About the manufacturing of PCBs (Printed Circuit Boards).

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60 views

Correcting printed PCB (add a via)

This board is a prototype for the project and is for testing. It is missing the soldermask and silkscreen layers, so correcting mistakes is very possible. The board was printed correctly, but somehow ...
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1answer
84 views

FR4 measurement tolerances

I am going to get a PCB produced, but was wondering how the FR4 thickness measurements work, i.e. how thick are 1.6 and 0.8 FR4, in millimeters, to a few decimal places?
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1answer
98 views

How can I quickly build PCB prototypes? [duplicate]

The development cycle of the company I work include building alfa prototypes, sometimes in breadboards, and beta prototypes in printed circuit board assembly. A considerable slice of the development ...
3
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1answer
138 views

What are the steps for a beginner to electronics to get custom PCBs made for a simple adapter?

I need to make an adapter between two 14-pin board-to-board connectors, one being a MicroMatch and the other being a JMC. What is the most straightforward way to get a PCB designed and ordered so ...
0
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1answer
94 views

gold finger plating needed on prototype board edge connector?

I am making a PCIe card and will be ordering prototypes. I know that in my production cards I should order hard gold plating on the edge connector. Can I skip this plating on my prototype cards to ...
2
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2answers
360 views

Altium Designer: How do I scale the output gerber file generated by Smart PDF into 1:1 ratio?

I'm trying to export a PCB layout PDF from Altium Designer 13.2.5. When my PCB design is open, I click Menu > File > Smart PDF... to open the PDF generation wizard. Throughout the wizard, I do the ...
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0answers
113 views

KiCad: Component outline on the soldering pad - will it disturb the soldering process?

Lots of KiCad's SMD components (including capacitors and resistors) print the component outlines over the solder pad. The pictures are shown below, please notice C25-27, R5-6 and D2-3 PCB design ...
2
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1answer
306 views

How to add Mouse Bites or V-Groove to PCB In Altium?

I know mouse bites are more used to snap off one of many of the same boards in a panelized array, but I'm hoping to put mouse bites to snap off part of the same board if that's possible. Is there ...
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3answers
119 views

Preventing corrosion of copper PCB tracks

I do DIY PCB with the following steps: ...
3
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1answer
78 views

Defining a flex bus in Eagle

How does one go about creating a board file for a board with both "normal" PCB material, and flex materal? I have a project where I want the PCB and a flex bus to be seamlessly joined, like: ...
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3answers
2k views

What is Copper Thieving and why use it?

On many boards I've seen, there are little copper dots used for the purpose of "Copper Thieving". They're small round copper dots connected to nothing and arranged in an array. Supposedly they're for ...
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2answers
96 views

Will MG Chemicals Positive Developer 418 Develop pre-sensitized circuit boards?

I'm trying to find a cheaper alternative to the Datak stuff ($18 for 4oz!), and I came across this (MG Chemicals 418). I'm wondering if it will work with the pre-sensitized Datak boards I'm using (ex ...
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54 views

.PCB view from protel 1.5

I have some .PCB files created through protel 1.5 and advanced pcb when I had win98. How could I see or convert my files now on Win8. Any suggestion?
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1answer
93 views

plated through hole file?

I'm designing a new product and my manufacturer can't continue with out a "plated through hole file". They say that I didn't put it in the gerber files. How do I generate this in ultiboard? Or any ...
4
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3answers
172 views

Is a 1.0 mm thickness for a 4-layer PCB recommended or even common?

