Author: Jenny List

3035 Articles

Ask Hackaday: Has Firefox Finally Gone Too Far?

July 14, 2024 by 119 Comments

In a world where so much of our lives depend on the use of online services, the web browser used to access those services becomes of crucial importance. It becomes a question of whether we trust the huge corporate interests which control this software with such access to our daily lives, and it is vital that the browser world remains a playing field with many players in the game.

The mantle has traditionally fallen upon Mozilla’s Firefox browser to represent freedom from corporate ownership, but over the last couple of years even they have edged away from their open source ethos and morphed into an advertising company that happens to have a browser. We’re asking you: can we still trust Mozilla’s Firefox, when the latest version turns on ad measurement by default?

Such has been the dominance of Google’s Chromium in the browser world, that it becomes difficult to find alternatives which aren’t based on it. We can see the attraction for developers, instead of pursuing the extremely hard task of developing a new browser engine, just use one off-the-shelf upon which someone else has already done the work. As a result, once you have discounted browsers such as the venerable Netsurf or Dillo which are cool as heck but relatively useless for modern websites, the choices quickly descend into the esoteric. There are Ladybird and Servo which are both promising but still too rough around the edges for everyday use, so what’s left? Probably LibreWolf represents the best option, a version of Firefox with a focus on privacy and security.

We’re interested in your views on this topic, because we know you’ll have a lot to say about it. Meanwhile if you’re a Firefox user who’s upgraded to version 128 and you’re not sure what to do, don’t panic. Find the settings page, go to “Privacy and Security”, and un-check the “Website Advertising Preferences” checkbox.

The NSA Is Defeated By A 1950s Tape Recorder. Can You Help Them?

July 13, 2024 by 59 Comments

One of the towering figures in the evolution of computer science was Grace Hopper, an American mathematician, academic, and Naval reservist, whose work gave us the first programming languages, compilers, and much more. Sadly she passed away in 1992, so her wisdom hasn’t directly informed the Internet Age in the manner of some of her surviving contemporaries.

During her life she gave many lectures though, and as [Michael Ravnitzky] discovered, one of them was recorded on video tape and resides in the archives of America’s National Security Agency. With the title “Future Possibilities: Data, Hardware, Software, and People”, it was the subject of a Freedom Of Information request. This in turn was denied, on the grounds that “Without being able to view the tapes, NSA has no way to verify their responsiveness”. In short, the recording lies on Ampex 1″ reel-to-reel video tape, which the NSA claims no longer to be able to read.

It’s fairly obvious from that response that the agency has no desire to oblige, and we’d be very surprised to find that they keep a working Ampex video system to hand on the off-chance that a passing researcher might ask for an archive tape. But at the same time it’s also obvious that a lecture from Rear Admiral Hopper is an artifact of international importance that should be preserved and available for study. It’s an interesting thought exercise to guess how many phone calls Hackaday would have to make to secure access to a working Ampex video recorder, and since we think for us that number would be surprisingly low it’s likely the NSA know exactly who to call if they needed that tape viewed in a hurry. We don’t have influence over secretive government agencies, but if we did we’d be calling shame on them at this point.

If you’re curious about Grace Hopper, we’ve talked about her work here in the past.

Thanks [F4GRX] for the tip.

Ampex image: Telecineguy., Public domain.

Samsung Killed The Online Service, This 20 Dollar Dongle Brings It Back

July 9, 2024 by 14 Comments

Around 2010 or so, Samsung cameras came with an online service: Social Network Services. It enabled pictures to be unloaded wirelessly to social media with minimum hassle, which back then wasn’t quite as easily accomplished as it is today. Sadly they shuttered the service in 2021, leaving that generation of cameras, like so many connected devices, orphaned. Now along comes [Ge0rG] with a replacement, replicating the API on a $20 LTE dongle.

The dongle in question is one we featured a couple of years ago, packing a Linux-capable computer of similar power to a Raspberry Pi Zero alongside its cell modem. The camera can connect to the device, and a photo can be sent in a Mastodon post. It’s something of a modern version of the original, but for owners of the affected cameras it’s a useful recovery of a lost service.

It’s surprising in a way that we’ve not heard of more hacks using these dongles, as they do represent a useful opportunity. That we haven’t should be seen as a measure of the success of the Raspberry Pi and other boards like it, just as it’s no longer worth hacking old routers for Linux hardware projects, so there’s less of a need to do the same here.

