Retrotechtacular: Clay Pipe The Hard Way

Troll YouTube long enough and chances are good that you’ll come across all kinds of videos of the “How It’s Made” genre. And buried in with the frying pans and treadmills and dental floss manufacturers, there no doubt will be deep dives on how pipe is made. Methods will vary by material, but copper, PVC, cast iron, or even concrete, what the pipe factories will all have in common is the high degree of automation they employ. With a commodity item like pipe, it’s hard to differentiate yourself from another manufacturer on features, so price is about the only way to compete. That means cutting costs to the bone, and that means getting rid of as many employees as possible.

Such was not always the case, of course, as this look at how Irish Stoneware & Fireclays Ltd. made clay pipe, drain tiles, and chimney flues back in the 1980s shows. The amount of handwork involved in making a single, simple piece of clay pipe is astonishing, as is the number of hands employed at the various tasks. The factory was located in Carrickmacross, County Monaghan, Ireland, near an outcropping of shale that forms the raw material for its products. Quarrying the shale and milling it into clay were among the few mechanized steps in the process; although the extrusion of the pipe itself was also mechanized, the machines required teams of workers to load and unload them.

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Hackaday Links: May 29, 2022

It looks like the ongoing semiconductor shortage isn’t getting any better, and if the recent spate of computer thefts from semi trucks is any indication, it’s only going to get worse. Thieves seem to be targeting the Freightliner Cascadia, probably the most popular heavy freight truck on the road in North America today, with “smash and grab” thefts targeting the CPC4, or Common Powertrain Control module. These modules are sitting ducks — they’re easy to locate and remove, the chip shortage has made legit modules nearly unobtanium from dealers, and the truck won’t run without them. That’s driven the black market price for a CPC up to $8,000 or more, making them a tempting target. And it’s not only individual trucks parked in truck stop lots that are being hit; gangs are breaking into trucking company lots and bricking dozens of trucks in short order. So the supply chain problem which started the semiconductor shortage caused the module shortage, which drives the thieves to steal modules and take trucks off the road, which only worsens the supply chain shortage that started the whole thing. Nice positive feedback loop.

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Relax And Enjoy This Simple Drone Synthesizer

You’d think that a synthesizer that makes as much noise and sports as many knobs as this one would have more than a dozen transistors on board. Surely the circuit behind the panel is complex, and there must be at least a couple of 555 timers back there, right?

But no, the “Box of Beezz” that [lonesoulsurfer] came up with is remarkably simple. It takes inspiration from a [Look Mum No Computer] circuit called the “Circle Drone of Doom,” which used six switchable relaxation oscillators to make some pretty cool sounds. The Box of Beezz steps that up a bit, with four oscillators in three switchable banks in the final version. Each oscillator has but one transistor with a floating base connection and a simple RC network on the collector. The sawtooth outputs of these relaxation oscillators can be adjusted and summed together, resulting in some surprisingly complex sounds. Check out the video below for a bit of the synth’s repertoire — we’d swear that there are points where we can hear elements of the THX Deep Note in there.

We poked around a bit to understand these oscillators, and it looks like these qualify as avalanche relaxation oscillators. [lonesolesurfer]’s notes indicate that SS9018 transistors should be used, but in the photos they appear to all be 2N4401s. We’re not sure how long the transistors will last operating in the avalanche mode, but if they quit, maybe some neon tubes would work instead.

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Upcycled Practice Amp Build Goes To Eleven

What do you call someone who gives the toddler in your life a musical instrument as a gift? In most cases, “mortal enemy” is the correct answer, but not everyone feels quite so curmudgeonly, and might even attempt to turn up the volume a bit. Such is the case with this wonderfully detailed practice amp for the grandkids’ electric ukelele.

The aptly named [packrat] [Professor Mayhem] really made this build a tour de force of scrap bin sourcing. The amp is built around a module salvaged from an old TV, a stereo Class-D amp that was modified to provide 30 watts output and a volume control. The driver came from a flood-damaged speaker unit, and the power supply from a gutted wall wart. The case was built with scrap plywood and covered with pebble-grain fabric to give it that pro audio look, while the chassis for the electronics was bent from a piece of sheet steel.

But it’s the tiny details that really sell this project. Everything from the pilot light to the pointer knob screams 1970s, as do the painstaking front panel lettering and vinyl “Monkeydyne” logo. [Professor Mayhem] even went the extra mile to create an etched-brass serial number plate, a mock specs and safety label, and even a QA inspection tag that was (sort of) stapled inside the cabinet.

