Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

26 questions with no upvoted or accepted answers
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1answer
100 views

PCB etching not working: everything etched

I tried to etch a PCB with the photoresist method, using sodium hydroxid as developer and ferric chlorid as etcher. I think the problem is in the development phase. Although reading a lot about ...
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2answers
175 views

Bubble etching versus rocker tank

I make my own PCBs and etch them in a homemade bubble tank. The tank has failed after a couple of years largely due to the etchant slowly eating it's way through some of the materials (glues, pipes, ...
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0answers
270 views

fiducials on a panel

have a little question about fiducials: My Layouter/My Boss likes to use 3 fiducials on the panelframe and one fiducial on each individual board in the panel. My job is to build the program for the ...
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0answers
2k views

0.5mm Pitch BGA Fanout - Reasonable Vias, Drills, Traces and Clearances

I'm pretty new to layout and using Altium. I need to break out a 0.5mm pitch Spartan 6 BGA, I want to use "reasonable" vias, drills, traces, etc... but I don't really know what that means now a days....
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2answers
111 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 ...
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0answers
47 views

Strange powerplane layering issue in designspark

I'm trying to order a 6 layer PCB from a fab but they are asking me to resolve an issue with the file and I'm a bit stumped on what to do about it. The second layer of the design I have designated as ...
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0answers
50 views

How to solve via on pad without plugging?

There are some vias on pad in my design. I've read some articles and know that these vias should be plugged to avoid solder wicking. However, the board house told me that they can't provide a plugging ...
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0answers
99 views

Reversed silk screening on EasyEDA

Just a quick one. I'm not sure if the text should be mirrored on the bottom layer of EasyEDA. It seems okay in the 3D preview, but when I upload the gerber to JLC their preview shows it still reversed....
1
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1answer
71 views

Accidentally Pasted Beyond Origin in Altium

I'm new in Altium and I accidentally pasted some pads and components(the ones at the bottom corner) from another pcb file but I wasn't aware of it at first because it didn't show on the sheet on the ...
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0answers
419 views

Problem isolating vias. Solder mask offset

I detected a shortcircuit between two vias in one of our PCBs. The shortcircuit was caused because an offset on the solder mask leaves part of the via's ring "half opened". When the PCB was assembled, ...
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0answers
105 views

0.8mm PCB for a PSU circuit

I am working on a PSU that converts 230 VAC to 12Vdc (0.1 A). The board has the necessary clearance and creepage distances. Would it cause any safety issue (IEC60950) if the 0.8 mm (or 1.2 mm) thick ...
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1answer
95 views

Can resistive traces be created on a PCB?

I'm assuming that copper traces on a PCB have negligible resistance. Is it possible to put a trace on a PCB that has some greater amount of resistance? The amount of resistance would not need to be ...
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0answers
88 views

How to calculate stray capacitance on PCB

I use a 0.4mm spacing between PCB traces (including 0.4mm space between crystal pads and ground) and I believe that's causing stray capacitance. My circuit board is typical (1 ounce copper on FR4 ...
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0answers
123 views

cause of photoresist removal after etching

I just tried to do a new PCB today with the photoresist method but what is very strange is that after etching it, I rinsed the board with water and wiped it dry, but as I wiped it dry with toilet ...
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0answers
76 views

how does multilayer PCB Press/lamination machine work or bond the layers?

I just know the components involved in this process of bonding layers: Vacuum hot press to remove air bubbles, Piston Press to apply pressure and some temperature device to create the temperature. i ...
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0answers
77 views

1oz copper ok for card edge connector in prototype?

I'm doing a small prototype system and would like to fab boards at one of the inexpensive Chinese places like: https://www.elecrow.com/pcb-manufacturing.html I'm going to bus the boards using ribbon-...
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0answers
91 views

Oculus development Kit 2 headset design, main PCB cutout

I've been reviewing the Oculus development Kit 2 headset design. Files here There is a cutout in the PCB that confuses me. It's 1mm wide and there isn't any notch or anything on the assembly to fit ...
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0answers
137 views

Problems with PCB Trace / Signal — But Continuity Present

I've been working with a reasonably sized Chinese PCB fabricator, and we've had random problems with boards for the last few months. I'm not an expert PCB layout guy, but we aren't talking about ...
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0answers
55 views

Printing resist onto paper pcb

Is there a paper that can go into a printer to be used as a pcb? Basically what I'm looking for is a silicon sheet with a thin layer of copper on top that ink can be printed on to be used a resist. ...
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0answers
1k views

Half-etched fiducials Vs through-cut fiducials

While making PCB, I added 8 fiducials (fids) marks so that pick and place machines use these marks as referent points on the PCB to position the surface mount components (Packages) during assembly. ...
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0answers
119 views

Does black anti-static FR4 PCB affect circuit performance?

I want to make a PCB using black ESD FR4 substrate, purely for aesthetic reasons. The circuit function will be analog audio. I presume this material has a small amount of conductivity in order to ...
0
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1answer
66 views

How to count Collective failure rate for chips?

i wonder where 0,81 from, from this lecture www.eng.auburn.edu/~agrawvd/COURSE/FULL/lec3.ppt -page 14. i try find specific area in failure rate, but it seems i can't find 0,81 from let's say Chips = C ...
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230 views

Programming a Gate Array with a 3d Printer

I'm a software engineer, and so this question probably shows my total ignorance of this field... I have been researching various options for manufacturing digital logic circuits in low volume. ASICs ...
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1answer
51 views

Cannot find ATSAMS70N21A-AN lead width and lead length?

I have trying to make a breakout board for ATSAMS70N21A-AN. I then tried to design the footprint in KiCad, so when I was looking for the dimensions on the datasheet I couldn't find the lead width or ...
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156 views

How to properly develop a PCB everytime without taking too much photoresist off

Its been a while since I made a good PCB and I can't remember what I did to make it perfect, but after reading various resources, I have determined the following as to why most of my design was ...
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1answer
73 views

EAGLE GERBER files nit opening in CAM 350

I have chinese factory that I need to assemble PCB. They cannot open eagle gerber files, only altium how to fix