British Trains To (Maybe) Make Way For Steam Once More

July 6, 2024 by 72 Comments

There’s nothing more guaranteed to excite a grizzled old railway enthusiast than the sight of a steam locomotive. The original main-line rail propulsion technology still clings on in a few places, but for practical purposes, it disappeared a lifetime ago. It’s interesting then to hear of a brand new steam locomotive prototype being considered for revenue freight use on British metals. Is it yet another rebuild of a heritage design to be used for enthusiasts only? No, it’s an entirely new design with nothing in common with the locomotives of the past, as [Terrier55Stepney] tells us in the video below the break.

Gone is the huge boiler and reciprocating pistons of old, as indeed is the notion of boiling anything. Instead, this is a steam turbine, nothing like the 1920s and 30s experiments with conventional locomotives, nor even the Union Pacific’s oil-fired condensing turbo-electrics. The new idea here from the British company Steamology is to create steam directly from the combustion of hydrogen in a series of small modular steam generators, and the resulting prototype turbo-generator will replace the diesel engine in a redundant British Rail class 60 freight locomotive. It’s unclear whether it will incorporate a condenser, but since it has no need to retain the water for a boiler we’re not sure it would need one.

Prototype locomotives featuring new technologies have a long and inglorious history of not making the grade, so while this is definitely an exciting and interesting development we’re not guaranteed to see it in widespread use. But it could offer a way to ensure a low-carbon replacement for diesel heavy freight locomotives, and unexpectedly provide engine upgrades for existing classes. The fact it’s technically a steam locomotive is incidental.

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The Thermite Process Iron Foundry

July 5, 2024 by 14 Comments

The thermite process is a handy way to generate molten iron in the field. It’s the reaction between aluminium metal and iron oxide, which results in aluminium oxide and metallic iron. It’s hot enough that the iron is produced as a liquid, which means it’s most notably used for in-field welding of things such as railway tracks. All this is grist to [Cody’s Lab]’s mill of course, so in the video below the break he attempts to use a thermite reaction in a rough-and-ready foundry, to make a cast-iron frying pan.

Most of the video deals with the construction of the reaction vessel and the mold, for which he makes his own sodium silicate and cures it with carbon dioxide. The thermite mix itself comes from aluminium foil and black iron oxide sand, plus some crushed up drinks cans for good measure.

The result is pretty successful at making a respectable quantity of iron, and his pour goes well enough to make a recognizable frying pan. It has a few bubbles and a slight leak, but it’s good enough to cook an egg. We’re sure his next try will be better. Meanwhile this may produce a purer result, but it’s by no means the only way to produce molten iron on a small scale.

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How To Turn Cheap Speakers Into Something A Little Better

July 5, 2024 by 25 Comments

[Adam Francis] bought some cheap speaker drivers from AliExpress. Are they any good? Difficult to tell without a set of enclosures for them, so he made a set of transmission line cabinets. The resulting video proves that a decent sounding set of speakers shouldn’t have to cost the earth, and is quite entertaining to watch.

The design he’s going for is a transmission line, in effect a folded half-wave resonant tube terminated at one end and open at the other, with the speaker close to half way along. There is a lot of nuance to perfecting a speaker cabinet, but this basic recipe doesn’t have to be optimum to give a good result.

So after having some MDF cut to shape and glueing it all together, he ends up with some semi decent speakers for not a lot of money. The video is entertaining, with plenty of Britishisms, but the underlying project is sound. We’d have a pair on our bench.

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Cavity Filters, The Black Art You Have A Chance Of Pursuing

July 4, 2024 by 12 Comments

A tuned circuit formed by a capacitor and an inductor is a familiar enough circuit, and it’s understood that it will resonate at a particular frequency. As that frequency increases, so the size of the capacitor and inductor decrease, and there comes a point at which they can become the characteristic capacitance and inductance of a transmission line. These tuned circuits can be placed in an enclosure, at which they can be designed for an extremely high Q factor, a measure of quality, and thus a very narrow resonant point. They are frequently used as filters for that reason, and [Fesz] is here with a video explaining some of their operation and configurations.

Some of the mathematics behind RF design can be enough to faze any engineer, but he manages to steer a path away from that rabbit hole and explain cavity filters in a way that’s very accessible. We learn how to look at tuned circuits as transmission lines, and the properties of the various different coupling methods. Above all it reveals that making tuned cavities is within reach.

They’re a little rare these days, but there was a time when almost every TV set contained a set of these cavities which were ready-made for experimentation.

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