - 5, 5 - 6, 1 - namely 2, 5 - 6 laser drilling. 6 layer of second order HDI board refers to the blind hole: 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6. That is 2 times the laser punch. Drill 3 - in the first place 4 buried hole, then pressing 2 - 5, then drill 2 - for the first time 3, 4 - 5 laser hole, then time pressing 1-2 6, then drill 1 - for the second time 2, 5 - 6 laser hole, finally to drill hole, so the second order twice pressing after the HDI board, two laser drilling. 12 buried layer blind hole PCB second-order HDI board also is divided into: wrong hole second-order HDI board and pile hole second-order HDI board, wrong hole second-order HDI board is refers to the blind hole 1 - 2 and 2 - 3 is staggered, and fold the second-order HDI board is refers to the blind hole hole 1 - 2 and 2 - 3 fold together, for example: blind: 1 - 3, 3 - 4, 4 - 6. So on the third order and fourth order & # 8230; … Are the same. Rocket PCB as a professional supplier of PCB circuit boards, focus on high-precision double-sided/multi-layer circuit board, HDI board, thick copper, blind hole buried plate proofing and small batch, high frequency circuit board production and PCB board production.
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Plexiglass sheet aluminum grille, speaker, amplifier, battery, paint, PLEXIGLASS glue, screw Step 2: Prepare materials, warning: it is very important to use safety equipment, goggles and masks! !
Use the soldering iron and try to remove as much as possible from one side of the PCB board.
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