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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What Common Mode Choke choose for EMI filtering at 250v

I'm designing a PCB with a microcontroller that have to handle 3 Relays. The main power source is an AC Inlet socket 250v, the maximum current for all the circuit from this source is 15A (I included a ...
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1answer
19 views

Altium 3D View not showing properly and Via placement problem

Can some please tell me how to fix this? I select all 3D views but every time I get transparent board. and when I try to place a via for routing it moves outside of the board. need help.....
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22 views

Confirming validity of schematic for dual stepper motor PCB

I'm trying to make my first schematic for a PCB that would sit atop an RPI and allow for control of two stepper motors. I have an LM2576 to take 12v from the motor supply and step it down to 5v for ...
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28 views

Power supplies separation in PCB for an Arduino-like Shield

I could not find a cut-dry answer anywhere on this issue and I'm struggling a bit on the design of a PCB. Note, this is the first time I design a PCB, and this issue is actually not so relevant, but ...
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94 views

Can someone double check my PCB?

This is my first 'real' PCB, since it also contains AC power together with a bit of DC it would be awesome if someone could check my design. Description: I'm building the MPCNC project and would love ...
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33 views

Product Description for EMC test

I'm writing a document that should explain about a mini-PC in my company in order to give information for EMC test engineers who don't know the product. The mini-PC introduces high granularity modular ...
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1answer
21 views

Any suggestion for surface mount oscillator (XO) PCB Layout guidelines?

I've searched for PCB Layout guidelines related to surface mount oscillator (XO). I only found A LOT of application notes for oscillators based on pierce-gate topology but not for surface mount ...
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38 views

Need help with power supply circuit

i'm currently designing a device which uses GSM module. which works on 12V and if the main supply is not there, it will run on battery. right now i'm facing a problem in power supply circuit. i'm ...
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30 views

Programming SPI Flash that has more than one device connected to it

I'm designing a PCB that converts from PCIE to USB. In my design, I'm including an SPI female header where I can connect it to Dediprog through male connector where I can flash the FW of the VL805 USB ...
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46 views

High current PCB traces

I am doing a PCB layout with one +12VDC input fused at 20A which breaks up into multiple fused branches that vary from 2 to 10A each. The input is a screw terminal barrier block and the fuses are ...
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27 views

Can I make PCB panel with PCBs with defined assembly variants in Altium designer?

I have two PCBs that make one system, each PCB have two assembly versions. I need to make PCB panel that contain one of each PCB with right selected version. It is possible to make PCB panel just for ...
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25 views

Altium Footprint has a huge room than the footprint itself

I have a problem regarding footprint clearance or something similar while using Altium 18.1.11. The problem occurred as I designed a Pad with via on it but when I imported it to the PCB doc, the part ...
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58 views

Buck converter placement on PCB

I want to place this XL4015 buck converter board on my PCB. Is it reliable to mount this module directly above digital logic IC components using spacers? I am not sure if the module has a good ground ...
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26 views

Change FPC Pitch

I recently had a PCB made with a FPC on it. Unfortunately its the wrong pitch (Yes really stupid oversight) and so we need a solution that doesn't involve ordering a new board. The board has a 4 pin 0....
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86 views

Power Supply Layout

Edit: Thank you everyone for the amazing feedback! I am definitely going to do more research and make the suggested improvements :) I have just completed a 24V, 120W power supply layout, and I would ...
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56 views

PCB manufacturing - Why etch resist such as Tin is removed after the etchant has removed the unwanted copper

Alright so I'm learning the PCB manufacturing process. I have seen many professional PCB manufactures use "Tin" to be used as an "etch resist" which protects the copper traces ...
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10 views

Working with Mentor Graphics xPCB Planner\xPCB Layout and OrCAD

I'm working with Mentor Graphics xPCB Planner (very similar to xPCB Layout) for placement and OrCAD Capture CIS 16.5 for schematic design. I'm interested in working with both tools in parallel, where ...
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27 views

Micro Cat Tracker PCB design

I would appreciate any advice how to improve PCB design to achieve the highest sensitivity for the GPS signal. The design is based on S76G chip. The tracker will be sewn or encapsulated in plastic ...
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29 views

Power planes vs power tracks?

