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.

230 questions with no upvoted or accepted answers
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3answers
266 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 ...
4
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1answer
256 views

How can I reshape this PCB antenna so that I can still use it with the given circuit?

I'm borrowing the RF design from the MICRF114 Development Kit. Here's user guide- http://ww1.microchip.com/downloads/en/DeviceDoc/50002433A.pdf The circuit I'm using is on p. 35 and the antenna ...
4
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0answers
5k views

Altium Designer: Polygon does not connect to the pads on the same Net

I'm trying to put a plane shield using polygon pour and I realized that some object is not connected to my polygon. In the picture below it is clearly seen that the GND through hole is not connected ...
3
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0answers
115 views

PCB Layout - Ground Plane Clearance Around and Under Ceramic Resonator

We are using Murata's 4MHz Ceramic Resonator (CSTCR4M00G53-R0) in one of our designs and request help in PCB layout design around Ceramic Resonator. The below Murata's FAQs page suggests not to place ...
3
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0answers
64 views

Differentiator circuit sees noise on PCB after 2 min

I'm new to PCB design, and looking for some advice. I designed a PCB shield and I'm seeing a lot of noise in my differentiator circuit. The circuit will run perfectly for about 2 min and then all of ...
3
votes
1answer
199 views

Is there any advantage to using multiple tracks in this PCB design?

I'm fairly new to PCB designing, but I'm loving experimenting with it. Currently, I'm trying to develop a simple PWM circuit using MOSFETs to control an RGBW strip, using an Arduino with an integrated ...
3
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1answer
142 views

PCB Design Specification Document

My company has been designing PC boards since the early '80s. However, we haven't formalized our PCB Design procedures or preferences. Things like preferred PCB sizes, preferred location of mounting ...
3
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2answers
220 views

Why are project files in Altium modified every time they are opened? Is there a way to prevent this?

I use Altium Designer 18. When I open a project file (.PrjPCB), the asterisk ("*") appears next to the project name indicating that the project has been modified, but I haven't actually made any ...
3
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2answers
919 views

custom circle copper fill in ares proteus

My work needs to design a custom circle like the picture below. I need to copper fill the portion in between the two circles. I've tried zone select mode, but it doesn't work efficiently as I need. ...
3
votes
2answers
328 views

12V Relay Voltage Surge on contact close

I'm designing a pcb relay circuit to switch on/off power to an inductive load on a 12V line. I'm using an SPST-NO relay (omron relay) to switch the circuit open and closed, and I'm having trouble ...
3
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0answers
995 views

Tactile switch actuator extension methods?

I am not a 100% sure this is the right place to ask this, but I couldn't figure out another, more appropriate community. I am designing a PCB for a product, which will have a tactile switch. The PCB ...
2
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2answers
54 views

KiCAD: Triaxial Connector Footprint from Drawing

I am planning to use a PCB-mount triaxial connector, CBBJR79TL, in a design for a laboratory prototype. Making reference to the "recommended mtg hole pattern" section from the CBBJR79TL drawing, I ...
2
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0answers
89 views

Hexagonal hatched polygons Altium

I'm recently trying to design a flex PCB. I haven't been able to find any specific tutorials on how to do this in Altium. But I did find Altium blogs detailing some of the best design practices for ...
2
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2answers
143 views

Timing a circuit's 'on-cycle' after a push button switch is pressed

First off, thank you for reading all of this - you are the part of the internet that gives me hope for mankind. I’m looking for a circuit that I would think is relatively straightforward, but has a ...
2
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0answers
90 views

IC package reliability with physical stress

One of the ICs for my design comes in LQFP, TSSOP, QFN and even WLCSP packages. I don't care about the footprint, and the only thing that I want to maximize with the package choice is reliability ...
2
votes
1answer
183 views

Proper way to route high-voltage tracks near THT components

I think this is not a duplicate of this question. My design has the following constraints: type and position of connectors pinout assignments 260 VDC / 2A for high-voltage tracks 12V / 200 mA for low-...
2
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0answers
198 views

Is it a good idea to enlarge LGA chip pads for hand soldering?

I'm designing a board where I'm using an LGA-14 and a WSON-12 chip. Is it a good idea to make the pads bigger, so I can use a soldering iron to apply solder to the pads, place the chips, then reflow ...
2
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0answers
492 views

Altium duplicate net names on top sheet

Hi everyone I've done a fair bit of googling but please let me know if this question is a duplicate or answered in altium design documents. I have a hierarchical design and I needed to separate two ...
2
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1answer
594 views

Altium: board cutouts and multiple flex-regions

I am currently trying to create a rigid-flex PCB in Altium according to the following picture: Purple: this should be the mechanical bard shape ; Red: flex regions basically i want to have a ...
2
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0answers
422 views

nRF52832, using a chip antenna for short range purposes

In the past I have used nRF51822 to make small low powered devices for projects. I have used allready made modules from china (WT51822-S2) and programmed them using mBed. It was really easy but not ...
2
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2answers
78 views

Eagle insists on marking up spaces which are larger than the minimum specified in the DRC rule

This is what my clearance rule looks like: My grid distance looks like this: And the final result, after DRC, looks like this: As you can see, although not by a very large margin, the distance is ...
2
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0answers
102 views

LM4510 Switching Converter not working

I am using a TI LM4510 converter (datasheet) to step up from 5V to 12V (adjustable). I have good input power, enabled chip, and followed datasheet, but the output voltage is actually lower than the ...
2
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0answers
166 views

Text LCD doesn't function normally on mixed-signal PCB?

