Because there are GPT/ GPB layer in the files,which shows the pointed place are pads with soldermask opening. Then our engineer think the pads should not cover by soldermask ,so they follow the GPT/GP...
It is because these holes are on the copper plane as below picture pointed by green arrow. Then the engineer mislead them as plated . Pls design these holes in the area which don't have coppe...
It is because the cutouts/sots design in silkscreen layers. Then it is hard to recognize them as slots and our engineer just take them as texts frames. We suggest to design the cutouts in outline/GKO/...
I was advised to clean PCB using petrol if alcohol is not available. I tested and found that Petrol and alcohol both works good on PCBs. I have also tried with acetone but it makes white spots on PCB....
A basic PCB starts with a copper-clad fiberglass material or thin copper sheets adhered to either side of the board, as shown in Figure 1-5.Figure 1-5. Core material.With a multilayer board (a board...
With the initial requirements and constraints determined, several choices must be made. A compromise is made between the available materials, the required current requirements, board thickness, an...
