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

learn more… | top users | synonyms

5
votes
1answer
204 views

PCB trace clearance in 220V circuit

This is a pcb layout where I am converting 220V rms to a DC voltage (for microcontroller). The pcb has severe size constraints. This is one design I could come up with: Circuit explanation: ...
0
votes
1answer
50 views

How large should PCB traces be to control a solenoid?

I'm working on an electronics project that'll regulate and offboard solenoid. The leads controlling the solenoid will need to sustain fairly high levels of current. This is the solenoid I'm working ...
1
vote
1answer
49 views

Negative consequences use epoxy glue to fix lifted SMD trace/pad

What are some unforeseen side effects using glue to fix SMD pads and traces that have been lifted off from the PCB board. It was for 0406 caps, the cap is soldered on the pad but both pads are lifted ...
5
votes
2answers
96 views

Altium 15 - Cannot see traces in 3D view

I am new to PCB designing and I've finished creating the my first prototype board. I want to send it to get printed but I'm worried that I haven't done my traces correctly because they do not show up ...
2
votes
1answer
83 views

Plane Resistance with Vias

I have a long and wide power trace (0.3" x 3") that is duplicated on several layers of a PCB. For some thermal purposes, there are many thermal vias punched into the trace (See Figure below). I ...
2
votes
1answer
51 views

Parallel bus trace width and spacing

I have been working on designing a PCB for a Z80 computer that I plan to sell a few times for interested people. The Z80 will work at a maximum of 8 MHz and has parallel lines going to a system ...
3
votes
1answer
128 views

Does my PCB Require 50 Ohm Impedance trace even if i am using external antenna?

I am using the Quectel M95 GPRS Modem in my PCB, and the hardware reference guide says "The Pin 39 is the RF antenna pad. The RF interface has an impedance of 50Ω. " I am using a u.efl connector and ...
3
votes
2answers
159 views

Extra spacing between some traces and the ground plane

I have seen several designs where there is extra spacing between some traces and the ground plane. For example, see the traces between the points A and B or C and D in the following picture (this is a ...
3
votes
1answer
143 views

How to route a trace on PCB with 50 Ohm impedance?

I used some online calculator to calculate parameters of trace so it has 50 Ohm impedance. I use FR-4, so H=1.5mm, T=0.035mm and Er = 4.5. 2-side PCB, one side with signals, the other with GND. I set ...
1
vote
1answer
73 views

Crystal grounds and minimal trace distance to leads

Some questions have already been asked about crystals but there's a few competing designs and I have a few "obsessive" type questions on layout. Here's a almost completed layout with a PIC16F ...
1
vote
3answers
84 views

Antenna feed line calculator

I'm working on designing a board with the RFM22B-S2 SMD Wireless Transceiver - 915MHz. The board module requires a 50 ohm feed line to the antenna. I've been looking at trace impedance calculators and ...
0
votes
1answer
62 views

What kind of tracks is this?

I'm trying to know What kind of tracks is this?(What do you call this kind of tracks?) I mean those soldered tracks. I guess this kind of trick could help to increase the thickness of lines and ...
7
votes
3answers
894 views

Does this layout ever make sense to do?

Let's say I've got an power output and I want to power a chips Vin's with it. But, let's say it's a couple of different digital Vcc's on the chip that I want to power, like a rail for an LO, a rail ...
3
votes
2answers
67 views

Which traces should I fill / pour?

What are the general rules of filling / pouring traces? What traces should I pour? I assume ground is poured most often. Should I pour other traces? Supply/Signal or something else perhaps? What are ...
2
votes
2answers
275 views

Best way to fix burnt PCB trace?

So I accidentally burnt a PCB trace and I'm trying to fix it with a wire + some solder. The PCB trace clearly connects two metal pins. My question is, would it be better to completely bypass the ...
0
votes
1answer
137 views

Easy PCB trace width calculation

I've tried this question and this and several other possible duplicates of this question, but I still can't wrap my head around this. I'm using OSHPark for PCB production. They support a minimum of ...
4
votes
2answers
142 views

What's the point of this thick trace in my PCB?

I'm looking at a trace that goes from Pad 2 of a component to pin 22 of the QFN. What's the point of the thick trace at the beginning if it ends up being as small the pin where it is run?
3
votes
1answer
116 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
85 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 ...
13
votes
2answers
647 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
231 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
876 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
104 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
105 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 ...
15
votes
3answers
2k 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
1k 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
166 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
118 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
118 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
206 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
304 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
1k 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
621 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
192 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
125 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
111 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
643 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
109 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
117 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
193 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 ...
3
votes
1answer
1k 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
634 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
185 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
882 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 ...
1
vote
3answers
129 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
87 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, ...
11
votes
3answers
891 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
2k 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
113 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
876 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 ...