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Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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Remove Unused Pad/ Via

I want to make remove unused pad/via at inner layer in order to increase area. But I wonder that does it cause problems in terms of IPC Class-III or PCB manufacturing?
123's user avatar
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32 views

How to cover thermal vias in design spark pcb

I am trying to cover the vias on my PCB using the solder mask however when I upload the PCB to a manufacturer's website the vias are not covered. I am using DesignSpark PCB software There is a post in ...
James's user avatar
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Fusion 360 Board Panelization

I'm working on panelizing a PCB designed in Fusion 360. While I'm aware of external tools for panelizing Gerber files, I'd like to explore options within Fusion 360. Does anyone know if Fusion 360 ...
Neil's user avatar
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1 answer
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Is it okay for two pads F.MASK to overlap each other in Kicad

I made a new footprint for XL-0807RGBC-WS2812B based on this datasheet. When I place this footprint in PCB editor the F.Mask for the pads on this component overlaps each other. Is this okay? I assume ...
Steven Smethurst's user avatar
1 vote
1 answer
42 views

IPC-2221 Min. conductor spacing for low voltage? [closed]

May I have smaller spacing than B1 ( say as 0.05mm) at the conduction spacing if voltage between conductors is around 5V? I'm curious that IPC conduct spacing of requirement of 0-15V is 0.05mm, but if ...
wisleep wisleep's user avatar
0 votes
2 answers
86 views

Is it possible to create new footprints and integrate additional components into an already manufactured PCB?

What is the most effective method to do so? I have enameled wire, which seems safer to me due to the insulation. My plan is to cover them with solder mask. However, I have a question: Would it be ...
condor12's user avatar
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1 vote
2 answers
120 views

PCB etching just not working, noob needs help

I am trying to DIY make a PCB at home following this tutorial. There are some problems: I could not order the stuff from the YouTube description because Tools & Materials: -) Photopositive PCB ...
Jonas Frey's user avatar
1 vote
4 answers
160 views

What are these hard black dots on PCB? [duplicate]

I have this LCD from Adafruit. On the bottom side, it has these hard black spots, slightly domed. I'm wondering what they are, and how they are produced. There are clearly traces running to these, and ...
LordTeddy's user avatar
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-2 votes
1 answer
62 views

Where can I find the schematic and CAD files of an open source PCB? [closed]

This is a fairly well known power bank fast charging module which is open source. I am unable to find its PCB CAD files on the internet. Can somebody provide it? Even just the schematic would help.
Sayan's user avatar
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1 vote
2 answers
95 views

KiCAD: remove DNP components from paste layer

We have an adapter board that works as an interface between our own and third-party electronics. Depending on the third-party configuration about a third of somewhat expensive components may be unused....
Maple's user avatar
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8 votes
2 answers
1k views

What is the purpose of exposed copper on certain traces on this PCB?

I recently took apart a DeWalt battery charger. What is the purpose of this particular arrangement of exposed copper on certain traces (mostly on the right side of the image)? These are wide, high-...
dpwilson's user avatar
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Gerber X1 to Gerber X2 [duplicate]

I have gerber files from a client. Their extensions are: .fph, .fpl, .pho, .rep, .drl, .lst, .dxf. Of these, I know .drl are the drill files and .dxf is the mechanical drawing. Also, there is a .fph ...
Rohit Kulkarni's user avatar
0 votes
1 answer
120 views

How do I change minimum anular ring in vias for different layers in Altium?

I want to send my gerbers to a PCB manufacturer but its manufacturing capabilities force diferrent minimum anular ring for vias in different layers. For outer layers, its 0.13 mm and for internal ...
Developing Electronics's user avatar
1 vote
0 answers
71 views

PCB Layout review: ESP-07 with 28BYJ-48 Stepper board

I have used the 28BYJ-48 in conjunction with an ESP8266 in some applications and I thought it would be handy to have pcb made. I want to use JLCPCB including Pick and Place. The Kicad source code is ...
Besi's user avatar
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1 answer
64 views

Soldering with SAC on a glass PCB

I’m having trouble getting the solder paste to wet my glass PCBs. I am using SAC305 solder. Funny that it works fine on FR-4 but with glass it just balls up. Maybe it is because glass conducts heat ...
Eitan Benchabbat's user avatar
0 votes
1 answer
148 views

What should be the minimum number of SMD components on a reel (minimum tape length) for a pick and place machine?

What should be the minimum number of SMD components on a reel for a pick and place machine? Different scenarios are possible for each machine. In terms of professional machines, if everyone writes ...
Electronx's user avatar
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2 votes
1 answer
80 views

Aluminum PCB PTH conducts across the entire board

I've designed plenty of PCBs and had them manufactured using FR-4, but I had never worked with aluminum PCBs and I had been wanting to try it out. So in my latest order of some FR-4 boards, I added in ...
Scott Duckworth's user avatar
3 votes
4 answers
1k views

Can SMD pick and place machine work without a breakaway rail?

