Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

Filter by
Sorted by
Tagged with
0
votes
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 ...
0
votes
0answers
231 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 ...
0
votes
1answer
804 views

How to program an ARM microcontroller?

Is there a way to program the ARM microcontroller without solder it to a dev board? I mean, if I want to develop a product based in the ARM architecture I suppose that I have to use one ...
3
votes
2answers
713 views

Why were hobbyists advised to socket ICs before, but not now? [closed]

When I was little, the general advice for electronics hobbyists was to socket all their ICs. Indeed you would find the word must referring to the need for sockets. This was to prevent thermal damage ...
0
votes
2answers
791 views

How to make soldermask on PCBs for soldering?

I know how to do a PCB until this step (below image) ugly and not safe by short-circuits. I found this PCB Plating Tape on Aliexpress (Link to the aliexpress product. I'm not the seller) which I ...
0
votes
2answers
410 views

How is a trace formed?

I know it's the conductive connection between different points on a circuit board, but what is its form, how is it made? My confusion stems partly from this image of a PCB cross-section, which I ...
0
votes
2answers
209 views

Developing photoresist PCB with UV bank note checker

I'm just looking into developing a photoresist PCB. I bought a kit that contains a photoresist single sided PCB, developer solution (in powder form to mix with water), etchant, and a tank. I have ...
0
votes
1answer
415 views

inverted PCB plug approach (to connect two single sided boards with jumpers)

Currently, I'm only capable of producing satisfactory single-sided PCB's. I wouldn't dare to do double-sided, and I'm not at the stage to hire someone to do double-sided PCB's especially when I don't ...
0
votes
1answer
156 views

glass for developing presensitized pcbs

I don't understand it... When I tried developing a presensitized PCB, I never get perfect results for large boards. If I use a small board (less than 6cm by 6cm) in a picture frame and use the ...
0
votes
3answers
748 views

What things to consider when designing a single layer board?

I currently have a 2 layer FR4 board that is basically a microcontroller with a motor attached to it. There are some discrete switches and connectors as well. Most of the components are SMT ...
1
vote
2answers
448 views

Estimated cost savings by going from a 2 layer to a single layer pcb?

I've been tasked with minimizing cost of an existing design by taking it from a 2 layer board to a single layer board. I've never made a single layer board so I am unfamiliar with pricing. I tried ...
0
votes
3answers
414 views

mini vacuum for PCB production? what's it called?

I made another attempt at doing a PCB with the UV exposure method except this time, I added two transparency sheets on top of the artwork and the lazer printer toner of the artwork touching the ...
0
votes
3answers
279 views

Can vias and traces conduct electricity on PCB surface?

I'm currently designing my first PCB, though when I place a microSD reader on the board I get errors in eagle that the area the reader is over is restricted. I would have thought this would only ...
4
votes
2answers
2k views

Teardrops in Eagle

Is there an good and easy way to add teardrops to traces in Eagle? See the red trace in the following image. I have a board with a lot of vias and drawing the teardrops manually (as I have done in ...
0
votes
1answer
2k views

How to remove ferric chloride stains?

Okay, I know this might sound really offtopic. I made a PCB a while ago and got some ferric chloride stains in my clothes. I've been trying literally everything, from lemon juice, salt, vinegar, coke, ...
1
vote
1answer
100 views

Quality Procedure for Integrated PCB

I am working on a Quality Assurance procedure document for PCB integrator. I did some research on the quality standards followed by different companies. But what I could not find was a general and ...
1
vote
2answers
1k views

PCB Etching (Negative Photoresist) Issue

I seem to be having issues getting my new PCB etching setup to work. My earlier setup worked just fine which included: printing negative artwork on a parchment paper exposing a copper pcb with ...
0
votes
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 ...
6
votes
2answers
995 views

Which “silkscreen” process for home-made PCB prototypes?

