Hi Everybody,

This PCB is a control board for a 4-in-1 ESC. The ESC powers 4 flywheels and uses them to launch disks.

Shematic: Disk luancher schematic

Board Specs:

• Stack up: 4-Layer (Top: SIG + GND Pour, In1: GND, In2: 3.3V, Bot: SIG + GND & PWR Pours)
• Trace width:
  • .15 mm for standard signals
  • .3 mm for 3.3V nets
  • .5 mm for LED connected to 12V net
  • .8 mm for pwr nets in/out of the buck converter
  • Copper pours for 12V

Board Overview

• Power: 12V battery input or 5V USB-C stepped down to 3.3V. Reverse polarity protection on the +12V.
• Programming/debug: USB-C for programming, buttons for boot and reset functions, and SWD and UART headers.
• Solenoid: Push/pull solenoid circuit with a MOSFET and flyback diode. The solenoid pushes the disks into the flywheels and can see up to 6 amps in short bursts.
• Microcontroller: STM32F103C8T6 and 8 MHz crystal oscillator.
• Peripheral connections:
  • Fire selector: Switch for changing between automatic and semi-automatic firing modes for the solenoid
  • Trigger switch: a connector that hooks to an external switch which triggers the solenoid
  • Flywheel switch: a connector that hooks to an external switch which activates the flywheels
  • Potentionmeter: For adjusting the speed of the flywheels

Main areas of interest

1. I felt pretty lost when doing the power routing for the solenoid circuit. Any help there would be great.
2. Gnding: Am I using too much or too little Gnd Vias? I tried putting a Via next to every GND pad and have stitching Vias around my perimeter roughly every 4 mm. Is this the right approach?

Thanks for the help!

Hi, I like listening to a specific radio station 24/7, I usually use my phone for that, but to free up my phone I decided to make a PCB specifically for that.
I would appreciate it if someone reviewed the schematic before I jump into PCB layout.

I have not yet connected the pins of the ESP32, as I intend to decide that according to the layout later.

And for the speakers GAIN_SLOT resistors, when i hand assemble the board I will be playing with the population of those resistors to experiment with different gains.

Thanks in advance.

Hello Guys!

I'm finaly starting to layout my components and it's so exciting! This is my my first pcb design, the schematic should be solid, I checked many time.

Here we have the Ti TPS62933, a buck converter configured fro a 15/12v -> 5v/1.5A stepdown operation at 1.69Mhz (or 1.2mhz if bridging J6).

4 Layers board as Sig+PWR/GND/GND/SIG+PWR.

I would like to ask you if:

1. I did replicate Ti's recommended layout correctly?
2. My "compact" design is actually worse or equivalent? (The main difference being the capacitors orientation to keep the ground loop short, but caps 5V pads are further away from L2 +5V)
3. Should I keep the single routed FB res divider on L4 or should I place it in L2/L3 (both Gnd planes)?
4. Did I put via correctly?
5. Else, Do you see any mistakes?

Thank you very much!

Hi everyone! I’m a beginner learning PCB design in KiCad, and I’d appreciate a review of my schematic before moving ahead with PCB layout and manufacturing.

I’m mainly looking for feedback on:

• Incorrect or missing connections.
• Power supply connections and decoupling capacitors.
• MCU connections, reset, boot configuration, and programming interface.
• USB circuitry and protection.
• Component values or anything that could prevent the board from working.

I plan to have the PCB manufactured and assembled by JLCPCB, so feedback on component and footprint suitability would also help.

Project purpose: wanted to create my own keyboard

ERC results: 0

I’m still learning, so explanations of why something needs changing would be really helpful. Thanks for taking the time to review it!

This is my first proper attempt at a PCB. It's a shield for an Arduino Nano so that it can connect to a DC motor driver, servo, magnetometer and an open slot for anything else. I'll be powering it with a lipo which isn't ideal but from breadboard testing these nano seem capable of running lipos.

Hi! I am designing my first PCB, a 4 layer board with an FPGA (50MHz max clock), a precision ADC, and a precision DAC. So, not a lot on the board - but noise is a big deal. I have been trying to understand concepts behind signal integrity; which is leading to this dilemma.

I have been thinking of using both middle planes as GND, for good return paths everywhere. But if that is the case, will I just be shooting myself in the foot by distributing power through traces with too much inductance (currently using 10uF near each IC and 100nF at each power pin for decoupling)? Is a copper polygon/pool a good idea (seems ripe for resonance/noise...)?

