Kritik sah

Before the past year, many of us took computer memory for granted. It was one of the lower-cost parts of a PC build and was usually available in whatever quantity one desired. As its cost has skyrocketed, a lot of PC builders and other users of computers in general are taking a deeper look at memory, how much is really needed, and what its functions truly are. [Igor] is working on a drum sequencer project which needs a small amount of memory, and has built this dynamic RAM from discrete components. The first video goes into the construction of the memory array and how its addressed. It’s only eight bytes total, and using fairly large electrolytic capacitors to store data means that a gigabyte of this memory would take up well over a thousand acres, but it’s still enough memory for [Igor]’s needs. In addition to the capacitor, each bit uses a pair of diodes to determine if a read or write is occuring, and a set of transistors on the read and write busses to perform th...

While there is a time and place for wirelessly controlled devices, sometimes you want something you can just reach out and touch to interact with, no apps to install or devices to configure. In this case [John] wanted a lamp that was just that. Drawing inspiration from the rotary phone, he created the LightComposer . This small lamp, just a bit smaller than a hockey puck, uses a 3D printed enclosure and a straightforward PCB. It’s a very accessible project to recreate. The 3D prints are well thought out including a TPU ring on the bottom to keep the lamp from sliding around. The light source comes from 32 SK6812 LEDs, which are very similar to NeoPixels. An ATmega328P microcontroller powers the project and can easily be programmed using the Arduino IDE. A rotary encoder in the center, coupled to the top diffuser, lets you control LED brightness and color by turning it. The firmware also includes some fun hidden light-effect modes. Head over to [John]’s site for all the files needed ...

After recently publishing a few videos covering research into the poor adhesion between chopped carbon fiber (CCF) and the thermoplastic filaments as used with FDM 3D printing, some of the feedback received by [I built a thing] included the idea that the missing step to make CCF additives work was post-print annealing. Naturally this claim had to be investigated , both through the resulting physical characteristics as well as on a microscopic level in the same scanning electron microscope (SEM) as before. Post-annealing SEM scan, showing clear voids. (Credit: I built a thing, Youtube) Theories as to why annealing the parts would help here seem to focus on increased bonding and filling of voids in the printed CCF-infused material, while there are the typical worries with annealing such as parts warping and shrinking to also take into account as potential downsides of this treatment. For the sample materials PETG and PETG-CF, as well as PLA and PLA-CF filaments are used, with each fil...

Usually the term ‘jailbreaking’ isn’t meant to be taken quite that literally, but in the case of the US prison tablet that [Hugh Jeffreys] got sent, it’s really quite apt. Unlike the typical transparent prison electronics, this tablet is hermetically sealed inside an opaque plastic case, with the Windows 10 install firmly locked-down and not allowing anything more to be done with it than access some prison-provided services via the browser in kiosk mode. The first challenge was to see whether it could be booted at all, with just four metal pads visible on the side of the case. These turn out to correspond to USB pins, but the tablet only briefly tries to turn on with a charger connected. This means that a teardown is required, which ended up involving a hacksaw due to the sealed case. Inside the case is the Windows tablet with the back cover removed, presumably for easy access to extend its USB port. All of this is embedded in foam and more gunk that makes dis...

The British government is in a headlong rush to ban under-16s from social media, and restrict the access of under-18s. And in typical form, the EFF is here with a warning about the dangers and futility of such legislation . Kids aren’t stupid. They’ll use a fake ID like this one from the satirical https://use-their-id.com/ . Or they’ll become VPN experts. The proposed new law will involve an age restriction policed through online ID verification, something which will not be limited to the young, as every British adult will also have to show ID to access large parts of the Internet. There is little in the way of information about how this unprecedented invasion of privacy will be implemented, however we expect that it will be left to the lax security measures of a range of lowest-bidder third party identity verification services. The resulting database will become a very rich target indeed. The EFF pull no punches in warning of the harms these measures will bring u...

