The bare circuit board may be assembled on different levels. A cheaper level of the board may have some missing parts that go into a final product at a cheap level. Some boards with special features tend to face the same problems, too. Label part numbers to help identify this problem.
By the way, the assembled board might have a stick-on label with the final assembly number.
#PCB Assembly
I’m making a 4 layer PCB prototype that uses a bluetooth mcu connected to a 2.4GHz chip antenna. I’m thinking about what to do with the feedline, whether it should be buried on one of the middle layers, or left on the top layer. To get a 50 ohm line, should I choose top layer with 13-mil width or buried miccrostrip with 7-mild width?
The assembly note states: Bake bare PCBs in a clean and well ventilated oven prior to assembly at 125*C for 24 hours. Why is this necessary?
Many a time our PCBA manufacturer calls us about a problem of the design file. Sometimes we think it is time-consuming to discuss this issue. Just want to know why they always do that.
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