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.

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118 views

High Voltage on PCBs: design and layout questions

I am designing a PCB that has high voltage (DC) on it. It will be located on a CubeSat (so, space). The PCB (HV-PCB) will receive the HV (3 kV max) from a DC-DC converter through a Coax cable; the ...
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1answer
106 views

Advice on battery powered ESP32 with NFC Design

I'm new to PCB design (First one) and I want some advice and tips from more knowledgeable people in regard to basic design elements and especially the power consumption part. I want to make the ...
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1answer
89 views

KiCad problem, schematic to PCB layout generates empty PCBnew window

I am using KiCad 5.0.0, after I built my schematic I annotated schematic symbols, assigned PCB footprints to the schematic symbols, then generated the netlist, and finally when I clicked on the tab of ...
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1answer
47 views

should land patterns match the typical or the maximum part footprint dimension?

I've read that for QFN packages at least, the width of the pads on the board should exactly match the width of the feet on the bottom of the chip. However, the datasheet for the part I'm working with ...
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1answer
40 views

Non-shortest path traces [duplicate]

Inside a Nintendo Switch I spotted some traces that take a meandering path to the RAM chips. What are the benefits of designing it this way, instead of taking the shortest path?
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2answers
52 views

Is it ok if I use all pins on non AC connector for AC

I intend to use non AC connector Hirose DH40 and DH37 for single AC line (230VAC). Connector single pin is rated 30V 0.3A. They did also did a test for 100VAC for 1 min. Plan is to use two ...
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1answer
48 views

Looking for an AC socket that mounts to a PCB

I'm looking for an AC socket (U.S.) that mounts vertically (not right-angle) to a PCB for a smart power strip project. It should have through-hole or tabbed connections that I can solder into slots or ...
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1answer
108 views

Why is via fencing not used to cover the whole PCB?

Via fencing is used to reduce electromagnetic interference in critial parts of a PCB. My question is, why do we not just cover any ground pour of the PCB with via fencing? Are there disadvantages that ...
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2answers
125 views

8-layer Stackup: 3 cores vs 4 cores

For a new project I am looking to use 8 layers and I am currently figuring out the layer stack I want to use. As for usage, I will most likely go with: Top GND Plane 1 Signal 1 Power plane 1 Power ...
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1answer
51 views

Is there a way to prevent switching layers when laying tracks in KiCAD?

When I lay tracks in KiCAD on the back Cu layer (v5.1.0, Windows) I have the front Cu layer toggled invisible in the layer manager. I also have the selector arrow set to the back Cu layer. I have ...
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4answers
6k views

What are the advantages of this gold finger shape?

Some PCBs, like the PCI card specification have gold fingers which start very narrow near the bottom edge, and gain their usual width much higher, where the actual contact is expected to be made. ...
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4answers
2k views

Super Duper Vdd stiffening required on 555 timer, what is the best way?

I am using a 555 timer for a (16bit) frequency sensor/counter. It works by counting the number of pulses read in the 125ms sample time set by a 555 timer; resets & repeats... I am using the ...
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0answers
74 views

How to calculate MOSFET temperature increase in PCB

I want to calculate MOSFET(DATASHEET) temperature increase for PCB. MOSFET - FDD86250_F085-D Totally 13 MOSFET's will be mounted in PCB. At the same time, maximum 8 MOSFET's will be used in PCB 1, ...
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2answers
530 views

In a 2 layer PCB with a top layer densely populated, from an EMI & EMC point of view should the ground plane be on top, bottom or both and why?

