Pickle Diodes, Asymmetric Jacobs Ladders, and Other AC Surprises
?w=577" alt=""/>While we’re 100 years past Edison’s fear, uncertainty, and doubt campaign, the fact of the matter is that DC is a bit easier to wrap one’s head around. It’s just https://hackaday.com/2026/01/03/pickle-diodes-asymmetric-jacobs-ladders-and-other-ac-surprises/
https://hackaday.com/2026/01/03/pickle-diodes-asymmetric-jacobs-ladders-and-other-ac-surprises/
Printing in Metal with DIY SLM
?w=800" alt="A bed of metal powder is visible through a green-tinted window. A fused metal pattern, roughly square, is visible, with one corner glowing white and throwing up sparks."/>An accessible 3D printer for metals has been the holy grail of amateur printer builders since at least the beginning of the RepRap project, but as tends to be the https://hackaday.com/2026/01/03/printing-in-metal-with-diy-slm/
https://hackaday.com/2026/01/03/printing-in-metal-with-diy-slm/
Zork Running on 4-Bit Intel Computer
?w=800" alt=""/>Before DOOM would run on any computing system ever produced, and indeed before it even ran on its first computer, the game that would run on any computer of the https://hackaday.com/2026/01/03/zork-running-on-4-bit-intel-computer/
https://hackaday.com/2026/01/03/zork-running-on-4-bit-intel-computer/
Benchmarking Windows Against Itself, from Windows XP to Windows 11
?w=800" alt=""/>Despite faster CPUs, RAM and storage, today’s Windows experience doesn’t feel noticeably different from back in the 2000s when XP and later Windows 7 ruled the roost. To quantify this https://hackaday.com/2026/01/02/benchmarking-windows-against-itself-from-windows-xp-to-windows-11/
https://hackaday.com/2026/01/02/benchmarking-windows-against-itself-from-windows-xp-to-windows-11/
A Steam Machine Clone For An Indeterminate but Possibly Low Cost
?w=800" alt=""/>For various reasons, crypto mining has fallen to the wayside in recent years. Partially because it was never useful other than as a speculative investment and partially because other speculative https://hackaday.com/2026/01/02/a-steam-machine-clone-for-an-indeterminate-but-possibly-low-cost/
https://hackaday.com/2026/01/02/a-steam-machine-clone-for-an-indeterminate-but-possibly-low-cost/
Qron0b: a Minimalist, Low-Power BCD Wristwatch
?w=800" alt=""/>Over the decades we have seen many DIY clocks and wrist watches presented, but few are as likely to get you either drawing in the crowds, or quietly snickered at https://hackaday.com/2026/01/02/qron0b-a-minimalist-low-power-bcd-wristwatch/
https://hackaday.com/2026/01/02/qron0b-a-minimalist-low-power-bcd-wristwatch/
Adding Solar Power to an Electric Tractor
?w=800" alt="The solar-electric tractor is out standing in its field."/>In my country, we have a saying: the sun is a deadly lazer. Well, it’s not so much a folk saying as a meme, and not so much in one https://hackaday.com/2026/01/02/adding-solar-power-to-an-electric-tractor/
https://hackaday.com/2026/01/02/adding-solar-power-to-an-electric-tractor/
Jailbreaking the Amazon Echo Show
?w=800" alt=""/>As locked-down as the Amazon Echo Show line of devices are, they’re still just ARM-based Android devices, which makes repurposing it somewhat straightforward as long as what you want is https://hackaday.com/2026/01/02/jailbreaking-the-amazon-echo-show/
https://hackaday.com/2026/01/02/jailbreaking-the-amazon-echo-show/
Low-Cost, Portable Streaming Server
?w=800" alt=""/>Thanks to the Raspberry Pi, we have easy access to extremely inexpensive machines running Linux that have all kinds of GPIO as well as various networking protocols. And as the https://hackaday.com/2026/01/02/low-cost-portable-streaming-server/
https://hackaday.com/2026/01/02/low-cost-portable-streaming-server/
Liquid CO2 For Grid Scale Energy Storage Isn’t Just Hot Air
There’s folk wisdom in just about every culture that teaches about renewable energy — things like “make hay while the sun shines”. But as an industrial culture, we want to https://hackaday.com/2026/01/02/liquid-co2-for-grid-scale-energy-storage-isnt-just-hot-air/