I just learned from the websites of a couple of board manufacturers that they can go as low as 0.8mm on a 4-layer board. I think going to 1.0 mm (instead of my standard use of 1.6 mm) would be ...
1
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1answer
58 views

how to understand a positiveresist PCB developed enough

I have a positiveresist PCB that I exposed the board to UV to transfer a layout for 5 min. I use UV box that I bought from Mega UK. After that I put the board onto positive developer. As I did not ...
2
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0answers
73 views

How long does developer solution last within its bottle

Originally I was going to just use UV exposure method but the boards tend to be expensive. Now that I've invested in a laser printer I can do toner transfer which I find much much easier/ more ...
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1answer
66 views

layout transfer to epoxy resin via UV light

I have an epoxy resin PCB board, inkjet transparent film, photo resist developer (Natriumhydroxid), and UV box. I printed the circuit layout onto the transparent film and cleaned the PCB's surface. ...
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1answer
89 views

how to print a PCB layout for UV etching

I am new to UV etching. I have a 2 layer PCB layout that I prepared on Eagle Cad. I am confused what layer do I need to mirror? After printing the layout what side of the paper turns to the UV light ...
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0answers
86 views

Solder stop mask and tinning sequence

Is it recommended to tin PCBs before applying solder stop mask or should I apply the solder stop mask to the PCB and then apply the tinning? Would tinning before applying the solder stop mask be ...
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2answers
520 views

Non Plated Through Holes in Eagle

I am thinking about a project that has need for various different complicated wiring connections. I would like to make a single board that would make it as easy as possible to make arbitrary ...
0
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1answer
58 views

Double sided board w/ d2paks, solder paste?

Can you use paste on a double-sided board w/ d2paks on both sides? There is a small area below the tab but it seems like not really enough room for paste. If not, then how the heck do you do a double ...
4
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2answers
165 views

How to specify castellations in gerber files

I am making gerbers where I want one edge of the PCB to have castellations ( plated half-holes) on the edge. What is the safest way to specify castellations in the gerbers that will ensure that: ...
2
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2answers
293 views

Drill files from Kicad for PTH and NPTH

I have a board in Kicad that uses a mixture of plated and non-plated through holes. It generates two drill files for these. However, manufacturers seem to expect only a single file. If they don't ...
9
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1answer
256 views

Using a via to strengthen surface mount connector on or near pad

I am trying to design a board that has a surface mount connector. I was shown a picture of an example board that has vias on the pads of the connector. I don't believe the via is for connecting to a ...
8
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4answers
304 views

An easy method to align a two layer PCB

When I prepare a double layer DIY PCB using Press-n-Peel I have a problem aligning the bottom and top layer so that the holes and vias match on the copper between layers. Can you suggest any easy ...
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1answer
113 views

PCB layout toner transfer - ink printer

I use iron to transfer toner to the copper board, and have been using laser printer. I saw some discussion on the net that it is also possible to use use ink printer if the ink is a good quality. I ...
2
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1answer
81 views

Determining the best UV exposure time

I would like to manufacture DIY PCB. I am planning to make a UV box like on this link, then I wonder how I can determine the best UV exposure time? or if I use the Sun as the UV source, how I can ...
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1answer
151 views

am I on the right path to fabricating a pcb for my robot

So I'm a software engineer with the dream of wanting to build some cool robots and understand electronics as a result. I'm currently hacking with a raspberry-pi and arduino, but mostly I'm trying to ...
0
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1answer
187 views

How to use HDL designs in hobby circuits and how to do transistor level tuning [closed]

Please excuse the noobness. What is the process a lone (or few) individual can send an HDL design off to a fab (tools, file formats, potential fabs)? I have played around with FPGAs but I'm curious ...
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2answers
335 views

PCB boards: Epoxy resin vs Epoxy glass

I see these PCB material types often: FR4 epoxy resin, FR4 epoxy glass. I see epoxy resin is cheaper than epoxy glass (at least the price that I see from couple suppliers). I wonder if there is a ...
5
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3answers
537 views

PCB drilling - drill bit material selection

I am planning to buy a bench drill (something like that one) to make small hole, 0.5-1.0 mm. I recently used a Bosh drill and 1mm steel drill bit to make a hole on a FP4 fiberglass board, but the ...
4
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2answers
187 views

a good way to detect disconnections on the PCB traces

I make home-made cheap PCBs (I use toner transfer, then acid etching method now, but I might use UV etching someday). I wonder what is the best (and cheap) way to control if there is no problem on ...
6
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2answers
180 views

How to route signals across to a breakoff tab?

