Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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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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31 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
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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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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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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
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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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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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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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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31 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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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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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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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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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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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
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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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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78 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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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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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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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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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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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
160 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
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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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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1answer
45 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
63 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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3answers
285 views

About the mechanical layer in altium PCB

I have downloaded the footprint for ATmega32 SMD as in the figure my question what is the need for the mechanical layer with purple and green colors in this foot print (and after fabricating the ...
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3answers
66 views

PCB copper fill

Hi I am new to PCB design and Im still learning. I am wondering what is the reason behind copper fills? I searched online but I could not find an good explanation of the reason of using the copper ...
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1answer
72 views

Choosing a non specific heatsink

I am designing a PCB board, and it has lots of components on it. It has like 8 MOSFETs, diodes, fuses, current sensors, a STM32 and other components, and with an exception to a few (like mosfets and ...
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1answer
55 views

How are different circuit form factors (SODIMM, PCIe) designed and manufactured? [closed]

Using recent technologies, System on Chips (SoC) and other type of single board computers are manufactured on compact small boards. A common form-factor SoCs is a DIMM based or even PCIe form factors....
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3answers
125 views

pcb trace to act as a potentiometer?

I'm looking to track the position of a pin on a shape display. I wanted to see if it's possible to make a PCB trace that could be put on the side of the pin and act as a potentiometer to gauge it's ...
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1answer
137 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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1answer
92 views

Least resistance in PCB trace

If you have long PCB traces and want to minimize the resistance, is it feasible/viable to use through hole vias to be able to utilize copper on both sides of the board? If width of the trace is ...
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4answers
119 views

PCB gold plating

Is it really nessesary for PCB with BGA cases to be gold plated? Also I've heard that edge connectors (like PCIexpress etc.) must also be gold plated? Why is that? What are the consequences of not ...
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1answer
173 views

What is the polygon pour and power plane for in a PCB?

I am newly in PCB design. Can any one explain me what polygon pours and power planes are used for in Altium PCB, or give me a link that explains it?
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1answer
49 views

Choosing industrial grade components after a consumer grade proof of concept

I assembled a basic prototype with an ATSAMD21G18 based microcontroller and what I believe are consumer grade sensors (LSM6DSOX, LIS3MDL) to test out a proof of concept for product that would need to ...
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38 views

UV solder mask and dry film solder mask

I am interested in masking my PCBs and I have a few questions about the process: Using a dry film solder mask seems more straight-forward, but it is more expensive. If I use UV solder mask in a ...
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2answers
77 views

Use of tin plating

I have been researching about PCB development, and I came across the tin plating process. Consider the following scenario: I have created a PCB, covered it with solder mask, and I am now ready to ...
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1answer
223 views

Altium Designer : How to make a custom Top paste for D2PAK pad

I know my way around altium designer but i am not finding a good way to make openings in the solder paste layer for the tab pad of D2pak . This is what i want : Altium only allows me to make the ...
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2answers
113 views

What is this called, PCB bevelled fingers?

I found this non-plated fingers PCB connector, with blackish color, in a Logitech MK240 wireless keyboard. This fingers connect between the PCB and plastic sheets wiring (for the keys). It is a bit ...
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40 views

Caps under DIMM sockets?

I have DIMM sockets too close together to put caps just outside their edges. And places they can fit are technically too far away. Can you safely put 0402 caps in the places under the socket, where ...

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