sp-codes PeerTube

It's been a looooong time... and I was thinking about connecting my ThermoNIX digital thermometer from https://www.youtube.com/watch?v=LUIvJlyHlP8 with a recorder to draw a curve of temperature changes over time. This very simple mod adds a voltage output and calibration potentiometer to the ThermoNIX, which will be helpful for setting the baseline e.g. at -10°C for outside temperature measurements.

Breaking out my LKB Bromma model 20 recorder, made by Kipp & Zonen from the Netherlands... another product from this company will appear on my channel again, stay tuned!

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I recently ordered four 1960s catalogs by Piotr Mikołajczyk, which I was keen on for years, maybe even decades - to grow my collection which previously consisted of two small ones by Leon Niemcewicz that I also show here. Walking you through some, but definitely not all vontage Polish tube catalogs, taking a deep dive into EL34 characteristics, and even taking a closer look at different lowercase "a" variants of Gill Sans... I'm a type nerd, have been since I joined the Book Art Museum and laid my hands on a Monotype machine.

These catalogs didn't cost me all that much (about 100PLN for four big ones, while a single one can go up well over 200 on OLX), they will be a great addition to my lab. I'll grow my collection further in the future, maybe even including American catalogs like the RCA receiving tube manual (this could come in handy here). But for now, these are lovely.

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I spent the last two weeks in Łódź a.k.a. Boat City, the most post-apocalyptic big city in Poland. I mainly went there to visit my mum, bring back the restored Mazur radio chassis and put it into its proper box, and do some other projects - while I also visited my friend's company, did a trip around the Book Art Museum's exhibitions, and explored the city further.

I wouldn't be myself if I didn't bring something interesting with me... Enjoy! Some of this stuff was a genuine surprise to me.

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This has been a major restoration project in my lab for the last year - and now that I got the whole "cage" a.k.a. arithmetic logic unit, I could finally get the thing working. I learned a lot of stuff on diode & transistor logic, ferrite core memory, digital electronics in general...

It's technically made in the 1960s/70s (1966-1977), so Apollo time... all this while my side of the world ran on discrete germanium transistors and ferrite core memories.

Visit the excellent https://soemtron.org/ for tons of schematics and other info! Mike Hatch is a brilliant guy to have gathered and shared all the knowledge he could find in Sömmerda.

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For some additional tech info, check out my scribbling at https://hackaday.io/project/188565-soemtron-etr220-restoration-project

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The VISOMAT BWS2 is an obscure '60s East German made device which measures the amount of light using a photocell and advances the wind-up mechanism with an adjustable stop. After the operating dial returns to its neutral position, the exposure lamp is switched off.

It's built in a heavyweight die-cast aluminum enclosure (an order of magnitude more than enough to make @EEVblog drool!), industrial strength. Spare no expense, cost no object! And it's so simple - all electromechanical, not too much electronics in it. The only semiconductor here is a single-wave selenium rectifier.

My unit comes from the Book Art Museum in Łódź, where I worked for five years. We had a small dark room in the very heart of the basement, that was used for exposing the photosensitive aluminum plates for offset printing. It had an enormous Klimsch UV light exposure device that was in a state of disrepair ever since, and it originally used arc discharge lamps as a source of light. At some point of the machine's life, these were replaced with quartz glass mercury vapor discharge lamps. One of my big projects through my museum years was discombobulating all the old equipment in the room (plumbing, wiring etc.) because it was to be repurposed as a typefounding matrix archive, with racks full of galleys containing whole typefaces from over a hundred years of Polish typographic legacy.

This exposure timer was installed on the wall and connected to the Klimsch exposure machine, and I decided to preserve it (I couldn't keep the machine for its sheer enormous size). Now that I'm Fresh-Off-The-Boat-In-The-Lab-Again, it ended up on my bench, on my hard drive, up in Youtube's cloud.

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An unusual digital test equipment from the '70s/'80s Poland. Really well made, and just look at all those LC-513 goodness! Reverse-engineered by yours truly, and now I'm walking you through its internals. It's not the only episode I'll have about it, because I haven't demonstrated it on an actual relay - but there'll be more. Including some additional use cases like measuring the retraction time of a relay being switched off.

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A bit perplexed by those flip-flops for sure!

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First video on the new and improved bench!

A little project making use of leftover parts, this thermometer was directly inspired by @IMSAIGuy and his video on LM35 temperature sensors here: https://www.youtube.com/watch?v=uO0zslcKyvc

I was increasingly annoyed that I had no way to measure the outside temperature in my lab, so I decided to make a thermometer using a Mera Lumel V628 400mV digital millivoltmeter (with Nixies!), an enclosure from a gutted Elwro 5170 pH meter which became a parts donor (that's a HLY700R for V640!), a 7805 and 7905, and some odds and ends.

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Fridge test successful. Negative temperatures are indicated as expected.

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First part of a IBM Wheelwriter 6746 mini-series. Taking a deep-ish dive... This one mainly covers the carriage and hammer solenoid, and a keyboard layout mod.

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Part 2: https://youtu.be/gCRCN1h9jIo

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I appreciated design and technical art installation ever since I worked on the lighting for the Łódź Design 2006 or so. Some of it fascinated me - both as an aesthetically minded person and a nerd and engineer. I wanted to create something in the same vein, inspired by @LOOKMUMNOCOMPUTER / @THISMUSEUMISNOTOBSOLETE and the "Display Display", a fascinating work of art with educational value gathering different types of vintage display devices and showing them in action. So, this is the one... using a rotary distribution switch from the shock generator https://www.youtube.com/watch?v=39RHIoa7gaY&t=1226s, the Visomat https://www.youtube.com/watch?v=YApRc_0Yhrw and the AEG time relay https://www.youtube.com/watch?v=yHRi_JV2VMk. So, that's four videos on the installation and its components.

Electro-Mechanix is a visual, auditory and tactile experience

The bench is busy, no bench action today! My Razer Kiyo Pro camera did well in taking the freehand shots and didn't hang up like in 2023.

Pardon my girlfriends talking and laughing in the background 😃

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The promised follow-up video for my ZOPAN PFL-22 frequency counter after thorough restoration. All cleaned up and nice inside, but does it solve any of its measurement problems I noticed in the earlier video ( https://www.youtube.com/watch?v=e-pvGzIBrUU )?

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It's hard to analyze logic while talking on the camera, haha. I may be too analog for that.

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