There are as almost as many kinds of coffee as there are of coffee drinkers, with each method for preparing the beverage appealing to a different kind of palate: moka pots, filter coffee, pour-over coffee, French presses, cold brews, espresso, and more produce their own unique flavours by extracting different compounds from the grounds to different degrees. Now, a new method has joined the throng: ultrasonic-assisted extraction, which can produce even an espresso at room temperature. Espresso is normally made by forcing hot water through tightly-packed, finely-ground coffee beans, quickly producing a concentrated extraction. Its one of the hardest kinds of coffee to consistently make well, since the outcome is influenced by everything from grind size and packing density to temperature, pressure, and more. Ultrasonic agitation helps here by creating cavitation bubbles, which form shock waves as they collapse, breaking open the bean structure and producing small, strong jets of water....

Today marks the summer solstice, the longest day of the year and the start of astronomical summer in the Northern Hemisphere. This doesn’t really have much to do with hacking hardware or building gadgets other than the fact that from this point on you’ll have progressively less daylight hours to do it in each day. Of course, if you do your best work in the middle of the night this won’t impact things much. If you’re as likely to find a controller in your hand as a soldering iron in the evenings, you might be interested in a recent filing against Sony . Lawyers representing a group of four gamers allege that the entertainment giant is violating a California law that says digital storefronts need to make it clear that buyers don’t technically own the games in question but are merely licensing them — a license which, as we’ve seen in the past, can be revoked or modified at any time with no restitution made to the purchaser. Now while we agree con...

So you have a project that you love, and everyone else loves too. People start saying “you should sell this” but where? Well, there’s a new marketplace you might want to consider called called SmallRun , aiming at makers and their, well, small production runs. SmallRun will absolutely host your custom PCBs, on-demand 3D prints, and other traditional maker products — but they’ll also happily sell your merch, too. Along with electronics and hardware, they aim to allow you to sell products in categories like tabletop gaming, sciences, and yes, accessories/apparel. For sellers, they offer automatic payouts and promise to take care of the taxes by integrating with Stripe. That said, they’re still working on getting the whole VAT thing set up for products imported to the EU. EU to EU sales are apparently OK. They’ll host build logs, which may drive engagement with your product. There’s even a handy tool to import your existing listings from eB...

The Bernoulli disk was a wild piece of 1980s hardware. Take a big floppy. Spin the platter at 1500 RPM just a micron or so from a read head. The airflow around that rapidly-spinning disk actually stabilizes the disk that close to the read-head via the Bernoulli effect, hence the name. Once upon a time, everybody wanted a Bernoulli Box to put under their Macintosh 512, but [Will It Work?] wanted to see how well these old drives held up to the 21st century… by using it to load games onto a WiiU.  It’s not as crazy at is it seems. The WiiU is happy to read and write anything that looks like a USB mass storage device. The Bernoulli Box is of course pre-USB– even the later model 5 1/4″ drive [Will] is using from 1987. That means it uses SCSI, the USB of the 1980s . He’s got a 90 MB disk, though IOmega did make disks of higher capacity in that format, all the way up to 230 MB. Yes, the same iOmega of Zip-drive fame and infamy — but don’t worry, the p...

With the advent of affordable 2.5 Gbit, 5 Gbit, and 10 Gbit consumer networking gear, more and more people are taking advantage of these higher networking speeds, with [This Does Not Compute] having used 10 Gbit SFP+ modules over regular Cat-5e copper to connect to a NAS in the next room. Only problem was that after a while these SFP+ modules began to start dropping frames. On taking a closer look at these modules, he found that they were running pretty hot: 40°C while idle. A teardown of one of these modules showed severe discoloration due to heat. Side view of the SFP+ module’s PCB. (Credit: This Does Not Compute, YouTube) Inside these 10Gbit modules is the Marvell-branded Alaska X 88X3310/40P PHY, which despite the ‘low-power’ claims have a metal heatsink glued onto the actual IC and thermally coupled to the module’s metal enclosure. The other side of the PCB was quite discolored, further indicating how hot these modules run in operation. Some digging revea...

