About the manufacturing of PCBs (Printed Circuit Boards).

learn more… | top users | synonyms

0
votes
1answer
51 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 ...
0
votes
1answer
83 views

PCB lab equipment

I was thinking of buying parts to make equipment for PCB production. I have the knowledge and the experience with PCB production from school (about 10 years ago), but I have no knowledge about the UV ...
0
votes
0answers
39 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
votes
2answers
88 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
votes
3answers
706 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 ...
0
votes
1answer
65 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
votes
2answers
82 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 ...
-2
votes
1answer
117 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
votes
1answer
66 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
341 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
51 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
100 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
33 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 ...
6
votes
1answer
186 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
vote
0answers
68 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
72 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 ...
1
vote
1answer
117 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
83 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 ...
8
votes
2answers
381 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
votes
1answer
41 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
votes
3answers
2k 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
144 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 ...
1
vote
1answer
214 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
468 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....
4
votes
1answer
440 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 ...
1
vote
1answer
50 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 ...
5
votes
3answers
262 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
133 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
145 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
votes
2answers
230 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 ...
5
votes
4answers
329 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
156 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 ...
2
votes
1answer
305 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 ...
0
votes
1answer
108 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
votes
1answer
52 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
votes
2answers
53 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
101 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
112 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
votes
1answer
94 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?
3
votes
6answers
933 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 ...
5
votes
3answers
742 views

Good way to affordably manufacture low-quantity PCB?

I am thinking about making an open-source development board for a specific field in power conversion. If there is interest from local universities, I will manufacture a few hundreds of these boards. ...
2
votes
2answers
214 views

Components to avoid using on an ultrasonic cleaner

What components populated on a PCB are not safe to clean in an ultrasonic cleaner? It is not limited, but I specifically wonder below components if they are safe to use or some requires special ...
1
vote
3answers
171 views

Four layer PCB, leaks current on edges

I was testing a four-layer PCB and got electric shocks several times when trying to touch the edges of the PCB. The four layers are: top/+15V/ground/bottom layer. It seems that there are several "...
8
votes
4answers
854 views

Is it always possible to reduce the number of layers on a PCB by making the board larger

I see that a 2 layer PCB is really cheap to prototype. A 4 layer PCB is almost 4x more expensive . I have a design that uses DDR3 RAM where I need to match trace lengths. However I also need to keep ...
1
vote
0answers
79 views

castellated holes size and spacing [closed]

I'm about to create surface mountable module with at least 65 castellated mounting holes but I am wondering about few things: Is there a minimum size for a castellated hole? Is there a minimum ...
1
vote
2answers
139 views

How to etch Double sided pcb?

I am trying to etch my circuit on a double sided copper clad at home. After designing my circuit I took a print on tracing paper and used iron to get the trace on copper clad. When I used iron paper ...
0
votes
1answer
79 views

Is every pad in eagle a via?

Correct me if Im wrong, a via is a hole that join two or more layers in a PCB. I have a PCB design who has the pads to solder but I want solder only one side, do all my pads that are connected to my ...
3
votes
1answer
123 views

Are we still protecting pcbs with wax?

I've just replaced my smoke detector. It was manufactured in 2006 by BRK. This is an ionization-style detector. I took it apart and the track side of the circuit board is covered with a thick waxy ...
1
vote
2answers
390 views

How much space should be left between a PCB's edge and traces and holes

I am designing a PCB for use with an Arduino mega and I am wondering if there is a good rule for how much space I should leave between the edge of the PCB and various items like: traces (ground, 5v ...
1
vote
1answer
157 views

Pastemask. Manufacturing PCBs

after finishing some designs, it is time to manufacture and assemble them. For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...