We tip our hats to [Professor Mayhem] for this four-month labor of love and obvious nostalgia trip, which the kids are sure to love. [Professor Mayhem] does admit that some will argue with his decision to use a Class D amp and a switch-mode power supply, but let’s be real — for the application, it’s probably more than sufficient.

Thanks for the tip, [packrat].

Homebrew Radio Telescope Bags Pulsar

When one mulls the possibility of detecting pulsars, to the degree that one does, thoughts turn to large dish antennas and rack upon rack of sensitive receivers, filters, and digital signal processors. But there’s more than one way to catch the regular radio bursts from these celestial beacons, and if you know what you’re doing, a small satellite dish and an RTL-SDR dongle will suffice.

Granted, [Job Geheniau] has had a lot of experience exploring the radio universe. His website has a long list of observations and accomplishments achieved using his “JRT”, or “Job’s Radio Telescope.” The instrument looks like a homebrewer’s dream, with a 1.9-m satellite TV dish and precision azimuth-elevation rotator. Behind the feedhorn are a pair of low-noise amplifiers and bandpass filters to massage the 1,420 MHz signal that’s commonly used for radio astronomy, plus a Nooelec Smart SDR dongle and an Airspy Mini. Everything is run via remote control, as the interference is much lower with the antenna situated at his family’s farm, 50 km distant from his home in The Hague.

As for the pulsar, bloodlessly named PSR B0329+54, it’s a 5-million-year-old neutron star located in the constellation of Camelopardalis, about 3,500 light-years away. It’s a well-characterized pulsar and pulses at a regular 0.71452 seconds, but it’s generally observed with much, much larger antennas. [Job]’s write-up of the observation contains a lot of detail on the methods and software he used, and while the data is far from clear to the casual observer, it sure seems like he bagged it.

We’ve seen quite a few DIY radio astronomy projects before, both large and small, but this one really impresses with what it accomplished.

[via RTL-SDR.com]

Point Out Pup’s Packages With This Poop-Shooting Laser

When you’re lucky enough to have a dog in your life, you tend to overlook some of the more one-sided aspects of the relationship. While you are severely restrained with regard to where you eliminate your waste, your furry friend is free to roam the yard and dispense his or her nuggets pretty much at will, and fully expect you to follow along on cleanup duty. See what we did there?

And so dog people sometimes rebel at this lopsided power structure, by leaving the cleanup till later — often much, much later, when locating the offending piles can be a bit difficult. So naturally, we now have this poop-shooting laser turret to helpfully guide you through your backyard cleanup sessions. It comes to us from [Caleb Olson], who leveraged his recent poop-posture monitor as the source of data for where exactly in the yard each deposit is located. To point them out, he attached a laser pointer to a cheap robot arm, and used OpenCV to help line up the bright green spot on each poop.

But wait, there’s more. [Caleb]’s code also optimizes his poop patrol route, minimizing the amount of pesky walking he has to do to visit each pile. And, the same pose estimation algorithm that watches the adorable [Twinkie] make her deposits keeps track of which ones [Caleb] stoops by, removing each from the worklist in turn. So now instead of having a dog control his life, he’s got a dog and a computer running the show. Perfect.

We joke, because poop, but really, this is a pretty neat exercise in machine learning. It does seem like the robot arm was bit overkill, though — we’d have thought a simple two-servo turret would have been pretty easy to whip up.

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Vintage Pro Audio Hack Chat

Join us on Wednesday, May 25 at noon Pacific for the Vintage Audio Hack Chat with Frank Olson!

There was a time, and not all that long ago on the cosmic scale, that if you wanted to hear music, you either needed to make it yourself or hire someone to do it for you. For most of history, music was very much a here and now thing, and when the song was over, that was it.

Thankfully, those days are long gone, and for better or worse, we have instant access to whatever music we’re in the mood for. The Spotify client in your pocket is a far cry from the iPod of a few years back, or the Walkman of the 80s, or even a mid-century transistor radio. But no matter how you listen to your music, it all starts with getting the live music recorded, and that’s where we’ll be going with this Hack Chat.

join-hack-chatHooking up the preamps, mixers, mics, and recorders that make modern music possible is what Frank Olson is all about. You’ll probably recognize Frank’s name from his unique niche as a maker of wooden microphones, but dig a little deeper and he’s got a lot of experience with vintage pro audio gear. As both a musician and an audio engineer, Frank brings an enthusiast’s passion for recording gear to the Hack Chat, and we’re looking forward to picking his brain on the unique ways he’s found to turn sounds into music and to get to all down on tape.

Our Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, May 25 at 12:00 PM Pacific time. If time zones have you tied up, we have a handy time zone converter.

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