Questions tagged [pcb-fabrication]
About the manufacturing of PCBs (Printed Circuit Boards).
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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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FR4/PCB electrical permitivity varing over temperature and effects on trace matching, how much does it change?
I have a high speed design that runs at 1.6GHz, there are also matched traces on a 12 layer board. Now I would like to know if the design will function over temperature of a -10C to 50C range and if ...
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IPC 4671 Via Types
In Altium designer the via type can be declared as one of the follows:
I know about tenting. This is where a via is covered. This way it won't cut through the silk screen or solder mask. But why ...
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Easiest way for a beginner to design and make a custom printed circuit
I've used a prototyping board to successfully build an Arduino based system for a custom purpose
I would like to transfer this design to a custom PCB (using a service like PCBWay, for example,) so ...
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Pad above blind or buried via
For very specific reasons, it would be very neat, to have a pad, for soldering, right above a buried or blind via. E.g. the buried via extends from layer 4-6 and the pad is on the top layer directly ...
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PCB fab questions: Surface finishes and reasonable source for a single board
I've designed a unique Stylophone-type keyboard. I've prototyped it on Masonite with copper foil tape. Now, I'd love to get a slick PCB fabricated. It's a large board, but I feel like, as a hobbyist, ...
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PCB manufacturing process: covering holes with soldermask
The PCB manufacturer is asking
These highlighted green areas (they are openings on the bottom soldermask layer) will be exposed in the bottom layer and you required us to cover the bottom layer with ...
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How can I tell if my Excellon drill file is in number format 2.4?
Sierra Circuits has a "No Touch," no minimum board fabrication service.
Their data requirements for that service are:
...
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Flex PCB controlled impedance
I am absolutely new to flex PCBs. I saw some from time to time but never designed one myself.
Now I'd like to get into this topic and the first task would be to create a ~ 10cm board to board ...
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uSD-card PCB front edge smoothing
Looking for the appropriate (best) technology to smooth or coat the PCB surface to minimize uSD-card connector pint wear-out.
Here's the layout
The uSD-card specification is
uSD cards, to my ...
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What should be the recommended PCB thickness for a circuit involving mains voltage, with 4 layers?
The PCB manufacturer has asked if they can use thickness of 1.6mm, but my total stack-up thickness is 1.8mm.
This is the current stack up
What additional considerations should I take into account to ...
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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 ...
- 411
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1
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PCB copper edge for delivering power
I want to tell a PCB manufacturer to create copper edges for the PCB that should pass power from USB Type-C connector that is connected to USB PD charger:
This power module will be soldered to ...
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What is the name for this PCB process?
Here's a picture of these curved circuit boards, this is from the inside of a keyboard. https://diystuff.nl/embedded/advantage2-keyboard-teardown/
It's not flex, and it's not flex-rigid. These ...
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Am I wrong for pouring copper on the PCB? [closed]
Since my early hobbyist days when ferric chloride felt expensive, I designed my PCBs with as much copper left on the PCB as possible so my acid solution could last as long as possible. Since then, I ...
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