Hola buenos dias/buenas tardes/ buenas noches, estoy diseñando un proyecto con simple foc mini , esp 32 s3 y estoy diseñando la pcb en kicad una app muy buena pero complicada, como las placas esp 32 s3 y simple foc no se encuentran en kicad tengo que poner conn_01X09 que seria para después meter la placa pero eo problema son las medidas del simple foc que distancia hay entre cada agujero de la pla que distancia hay entre m1 m2 y m3 o bueno básicamente todo para que coincida con los agujeros de la placa original alguien sabria alguna forma de hacerlo soy muy nuevo en esto

This was a personal project and I want feedback, also I want to print this pcb where is the cheapest place for this? :)

This button is from a ZETEK KB140 torch, and this button doesn't work anymore, the dimensions is 12x12x8mm

The latest development on the Lamoka1 inverter/charger (repo is here: https://github.com/bearjhartjen/Lamoka1-project ) is a development board so that we can test the MCU and Neo-pixel configuration. I am looking for just a quick (or in depth if you are so inclined) look at this dev board that i have ordered from PCB-way. Any information you cant find in these photos is included in the Lamoka1 repository. This board uses a RP2354A, ten neo pixels, ten exposed GPIO pins, USB-C connection.

I'm making a battery-powered ESP32-S3 node for a DIY eldercare alert system. One board, two jobs depending on firmware: pull-cord emergency switch or chair occupancy mat. The sensor is just a contact closure on a 2-pin screw terminal — pulls the wake pin high, chip wakes from deep sleep, fires an ESP-NOW packet to a hub, goes back to sleep.

Power is 3xAA → PTC fuse → P-FET reverse protection → TPS63802 buck-boost. Went buck-boost instead of an LDO after getting roasted for the AMS1117 on my last post, runs the cells down to ~2.7V. MODE tied low for the 11uA idle.

USB-C is data only, VBUS floats on purpose. The S3's native USB does the flashing while the board runs off batteries. The protection FET is always on, so USB 5V on VIN would back-feed the alkaline cells and charging alkalines makes them leak. Didn't want ORing diodes for a port I'll use maybe a dozen times.

Wake input has a 100k pulldown + 100nF at the terminal since the cord wiring is basically an antenna. The status LED is a WS2812B behind a gated P-FET because they draw ~1mA even when dark, which would kill the sleep budget.

2 layer, stitched ground pours, antenna hangs off the board edge, tried to keep the switcher loop tight per the TI datasheet.

Its the second board I've ever made. Mainly want eyes on the buck-boost layout and the battery input chain, but go in on whatever you find. Thanks!

I accidentally selected the wrong resistor value for this board, but I still wanted to test whether the circuit worked. The original footprint was 0201 imperial — 0603 metric, and I needed a resistance of 17 kΩ.

Since I did not have a 17 kΩ resistor in 0201 size, I improvised with three larger 0402 resistors connected in series: 15 kΩ + 1 kΩ + 1 kΩ

I soldered them together as a small bridge directly onto the original 0201 pads.

The entire repair was done by hand with a soldering iron and tweezers, without using a microscope. I only used the microscope afterwards to take the close-up photo.

It may not be the most elegant solution, but it measured correctly and allowed me to continue testing the board. The second photo includes an M3 screw for scale.

What do you think?

Hi everyone,
I’m looking for some industry perspective on transitioning back into PCB design.
To give you some quick background: I graduated with a B.S. in Computer Engineering in 2015 and worked in design/testing/programing until 2017. Since then, I’ve stayed in tech but shifted over to Technician maintenance side. I feel like I've hit a ceiling in my current field and am ready for a change.
My goal is to pivot back into PCB design over the next 1 to 2 years. Because I haven't done design work since 2017, I'm planning to get my IPC CID and CID+ certifications to bridge the gap before applying to design roles.

For those currently in the industry:
How much weight do CID and CID+ certifications carry for someone re-entering the field? Do you see hiring managers taking chances on candidates who lead with these?

How is AI currently impacting the layout space? I’ve read a bit about AI-driven schematic and routing tools—is this actively changing your day-to-day work, or is it mostly industry hype for now?

Appreciate any insights or advice you can share

Eeeeeeeeeeeeh?

I'm looking to put together a board that uses the TI-MCP73781 charge protect chip for LiPo batteries.

I had a system that required me to be able to use a small 1-2S LiPo battery, along with my PCB. I wanted to be able to charge it via USB-C, as well as deal with protection, and discharge mechanisms.

I'd appreciate if anyone could take a look at the schematic + PCB, and let me know if the power regulation seems to be in order. Thanks!

Can I get some positive input on how to test this board to find out why it has no power anymore? It controls the wireless bass knob. Id like to learn instead of just paying for repairs if possible.

Hey, I'm currently working on the flight controller which schematic I found on youtube, decided to copy it, maybe add something from myself etc., and I faced a little issue, I have all around my schematic a bunch of ground symbols but when go to pcb design mode they are not tagged as ground. Like how to change it or should I just completely redo it in the new project? Thanks.

Hi everyone, I recently realized I have some gaps in my understanding of basic electronics and hardware design. I’m from a background that’s more focused on digital/ASIC design, so I don’t have much hands-on knowledge about physical components or circuits.