Suppose I have a 2 layer PCB with the following characteristics: Top layer is relatively densely populated by both THT ad SMD components Bottom layer has very few traces Among the following, what is ...
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0answers
62 views

PCB design in class D amplifiers [closed]

in the process of building a class D amplifier I am now stuck at the point in which I have a lot of audible noise and I don't know where this is coming from. I know there could be a lot of causes but ...
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1answer
146 views

Attaching a circuit on to a PCB

Currently I have a circuit on my breadboard but the problem is I have no idea how to paste this circuit on the zero PCB board. basically the circuit I created was using LDR, transistor, LED and a ...
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0answers
164 views

Gerber viewer confusion - missing traces

I'm not sure about my gerber files. I guess there is something wrong. In different gerber viewers the PCB looks right. But in online viewers from JLCPCB and PCBway, the bottom view looks wrong. Some ...
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2answers
75 views

VME64 vs PCI Bus for vibrating environment

I have to select between VME64 bus and PCI bus and one of the important decision metric is concerned with the connector types used in these buses. My application is in a vibrating environment. I ...
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1answer
25 views

What does the layer structures and the macro structre describe in a LEF file?

I want to know what is the exact format of a LEF file. For example, I have the following format of LEF file ... I want to know what the layer and macro structures describe. Also, how many layer and ...
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2answers
483 views

What is the point of these components on the schematic? (Digispark ATtiny85)

The above schematic is for the Digispark ATtiny85 development board. I am still fairly new to electronics, however I understand what all these components' functions are. I am just not sure why it is ...
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1answer
79 views

Only charge capacitor when button pushed then turn on 12 VDC motor momentarily with capacitor when button released [duplicate]

Can I turn on a DC motor momentarily with this circuit if I replace LED with 12 VDC motor? I need help making a circuit to turn on 12 VDC motor momentarily with push button. So if I push button, the ...
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1answer
51 views

Marking 3U board size on a 6U board in Altium

I have an Altium design of a board which is 6U size. I want to mark 3U size on it using some line-drawing. As I don't have hands-on on Altium so struggling to do it. How to know the size in Altium as ...
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0answers
53 views

Planar Transformer Design and Insulation Requirements

I am currently thinking of designing a planar transformer for my SMPS application. The input voltage will be somewhere in the region of 150V, the output voltage in the region of 1.5kV. First of all, ...
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3answers
84 views

Power planes in PCB

I'm designing my first PCB (two layer), the project is for an amplifier based on OPA2134. The design/amplifier requires to have +12V, GND and -12V. The power for the amplifier comes from a ...
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0answers
201 views

Importing EasyEDA project to EAGLE

I have a problem with uploading my EasyEDA project to EAGLE. Is there a way to open project from EasyEDA in EAGLE, I'm unable to find anything about it. EasyEDA exports files in .json format.
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2answers
109 views

Copper layer delaminates on Printed Circuit Board

I have been making the PCB boards by the conventional process since last few years (pressing, etching, drilling, soldering). I usually iron the photo paper to the PCB board for around 15-20 minutes ...
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1answer
165 views

Minimum requirements to interact with PCI Express

I have a relatively simple project (from the user point of view) in mind. I want to develop a very simple PCI Express (x1) card that users can put into their system and toggle some GPIO's from a GUI ...
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0answers
72 views

GBE (Gigabit Ethernet) Magnetic Coils Connection Order

I am designing a MEZ PCB and I need to connect the GBE coils to the assigned pins of single board computer's MEZ connector. My trouble is I do not want to use any more via for this connections. Hence, ...
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4answers
411 views

Which is the preferred approach to PCB layout for signal vs power traces in analog circuits, and things to consider?

I have had to layout 2 layer PCBs several times now for analog signals, and am just beginning to learn the process. I often face a similar question in one form or another with regard to laying out ...
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2answers
82 views

Is a ground plane meaningful even where the signal return path is not through ground?

I'm designing a two layer PCB for a keyboard where most of the board space is taken up by the key switches and backlight LEDs. The switches have a traditional switch matrix configuration with diodes ...
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0answers
73 views

Clapp oscillator PCB not working when ground pin is connected

I have designed a Clapp oscillator working at 25MHz. The catch is I designed the circuit to be a part of frequency compensation network. So, I incorporated a few reverse-biased varactors whose ...
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1answer
97 views

How to reduce guard gap of a component in Proteus

I need to reduce the guard gap on a connector of Proteus but I can't find the option. I think it is possible to modify that by modifying it as a property of the package footprint but I don't know how ...
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1answer
45 views

