Reddit:Electronics

Yet another magic smoke cloud frozen in the transparent gel.
The rectifier diode(s) of this unit got overloaded, probably by a short circuit on the power board.

https://preview.redd.it/s231wzag0wqc1.png?width=1280&format=png&auto=webp&s=abea0250ccd9b134dc01061b08a0de636e269aee

https://preview.redd.it/9aa1nlui0wqc1.png?width=1280&format=png&auto=webp&s=1a42b2a6f35aec10feb93bf2a925eaf8d55ade25

Anyone know what this component is? It's on the power supply side of the pcb

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This one was found in august of last year while looking for single pole multiple throw switches.

So I dissembled a old broken vhr and I was really surprised when I found out they used a axial motor back in the day, I thought it was only recently used so yeah

Admiration for this beautiful technology I own.

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POV display working

The idea was to build a 128 pixel POV display that can display small GIF images. Happy with how it turned out. Like always the GERBER, Code and 3D model is made open-source

Also built a Image to code converter for this POV display : https://circuitdigest.com/calculators/pov-display-image-to-code-converter

POV display with 3D printed enclosure

Full tutorial: POV Displayfrom CircuyitDigest

So uh apparently I must’ve forgotten to set my dimensions to the silkscreen layer and it printed as traces since it was on the signal layer 😆🤦

This author (Stephen Fleeman) is a retired engineering professor and aerospace engineer, who loves electronics and is one of the most genius circuit analysis gurus I’ve ever met.

This is his most recent article on engineering.com. Check out the others too if you like this one!

A few days ago I asked this subreddit and a few other subreddits how to fix white noise issue of IEMs while using with laptop. A lot of you suggested to get an impedance adapter. However those are very expensive despite that the device is actually a very simple circuit that can be made at home with some soldering ability.

So that's what I did and it solved the issue. I got the schematic from this guide on diyaudioheaven and made the circuit on a small piece of perfboard/Veroboard.

Things required:

1. Small Veroboard
2. 4 resistors, preferably less than 100 ohm
3. An audio socket
4. An audio cable
5. For soldering: a soldering iron and a small amount of solder wire.

Here is the picture of what I made.

https://preview.redd.it/uomy1le1qbpc1.jpg?width=4160&format=pjpg&auto=webp&s=c7dfcc427298a8b7ab5f28559f223b154dcdb809

I am not putting the image of the backside where all the connections are made because I've taped it and I am too lazy to remove and reapply and also because it won't help anyone who won't understand the original schematic in the first place.

I didn't notice any change in the sound quality however people listening to music might notice as the connections are not super precise. I use my IEMs to listen to lectures and podcasts, the white noise was getting very annoying in any long hearing sessions, which my circuit solved. In the end I am glad.

'Model 001' is a free-formed 'Talking Clock' with a strong 'Star Wars' audio theme. It also acts as a complete MP3 player.

The clock was designed as a gift to my son and reacts to a set of dates and times specific to him. An hourly chime function announces the current time using my voice and personalized messages to him.

The clock is interactive, providing a text-based interface and menus, accessible over a serial Bluetooth interface. To keep the interface secure, the clock uses a one-time password login scheme, using its OLED display to present the required login code needed from the user.

The menus hide many personal 'Easter Eggs', waiting to be discovered. It reacts to good and bad input with contextual 'Star Wars' sound effects.

The clock's main structure is built using 2mm copper welding rods, 0.8mm brass rods and 20 AWG bare copper wire were used for wiring components. The clock's electronics are commonly found electronic components, such as a Raspberry Pi Pico RP2040, a DS3231 RTC, a HC-06 serial Bluetooth module, a DFPlayer Mini MP3 player chip, a small HW-404 amplifier and a 128x64 SSD1306 blue OLED display. Two 4 Ohm / 3 Watt speakers are connected to the HW-404 amplifier and provide a crisp audio ouput.

The square wooden base of the clock provides illumination, thanks to an RGB LED as well as power for the clock itself.

The firmware for this clock was written in Go / TinyGo, along with a pure Go driver for the DFPlayer Mini MP3 chip.

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https://preview.redd.it/i3zm9yub8zoc1.jpg?width=4160&format=pjpg&auto=webp&s=bb56cdbe721b4de7837099e005eedcc9c17515bc

https://preview.redd.it/ymsxxyub8zoc1.jpg?width=4160&format=pjpg&auto=webp&s=b6cc20eacf66bd58e1d6ce6cae6be073b6b6dd83

https://preview.redd.it/hvl301vb8zoc1.jpg?width=4160&format=pjpg&auto=webp&s=d038e186a6c0d8f864e5128a2657d27ef7948863

https://preview.redd.it/zid2wzub8zoc1.jpg?width=4160&format=pjpg&auto=webp&s=b82da579c58e040bd75f4e2f76ceb320e7189993