Lanes of copper on a printed circuit board, for carrying current or signals between pads

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3
votes
1answer
57 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 ...
0
votes
1answer
46 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 ...
12
votes
2answers
496 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
1answer
44 views

Trace Dimensions limitation for JTAG signals

I have a JTAG bus that I need to go over PCB (or could make cable) for about 12 inches. I am trying to figure out the signal integrity specs for the JTAG bus ... what trace width vs. trace length I ...
11
votes
2answers
366 views

what is the current limit through a trace?

Similar questions and topics have been asked before such as Standard PCB trace widths? Formula for voltage drop vs PCB trace width, temperature, current, and trace length I've used PCB Toolkit in ...
0
votes
1answer
82 views

Is this board trace repairable? [closed]

The attached picture shows the main board of my Canon S110 camera. The camera was subjected to a shock with the USB cable connected. This resulted in the connector breaking loose from the board with ...
2
votes
1answer
64 views

Trace width specification in PCB land pattern detail

I came across this figure in the datasheet for an accelerometer. It gives a very specific trace width (0.15mm) to escape from the pad, as well as a minimum length (0.5mm) at that width. So far, the ...
14
votes
3answers
671 views

Why do they make traces to LTZ1000 in spiral shape?

I was browsing Google images of LTZ1000 voltage reference IC. I saw that in some of the PCBs, the traces that go to LTZ1000 are in spiral shape and cut out gaps are left between them. What is the ...
5
votes
3answers
721 views

Meandering traces necessary for 24-Bit parallel RGB LCD interface?

I am working on a project that interfaces an Atmel SAMA5D3 MCU with a LCD TFT display. The interface between both is 24-Bit parallel RGB with HSYNC and VSYNC signals. The resolution of the display is ...
1
vote
4answers
102 views

PCB alterations post-production. Or, how do I not stab myself while scraping off the copper?

I made a PCB that I am happy with (it works!). This is for a power circuit, and I have realized (way too late) that I want a switch on the board as well. I bought a switch from a hardware store that ...
0
votes
1answer
50 views

Question about Audio signal trace layout (TLV320AIC3204)

I am using the TLV320AIC3204 in an audio project. The part is a stereo audio codec from TI. I'm curious about how the traces are to be laid out. With other chips such as the AD1939, you need to ...
6
votes
1answer
110 views

What design limitations does a higher-than-average resistance trace impose?

There's a Kickstarter running right now for a machine that prints circuit boards. Rather than a traditional etching process, they use conductive (silver-based) ink to print traces and pads. It has a ...
5
votes
1answer
164 views

Things to be aware of when using voronoi shaped traces

I was thinking of giving voronoi shaped traces (e.g. http://publications.csail.mit.edu/abstracts/abstracts05/rus/rus.html for those who need an example, or just google image search it) a try. In ...
1
vote
1answer
144 views

What is the purpose of curved PCB traces? [duplicate]

I have seen traces like this enough times to begin wondering if there is a purpose and benefit. The only technical explanation I can come up with is that perhaps these curved traces increase the ...
0
votes
2answers
391 views

How to measure trace impedance?

I have seen that trace impedances in PCB's are maintained 50 ohm & so on. How to measure this impedance using a simple multimeter?
5
votes
3answers
416 views

What is the name of a footprint that is designed to let you cut the trace between two nets?

I am designing a board where I want to have the ability to separate the connection between two power net's by cutting a trace. Originally headers were meant to be used but due to size constrains I ...
2
votes
2answers
167 views

Designing PCB for fast data

I'm trying to connect multiple components (same components) to an FPGA output. The FPGA runs at 30Mhz and transmitting both a clock and data on lines connected to these similar components. Each ...
3
votes
2answers
111 views

Will forced air on PCB improve current capacity of trace?

If a trace can carry 3A for a temperature rise of 20°C, will adding forced air over the board increase current capability (by any factor)? Is the current limit defined by the heat or is it the ...
0
votes
1answer
102 views

Why are these Vias of Different Shapes

While looking at how other circuits bring AC mains into their circuits, I came across this design where there are 3 differently shaped vias (from top to bottom): Figure of ...
7
votes
3answers
472 views

How to connect large traces to pads in PCB?