https://hackaday.com/2026/01/02/liquid-co2-for-grid-scale-energy-storage-isnt-just-hot-air/
Print Your Own Standardized Wire Spool Storage
?w=800" alt=""/>Hardware hackers tend to have loads of hookup wire, and that led [firstgizmo] to design a 3D printable wire and cable spool storage system. As a bonus, it’s Gridfinity-compatible! There https://hackaday.com/2026/01/02/print-your-own-standardized-wire-spool-storage/
https://hackaday.com/2026/01/02/print-your-own-standardized-wire-spool-storage/
Making the Fastest LEGO Technic Air-Powered Engine
?w=800" alt=""/>Just because LEGO Technic is technically a toy doesn’t mean that you cannot do solid engineering with it, like building air-powered engines. After first building a simple air-powered piston engine, https://hackaday.com/2026/01/01/making-the-fastest-lego-technic-air-powered-engine/
https://hackaday.com/2026/01/01/making-the-fastest-lego-technic-air-powered-engine/
Terminal-Based Web Browsing with Modern Conveniences
?w=800"/>Programmers hold to a wide spectrum of positions on software complexity, from the rare command-line purists to the much more common web app developers, and the two extremes rarely meet. https://hackaday.com/2026/01/01/terminal-based-web-browsing-with-modern-conveniences/
https://hackaday.com/2026/01/01/terminal-based-web-browsing-with-modern-conveniences/
Putting a Cheapo 1800W DC-DC Boost Converter to the Test
?w=800" alt=""/>These days ready-to-use DC-DC converters are everywhere, with some of the cheaper ones even being safe to use without an immediate risk to life and limb(s). This piques one’s curiosity https://hackaday.com/2026/01/01/putting-a-cheapo-1800w-dc-dc-boost-converter-to-the-test/
https://hackaday.com/2026/01/01/putting-a-cheapo-1800w-dc-dc-boost-converter-to-the-test/
Building a Steam Loco These Days is Nothing But Hacks
?w=625"/>The Pennsylvania Railroad (PRR)’s T1 class is famous for many reasons: being enormous, being a duplex, possibly having beaten Mallard’s speed record while no one was looking… and being in https://hackaday.com/2026/01/01/building-a-steam-loco-these-days-is-nothing-but-hacks/
https://hackaday.com/2026/01/01/building-a-steam-loco-these-days-is-nothing-but-hacks/
Our New Years Wish is to Hide in a Giant Pokéball
?w=800" alt="A giant pokeball is the best place to hide this holiday season."/>Between the news, the world situation, and the inevitable family stresses that come this time of year, well — one could be excused for feeling a certain amount of envy https://hackaday.com/2026/01/01/our-new-years-wish-is-to-hide-in-a-giant-pokeball/
https://hackaday.com/2026/01/01/our-new-years-wish-is-to-hide-in-a-giant-pokeball/
The Cutting Truth about Variable Capacitors
?w=800" alt=""/>If you’ve seen a big air-variable capacitor, you may have noticed that some of the plates may have slots cut into them. Why? [Mr Carlson] has the answer in the https://hackaday.com/2026/01/01/the-cutting-truth-about-variable-capacitors/
https://hackaday.com/2026/01/01/the-cutting-truth-about-variable-capacitors/
Jon Peddie’s The Graphics Chip Chronicles On Graphics Controller History
?w=800" alt=""/>Using computers that feature a high-resolution, full-color graphical interface is commonplace today, but it took a lot of effort and ingenuity to get to this point. This long history is https://hackaday.com/2026/01/01/jon-peddies-the-graphics-chip-chronicles-on-graphics-controller-history/
Trace Tracing to the Tunes
?w=800" alt=""/>Some kind of continuity beeper has been a standard piece of gear since the dawn of electronics. Sure, you probably have an ohm meter, but sometimes you don’t care about https://hackaday.com/2026/01/01/trace-tracing-to-the-tunes/
The Many-Sprites Interpretation of Amiga Mechanics
?w=800" alt=""/>The invention of sprites triggered a major shift in video game design, enabling games with independent moving objects and richer graphics despite the limitations of early video gaming hardware. As https://hackaday.com/2025/12/31/the-many-sprites-interpretation-of-amiga-mechanics/
