Reddit:Electronics

Hi everyone,

This is my Healthtracker project. This will be my first real 6-Layer PCB I have designed using EasyEDA.

I am using the nrf5340 for this low Power Bluetooth application paired with couple i2c peripherals for activitiy, heartrate, time & temp. So I don't run out of storage, I integrated infineon 8-Mbit FRAM.

Power is supplied to various DC/DC Buck/Boost converters found at the top.
Charging is possible via USB C.

I am planning to programm the SoC using the pinheaders and my DevKit. (pinheaders will be soldered out, after programming and Debugging).

Oh, don't be confused with these many throughhole vias; JLCPCB curently doesn't support blind or buried vias....

Have a great day.

I couldn't for the life of me understand why the multimeter was not reading correctly when using bananas to crocodile cables. Lesson learned: don't cheap out on cables.

PONG has always fascinated me. A video game made entirely from logic blocks from the 74xx series. Without a processor, memory or software.

After seeing an original PONG console at the Berlin Computer Game Museum, I set myself the goal of recreating one. And now it's finished.

I didn't want to use the large arcade cabinet like the original as the ‘housing’, but something smaller that would focus on the circuit board. Because it is the ‘star’ of PONG. Ingeniously designed by Allen Alcorn, who went down in computer gaming history as the designer of PONG. But as I said, it's not a computer.

I redesigned the circuit board from photos and templates. Conductor track by conductor track, component by component. The ICs are still relatively easy to obtain (I also recreated an Apple I, which was more difficult, or rather almost impossible nowadays).

The control panel also had to be the same as the original, and of course a real coin validator had to be included.

This “Mona Lisa” was created as a technical demonstration by a by a Japanese company that provides PCB assembly (PCBA) services.

Instead of using PCB traces or silkscreen artwork, this piece is built from about 10,000 1608-metric SMD components. The image is formed through the color variation of resistors, ceramic capacitors and other components, turning electronic parts into a high-resolution mosaic.

This post presents a component-level schematic overview of an ESP32-S3-based

vision development board.

The shared material focuses strictly on electronic circuit design and

interconnection of active components, including the MCU core, power regulation,

and peripheral interfaces.

Primary active components shown in the schematic:

- ESP32-S3-WROOM system-on-chip

- DVP camera interface connected directly to the MCU

- 6-axis IMU interfaced over I2C

- MEMS microphone connected via I2S

- SPI-based microSD card interface

- Dedicated voltage regulation stages supplying RF, camera, and sensor domains

The circuit design integrates vision, motion sensing, and wireless communication

on a single ESP32-S3 platform. Power integrity, signal routing density, and pin

multiplexing constraints are central factors influencing the schematic structure.

The schematic is provided for component-level reference and electronic circuit

visibility.

Since it's newly created, it doesn't have a GitHub repository yet.

I love maps, transit, and DIY electronics- here is my recent project combining all three!

I had an 8"x10" PCB manufactured with a custom map of Boston silkscreened on the front side. On this map, each station on the Red Line is marked by two LEDs- one for inbound and outbound trains. Data is streamed from the MBTA's API and displayed on the board, showing location, speed, or occupancy information.

This version utilizes WS2812B-2020 LEDs and a very simple two-layer PCB. For future projects, I would be interested in using rear-mounted LEDs (such as SK6812-Es) for a more polished look.

If you're interested in the project, all of the code, PCB files, and tutorials are open source: https://github.com/tomunderwood99/CharlieBoard

S21Pro, successful rework and trace repair. AMA!

( Ps: Sorry about the double post; I wanted to be more detailed than my prior post because this community is more receptive than the soldering subreddit. Also, I am fully self taught on everything here, so pardon my ignorances on some terminology. Not IPC certified either. — — — )

The goal of this repair is to achieve a successful count of all 65x asics on this PCB. Image 2 shows a fail on full count. Image 12 shows a successful fix.

Image 1, shows my main circuit with issues, conformal coating still present. Arrows and circles identifying components I eventually replaced, or repaired. Darker spots on the conformal coating indicates that these circuits overheated and likely shorted out.

Image 2, shows the entire single layered PCB, plus includes the readout from my ASIC tester (it’s called a Stasic.). Started removing conformal coat.

Image 3, closeup of problem circuit with conformal coating removed. Burnt diode from my boost circuit and clear signs of shorts throughout several dependent circuits.

Image 4, propane blowtorch used to reflow the first half of my boost circuit. ( I imagine this photo is what will cause some concern. This is a method I’ve used thousands of times at this point. While it works, it is not my sole methodology for reflow. Also, I offer warranty on my repairs. )

Image 5, closeup of first ASIC removed. My two main vdd signals would not pass this chip. Removal helped identify those corroded pads, and prompted me to remove, and check other asics in the physical area.

