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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Measuring 0-240v 50-60hz Mains AC with Arduino/MCU

What is the proper way to measure 0-240v 50-60hz Mains AC with an arduino / 3.3v mcu? (Edited to include a diagram of a proof on concept, which is transformerless) Can anyone confirm that this is ...
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25 views

Finding specific components in EDA software

I'm looking for the best protocol for finding specific parts in EDA software? I've been mainly using EasyEDA for the past few months and have enjoyed how easy it is to search parts in the libraries ...
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141 views

I get error while using altium library

I made an integrated library using altium form my personal usage. Everything was OK but today when I want to use this library I get this error while try to use some of the components. [File Access ...
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1answer
55 views

The Component/Parts placement in PCB for future serviceability

Is there a specification or "Best Practices" in the PCB design regarding the dimension between Components? What I need is to minimize the whole PCB board BUT with enough spacing between components (...
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32 views

Eagle PCB GND planes not show after ratsnest command

I poured my polygons on both TOP and BOTTOM layers ,but after i name them and click ratsnest the GND planes don't show up. The autorouter didn't want to route as it was stuck at 00.0% and finished ...
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87 views

Problem with PCB making

I have followed a process to make a PCB, whose link is given below. I have followed the every process as mentioned with correct proportion of chemicals. But, unfortunately, this didn't work (traces ...
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26 views

Design pads and import to OrCAD PCB; or design directly in OrCAD PCB designer after importing other components?

I have a problem with layout design of pad. After creating the netlist and doing the routing, I want to add some single long pads to the board without packages to be able to solder wires on these pads....
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1answer
50 views

how to make different grounding

yesterday when i ask about driving circuit, someone told me that it is a little use in optocoupler when i use the same ground everywhere. because so far (iam a green hand in electronic) i just connect ...
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64 views

Design carbon surfaces on printed circuit boards with Eagle

I am in the process of creating a circuit board that will later be assembled with conductive rubber for the buttons. For the contact areas I found that carbon is used (please correct me if I am wrong)....
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25 views

Options for Routing Medium-High speed Digital Signals to Multiple Devices

I am working on a board with a DS90UB914 Ser/Des from TI which will relay its output data to either a CYUSB3014 or another chip which I have not yet decided on. Regardless, the DS90UB914 has and ...
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1answer
76 views

MC78M12 voltage regulator without bypass capacitors in a simple PCB with only analog signals

I have a very simple board, two layers, two gnd polygons, 8 analog inputs incoming from 8 potentiometers and 8 analog outputs. In the PCB are 2 resistors (R1||R2) between input and ouput. So, output ...
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54 views

MosFet Design Help

I posted yesterday about wondering what diode an SMD component on my board was. Here I am again, wondering if this schematic and PCB design looks reasonable. I looked at my original in hand component ...
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37 views

How can I link two pins in the same route using EAGLE

I'm creating a board that has a ACS712 as current sensor. This little CI has two pins that actually has the same function and are linked internally. What I'm trying to do is link this two pins in the ...
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209 views

Altium Designer update nets in SchDoc from PcbDoc

I have an Altium Designer project with a PcbDoc and a SchDoc file. For some reason a few nets (connections) in PcbDoc are not present in SchDoc. Can I update SchDoc from PcbDoc so that schematic ...
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52 views

Is it possible to calculate the max. permissible current allowed in a power plane?

I need to make a High current pcb board. In accordance to the IPC 2221, the trace width for 30 Amp. with 2 oz/ft2 is 434 mils (I need to use a smaller trace width). I know that the power plane allows ...
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39 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 ...
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1answer
90 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 ...
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82 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 ...
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43 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,+...
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1answer
50 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 ...
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1answer
105 views

Connection of LAN8742A nRST pin causes failure when ESD strike

My circuit uses LAN8742A ethernet phy. The system has a metal case and gets 220V AC to power supply board. After converting 5V DC it goes to my board that has Ethernet and mcu. I screwed case and ...
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1answer
543 views

Review of PCB design L298n

I'm decided to finally make my motor driver boards but I'd be happy to have some feedback as it's my first PCB design. It's mostly based on the datasheet of the l298n chip. So there is nothing much ...
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1answer
138 views

Crossing ground planes with low current low frequency signals

I have a board which has two ground planes, analog and digital, that on this board are completely separate. The grounds connect on another board, which is connected via a flat cable. All signals on ...
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147 views

Why does my IR receiver PCB only work when I touch the sensor pins?

I have designed a PCB based on a schematic which I am pretty sure that is correct and I have tested the schematic several times on the breadboards and all of them worked properly. But, after I ...
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1answer
79 views

PCB 6-layer stackup trace reference

I am designing a 6-layer board, with stackup like this: 1-TOP slow North/South 2-GND 3-Signal high speed East/West 4-Signal high speed North/South 5-VDD 6-Bottom slow East/West PCB plane spacing is: ...
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1answer
67 views

Split Ground plane with motor drivers

This is a PCB with few stepper drivers. I have a question about the ground plane. I have this idea to split the ground plane for each driver, so, I force the return path to pass through the capacitor....
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2answers
392 views

PCB Reverse engineering in ALTIUM

I have to redo a schematic for a PCB. I have a paper version of the schematic, the Gerber file of the PCB and the PCB in a CADSTAR project but not the schematic. I'm using Altium and wanted to know if ...
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1answer
54 views

Which of these board designs is more suitable for a high current circuit?