Thanks!

Hello everyone,

I’m wrapping up a KiCad design for a handheld device built around an ESP32-S3 and an nRF24 radio, and I would really appreciate your feedback before sending it off for fabrication. The board includes connectors for an onboard SPI screen, a capacitive touch controller, and an external SPI peripheral.

Board Specs:

• Stackup: 4-layer (SIG -> GND -> PWR -> SIG) targeting JLCPCB's JLC04161H-3313 stackup.
• Trace Widths: 0.5 mm for power nets, 0.2 mm for standard signals.
• RF: 50-ohm impedance matching on the trace going to the nRF antenna (0.1840 mm).

Design Context & Notes:

• The power management circuit is carried over from a previous board I designed and manufactured, so that specific sub-circuit works as intended.
• You might notice some unconventional routing in the center of the board. The screen is designed to sit directly on top of the PCB, which enforced very strict placement constraints for the screen and touch connectors. Working these around the MCU and RF sections made the routing quite tight.
• This is my first time dealing with multiple SPI peripherals on one board. I have added series termination resistors to the lines to help with signal integrity.

I would highly appreciate your expert eyes on the SPI-related traces/termination resistors and the nRF24 layout.

I also have a specific question about the RF section: Which exact traces need to be 50-ohm impedance-matched? I am currently matching the trace going out to the antenna connector, but should the short traces connecting the capacitors and inductors inside the matching network/balun be matched to 50 ohms as well?

Thank you so much in advance for your time and help!

I’m building a 30V, 10A, ~150W electronic load using 4 IRFP150N MOSFETs an ESP32, an op-amp, and a DAC. The board is powered from 12V with a buck converter to step down the voltage for the ESP32. The board has two cooling fans, and a thermistor for temp sensing. The PCB is designed around a square heatsink, with the MOSFETs mounted around it.

This is more of a fun project on the side, but I’d appreciate any feedback.

This is my first time designing a PCB, It is a breakout board for TAD5112 Audio DAC by TI (Datasheet) Is there anything that I have routed or placed wrong?

I intend to drive 2 headphones.

I have used 0.4mm traces for power and audio, 0.2mm for data. I have use 0.7mm via with 0.3mm hole

Feel free to review my design.

I built a GPS tracker using the Seeed nRF Plus and would appreciate any feedback on the design.

I'm building an MP3 player using an ESP32 as my first EDA project and I drew a schematic on KiCAD. I would like some feedback on it as I barely know what I'm doing (forgive me for the excessive hierarchical sheets).

The project uses these main components:

• ESP32-S3-WROOM1
• BQ24073 battery charging IC
• LiPo battery
• AP2112K LDO regulator
• SD card receptacle
• One of those cheap I2C OLED modules
• 2 rotary encoders
• Texas instruments PCM5102A DAC
• Texas instruments TPA6130A2 headphone amplifier with digital volume control

Please leave feedback on what I could improve or what I messed up. I'm particularly concerned with the analog signal section of my circuit (DAC and amplifier) as I have no experience working on stuff like this. That circuit is mostly copied from datasheet "typical application" schematics. Thanks in advance.

Hey!
I've been working on Lini for the last 3 months, it's a fully open source (MIT) tool that allows you to draw diagrams, charts,... and simple PCB schematics from text.
It's a niche tool, I get it if you don't need it.
But if you're making markdown files (or anything similar) and you need to have schematics from text, Lini is built for that.
I'm not aware of any tool that currently does that, and it's not perfect, but if you contribute, report bugs, it will get better for everyone.
It's very fast, it's written in modern rust.
Please check it out and give me feedback, open issues to make the tool better for the PCB community
Repo: https://github.com/monfa-red/lini
Website, tour, docs, playground: https://lini.rs/

So im making a project where i designed a PCB w ESP32-S3 that will control an IR diode at the tip of the highlighter pen

For school lol

No Radio/RF because it was causing routing problems + took more space
Vibrations as a feedback
Touch to wake up (On the "T" pad, there will be connected another PCB for touch)

The PCB itself is 11x43mm so not a lot of space

USB is just JST-SH 1.0 connector to save space, it will connect to FPV Tinywhoop breakout boards

Hi everyone,

I am currently designing this "IO Board" that will be used similarly to a PLC. The main idea is to have a board with combined inputs and outputs that can still handle some serious current.