I designed a 4 layer PCB. SMD components are on one side only. When I order bare board directly (no breakway rails, no panelization) it costs $100. When I order 20 pieces (there are 2 PCBs in each ...
Electronx's user avatar
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0 votes
1 answer
167 views

PCB design - Routing without a schematic

I am using Altium CircuitMaker to design a PCB. I'm wondering if there's a way to make my PCB design without a schematic. My idea is to simply make a PCB with just pads and populate it myself with the ...
Vagabond4761's user avatar
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1 answer
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PCB Design Process

I'm new to PCB Design so I wanted to clarify a few things about the process. For context, I have already physically made my project on a breadboard. Now I am trying to lay it out on a PCB. I have ...
Vagabond4761's user avatar
1 vote
1 answer
76 views

SMD small footprint problem, extending pads for more solder

I have this component (LTST-FC12WEGBD-5A SMD LED by Lite-On) that has been very difficult to use due to the pad sizes being so small. Below is the footprint. The problem is with the smaller square ...
Ricardo Serrano-Smith's user avatar
2 votes
1 answer
475 views

Can hard gold be selectively used on a PCB in the center of the board?

I have charging pads at the center of the device which makes repeated contact with a pogo pin. I'm concerned an ENIG pad may wear out over time as the user clicks it on and off the charger. Can hard ...
josephbarrymore's user avatar
4 votes
3 answers
673 views

PCB material with high dielectric constant

Typical PCBs have a dielectric with a low constant \$\varepsilon_r\$. I'm studying the effect the electrical fields on dielectrics and as an experiment would like to test PCBs with a very high ...
mabeco's user avatar
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6 votes
7 answers
2k views

Automatic serial number on a PCB

Imagine you're printing 10 PCBs and you want each PCB to have its own serial number, but you want to add the serial numbers automatically from Kicad. Is this possible or not? Does it depend on the ...
Nedou's user avatar
  • 316
2 votes
1 answer
64 views

Different trace/space rules for copper pour than for traces?

I recently ordered a 4/4 mil trace/space board from a new manufacturer who is geared towards very low-cost prototype manufacturing. They manufactured the first board I sent them with no issues. ...
John M's user avatar
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2 votes
1 answer
135 views

Production quality issue?

I had 5 two-layer boards fabricated by a popular assembly house in China and I'm curious what folks thoughts are based on what I received. Here is a photo of the 5 boards which has a red square around ...
Kevin McQuown's user avatar
4 votes
0 answers
59 views

Attempting to patch the "G75 Bug" on a Gerber Level

Context I am currently looking for alternative PCB manufacturers for my company and have sent Gerber files to some (Chinese) companies. These Gerber files have already been used in the past by various ...
Sim Son's user avatar
  • 2,803
1 vote
2 answers
902 views

How to specify the stiffener for ordering Flex-PCBs at JLCPCB

I have a Flex-PCB design that contains several areas that are supported by stiffeners. I am trying to order the PCB at JLCPCB but can not figure out how to specify the areas where the stiffener is ...
Johannes's user avatar
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0 votes
1 answer
68 views

What is the difference between these vias?

I have marked them with red and purple. What purpose do they serve? P.S. I am new to this, so please help me through this.
courageouslywin's user avatar
1 vote
2 answers
178 views

Aspect ratio and different vias width

I've recently been looking into the width of vias, and could use the feedback of more experienced designers. Through-hole vias : I've read that for through-hole vias, the way to go is 8:1 (so if your ...
ArkevWT's user avatar
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10 votes
4 answers
3k views

Why is there white stuff on these inductors?

Why are these inductors covered with white stuff? Is this to reduce EMI/EMC? To reduce of unwanted noise? Whatever it is, please explain it.
Ashu Tamar's user avatar
0 votes
1 answer
92 views

Is it possible to expose dry photoresist film to UV before applying to copper for etching?

I've looked at a couple of resources regarding etching PCBs using dry photoresist film and in each of the methods, the film is applied to the copper before the image is projected onto the film with UV ...
Daniel's user avatar
  • 365
1 vote
2 answers
279 views

Guidelines for component spacing [duplicate]

Are there any standard component clearance guidelines/rules/best practices (for SMD parts)? Or does one have to talk to the EMS every time for all the components' clearance? For example how close can ...
mr dude's user avatar
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1 vote
1 answer
138 views

What is the minimum FR-4 PCB width (not trace width) that can be manufactured?

