Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [pcb-design]

About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

0
votes
0answers
32 views

Routing the main power supply across a PCB and choosing vias for it

I have a board that uses several different switching converters with 33uH ferrite beads that take up a fair amount of space. I'd originally intended to keep them all at the top of the board (not top ...
0
votes
1answer
17 views

Room lines stills on my pcb and the top layers tracks are not displayed in 3D view, Altium

The fact is that I have routed. I would like to know how to proceed when this kind of thing happens when using altium. The routed tracks can be seen perfectly in 2D view. But when click 3D view I can ...
-1
votes
0answers
70 views

NanoPi Neo4 Power supply scheme help

Title might seem a little misleading, but honestly quite hard to word a title for my particular problem. The board design I'm working with combines the NanoPi NEO4 minus specific components which I ...
0
votes
1answer
33 views

DC Motor bridge driver L298N. Why separate the tracks after R sense resistors from GND plane?

The L298N datasheet says: The sense resistor, not of a wire wound type, must be grounded near the negative pole of Vs that must be near the GND pin of the I.C. why not in common GND plane? If I ...
0
votes
1answer
50 views

When is it important to handle reflections in pcb design?

I am watching some videos explaining how reflection can affect a signal and how you should treat these signals as transmission lines to remove reflection. I wanted to understand a more practical ...
0
votes
2answers
29 views

What is an example of driver and receiver chips for a PCB?

I am watching some tutorials on signal integrity and the instructor keeps referring to a driver and a receiver. I am a little confused what exactly this would be when designing a PCB is the driver ...
0
votes
2answers
49 views

Is this a suitable Voltage Regulator to replace an old circuit on my board and is my logic correct?

I have 4 of these 2n3904 transistor setups on my board: A1 -- requires 5v on these 2 connected pins to be enabled. I control this by driving r2 high at 3.3v which should allow 5v to flow through the ...
2
votes
1answer
65 views

Ground plane: is there a tool to identify choke points of a fragmented copper polygon in Eagle?

As they say a picture says a thousand words. Consider this extreme example: You have this copper polygon (a ground plane), but due to other signals routed on the same layer, the polygon comes to a ...
1
vote
3answers
124 views

PCB design for outdoor use without coating

I am making a PCB for a home project: a small weather station that I will place outdoors to collect data. There is now a question of environmental resistance. I can mill out the PCB for free on a ...
0
votes
1answer
58 views

Does a Vcc layer cause noise to a 4-layer RF PCB?

I'm designing a 4 layer GPS tracker PCB with the 2nd layer as ground and 3rd as Vcc. Is this a good practice? I know a gnd layer is good but I'm not sure how to distribute the positive of the supply ...
1
vote
1answer
62 views

Contradicting ideas about differential signal route, confining fields vs Increasing impedance

By initial sense I think we must: keep pair intra-distance as close as possible for field cancellation. Fill surround of pair with GND plane and have via near to it to confine the fields, prevent ...
0
votes
1answer
35 views

Power supply and pcb connections to ground, earth

I am planning a pcb which is powered by two switching power supplies LRS-150F-5 (230 V/AC to 5 V/DC) LRS-150F-12 (230 V/AC to 12 V/DC) . The power supplies are mounted in their own metal box and the ...
0
votes
1answer
82 views

Implementation of Decoupling capacitor [closed]

I have schematic for decoupling capacitors (3 set of 0.1uF,1nF,10pF): And I've implemented that in this way: And there is ADI reference for easy evaluation: And the ground pins of decoupling caps ...
10
votes
1answer
732 views

90° Bend: Mitered vs Curved

On RF PCBs to bend a trace 90° you have many choices but among them Curved and Mitered bend considered as a good choice from performance POV (Both shown below). For many years I thought that if you ...
3
votes
3answers
854 views

How do I know where to put stitching vias?

I'm working on a PCB that allows me to attach a TSSOP IO expander to a breadboard more easily for experimenting. I asked a question regarding the configuration of decoupling capacitors for an IC with ...
1
vote
2answers
127 views

Is this a valid configuration for decoupling capacitors on an IC with two supply pins?

