Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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60 views

How are PCBs with castellated pins arranged in a panel?

Can anyone please describe to me how PCBs with castellated pins are arranged in a panel. My understanding is that castellated pins are formed by drilling the edge of a PCB then plating, similar to a ...
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2answers
178 views

Rigid-Flex PCB Fabrication: Window opening vs slot opening

We had issue with one of the rigid-flex design cracking at the joint of Rigid and flex intersection. It is important to note that this is second batch of same PCB and PCB was not cracking in first ...
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1answer
75 views

First Hands-on PCB

I want to print a board from open-source hardware found here. I don't know how to go about filling in the specifications on the website. It may look so straightforward and direct, but I don't have ...
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0answers
32 views

TinkerCAD schematic to Eagle for PCB design

I am new to the world of PCB design but I am having a hard time trying to convert my .brd file from TinkerCAD to Eagle. I've been following this tutorial for my conversion needs but it's almost ...
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1answer
33 views

Issues with PCB exports to Gerber and no/incorrect trace width

I've been trying to make a double layered PCB for a robotics project for a while now using Autodesk Fusion 360. It's going to be the control board for the project, containing an ESP32 together with ...
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2answers
122 views

What happens if I don't tin my DIY self-etched PCB traces?

Once I etch my PCB from copper-clad FR4, do I need to tin the board with solder? If I do not tin the traces, what are the possible issues besides greening over time?
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1answer
182 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 ...
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3answers
2k views

How can I deal with crossing wires when designing a PCB?

I'm finally dipping my toes into PCB design as I got around to finishing up my schematic for an upcoming project that I'm working on. If it helps in finding a solution to my problem, this PCB will ...
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1answer
51 views

Routing Differential Lines vs PCB Fabrication Constraints

I'm in front of a big question. I need to route 90 Ohms differential lines for a USB 2.0 Project. I understand how to use tools like Saturn PCB Design to give me the correct spacing and lines width. ...
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1answer
70 views

Nixie tube project

I just got into Nixie tube clocks. I researched and found all the resources for the project (datasheets, models for Eagle/Fusion 360, etc.) I designed a schematic as well as the board. The parts cost ...
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2answers
120 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 ...
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0answers
72 views

What tools can I use for PCB making at home?

I want to create my own PCBs for prototyping and hobby purposes. I have experimented with buying them in China, which is cheap but not very fast. No idea on the quality either, but for $5 for 5 boards,...
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31 views

Help identify flexible angled pin component

Please help me identify these angled flexible pins in the center of this ESP-WROVER programming board. I'd like to add them to my custom boards so I don't need to solder in the ESP32s. What is the ...
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53 views

Trying to order quality PCB with edge connector / gold fingers

I am not an expert, and maybe even specialist, in PCBs and the ways they are made. Was ordering PCBs for 5 years from single supplier in China, was relatively happy about pricing and quality. However ...
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0answers
32 views

How to place a plated slot on a mechanical layer in Proteus 8 PCB Layout

I need rectangular PTHs on a board that mounts to three tabs which serve as structural support as well as electrical termination (the enclosure and tabs are out of my control). I followed the advice ...
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2answers
290 views

Vacuum-drying of cleaned PCBs?

De-ionized water is generally regarded as an effective cleaning agent for PCBs, as shown here and here. However, removing that water means compressed air, oven, and/or lengthy drying-time. Even if all ...
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1answer
51 views

Does the cost of an ENIG-finished PCB depend on the surface area of the exposed gold at a large scale?

At very large quantities (>100k-1M), does the cost of an ENIG plated PCB increase as the surface area of the part exposed to gold increases? Intuitively it would make sense, as more gold would be ...
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0answers
67 views

PCB manufacturing - Why etch resist such as Tin is removed after the etchant has removed the unwanted copper

Alright so I'm learning the PCB manufacturing process. I have seen many professional PCB manufactures use "Tin" to be used as an "etch resist" which protects the copper traces ...
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2answers
2k views

Fiducial marks: Do they need to be a pad or is it okay if I use the top silk layer?

I have been advised by a more experienced engineer to integrate fiducial marks on my designs for P&P automatic assembly referencing, but he didn't say how to do it exactly. I googled it, and I see ...
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3answers
1k views

What exactly makes small quantity PCB production costly compared to large quantity PCB production?

The per-PCB cost of manufacturing a small number of PCB is 10 times or more compared to the per-PCB cost of manufacturing a large number of PCBs. So what is it exactly that adds to the cost? People ...
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1answer
76 views

Tiny PCB fiducials?

I'm designing a PCB with a size of 25x14 mm that will be panelized. Looking at IPC standards it seems 1 mm diameter fiducial, plus clearance and SM opening is the smallest preferred size. I have ...
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1answer
37 views

Electroplate a circuit onto fr4?

I've been looking into making my own pcbs and was thinking I may try printing the circuit on to the fr4 with carbon and electroplate the circuit on. After a while on google I havent found any info on ...
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4answers
3k 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 ...
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0answers
31 views

Six-layers Stack-up PCB

Here is a screenshot from my 6-layer Stack-up board with this order (signal-GND-power-signal-GND-signal). But I am curious if this is the best arrangement for layers, is it better to swap between L4 ...
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1answer
49 views

tear drops disappearing during mirroring in altium

I have recently faced a problem...whenever I mirror my pcb by using the shortcut>>M+i all of the tear drops which are defined in my design will be disappeared! does anyone know why this problem ...
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0answers
79 views

Why did the liquid tin evaporate off my board when soldering?

