PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.

learn more… | top users | synonyms (2)

3
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1answer
52 views

Splitting a big Power Trace to several smaller

I would ask if i can layout a big trace and split it into many smaller ones (see attachement) I need to run a trace capable of handling ~5A. But the trace would be too thick to fit between the pins ...
2
votes
3answers
61 views

Reduce trace width increase thickness with solder

Im designing a led driver for a friend of mine. The total consumption would be 0.5A (per Meter of led Strip) * 9 Meter = 4.5A, or around 5A. The strips are connected via screw terminals. The problem ...
3
votes
1answer
119 views

PCB Stackup - Current return path

It is a well known fact that high speed signal would have return current path on the plane right beneath it's PCB trace. Suppose we have 4 layer stackup, SIG-GND-PWR-SIG with dielectrics ...
0
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0answers
28 views

PCB custom - tm4c12333h6pm

Previously, I tried to make a cusotm PCB with a tm4c123gh6pgei (tm4c123gh6pgei - Custom PCB) After investigation of that PCB, I was able to observe that the JTAG communication occured but because of ...
0
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0answers
41 views

Can I use General Purpose Printed Circuit Board for any voltage or current rating?

The thickness and width of the copper pad (1 ounce/ 2 ounce) depends on the current that will pass through it. Can the General Purpose PCB withstand high currents (up to 15/20A)? If not, is there ...
1
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1answer
27 views

Importing Drawings ( DXF,DWG ) in Altium

I'm having trouble importing DXF / DWG into Altium. I followed File-->Import-->selected my dxf,dwg-->config-->Information show Done!!-->and nothing shows up on my mechanical layer. I'm using Altium ...
1
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2answers
50 views

How to design a metal plate for PCB

I am designing a Esp8266 based WiFi module, and I' not sure if I need one of those metal plates. They are suppose to protect a sensitive area from EMI/RFI, right? Also, how can I design one with ...
0
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1answer
70 views

What constitutes a Via-in-Pad?

Would any of the via's in the picture be considered a via-in-pad? or is it only if it's dead center of the pad?
3
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1answer
45 views

What are “slash sheets”, and how do they relate to PCB substrates?

I am trying to specify the stackup for a PCB. Previously I have used whatever the board house considered to be their "standard" stackup. This time I am looking at using FR-408 (pdf) because of its ...
1
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0answers
76 views

Customized torch/flash light using a perfboard with an attiny

I am currently working on customizing the flashing frequency of a torch light (customized intervals between on&off). To program the individual frequency I have made use of an attiny 85 ...
18
votes
4answers
971 views

Why do characteristic impedances matter only when traces are longer than half a wavelength?

Why are characteristic impedances of traces not considered when the traces are shorter than half a wavelength? I've had the same issue with light diffraction, which happens when pinholes are smaller ...
-1
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0answers
41 views

Developing / Documenting schematic / PCB design process. Need a little help [on hold]

So I have recently been tasked with documenting our schematic and PCB procedures as well as the creating a best practices document on how to do things and what they should look like. im having trouble ...
0
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1answer
45 views

Trace width calculator for any material

I'd really like to make a calculator which outputs the width of a conductor given the following inputs: resistivity, trace thickness, trace length, applied power (or current and voltage), not to ...
0
votes
1answer
37 views

Design PCB with copper polygon (Altium)

I'm sort of new to Altium, so any kind of detailed help would be very welcome... I need to create a PCB in altium that has copper all around with small plastic channels surrounding the tracks. Is it ...
12
votes
2answers
494 views

Is it proper to use an internal layer as a heat bed if I want to warm my multilayer PCB?

I need to design a circuit to warm my PCB. There are many ways to build up such circuit. But I learned from a post "Warming PCB in a low temperature environment" that maybe I can use traces as heater. ...
1
vote
3answers
65 views

PCB Holes Too Small to Fit Component

Based on the VSK-S25 datasheet which states the holes to have a diameter of 1.5 mm, I used the following values in EAGLE When the PCB is made, it turns out that the pins of VSK-S25 are too ...
2
votes
2answers
418 views

How does this button work without any circuit closing device?