https://hackaday.com/2025/12/31/the-many-sprites-interpretation-of-amiga-mechanics/
Chamber Master: Control Your 3D Printer Enclosure Like a Pro
?w=800" alt="Chamber-Master"/>Having an enclosed 3D printer can make a huge difference when printing certain filaments that are prone to warping. It’s easy enough to build an enclosure to stick your own https://hackaday.com/2025/12/31/chamber-master-control-your-3d-printer-enclosure-like-a-pro/
https://hackaday.com/2025/12/31/chamber-master-control-your-3d-printer-enclosure-like-a-pro/
Modernizing a Classic Datsun Engine
?w=800" alt=""/>Although Nissan has been in the doldrums ever since getting purchased by Renault in the early 2000s, it once had a reputation as a car company that was always on https://hackaday.com/2025/12/30/modernizing-a-classic-datsun-engine/
https://hackaday.com/2025/12/30/modernizing-a-classic-datsun-engine/
Thorium-Metal Alloys and Radioactive Jet Engines
?w=800" alt=""/>Although metal alloys is not among the most exciting topics for most people, the moment you add the word ‘radioactive’, it does tend to get their attention. So too with https://hackaday.com/2025/12/16/thorium-metal-alloys-and-radioactive-jet-engines/
https://hackaday.com/2025/12/16/thorium-metal-alloys-and-radioactive-jet-engines/
Unusual Circuits in the Intel 386’s Standard Cell Logic
?w=800" alt=""/>Intel’s 386 CPU is notable for being its first x86 CPU to use so-called standard cell logic, which swapped the taping out of individual transistors with wiring up standardized functional https://hackaday.com/2025/11/25/unusual-circuits-in-the-intel-386s-standard-cell-logic/
https://hackaday.com/2025/11/25/unusual-circuits-in-the-intel-386s-standard-cell-logic/
Learn What a Gaussian Splat Is, Then Make One
?w=700" alt=""/>Gaussian Splats is a term you have likely come across, probably in relation to 3D scenery. But what are they, exactly? This blog post explains precisely that in no time https://hackaday.com/2025/10/31/learn-what-a-gaussian-splat-is-then-make-one/
https://hackaday.com/2025/10/31/learn-what-a-gaussian-splat-is-then-make-one/
There’s Nothing Boring About Web Search on Retro Amigas
?w=800" alt="The most exciting search engine 68k can handle."/>Do you have a classic Amiga computer? Do you want to search the web with iBrowse, but keep running into all that pesky modern HTML5 and HTTPS? In that case, https://hackaday.com/2025/10/31/theres-nothing-boring-about-web-search-on-retro-amigas/
https://hackaday.com/2025/10/31/theres-nothing-boring-about-web-search-on-retro-amigas/
Hacking Together an Expensive-Sounding Microphone At Home
?w=800" alt=""/>When it comes to microphones, [Roan] has expensive tastes. He fancies the famous Telefunken U-47, but doesn’t quite have the five-figure budget to afford a real one. Thus, he set https://hackaday.com/2025/10/30/hacking-together-an-expensive-sounding-microphone-at-home/
https://hackaday.com/2025/10/30/hacking-together-an-expensive-sounding-microphone-at-home/
PhantomRaven Attack Exploits NPM’s Unchecked HTTP URL Dependency Feature
?w=800" alt=""/>Having another security threat emanating from Node.js’ Node Package Manager (NPM) feels like a weekly event at this point, but this newly discovered one is among the more refined. It https://hackaday.com/2025/10/30/phantomraven-attack-exploits-npms-unchecked-http-url-dependency-feature/
100-Year Old Wagon Wheel Becomes Dynamometer
?w=800" alt=""/>If you want to dyno test your tuner car, you can probably find a couple of good facilities in any nearby major city. If you want to do similar testing https://hackaday.com/2025/10/30/100-year-old-wagon-wheel-becomes-dynamometer/
https://hackaday.com/2025/10/30/100-year-old-wagon-wheel-becomes-dynamometer/
The Supercon 2025 Badge is Built to be Customized
?w=800" alt=""/>For anyone who’s joined us for previous years, you’ll know that badge hacking and modification are core to the Hackaday Supercon experience. While you’re of course free to leave the https://hackaday.com/2025/10/27/the-supercon-2025-badge-is-built-to-be-customized/
