All Questions
Tagged with pcb-fabrication pcb-assembly
120
questions
0
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2
answers
86
views
Is it possible to create new footprints and integrate additional components into an already manufactured PCB?
What is the most effective method to do so? I have enameled wire, which seems safer to me due to the insulation. My plan is to cover them with solder mask. However, I have a question: Would it be ...
- 145
1
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0
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71
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PCB Layout review: ESP-07 with 28BYJ-48 Stepper board
I have used the 28BYJ-48 in conjunction with an ESP8266 in some applications and I thought it would be handy to have pcb made. I want to use JLCPCB including Pick and Place.
The Kicad source code is ...
- 737
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votes
1
answer
148
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What should be the minimum number of SMD components on a reel (minimum tape length) for a pick and place machine?
What should be the minimum number of SMD components on a reel for a pick and place machine? Different scenarios are possible for each machine. In terms of professional machines, if everyone writes ...
- 756
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1
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167
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PCB design - Routing without a schematic
I am using Altium CircuitMaker to design a PCB. I'm wondering if there's a way to make my PCB design without a schematic.
My idea is to simply make a PCB with just pads and populate it myself with the ...
- 41
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votes
1
answer
92
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PCB Design Process
I'm new to PCB Design so I wanted to clarify a few things about the process.
For context, I have already physically made my project on a breadboard. Now I am trying to lay it out on a PCB.
I have ...
- 41
2
votes
1
answer
135
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Production quality issue?
I had 5 two-layer boards fabricated by a popular assembly house in China and I'm curious what folks thoughts are based on what I received.
Here is a photo of the 5 boards which has a red square around ...
- 507
0
votes
2
answers
95
views
Why are some components missing areas of pour near mounting holes?
Circled in red are component through holes in a copper pour plane that are missing areas / don't have the copper poured completely around the via. Seen on tons of components both through hole and ...
user298907
1
vote
1
answer
63
views
How to add 2 or 3 parallel Li-ion cells to my custom PCB
I've tinkered with electronics and components for quite some time now, but I'm kind of a noob when it comes to taking things to "production".
I've this project using an ESP12-E, powered by 2 ...
- 13
11
votes
5
answers
3k
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Are these tracks too close for comfort, will this distance cause any problems?
I'm doing some PCB wiring and I am connecting many buttons to an Arduino Mega's digital inputs. The idea is that the digital pins will be normally high and when I push one of the buttons, the digital ...
- 125
5
votes
3
answers
1k
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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 ...
- 163
3
votes
1
answer
447
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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
2
votes
1
answer
1k
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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 ...
- 131
1
vote
1
answer
178
views
PCB Silkscreen Marking
Today, I came on a PC board and the silkscreen marking have TG on it. What is the component for TG?
4
votes
3
answers
1k
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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 ...
- 107
0
votes
2
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562
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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 ...
