Reddit:Electronics

So I got this thing chirping but I think the little battery powered amp/speaker I’m using is faulty. Super fun though if you have a busted Commodore 64.

the one on the left is the switched-mode power supply its much smaller and lighter, this one can output twice as much current as the linear power supply on the right

Made by a high school robotics team in MN

Good news for Keithley 2000 / 2015 / 2016 / 2010 DMM owners with dim displays.
This is a drop-in LED display conversion kit that replaces the original dim VFD.

So this is my power supply i have built. A dual rail ±37V 1-1.5A Linear power supply using lm317 and lm337 so far untill it have built a series pass voltage and current regulator for it just to get it started. Also going to add 0.33 ohm resistor between the 15000uF and 10000uF capacitors. My noise levels are low i think as can be seen in picture 1. I have a soft starter, emi filter on the AC side before transformer, filterd rectifier using small rc filters on each diode, 20d20 ntc, 15000uF, 10000uF. 5630uF +, capacitance multiplier, emi dc filter, another dc filter. Regulator, out.

I always wanted to create my very own weather station which is capable of measuring as much things as possible. For a start decided to create a set of sensors for temperature, pressure, humidity, and light. There are plenty of options for these, but I chose digital sensors with I2C interface. It leaves analog part to sensor vendors and allows to use them through a common interface both from hardware and software levels. Check out linked project page. It contains schematic, PCB design, simple test code for RPi Zero 2 W, and a tool to visualize measurements. The set requires 1.8-3.3V (haven’t tested 1.8V yet), I2C connection, and provides a couple interrupt lines. I have a bunch of MCUs so now planning to create more code examples - for RPi Pico, ESP, STM.

thought it looked coo

This is more of a vent I guess. So maybe it’s because my workbench is in such disarray; my home office is trashed so I started doing work in the downstairs dining room and fucked that place up, too. Wreaking havoc around the house and the other half isn’t having it lol

I’m trying to work on this board and wasn’t thinking about serviceability. Only after everything was done, I was like, “oh shit this thing better work”. Got everything wired up and proper, did point to point verification with a multimeter and resolved shorts on the 5v bus and come to find out, when powered on, the ESP32 is not working as expected. Everything is point to point soldered. So I need to rebuild this stupid thing from scratch, but the proper way using wire wrap techniques and socketing the ESP32 and logic level converter boards.

Just FYI, this board I’m trying to build is meant to drive a HUB75 RGB panel with text/graphics from a Raspberry Pi’s UART interface. Prototype wise, it’s working as you can see in the background, now I’m trying to put everything on this perfboard as it is mean to be displayed in the open. The ESP32 is also driving 8 x MAX7219 8x8 LED matrix. This is an effort to build a thing centered around AI/LLM. My idea/concept got everyone in the AI community in an uproar, so I’m making an art piece out of it