A Connextras video on a thing with Numitrons in it
Added 2024-07-12 18:04:48 +0000 UTCThe next main channel video is pretty far along and I think I can have it done tonight. But in the meantime, here's a follow-up for the Numitron.
Comments
Or, if it has served its purpose, sell it on Ebay and get some money back.
Arthur Robillard
2024-07-14 03:08:28 +0000 UTCYou could put it dismantled like that in your set 😉 (if you really don't want to use it as dark room timer, it has something cool vintage about it still, even if the display technology kind of... sucks...)
MrHammond
2024-07-13 08:18:04 +0000 UTCMy immediate reaction two, when Alec said "it is smelly in there" and I saw those Rifas...
MrHammond
2024-07-13 08:16:10 +0000 UTCSame! I’ve heard of their nature before and finally it happened to me when I was testing an Apple Lisa PSU! lol. I got RIFA’d!
Markintosh
2024-07-12 23:26:58 +0000 UTCAs soon as I saw the yellow packages, I thought "oh no, Rifas." Adrian even caught a Rifa failing on camera: https://youtu.be/v3-93YjJDPk?t=1005
Michael Dunn
2024-07-12 23:21:44 +0000 UTCWe did it like this for small runs of PCBs using different width rolls of sticky tape for traces. Sheets of premade IC pads and such were laid down for the components. Lift them off the sheet with the blade of an exacto knife as you also used that tool to cut off the length of sticky tape once connecting point A to B and so on and so on. All were laid down on clear acetate and then photographed 1:1 to make the negatives to then used on light-sensitive copper-clad boards and usually a UV lamp. https://www.griederbauteile.ch/download/Katalog/E-Platinen.pdf and https://www.youtube.com/watch?v=YYqTCLMN_KI
Donald J Arndt
2024-07-12 22:02:14 +0000 UTCThe mark on the silicone sleeve looks like side of the soldering iron got too close while the adjacent wires were being soldered. Maybe put it in a clear case with filter around the tubes?
William Wallace
2024-07-12 20:49:13 +0000 UTCI can help with the pronunciation of SPRAGUE. They used to have a slogan in their catalogs at parts stores. "Don't be Vague, ask for Sprague" Probably TMI, but here's the Wikipedia article on them. https://en.wikipedia.org/wiki/Sprague_Electric
J. Eric Hoehn
2024-07-12 20:16:02 +0000 UTCOw, and the reason the VIA's look so huge is because it is literally a wire soldered on both sides through a hole, no fancy plating process.
SA007
2024-07-12 20:06:45 +0000 UTCBasic circuit board design at that time was basically drawing your circuit on a blank pcb met a acid-resistant marker and etching it. For low-volume production you could do it with drawing on a transparent foil and use a photo resist and develop it like a photograph, then etch it. So they are wavy and look drawn by hand because they are.
SA007
2024-07-12 20:05:18 +0000 UTCYeah-they blow up all the time in vintage computers. Lotta crackles-a big POP-tons of smelly smoke-but they usually don’t cause damage.
Markintosh
2024-07-12 19:21:44 +0000 UTCoh fun!
Technology Connections
2024-07-12 19:19:35 +0000 UTCThose components are RIFA filter caps. At their current age they are prone to spontaneously combust when power is attached!
Markintosh
2024-07-12 18:52:44 +0000 UTC
