All Questions
Tagged with pcb-assembly pcb-design
16
questions
30
votes
3
answers
11k
views
Should I worry about the risk of tombstoning?
A colleague has (apparently unsuccessfully :-)) tried to convince me of the risk of tombstoning
in the following situation:
He claims pad 1 for R55 and R59 will lose heat faster during ...
- 146k
12
votes
3
answers
6k
views
Soldering heatsink pad on bottom of IC
I am attempting to make a board for the tlc5951 24-channel led driver to drive an 8x8 rgb led array. I have made what I think is a good eagle library for the sop-38 package, but I am not sure what to ...
- 2,054
44
votes
5
answers
14k
views
Why did Axial Capacitors Fall Out of Use in the Industry?
When inspecting the boards from electronics made in 1980s and earlier, one distinct feature is the extensive use of axial, electrolytic capacitors as power supply filter. Axial ceramic decoupling ...
- 7,218
21
votes
3
answers
8k
views
How to secure cables to a PCB
What is a good way to secure cables to a PCB?
There are some good advice in the following post, but the application is slightly different:
Securing electrical cables to holes in enclosures?
In this ...
- 429
20
votes
3
answers
2k
views
When and why use triangle solder joints
I found these triangular solder joints in a 24v power supply. Why are they made as triangles? This is the first time I have seen it and I was unable to google anything about it.
- 473
19
votes
1
answer
4k
views
Designing Pick-and-Place-friendly CAD library parts
I'm working on a PCB design with surface mount components to be manufactured by a PCB assembly shop. I'm using CADSTAR, and I had to populate the library with some components, from scratch. I'm new to ...
- 1,053
16
votes
4
answers
11k
views
Feasibility of PCB edge plating?
How feasible is it to edge plate a PCB or at least a portion of one? I've seen it done but as I understand the outer edge is only cut after plating at most fab houses. Is this something that's ...
- 2,525
16
votes
6
answers
19k
views
Any tricks to attaching a wire or pin to a testpoint?
More and more often, I find myself needing to tear apart a device to seek out and connect to serial pads. These pads typically give me access to the underlying operating system for research or ...
- 263
12
votes
3
answers
4k
views
PCB fabrication vs PCB assembly
What is the difference between PCB fabrication and assembly? Some companies like Golden Phoenix list that based on the size of PCB, it outputs a quote.
Mine was 2.1 x 1.6 inch. It outputted 29 pieces ...
- 289
6
votes
1
answer
848
views
How do PCB fabrication houses make PCBs?
I know the different ways of making PCBs at home, but I can't seem to find a lot of information on how board houses professionally make their PCBs. Is this how they do it?: http://www.youtube.com/...
- 4,546
4
votes
1
answer
1k
views
From what pitch should I consider ENIG finish
My design (4-layer, FR4, 1.6mm) has a couple of ICs with 0.5mm pitch pads and some LEDs with 0.4mm pitch pads, very small LEDs.
Should I consider ENIG (more expensive) or will HASL do the job?
I read ...
- 2,127
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?
0
votes
2
answers
1k
views
Soldering wire directly to a PCB through hole vias, what is acceptable proximity tolerance?
The wire gauge is 16 AWG. The hole size is 63 mil, and the overall via diameter is 98.5 mil.
What is the minimum spacing between two of these for voltage levels of 0-12V and 0-160V circuits?
I think I ...
user298907
0
votes
2
answers
129
views
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 ...
- 7
0
votes
1
answer
175
views
Building using single sided PCB proto-board
I have a prototype board like this one:
Note that mine does not have the arrows/numbers on the side. Looks like a cutout from the middle section.
It only has golden circles on top. So far I'm used ...
- 203