Seeing Sound for Under $200
<img width="800" height="450" src="![image](https://hackaday.com/wp-content/uploads/2025/12/I-Built-a-Camera-That-Sees-Sound-8-23-screenshot.png?w=800")
alt="A red and blue visualization of the waves from a small ultrasonic speaker"/>There are five general senses: touch for feels, taste for food, smell for avoiding trash, hearing for sounds, and, of course, eyesight for visualizing the very waves making up that 
alt="A red and blue visualization of the waves from a small ultrasonic speaker"/>There are five general senses: touch for feels, taste for food, smell for avoiding trash, hearing for sounds, and, of course, eyesight for visualizing the very waves making up that Hackaday
Seeing Sound For Under $200
There are five general senses: touch for feels, taste for food, smell for avoiding trash, hearing for sounds, and, of course, eyesight for visualiz...
Hackaday
Seeing Sound For Under $200
There are five general senses: touch for feels, taste for food, smell for avoiding trash, hearing for sounds, and, of course, eyesight for visualiz...
![image](https://hackaday.com/wp-content/uploads/2025/12/Prototyping-LED-Pixel-Lanterns-for-a-Light-Parade-5-2-screenshot.png?w=800"){kind=tracking}
alt=""/>[Geeksmithing] and [When Geeks Craft] recently came together for a glowing collaboration. They wanted to build ever more attractive lanterns for a local parade event. They recently discovered a fantastic 
![image](https://hackaday.com/wp-content/uploads/2025/12/Gaming-on-a-Receipt-Printer-50-18-screenshot-1.png?w=800")
alt="a torn-up printer with a very long image of different frames"/>Gaming is a wonderful thing. Unfortunately for many of us, work takes up our valuable time, which should be allocated to our gaming. What if there was a better way? 
![image](https://hackaday.com/wp-content/uploads/2025/12/active_ideal_bridge_rectifier_TEA2208T_mousa_youtube.jpg?w=800")
alt=""/>Everyone loves a full-wave bridge rectifier, but there’s no denying that they aren’t 100% efficient due to the diode voltage drop. Which isn’t to say that with some effort we 
![image](https://hackaday.com/wp-content/uploads/2025/12/3D-printed-LED-panel-mount-banner.png?w=799")
alt=""/>LED bezels (also known as LED panel-mount holders) are great, so how about 3D printing the next ones you need? Sure, they’re inexpensive to purchase and not exactly uncommon. But 
![image](https://hackaday.com/wp-content/uploads/2025/12/FP81TD4MJ0EE14N_c7c900-e1765855294739.jpg?w=800")
alt=""/>Visualizers used to be very much in vogue, something you’d gasp in at amazement when you’d fire up Winamp or Windows Media Player. They’re largely absent from our modern lives, 
![image](https://hackaday.com/wp-content/uploads/2025/12/The-Motorisation-of-Dalek-Bob-0-11-screenshot-banner.png?w=800")
alt=""/>Not every impulsive purchase on eBay leads to possession of a wooden Dalek, but when a friend did exactly that, [Tony Goacher] did his part to turn ‘Dalek Bob’ into 
![image](https://hackaday.com/wp-content/uploads/2025/10/overview_twa_non-equilibrium_qed_system.png?w=800")
alt=""/>Physics simulations using classical mechanics is something that’s fairly easily done on regular consumer hardware, with real-time approximations a common feature in video games. Moving things to the quantum realm 
![image](https://hackaday.com/wp-content/uploads/2025/12/portable_air_conditioning_hyperspace_pirate_youtube.jpg?w=800")
alt=""/>When you think of air conditioners, you tend to think of rather bulky units, with the window-mounted appliances probably among the most compact. There’s however no real minimum size limit 
![image](https://hackaday.com/wp-content/uploads/2025/12/Composite-video-test-pattern-generator-1.png?w=800")
alt=""/>[Nicholas Murray]’s Composite Test Pattern Generator is a beautifully-made, palm-sized tool that uses an ESP32-based development board to output different test patterns in PAL/NTSC. If one is checking out old 
![image](https://hackaday.com/wp-content/uploads/2025/12/ibm_promo_video_optical_character_recognition_1960s_periscopefilm_youtube.jpg?w=800")
alt=""/>Optical Character Recognition (OCR) forms the bridge between the analog world of paper and the world of machines. The modern-day expectation is that when we point a smartphone camera at 
![image](https://hackaday.com/wp-content/uploads/2016/05/microphone.jpg?w=800")
alt=""/>This week the Hackaday Podcast is on vacation, but we’d like to wish you all happy holidays and a great 2026. Thanks for tuning in! We’ll be back next week. 
![image](https://hackaday.com/wp-content/uploads/2025/12/I-3D-Printed-This-PC-Case-Instead-Of-Buying-One-12-34-screenshot.png?w=800")
alt=""/>There are all kinds of fun, glowing PC cases on the market these days. However, if you want something that focuses on serviceability over flash while still looking stylish, you 
![image](https://hackaday.com/wp-content/uploads/2022/05/nvidia_driver.png?w=800")
alt=""/>It’s no surprise that NVIDIA is gradually dropping support for older videocards, with the Pascal (GTX 10xx) GPUs most recently getting axed. What’s more surprising is the terrible way that 
![image](https://hackaday.com/wp-content/uploads/2025/12/distroplate-cast-feat.jpg?w=800")
alt=""/>Names and labels are difficult. Take this “3D Printed” water-cooling loop by [Visual Thinker] on YouTube. It undeniably uses 3D printing — but it also uses silicone casting and laser-cut 
![image](https://hackaday.com/wp-content/uploads/2025/12/I-Built-a-Cookie-Launcher-0-5-screenshot.png?w=800")
alt=""/>Holiday cookies are a joy, and to make things a bit more fun, [The Skjegg] created the Cookie Launcher. At the touch of a button, a door opens and the 
![image](https://hackaday.com/wp-content/uploads/2025/12/starfield-featured.jpg?w=800")
alt=""/>Perhaps the most beautiful aspect of mathematics is that it applies to literally everything, even things that do not exist in this Universe. In addition to this there are a 
![image](https://hackaday.com/wp-content/uploads/2025/12/rocket.png?w=800")
alt=""/>Facebook Marketplace provides you with a free grain silo, so what do you do with it? If you are [saveifforparts], you mix it with other materials and produce a retro-style 
![image](https://hackaday.com/wp-content/uploads/2025/12/fibreseeker_3_vs_chopped_cf_fdm_my_tech_fun_youtube.jpg?w=800")
alt=""/>Although you can purchase many types of FDM filaments containing ‘carbon fiber’ these days, they are in no way related to the carbon fiber (CF) composite materials used for rocket 
![image](https://hackaday.com/wp-content/uploads/2025/12/I-Built-An-On-Call-Pager-_-ESP32-1-13-screenshot.png?w=800")
alt=""/>Pagers were once a great way to get a message to someone out in public; they just had to be cool enough to have one. These days, they’re mostly the 