Questions tagged [pcb-assembly]
The process of mounting electronic components onto a printed circuit board. This can be done manually with a soldering iron, or automatically using a "Pick and Place" machine.
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Calculating minimum prepreg thickness to withstand high voltage difference between layers
I am considering doing a 4-layer PCB for a 3-phase system (400 V) for the first time (never done a high voltage board before).
Because of mechanical constraints, I want the board to be as thin as ...
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Hot glue for circuit boards
Is it a good idea/safe for circuit board components to be submerged in hot glue, in order to essentially "weatherproof" them to a certain degree? I don't believe the components will have the ...
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What are these legs to connect to an IC called on a PCB?
I am designing my first PCB and it is going to be designed to plug into IC sockets on a motherboard (replacement modern RAM for retro computers).
I was wondering what to use for the legs. Looking ...
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PCB Silkscreen Marking
Today, I came on a PC board and the silkscreen marking have TG on it. What is the component for TG?
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Is it OK to solder to large copper pour area
Is it a problem to integrate an SMD pad into a large copper pour area? In this case, the packages are 1206. I am wondering if I need to be concerned about thermal issues and interfering with standard ...
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PCB Design on width
I would like to construct a 25A on board. How much mil or mm should I use for wire width? I have search for it size shown that 300mil/7.62mm for 10A.
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How to predict costs for getting PCB assembled?
I have a PCB that I designed that has around 40 components (mostly resistors and capacitors) on a board that is 40 mm by 80 mm. I have the BOM, pick and place file, and gerber file. If I provide the ...
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Pick and place file from Excel
Further to the question here
I want to know how the centroid point is calculated in Eagle software?
Above picture shows the coordinates of the 2-pin SMD connector @ (51.7,26.4).
But when I exported ...
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SMT Reflow solder quality issue with SN42/BI58 paste
I have been doing hardware design and PCBA prototyping for a while and I have issues with quality of reflow soldering. I have a small lab including a pick'n'place machine, stencil printer (eC-stencil-...
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BGA Microcontroller Only Works with Finger Pressing
I have a PCBA with a BGA microcontroller on it. I found that two UART pins send/receive garbled output unless I press my finger down on the BGA package itself.
I've seen this on a few boards and I ...
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Placing components between DPAK IC pins
Is it accepted practice to place components between the pins of a DPAK IC like in this picture?
KiCad says "courtyard overlap" in the DRC, but this shouldn't be a problem, I think. During ...
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Clarifications about PCB assembly
I just finished designing my PCB, I printed it and assembled it. Everything seems to be working fine after some tests. However, assembling the load cells and power cables was really complicated and ...
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What is the best location for Top Component Center
When designing footprints of symmetrical components like SOIC-14, it is easy to determine the top component center, but where should be the best location for an unsymmetrical component?
Is top ...
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Missing solder mask opening on PCB footprint
I have three through-hole PCBs that are missing front and back solder mask openings for two of the components. The solder mask (usually green) is covering the front and back solder pads. All other ...
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AC/AC power supply for PCB
I am trying to source the right setup for powering this PCB:
I have found an 18 V AC/AC power supply but it has a barrel connector:
I am struggling to work out how to connect the barrel connector to ...
