Reddit:Electronics

WARNING! High voltage AC and DC on hot side of this circuit. Do NOT attempt to build any SMPS if you are a beginner. You need at least simple LCR meter and high-voltage oscilloscope probe for tuning. Caution is advised!

One of two higher power supplies that I need for my projects, this one is largest made by me. Transformer is a custom made also at home. Circuit and transformer design schematics in gallery.

Introducing Open-Schematics: largest public hardware schematic dataset, paired with images.

WIP screenshots for some RP2040 based cyberpunk sunglasses I've been working on this year.

Hopefully someone will one day create a kicad or easyeda extension that allows me to route at 30° / 60° angles, so I can make hexagonal traces

Third image is the first version. First and second images are improved based on feedback from my dad that has a lot more experience with electronics than me XD

This was possibly the most fun school project I have worked on, even if it was slightly more programming than wiring it all up

One of 4 Automated PCBA test fixtures I have just completed, entire design is from scratch and pretty much everything you see is 3D printed or Laser Cut!

I have 2x PCBAs inside, lots of wires and an additional switching PSU with Dummy load to simulate a battery for the UUT!

Hello, this is a radiophone project I'm working on while in my second year of ECE.

I came up with this new design this time on 4 layers as impedances are really smaller.

First part of the circuit (bottom left) is an LC that will tune close to 1Mhz using an old-school variable capacitor. On next the signal gets demodulated, amplified, given power and outputted (bottom middle) and the rest is a simple power rectifier, with an IC for a cool volume bar using LEDs

Pics are in order of layers, I used GND/SIGNAL - GND - POWER / SIGNAL - GND, and keepout zone below the transformer in order to remove capacitive noise.

Schematics

Layer 1 gnd/signal

Layer 2 GND

Layer 3 power/signal

Layer 4 gnd

This is a small laser module built utilizing a laser diode recovered from a DVD burner. The power supply is based on a ST Microelectronics LM317T adjustable voltage regulator set up in a constant current configuration.

Picture 3 is the output next to a ~5mw laser pointer output. don't think my phone camera liked taking this picture.

Schematic included.

Why the F did they decide to. No, no lissen, we need 36 different pinouts on the same ic with no id code on it either making it impossible to know wich "style" ic you got. Now that's what we need. Looking for help to identify GDS on the nmos somehow cuircit or instrument no problem.

I recently assembled a rosco_m68k tht kit version. Took around 4 hours, tried to keep everything as clean and careful as possible.

Ironically, I’m also working on my own soldering-related project called SolderDemon, so this failure was a good reminder that even clean work can hide stupid problems.

After powering it on, the board wouldn’t boot. Only the START and RESET LEDs were on. Measuring the CPU RESET pin showed ~2V, which made no sense.

First suspect was the RESET button, I desoldered it completely. No change.

While reflashing the PLD, I finally noticed the real issue: one of the IC sockets had a bad pin. The chip looked seated properly, but that pin wasn’t making contact at all.

I fixed the contact temporarily just to test it and the system booted immediately.

Lesson learned: don’t just inspect solder joints. Check IC socket pins too.
Even when the board looks clean, a single bad contact can make a system look completely dead.

Pain, Patience, and Persistence