Reddit:Electronics

Opened up this active speaker with a failed SMPS, and found this absolute shit show. Precious repair tech was too lazy to remove the board from the frame and just botched a cap to the remnants of the previous, presumably exploded cap. FML, I'm checking this board extra carefully now.

Got my first PCB delivered from JLCPCB

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.