One of the stun gun modules with battery pack. (Credit: Dani Cruster DiWHY, YouTube) Few things are more satisfying during a Summer night than hearing the crackle and pop of another mosquito hurling itself against a bug zapper and knowing that it won’t be trying to suck your blood any more. The only problem with those bug zappers, whether the mounted or hand-held type is that you cannot get every single attacking mosquito. Unless you were to put the bug zapper on yourself, of course. This is basically what [Dani Cruster] of the aptly named ‘DiWHY’ channel decided would be the right course of action . The video is apparently dubbed over from the original Russian – with the team claimed to be based in Moldova – which probably explains a lot of the reasoning behind this engineering. At the core of the whole-body bug zapper is galvanized mesh, with a big question being how close you can get it to the body before said body gets zapped too. With about a millime...

Although the basic principle of radio direction finding is easy to understand (measure the phase difference between different antennas, then calculate the angle of arrival from this difference), the radio hardware to actually implement this has historically been hard for hackers to access. The QuadRF project aims to change this by building a phase-coherent four-channel SDR which makes direction mapping easy ( GitHub repository ). The QuadRF uses two boards: one to receive and pre-process radio waves, and a Raspberry Pi 5 for additional processing. The RF board has four patch antennas, each capable of either transmitting or receiving in the 4.9 GHz to 6.0 GHz range, with switchable right- or left-hand polarization. For on-device processing, it uses a Lattice ECP5 FPGA, which uses two MIPI cables to connect to the camera and display interfaces on the Raspberry Pi. These form a very high-speed data exchange, and after further processing, the Pi can pass data on over Ethernet or Wi-Fi. ...

How fast can you count to a million? It would probably take you a while. A computer could certainly do it faster. Indeed, the The National Museum of Computing figured it could actually prove to be a simple but useful benchmark for comparing computers over many eras and architectures. Thus was born the Million Measure . The intention was to develop a benchmark that could run on just about anything considered a “computer.” As explained in a recent talk, the Million Measure can be run quite simply on anything from an ancient World War II computer like Colossus, to a modern Raspberry Pi. There are no complicated algorithms that need optimization, nor architecture-specific code required to do the job. The museum also found it to be a useful way to figure out which computers in their collection were actually working at any given time. Early computers from the mid-20th century reported benchmark times in minutes, while a 1995 BeBox is the fastest machine tested so far at 0.004 sec...

One of the most hilarious things you can do with an LLM-based chatbot is to ask it to do calculations. If it’s a well-written chatbot frontend, it can detect requests for arithmetic – like summing 1 and 1 – and pass it on to a dedicated calculator application, even if still cannot correctly count the ‘r’s in ‘strawberry’. This is where [Alvaro Videla] asks the question whether it is at all possible to perform arithmetic with a language model. Since an LLM at its core is nothing but a vector space of probabilities that a matrix-based inference process uses to create a probabilistic output of tokens you’d not expect a lot of deterministic behavior. How can you do arithmetic without grounding it in some kind of deterministic process? This is where [Alvaro]’s Rune project comes into play, which is ‘a mechanism-aware JIT compilation project for language-model arithmetic’. Although it is statistically impossible for an LLM ...

The Epson HX-20 is sometimes referred to as an early laptop computer. It’s a little odd in its form factor, and in its storage, relying on a microcassette drive to store data. It can be problematic to keep these tapes and drives going after so many decades, so [Andrew Menadue] has been tinkering with a more modern solution . The replacement drive uses a Raspberry Pi Pico to emulate the original tape drive. The Pico uses a microSD card to store data instead of the magnetic media of old. The device has a small screen for showing status information and four buttons for navigation, allowing the faux drive to be controlled as to what “tape” it’s pretending to be. It’s also possible to use the device to emulate ROM cartridges that could be used with the HX-20 in place of its original tape deck storage solution. We’ve seen some other old hardware get similar drive upgrades before, too . No surprise, because mechanical drives and media simply don’t la...

It’s never been easier to get a printed circuit board made. In fact, almost every electronics video out on the internet will incessantly remind you of this fact now. But making a custom PCB wasn’t always as straightforward as sending a KiCad file to a board house. Many DIY methods involve harsh chemicals and tedious processes, but did have the potential benefit of taking much less time than waiting on boards to arrive in the mail. [Bettina Neumryr] is demonstrating one of these older methods , called the toner transfer method, using a circuit that was printed directly in an old magazine. The first part of the toner transfer method is to create an image that can be printed. Since this circuit came from a magazine, it is first scanned in to a computer and imported into GIMP, where it can be scaled to match the size of the components and then sharpened to make a crisp print. With the image ready, it’s time to print the image onto some toner transfer paper, ensuring that ...