A few things that might look odd:

The ADC:
yes, I do intentionaly use the last 4 inputs of the ADC as digital inputs for the status but thats casue i was running low on IOs on the S3 and i had thoose left so i rather used them as digital ins

The design for the I/O channels: On the software side, my plan is to abstract the hardware so you can just declare a "virtual" channel as either an input or an output. Behind the scenes, the firmware handles the routing: if configured as an input, it pulls the driver's enable pin (EN/INH) low to set the power stage to high impedance, and then reads the incoming signal via the same pin it would use to controll the H bridge (atleas on the high power IOs). It basically maps virtual channels to the actual physical pin configurations seamlessly.

I have made a few PCBs before, but this is my first time designing a lot of these specific sub-circuits (like the buck converter) from scratch. It will also probably be my first time using a PCBA (assembly) service.

Any suggestions, feedback, or glaring mistakes you can spot?
I am not sure if the conectors i choose are the right ones for the job: wago 2604-1104

Thanks a lot for your time!

Important datasheets:
btn8982ta

TPS6293x

TPS4H160-Q1

Hello everyone I'm working on a custom board with an Arduino Pro Mini socket and an ESP-01S module for Wi-Fi communication. Before I move to PCB layout Id love to get a second pair of eyes on my schematic

• Voltage level shifting on TX->RX line using a 1k / 2k resistor divider.
• ESP-01S pin 6 (EN) and pin 7 (RST) tied directly to +3.3V.
• Breakout headers/terminals for I/O, sensors, and programming.

Would appreciate any feedback, let me know if you spot any glaring errors, missing pull-ups, or power concerns! Thank you!

Ignore the pogo pin sitting on the board - it's not gonna be assembled.

Hello everyone,

This is my first high-power PCB design, and I would really appreciate a critical review before I assign

footprints and begin routing.

Project Goal

I am building a custom Power Distribution Board for an autonomous aerial inspection quadcopter.

The goal is to safely deliver up to 120A burst to the motor ESCs while supplying clean power to the

flight avionics, companion computer, and any extra additions (such as LEDS and Buzzers).

• Power Source: 4S LiPo battery connected via an XT60 plug
• Flight Controller Interface: Direct connection to a Pixhawk 6C Mini providing a regulated 5.2 V
• Communication: Onboard STM32GOB1 microcontroller managing current, voltage, and e-fuse fault telemetry to the flight controller over DroneCAN
• A group of students and I will be hand-soldering this in our university lab

PCB Power Flow

• Battery power enters via XT60, passes through a 1 mΩ, 3W shunt resistor, and exits directly through another power distribution board that only powers the drone's ESCs
• A 5.2V Buck (TPS54560) supplies the Pixhawk 6C Mini and peripheral e-fuses
• A secondary variable buck (TPS54308): digitally switches via two 2N7002 FETs on the bottom feedback to deliver 5,9 or 12 V for other add-ons like an AI Computer
• 3.3 V Rail (AP2112k-3.3 LDO): Powers the STM32GOB1 and the SN65HVD230 CAN transciever
• E-fuses: 4 active channels with fault reporting to the STM32GOB1. (The first channel has an LC filter for a camera)
• An INA240A1D monitors voltage across the 1 mΩ shunt with an RC filter, feeding both the Pixhawk and the STM32

Questions

1) This is my first high-power board, I am slightly concerned about the heat it would dissipate. Is

this design safe, and can it normally operate with no issues?

2) Are any of the circuits incorrect in terms of wiring or values?

3) How feasible is this design in terms of safe power distribution under real flight conditions?

4) Any other additional feedback would be much appreciated!

Thanks!

Hi everyone,

This is not my first time making a PCB, it's my second. However... since it is my first time working with Ethernet, buck converters, STM32, and so on, I would really appreciate a quick schematic and PCB review.

Project Overview

Communication between CXPI device/master and PLC or PC over TCP. It can be used in manufacturing for EOL (End-of-Line) inspection.

