Reddit:Electronics

Hey everyone!

I’ve been tinkering away on a little evening project for a while now and wanted to share it here. The Quansheng UV-K5 handheld radio is fun to hack on, but its original MCU only had 64 kB of flash memory. Not enough to run all the cool community-made features at once.

So, I designed a tiny flex PCB “implant” that lets me replace the stock chip with an STM32G0C1CET (512 kB flash, 144 kB RAM). It involved a lot of signal remapping, flex board experiments, and of course plenty of solder fumes....but in the end it worked!

Pulled apart an old valve amp and was struck by how good the color-coded caps and resistors looked. Modern SMD boards just feel boring in comparison. Anyone else miss this aesthetic?

Only two components, a esp32 board & 0.96 inch oled screen, blue is the 0.96 inch oled screen & black is the esp32 with USB-C

I was playing with 12v LED cob panels and wanted to drive them from a esp32 on breadboard. So i made this, with 6 2N7000 mosfets and the associated resistors. I was quite pleased with my happy notion of alternating the orientation of the transitors alternately so the sources were all in a line, this also made the drains form neat pairs. which was nice.

Hello everyone, Chris here. I built a simple TCI ignition module, and it works— but I haven’t tested it yet on a motorcycle or anything else. My friend said he had done this before on a classic car and it worked. I’ve uploaded a full tutorial video with the circuit and parts on YouTube. You can check it out and let me know what you think— I’ll put the link in the comments.

I want to make my own PCBs, but i find all the PCB design programs infuriating. So i have been honing my free hand skills, using blank copper clad board and an etch resistant pen. This, a simple 555 flasher, is my latest one. I used a SOIC 555 with 0805, and 0603 surface mount supporting components.

I am doing a diagnosis on some Hyundai Santa Fe D4HD. Injectors keep dying electronically every couple of minutes. Thought I might share this if anybody ever needs it...

Saves me having to always read for scissors or a bulky tape dispenser taking up valuable desk space. I had ordered one online and picked up a few more on my recent holiday to Japan.

My 12S BMS (BQ76952) works and I can turn on the fets via I2C.

Unfortunately I accidentally used a 6.3V tantalum on the 12V buck output which caused this catastrophic failure.

Just finished the major components of my workbench. Me and my girlfriend build the desk from scratch and i put my electronics in the room. Still got some tidying up to do and run power to the 3d-printer and lab bench power supply to the far left

I missed to route two traces from a Raspberry Pi Compute Module socket (my acrrier board) and had to rework. The pad has a width of 0.2mm (.0080"), so I got extra a new tip for that (Weller LT 1LX). After two attempts I could successfully tack the bodgewire to the unconnected pads.

[Not mine]

Quite an interesting failure - not something I've seen before.

For those interested, this is inside a PA amplifier, which surprisingly does still function, although this may be for the untested channel. PAT sticker from 2005 so at least 20 years old.

Hello everyone. This is the PCB I came up with. Its to simplify the setup of certain hardware laboratories controllers that I also came up with previously. Took me couple of days (around 4-5 hrs) of work to solder them all 40 boards. But this will make super easy to connect things, or replace the microcontroller in case of a failure.

As my very first design (this is slightly revamped to add small "window" to see the status LED's on nucleo board), I once again, feel really proud, haha.

The revamp also added another 6 blank pins for future expansion (there are plans to add dynamixel robot arms to controllable devices repertoire).

Wanted to change the current limiting resistor on this DRV8871 motor driver board. Didn't want to wait for the correct component to used a through-hole resistor on 0603 pads.

I love seeing boards that have hidden messages or pictures on them