For hobby and learning purposes, I do some PCBs at home, using photo-resist positive development (mainly just single/double layer). Obviously, I realized that most professional PCBs have silkscreen ...
1
vote
3answers
2k views

Two different silkscreen colours on the same PCB

Has someone seen or used two different silkscreen colours in the same PCB? If so, can you describe the use of them or how the manufacturing process was? Just thinking about improving the aesthetic of ...
0
votes
1answer
336 views

Can spray paint or a marker block UV for solder mask/resist? [duplicate]

I am planning to make a PCB and putting solder mask on it but I don't have my own laser printer to print the transparency for the mask. I do, however, live near a printing shop with a laser printer ...
5
votes
2answers
884 views

Basics about pick & place PCB design [closed]

I've designed several PCB boards for different experimental products for the small company i work for. Now it's time we move from experimental to actual production. So far the boards i've designed ...
0
votes
2answers
92 views

Altium: what layers these parts in this picture are?

I'm going to create foot print of D-sub sdf-us91-95. in its datasheet this picture of holes is shown. but what are the layers of others and generally what are they?
0
votes
2answers
174 views

Use spray paint to make mask for pre-sensitised board?

I'm about to etch my first simple board for a project. I have a pre-sensitised board that (as I understand the process) you expose to UV light, then develop the board in a sodium hydroxide solution, ...
1
vote
2answers
118 views

Why do datasheets include Tape and Reel information?

Specifically: - Does a PCB designer need to be concerned with tape and reel information? - Is the information intended for PCB assemblers, pick and place machines, etc? - Will a pick and place ...
1
vote
1answer
811 views

aluminum PCB soldering techniques for prototypes

I am wondering if i ordered some aluminum pcbs that contain D2pak transistors and i want to solder a couple of them for testing is it possible using basic equipment or does it need an Reflow soldering ...
9
votes
3answers
745 views

Is there a reference PCB design for hobbyist manufacturers?

I'm considering using a PCB manufacturing house to make me some boards. Since you have to pay, I'm trying get my PCB designs correct but will unavoidably have to go through a learning process. My ...
5
votes
3answers
3k views

Is there a standard PCB Array Size for PCB Assembly?

I am planning on use various PCB assembly houses to get my boards PCB assembled. To minimize process costs, I am told it is best to panelize/array the PCB such that there is multiple boards per array, ...
2
votes
3answers
159 views

How to attach a paper screen to a DIY PCB?

For poor people who can only afford paper and not silk, a home brew silk screen can be inkjet printed onto paper and then glued onto a PCB. Component legs will be poked through the paper. So I have ...
-1
votes
1answer
558 views

solder mask clearance [closed]

The current soldermask clearance in GERBER is 3 mils. Will PCB house reduce it base on their capabilities? I'm a fresh DFM engineer in an EMS company. Soldermask analysis is a part of DFM, changes of ...
3
votes
3answers
2k views

Is there a functional difference between square, round and octagonal via pads?

The reason why these different shapes exist is probably historical, but I'm interested whether there's any reason today to not only use a single kind of via. The ones with round pads are the most ...
2
votes
2answers
286 views

signs of complete PCB photo-resist development

Currently. I'm making a PCB using the photolithographic method (print on transparency, expose with UV which works, then develop under a bright red LED as the only light source), but half the time, the ...
0
votes
2answers
749 views

Flat flex cable soldered to PCB is developing a short circuit over time

I'm facing the issue that an OLED display develops a short over time and stops working. The short always occurs at the solder point where the flat flex cable gets soldered to the PCB. Touching the ...
0
votes
2answers
970 views

Missing top solder mask complaint when trying to order PCB? (PCBWay)

I'm really new to PCB layout and after creating my PCB layout and ordering it from PCB Way my audit was failed for reason "no top solder mask layer." What does that mean and how would I add that? If ...
1
vote
1answer
488 views

PCB Panel Size for Maximum Manufacturability

What is a reasonable panel size to choose when ordering panelized PCBs from my manufacturer if I want to be able to get them assembled by as many PCB assemblers as possible (i.e. I haven't decided on ...
2
votes
3answers
916 views

Term for/information about manufacturing a non-rectangular PCB?