This may be a stupid question, but I have searched online for a little bit and can't seem to find my answer. I am working on a circuit board that uses buttons that i've never seen before. These ...
4
votes
3answers
122 views

Is it possible to create a double layer PCB by gluing together two single layer PCBs?

I'm really in a hurry with a university project. I need to finish the first prototype of an electronics board by the end of the week. It's a through hole board, no SMD. Having just single sided ...
1
vote
1answer
36 views

PCB stackup plane distance

What are the main reasons why one would choose one of the following options: sig (1") space gnd (4") space pwr (1") space sig comparing with sig (1") space gnd (1") space sig/pwr (1") space sig ...
0
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1answer
61 views

analog error pcb

I am building a scale with a load cell and a INA122 equivalent circuit. When I build it in a breadboard I get very good readings but when I place it on the PCB I only get a -3.8V at the output of the ...
0
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0answers
37 views

Altium: Connecting routes through different layers

I know how to route and create vias to connect the track from one layer to the next (i.e. layer A to B then to C). But is it possible to connect tracks from one layer to a specified layer directly ...
0
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2answers
33 views

Pad and soldermask dimensions in PCB design

I found that usually on BGA package and on a lot of QFN datasheets are provided IC and PAD-IC dimensions and not advised PCB-PAD dimensions and soldermask dimensions. Can someone tell me a good rule ...
0
votes
1answer
34 views

Altium: White 2D outlines [duplicate]

I started my component orientation when I suddenly see those white outlines around my components. And as I zoom in, they increase in number. Even when I tried to move my components elsewhere, they ...
14
votes
3answers
2k views

Why are vias bad?

I am designing a PCB with EAGLE and saw that it was trying to limit the amount of vias through the PCB. Why do you want less vias? Why are they bad? Do they bring extra manufacturing cost or is it ...
2
votes
1answer
34 views

Eagle CAD: method of re-linking schematic and board?

I've accidentally lost the sync between my schematic and board, with Eagle CAD giving me the following error: Board and schematic are not consistent! No forward-/backannotation will be ...
1
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1answer
43 views

Footprint election

I have to do a PCB and I have seen that the datasheet of some discrete component like microcontrollers indicate what footprint to use, but when I want to choose the footprint of a capacitor or ...
0
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1answer
54 views

Altium: How can I edit a component from a library

I downloaded a library from the internet and I want to create a new PCB component using the ones in the downloaded library with little editing/changes (such as the footprint). Is that possible? How?
0
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3answers
85 views

PCB design few questions

Quick couple of questions, I am designing my first PCB and want to have a few boards prototyped with OSH Park. For a board I will be manually soldering components to, will I need to include a tCream ...
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0answers
39 views

Atlium: Errors in PCB

I keep getting the same errors repetitively and I couldn't figure out the reason. As I was placing the components on the correct position (i.e. resistor), suddenly the component changed pattern from ...
0
votes
1answer
46 views

What is the correct / better way to align two connectors across boards?

I have a 96 pole connector and a 32 pole connector on one board which plugs into the mating connectors on another board. What is the correct way (and hopefully easier way) of ensuring that they are ...
0
votes
3answers
60 views

Power supply PCB

I made a PCB board (my first one) recently and I ran into some issues with it while troubleshooting. The PCB board is connected to an Arduino and draws 5V and the 3.3V supply from it. Also, the board ...
0
votes
1answer
22 views

Altium Design Rule - Selecting Pads Whose Parent Component is not type “No BOM”

I can create a query to select only pads and a query to select only components who are not type "No BOM", but I can't seem to find a way to put these together to create a design rule that only selects ...
1
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3answers
56 views

Is there a standard for maximum torque that should be used to fasten PCBs to an enclosure?

