Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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2answers
784 views

Difference between single layer and multilayer PCB? [closed]

Please answer my question Difference between single layer and multi layer PCB ?
2
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1answer
142 views

Does fast one-day prototype manufacturing exist (with components, etching and pick and place under one roof)? What is the fastest possible? [closed]

We have different prototyping assembly houses, but cycle times are so long that engineers need to work on 2-5 projects in parallel. The typical prototype assembly process is: one day order process, ...
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3answers
773 views

Why solder paste is not popular and seems almost illegal? [closed]

Once I found out you can use solder paste to assembly at home I was shocked. Think about it, any hardware startup build a pcb, its cheap, then you get it and you want 5-10 copies, and you also have ...
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1answer
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. ...
1
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1answer
430 views

PCB trace routing trick: how safe is it? [duplicate]

In a 2 layer PCB I routed some tracks under unused pins of a MCU to avoid GND polygon crossing, and also saved few vias. For example, using this trick 2 SDIO traces on the left were routed nicely ...
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2answers
106 views

can 2 3mm leds fit within a 5mm bi-color led without bending wires?

After creating a circuit calling for a bi-color common-anode LED, I checked places for stock, and to my dismay, all they wanted to sell common-cathode bi-color LED, but the funny thing is I can order ...
2
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2answers
1k views

What is the general rule of thumb regarding UL's creepage clearance regulation?

I've read a whole bunch of material but I'm still quite confused regarding creepage clearance, specifically: How to calculate the minimal clearance on a PCB board? How to calculate the width of the ...
3
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2answers
369 views

How to create documentation layer at PBC at home

I am making my own PCBs at home with printing on laser printer. Creating copper layer and non-soldering pads is easy, but I would like add documentation layer too and now I am stuck. How do you solve ...
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1answer
3k views

Which minimum tracking/spacing size is actually required for a 0.2mm gap between LQFP leads?

I am uncertain as to the manufacturing specifications that I will need for a PCB I am hoping to get produced. The most complex component is the MCU (STM32151RCT) which has a recommended footprint for ...
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1answer
141 views

Second Reflow with BGA

For a DIY project BGA reflow soldering is really expensive to get it done by commercial means. I approached a university which allowed me to avail the help of their staff but they said they would only ...
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2answers
408 views

Good practice when designing a PCB and stencil?

While I generally use nothing smaller that SOIC chips or 0603 passive components, I have to design a PCB with a WSON-14 IC with tiny 0.5mm pin spacing and with an exposed pad. While I generally use a ...
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4answers
277 views

Checking PCBs for functionality [closed]

I was wondering, do there exist any service that will check to see if your PCB, based upon a schematic / board layout, will work when built? EDIT Thank you for all of your answers. To clarify ...
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2answers
10k views

A confusion on using PCB copper pour

I have a two layer PCB. The bottom layer is mostly ground tracks and some signal tracks. The top layer is signal tracks and power tracks. I want to pour copper ground since it helps noise issues and ...
3
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2answers
2k views

Which surface finish for edge connector plating to increase number of mating cycles with sliding spring contact?

I'd wish to insert a small 12x33mm PCB into a USB slot multiple times a day. Because of that high number of expected mating cycles, the surface finish of the edge connector should be chosen wisely. ...
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4answers
2k views

What's an Air Gap Layer in a PCB?

At work I've inherited a multilayer PCB design that I need to send out for quote and eventual fabrication. It contains two inner layers that are labeled "AIRGAP". What is the purpose of these air gap ...
2
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1answer
93 views

Can I use the toner transfer tecnique to transfer the silk side to the pcb?

I have searched for a while information on how to put the silk side on the pcb ( without using an marker ) I have made an pcb with the toner transfer technique: You print with a laser printer over an ...
0
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1answer
86 views

Time required for toner transfer vs UV light for manual PCB fabrication

Me and my group mates is currently on our planning stage of our design project in the fourth year of our program. We are going to make a direct sketch to PCB printer using CNC. I just want to ask, ...
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1answer
134 views

Solder paste for stencil

I'm going to solder a small pcb with reflow process and I'd like to use a stencil for that because the components are too tiny for hand soldering iron. The pcb has a QFN32 (0.5mm pitch and exposed pad)...
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2answers
858 views

PCB design: vcc plane and via limitations

I'm newbie in PCB design and I'm trying to achieve my first 4 layer pcb. Inner layers are gnd and vcc planes filled entirely with copper. My default trace/spacing is 0.1mm/0.1mm and drill size is 0....
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2answers
3k views

PCB design: safe clearance between via and ground or Vcc inner plane

I'm new to PCB design and I'm trying to achieve my first four-layer PCB. Inner layers are GND and Vcc planes filled entirely with copper. I need to use a via to wire a USB signal (tx, rx) from the ...
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1answer
625 views

PCB design for alternating current and direct current on one big fr4 sheet [closed]

I want to design a PCB dimensions Lenth= 1mtrs., Breath= 0.5 mtrs. and Thickness= 0.01 mtrs.For alternating part my load will draw maximum current of 25 amps and for DC purpose maximum drawn current ...
0
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1answer
461 views

Can a Laser Engraver be used to develop PCB with photoresist?

I'm building a simple laser engraver/cutter following these instructions: http://www.thingiverse.com/thing:1780556 Now my question is: can I use the laser light on the PCB photoresist instead of "...
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3answers
2k views

PCB Home Made Keep Inkjet Or Buy Laser

My inkjet is about to run out of ink and I'm thinking of buying a laser printer to print the transparencies. General process: 2 prints of PCB cut aligned and glued to each other > Pr-Sensitised ...
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0answers
130 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
69 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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1answer
863 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 ...
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2answers
883 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
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2answers
848 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 ...
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2answers
552 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 ...
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2answers
238 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
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1answer
490 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
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1answer
163 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 ...
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3answers
883 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 ...
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2answers
512 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 ...
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3answers
432 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 ...
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3answers
297 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 ...
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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
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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, ...
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1answer
102 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 ...
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2answers
2k 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
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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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2answers
1k 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 ...
3
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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
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1answer
360 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 ...
6
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2answers
968 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 ...
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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?
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2answers
187 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, ...
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2answers
119 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
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1answer
940 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
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3answers
807 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 ...

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