Reddit:Electronics

So I made those PCBs at home. Those are adapters from SOP to DIP so prototyping is easier. Took me like a day

I think you already know, but since July 1st a tax of €3 per ARTICLES is now mandatory. (they say it’s by categories but in reality, no)

For €30 of electronic components, I have +€50 of taxes. For a person who has started to be interested in electronics recently, it hurts.

So I come to try to find alternatives to aliexpress, with similar prices if possible… If the delivery lasts 6 months but there are no taxes I DONT CARE, I need the components at an affordable price.

Thanks, and I hope that the aliexpress sellers will quickly find a solution for us

Purchased AD SSM2019 amplifier from DigiKey, only 1 unit. Got 26… :)

Don't ask me, ts is on another whole level of abstract

Ignore the rock drawer I didn't have a better place for my cool rocks

I have a couple of these receivers I got in a pile of old stuff and by defuse they're USB but I wanted to use them with my microcontrollers, so I ripped one apart with a simple pry tool then removed the pressed on RF shield to expose the goodies.

Looking at the USB to serial transceiver, I see it's a PL-2303HX and looking at the datasheet, pin 1 is serial TX and pin 5 is serial RX, so I traced them to two open solder bridges.

Closing those to solder bridges with questionable soldering using an oversized tip resulted in the two unused pins now making connection

I decided to use the existing cabling so I used a small pry tool to lift up the plastic tab holding the green and white USB data wires and pulled them out and inserting them into their new homes

After snipping off the USB connector, red to +5v, black to negative, and the two serial lines to my ESP32 pins,

I started streaming NMEA datagrams over uart ❤️

NOTE: the default speed for this receiver is 4800bps

"This model was specifically designed for microelectronics, eliminating the image lag common in cheap USB microscopes connected to a PC."

Here's some animations I made of transistors turning on and off. In order, we have an NPN BJT, n-channel MOSFET, and finally an n-channel JFET. The red and blue dots represent electrons and holes, and white flashes are recombination events. The density of dots is proportional to the actual density of charge carriers.

In the first set of animations, the velocity of the dots is equal to the velocity obtained by summing the diffusion and drift currents and dividing by the charge density, but diffusion is not explicitly shown. In the second set of animations, the dots undergo diffusion and drift, and this makes it a more correct depiction of carrier motion. The drawback is of course that the jiggling makes it more visually confusing.

I made these with my semiconductor simulator (https://brandonli.net/semisim/). I also have higher quality versions of the animations here.

Very simple circuit - i had a bunch of these charger/booster modules laying around and decided to learn about the dangers of bare 18650 batteries. Excited to do more.

I wanted to modify my PS3 controller to USB-C, but it used a through hole connector. Not a problem!

Nice and simple two transistor flasher, with a red and blue LED.
I kind of wish I had opted for warm white LED behind the colored lens, and that would have given a more natural halogen look.

I accidentally selected the wrong resistor value for this board, but I still wanted to test whether the circuit worked. The original footprint was 0201 imperial — 0603 metric, and I needed a resistance of 17 kΩ.

Since I did not have a 17 kΩ resistor in 0201 size, I improvised with three larger 0402 resistors connected in series: 15 kΩ + 1 kΩ + 1 kΩ

I soldered them together as a small bridge directly onto the original 0201 pads.

The entire repair was done by hand with a soldering iron and tweezers, without using a microscope. I only used the microscope afterwards to take the close-up photo.

It may not be the most elegant solution, but it measured correctly and allowed me to continue testing the board. The second photo includes an M3 screw for scale.

What do you think?

Hi everyone! I'm looking to connect with other women in the electronics field to share projects and support each other. I actually started a community specifically for this at r/HardwareWomen. If you're interested in joining a dedicated space for women in tech/electronics, we'd love to have you!

I'm terrified to be honest. Those were supposed to be stm32 microcontrollers but there are only their corpses...