There’s plenty of debate about drop-in LED headlight bulbs, especially when they’re used with older reflector housings that were designed for halogen bulbs. Whether or not you personally feel the ultra-bright lights are a nuisance, or even dangerous, one thing we can all agree on is that they’re clearly the result of some impressive engineering.
Which is why we were fascinated to see the teardown [TechChick] did on a “Ultra 2 LED” retrofit from GTR Lighting. Apparently one of the diodes was failing, and as part of the warranty replacement process, she was informed she had to make it completely inoperable. Sounds like a teardown dream come true. If a manufacturer ever told us we needed to take something apart with extreme prejudice and provide photographic evidence that the deed was done, we’d be all too happy to oblige.
The driver itself ended up being completely filled with potting compound, so she doesn’t spend much time there. Some will no doubt be annoyed that [TechChick] didn’t break out the small pointy implements and dig all that compound out, but we all pretty much know what to expect when it comes to driving LEDs. The real interesting bit is the bulb itself.
As is common with these high-output automotive LEDs, the Ultra 2 is actively cooled with a small fan that’s actually enclosed within the heatsink. With the fan and the two-piece heatsink removed, she’s able to access the LED module itself. Here, two PCBs are sandwiched back to back with a hollow copper chamber that leads out of the rear of the module. When [TechChick] cut into the copper she said she heard a hiss, and assumed it was some kind of liquid cooling device. Specifically we think it’s a vapor chamber that’s being used to pull heat away from the diodes and into the heatsink at the rear of the module, which speaks to the advanced technology that makes these bulbs possible.
Sure the box said they would last for years or even decades, but anyone who’s picked up some bargain LED bulbs knows the reality is a bit more complicated. Sometimes a few LEDs in the array pop, reducing the overall light output. More commonly, the power supply starts to fail and the bulb begins to flicker or hum. In either event, you end up pulling the bulb and replacing it.
But [Bifferos] thinks we can do a bit better than that. Rather than just chalking it up to poor QA and tossing the bulb, why not do a little exploratory surgery to identify salvageable LEDs in an otherwise “dead” bulb? After pulling apart a couple of burned out bulbs (name brand and otherwise), he was able to pull out an impressive number of handy LED panels that could be easily repurposed. Naturally, with a little more coaxing, the individual SMD LEDs could be liberated and pushed into service as well.
As you might expect, there are far too many different LED bulbs out there to create a comprehensive teardown guide, but [Bifferos] does provide some tricks to help get the bulb open without hurting yourself or destroying the thing in the process. Once inside, the design of the bulb will dictate what happens next. Bulbs with multiple arrays of LEDs on their own PCBs can be easily broken down, but if there’s just the single board, you may want to pull the LEDs off individually. To that end, the write-up demonstrates efficient methods of stripping the LEDs using either hot air or a pair of soldering irons.
Normally when we see blinky projects these days, it’s using addressable LED strips with WS2812Bs, or similar alternatives. However, old-school blobby round LEDs are still on the market, and can still be put to great use. These DIY LED shoes from [TechnoChic] are an excellent example of just that.
The shoes use big 10mm LEDs that have color-changing smarts baked in. Simply power them up and they’ll fade between a series of colors. They’re run from a coin cell sewn on to the side of each shoe, with the LEDs jammed into the rear of the sole. A conductive product called Maker Tape is then used to create a circuit for the LEDs and the coin cell, along with a pressure switch inside each shoe. When the wearer puts weight on their heel, the switch conducts, lighting up the LEDs as the wearer takes each step.
The ESP32 has enabled an uncountable number of small electronics projects and even some commercial products, thanks to its small size, low price point, and wireless capabilities. Plenty of remote sensors, lighting setups, and even home automation projects now run on this small faithful chip. But being relegated to an electronics enclosure controlling a small electrical setup isn’t all that these tiny chips can do as [Eirik Brandal] shows us with this unique piece of audio and visual art.
