Prywatna Wytwórnia Lamp is Aleksander Zawada's one-man vacuum tube factory, now housed in Warsaw's Institute of Vacuum Technology (Zawada's original vacuum tube factory was in his apartment). Sébastien Bourdeauducq met Zawada and did a great writeup on his handcrafted valves -- and no, it's nothing like Portlandia's artisinal lightbulbs.
He starts the triode by assembling the grid. To do this, he takes a piece of nickel wire, and soldered a small spiral of molybdenum wire on it – one turn and one solder at a time. He uses molybdenum because of its low emission of free electrons when heated (which causes unwanted grid current in tubes) and its high melting point. Soldering is done with a spot welding machine, which passes high current through the parts to be soldered (nickel and molybdenum wires). The current is so high that the metals heat and melt locally and form a small solder spot. How does one obtain such a high current? Aleksander simply took the transformer of a microwave oven, removed the high voltage secondary, and wound instead a few turns of a thick aluminum bar whose ends are connected to the copper electrodes of the welding machine. The solder current can be controlled by a triac-based dimmer connected in series with the transformer’s primary...
As a cheap source of bulbs, Aleksander uses glass enclosures he easily obtained from light bulb factories – they had plenty of surplus stock when incandescent lights were removed from sales in Europe.
Now, let’s assemble the electrodes and the bulb together. He does that by melting the bulb into the base, by rotating it and heating the bottom with a propane torch. Of course, the spinner is also made of junk materials – this time, a turntable that was originally intended to play vinyls.
Wikitribune (strapline: “Evidence-based journalism”) is a newly launched project from Wikipedia co-founder Jimmy Wales, conceived of as a crowd-edited, crowd-funded tonic against fake news.
Regular Boing Boing readers need no introduction to John Scalzi, whose smartass, snappy, funny, action-packed science fiction novels are a treat to read; but new fans and old hands alike will find much to love in The Collapsing Empire, the first volume in a new, epic space-opera series.
Life is a continuing cycle of newness, then growth, and then gone: then birth and growth again. I started thinking about that theme of new life and new beginnings several years ago, and WAKE UP!, published by Candlewick Press, is the result. Working with my collaborator, poet Helen Frost, our book is about opening eyes—our own, first—and pointing to the world that’s right here, containing us all. Helen and I are both based in the US Midwest, so we started there, with a world that we didn’t need to travel far to explore, only wake up enough to actually see.
Yeah, Bluetooth audio is pretty common these days, so why should you care about these earbuds? Look how happy that woman up above looks. She’s got FRESHeBUDS in. Boom. There’s your reason. She’s also at the beach and it appears to be a very nice day.But for the sake of promotion, wireless earbuds are fast becoming the […]
“Gets stuff done,” is a good way to be described by anybody. Especially by coworkers or bosses. Because whether you’re in finance or a children’s librarian, stuff needs to get done. But how do you make sure stuff gets done? You definitely can’t do all the stuff yourself, unless your company/organization/government office consists entirely of you. And […]
Even the most expensive pair of hi-fi headphones can’t match the feeling of bass rumbling through your body at a live show. That’s why music aficionados designed The Basslet, an accessory that reproduces that sensation from your wrist. Does it make your whole body shake with deep subs? Not really, because that would be terrifying, but […]