I have a project that's using an IC that only comes in SMD packages. With my limited soldering experience, I think I could potentially solder a TSSOP, but I think QFN is well beyond my capabilities. ...
0
votes
1answer
64 views

Impedance matching in multi-layer circuits

In a new circuit design, I need some impedance matching for some high speed traces (i.e. Ethernet, USB, SD card...). Usually I define tracks width with this web tool https://www.eeweb.com/tools/...
0
votes
3answers
173 views

How to route Ethernet PCB ? [closed]

I am new to PCB routing. In one of my projects, I need to be able to exchange data between nano-computers (https://www.variscite.com/wp-content/uploads/2018/01/DART-6UL_DART-6UL-5G_Datasheet.pdf) ...
0
votes
0answers
49 views

Should right angles at pads be avoided in traces on a PCB?

I have been told that traces shouldn't bend at 90 degrees or less, because electrons get trapped in those angles. Does the same also hold for when traces meet at pads? Is the left pad in C2 ...
0
votes
2answers
54 views

Bus vs Signal Harness in Altium

I am designing a Schematics for one of my big project. I am using Hierarchical Design for my project. My Schematics has one processor which has 5 UART. The UART nets have names like ...
0
votes
1answer
23 views

How to reverse the pinout of connector in Eagle

I have a screw connector with multiple pins and it seems like it will be easier to do the layout if I reverse the pinout on the connector. So if I have a 3 pin screw connector I would just need to ...
0
votes
1answer
97 views

What is going on with this zig-zag trace connected to the processor?

I'm taking apart a Pogoplug_V4_A1_V3.1, and I noticed this trace in a corner of a board, connected to the Marvell 88F6192 processor: The trace itself is approx. 0.2Ω, and the resistor is approx. 0Ω. ...
0
votes
1answer
102 views

Removing the smallest supply decoupling capacitors in multilayer boards

Hello I want to make PCB for ADF5901 24GHz power amplifier, it says use 3 capacitor for each supply pin, 10pF, 1nF and 100nF. we have about 6 supply pin. Can we remove 10pf bypass from all pins, If ...
10
votes
2answers
438 views

‘One for all’ standardized land pattern v.s. specified land pattern in datasheet

I’ve designed lot of ‘simple’ PCBs for hobby and proof-of-concept purposes, but never for (mass)manufacturing. In order to do so in the future, and further expanding my design skills and knowledge, I’...
7
votes
2answers
76 views

Component designators on multi-pcb projects

I am currently working on a project that goes over multiple PCBs for the first time and realised that i don't know what the "standard" or best practice for component designators over two (or more) ...
0
votes
0answers
39 views

What connector can be used for dimmer output?

I have some poorly designed PCB board (LED dimmer), through-hole mounting. The output is in the left corner, it have 8 x 0.1" pitch pin mounting holes for connecting line-in, power, and output (H,M,L,+...
3
votes
4answers
141 views

Linear Regulator PCB placement

I'm designing a PCB with some noise-sensitive components (FPGA, RF mixer, etc.). For the power systems I've decided to chain switching regulators to LDO regulators so that I get less heat dissipation ...
4
votes
1answer
31 views

Is this possible to make a module with both castellations and LGA?

I am trying to decide on a pinout methodology for a module that will be assembled board to board on a bigger PCB. considering the pros and cons of LGA vs. castellations(cut half vias), i was thinking ...
6
votes
2answers
131 views

High Voltage Capacitor Lead Clearance

I am designing a high voltage board, 10,000 VDC. I wish to use a suitably rated capacitor such as the DHR4E4A102K2BB. When I have been studying the ...
2
votes
1answer
33 views

Micro USB Type B Receptacle Mounting Holes Near Pads

I noticed a few libraries, in their micro subtype b footprint designs, include round mounting holes very near (touching) the pads. In Eagle, these end up giving me dimension errors. I tried ...
6
votes
3answers
1k views

What are the use cases for a closed solder jumper on a PCB?

I've come across the the symbols for closed solder jumpers in design libraries, and now I came across one in a design. I get why you might include an open jumper that could be solder closed, but what ...
0
votes
1answer
76 views

How to find CPU by needed parameters?

I trying to find a low-power processing unit with lowest price for some practical research. I trying to made a simple device with 1 SATA 3.0, 1 microSD and 1 USB 3.0 interfaces. Can someone advise ...
9
votes
7answers
2k views

How can the ACS712 pin handle 20 A?