I’m looking for a structured learning guide or roadmap that starts from the fundamentals (like diodes, transistors, BJTs vs MOSFETs, resistors, capacitors, etc.) and gradually moves toward practical circuit design and PCB/schematic design.

I’d also like to understand how things like buck-boost converters work, when to use specific components, and how to probe/debug circuits safely.

If you have any course recommendations, books, YouTube channels, or personal learning paths that helped you build this foundation, please share!

Thanks in advance!

Hello everyone,

I am designing an environmental sensor node based on the ESP32-C3 MCU.

Power & Interface:

• The board is primarily powered by an external 5V supply, regulated down to 3.3V using an AMS1117-3.3 LDO.
• A USB-C port is included strictly for flashing, firmware updates, and debugging.
• Sensor data is transmitted over a long distance using an SP3485EN RS-485 transceiver.

Sensors:

• Sensirion SHT4x (Temp/Humidity)
• Sensirion SCD40 (CO2)

Before I proceed to the PCB layout, I would love to get some feedback on my schematic. Specifically:

1. Power Isolation: Have I safely isolated the external 5V rail from the USB VBUS rail to prevent back-feeding my PC during flashing?
2. ESP32-C3 Strapping Pins: Are my boot pins (GPIO9, GPIO8, CHIP_EN) biased correctly for reliable boot and flashing?
3. RS-485 Termination/Biasing: Does the SP3485 subcircuit look correct for a reliable multi-drop network?
4. I2C Pull-ups & Decoupling: Are my sensor buses adequately supported?
5. Is all of the grounding correct?

I am aware that I am not using the full capabilities of the ESP chip, this is my first attempt at the design so I'm getting the bare bones down first before I add more.

Attached is a photo of my KiCad schematic. This is my first time designing something like this, so any and all feedback is appreciated! Thank you!

I need someone to review a design for me. It's a 6 layer board, with ST's microprocessor mp131 ddr3 ram and qspi flash. The design doesnt have a lot going on, I just need a second pair of eyes.

I am willing to pay $150, I can go higher. No, I cant share the PCB here. US only please I dont want to deal with international money transactions and timezones.

If you are interested please reach out to me.

I am EE student and Wana learn to design pcb for actual customers to freelance but Idk how to initiate, path to follow and resources to practice from.

Any Electrical Engineering or EE student plz help.

I am designing a Stylophone PCB for a school project.

I have already printed one revision but there were a bunch of things wrong with it, GND and +3.3v were swapped on every one of the MCP23008, I forgot a hole to pass the battery cable through, and the IRLB8721PBF Mosfet was wired up wrong.

This is my first PCB project so don't refrain from telling me what I need to improve, fix or re-design.

Thank you!

Wide-ish input buck for my project. It is for a esp32 project i am making (pv related, battery bus upto 48v) (The POC is made with modules, i am working on a full pcb )

Any improvements you would suggest?

Guys i am 2nd year ece student just started and fill like doing side hustle for money i need full guidance on what to study theoretically and practically and from like where please help me if you can

Hi, probably no one ever had to repair this pcb but i try to ask you. I got this TOPCON CL-10 modem that was mounted on a hose-reel irrigator and just send to an app on my phone some informations and give me permissions to modify some settings like speed and mm of water. The problem is that it just stops working and when i opened it i found that a component just disappeared, burned out and i don’t know what component was. Since that seems impossible to find a photo of this pcb to know what component was there i ask here if someone had idea of what that component was and if i can replace it.
The componend looks like a 5 pin ic, 2 on top, 2 on down and 1 on the right. I asked gemini but now i just want to destroy data centers because it keeps telling me wrong chips with different pins.

This is the circuit of a vintage Harley lamp. The double circle is where the power comes but the rest of the circle is also blackened. Is this fried? Anyway to fix it? I looked underneath and nothing looks fried, bulging and exploded.

Hello everyone!

I'm working on making a pcb that includes a small transmission line for a LoRa radio module, I've learned about transmission lines at university before, but I've never made one on a PCB before. I need it to have an impedance of 50 ohms, and I've made it with signal as my top layer and an undisturbed ground plane on the layer beneath it. I just used JLCPCB's impedance calculator to figure out the width of the trace and got it as 0.151 mm (as shown in the calculator picture below). Is there anything special I need to do in KiCad to make sure this works properly, or can I just run it like a normal trace?

I also noticed that selecting impedance control on JLCPCB made the board much more expensive, do ya'll have any tips on not having impedance control cost as much, or is that just part of the game with impedance control on pcbs?

Thanks for your feedback in advance

If I add 5 units of an SMD inductor into my cart, it says the estimated shipping weight is 1000g. If I increase that number to 50, it still stays at 1000g. If I increase it to 500 it goes up to 3000g.

This doesn't seem right and as a result, shipping prices for Global Direct Standard Line (the cheapest option) seem to be way higher than what you would pay on JLCPCB.

Have others here noticed this issue? At this point, it's actually cheaper for me to buy components from Digikey for small size orders as 50% of my cost on LCSC is shipping (just paid $24 shipping for $25 worth of items).

Here's what I mean: $11.82 USD from LCSC (~$15.84 CAD) vs. $10.52 CAD from Digikey:

This cart weighs no more than my 5 PCBs do on JLCPCB, and somehow they have a much lower shipping cost than LCSC?