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A New Way to Make (Almost) Holograms with Lasers
https://invidious.privacyredirect.com/watch?v=RsGHr7dXLuI
The spectrum of laser technologies available to hackers has gradually widened from basic gas lasers through CO2 tubes, diode lasers, and now fiber lasers. One of the newer entries is the MOPA laser, which combines a laser diode with a fiber-based light amplifier. The diode’s pulse length and repetition rate are easy to control, while the fiber amplifier gives it enough power to do interesting things – including, as [Ben Krasnow] found, etch hologram-like diffraction gratings onto stainless steel.
Stainless steel works because it forms a thin oxide layer when heated, with a thickness determined by the temperature it reaches. The...
Radio Astronomy in the Palm of Your Hand
https://invidious.privacyredirect.com/watch?v=IbHRXGjD830
When you think of a radio telescope, you usually think of a giant dish antenna pointing skyward. But [vhuvanmakes] built Wavy-Scope, a handheld radio telescope that can find the Sun and the Moon, among other things.
The build is relatively straightforward, using a commercial LNB to detect signals in the 10-12 GHz range. The detector is a simple satellite finder, although you could also connect it to a software-defined radio, if you wanted something more sophisticated.
The sci-fi style unit is 3D printed, of course, and made us think of a 1950s-era ray gun. There are several videos of the device in...
F/0.38 Camera Lens Made With Oil Immersion Microscope Objective
https://invidious.privacyredirect.com/watch?v=DQv0nlGsW-s
Over on YouTube [Applied Science] shows us how to make an f/0.38 camera lens using an oil immersion microscope objective.
The f-number of a lens indicates how well it will perform in low-light. To calculate the f-number you divide the focal length by the diameter of the aperture. A common f-number is f/1.4 which is generally considered “fast”.
We are told the fastest commercial lens ever used had f/0.7 and was used by Stanley Kubrick to shoot the film Barry Lyndon which was recorded only with candle light.
A microscope objective is a crucial lens that gathers and magnifies light to form an...
2025 Component Abuse Challenge: Boosting Voltage With Just a Wire
Switching power supplies are familiar to Hackaday readers, whether they have a fairly conventional transformer, are a buck, a boost, or a flyback design. There’s nearly always an inductor involved, whose rapid change in magnetic flux is harnessed to do voltage magic. [Craig D] has made a switching voltage booster that doesn’t use an inductor, instead it’s using a length of conductor, and no, it’s not using the inductance of that conductor as a store of magnetic flux.
Instead it’s making clever use of reflected short pulses in a transmission line for its operation. Electronics students learn all about this in...
Hackaday Podcast Episode 342: Poopless Prints, Radio in Your Fillings, and One Hyperspectral Pixel at a Time
It was Elliot and Dan on the podcast today, taking a look at the best the week had to offer in terms of your hacks. We started with surprising news about the rapidly approaching Supercon keynote; no spoilers, but Star Trek fans such as we who don’t have tickets will be greatly disappointed.
Elliot waxed on about taking the poop out of your prints (not pants), Dan got into a camera that adds a dimension to its images, and we both delighted in the inner workings of an air-powered squishy robot.
Questions? We’ve got plenty. Is it possible to take an X-ray...
DIY Telescope Uses Maker Tools
You’ve got a laser cutter. You’ve got a 3D printer. What do you make? [Ayushmaan45] suggests a telescope. The modest instrument isn’t going to do serious astronomy with only 8X worth of optics, but it would make a fine spyglass for a youngster.
The body is cut from MDF, and there are only a few 3D printed parts. The only other things you need are rubber bands and a pair of lenses. You don’t even need glue. We might have spray painted the inside of the scope black or used some black contact paper to cut down on reflections, although it...
Allwinner T153-based industrial SoM and SBC feature a mix of Arm Cortex-A7 and RISC-V cores
Forlinx has recently introduced the Allwinner T153-based FET153-S SoM and the OK153-S SBC. The Allwinner T153 processor features a hybrid architecture that combines a quad-core Arm Cortex-A7 CPU with an XuanTie E907 RISC-V core. The board features up to 1GB DDR3 RAM, 8GB eMMC, triple Gigabit Ethernet, dual CAN-FD, RS-485, and a Local Bus for PSRAM or FPGA expansion. Display options include support for RGB, LVDS, and MIPI DSI interfaces, and camera inputs are offered via parallel or MIPI CSI. Additional I/O include multiple UART, I²C, SPI, I²S, GPADC, and GPIO options, along with Wi-Fi/Bluetooth, a USB Type-C OTG port,...
This Week in Security: F5, SonicWall, and the End of Windows 10
https://invidious.privacyredirect.com/watch?v=U1VKazuvGrc
F5 is unintentionally dabbling in releasing the source code behind their BIG-IP networking gear, announcing this week that an unknown threat actor had access to their internal vulnerability and code tracking systems. This security breach was discovered on August 9th, and in the time since, F5 has engaged with CrowdStrike, Mandiant, and NCC Group to review what happened.
So far it appears that the worst result is access to unreleased vulnerabilities in the F5 knowledge management system. This means that any unpatched vulnerabilities were effectively 0-days, though the latest set of patches for the BIG-IP system has fixed those flaws. There...
Memoria – Fragility of human connections
Memoria is an experimental photo album application that visualizes the fading of human connections: as the shared moments decrease, the people in the photo album gradually disappear.
Important Notice: This RSS Feed is being retired and will soon stop working. Switch to our Feed+ and get full content posts, jobs, events, and books via RSS. ...Водородные печи в электровакуумном производстве. Что, зачем, какие
Специальные печи для высокотемпературной термообработки в контролируемой газовой среде и, в частности, в водороде, с успехом применяют при производстве особо ответственных деталей в ряде областей. Отжиг металлов в Н2 улучшает их микроструктуру, повышает однородность. В водородных печах прямым способом получают железо, спекают порошковые металлы, делают высококачественную пайку. Водородный отжиг очень способствует удалению впитанных металлами газов (обезгаживание). Последнее — крайне важный процесс в, так нас интересующем, производстве электровакуумных приборов (ЭВП), где отжиг в Н2 — стандартная мера ускорения и удешевления изготовления приёмно-усилительных ламп (ПУЛ). Печи для отжига в водороде могут быть как крупными заводскими установками, так и упрощёнными лабораторными мини и даже микровариантами,...