https://hackaday.com/2025/10/27/the-supercon-2025-badge-is-built-to-be-customized/
Relay Computer Knows the Sequence
?w=769" alt=""/>When we first saw [DiPDoT’s] homebrew computer, we thought it was an Altair 8800. But, no. While it has a very familiar front panel, the working parts are all based https://hackaday.com/2025/10/25/relay-computer-knows-the-sequence/
https://hackaday.com/2025/10/25/relay-computer-knows-the-sequence/
ESP32 Invades Old TV Box: Forecast More Than Just Channels
?w=800" alt="ESPTimeCastVFD"/>Obsolete hardware is all around us, and some of it has some pretty interesting tech buried within. One such device is an old Belgacom TV Box. Instead of using the https://hackaday.com/2025/10/22/esp32-invades-old-tv-box-forecast-more-than-just-channels/
https://hackaday.com/2025/10/22/esp32-invades-old-tv-box-forecast-more-than-just-channels/
Reverse Engineering STL Files with FreeCAD
?w=800" alt=""/>If you think about it, STL files are like PDF files. You usually create them using some other program, export them, and then expect them to print. But you rarely https://hackaday.com/2025/10/21/reverse-engineering-stl-files-with-freecad/
https://hackaday.com/2025/10/21/reverse-engineering-stl-files-with-freecad/
Classy Desk Simulates Beehive Activity
?w=800" alt=""/>Beehives are impressive structures, an example of the epic building feats that are achievable by nature’s smaller creatures. [Full Stack Woodworking] was recently building a new work desk, and decided https://hackaday.com/2025/10/20/classy-desk-simulates-beehive-activity/
https://hackaday.com/2025/10/20/classy-desk-simulates-beehive-activity/
Ask Hackaday: When Good Lithium Batteries Go Bad
?w=800" alt=""/>Friends, I’ve gotten myself into a pickle and I need some help. A few years back, I decided to get into solar power by building a complete PV system inside https://hackaday.com/2025/10/20/ask-hackaday-when-good-lithium-batteries-go-bad/
https://hackaday.com/2025/10/20/ask-hackaday-when-good-lithium-batteries-go-bad/
Keep That Engine Running, With a Gassifier
?w=800" alt=""/>Every now and then in histories of the 20th’s century’s earlier years, you will see pictures of cars and commercial vehicles equipped with bulky drums, contraptions to make their fuel https://hackaday.com/2025/10/15/keep-that-engine-running-with-a-gassifier/
https://hackaday.com/2025/10/15/keep-that-engine-running-with-a-gassifier/
Hackaday Links: October 12, 2025
?w=800" alt="Hackaday Links Column Banner"/>We’ve probably all seen some old newsreel or documentary from The Before Times where the narrator, using his best Mid-Atlantic accent, described those newfangled computers as “thinking machines,” or better https://hackaday.com/2025/10/12/hackaday-links-october-12-2025/
https://hackaday.com/2025/10/12/hackaday-links-october-12-2025/
PVC Pipe Structure Design That Skips Additional Hardware
?w=800" alt=""/>[Baptiste Marx] shares his take on designing emergency structures using PVC pipe in a way that requires an absolute minimum of added parts. CINTRE (French, English coverage article here) is https://hackaday.com/2025/10/12/pvc-pipe-structure-design-that-skips-additional-hardware/
https://hackaday.com/2025/10/12/pvc-pipe-structure-design-that-skips-additional-hardware/
Entering the Wild World of Power Over Ethernet
?w=800" alt=""/>As Ethernet became the world-wide standard for wired networking, there was one nagging problem. You already have to plug in the network cable. But then you have to also plug https://hackaday.com/2025/10/11/entering-the-wild-world-of-power-over-ethernet/
https://hackaday.com/2025/10/11/entering-the-wild-world-of-power-over-ethernet/
Mini Laptop Needs Custom Kernel
?w=800" alt=""/>These days, you rarely have to build your own Linux kernel. You just take what your distribution ships, and it usually works just fine. However, [Andrei] became enamored with a https://hackaday.com/2025/09/29/mini-laptop-needs-custom-kernel/
https://hackaday.com/2025/09/29/mini-laptop-needs-custom-kernel/
