Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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1answer
298 views

Stencil Required for Through Hole Components

I was creating a pcb board that is mostly made of header pins that are suppose to connect to adapters. I was wondering if a stencil is required for soldering through hole components on a bare bone pcb....
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2answers
306 views

Max acceptable resistance between IC ground and PCB ground plane

I tend to be very paranoid when it comes to making PCB's to the point where I try to use 50+ mil tracks for ground wires when routing the board. After, I fill the remaining space on the board with a ...
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2answers
90 views

Mounting a solderless tie point

I have an application where popping some solderless tie points on a PCB is a thing to to. I picked up some 1x4 tie points, https://www.elexp.com/ProductDetails.aspx?item_no=03TB-IVR&CatId= The ...
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1answer
4k views

Why order a laser stencil?

Quick two part question on PCB manufacturing. I am looking to order a prototype PCB and all the manufactures I've gotten a quote from all offer to include a Laser stencil, some charge for the stencil ...
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2answers
514 views

How to decide PCB specification [closed]

Everything is in the title. Let's say I design a PCB layout. It has 4 layers. How do I decide: The material to use for the PCB (difference between FR TG 130, FR TG170, Aluminium, or other materials) ...
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1answer
372 views

How can I add Board Shape to output job in Altium Designer?

When I want to add board shape to final output in output job, I draw board shape on a useless layer and then I add that layer to output job. Is it possible to add board shape automatically in Altium ...
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5answers
2k views

What is the silver strip behind crystal in the PCB?

Consider: I came across a PCB, and I found a silver strip behind the crystal. What is that strip? Has anyone used it?
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0answers
55 views

Printing resist onto paper pcb

Is there a paper that can go into a printer to be used as a pcb? Basically what I'm looking for is a silicon sheet with a thin layer of copper on top that ink can be printed on to be used a resist. ...
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2answers
1k views

Red resin in-between closely spaced PCB pads

Closely positioned components on this one sided PCB have red resin separating solder connections and underneath surface mount components. What is it? How is it applied and why do only some ...
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2answers
432 views

Altium Designer 17.1: importing or copying parameters for 1 project to another at once

Can you please tell me if there is a way to import/copy all parameters (Design>Document options-Parameters) (at once) from other project in which I have already added. Or is there a way to make my ...
2
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4answers
280 views

Choosing a PCB Manufacturer/Assembler for the first time [closed]

I've just finished designing my first PCB, and I'm about to send out a batch of emails for quotes from manufacturing/assembly shops. My design is super simple: the only components are 7 identical SMD ...
6
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1answer
666 views

What influences prepreg thickness?

I only have experience with low-speed boards that are 4 layers at most. I want to get into full-speed USB 2.0 and 100Mb/s ethernet, so I need some impedance controlled traces. Instead of doing ...
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1answer
98 views

Can I order PCB/chip manufacture from provided LOTOS specification?

Is there a way to automatically deduct PCB and/or chip design from formal problem specification of a problem (task) which supposed to be solved on a PCB/chip? I'm currently implementing solution with ...
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2answers
330 views

Inconsistent solder mask on vias

When looking at PCBs in consumer products or PCBs I have ordered from manufacturers myself, I notice that, while many of the vias are covered in soldermask, it seems like a few random vias are missing ...
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1answer
1k views

How to generate Assembly drawing in eagle

Hi all for the production purpose the ems partner asked me assembly drawing of my pcb is there any easy way to create an assembly drawing with part name inside the boxes as in the picture in eagle?
9
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2answers
2k views

Is there a way to make a drill hole only up to half depth of the PCB in Eagle?

I need to solder a through hole ZigBee as though it were an SMD part. The other side of the board is a touch pad so there should not be any solder or components on it. I think it is better if I can ...
0
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1answer
66 views

How connections in a multilayered PCB used to be done?

how each layer works do each of them has an individual task or functioning or all are interconnected to each other beacuse i am confused as when they get fabricated how assembly of components on each ...
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2answers
603 views

Custom/DIY Metal-Core PCB?

I would like to fabricate a slight enhancement over the metal-core PCB's shown here: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6071 Specifically, my application requires 2 LED's of ...
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3answers
248 views

PCB design mistake

I ordered PCB for my prototyping board and I made an inversion about the pin of the microUSB : (If the bullets stand for the pin) Original microUSB : GND ID D+ D- 5V My board : 5V D- D+ ID GND ...
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1answer
159 views

Stencil for PCB etching?

I have been looking into homemade PCB etching, since ordering PCBs takes longer than I would like. I have seen PCB stencils for applying solder paste, and I am wondering if it is possible to use a ...
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2answers
717 views

Difference between single layer and multilayer PCB? [closed]

Please answer my question Difference between single layer and multi layer PCB ?
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1answer
139 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
488 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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0answers
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. ...
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1answer
364 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
103 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 ...
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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 ...
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2answers
336 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
118 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 ...
4
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2answers
381 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
274 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 ...
2
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2answers
8k 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
1k 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
75 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 ...
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1answer
75 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, ...
0
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1answer
124 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
707 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....
2
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2answers
2k 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
524 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 ...
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1answer
412 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 "...
3
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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
119 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
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 ...
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0answers
230 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 ...
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1answer
796 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
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2answers
697 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 ...
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2answers
777 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
389 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 ...