Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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2
votes
1answer
449 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
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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
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1answer
512 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
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1answer
291 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
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2answers
178 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
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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 ...
3
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1answer
118 views

PCB layer sequencing

I'm designing a 8-layer PCB. Two layers have been reserved for GND and 2 for various digital supply voltages. Remaining 4 are meant for various signals( mostly serial data, video and USB). How ...
1
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1answer
100 views

Choosing a via for automated PCB assembly order

Apologies if this has been asked before - I'm new to the field, and to Stackexchange EE - so route me to relevant posts if some exist. I'm aiming to order PCB assembly from a manufacturer (i.e. both ...
13
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4answers
2k views

Blasting copper off a substrate with a 808nm laser diode- viability

So, I'm working on a way to produce PCBs for small jobs, and I thought that lasers might be a good way to go, as etching seems to be very difficult from small traces, needed for many microcontrollers. ...
0
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0answers
157 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 ...
3
votes
1answer
691 views

What is the pad size required for this BGA AW H3 Chip?

I'm trying to figure out the pad size to use for my footprint according to this datasheet.The last page in the datasheet has the package dimensions. I've also posted the relevant information in a ...
0
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1answer
108 views

General rules to define a part for BOM and Assembly files.

I would like to know if there are some standards or rules to describe parts when generating the BOM or assembly files for manufacturing. For example, I would describe an SMD capacitor with format ...
2
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1answer
3k views

Altium trace length vs signal length

I've seen both of these in the PCB tab when editing the PCB board in Altium Designer.. what are the two? I thought I new, but I have fully routed traces with signal lengths of 0 as well as signal and ...
0
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2answers
561 views

Could electromigration cause a short circuit in a PCB

Is it possible that electromigration cause a short circuit in a PCB? Theoretically due to chemical potential difference between gold and nickel (1.68 V) it's known that metal ions can penetrate into ...
6
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3answers
1k views

PCB cutout specification

I want to specify a square cutout in my PCB, to fit a sensor module. The cutout must be very tight, that is it should only be 100μm wider than the sensor on all sides, as it is used to hold the ...
14
votes
2answers
22k views

How to chose via diameter and drill size based on trace width

I am designing a two layer board, the problem is I do not know how to select via diameter and drill size, as well as outer and inner diameters. In my circuit I use 056, 012 and 006 mil traces: I ...
0
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2answers
287 views

'V' groove routing at cheap PCB manufacturers [closed]

I am designing some PCBs, which I intend to prototype, and then get small volumes produced for personal use at a cheap PCB house such as Itead, DirtyPCBs, or Seeedstudio Fusion PCB. These board houses ...
-1
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1answer
359 views

Can you print a circuit board yet?

Exactly as written. I mean using the techniques of additive manufacture to literally lay down electrically conductive traces and pads using some sort of spray, extrusion, direct transfer, etc. I ...
3
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1answer
181 views

PCB fab and assembly, how to resolve width problem between adjacent pads?

I have just sent off for some pcbs to be fabricated and assembled, I have used this company before for fab but not assembly with no problems a few times. They have just sent back a issue I need to ...
2
votes
2answers
1k views

Non plated through hole to PTH

I have defined Plated through holes on my PCB design.But somehow my pcb manufacturer has drilled it as non plated through hole and PCB has arrived.Now I need a suggestion to convert this non plated ...
1
vote
1answer
275 views

Printing PCBs using conductive paint? [closed]

Has anyone tried to use a programmable cutting machine like a Silhouette CAMEO to cut a stencil for a circuit and then used conductive paint to transfer it to a board? Could that work? What kind of ...
2
votes
1answer
410 views

Is one big PCB cheaper than multiple smaller ones, if so how to do this in Eagle PCB?

I have heard/read somewhere that one bigger PCB is cheaper than multiple smaller PCBs, is this correct? If so, then rather than order seperate PCBs for different parts of a project e.g main board ...
1
vote
1answer
99 views

Create breakout for iM880A-L

I currently need to work with the iM880A-L. As it is annoying and shaky to solder that thing on perfboard and attach cables, I want to create a breakout board with JTAG and SWD plug and pins for all ...
7
votes
2answers
714 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
1
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0answers
439 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, ...
3
votes
1answer
98 views

PCB Design Ruleset

I have just started learning PCB Design (using Altium Designner) and I have a basic question about PCB Rule set. Rule set is defined by the Altium, but can we edit the rule set according to our ...
2
votes
1answer
933 views

Are smartphone PCB designs at the bleeding edge?

I am working on a board design that is near the limits of the PCB fabricator's capability. It uses 4mil stacked microvias, via in pad, blind and buried vias, 3 mil trace/space, buried capacitance (...
1
vote
1answer
705 views

Can I wash my PCBs denatured alcohol

I have denatured alcohol which, according to wikipedia, is composed of roughly: 85% ethanol 10% water 3% methanol 1% aceton 1% pyridine My solution has a blue color. Can I use this as a replacement ...
8
votes
2answers
855 views

What is this “paper-substrate pcb” technology called?

