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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52 views

Sizing Through-hole Vias for Power Traces

I am trying to understand what size vias I should use for my 5V power traces. The trace typical runs at 0.5-3 amps and is 2mm and about 150mm in length. The width is huge, but I do have the extra ...
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51 views

Cross-Talk/Interference between UART Lines on a PCB

I am wondering at what distance UART lines begin to interfere with each other? And can I expect the UART lines below to function properly? The PCB board below has 6 UART lines running alongside one ...
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How can I add reference return path via (ground via) in a symmetric way in PCB Editor?

I would like to add symmetric via (return path via in the middle) using PCB Editor as shown below. I can add via manually. I just wanted to make sure it is symmetric to the two diff-pair fanouts as ...
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16 views

Powering On/Off Quectel BG95 LTE & GNSS module

I have a Quectel module of the BG_95 series, for LTE and GNSS. Haven't gotten to use it but am trying to integrate it with a PCB. In the hardware design guide they list a circuit for powering off ...
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57 views

PCB routing of parrallel capacitors with different values (Based on STM Nucleo64 dev board)

I have been recently trying to understand how the STM32 ICs should be routed on PCB, in particular parallel capacitors of different values for power design. I have come across various suggestion about ...
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32 views

STN1110 UART-RX-LED is flashing rapidly

I did a pcb mount for a stn1110 "Multiprotocol OBD to UART Interpreter" and followed exactly schematic from datasheet. The issue I have is that after is starting, there is a sequence of ...
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50 views

Raspberry Pi CM4 I/O board 2-layer PCB design

I am a beginner in PCB designing, well in past experience, designed an PCB with some sort of digital signals, power (AC/DC) lines and USB. Now I am working to design the PCB for CM4 I/O board with ...
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43 views

On a PCB, can an antenna for 433MHz RF be “far” from the transceiver?

When I design PCBs I always try to keep antenna as close as possible to the transceiver. Now due to the design I need the transceiver schematic on the left side but the antenna on the right side of ...
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45 views

Custom Board MCU Troubleshooting

I have designed and assembled a custom PCB using an ATMega32u4 MCU which runs the Arduino Leonardo bootloader. The board powers on and the ISP can detect the MCU and flash firmware, but USB ...
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Altium Designer 21 Duplicate Net Name Error

I have a design that is erroring at compilation time with (among other errors) a bunch of duplicate net name errors. I have searched around including reading up on the top result for this problem (...
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22 views

I/O voltage compatibility checks as part of design rule checks during schematic design

Schematic design programs have concept of design rule checks. What exactly does this feature check? Can it check if the input voltage on different pins of an IC is compatible with its I/O voltage? For ...
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Isolated board design suggestions

First of all thanks for reading this post. I am designing an isolated board for several peripherals for which I need your help/suggestions. The board contains a buck converter (like LM2596) to step ...
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36 views

How do cheap Raspberry CSI-2 cables get around differential impedance matching

I am trying to design a circuit on (double sided) flex PCB that happens to have CSI-2 signals on it. I would like to find out what is wrong with my deductions presented below, or what part of ...
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23 views

optocoupler PS2501L-1-F3-A

I hope everyone is doing well. I am newbie in the electronics world. The optocoupler is PS2501L-1-F3-A. the 'In' is supposed to be the input of a dry contact ( GND or floating state ), In the ...
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53 views

Is it possible to run a small circut off the power that is output from a unpowered headphone/speaker?

So I'm currently dreaming up my first PCB project! I would like to make a 1/4 audio switcher for my current audio setup (two outputs 1 input) I'm fairly new to electrical engineering I'm about 3 years ...
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LED Array Controller Circuit PCB Design Questions and Feedback

Background I'm designing a LED controller based on a Teensy 4.1, some AD9833 Function Generators and some TLC5948 LED Drivers. I'm aiming to make an instrument of sorts, specifically a POV display ...
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40 views

Best practice for multiple SMPS-generated power rails at different voltages on PCB

When creating a PCB design with multiple power rails at different voltages, all drive by switching power supplies, is it better to generate all of the voltages from a single input voltage, or two ...
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PCB Raspberry Compute Module 4 Carrier Design

I'm working on a PCB Carrier Design for Raspberry Compute Module 4, I have and question for PSU module. I want to supply it with +5V, 3A, and use the same USB-C Connector to Data Transfer to eMMC for ...
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Why has the auto-router put my PCB traces on two different layers?

