Dots of glue are used where components may fall off. If components are on the bottom side of the board, then all are glued. Boards with bottom side components must be raised on stand-offs to provide clearance from the conveyor.
consulte Mais informação: PCB de dupla face: Um guia detalhado para iniciantes
#Assembléia PCB
We are a green energy brand which sells solar water heater. All of our products are almost use PCB. And we want to know whether it is poisonous to human and environment?
Eu sou uma aquisição de projeto. Recentemente, Nosso projeto é desenvolver uma televisão. De todo o fornecimento de materiais, PCB foi o mais lento. And even our engineer took part in the discussion with PCB supplier to push them. Is it really hard to make a RF PCB?
I am prototyping a PCB, using Chip Quik’s “SMDSWLF.031, a Sn96.5/ Ag3.0/ Cu0.5 solder with 2.2% no-clean flux. I find that the black spots appears frequently in larger pads on my board. I wonder if it is because I left the soldering iron more time heating the solder and that burnt the flux. What is that black residue? Is that a sign of a bad joint or maybe bad soldering technique?
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