I am looking for a standard or guideline which describes how much torque should be used to fasten a PCB to an enclosure using different types of fasteners. For example, we use M3 hex nuts in a ...
0
votes
4answers
166 views

Troubleshooting PCB of an ATX power supply?

Im new to PCBs, know the basics of electronics and testing of individual components. I have a PCB (of an ATX supply) that is not working when I power it, so I thought of testing each components like ...
0
votes
1answer
55 views

Eagle will not finish auto routing?

Using Eagle for mac, I am trying to autoroute the board. I have set the trace width to 8. He start the process and it takes him about 2 minutes, than he stops at some point and show the next ...
0
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0answers
30 views

No trace in the pcb gerber from Eagle?

I use Eagle to create gerber files. Here is the gerber file job : ...
-5
votes
1answer
76 views

Is this PCB burned, and is it correct? [duplicate]

Okay, so I am a newbie with technology and was wondering if, when soldering, I accidentally burned this PCB and so far, does it match the schematic for the thing I am making? Also, if it is burned, ...
0
votes
2answers
110 views

is it a photodiode or a phototransistor?

I have been working on a circuit which involves a photosensitive element soldered on a PCB. I am confused whether it is a photodiode or a phototransistor. Is there any means by which I can figure out ...
0
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2answers
68 views

PCB manufactoring-There shouldn't be bottom silkscreen selected?

I use Eagle to create gerber files . When i am trying to check my zip gerber, in 4pcb.com i get this message : ...
0
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1answer
93 views

What is this SMD component

Just out of curiosity I am trying to find out. What type of component is the green flat one in the picture?
2
votes
1answer
58 views

Crystal Footprint Placement

Pretty simple question, please point me in the right direction if this has already been asked. I am designing a board around freescale's IMX23 microprocessor which runs from an external crystal at ...
12
votes
3answers
874 views

What kind of material of PCB should I choose to work at -40 degree centigrade?

I need to design a PCB circuit to work at (or even below) -40 degree centigrade. Normally, I use FR-4 PCB board at room temperature. However, I have learned from the question "What is the minimum ...
0
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0answers
48 views

PCB repair question (ripped cap pad)

I ripped the thru-hole pad on back of the PCB on the positive terminal of the C18 cap shown in this diagram, and there are no visible traces coming from it. Rather than try and repair the pad (it's ...
0
votes
1answer
60 views

Why PCB thickness in Microns

I have created Gerber files for one of my application circuit. While giving it for development, manufacturer is asking for thickness in microns. My question is why thickness is given expressed in ...
0
votes
1answer
33 views

Feasibility- Flex Capacitive Touchpad

I'm a student(don't know much on Eagle) working on a project where I need a way of multi-touch finger tracking on flexible material. Will flex pcbs work?
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0answers
32 views

How to connect USB mini-b pins on a PCB?

I want to design a PCB which contains either PIC24FJ128GA010 or PIC24fj256gb110 (still haven't decided). Now the second contains a USB 2.0 on the go and the first one doesn't. I want to power the ...
0
votes
1answer
90 views

Transmission line: Why do longer traces cause signal reflections?

As the question says, I want to know why do longer traces/longer lengths of non-terminated signals of the PCB cause reflections and not the short length ones? I am ignoring the negligible amount of ...
0
votes
3answers
56 views

PCB Integrated Chip Question

Hi I am building a PCB using eagle and its the first time I am using an IC. Two questions arose. Do I need to connect the IC chip's ground, because eagle did not do it? Do I need to make sure all ...
1
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1answer
62 views

I'm looking for a specific replacement PCB module connector [closed]

I wonder of anyone here may be able to help. I've been looking for some time now for a replacement for an old (c. 1980s or early 1990s) PCB module connector. I'm looking for anything similar in order ...
0
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0answers
23 views

Eagle cad dimension measurement showing on tob and bottom layer when creating Gerber files

I have an Eagle design as shown in the 1st image attached. The dimension measurements are on "dimensions" layer 20. When I create Gerber files then look at it in a viewer, I get the measurement ...