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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SMD button not in jlcpcb BOM
I want to try the jlcpcb assembly service.
I created the BOM, by using the bom2grouped_csv_jlcpcb. I inspected the generated file and indeed all the SMD components ...
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Replacement IC for SGM2212 LDO Regulator
I'm looking for a suitable replacement IC for the SGM2212-3.3XKC3G/TR found in this schematic. I've found this, which seems to be very similar and suitable for this application, but I'd like if ...
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Component/Footprint selection in EAGLE for PCB designing
I'm a beginner and I want to build a basic PCB using EAGLE software. I want to only use SMD components but I have few doubts while using EAGLE:
I want to design a PCB schematic by using standard ...
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PN532 RFID Reader IC taking up 4mA even when there is no power applied
I have designed a custom PCB for one of my side projects. PN532 is interfaced with ESP32 over i2c. Goal is to have the system consume current in uAmps range when in deep sleep. I put ESP32 in deep ...
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Need help figuring out circuit board design
I'm building a clock I found on Thingiverse. The designer created a custom PCB to connect three stepper motors, an Arduino Nano and some Hall sensors. Unfortunately there aren't many instructions. I'...
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Is it feasible to put solder mask cured on the top of tinned pads?
I made a batch of PCBs with a QFN package IC. I accidentally connected the pad to GND even though it should be either left floating or connected to some signals else. I am glad that I have requested a ...
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Excessive brown flux post reflow
I've been assembling low numbers of reasonably complicated PCBs professionally for a few years now, and while I can get good results eventually, one thing that's dragging the process out is the need ...
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Question on "Parts should be used within 5 days after opening." statement on component shipping package
I've been given the task of verifying a batch of ICs from a chinese broker, to see that the chips the company has bought are what the broker claims they are. The package we've received looks like this,...
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Fix for poorly designed class-D amplifier mute circuit
I recently made a PCB for a project with several class-D amplifier channels to drive small speakers for audio feedback. I included a mute switch which connected or disconnected one end of these ...
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Do companies usualy change PCB layout if they create different versions for different markets? [closed]
I was wondering what's common practice.
If a company like Samsung for instance creates a phone for the international market (SM-G975F) and the Korean market (SM-G975N), and the Korean phone has some ...
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Functional discrepancy within PCBA batch
When manufacturing a small prototype batch of an embedded system at EMS I have detected different behavior between the units. All units work as expected, except that some units fail to operate same ...
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Interaction between PCB surface finish (ENIG vs HASL), wave soldering, and manual final assembly
I am developing a PCBA that is (for me, an amateur) fairly complicated: 4 layers, double-sided, mixed SMT/THT assembly. It is a fairly dense layout with ~150 total components including all the ...
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Altium Variants In Bill Of Materials
Is there any way in Altium to display/combine the different Variant configurations in a single Excel sheet exported from the Bill of Materials, e.g. have the different variant configurations displayed ...
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Covering up PCB soldering pads
I have a PCB that I'm wanting to use just for stability purposes to hold other components. Basically, I want to put a stacking header on it (for a Pi) and then hot glue some modules to the top and ...
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Flexible PCB design suggestion
I'm currently learning to design a PCB. For this board, I want to sense the current in two different ways (using either analog or digital current sensors). Each sensor requires a current sense ...
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