I'm creating a DC-DC switching buck regulator using the LM2596 5A regulator from texas instruments to convert 12V@3A to 5V upto 5A. Since this is a high current circuit to feed servos, I've tried to ...
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1answer
114 views

Mutual capacitance pads of footprint component

I've a 0402 footprint and i would like to evaluate the stray (mutual) capacitance between the two pads. What i know are l*m : pad size w : thickness of the pads d : distance between pad h : ...
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130 views

cause of photoresist removal after etching

I just tried to do a new PCB today with the photoresist method but what is very strange is that after etching it, I rinsed the board with water and wiped it dry, but as I wiped it dry with toilet ...
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1answer
23 views

SHorting MIPI Mux lines

I am currenty using the TS5MP646 http://www.ti.com/product/TS5MP646 . I need to build a 4:1 mux. I was wondering if I need to use 3 muxes, or can i just short the MIPI traces together and control it ...
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1answer
345 views

Altium Designer Rigid Flex - Placing Tracks Between Sections

I've done rigid-flex PCB designs a number of times in the past but it was long enough ago that I cannot remember how I solved this issue. My design has three sections - the main board, the flex, and a ...
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1answer
75 views

ADC Circuit Review

I'm building a PCB centered around an AD7608 (datasheet) with an ADG714 octal switch (datasheet) to minimize the number of wires required. I seem to be having sporadic problems (e.g. odd levels on ...
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644 views

RN2483 PCB Layout

I am designing a board based on RN2483. As i have none experience on RF design i am following the guidelines from microchip's datasheet as the pictures bellow. So my question is about the many vias....
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103 views

PCB co-planar wave guide isolation

I am working on a design that requires 4 channels coming onto a PCB. The inputs are SMA connectors and are spaced 15mm apart from each other. These signals are routed with co-planar wave guides on the ...
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148 views

Altium Track vs Trace?

In Altium Designer I see in PCB Inspector (Workspace Panel) both Track and Trace objects. In my opinion Track is standard Altium object (conductive path between pads), then what is Trace, and what's ...
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272 views

6 layer PCB layout with RF antenna track

I am doing my first 6-Layer PCB with RF antenna connection tracks. I am using this stack-up: L1 Signal Layer L2 Ground Plane L3 Power Plane L4 Signal Layer L5 Ground Plane L6 Signal Layer I ...
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21 views

How do I copy relays + diodes multiple times in Eagle 7.7 Pro?

I designed a board with 512 latching relays and uC + shift registers to allow changing each relay from NO to NC, or NC to NO, individually. I had the end user wire up several relays on protoboard to ...
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178 views

mosfet substitute

I have a design that requires a certain mosfet. The design is here. This is the schematic I can't find a supplier in Canada that has the Mosfets, m1/m2. It calls for a DMP4015SK3-13. Digikey has a ...
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1answer
76 views

In schematics Design two buses having different names then how their pins can be connected together?

I am referring one schematics design of silicon labs in that at page number 3 page title "EFR32 I/O Port Connections". Pin of bus RADIO_PA[5..0] and WSTK_P[45..0] are connected together how it can be ...
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222 views

Why does this buck boost with dual MOSFETs fails output at certain input voltages at light load?

Buck boost design A buck boost converter for 11A 45V output and 33.0-55.0V input has been designed using the Webench Power Designer. The LM5176 based PCB design was adapted for dual MOSFETs (4 times ...
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1answer
64 views

Frequency range of interest in PCB decoupling network

All the material I found about decoupling write "[...] low impedance in the frequency range of interest [...]" but it's never discussed how this is defined. Does it come from The external noise on ...
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78 views

20A current measurement with hall effect sensor

I am not aware of drawing more than 1A over PCB traces. We are planning to use ACS712 hall effect current sensor linked below: https://www.amazon.in/KitsGuru-KG134-ACs712-Current-Arduino/dp/...
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93 views

Oculus development Kit 2 headset design, main PCB cutout

I've been reviewing the Oculus development Kit 2 headset design. Files here There is a cutout in the PCB that confuses me. It's 1mm wide and there isn't any notch or anything on the assembly to fit ...
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1answer
259 views

Figuring out convenient footprint for given actual lead spacings

This a beginner question, but I couldn't find an answer in net. I want to place the following components call it from left to right Cap1, Cap2 and Res on a PCB: As you see above I also mentioned the ...
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618 views

PCB trace width / via size calculator for intermittent signals

Somewhat a duplicate of Can a PCB trace support peak currents? Are there rules of thumb for a PCB designer to compensate the output of via / trace width calculators to account for cases where the ...
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231 views

Trimmer Capacitor for TX Crystal Oscillator / RF

I'm building a 433.92MHz transmitter. I have gone through some revisions, and have been hand tuning the transmitters. I settled on two 1pF caps, and that has been working for sample units. I got ...
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42 views

Copper Zones in intermediate planes

I am developing a 4 layer PCB using KiCAD. It got 4 layers; Top, bottom, L1, L2. Setting copper zones for the top and bottom layers is common practice. I'm wondering, should I add zones to the ...
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143 views

Problems with PCB Trace / Signal — But Continuity Present

I've been working with a reasonably sized Chinese PCB fabricator, and we've had random problems with boards for the last few months. I'm not an expert PCB layout guy, but we aren't talking about ...
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720 views

In Altium Designer, how do I change the radius during interactive arc routing?

In Altium Designer, how do I change the radius during interactive arc routing? Here the radius is 100mil, but I need it tighter.