This is my first PCB design. I want to design the PCB layout of the following switched mode regulator: This is the resulting PCB layout in which I've placed my components and the auto-router function ...
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1answer
38 views

Ground Reference for multi layer board

I am currently designing a multi-layered PC board and there is situation where signals are referencing the ground plane meant to be used for the 3.3v supply. So, for example. I have a 3.3v plane on L8 ...
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1answer
23 views

Is there a way to increase space between connections and ground planes in eagle?

The below picture is a screen shot from eagle. The red shade means gnd. Is there a way to increase the space between where the connection goes and the red, gnd, plane? I'm paranoid I'm going to solder ...
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28 views

Is there anyway to get a more solid connection from pads to planes in Eagle pcb layout?

Below, in blue and white, is the suggested pcb layout from the data sheet: https://www.mouser.com/datasheet/2/468/RPX_1_0-1903909.pdf and here is my pcb layout from eagle as you can see in the data ...
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91 views

Connecting analog GND and power GND

I need to connect a power ground and an analog ground. The power ground is a SMPS output. The analog side consists of 8 opamps and their resistors and capacitors. What's the best way to connect these ...
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1answer
69 views

Getting signal from high voltage side of PCB to low voltage side

simulate this circuit – Schematic created using CircuitLab I am designing a PCB that has both a high voltage side and a low voltage side. They are separated by roughly 8mm. There are I/O lines ...
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63 views

selecting the footprint size of ceramic capacitor for MCUs

I have noticed there are different sized(SMT foot print size) ceramics capacitor with same voltage and capacitance ratings. I have been told that smaller the footprint, smaller the parasitic ...
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73 views

This LM311 powered LED is not activating properly

I am taking the tractive voltage and dividing it by a factor of about 20 and comparing it with the reference of 3V. If the tractive voltage is 80V, that should be divided to 4V and that is greater ...
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2answers
87 views

PCB designing consideration of high speed (0.5 Hz) relay load switching

Can this design cause any problems? I'm planning on switching 75W (220V) loads with this relays. I'm using 10 such relays and terminals (HB9500M). Note that it's highly unlikely all of the relays to ...
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1answer
19 views

Altium Shortcut to cycle through all PCB layers one by one

I wonder if there is any shortcut in Altium to cycle through all layers of a multilayered PCB one-by-one? That is to say that when the shortcut is first entered 'Single layer mode' is selected and ...
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2answers
79 views

PCB 6-layer stackup problem

I'm currently designing a PCB with double side components and I'm limited to 6 layers max. The project has couple of MCUs at 84 MHz. There are USART, I2C, SPI, some analogue lines and high-power lines ...
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1answer
60 views

KiCad generating blank PCB when building from schematic

I'm relatively new to KiCad, but I've had some success in the past generating boards and having them manufactured - though admittedly it's been a while. I'm using 5.1.9 on MacOS 10.14, and I've ...
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90 views

Do all SDRAM applications require high-speed routing?

I am a chemistry student and I am beginning to realize that I have fallen into a EE rabbit hole.. I am trying to create a PCB (digital audio delay unit) from a schematic which includes a SDRAM, this ...
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93 views

Can a similar crystal and not exactly the one on the datasheet be used on RF 433 receiver?

The datasheet of SYN531R suggests 13.51783 MHz crystal. I found available available 13.52127 MHz on an online store. It seems very similar to me, however in reality would it work and if yes, would it ...
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42 views

How can I fix 3D viewer problem on KiCAD?

I am designing a circuit on KiCAD. I added new components to footprint with 3D models. When I open 3D viewer in footprint editor, everything looks fine however when i use the component and open 3D ...
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96 views

How to choose the correct transistor?