The figure below shows a single FR-4 PCB that has narrow "bridges" (marked with arrows). How narrow can these bridges be so the PCB is still structurally sound? I imagine that the width will ...
Marcos's user avatar
  • 83
24 votes
1 answer
2k views

Why is there a difference between pad-to-trace and trace-to-trace clearance?

I am looking to have a PCB produced for a personal project of mine. I have to use very thin traces and tight clearances to escape pads on a BGA chip on my board. I was looking at the capabilities of ...
elialm's user avatar
  • 273
0 votes
0 answers
113 views

PCB trace / clearance sizes (why so big?)

I started a new job at a place that runs really high volumes using IPC class2. Before I always did lower volume at class3, so I have uncertainty here and there. All of the boards at the new place seem ...
Steve Scully's user avatar
0 votes
2 answers
95 views

Why are some components missing areas of pour near mounting holes?

Circled in red are component through holes in a copper pour plane that are missing areas / don't have the copper poured completely around the via. Seen on tons of components both through hole and ...
user avatar
1 vote
2 answers
82 views

Blank PCB testing of high current traces

I have a successful PCB design that conducts 10 amps of current at 27.5 volts. (Drives a DC motor) I desire to have my blank PCB manufacturer test the high current traces for manufacturing defects ...
Russell's user avatar
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8 votes
1 answer
634 views

PCB stencil layer for cutout

I ordered a multiple PCBs which all arrived fine. I never included a stencil because of the high cost for it compared to the PCBs. Now I combined a few board designs to fit on a single stencil, so I ...
RektByMemes's user avatar
0 votes
1 answer
44 views

Matching Altium and manufacturing DRC technology

I want to input inside my Altium designer the DRC of a manufacturer shown in the link below. There are some importance settings I need to find but the terminology differs from Altium to designers laws ...
lub2354's user avatar
  • 373
2 votes
1 answer
339 views

Earbuds charging contacts -- surface finish changed after use

In the photo is a closeup of one of my earbuds that I have used for a few years. One of the contact surfaces (to the right in picture) is gold-colored and quite shiny. The other one is more brownish ...
Filippa's user avatar
  • 363
0 votes
1 answer
100 views

Is there a way to create PCBs with very cheap laser module? [duplicate]

I am quite new to electrical engineering, and I want to progress by creating PCBs. Unfortunately, I do not have the budget to buy a laser cutter to engrave PCB boards, so I was wondering if there ...
Gabriel Stan's user avatar
3 votes
2 answers
1k views

Can a 650 nm 250 mW diode laser remove the first layer of a PCB?

Basically I’m trying to make a DIY laser engraver using the specified diode laser, which I’ve seen people successfully engrave more “forgiving” materials such as wood or cardboard. I was wondering ...
Victor Ban's user avatar
1 vote
1 answer
56 views

Electronics Manufacturing Engineers: What needs to meet IPC-6012 the finished copper or the starting copper foil?

I have a PCB that has a finished copper thickness of 1 oz on all layers and must meet IPC-6012 requirements for Class 2. Does this mean that the manufacturer can start with 0.5 oz copper foil then ...
AgentXq's user avatar
  • 111
0 votes
2 answers
210 views

Verification of Gerber file layers

I have old PCB Altium design files and Gerber files. I want to cross check Gerbers with design files. However I'm trying by visually checking, but I know that's not a smart technique to do that. Is ...
Bhushan Waghe's user avatar
0 votes
0 answers
23 views

Matrix Trackpad

I wanted to build a matrix capacitive trackpad. Ideally, its PCB would have 4 layers: 1--> The plate array 2--> The circuit that links the rows (horizontally) 3--> The circuit that links the ...
Andrea Scarpellini's user avatar
8 votes
1 answer
563 views

Pie shaped stubs in RF supply PCB layout

In a recent question there is a photo of a RF PCB And it shows several pie shaped pads on the supply end of the biasing network. How are these pads designed. Is there a rule of thumb for the two ...
D Duck's user avatar
  • 2,216
1 vote
3 answers
700 views

How to create a component in Altium library that has multiple parts/components

Is there a way to create a library component for another PCB module in Altium? For example, let's say that I want to have a footprint that accepts DRV8825 motor driver module (from the picture below). ...
Calculon's user avatar
  • 142
0 votes
1 answer
101 views

Output by variants when exporting Altium 3D-PDF

Yes, as in the title that I mentioned, I finished my project in Altium and the prototype PCBs arrived. I send the 3D-PDF export file to the technician for pick and place operation of the components, ...
Electronx's user avatar
  • 756
0 votes
1 answer
64 views

CircuitMaker generates outlines for internal resistors

CircuitMaker is generating outlines for internal resistors and I think the manufacture will cut holes in those places. The PCB view (top layer) is: The problems are resistors R4, R5, and R1. The ...
Martel's user avatar
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