FLOSS Weekly Episode 848: Open the Podbay Doors, Siri
?w=800" alt=""/>This week Jonathan and Rob chat with Paulus Schoutsen about Home Assistant, ESPHome, and Music Assistant, all under the umbrella of the Open Home Foundation. Watch to see Paulus convince https://hackaday.com/2025/09/24/floss-weekly-episode-848-open-the-podbay-doors-siri/
https://hackaday.com/2025/09/24/floss-weekly-episode-848-open-the-podbay-doors-siri/
Pill Sized Scoop of Your Internals
?w=743" alt="capsule shown with magnetic fields represented with arrows"/>Taking a look inside the human body has never been easier — just swallow a camera in the shape of a pill. However, what is not quite as easy is https://hackaday.com/2025/09/24/pill-sized-scoop-of-your-internals/
https://hackaday.com/2025/09/24/pill-sized-scoop-of-your-internals/
Building Your Own DVB-S2 Receiver
?w=800" alt=""/>Generally, a digital TV tuner is something you buy rather than something you make yourself. However, [Johann] has always been quite passionate about the various DVB transmission standards, and decided https://hackaday.com/2025/09/22/building-your-own-dvb-s2-receiver/
https://hackaday.com/2025/09/22/building-your-own-dvb-s2-receiver/
iPhone Air Still Apparently Repairable Despite Its Compact Construction
?w=800" alt=""/>Miniaturization is a trend that comes and goes in the cellular phone space. For a while, our phones were all getting smaller, then they started getting bigger again as screens https://hackaday.com/2025/09/22/iphone-air-still-apparently-repairable-despite-its-compact-construction/
Hackaday Links: September 21, 2025
?w=800" alt="Hackaday Links Column Banner"/>Remember AOL? For a lot of folks, America Online was their first ISP, the place where they got their first exposure to the Internet, or at least a highly curated https://hackaday.com/2025/09/21/hackaday-links-september-21-2025/
https://hackaday.com/2025/09/21/hackaday-links-september-21-2025/
“Simplest” Oscilloscope is a Cunning Vector Display
?w=800" alt=""/>Superlatives are tricky things. [mircemk]’s guide “How to make Simplest ever Oscilloscope Clock” falls into that category. It’s that word, simplest. Certainly, this is an oscilloscope clock, and a nice https://hackaday.com/2025/09/20/simplest-oscilloscope-is-a-cunning-vector-display/
https://hackaday.com/2025/09/20/simplest-oscilloscope-is-a-cunning-vector-display/
Imagining the CPS-1: An Early 70s 4-bit Microcomputer from Canada
?w=800" alt="A photo of the internal wiring."/>[Michael Gardi] wrote in to let us know about his project: CPS-1: Imagining An Early 70s 4-bit Microcomputer. The CPS-1 was the first Canadian microprocessor-based computer. It was built by https://hackaday.com/2025/09/19/imagining-the-cps-1-an-early-70s-4-bit-microcomputer-from-canada/
https://hackaday.com/2025/09/19/imagining-the-cps-1-an-early-70s-4-bit-microcomputer-from-canada/
Give Your Band The Music Of The Bands
?w=800" alt=""/>The way to get into radio, and thence electronics, in the middle years of the last century, was to fire up a shortwave receiver and tune across the bands. In https://hackaday.com/2025/09/18/give-your-band-the-music-of-the-bands/
https://hackaday.com/2025/09/18/give-your-band-the-music-of-the-bands/
Oil-Based Sprengel Pump Really Sucks
?w=800" alt=""/>Have you heard of the Sprengel pump? It’s how they drew hard vacuum back before mechanical pumps were perfected — the first light bulbs had their vacuums drawn with Sprengel https://hackaday.com/2025/09/17/oil-based-sprengel-pump-really-sucks/
https://hackaday.com/2025/09/17/oil-based-sprengel-pump-really-sucks/
The Practicality Of Solar Powered Meshtastic
?w=800" alt=""/>A Meshtastic node has been one of the toys of the moment over the last year, and since they are popular with radio amateurs there’s a chance you’ll already live https://hackaday.com/2025/09/17/the-practicality-of-solar-powered-meshtastic/
https://hackaday.com/2025/09/17/the-practicality-of-solar-powered-meshtastic/
Serious Chemical Threat Sniffer on a Budget