I am having trouble understanding the definitions for the transistor. I am checking many different transistors and unfortunately every company has different words/symbols. For example, in one company'...
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169 views

PCB labelling bare part number vs assembled part number

1st time posting question here. I'd like feedback on best practice for labelling PCBs with the board (bare PCB) Part Number (PN) and/or assembled (PCBA) part number. We give bare PCBs a PN, then the ...
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1answer
42 views

What is the transparent border around my Altium trace?

I am routing my first ever PCB and half way through the routing process I've noticed my tracks now have this transparent border around it. Any idea what this is ? I must have clicked something? Not ...
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1answer
22 views

Altium Placing components

I am trying to place components in Altium designer using the Manufacturer part search but the "Place" option is inactive. .
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77 views

Identifying decoupling capacitors in schematics and routing them properly to ICs

I am a chemistry student trying to replicate a 4-layer PCB design from a pre-designed schematic , this is my first PCB project. The design: The stack: Signal/component top layer (jacks,pots,buttons) ...
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1answer
41 views

Footprint to accomodate chips with different pin count

I am working on a PCB that (among other things) accomodates an MCU which is available either in a SOIC-14 or SOIC-16 package. Both packages are pin-compatible, the SOIC-14 is simply shorter to one ...
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1answer
49 views

What to do with the /RST pin?

I'm using this gate driver IC. My question is, do I have to externally pull up the /RST pin? Because it can't be left floating, but I don't get the part that says "pulled down internally". ...
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1answer
131 views

5V to 3.3V what is wrong on my schematic?

I made a schematic based on the SY8089A1AAC(Datasheet) My schematic(I tried with and without C8): I soldered everything but the output is 0V(0.04V to be precise) What is so wrong ? It is part of a ...
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2answers
67 views

Resources on multi-MCU architecture?

I am designing a 6-axis robot arm, and I just finished tuning the control algorithm for a single BLDC using a STM32 MCU. The next step led me to wonder how such system usually works: I don't think my ...
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1answer
32 views

Autodesk EAGLE: PCB layout lost when copying from schematic

On one panel, I'd like to have 4x4 'boards' that are all the same. When I copy the respective 'group' in EAGLE, I am losing the placement of the components with respect to each other in the PCB layout....
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46 views

Randomly Floating PWM signal

I am having trouble with a randomly floating digital signal. Transmission is between a microprocessor and a CPLD unit and is used to run a half bridge. Measurement was taken after the output resistor ...
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3answers
97 views

TTL-based computer/video frequency limit

I was quite impressed by Ben Eater's breadboard computer, and I would like to build something similar, especially with a VGA card like the one he built, but with my own 6845-like text mode generator ...
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1answer
57 views

Resistors on decoupling capacitors in ADC Layout Guidelines

The datasheet for TI's ADS8691 ADC chip has the following diagram in its layout guidelines. I just have a few questions about the resistors in the diagram, which I don't believe are mentioned anywhere ...
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1answer
72 views

PCB Layer Number Standards?

Is there any standard or common numbering system for PCB layer numbers? I'm using Altium. I imported a few different components from a couple of libraries and found that they put things like ...
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1answer
59 views

Need help with low power audio amplifier circuit [closed]

I intend to output an 8-bit waveform generated on an ATtiny1614 microcontroller running at 3.3 V to a 1-2 W, 4-8 ohm speaker and have the user able to change the volume. For that, I am thinking about ...
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2answers
26 views

PCB Trace Width : Common (LINE) Trace for 2 Relays

I am designing a simple switch controlled relay board. On board I have two 5Vdc 10Amp Sugar Cube Relays which will receive 230Vac from Terminal block connector and will be controlled with 5Vdc input ...
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1answer
71 views

Choosing the correct Ground or Power net for internal copper planes in a 4-layered design

I am a chemistry student trying to replicate a PCB circuit as part of an extra-curricular challenge. I am in over my head, but I am learning a lot and don't want to give up. I tried to route the ...

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