I'm working on a 4 layers project - 2 signal layers (top and bottom), one internal ground plane and a "mixed" power tracks and ground internal plane which is the object of the question and ...
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1answer
45 views

Noise that resets a device that I would like to avoid from chip reset pin

History/context: I talk about a 15Mhz noise when drill machine or any kind of machine activation in my network, before, at other post. By the moment neither RC, RL or RLC butterworth low pass filter ...
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1answer
46 views

tear drops disappearing during mirroring in altium

I have recently faced a problem...whenever I mirror my pcb by using the shortcut>>M+i all of the tear drops which are defined in my design will be disappeared! does anyone know why this problem ...
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24 views

Is it possible to mount a 7-Segment on an FPC and what points need to be considered?

I am designing a project with a flat flex PCB, in which I would need a 7-Segment display similar to below picture. I would like to avoid to add an extra PCB with a connector or hot-bar just for the ...
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1answer
104 views

PCB routing of SPI lines

I'm new to electronics in general so please don't assume any prior knowledge. I'm developing a control board and I've already had the first revision manufactured. Everything worked as expected with ...
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52 views

Generic tablets and single board computers

I've been pondering the idea for a while now in regards to a project I've had in mind. Essentially, I was wondering how I would go about obtaining generic tablet/phone motherboard designs? Would I be ...
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33 views

Filtering Ethernet lines

I'm designing a product where we have an ethernet cable from a Raspberry Pi inside the machine going to a PCB with two RJ45 connectors on it placed at the back of the machine. This "routing" ...
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22 views

Lipo Batteries PCB

I'm designing a custom devboard that supports lipo battery but I can't find any resource whereas what type of connector I need in the pcb, nor the connector per se or the footprint. Can someone help ...
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35 views

Creating large custom shape pads in Autodesk Eagle

I'm pretty new to Autodesk Eagle and trying to design a captive soil moisture sensor probe in Eagle. The shape I'm trying to create is: I would appreciate it if anyone can help me with any advice on ...
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25 views

32U4 based board sometimes does not run setup

I have a custom PCB using 32U4. Sometimes when I switch the board on, the code of setup() function does not run. But this is quite unfrequent, the board usually works fine. This just happens from time ...
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49 views

I need to open a .brd or. sch file in proteus professional. What should I do?

I want to simulate a project which is in .sch and .brd files. So I've installed Proteus pro 8.10. Now I can't open the project in it. What should I do now?
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17 views

Proteus turn off automatic re-tracing

Is there a way, to turn off or set up to a button - the retracing of components(change of where the green lines connect), I came from old versions of EAGLE and there was a button for this, in proteus ...
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41 views

Digital and Analog Power and Grounding

I have been reading about grounding lately because I learned that this issue is very important for high frequency design and I got the idea that we have to think about the return current to avoid ...
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30 views

About hole diameter size, tin diameter size and solder mask diameter size for pad of through hole components in Altium PCB design

Is there any rule that relate the tin diameter size and solder mask diameter size with the hole diameter size for the pad of through hole components in Altium PCB design?
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47 views

Magnetic RJ45 question. PCB to PHY 8 pins vs 12 pins

So I am working on a design where we are replacing a RJ45 PulseJack J0011 connector that has the magnetic transformers built in with a RJ45/USB combo jack(with magnetic transformers). I found an ...
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23 views

How to create/optimize a matching circuit in the middle of a PCB with a network analyzer?