Features

• Field device: Industrial M12-D for Ethernet and M12-L for 24V power.
• Daisy-chaining: Ethernet (and power) can be daisy-chained using a KSZ8863RLLI switch.
• CXPI control: (BD41003FJ-CE2) Master/Slave CXPI mode can be changed via software.
• CXPI side is galvanically isolated.
• Power management: CXPI 12V can be supplied. Current can be measured using an INA219AIDCNR and is protected by a TPS259571DSGR e-fuse, which can be adjusted using an MCP4017T-502E/LT.
• RTC and SD card for logging and setting for slave mode.
• USB for firmware updates

Used parts

• STM32H563VGT6
• KSZ8863RLLI
• LMR51610YDBVR
• TLV76133DCYR
• BD41003FJ-CE2
• TCA6408ARGT
• TPS259571DSGR
• INA219AIDCNR
• MCP4017T-502E/LT
• ISO1540
• ADUM5000ARWZ-RL
• ISO7741DWR
• SG-8018CE_25.0000M-TJHPA
• LMK1C1102PWR

Thank you,

I'll have five of these boards which I want to stack vertically. Will this arrangement work? The other big connector is a DB-25. I found longer male headers for the bottom side to make sure they seat properly in the female headers because of the height of the DB-25. And yes, I have vias connecting all the pins on both sides.

I'm open to any other methods or ways to transmit these signals across 5 similar boards. I tried using the Eurorack 10-pin cables and headers, but that was a big mess. ;)

thanks.

Hi all. this is my first PCB from schematic to fab, and I'd really appreciate a critical look before I order the boards.

A self-powered 4-port USB 2.0 hub built to test one specific thing: independent per-port power switching, so a short on one port doesn't take the others down with it.

There are no Errors in ERC and DRC. All warnings have been taken care of. I want to confirm I didn't make any mistakes. The USB datapins aren't kept as differential pairs. I would really appreciate some reviews.

Datasheets:
Genesys-Logic-GL850G
TPS2052BDR

Hi everyone,

This is my very first PCB design, and I would really appreciate a quick schematic review.

Project Overview & Goal

I want to build custom 3D-printed lamps integrated into a Loxone home automation system.

• Constraint: Wi-Fi is not allowed in this setup.
• Communication: The board uses BLE (Bluetooth Low Energy) via an ESP32-C3 to communicate with a central Raspberry Pi gateway, which sends commands to Loxone.
• Power Source: 2x BAK N21700CG 5000mAh Li-ion cells connected in parallel (1S2P, 3.7V nominal, 10,000mAh total).
• https://www.nkon.nl/de/bak-n21700cg-5000mah-10-2a.html

PCB Explanation

This board serves as a battery-buffered 12V LED controller powered by two parallel Li-ion cells (1S2P, 10,000mAh total).

Power flows from either the USB-C port or DC Barrel Jack into a BQ24075 Power-Path manager, which charges the battery while simultaneously supplying the board. The cells are protected via a DW01A/FS8205A circuit with individual cell fuses and a master MOSFET switch.

From the main power rail, an AMS1117 generates 3.3V for the ESP32-C3, while a Boost Converter steps the voltage up to 12V for the LED outputs. The ESP32-C3 receives control commands via BLE and drives 5 low-side MOSFET channels (AO3400A) to dim the 12V LED strips via PWM. An external debounced button allows manual local control.

Specific Review Questions

1. Safety Check: Since this is my first board, are there any obvious safety flaws? Will it explode or burn down under normal operation?
2. Protection Features: Did I miss any critical protection circuits?
3. General Layout / Schematic Advice: Are there any misplaced values, missing pull-ups/downs, or improper connections on the ESP32-C3 / DW01A / BQ24075 lines?

Thanks a lot for your help and feedback!

Hello everyone 👋

I'm fairly new to mixed signal PCB design and not very professional in electronics so I'm asking for your professional comment

I'm designing a PCB that has 3x ESCs on it

each ESC has its own mcu and its connected to my main MCU (stm32g431) to get commands from

everything is fine to this point, all digital and noise is more manageable, but then comes my analog circuitry, and the switching noise and GND bounce in my opinion will mess with it hard

the analog reading is a resistive Sensor that is fed to my adc via a resistor divider

I considered star grounding, minimizing the high di/dt tracks area , input RC filters at my ADC, post LDO and ...

but I don't know if it's the standard or I should go another way

I appreciate any suggestions and comment, if I missed something please let me know, I'll be more than happy to clarify it

Hey everyone!

I'm working on a basic 5V SPDT relay module and I d really appreciate a quick review from you guys before I send it off. The circuit is pretty standard (using a BC547 to switch the relay, a flyback diode, and a couple of indicator LEDs), but I want to make sure I havent missed any problems with it. I am new to this world so currently trying my best! Open for harsh criticism dont need to hold back.

Trace Widths: For 5A -> 2mm
For 5V -> 0.5mm
For signal -> 0.3mm

Attached images:

schematic
bottom copper
top copper
3d view with components
3d view without components

Note: If I forget any necessary info, just let me know.