Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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25
votes
10answers
3k 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 ...
1
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1answer
44 views

TPS61025 and PCB layout

I'am doing some small IOT device and want to use power source 2 x AA elements which gives ~3V. It should be power efficient, so in schematic included TPS61025 as output requirement is fixed 3.3V. ...
0
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1answer
116 views

What do you keep in mind while branding your PCBs? Design/professional appearance

I've just completed my first PCB and it's safe and well designed. Now I want to put a vector image on the board with my brand's name with it. I was wondering how can I do this, so the art looks ...
6
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5answers
2k views

Cost reduction by eliminating vias from PCB design

I am designing a small (30mmX20mm) and not complicated two layer PCB. It is possible to do the design without using vias. Is it possible to determine how much can I save approximately by eliminating ...
0
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0answers
56 views

JLCPCB Preview shows up differently, is that how it is supposed to be?

I am making a two sided PCB and was going to have it produced using JLCPCB. I made the PCB in Eagle, and this is my first time making it in Eagle (I am not new to PCB making, just the program). I ...
0
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1answer
42 views

1.3mm vs 1.27mm pad pitch on a MOSFET

I have a layout that was done out of house and the pitch of a IC is listed on the datasheet as 1.27mm. The layout service constructed the IC in imperial and when Altium converted the imperial to ...
0
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1answer
65 views

View raw circuit board production files

After ordering some PCBs involving fairly complex milling patterns from a Chinese supplier, I was given the production files and asked to verify that they are correct. However, I'm not sure what ...
0
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1answer
28 views

Minimum EAGLE trace width for PCB etching with glossy paper and a cloth iron

What`s the minimum widht and clearence that's etchable using a photo paper and an iron? I've heard using too small clearence might mess the ink resulting in shorts. I want to have 20V@400mA, will 8mil ...
3
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5answers
13k views

How to convert PDF to Gerber for PCB layout?

I've got a PDF file with a PCB layout I'de like to produce - however, I need the file in Gerber format first. Is there an easy way to convert between the two? I've found this: https://swannman....
3
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2answers
243 views

Bubble etching versus rocker tank

I make my own PCBs and etch them in a homemade bubble tank. The tank has failed after a couple of years largely due to the etchant slowly eating it's way through some of the materials (glues, pipes, ...
2
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2answers
153 views

PCB stackup ambigous percent number

In this stack-up what are those presented in right-side of picture? update: The person who respond from manufacturer told me that is "residual copper ratio". But I think she is misunderstood because ...
1
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1answer
33 views

I cannot select certain parts of my board?

I have been dealing with this issue for the past 3 hours, and have moved nowhere from this. Very frustrating, considering this is a one credit course. My main issue is that I cannot move some of my ...
1
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2answers
146 views

Can I submit bitmaps to be used for PCB silkscreen?

I have an image which I would like to silkscreen on my PCB. It's quite detailed and when I import it into my editor (I am using the easyEDA web editor) the software simplifies it before it imports it. ...
16
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4answers
9k views

Feasibility of PCB edge plating?

How feasible is it to edge plate a PCB or at least a portion of one? I've seen it done but as I understand the outer edge is only cut after plating at most fab houses. Is this something that's ...
0
votes
1answer
184 views

Can resistive traces be created on a PCB?

I'm assuming that copper traces on a PCB have negligible resistance. Is it possible to put a trace on a PCB that has some greater amount of resistance? The amount of resistance would not need to be ...
0
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2answers
103 views

What Gerber File Viewer is This?

PCBWay sent me this image while trying to troubleshoot my circuit board file content not showing up. I want to know if this program is available so I can download/buy it to troubleshoot my output ...
0
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0answers
34 views

Via in pad, What pad to via ratio requires fill and plate?

I am making a board similar to an Arduino Nano 33, with some fine pitch SMD components that effectively require via in pad to route out... I can not determine if Arduino is capping their vias, or ...
1
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1answer
121 views

Accidentally Pasted Beyond Origin in Altium

I'm new in Altium and I accidentally pasted some pads and components(the ones at the bottom corner) from another pcb file but I wasn't aware of it at first because it didn't show on the sheet on the ...
0
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0answers
26 views

Converting Proteus .GBR file to the more conventional Gerber extensions

I am using a panelizer program used in this video. unfortunatly upon adding the gerber files to the program the program doesnt seem to draw the body in the viewport. This lead me to believe that maybe ...
0
votes
1answer
76 views

Programs for editing Proteus gerber files to panel PCBs [duplicate]

I am in need of a program that lets me edit gerber zip file. I have several PCB to be sent to JLCPCB but individually ordering them will cost me quite an extra (30$). Although that may not be much to ...
1
vote
1answer
87 views

PCB electroplating then etching

How can I protect the through holes copper which is electroplated from being etched away by the ferric chloride? Is there a resistive solution or it`s just the conductive ink.
0
votes
1answer
116 views

Circuit/schematic review ATMEGA328P

Could someone suggest a place where I could request people to look over my schematic/board design? If this is the place, here it is: https://easyeda.com/be.mihai22/project-hawk EDIT: As I see ...
4
votes
3answers
3k views

PCB opaque coating for anti reverse engineering?

Im trying to find a coating for my PCB in order to protect it from reverse engineering. I want it opaque, non-conductive and with a low thermal resistance. Basically I do not want that someone ...
0
votes
1answer
41 views

How to delete graphics from PCB board view in Eagle?

I am making my first PCB, and I have a numpad and a 16x2 LCD in the schematic. When I go to make the board, it also brings in the graphics along with the pins, but I will not be soldering them ...
5
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3answers
1k views

Cut 3D chunk out of PCB?