I am designing a PCB, and 10 A-15 A current is flowing in a trace. I think a 300 thou track should be used for 1 oz Cu-thickness. I see that it is impossible to connect two pads ...
-1
votes
2answers
102 views

Pseudo RF in embedded boards

I noticed that wifi-capable embedded boards integrate the RF into the board design instead of having a separate, add-on wifi card. They have meshes that are etched into the board and the rest of the ...
0
votes
1answer
90 views

What is the impact high current through of narrow trace?

A 20mil external trace with a copper weight of 0.5oz can carry ~2.5A with a temp rise of 30C (according to Saturn PCB Toolkit) If my signal was a digital signal < 10khz with rise/fall time in the ...
0
votes
4answers
144 views

High AC voltage affects the pcb

I had a PCB board printed that has some relays that are connected to 220 VAC circuit. Now unfortunately some traces passes near the relays and are affected by this high voltage causing the circuit to ...
0
votes
0answers
68 views

Maximum length for the trace

I'm struggling over this question: In a microprocessor currents are sent through various materials for communications and power. Assuming you want to deliver a 5𝑉 ± 0.5𝑉 signal through the trace to ...
2
votes
1answer
557 views

Formula for voltage drop vs PCB trace width, temperature, current, and trace length

I need to find out the voltage drop in the PCB traces with respect to the possible factors like: copper thickness, trace length, trace width, temperature, etc. I found some calculators available at: ...
2
votes
1answer
368 views

PCB Crosstalk calculators… Center line distance or trace separation

I am still a beginner in this field, and recently I've learned about Crosstalk and Crosstalk calculators. I've tried the one on EEweb, Saturn, Ultracad and some others. Some of these calculators ask ...
0
votes
1answer
95 views

In Altium Designer, how can you set the autotracer to route all traces with as equal lengths as possible?

Note that this board does not require a power or ground plane, since it's just used to bridge two boards. I want the traces to be as equal in length as possible in order to minimize any difference in ...
4
votes
3answers
612 views

Can I prevent copper traces from delaminating due to soldering heat?

I'm making a PCB that has a 100pin QFP pacakge microcontroller. After gaining experience with the UV photoresist process and reliably making the small, 0.5mm traces, I have a new problem: the copper ...
0
votes
2answers
81 views

Why polygon pour size and trace width don't influence each other in altium

Im using some thin traces in certain areas of the board that I want to have beefed up with a polygon pour. However, when I run the rule check it just ignores that the width of the traces is now ...
1
vote
3answers
78 views

Good method to remove tenting on vias after assembly for debugging?

This is a question about modifying an assembled board to make it easier to debug. In a perfect world, I would have left the bottoms of these vias un-tented. Whoops. I have two BGA parts on a PCB, ...
10
votes
3answers
832 views

Can I solder a wire between two leads on a PCB to make up for a trace that isn't wide enough?

I have a PCB that has 2 traces on one corner who's width only supports a ~10a load. I need support for a 20a load. Actually, it really only needs to support a 15amp load but I'm trying to build in ...
2
votes
2answers
984 views

How does Altium Designer's “impedance constraint” feature work?

Altium has a design rules option for setting a track width constraint according to line's impedance (e.g.; 50\$\Omega\$). How do I use it? Please give me instructions or a link to an online tutorial. ...
0
votes
1answer
90 views

Trace aligment in a double sided PCB

Are there any layout requirements/special considerations when routing traces on top and bottom layers of a double sided PCB, e.g. angle between traces, can traces pass beneath an IC, etc? I know that ...
2
votes
2answers
428 views

What types of signals should be considered to have a 50 Ω trace impedance?

Generally speaking, what time of signals should be designed to have a 50 Ω trace impedance ? Some datasheets I've read have specifically mentioned 50 Ω but others have not. Is it good practice to ...
3
votes
1answer
141 views

What does “50 ohm system” mean?