I have power supply, analog part and microcontroller part on one 2-layer PCB board, very simple. The LCD is on the microcontroller part. It works normally when I have it on a separate board with only ...
2
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0answers
273 views

fiducials on a panel

have a little question about fiducials: My Layouter/My Boss likes to use 3 fiducials on the panelframe and one fiducial on each individual board in the panel. My job is to build the program for the ...
2
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1answer
1k views

Designing a DC 12V 80A Power Distribution PCB panel and heat sinking

Background I'm trying to build a small hobby grade ROV for an underwater robotics competition held at the university I'm studying. And I have used eight brushed dc motors each of which consumes 8A on ...
2
votes
1answer
463 views

Advice for Grounding and Shield Placement

I am working on a board design which includes an ADC and a DAC. The board attaches to the headers of the Mojo V3 Spartan 6 FPGA Dev Board. The ADC has to pick up a quiet signal at the same time as the ...
2
votes
3answers
155 views

Heat dissipation by convection for ICs placed upside down

I'm currently designing a PCB with a couple of fast electronic elements (600MHz ARM, DDR3 ram etc.) and I'm quite puzzled which layer should those elements be placed upon. The product will be closed ...
2
votes
2answers
294 views

Clearance through pcb

I've become fairly familiar with the clearance and creepage requirements of UL/IEC/etc 60950, 60730 and derived/related standards. I've just realised, though, that they only refer to distances through ...
1
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0answers
51 views

PCB Single Local Fiducial

I have a question regarding local fiducials so as to achieve proper alignment of the board, during the soldering of a 0.4mm pitch chip. As I have seen the best practice for local fiducials is to place ...
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0answers
22 views

Ctrl+Right Arrow shifting component left in altium layout

After doing flip and rotation of entire board, I see Ctrl+Right Arrow shifting component left, this is not normal as per specified Altium Short key. Please help me to solve this issue ?
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0answers
40 views

Custom pcb with 32U4, USB not working

I am wondering why USB isn't recognised at all. I followed Sparkfun Pro Micro specs. Firmware upload works fine (Adrduino Leonardo) Any help welcome !..
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0answers
24 views

TP4056 and ST32F103C8T6 shorting after few uses

Complete schematic: Top part: Lower part: This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
1
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0answers
41 views

Voltage spikes caused by stray wire

I recently had a PCB designed which has several analog, digital, and power elements. The board is powered by 24Vdc which is stepped down using an LDO to 3.3V and 5V. These voltages are used to power ...
1
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0answers
71 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, ...
1
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0answers
129 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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0answers
44 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, ...
1
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0answers
122 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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0answers
179 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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0answers
87 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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0answers
43 views

analog and digital ground connection point selection

I've read some articles that say the connection point of digital ground and analog ground should be at the power supply output port. However, when there are two or more power supplies which are ...
1
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0answers
60 views

Altera/Intel FPGA Interfacing External Memory

I am in the process of making a prototype PCB with an Altera Cyclone IV or V FPGA and 2 channels of external memory, one channel for a softcore CPU and one channel for a 2d graphics accelerator. I ...
1
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1answer
49 views

Layout design in a board with Ethernet Controller and Connector

I received a task to review a board with ethernet controller W5100 from Wiznet and Ethernet Connector. It has SIM800L module as well ESP8266 uC. I cant give lot of details because confidentialitty. As ...
1
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1answer
169 views

Arduino PSU with battery backup (SLA) and mains/battery monitoring

Please could somebody review my following schematic, as it is my first attempt at a PSU circuit. The aim of this circuit is as follows: I am using a 15V (150W) PSU to power an Arduino, 2 separate 12V ...
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0answers
63 views

Reason for stepped pins on M12 circular connector

I've been looking at M12 circular connectors for a project I'm working on (for example this one, drawing here), and I've noticed that many/all of them have stepped pins that create a 3mm or so offset/...
1
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1answer
130 views

Heatsink pad connected to ground pins

Is it safe to use the exposed heatsink pad of a QFN to also connect the ground pins of the IC? (Like this question, but in my case the pad has many vias connecting it to ground plane.) Additionally, ...
1
vote
1answer
140 views

How do I read the dimensions to create a PCB footprint?

I'm trying to make a PCB footprint for the SSD1306 ribbon strip, and am unsure of the correct dimensions for the solder pads. The horizontal dimensions are clear enough but I don't know where the pads ...
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0answers
74 views

Does regularly spaced via stitching contribute to standing waves on an RF PCB?

Should vias be irregularly spaced? Can consistent spacing between ground vias create standing waves. Has anyone ever heard of this? I've been doing this for awhile and I've never heard this and ...
1
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0answers
67 views

GPS PCB RF Design and Performance Impact

I have designed a vehicle tracker for two-wheelers which is installed in 500 bikes. I am facing an issue with GPS performance (lock percentage is quite low for more than 75% bikes). This makes me ...
1
vote
2answers
175 views

PCB input smoothing capacitor layout

I got some 0.1uF ceramic capacitor in front of my mcu IO pins to smooth the inputs values/spikes I was wondering if this placement is bad or not because their position is "over" the input so maybe (...
1
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0answers
35 views

MCP4011 - Exposed pad - connect to GND?

I'm planning to use an MCP4011-xxx/MC (DFN version). This package has an exposed PAD. But nowhere in the datasheet, I can find the information if this exposed PAD should remain NC or tied to GND/VSS. ...