Generally the idea with photopolymers as used with resin 3D printing is that the process only works in a single direction as with all thermosets: after polymerization under influence of UV light they become an inert lump of plastic. Being able to turn these lumps back into resin would of course be ideal, as it would make recycling incredibly easy. Here depolymerizable resin turns out to be a thing, with 3Dresyn being one company that sells additives and resin which enable this (found via Fabbaloo ). Irreversible (thermoset), partial and full depolymerization. (Credit: Machado et al. , Nature, 2024) These additives and resins come in essentially two flavors based on which temperature they depolymerize at, which can be at either 80°C or 150°C. This comes at a cost, of course, with the ready-to-use resin coming in at an eyewatering €833.00 for a 1 kg bottle, a factor only slightly helped by the reusability aspect. From a more technical perspective this depolymerization feature is fas...

There are a million and one cheap OLED display modules out there. Only, the problem is, they’re all assembled on bare PCBs and they’re all slightly different, and that frustrates efforts to mount them in a clean and tidy manner. [Galopago] decided to build a small OLED module that solved this frustrating problem. The idea to pursue this came from off-the-shelf panel displays commonly used for power supply builds and other such equipment. These come in relatively standard sizes and are designed from the outset to slot neatly into a panel with a bezel that covers any ugly edges or awkward gaps. The build began with a 48 x 29mm enclosure grabbed from an off-the-shelf power panel meter. There are two PCBs—one holding the regulator and other equipment to run the display, the other carrying a set of screw terminals that make it easy to wire up the display to a piece of equipment. The SSD1306-copmatible OLED screen itself connects to the first board with a flat flex cable, as is ...

Do you have a ZKETECH EBC-A20 battery tester? Perhaps you don’t like the default software used to control the device. In that case, you might like the alternative whipped up by [Kazhuu.] A reverse-engineering effort targeted at the EBC-A20 served as the basis for the work. The battery tester is ultimately controlled by a simple serial interface, running at 9600 bps, 8 bits, with odd parity. Armed with a relatively complete understanding of the commands used to control the device, [Kazhuu] was able to whip up a simple web app to control the device instead, using WebUSB to access the device over a USB-to-serial converter, though a desktop version for Linux and Windows is also available. If you’ve got one of these battery testers sitting on your bench, using the app is as simple as pointing your browser here with the device plugged in via USB. Then you can run basic load tests on battery cells and graph the results right on your computer without having to deal with the propr...

Holographic displays sound very fancy but you can build various simple types yourself at home. [Julius Makes] whipped up a neat design that shows a different image depending on the position from which you view it.  Running the show is a Wemos D1 devboard equipped with the ESP8266 microcontroller. It’s hooked up to a pair of OLED displays over I2C. The displays are placed in a 3D printed assembly that aims each one at a beam-splitter cube. This bounces light projected into one face through 90 degrees, and out another face. By leveraging this, it’s possible to aim each display at one face and bounce it out another, such that looking at either side of the beamsplitter cube shows a different image. Since the beamsplitter cube also allows some light to be transmitted directly through as well, the image from each display appears to float in space. [Julius] notes that this setup is being used in a puzzle box game, while wondering whether there’s any other fun ways to levera...

There always seem to be a handful of revolutionary technologies perpetually out of reach: fusion energy, quantum computers, and full self-driving cars are always in this list, and it seems like there’s also some battery technology which will finally let us fully decouple from fossil fuels in there as well. Although lithium batteries have allowed some ground-based electric transportation, the energy density is still not enough to enable full electrification, especially for things like aircraft. Solid state batteries may be on the verge of changing some of this, though, and a team has recently put them to work in a test aircraft to help make some headway with this novel battery chemistry . The main contributing factor of these batteries’ improved energy densities is the ability to use a solid lithium anode, which has much higher energy density than the graphite-based anodes in modern liquid electrolyte batteries. Solid state batteries also have improved safety, since the sol...