TechyMagThings

Letting go is hard, especially when it concerns an irreplaceable space probe like the two Voyagers. Fortunately JPL engineers have managed to pull off a ‘big bang’ switch on Voyager 2, involving two heaters and another device that was kept on to keep providing sufficient heat to the spacecraft to allow it to keep functioning. After all, while the vacuum of space isn’t cold, out in deep space you’re radiating away all your precious heat.

Unfortunately the official press release in exceedingly limited in details, but The Register was kind enough to already nag a NASA spokesperson about it, which gives us some technical details. The short version is that these heaters don’t just keep the electronics within a happy operating range, they also keep the fuel lines warm and capable of providing fuel for attitude adjustments.

With this switch apparently enough of the rapidly diminishing power from the RTG has been freed up that the Voyager 2 has just gained a whole extra year on its extended mission. The JPL team hopes to perform the same switch on the Voyager 1 spacecraft soon, giving it a similar boost to its expected lifespan, before both of them go quiet in the depths of space.

Thanks to [Mark Stevens] for the tip.

You’ve probably heard of rubidium frequency standards, which are used where you need an extremely accurate time or frequency reference. [IMSAI] guy has a good explainer video about what’s actually going on inside one of these standards. Much of the basic idea also applies to cesium standards.

The explainer starts with the periodic table. Rubidium and cesium are both alkali metals, with a single electron in their outermost electron shell. Rubidium has 37 electrons, with the outermost one relatively loosely bound. Naturally occurring rubidium consists mainly of two isotopes, rubidium-85 and rubidium-87, which have the same number of protons and electrons but different numbers of neutrons.

A rubidium standard typically has three gas cells that have a bit of rubidium in them. An RF-excited rubidium-87 discharge lamp produces light at very specific wavelengths. The RF energy excites rubidium atoms into higher electronic states, and when their electrons fall back to lower-energy states, the atoms emit photons.

That light passes through a filter cell containing rubidium-85. The filter preferentially absorbs part of the lamp’s spectrum, leaving light that optically pumps the rubidium-87 atoms in the second resonance cell into one of two closely spaced hyperfine states of the atom’s ground state.

Those two states differ because of the interaction between the magnetic moment of the outer electron and that of the rubidium-87 nucleus. Their energy separation corresponds to a microwave frequency of about 6.835 GHz.

The resonance cell is illuminated by the filtered light while also being exposed to microwave energy from a local oscillator. When the microwave frequency is exactly equal to the rubidium-87 hyperfine transition frequency, it transfers atoms between the two ground-state hyperfine levels. That changes how strongly the cell absorbs the optical pumping light, producing a detectable dip in the light reaching a photodetector.

Electronics then servo the microwave oscillator onto the center of that absorption dip, using a feedback technique somewhat analogous to a phase-locked loop. Once locked, the oscillator is effectively referenced to an atomic transition rather than to the dimensions or mechanical properties of a crystal, giving you an extremely stable frequency standard.

We’ve peeked into these before. Cesium clocks are more accurate, and optical clocks are even better than that.

It’s a complex world out there, and more than ever folks may find themselves in a situation where they want to keep particular bits of information away from prying eyes. At the same time, overly complex methods of file security can make it difficult to share said information with the intended recipients impractical. So what’s the solution?

One proposal from [Ryan Walker] AKA [machinehum] is the Phantomdrive — a fully open source USB flash drive that features a secret secondary filesystem. Not only is the existence of this data hidden from the operating system under normal circumstances, but it’s encrypted with AES-256. Rather than relying on software running on the computer to handle the decryption, the CH569 chip that powers the drive does it internally.

To complete this platform-agnostic approach, [machinehum] had to come up with a way for the user to unlock the secure storage that didn’t require running any code on the client machine. A hardware solution such as a keypad is the obvious answer, but in this case, was out of the question as it would immediately tip off an observer about the drive’s true nature. A covert storage device needs a similarly inconspicuous method of authentication.

That’s why the firmware on the Phantomdrive keeps an eye on all the write operations to the unsecured section of the drive looking for the string password:. Once it sees that, it treats whatever follows as the decryption key. If it’s correct, the previously inaccessible data will appear to the operating system as a new drive.

[machinehum] cautions that none of this has been professionally audited from a security standpoint, and that you should treat this whole concept as an experiment. In other words, it’s probably more than sufficient for the average person, but no guarantees on how long it would last should a three letter agency gets too interested in what you’re up to.

If this seems a bit familiar, it’s because the Phantomdrive follows up [machinehum]’s self-destructing USB flash drive from a few years back. The concept is essentially the same, except this time there’s no Magic Smoke getting released.

We’ve probably all got one item in our toolboxes or chests that we really, really don’t like, but find too handy to toss. For [Someone Should Make That], that item was the bolt-rounding adjustable wrench. Rather than continuing to gripe about it, or alter his habits to make greater use of the full wrench set he also owns, he decided to build a better mousetrap. By mousetrap, we mean adjustable wrench.

It took a couple of iterations on-screen before he hits on a solution that seems to work quite well indeed. The problem [Someone] had with his adjustable wrench was one of physical slop: once adjusted, there’s just too much play in the mechanism, which results in rounded-off bolt heads. [Someone]’s CNC’d solution takes inspiration from the CNC machine that manufactures it: he’s using spring-loading in the adjustment screw akin to what you find in the anti-backlash nut on your CNC mill or 3D printer’s ball threads. The tension from the springs keeps the wrench tight to the bolt, and that keeps [Someone] from rounding them off. Speaking of 3D printers, he prototyped in plastic before machining, and the screw in the end product stayed that way. It would be interesting to see how well that holds up.