Minimum distances between box case connectors and PCB surface conductors

I am working on a few kV PCB design with external voltage connectors (HIGH and GND levels). So user interface connectors are thought to be bananas jacks (they support until 7kV but has soldering ...
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2answers
118 views

High Speed PCB routing [closed]

I'm a new hardware design engineer. I have a few questions about high speed pcb design. 1) when I search high speed pcb design, I saw pcb routing like snake. What is this ? 2) When I draw a high ...
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0answers
47 views

BQ2057WSN Circuit Heating issue

We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
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2answers
184 views

How to increase pcb trace width after fabrication

I am new to pcb design and my first designed pcb is burning, I have checked some traces and I found this: C18 capacitance is 0.1uF and 100V rated. The problem is that slim trace width is only 0.2mm....
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1answer
133 views

What is this connector symbol?

I'm working on a PCB design homework in PADS and I've come across a symbol that I have never seen (circled in red below). It is of a filled in rectangle with a triangle below it. I'm thinking it ...
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2answers
235 views

What are important uses of the “Net Tie” concept?

My understanding is that the "Net Tie" is a concept introduced by Altium and useful for Kelvin connections of a sense resistor and can not be applied in any other case. Although it seems to be a ...
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1answer
33 views

Connect multiple source pins together to power signal in Eaglesoft

According to PCB shown below, I have a bunch of MOSFETs with HSOF package with 7 pins of source for each and failed to connect EVERY pin to the connector. In other words, when routing the source ...
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1answer
223 views

What are these wiggly USB 3 traces on my motherboard?

I was taking a look at my motherboard, and I noticed the above traces on the USB 3.0 ports. A bit of prior research: The C34WH IC is probably a SN74LVC2G34 Dual Buffer Gate. Unclear what chip the top ...
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0answers
182 views

Please check my board design before I waste money

TL;DR: Please make sure my schematic and board design won't blow up on me. GitHub Repo if you're feeling extra thorough. Project overview I am trying to create an Arduino based Bluetooth RGB led ...
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3answers
74 views

EFT Design training

My team is responsible for designing industrial electrical devices. We had successfully designed several devices before. Recently, we are designing products that have to meet IEC 61000-4-4 class A ...
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0answers
91 views

How to know what is the safety standard to apply to a PCB design?

I want to design a PCB with some points at some KV during certain times, less than 10KV and no more than 30mA of current. After dealing with concepts and getting the main idea about my circuit needs, ...
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2answers
77 views

SOIC-8 IC input pins small spacing at high voltage

I'm looking at a high common mode voltage difference amp (AD629). The input voltage between the two input pins next to each other will be 150VDC. Normally the pads should be bigger on the PCB than the ...
5
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1answer
102 views

Barrier and slot within reduced area on a PCB

Imagine this situation in a little area of your PCB: According to the worst case and used material, I need a creepage distance = 30mm. According some tables, clearance must be 30mm. First Red banana ...
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2answers
82 views

Why do these modules not include IPEX and trace/chip antenna connections simultaneously?

I'm looking a bluetooth modules for a project i'm working on. I want to have a small form factor version of the board be usable with a trace or chip antenna, and have the option of connecting a ...
1
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1answer
45 views

Ondulatory routing in Raspberry Pi [duplicate]

I bought a Raspberry Pi and I noticed some of the routings are not straight lines but instead they make a funny ondulatory shape (see picture at the right and bottom of the processor). I'm not sure ...
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5answers
168 views

When to use slots instead of barriers in high voltage design?

I have read a lot of information about the clearance and creepage strategies, distances, materials, etc.. I am designing my first HV PCB, main LV circuit will be on TOP and HV (6KV) on the bottom. ...
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1answer
51 views

Logic gates for relay coils analogic control signals

I have 2 external signals arriving to my board, A and C. B is generated inverting A. They 3 will be used for generating 3 switch control signals: A', B', C' at every point (there will be 8x3 24 switch)...
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1answer
75 views

Help Identifying Parts of a Battery Management Board

I am currently way over my head in a personal project to design and create a 5 cell battery protection system. I'm fairly confident that I've correctly cloned the cell balancing section (section C) of ...