All Questions
27
questions
2
votes
1
answer
98
views
Best ways to mask missing toner after toner transfer PCB etching
I want to make a general guide for masking the missing toner on copper clad after toner transfer.
The masking methods I know so far:
Permanent marker (some say it doesn't work, I am intimidated by it ...
- 663
22
votes
7
answers
7k
views
In PCBs, why is copper etched away instead of added?
I know that in virtually every case, PCBs start as a substrate with a layer of copper laminated on top, which is then etched away, leaving the traces. But why are the traces not added on an empty ...
- 757
1
vote
2
answers
630
views
Polygon pour on internal signal layer ALTIUM
I am working on a six layer PCB, the layers are Top layer, layer 1...layer4, Bottom layer. I am trying to create a polygon pour on any internal layers (for example layer 1). However when I try to pour ...
- 41
1
vote
1
answer
509
views
Why are my copper PCB solder pads oxidizing?
I work at a place that sells LED strip lights and we don't have an engineering team, so I am hoping that someone can help me figure out what is going on because I've tried everything and I haven't ...
4
votes
2
answers
424
views
Why did the liquid tin evaporate off my board when soldering?
On the weekend I designed and etched a tiny little 12V booster circuit for an OLED. To prevent the traces from oxidising in the future, I removed the leftover ink after etching and placed the board in ...
- 620
0
votes
1
answer
167
views
Determine copper thicknesses for multi layer PCB
When deciding PCB stack-up generally accept the manufacturer suggestions. Especially they calculate the track impedance more accurate. For my last design I checked the guideliness for the FPGA (...
- 13
6
votes
2
answers
3k
views
Ferric Chloride Etchant Disposal
I am a beginner with PCBs and wanted to start making some. But before I did, I wanted to make sure I was completely prepared. I just wanted to make sure that the information I have is correct and had ...
- 63
0
votes
1
answer
393
views
Relation ship between Track width, Impedance, Dielectric and copper thickness
I like to know the relationship between different factors like track width, impedance, dielectric and copper thickness.
After quite a reading I got to know that as the track width of a cline is ...
- 217
1
vote
3
answers
381
views
Is a cosmetic logotype on an outer copper layer a bad idea?
I've seen many people add logotypes and other graphics in the copper layers of PCBs, often also removing the solder mask in these places to expose the bare (or rather plated) copper.
Is there ...
- 459
2
votes
2
answers
183
views
Copper layer delaminates on Printed Circuit Board
I have been making the PCB boards by the conventional process since last few years (pressing, etching, drilling, soldering).
I usually iron the photo paper to the PCB board for around 15-20 minutes ...
- 21
1
vote
4
answers
2k
views
Copper dimension around the PCB component's hole (pad?)
I had my first PCB manufactured (by a Chinese manufacturer). In this first version I only used thru-hole components (not SMD).
I used the latest version of Eagle to design it, without taking care to ...
- 83
2
votes
3
answers
1k
views
Corroded PCB from Rechargeable NiMH battery
This NiMH battery began to leak battery acid onto the circuit board / PCB below it. Some of that acid ran down one of the wires connected to the battery and pooled up at the foot of the plug where it ...
- 205
1
vote
2
answers
256
views
Reasons for using no conductor finish on PCB
Some PCB manufacturers, such as Eurocircuits or PCBWay, offer the choice of no conductor finish (vs ENIG, HASL, Immersion Tin, OSP or others). Since this option is not often chosen, it raises the ...
- 11
4
votes
1
answer
2k
views
Can Silkscreen Go Directly Onto Copper PCB Layer? (No SolderMask)
Hi I am wondering if a PCB silkscreen layer can be printed directly onto a copper layer without a solder mask. I don't see this often but I have a design for which this would be useful. Has anyone ...
- 151
3
votes
2
answers
1k
views
PCB grounding through screw head
Can we use zinc plated screws for PCB grounding?
Means the zinc coated screw head will be in contact with copper trace on PCB for grounding.
But this can cause galvanic corrosion between zinc and ...
- 31