?w=800" alt="Street with polluted smoggy air"/>Chemical warfare detection was never supposed to be a hobbyist project. Yet here we are: Air Quality Guardian by [debdoot], the self-proclaimed world’s first open source chemical threat detection system, https://hackaday.com/2025/09/16/serious-chemical-threat-sniffer-on-a-budget/
https://hackaday.com/2025/09/16/serious-chemical-threat-sniffer-on-a-budget/
See Voyager’s 1990 ‘Solar System Family Portrait’ Debut
?w=800" alt=""/>It’s been just over 48 years since Voyager 1 was launched on September 5, 1977 from Cape Canaveral, originally to study our Solar System’s planets. Voyager 1 would explore Jupiter https://hackaday.com/2025/09/15/see-voyagers-1990-solar-system-family-portrait-debut/
https://hackaday.com/2025/09/15/see-voyagers-1990-solar-system-family-portrait-debut/
Using an MCU’s Own Debug Peripheral to Defeat Bootrom Protection
?w=800" alt=""/>Released in July of 2025, the Tamagotchi Paradise may look somewhat like the late 90s toy that terrorized parents and teachers alike for years, but it’s significantly more complex and https://hackaday.com/2025/09/10/using-an-mcus-own-debug-peripheral-to-defeat-bootrom-protection/
https://hackaday.com/2025/09/10/using-an-mcus-own-debug-peripheral-to-defeat-bootrom-protection/
Modos is Open Hardware, Easy on the Eyes
?w=800"/>Since e-ink first hit the market a couple decades back, there’s always murmurs of “that’d be great as a second monitor”— but very, very few monitors have ever been made. https://hackaday.com/2025/09/08/modos-is-open-hardware-easy-on-the-eyes/
https://hackaday.com/2025/09/08/modos-is-open-hardware-easy-on-the-eyes/
Ore Formation Processes, Part Two: Hydrothermal Boogaloo
?w=800" alt=""/>There’s a saying in mine country, the kind that sometimes shows up on bumper stickers: “If it can’t be grown, it has to be mined.” Before mining can ever start, https://hackaday.com/2025/09/08/ore-formation-processes-part-two-hydrothermal-boogaloo/
https://hackaday.com/2025/09/08/ore-formation-processes-part-two-hydrothermal-boogaloo/
Camera and ChArUco Keep the Skew Out of Your 3D Prints
?w=800" alt=""/>Do you or a loved one suffer from distorted 3D prints? Does your laser cutter produce parallelograms instead of rectangles? If so, you might be suffering from CNC skew miscalibration, https://hackaday.com/2025/09/06/camera-and-charuco-keep-the-skew-out-of-your-3d-prints/
https://hackaday.com/2025/09/06/camera-and-charuco-keep-the-skew-out-of-your-3d-prints/
The Confusing World of Wood Preservation Treatments
?w=800" alt=""/>Wood is an amazing material to use around the house, both for its green credentials and the way it looks and feels. That said, as a natural product there are https://hackaday.com/2025/08/29/the-confusing-world-of-wood-preservation-treatments/
https://hackaday.com/2025/08/29/the-confusing-world-of-wood-preservation-treatments/
A Tool-changing 3D Printer For the Masses
?w=800" alt="A preproduction U1 sitting on a workbench"/>Modern multi-material printers certainly have their advantages, but all that purging has a way to add up to oodles of waste. Tool-changing printers offer a way to do multi-material prints https://hackaday.com/2025/08/27/a-tool-changing-3d-printer-for-the-masses/
https://hackaday.com/2025/08/27/a-tool-changing-3d-printer-for-the-masses/
RepRapMicron Promises Micro-fabrication for Desktops With New Prototype
?w=618" alt=""/>3D printing has transformed how hobbyists fabricate things, but what additional doors would open if we could go even smaller? The µRepRap (RepRapMicron) project aims to bring fabrication at the https://hackaday.com/2025/08/22/reprapmicron-promises-micro-fabrication-for-desktops-with-new-prototype/
Bad To The Bluetooth: You Shouldn’t Use This Jammer
?w=800" alt=""/>Back in the day, an FM bug was a handy way to make someone’s annoying radio go away, particularly if it could be induced to feedback. But these days you’re https://hackaday.com/2025/08/21/bad-to-the-bluetooth-you-shouldnt-use-this-jammer/
https://hackaday.com/2025/08/21/bad-to-the-bluetooth-you-shouldnt-use-this-jammer/