I have a PCB with an SMA connector as only input. The block diagram of the circuit looks like: I would like to update the L-match for optimum matching (L, C1, C2 at 915 MHz). I connect a VNA to the ...
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43 views

Problem with CH340C

Hi I made a board that contains an ESP32-WROVER and an USB to serial adapter ch340c but it's not visible when I connect it to the PC (Windows 10). I tried to install the ch340 driver and I even tried ...
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87 views

CN3722 solar charging IC not working properly

I'm currently working on a custom PCB where I have a microcontroller hooked up to 3 LiIon batteries which are meant to get charged by a CN3722 IC. However, when I connect a solar panel to the circuit ...
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32 views

Incorporating Additional Devices in Custom PCB

I've been tasked with designing a custom PCB based on a prototype I made this past year. This prototype uses ST's NUCLEO-F030R8T6 development board along with some stepper motor drivers (AMIS-30543) ...
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2answers
33 views

PLL Layout guidelines

I am designing a custom board using HMC833LP6GE. I am taking schematic reference from the Evaluation module. There will be onboard DS-PIC MCU for controlling the PLL. The reference input can be fed ...
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1answer
38 views

Difference between EMI filter and RFI filter

I always see EMI filters on power entereing of machines. They have generally circuit something like a below: The machine that I investigad has noise limitter filter that called RFI filters on ...
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23 views

Reducing Thermal Pad Size Below Official Footprint - Can It Create Manufacturability Problems?

I'm using a DP83867 Ethernet chip by Texas Instruments in an S-PQFP-G64, 10 x 10 mm package, the mechanical dimension and its recommended footprint are shown at the end of the question. As shown, the ...
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62 views

Would a SIGNAL - GND - SIGNAL - 3.3v PCB stack okay?

The Typical 4 layer PCB stack up would be Primary Signal GND Vcc Secondary signal And i have always used this on my 4 layer projects. On this current project however the Back side of the PCB is ...
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58 views

Overkill battery charging circuit?

I want some experience in designing electronic circuits, and have chosen to build a battery charging circuit for a possible future PCB. I've tried to follow all the advice I can find online about ...
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20 views

How to select the setup time and Hold time for the DDR3/4 SI analysis?

I am performing SI EYE analysis for the DDR3 interface. Following are my consideration for the DDR3 SI analysis:- Data rate= 800MHz/ 1600 MT/s Data UI = 0.625ns = 1/800MHz Address, command and control ...
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60 views

Should I remove the solder mask from an isolation-barrier?

To be able to fully utilize the isolation properties of digital isolator ICs such as the ISO7731, the PCB must have an isolation barrier that is accoding to datasheets Free from planes, traces, pads, ...
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15 views

How to Fix 3D view component in proteus

I am trying to use some components from arduino schematics in my design. Specifically ...
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52 views

Feedback on 2.4GHz RF circuit design

Looking for some feedback on this RF feedline and antenna area. Starting from the MCU pins, we have: Murata RF connector with integrated switch (MM81302600) - for inserting the VNA and tuning the PI ...
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28 views

How to make ONLY a stripline (no parts) on a multi-layer board using Altium

I'm a beginner at PCB design and Altium. I'm trying to make a 50 ohm stripline using two ground planes, two dielectrics and one signal layer sandwiched between them. There are no other components on ...
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1answer
54 views

Mezzanine board connector recommendation

I plan to develop a mezzanine PCB intended to sit in place of two ICs in an existing circuit and replace their function. Height is limited as the device is only 1U high in total. One of the original ...
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62 views

Altium BGA fanout problem

I have a problem with Altium fanout. I can not use fanout with my BGA processor (AM335x,) but fanout is working on DDR3 and eMMC. I did the same things with DDR3 and the processor but fanout for the ...
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63 views

Should I (and in what degree) be concerned about EMI/RFI shielding?

I am starting on designing a sort of HAT (like used on the RPi) for the Nvidia Jetson Nano. As I am on my third year of electrical engineering I know little to nothing about EMI and shielding. Should ...

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