I would like to cut a small square out of the middle of a large square PCB. The tricky thing is, I don't want to cut all the way through the board, just about half way. This would create a 1mm-deep ...
0
votes
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. ...
0
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1answer
73 views

Help me find the best PCB design and why that is the one?

From the worst to the best design due to impedance parameters that affect the signal i would do it as a) > b) > d) and c) because c) is the one with the lowest lenth and lowest curves, am I right? ...
0
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0answers
50 views

PCB Toner Transfer Method - How to remove toner when it fails before etching?

I am trying to do a PCB toner transfer, however sometimes the transfer is imperfect and the really small traces fail so I would like to start over and reuse the board again instead of etching it. I ...
0
votes
2answers
80 views

How to remove schematic reference information in Altium Designer?

I want to remove the schematic reference information for a pcb component. How is it possible? To clarify I do not mean reference designators 'R1', 'R2', 'C7' and 'IC1' for example but part ...
1
vote
2answers
162 views

Reasons for using no conductor finish on PCB

Some PCB manufacturers, such as Eurocircuits or PCBWay, offer the choice of no conductor finish (vs ENIG, HASL, Immersion Tin, OSP or others). Since this option is not often chosen, it raises the ...
3
votes
1answer
44 views

What is minimum trace width for “advanced” fab shops and what are possible manufacturing/reliability issues?

One of fab houses suggested stackup with 2mil traces. Given that this is their stackup so they must be feeling comfortable with it and SI performance aside - are there any reliability/...
0
votes
2answers
73 views

How to determine vias and through holes from 4-layer Gerber files

I'm trying to understand the difference between the vias and plated through-holes in these reference Gerber files. On layer 3, I don't understand why there are so many holes (vias)?. Why are some ...
8
votes
2answers
256 views

Black Pad. Will heat remove the gold from an ENIG finish?

I have a batch of new PCBs with ENIG (electroless nickel / immersion gold) surface finish. My assembly house has had two unsuccessful attempts at populating the boards. We're trying to troubleshoot ...
37
votes
10answers
11k views

Do dead weight 'components' exist?

After making a prototype circuit board, I usually glue four rubber pads/bumpers to the bottom, to keep it stable on my desk: Unfortunately, my boards are usually too light. When connected to a few ...
1
vote
2answers
335 views

KiCad: “No footprint for automated placement”

I just finished my first PCB with KiCad. Now, I need to produce it and I need the Pick and Place file. When I try to generate footprint position files the software produce the message "No footprint ...
10
votes
5answers
8k views

Why do some PCBs have the courtyard in the silkscreen layer?

I've seen quite a lot of PCBs which have the passive components outlined all the way in their silkscreen. Something like this: Here there is an outline around each passive which goes (almost) all ...
2
votes
1answer
83 views

What does this fabrication rule do?

Does the part that says, "Plate Through Holes with copper, 0.001" thick min" mean that 0.001" hole plating will be applied to all plated holes? I am new to the fabrication process and I am wondering ...
21
votes
3answers
28k views

Mounting hole on a PCB

Here is a picture of 3 mounting holes on three different PCBs. The red one is what I prepared on Eagle CAD and used "hole" button on the left side menu , something like this: Do I need to use "...
3
votes
1answer
168 views

PCB etching not working: everything etched

I tried to etch a PCB with the photoresist method, using sodium hydroxid as developer and ferric chlorid as etcher. I think the problem is in the development phase. Although reading a lot about ...
3
votes
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. ...
4
votes
2answers
673 views

How safe is using non-RoHS parts?

I was wondering the safety of using non-RoHS parts for hobby projects. I already use non-leaded solder, but some of the parts I have are not RoHS compliant. How much would I, and my family, be exposed ...
0
votes
1answer
80 views

PCB strip from manufacturer

When we manufacture certain PCBs, where 50ohms impedance matching is required the manufacturer provides a small PCB strip along with the actual PCB. What is the actual purpose of this?
0
votes
0answers
26 views

How do I design a circuit with overload and shortcircuit protection for a multi-usb type c powered hub only?

I am planning on getting a number of raspberry pi 4, for now we will say room for 5. They have usb type c connectors on them, and can receive 5v at 5 amps. Therefore the total amps is 5 ports * 5a ...
84
votes
6answers
6k views

Looking for circuit board material that can be dissolved

We are working on a product where the entire device needs to be dissolved in liquid after the device has operated and the device is no longer usable or desired. This is a down-hole application. The ...
2
votes
3answers
229 views

How do I reduce cost for a circular PCB shape?

I'm designing an electronic product that has a circular housing. There needs to be a PCB inside this form. In order to reduce costs as much as possible for high volume production (5K-10K), what shape ...
5
votes
2answers
933 views

GND plane and vias on a two layer PCB

I'm trying to build my first two-layer PCB layout using this example schema: I'm using SMD elements, which I would place on the top layer. Also I would create a ratsnet area as GND on the top layer. ...
0
votes
3answers
51 views

What does Construction and Standard/Alternate within the PCB Fab Industry?

In the Constructions Column, it indicates AxB. By the looks of it, B is referring to the woven glass material.See pg 7. What is the A in Constructions (AxB) and why would anybody care ? What does ...
28
votes
6answers
17k views

High PCB copper thickness: What are the pitfalls?

We need to carry high currents on a PCB (~30Amps sustained), so we are likely to order our PCBs with high copper thickness. So far we've only used 35 microns (1 oz) in our designs, so 'high thickness' ...
7
votes
2answers
788 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 ...
2
votes
5answers
261 views

Review PCB Design

I've created a PCB design for the first time ever, but I would like to know if I've made any mistakes that will result in a broken board or short circuits in the near future. I've encountered people ...

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