Questions tagged [pcb]
PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.
6,739 questions
2 votes
1 answer
205 views
What is the correct way to deal with circular PCB ground planes
Let's say I have a 2 later circular PCB with some components on it. Nothing high speed. I want to have ground plane on it with proper stitching. In proposition A, there is a continuous ground plane on ...
0 votes
0 answers
86 views
PCB check: individually addressable LED strobe
I’m working on a circuit board for amber strobe units to be used in a car. Each board will feature eight individually addressable LEDs, controlled by an ATtiny microcontroller. In certain ...
1 vote
0 answers
54 views
SMA Edge Mount Connector Placement
I would like to measure the input/output impedance of some circuits from 1 MHz-200 MHz using a nanoVNA. PCB stackup is Sig/GND/GND/+5V, Sig does not have a ground pour on the same layer. Trace width ...
- 883
-1 votes
0 answers
42 views
Un-Routed Net Constraint in Altium for a GND pad that's already assigned
Hello, I'm working on fixing things Altium has highlighted in the DRC I ran on my PCB, and I can't figure out why I'm getting a Un-Routed Net Constraint error here. I believe C7's GND pad is already ...
- 9
-2 votes
0 answers
53 views
4-layer PCB design review (revised board v1.0.4)
I have made alot of progress updates on my flight computer since I last made a post. I have a few questions now after completing my most recent version of the board, but first I will share with you ...
-1 votes
2 answers
196 views
Need a professional to take a quick look at my Electroencephalography (EEG) PCB design
EEG PCB. 4 layers, signal, ground ground, signal. No cuts in ground planes. Very sensitive analog. Please let me know if you notice anything drastically wrong with my design. I got it as good as I ...
- 33
0 votes
1 answer
41 views
Will plugging in a 4S LiPo cause damaging voltage spikes on my ESC power stage, and how can I protect against them?
I'm designing an ESC that includes a buck converter (16.8 V down to 3.3 V) and an LDO (16.8 V down to 12 V). The ESC receives its 16.8 V input from a 4S LiPo battery, but the battery is first ...
- 489
1 vote
1 answer
71 views
Choice of PCB Material for HF RF circuit
I am currently designing an FM Radio (88MHz - 108MHz) and have gotten to a point in the design where I am beginning the layout plan / make some general design decisions about manufacturing. I plan to ...
- 27
0 votes
0 answers
45 views
How to correctly merge PD Power and USB Data from two separate USB-C inputs? [closed]
I am an electronics engineering student working on a project. I've run into a design challenge with USB-C power and data. My Goal I have a Main Board that contains an MCU and a PD Controller (Sink). ...
2 votes
0 answers
86 views
Wrong Voltage Output Buck
I have a problem with this circuit on a PCB I just made. The output is designed at 3.3 V. But, I have a reading of 6 V on the output and a reading of 1.1 V on the FB pin (0.6 normally). This is with a ...
0 votes
0 answers
42 views
Li-ion charging + rails on small PCB (TP5100, XL4015, 2S BMS) — safest path without PCB rework?
I’m working on a piece of portable audio electronics and I’m running into some charging and power supply issues. Project: • Small 3-board build: power, signal (5 V), amp (needs ~9 V). • Battery: 2 ...
0 votes
0 answers
29 views
Can I use simple resistor dividers and ADC inputs for back-EMF sensing in a drone ESC?
I'm designing my own ESC for a simple quadcopter drone. The ESC is powered directly from a 4S LiPo battery, and I'm now working on the back-EMF voltage sensing needed for sensorless commutation. The ...
- 489
0 votes
1 answer
75 views
ESP32 to ATtiny85 communication on large grid PCB
I want to have a grid of faders/sensors/LEDs/buttons (with ATtiny85s) that I can move around, and that all talk to an ESP that sends data over the network. The idea is to have a PCB with traces for 4 ...
0 votes
0 answers
44 views
How can I match the Marki Microwave online filter calculator results with my ADS simulation results? [closed]
I designed a 5th order Chebyshev interdigital bandpass filter using the Marki Microwave online filter calculator. Frequency range: 1.9 GHz to 2.1 GHz Substrate: εr = 2.2, height = 20 mil (0.508 mm), ...
- 11
0 votes
1 answer
95 views
USB 2.0 Enumeration only using datalines
I currently have a device which is powered through a 5V battery and pulls up to 1A. The device only exposes D+ and D- data lines. The device will often be powered on by the battery before a USB is ...
- 1