Questions tagged [pcb-fabrication]

About the manufacturing of PCBs (Printed Circuit Boards).

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52 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
63 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
47 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
54 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
68 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
49 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
98 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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0answers
24 views

FlatCAM Black Plotting Area Problem

I am trying to learn to use this software that converts gerber files into gcode called FlatCAM. 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
82 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
96 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
45 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
44 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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29 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
73 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
36 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
99 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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0answers
35 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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0answers
34 views

Gerber interpretation of “clear” on silkscreen

I've had some PCBs back from my manufacturer which I haven't used before, and was surprised with some silkscreen printing which I consider to be an error. The bottom should have had no silkscreen ...
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1answer
45 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. ...
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1answer
119 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 ...
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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 ...
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76 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 ...
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1answer
43 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 ...
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1answer
76 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 ...
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1answer
29 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 ...
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1answer
36 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 ...
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2answers
153 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. ...
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0answers
35 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 ...
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2answers
107 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 ...
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0answers
38 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 ...
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1answer
98 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 ...
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1answer
90 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
120 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
43 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
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? ...
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0answers
54 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
82 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
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/...
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2answers
82 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
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 ...
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1answer
84 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
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 ...
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2answers
685 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
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?
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0answers
28 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
276 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
262 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
52 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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