The project is essentially a small, automated synthesizer that has a series of arrays programmed into it that correspond to various musical scales. Any of these can be selected for the instrument to play through. The notes of the scale are shuffled through with some random variations, allowing for a completely automated musical instrument. The musical generation is entirely analog as well, created by some oscillators, amplifiers, and other filtering and effects. The ESP32 also controls a lighting sculpture that illuminates a series of LEDs as the music plays.
The art installation itself creates quite haunting, mesmerizing tunes that are illustrated in the video linked after the break. While it’s not quite to the realm of artificial intelligence since it uses pre-programmed patterns with some randomness mixed in, it does give us hints of some other projects that have used AI in order to compose new music.
Like many of us, [quincy] feels the distracting pull of non-work programs on what has become a mixed-use computer. So what’s the answer to the puzzle of work-life balance? We’re not sure, but time management and keeping track of tasks will probably get you most of the way there. The only problem is that keeping track of these things is boring and tedious and way too easy to forget, even for the fun tasks.
Similar commercial gadgets exist to serve this time-tracking purpose, but [quincy] wanted something much cooler that would work the same way: turn the indicator to the current task, and the status gets recorded on a computer. Rather than some smart polygon with informative stickers on each face à la the Timeflip2, [quincy] built a rotary task manager that serves the same purpose, but does it with magnets.
Our favorite part aside from the magnets has to be the clever binary encoding work. [quincy] is using three photoresistors and a single green LED to create a 3D-printed gray encoder that sidesteps the need to ever flip two bits at once. An Arduino takes care of reading the 3-bit code and converting it back into a decimal. There are more updates to come, including the main .ino file, but you can start printing the pieces while you wait.
If you have trouble staying on task, maybe you need a Pomodoro timer. We’ve seen a few over the years, ranging from the minimal to the sculptural.
[Matou] has always been entranced by the beauty of natural crystal formations [and has long wished for a glowing crystal pendant]. Once he got a resin-based 3D printer, he was majorly disappointed to find out that although transparent resin prints look like delicious candy when they’re still wet, they turn cloudy and dull after being washed in an isopropyl bath and cured with UV light. There must be a way to either polish pieces back to clear, or keep them clear in the first place, [Matou] thought, and set about experimenting with some test crystals (video, embedded below).
As [Matou] found out, the dullness is caused by surface imperfections. Resin prints have layer lines, too, and although they may be super fine and invisible to the naked eye, they will still scatter light. The choices seem obvious — either polish the proud parts down with many grits of sandpaper, or fill the valleys with something to smooth everything out. As you’ll see in the video after the break, [Matou] tried it all, including a coat of the same resin that made the print. It’s an interesting look at the different ways to smooth out resin prints, though you may not be surprised to find that the one with the most work put into it looks the best.
There are a few words in the electrical engineering lexicon that will perk any hardware hacker’s ears. The first of course is “Nixie tubes” with their warm cold war era ambiance and nostalgia inducing aura. A close second is “relay logic”. Between their place in computing and telecom history and the way a symphony of click and clatter can make a geek’s heart go pitter patter, most of us just love a good relay hack. And then there’s the classic hacker project: A unique timepiece to adorn our lair and remind us when we’ve been working on our project just a little too long, if such a thing even exists.
With those things in mind, you can forgive us if we swooned ever so slightly when [Jon Stanley]’s Relay Logic Nixie Tube Clock came to us via the Tip Line. Adorned with its plethora of clicking relays and set aglow by four Nixie tubes, the Relay Logic Nixie Tube Clock checks all our boxes.
[Jon] started the build with relay modules that mimic CD4000 series CMOS logic chips. When the prototype stage was complete, the circuit was recreated on a new board that mounts all 55 Omron relays on the same PCB. The result? A glorious Nixie tube clock that will strike envy into even the purest hacker’s heart. Make sure to watch the video after the break!