I have a small circuit board that will be paneled with a breakoff tab that allows for easy handling during assembly. Currently we just V-Score the square breakoff tab, but we're trying to find a way ...
23
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9answers
1k views

What PCB fabrication methods for *prototypes* are used by professional engineering departments today?

Ten years ago, I worked at a small engineering department within Philips Semiconductors that prototyped all designs before getting them professionally fabricated outside. The method was pretty ...
8
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1answer
178 views

Are there compliance problems with selling products with exposed PCBs?

If I were to go to mass production with a consumer product is there a good guide on making sure I was following the correct compliances so that stores would accept selling it? For example can part ...
3
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1answer
224 views

Non-round through hole issues for Micro USB

I'm on a project where a microUSB connector seems to need a bit more mechanical strength than a surface mount, so I'm looking at through hole receptacles. The pic is of a Hirose part, bottom of page ...
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4answers
427 views

Software to design a 2-sided PCB with discrete components [duplicate]

I'm quite new to PCB Fabrication. I have a circuit with discrete components on a breadboard. I would like to fabricate this circuit into a 2-sided PCB containing discrete components. Something like ...
7
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5answers
877 views

Home made PCB etching problem

I just tried to make my first PCB at home, but it did not work. I don't know what went wrong, so I'd appreciate some advice. I was using the photoresist method, so I printed my circuit on a ...
2
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1answer
190 views

PCB vias impact in cost

Often times I read comments/recommendations about placing lots of vias for GND in 4-layer designs, as well as a line-up of vias surrounding the board to protect from EMI, etc. I was always under the ...
4
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1answer
562 views

Heat Sink for SOT223

I am designing PCB a in which I am placing a BSP296 N-channel MOSFET, for switching solenoids: MOSFET supply voltage is 24V MOSFET max power dissipation is 1.8W Max operating temperature is 150°C. ...
6
votes
1answer
221 views

How are these pcb pads made?

We want to design a pcb module that should be soldered directly onto customer pcbs (exactly like ICs ect.) I found a module which does exactly that, please see pdf. ...
11
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2answers
367 views

How paint an electronic circuit?

I want to make a electronic circuit more hidden. So, I want to make it all black. The easy way is get a spray ink and use it. But will it work? Which ink or paint I can use?
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2answers
271 views

Where can I order flexible PCBs? [closed]

Question Where can I order flexible PCBs online? Does such a service exist form which I can order complete flexible PCBs with components already soldered down? Where? Background I'm in the ...
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1answer
197 views

Eagle 6 : Problem Importing Custom Parts

Recently started working on a new PCB board for a dev kit. I ran in an issue where I had made a custom part for the M50-3501042 2x10 male header with 0.05'' (1.27mm) pitch. Note also that this is a ...
3
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0answers
292 views

How to cut PCB? [closed]

This is actually an answer to a thread that was recently "protected" before this answer could be posted. I've tried various saw blades on FR-4 but it dulls them too quickly. A hacksaw works but I ...
1
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1answer
126 views

Gerber file edits

I'm making my own PCBs at home and I'm using KiCAD to layout the boards and create the Gerber files. From the files I'm making my template which I transfer to my boards and then finish the etching ...
22
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1answer
732 views

Why is “silkscreen” called that way?

Why is the set of white labels on a PCB called the "silkscreen"?
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1answer
100 views

Home made PCBs - chemical temp questions

I'm trying my hand at making my own PCBs. Using the positive photo development method and ammonium persulphate for etching. Does anyone know how long the etchent can be kept once mixed before it ...
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0answers
228 views

How are the prepreg & core selected for a 6 layer (1 oz each) and 93mil PCB thickness?

I would appreciate your help. How is defined the number of prepreg and Core dielectrics for a 6 layer (1 Oz each) and the total 93 mil tickness of the PCB?