On the weekend I designed and etched a tiny little 12V booster circuit for an OLED. To prevent the traces from oxidising in the future, I removed the leftover ink after etching and placed the board in ...
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6answers
330 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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0answers
13 views

What is the impact of a lower TG for an RF Board?

I have a board that contains a WiFi module (2.4GHz). Does Tg have an effect on RF performance in any way ? If the material can satisfy the other constraints, such as Dk, Df etc.. would the Tg be a ...
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2answers
7k views

Combining multiple EAGLE PCBs to one

I made 6 different sensors , unfortunately they are separate designs, and it cots more for production as well. I tested the prototypes and everything is working perfectly. So i dont want to change ...
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1answer
81 views

KiCAD - Design rules for fabrication boardhouse [closed]

This is my first time designing a PCB with KiCAD. I plan to send them to JLCPCB for assembly. There are a ton of parameters to be set like track width, via width etc. If these are set wrong, then the ...
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0answers
31 views

About hole diameter size, tin diameter size and solder mask diameter size for pad of through hole components in Altium PCB design

Is there any rule that relate the tin diameter size and solder mask diameter size with the hole diameter size for the pad of through hole components in Altium PCB design?
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2answers
82 views

Board Assembly double sided vs single sided

I am willing to manufacture a PCB from China, but I am wondering how much the cost will be deference between double-sided or single-sided assembly, rough estimation will help. Thanks
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1answer
721 views

PCB manufactored is coated

I'm developing a printed circuit board, and considering I have some traces with 220Vac I'm worried about the clearance. After research, I conclude that these are the requirements that I need to ...
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0answers
40 views

How to Design method to Program & Calibrate a Panel of PCBs

I'm designing a sensor-package PCB which needs to be programmed and calibrated while still in a panel of 10. I'd like to avoid a large bed-of-nails type setup for this step so that the panel can ...
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5answers
756 views

Securing mod wires to PCB

I have done a few mods to a PCB with 36 gauge mod wire. Obviously this wire is so thin that it only takes a few bends back and forth to break it. What is the best way to secure this in place on the ...
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3answers
831 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 ...
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3answers
13k 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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1answer
138 views

FlatCAM black plotting area problem

I am trying to learn to use this software called FlatCAM that converts gerber files into gcode. The problem is that my plotting area is completly black, and when I open the gerber files, I don't see ...
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2answers
4k views

Can I clean PCB using petrol?

I was advised to clean PCBs using petrol if alcohol is not available. I have tested doing it. Petrol and isopropyl alcohol both work good on PCBs. I have also tried with acetone but it makes white ...
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0answers
42 views

Does PCB positive photoresist and related chimistry deteriorate over time (without usage)?

For creating PCBs, I use the following process: Project the layout on a PCB (with a pre-applied positive photoresist layer) Reveal the mask with sodium metasilicate pentahydrate saturated solution ...
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1answer
38 views

Via in Pad (Does Via Count Affect Cost?)

I have never gotten a good answer from board houses, but once you require a via in pad process (IPC 4761 Type V) you might as well do as many as you want right? Effectively 1 vs 100 vias is going to ...
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1answer
30 views

Plannar Inductor Unacounted Parasitic Capacitance

I'm trying to determine the source of approximately 300pf worth of parasitic capacitance in a planar coil project I'm working on. I'm trying to find out how my numerical predictions line up with the ...
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1answer
84 views

What cause a PCB track to break

I have assembled 1000 pcs of PCB. 6/1000pcs have track broken (bottom layer) as pointed in the attached picture. The pad with track connected to an electrolytic capacitor. There are two other ...
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3answers
14k views

How much space should be left between a PCB's edge and traces and holes

I am designing a PCB for use with an Arduino mega and I am wondering if there is a good rule for how much space I should leave between the edge of the PCB and various items like: traces (ground, 5v ...
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1answer
124 views

How to solder a ultra small chip

I need to use a PAN1780 board for a research project, but there exists no breakout board (only huge evaluation boards), so I somehow need to design my own breakout board and solder the chip on it. ...
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3answers
786 views

Solder paste pattern

I recently downloaded a component's footprint and it comes with a peculiar solder paste pattern (see picture attached - solder paste is in gray). Until now I have just defined the solder paste to be ...
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1answer
46 views

How to design Aluminum Clad PCB panel - how is the panel separated after assembly

This might sound trivial, but I only have experience with standard PCBs. I need to design LED tube PCB and is only 20mm wide, so there will be at least 10 pieces next to each other on one panel. My ...
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1answer
61 views

Text With White Background

I am designing a PCB and would like to have a white board with clear text in the middle like this: I have looked up altium text options online and I believe this is the "boarder option", ...
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3answers
65 views

board to board soldering without castellated vias, how?

I want to produce (small scale) a simple device (0.5A stepper motor controlled by atmega and a498 with a potentiometer to regulate speed). To simplify the whole process I'm using as many ready made ...
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1answer
124 views

What does “TYP” mean in a datasheet?

I am designing a PCB model of the ATmega32 using Altium Designer I have found the word "TYP" in the dimensions of the ATmega32 in the datasheet. What does this word refer to?

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