I’m interested in getting my own low-cost PCBs made for a custom PC keyboard which will have a non-rectangular shape. Something like this shape: I’ve checked the excellent price comparison site at ...
2
votes
2answers
1k views

Gerber File Format 4.5 or 4.6

In Kicad, the PCB layout / schematic editor I use there is an option to export Gerbers in 4.5 or 4.6 format. I can not find any documentation on what this means. Any help would be appreciated.
1
vote
2answers
559 views

Impedance Matching: Distance H is to prepreg or to core ?

I have a doubt about something: Considering a 4 layers PCB where the configuration is as follow: Toplayer / Prepreg / Ground Layer / Core / Power Layer / Prepreg/ Bottom Layer Do I understand well ...
6
votes
2answers
2k views

Should we remove unconnected copper island among connected traces?

Currently designing a PCB I find out there are some copper island. I was wondering if we should better keep them or remove them and why ? Is there any manufacturing risk of having those ?
1
vote
4answers
2k views

What are primary and secondary sides of PCB? [closed]

I am designing a 2 layer PCB with components on both side of it. SMT components are one one side of PCB, but TH (through hole) components are on both sides. I have to go for mass production of say 300 ...
3
votes
1answer
411 views

PCB Design & Debugging Strategy [closed]

I am in the phase of debugging a PCB with several chips on it. I currently realize that during PCB design some strategies for easy debugging later on should be implemented. Personnaly, I just ...
1
vote
2answers
298 views

How to setup Drill Dot Open in single layer PCB using Altium Designer?

I designed single layer PCB in Altium Designer. Now I want to setup Drill Dot open in Soldering layer (bottom layer) to generate Gerber file for the manufacturing purpose. Can anyone help how to do ...
2
votes
2answers
5k views

Combining multiple EAGLE PCBs to one

I made 6 different sensors , unfortunately they are separate designs, and it cots more for production as well. I tested the prototypes and everything is working perfectly. So i dont want to change ...
2
votes
1answer
236 views

PCB Assembly: Specifying Jumper Configuration For Assembly House

I want to send a board off for fab + assembly soon which will include various jumpers in 2 or 3 pin configurations. For example, see this picture below (sorry about quality). I'd like to specify the ...
2
votes
1answer
423 views

PCB manufactored is coated

I'm developing a printed circuit board, and considering I have some traces with 220Vac I'm worried about the clearance. After research, I conclude that these are the requirements that I need to ...
6
votes
1answer
4k views

Are core and prepreg dielectrics interchangeable?

This is a followup to an earlier question. In my experience, PCB fab houses always default to using prepreg and foil on the surface layers. For example, on a six-layer board, the stackup would be ...
4
votes
1answer
503 views

Is the dielectric layer under the top or bottom copper layers always prepreg or can it be a core?

On a PC board is the first dielectric layer looking into the board from the top or the bottom layer of copper always prepreg or can it be a core? Here "can" would mean conventional. If not then why? ...
2
votes
1answer
277 views

printer for mass-production of pcb masks [closed]

I'm trying to find the best way to make a solid photo mask so that I can finally make some excellent PCB's without spending hundreds of dollars. When I bought a lazer printer, the first few prints (...
3
votes
2answers
171 views

Vacuum-drying of cleaned PCB's?

De-ionized water is generally regarded as an effective cleaning agent for PCB's, as shown here and here. However, removing that water means compressed air, oven, and/or lengthy drying-time. Even if ...
10
votes
5answers
3k views

PCB routing T joint alternative

Whenever I come across this situation: I feel a strong urge to make a T - joint like this: However 90 degrees are usually frowned upon. As such what's a better alternative to this T-joint? If I ...