I took apart a broken calculator to show my daughter how it functions. It had a small "traditional" FR-4 PCB mounted underneath the LCD glass, but the pushbutton area was printed on a paper-like ...
0
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1answer
706 views

Converting Altium STP/STL model into solidwork

I need my STP/STL model to be re-captured in the 3D workspace environment from Altium to SolidWorks. Can any one help me on this and can it indeed be done? Norman
11
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3answers
3k views

Is 3D printing of PCBs possible?

I just saw this picture about PCB 3D printing on a website, can it work in real life? It's would be so cool, if it could useful in the real life.
3
votes
2answers
1k views

ENIG or HASL for prototype with small pitch and expectation to need rework

I have a project where I'm about to order the PCB's for a first prototype, and I'm staring at the option of HASL vs. ENIG on the website. I will hand solder it with an iron, the smallest pitch part is ...
2
votes
1answer
4k views

Altium Power Plane Gerber inverted

Good Day I used internal power planes for the first time (Altium), and I now want to generate fabrication outputs in the form of Gerbers. The gerber below illustrates my internal GND plane, to ...
8
votes
4answers
1k views

Placing a mounting hole partially outside the board

I have a board currently 50x30 mm. And I need to have 4 mounting holes on it. Bad news is that I don't have enough space to place them in regular way. Now I made the following thing: I placed four 3....
6
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2answers
6k views

Altium hide component designators in fabrication ourput gerber

As the title says, is there a way to hide the component designators in the fabrication ourput in Altium AD15? I have a very tight board with 0402 parts very close, so there is no room for the ...
2
votes
3answers
266 views

Presensitised-PCB Build Method

After completing many basic circuits on stripboard and premade PCB I've decided to try my hand at making my own PCB. Following some other forum posts this seems do-able but will likely take some trial ...
6
votes
3answers
3k views

How to break apart grooved PCB

I recently got a set of 20 breakout PCBs. I didn't realize that they came in one piece- that they had not been cut apart yet. However, there are grooves between each board that are cut into the ...
1
vote
1answer
812 views

Chamfer the corners of PCB

Almost all the PCBs I've seen for now are right angle. But I think such acute angles are not safe for handing, even when installed on the products, it may do some bad to the wires connecting the ...
3
votes
2answers
692 views

Eagle: PCB layers stack-up and impedance

I had a PCB board with 8 layers to be fabricated. I have used an opensource deign modified it a bit and want to get them fabricated. The PCB company asked me to provide layer stack and impedance ...
5
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2answers
1k views

What is the typical PCB fabrication process in a professional PCB house?

I have been etching my own boards as part of my hobby interest into electronics, and I can't help but wonder how exactly is the typical printed circuit board manufactured? Unfortunately, details on ...
6
votes
4answers
5k views

What type of paper is good for the toner transfer PCB process?

I've been using magazines and it works about half of the time. Thick sheets work better but they are hard to find and I must cut them to size. I'd rather just have something that works so I bought ...
2
votes
1answer
3k views

Proper storage of ferric cloride PCB etchant

I etch about half a dozen printed circuit boards each year at home, using an aqueous ferric chloride AKA iron(III) chloride etchant solution. As I want to minimize the costs and hassle of buying new ...
3
votes
1answer
3k views

Eagle - Oval pad

How to make a through hole pad other than circular shape in Eagle? I need an elongated circle / elliptical sort of pad. This is the best I could achieve: This is what I did: 1) Made polygons on Pad ...
0
votes
1answer
243 views

How to probe traces on a PCB

I have some PCB's that I have ordered from China. The PCB has a BGA component along with traces which go from the BGA component to another BGA IC(USB controller) and finally to USB. Right now I am ...
0
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1answer
100 views

Where can I find some basic information about ICT? [closed]

I'm trying to find some information about the basics of ICT (In Circuit Testing) but having trouble finding anything useful. From the few things I managed to find, I gather that an ICT tester is a ...
0
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2answers
195 views

PCB coating for a high temperature environment

What PCB coating is good for a high temperature environment (my environment is about 30-70 C), and is available in a spray can or so that is easy to implement without need of a device/machine?
3
votes
1answer
480 views

Apply etch resist on copper

I cannot get my toner etch resist on to my copper board. I'm doing with the iron, but each time I try the ink does not transfer completely. I've tried many things - applying some water on it, ...
4
votes
1answer
316 views

Galvanic action on gold plated PCB

It has been always said that having gold plating on a PCB has lots of advantages. Not only does it give a good clean low resistance contact, but the perfect flat surface. However based on the galvanic ...
0
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1answer
967 views

V-cut gerber format

I prepared a panel on Eagle Cad. now I am preparing Gerber files for the production. What device output and file extension do I need to save the v-cut layer?
5
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6answers
5k views

DIY PCB Manufacture: Photoresist or Toner Transfer?

So here's what happening: I have my board layout ready to go on eagle, and am looking for a good way to produce this board at home, of a quantity of about 2 or 3, so not large scale at all. All the ...