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WhatsApp: +86 18203695377WEBMar 23, 2018 · Check out the figure below: Pasting the double sided tape on PCB. Now, place the board on the sacial layer, leaving a 1 sqcm border like before. Placing the PCB board. And now gently apply pressure on the board so that the board adheres to the sacial layer. Observe the milling surface to see if its level.
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WhatsApp: +86 18203695377WEBJan 5, 2022 · A class 1 board allows the ring to be broken by the drilled hole, while class 2 requires the hole and the ring to be tangent. Class 3 boards have the highest reliability rating of all, and the annular ring must not be thinner than 5 mils at any point around the hole. Another key design rule of thruhole vias is choosing via sizes according to ...
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