Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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34 views

Where can I buy an economic machine for through hole plating? [closed]

I'm developing an double side pcb project and I need of a economic through hole plating machine. Where can I buy an economic machine for through hole plating ?
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0answers
71 views

Board routing review

I need some criticism about this board. I ordered a test batch today and I would like to learn how to improve it. My project is here: https://easyeda.com/be.mihai22/project-hawk I used two layers ...
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1answer
50 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.
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1answer
97 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 ...
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1answer
36 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 ...
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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 ...
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1answer
71 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? ...
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0answers
40 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 ...
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2answers
61 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 ...
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1answer
41 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/...
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2answers
66 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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10answers
10k 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 ...
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1answer
81 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 ...
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5answers
7k 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 ...
4
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2answers
656 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 ...
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1answer
79 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?
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0answers
20 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 ...
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2answers
203 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 ...
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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 ...
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3answers
163 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 ...
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3answers
47 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 ...
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1answer
137 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 ...
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2answers
159 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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1answer
139 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 ...
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5answers
246 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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2answers
73 views

Efficient assembly/fabrication of PCBs differing only in solder jumper configurations

I have a PCB design with solder jumpers which need to be bridged to select specific functionality - say A and B. Half of the PCBs are going to have A and the other half B bridged. Is there an ...
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2answers
125 views

8-layer Stackup: 3 cores vs 4 cores

For a new project I am looking to use 8 layers and I am currently figuring out the layer stack I want to use. As for usage, I will most likely go with: Top GND Plane 1 Signal 1 Power plane 1 Power ...
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2answers
122 views

Eagle Drill vs. Diameter Parameters when making Through Hole Parts

I am working on making footprints in Eagle for a through-hole connector I want to use. I am running into some issues as I try to determine the appropriate diameter and drill size I need for the ...
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1answer
172 views

How to evaluate the reliability of a PCB-printing service?

I had a talk with a friend the other day who told me that he had many issues with PCB-manufacturers in China (copying his product, long delivery times, bad quality) and that he had to sell his company ...
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1answer
2k views

Intriguing obsolete(?) PCB manufacture techniques in this old MSX

Browsing Wikipedia (as one does), I have stumbled upon this picture of a circuit board¹: Now, when you look at it, there are several things that stand out as being interesting and different to today'...
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1answer
31 views

Clearance between hole and power plane after removing unused via pads

After removing unconnected via pads and repuring copper fill, the clearance between the via hole and the fill will be defined by the rules, but the pours will be closer to the hole. Does this bring ...
0
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1answer
88 views

PCB Panelization Impact

What is the impact on a PCB design if it is panelized? I received a message from a PCB manufacturer: In your order, the quantity of boards is large and the boards are quite small. Can we panelize ...
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4answers
138 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
3k views

Why do some PCBs have exposed plated perimeters?

I've seen a number of PCBs, largely high speed and RF boards, that have exposed copper, either at the perimeter of the entire board, or in various sections, often with stitching vias. I've never ...
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2answers
1k views

What is an acid trap

I've heard about acid traps and that they are something from the days of yore. But what are they and how are they created?
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1answer
58 views

PCB Thickness Variability

How much variability is there in the thickness of a standard PCB? Let's say I order a 1.6mm FR-4 board. Will the actual thickness range 1.5mm-1.7mm? 1.4mm-1.8mm? 1.59mm-1.61mm? What is the (...
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2answers
153 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 ...
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1answer
104 views

Surface Mount Adapter PCB With Castellated Holes

I have some prototype boards that I would like to modify. The modification includes removing a section of circuit and replacing it with another circuit. My theory on how to do this is to make an ...
22
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4answers
6k views

Different PCB color (is it a different material?)

I have acquired this PCB. The right side of the PCB handles high voltage AC power (250 V maximum,) while the left side handles low DC voltages (24 V maximum.) They are separated, not ...
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0answers
202 views

How to calculate stray capacitance on PCB

I use a 0.4mm spacing between PCB traces (including 0.4mm space between crystal pads and ground) and I believe that's causing stray capacitance. My circuit board is typical (1 ounce copper on FR4 ...
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1answer
54 views

Whats the purpose of the box in Proteus? [closed]

Like the title suggest, in Proteus 8, there is a box. why is it there? because we can simulate outside the box and it will work, so whats the purpose of the box ?
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1answer
99 views

For a HASL Finish PCB, Can Gold Plating be done

We have a HASL finished PCB but the pads needed gold plating for wirebonding. Can gold plating be done on top layer of PCB over this? Will there be any reliability issues?
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1answer
97 views

How to safely limit current for DC12v 30a?

I am plating my vias with electrolysis, and I need to safely limit the current so it doesn't go over 30 amps. The power supply I'm going to order is, you guessed it, 12V 30A. I've calculated the ...
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3answers
274 views

Which gerber files I need to send to my PCB manufacturer?

My PCB has two layers. I'm using altium and, after to generate the gerber files, I will to generate the drill files and send to a PCB's manufacturer. But, about mechanical gerber files extensions, ...
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2answers
199 views

PCB etching gone bad

I'm etching a double sided circuit board for my project in electrical engineering but somehow the PCB gets these weird marks and turns out bad. I tried different things like washing the PCB before ...
6
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1answer
154 views

High Frequency Characteristics of Solder-Filled Vias

If a via gets plugged with solder, does this destroy its ability to pass high frequency (RF noise) currents? Since there is no longer a surface along which the high frequency currents can travel due ...
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2answers
62 views

What does Minimum Slot Aperature mean?

Exploring some fab houses and I came across this statement from https://www.viapart.com/PCB/Explain "Minimum slot aperture Mechanical drill 0.6mm The tolerance of groove aperture is±0.1mm" Does ...
3
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1answer
115 views

Having different voltage potentials as power planes on the same inner layer of a PCB

I am working on a 6 layer job which placement of the given components in the rather limited area that I have to work with...is driving me a bit crazy. I have no option but to have 2 different voltage ...
6
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1answer
262 views

Connecting top and bottom SMD component pads using via

I am working on a 2 layer board and the PCB will be a double sided job. Some components on the top layer will have exact mirrors on the bottom right under them. My question is, for SMD components, can ...
-4
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1answer
132 views

PCB Layout validation [closed]

I'd like to know if the pcb layout is ok for the 2 op amps that i use.I'm interested in grounding and if the op-amps have proper layout(not too long loops or poor ground planes). source files The ...