I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
-1
votes
0answers
32 views

Would the 12V relay coil induce significant back and forth current in copper traces of PCB?

will it induce currents in traces just below it or nearby it on PCB, if relay gets switched many times during operation? I am concern about the coils magnetic field change during switchings. Are ...
2
votes
3answers
150 views

Rectifying failed MCU crystal oscillator design

I am working on an SMD hobby project (2 layer board) where I use a STM32F405 MCU running at 3.3V, clocked from a 25MHz external crystal. Being impatient, I hastily designed a board and ordered it. ...
1
vote
1answer
54 views

I2C bus line over different layers in an arc

I have the following board design in mind: It's a 4 layer, ~5cm diameter board where 10 slave PCB's will be soldered to it that are connected over the I2C bus. The trace line you see is roughly 8 cm ...
1
vote
1answer
71 views

How to connect the power planes of 2 PCBs with the least stray inductance?

By the nature of my project, I am designing 2 power electronic boards that are supposed to have its high power main voltage and ground plane connected together. Can you recommend a type of connector ...
0
votes
1answer
23 views

Orcad PCB editor warning (Spmhdb-213)

I am new to Orcad. I made some changes in capture and when I am trying to generate netlist using old board as input, netlist file is generated successfully but I am not seeing changes in board on PCB ...
1
vote
1answer
48 views

How to reduce ADC noise through PCB routing?

I am routing a PCB board with some through hole IR emitters and transistors and I am trying to figure out placement of ICs/Op-Amps, as well as capacitor placement and route placements to reduce the ...
0
votes
2answers
72 views

Overlap error (PCB design) using Eagle

The picture shows an overlap error. I am unable to resolve this error and need to know if any rules are broken? The component is a flip-flop resistor (0805-THM, AdaFruit). Wherever I used this ...
2
votes
1answer
69 views

Shielded twisted pair balanced transmission line implementation

I want to send a signal from board 1 to 2 through 20 cm line. I have four channel in differential, First I add them, can I send them through shielded twisted pair like this: Do I need a buffer? why? ...
5
votes
1answer
126 views

How the PCB-A are designed?

I don't know if the question is straightforward. I am not interested in the manufacturing process, soldering, testing, etc. When I am working on a school project, first of all I try my design on a ...
0
votes
1answer
32 views

Doubts regarding via creation using pad designer

I have following doubt on via creation. Is a via surrounded by soldermask or not? If it has a soldermask layer then what happens if there is no soldermask layer around pad? Give me brief explanation ...
-1
votes
1answer
36 views

creation of fiducial symbols in allegro

1.what is proper design rules to create fiducial symbols? 2.How to create fiducial symbols in allegro,and what layers should i give ?
0
votes
1answer
41 views

soldermask top for non plated holes

I am here to clarify doubt on soldermask for non plated holes. I know soldermask is used to protect board from oxidation and prevention of solder bridges and accurate placement of components to be ...
0
votes
1answer
38 views

How to find a male and a female D connectors 15 pins, in altium designer Summer 09?

I need to design a adaptor with a male and two female connectors, pin to pin connected. The connector is a D connector 15 pins. I found a D connector 15, that was what I was looking for, however, I ...
1
vote
3answers
213 views

Transmit 7MHz analog signal from board to board

I want to transmit real passband analog single ended signal with bandwidth, 0 to 7.3MHz, from board to other board. distance from these board will not be more than 15cm. what's the best choice for ...
1
vote
0answers
41 views

Noise and flickering first LED (APA 102)

I'm designing a circuit board to distribute power and data to 8 APA102 strips using a Teensy 3.2. While the first version of my board mostly works, I'm having some issues I'd like to solve for a ...
0
votes
1answer
68 views

How to design RF PCB to ensure the 50 ohm impedance

I do not have any experience designing RF circuits and I am finding many challenges for my project. One of them is to match the 50 ohm impedance that some components demand. In the input of my PCB I ...
0
votes
2answers
63 views

bga pad creation

I have doubt regarding BGA pad creation for SN74CBTLV3245A LOW-VOLTAGE OCTAL FET BUS SWITCH. From attached picture, which should I have to take to create BGA pad type of both NSMD and SMD? How to ...