Images 6 and 7, closeup of the previously corroded pads on the asic chip; cleaned and ready for tin. Next was the hard part.

Image 8, closeup tinned asic. Passed continuity test, despite the ugly-lumpy pads.

Image 9 and 10, closeup of the original pads where my first corroded asic was removed; and closeup of it after being tinned.

Image 11, previously corroded PCB and ASIC chip repaired, and successfully placed. (( Just throwing it out there that I placed this asic with the blowtorch lol. ))

Images 12, 13, and 14 (12 & 14 unlabeled), closeup of the entire area fixed. Another angle of the chip placed (that bridge is intentional; bypassing a 1k resistor), and the reveal that the entire back-half of this board is solid aluminum.

my test bench is combined with music production, for no reason other than convenience.

Argh. I'm just here to complain. Circuits West in Longmont Colorado closed their doors on Monday. I realize the responses I'll get are "Use JLC or PCB Way" and yes, those are great options, but I do quick-turn (usually 2-day) fabs and on top of that it's CNY. Argh. Just annoying. Can't do anything about it. Guess it's Advanced Circuits (APCT, AdvancedPCB) as a single-source in-Colorado fab shop :(

I don't have an image; I'm posting their logo.

Hi hi :3

Upfront - with a huge help from SlimeVR devs and community I was able to make a final version of my SlimeVR smolBrain trackers. So thanks a lot for the help to them <3

Why share here you may ask? It looks like there are a lot of supa smart people who may give feedback on whatever I made, especially for low power devices. That was the first time for me working with low power devices and since I'm not exactly the best hardware engineer I had to learn a lot. Leakage here, sleep mode there, Iq currents for every device on the board and so on. Was pretty fun. But also - I tried to add to the schematic and readme a ton of measurements of the board and reasons why I used components or what they do. Very often it is something I really want to have on other people's works, like dev notes, and it is not always there. So I decided to make it myself :3

Is description and notes good or not I do not know, there is a chance I still have some problematic parts or inconsistencies, but I tried to make this board as small and as good as I can, following all PCB routing rules. So I believe if you have never done something like this it can be a very interesting insight or an overview on behaviour of almost all components on the ready to use board.

What you will find inside:
- schematic with ton of notes, almost for any component
- real measurements for current consumption in normal and deep sleep modes (using Nordic Power Profiler Kit 2)
- power efficiency measurements
- analysis of power supply voltage ripples after DCDC and LDO
- IMU performance using raw data for ICM-45686 verify does it match datasheet values or not
- some basic knowledge for routing. I know, it is not all, I know for small devices like this it does not matter sometimes, but as I said I was trying to keep an eye on stack, where and how I route
- information on DC-DC behaviour at 100% mode which causes 500 uA spikes of current out of nowhere... I mean I did not know, I do now :3
- transition times for active divider and why to use it if you have current leak anyway

It is open source as usual :3, feel free to check out my git project page if you feel like it.

I love old capacitors, colour shining happiness \m/

Howdy, first time poster here. I’m a professional ASIC repairman; love my work and just like showing it off sometimes. Trace repairs are my favorite

This is only a small part of a much larger repair (The full post got zero attention anyways lol) but feel free to ama. All the surrounding smds are 0201 sizing.

whole washing machine program that includes: motor, water level sensor, water flow sensor, 3 valves for water intake, float switch if water is leaking under machine, pump, heater, temperature sensor, door lock, led light inside drum, and front pcb that uses one wire uart

I’m really excited to try some circuits and build a decimal to binary/hexadecimal game. I’m in school for automation and robots, smart manufacturing and industrial technology, so I have a base knowledge of how circuits work. I’ve never used a breadboard, we mostly wire up components to make a complete circuit, more so electrician work. I also got a solder iron recently. I’m really excited and wanted to share. I’ll definitely be back to show the finished project. The breadboard is smaller but I’m sure it’s enough for a beginner. For the most part, I know what the included parts are for. I am excited to get into this!

Custom PCB designed around STM32F405RGT6 for rocket / drone applications.

MCU

• STM32F405RGT6

Interfaces & IO

• ADC input for battery voltage measurement
• 4× PWM outputs
• 1× UART for radio
• 1× UART for GPS
• 1× SPI for IMU
• SWD interface
• USB interface

Notes

• Custom-designed PCB
• Hardware only
• All Fab Files included (Gerber/BOM/CPL/Schematic/PCB layout/PCB routing/and all settings)