Reddit:Electronics

I wanted to take my first step into usb hubs and a few weeks ago i noticed the usb 2.0 signal on the m.2 slot. So I came up with the idea to make a usb hub from an m.2 card and this is the result. The board has a 3.3V to 5V boost converter, a 2 port usb hub and per port current limiting. each downstream port can deliver 500mA. this was due to the power limit for the m.2 slot. I ordered the boards and the components and I will build it in the next few weeks. If you want more detail on it check out my github.

Microscopic image with $11 usb microscope

Nabbed a huge lot of parts at an estate auction. some fun transformers in there. gonna use some for my ghostbusters cosplay build.

Still got lots of tubes to sort out

Found this interesting bit of kit at a thrift store. It's an 80s electronic bathroom scale. Measures weight by moving a piece of steel, wrapped in aluminum through a big inductor. Like a reverse solenoid. That then goes into a board with a TL081 and a CD4050 to generate an 11.68KHz square wave at rest (display reading 0.0lb/KG.

When weight is put on the scale (or i move the metal under in the solenoid) the frequency of the square wave drops, and the display counts up. To a max of 136KG/300lb.

This is confirmed by connecting my function generator to the white (signal wire) going to the 3 oin DIN and watching the display increase as I turn down the frequency.

Tinkering around with an N555 and a handful of 4017 ic.s. simple Led chaser idea.

N555 triggers the 1st 4017. This one controls 2 4017s wich at there turn controls the 10 4017s powering 10 leds each. Creating a chaser effect. Eventually the outputs wil control up to 10 leds per output.

Still far from completed. Stil need to figure out how to get the rainbow leds to change colors. As the 4017 is on/of. And the leds are operating between 3 and 3.2volts for changing.

What started ad a simple old-school project is now starting to get complicated 🤔

I took apart quite a few microwaves over a year or so and i never saw a plastic HV fuse in them yet so i thought it would be good to share.

These HV fuses are esentially built using the same principles of operation: during overcurrent the thin thin wire melts and the spring retracts completely (like, totaly completely back) as soon as that wire melts enough. That quick spring retraction helps to quench the arc as fast as possible.

Rated for fast blow 700 mA at 5 kV if you cant read it.

Ripped of the trace when pulling out the transistor that was in there so had to get cteative using solder as the new trace.... ugly but it will do the work.

I’ve been working on a modular IoT platform called Genesis, and wanted to share a fun offshoot of it — a single-port, battery-powered version I’m calling the “Pillar.”

The port on top accepts various plug-in modules, since they all follow a mostly consistent pinout. The interface includes:

• 2x GPIO
• 1x ADC
• I2C, UART, and SPI

It’s just one port, so it’s more of a fun side experiment — but it still supports a decent range of modules. Could be handy for throwing on a relay, sensor, or even a tiny display for field testing. Runs on a Li-Ion battery and has built-in charging via USB-C.

Blue LED for ‘good’ (<600ppm), green LED for ‘average’ (<1000ppm) and red LED for ‘poor’ (>1000ppm).
The board will also print the CO2 values, as they change, on the RTTViewer.

This was a project that I worked on a couple months ago that was really fun and cool, I followed it on YouTube if you look up adhd engineer. (Black was the first version)

Made a full adder with CSD15380F3 N channel FETs and 0402 resistors. I probably won't actually get it made.