I'm looking to use the following switch to switch an SPI bus ( CLK <= 2Mhz) between two different devices. I'm reading the datasheet to see if the the frequency of the signals are going to be ok, ...
3
votes
3answers
3k views

What is a suitable temperature rise for PCB traces?

I'm designing a PCB for a 10A relay and am trying to determine what the trace width should be. According to this trace width calculator, the biggest factors in the width are copper thickness, ...
1
vote
3answers
172 views

How can I “print” traces on the back of a ceramic package?

I have a project I'm working on that is so tightly packed that I'm totally out of room. I could save the whole thing by slapping a bunch of surface mount LEDs (30 of them) on the back of a ...
7
votes
1answer
963 views

Trace width and clearance calculations

What is the math behind traces and clearance calculations? I am designing a PCB, which will carry 12V and 6A, what should be trace width and trace clearance? Similarly, what should it be for 12V 3A, ...
10
votes
2answers
1k views

Is there any disadvantage to changing trace width in the middle of a trace?

Say I have a trace running across a board. It's 50 mils the majority of its length, but in one short place it narrows to 25 mils to make it through a tight area. As best I can tell, this will be ...
1
vote
1answer
159 views

Identify and replace a resistor [closed]

My APC UPS stopped working. I have had it for many years and it was serviced once by APC while in warranty and never opened again. Now since it is not in warranty anymore I opened it and saw two ...
1
vote
1answer
114 views

PCB etching from transparency

I wonder if someone could help me. A few days ago, my brother gave me all of his electronics, seeing that he doesn't need it anymore. I'm keen to learn electronics in depth and have basic knowledge ...
1
vote
2answers
409 views

Parasitic inductance of PCB tracks

For a PCB design, the longer the track length the greater the parasitic inductance right? But why would this be a concern if I'm working at low frequencies (e.g 50-60Hz) because it'll behave similar ...
3
votes
1answer
556 views

Are traces exiting a pad at an angle bad?

I have been told in the past that you should always have traces leaving a pad on a straight line. The reason I was given was that it could create an acid trap. From what I have read this is not ...
28
votes
4answers
10k views

How can PCB trace have 50 ohm impedance regardless of length and signal frequency?

Hmm, this seems to be just another question on line impedances. I understand that when we say "transmission line" effects we talk about things like cross talk, reflections and ringing (I guess that ...
3
votes
1answer
873 views

Are there any rules of thumb when computing pulse current ratings for PCB traces?

Say I have a surface PCB trace, 4 oz, 50 mils. That trace should be able to carry around 15 amps continuous, according a calculator I'm using. (Obviously your trace ampacity estimates may vary with ...
8
votes
5answers
800 views

Best way to test a high current pcb design 70A @ 12V

I designed a circuit (MOSFET HBRIDGE) that Should Be able to handle 70A @ 14V. Now that the board is sent out I am on to thinking about how to properly test it. Right now the most logical way I have ...
5
votes
2answers
385 views

What should be considered when sizing trace widths for digital logic signals?

For traces that carry a static DC current, it's pretty easy to calculate the minimum trace width based on the required ampacity of the trace. However, I'm not sure what should be considered when ...
3
votes
1answer
507 views

Power Plane and Decoupling Capacitors Routing

Forgive me for my simplicity. I'm just a hobbyist and not an engineer by trade. I am trying to make my first 4 layer PCB in Eagle and I have a question I cannot find the answer to regarding power ...
1
vote
3answers
250 views

11A trace width

Using this PCB Trace Width Calculator the external tace width for 11A (default settings) is suggested as 8.21mm. Is this acceptable? I was expecting something bigger, and just wanted to check that ...
2
votes
2answers
915 views

In Altium how do you increase the trace width from a Pour to GND Vias and Pads?

In my PCB layout I have a ground power connector and several pads where I would like thick traces to connect to the ground plane. When I use the polygon pour feature, it will connect these with 4 ...