Not only do we appreciate that it’s solved a common problem many of us have, the ethos of “this angers me, so I shall hack it” is one we support 100%, so do give a watch unless you’re one of those people who absolutely can’t stand videos, even when they’re spring-loaded to have no slop. There’s some good tips for beginner CNC operators in there, too.

This isn’t the first time someone’s tried to reinvent this particular wheel, though the last version we liked was a ratchet.

For decades now, companies like Michelin have been teasing us with futuristic-looking automobile tires that don’t use air. Instead, they use a polymer mesh of sorts which maintains the same pressure on the travel surface that a pneumatic tire does, with much less maintenance than their pneumatic counterparts. At least, in theory. There’s a reason that these tires live in the same mythical realm that Half Life 3 and the modern affordable Volkswagen do, and [Berm Peak] decided to discover those reasons for himself.

Of course, [Berm Peak] isn’t building these for his daily driver, an electric pickup truck featured in previous videos of his. He’s putting these on his mountain bike instead, a challenging environment for a tire like this in its own right. When mountain biking at the level he does, punctures and flats can become a real nuisance on the trail, so he set about experimenting with these designs with the 3D printer to see if he could make something rivaling pneumatic technology. After a few design iterations he settled on a TPU-based version with a compliant S-shaped spacing between the tread and wheel. The tire printed in sections that are installed by joining them together on the bike rim with a separate 3D printed rim interface.

At the end of this process [Berm Peak] ends up with a surprisingly capable tire that mostly holds up to his extreme off-road testing, an impressive feat for something 3D printed in his shop. Presumably a company specializing in bicycle tires could build something even more capable, but it turns out that a different technology has already solved all of the problems that airless tires solve. Mountain bikers today almost exclusively ride on tires with sealant, so punctures and flats are essentially a solved problem. But the neon-green airless tires were still a fun project for [Berm Peak] and quite the head-turner out on the bike trails.

After the release of Google’s Chromecast so-called ‘streaming sticks’ have remained a popular form factor, even though such technology is these days part of ‘smart’ TVs. Being curious as to what kind of hardware they put into these sticks or dongles these days, [electronupdate] decided to do his typical full teardown of a 2026 model Fire Stick HD from Amazon, including the typical nekkid die shots.

Although most of the bits inside are fairly typical, being just your typical Mediatek-sourced solution, the ceramic patch antennas for Bluetooth and Wi-Fi are a rather interesting detail, as are the purported limitations that make this the ‘HD’ version of the Fire Stick, unlike its 4K brethren.

The used Mediatek MT8698D SoC isn’t so different from the SoC in those 4K versions, with the 2025-era 4K Plus using the MT8696D, but the 4K Select using basically the same SoC as the HD version, featuring the same G310V2 GPU at 500 MHz per the Amazon Developer documentation and the same decoder block (VPU), both of which are capable of 4K video decoding. This implies that the HD vs 4K distinction is purely software-based.

After popping open the device and noting the various ICs, the NAND Flash, the Mediatek MT7902 wireless IC, the PMIC and the aforementioned SoC all have their caps popped in order to take a closer look at their dies. For reference, as one of the largest ICs, the SoC die is a mere 5.2 x 6.45 mm. The PMIC die is more interesting as usual, as this one integrates USB-PD functionality, adding quite a bit of logic to what is otherwise a fairly mundane bit of power management features.

Overall not a very surprising design, though it does tickle that thought in the back of one’s mind whether it could be turned into a ‘4K stick’ with a few software tweaks, or perhaps more simply by installing plain Android onto its 8 GB of eMMC.

We’ve always taken a certain childlike joy in seeing tiny things made big, and big things tiny. Evidently [Uncle Stem] is the same way, if this 7x sized 16×2 “LCD” display is any indicator.

“LCD” is in scare quotes there, because while the original display is a character LCD, [Uncle Stem]’s embigginated recreation is not. Liquid crystal displays are beyond all but the most dedicated DIYers, so [Stem] recreated the whole thing with addressable LEDs instead — over a thousand of them. Each character got its own PCB, and rather than pay for assembly [Stem] used a 3D printed stencil to help apply solder paste, an idea we’ve seen before. His choice of long lengths of nickle strip — the stuff you spot weld to Li-ion batteries — to join the LED-holding PCBs is also worth noting.

In order to get his giant display to act like the I2C-operated module he loves, [Uncle Stem] equipped it with an RP2040 pre-programmed with the LCD character set. That way he can plug it into any Arduino project that uses the LiquidCrystal_I2C library and have the authentic 1602 experience. The green “PCB” the display is mounted to is actually laser-cut plywood, while some acrylic sits in front of his PCBs with office paper to act as as a diffuser. A 3D printed frame completes the illusion. He even goes so far as to replicate the pin headers at 7:1 scaling with brass rods.

He also connects it to a over-sized Arduino, with giant jumper wires. But for the record, not the giant Arduino we featured previously. Like we said, hackers like to mess with scale, and we’ve seen everything from giant benchies to a working Mac Classic for Barbie.