those who have worked on CRT AC/Main circuits: has anyone ever successfully converted a 240V UK monitor to 120V US? is this even possible?
scenario: about 15 years ago, an incredibly gracious person from the UK sent me their Amstrad PC/2086. both the PC and the monitor are wired for 240V, and appear to use non-switching PSUs.
rebuilding the PC to use a standard north american AT PSU is simple, and takes about 10 minutes.
the monitor, on the other hand, is unexplored territory for me. I've never worked on the input side of a CRT before. i've done plenty of flyback and cap replacements, but never anything to the AC circuit.
any amount of thinking out loud from people who have direct experience with the HV side of the circuit would be appreciated!
Alas, it may not work even if you get the power part untangled.
There's the NTSC vs PAL or other electrical protocol business, but also that many systems use the AC line frequency for synchronization, since line power freq is so stable and known.
It will depend wildly on vintage... older more difficult; consumer vs pro different (quality of circuitry and possibly some concept of portability),
As a kid my TV hacking started with, in old tube sets, identifying the audio output chain (IF cans, tubes, to audio) (you can literally touch tube pins to listen for the buzz), find the deflection circuitry, then clip lead in a capacitor from audio out into deflection. Then the audio would make crazy lissajous like patterns on the tube (rapidly leading to horrible screen burns). Shocks were common. We though it was very fun while stoned.
Not mentioned, but if anyone was interested, I'd include the complete electronic cooling system I designed for it. It's pretty goddamn cutting edge, no one has one AFAIK. 100% electronic control of engine cooling, 1-degree accuracy under all conditions, consumes 50 watts (really, not multiple horsepower), software and two pumps, no thermostat.
Also the redundant multiprocessor controllers. I ran that stuff for years, aircraft reliable (no not Boeing).
Presently installed is a conventional belt-driven pump for sale's sake,
Welcome to the 17th Pluralistic linkdump, a collection of all the miscellany that didn't make it into the week's newsletter, cunningly wrought together in a single edition that ranges from the first ISP to AI nonsense to labor organizing victories to the obituary of a brilliant scientist you should know a lot more about! Here's the other 16 dumps:
I stumbled on this 1994 FidoNews, 14 mar 1004, 11/11 it's kinda hilariously amateurish. I really liked Sylvia, she was a great editor but you can imagine the old white guy crowd wasn't induced to write.
FidoNews came out weekly, for over 20 years, had a large readership, in the dialup BBS days. I don't think many not-for-profit newsletters had that duration.
They are not rare; there's archives all over. I think.
It's pure ASCII formatted text file, raw, not html, and firefox renders it great.
I too no longer attend them. Ok I only attended one, long ago. I used to hang out with Sellem, when I lived up there. I liked him a lot.
I was on a/the classic comp mailing list more or less until I got death threats from one guy because I implied his LSI 11 might not make a great Interneting device. Sellam and a couple friends and said perp did a conf call and convinced me not to call the police as I was about to do (threat was quite specific)
I decided, hmmm, maybe some of the crazy wasn't just aesthetic.
I read some of your post but my eyes glazed over at the minute complexity. That's what crazy folk do, make things very complicated. Feature not bug. So complex you can't really explain it without reliving it.
I suspect you get a lot more... attention than most. Sorry.
Wow. Every year I've mapped and routed sports car drives in socal, lower Sierra's through yucca valley area, up to Santa Maria.
Each year keeping track of fires, rains, road damage etc has required months of planning and research.
We've driven a lot of "last time" roads. Last year it was Breckenridge road more or less 58 up to lake Isabella; it was officially closed and had to hug the hillside at the washed out road... Can't believe it survived the winter. Kennedy Meadows (from 395 side) probably impassable.
Desert and mountain road repair backlog is probably nuts.
Climate change at a high level is quite simple: it is the major side defect of coal and petroleum use. Alternative power blah blah -- until petro use is severely reduced climate will worsen (not that AE is not necessary).
Halted tomorrow, the existing carbon in the atmosphere will still increase heating.
So we need to first essentially halt petro production, then some magic futuricians will figure out how to remove carbon.
But we have a planet full of corporations that already do terrible things to us if rate-of-increase of growth/profit isn't upward, never mind stop.
I found (...) an April 1994 copy of my website, complete. I'm moving off my Mac Powerbook to a Reform (going well except for me ruining things) and as the rsync was flying by I saw it.
I'll post it soon, but here was the hardware I had at the time.
I do recall that the 386/BSD installed from some 24 (each) 1.44 mb 3.5" floppies (sic) and took a couple days to compile. honk, honk, honk, ... And failures required restarts.
"I have two machines. One is a 40MHz 386, two IDE disk drives (540MB total), a mediocre color monitor, and my one "luxury" (sic), 16MB RAM. It runs 386/BSD unix, and X. It is connected to the Internet via the services of The Little Garden, which would cost me $70/mo (we're talking 24hr/day TCP/IP not dialup) 'cept for the fact that I'm the one that runs TLG on a daily basis. The link itself is a pair of ZyZEL U-1496E 16,800baud modems. This is the machine that the Web and Gopher servers run on.
The other machine is a 386SX with 4MB RAM and an older 140MB ESDI drive. It runs DOS 5 and Windows 3.1. The graphics tools on unix are basically non-existent, as far as input tools go. It is linked to the unix box via Ethernet and some TCP/IP software (about to change). This machine has the $99 handheld scanner. The biggest limitations are 256 level monochrome, and the 4.5"/11.5cm width. Otherwise, the quality is limited by how careful you are. "
All vehicles which did not pay the Gas Guzzler Tax on purchase should be required once a year to visit an inspection station and haul 1000 pounds of manure around the block. If they can't or won't, the tax becomes due immediately.
People on Twitter are debating whether a person using uncommon words like "delve" are trying to sound smarter than they are, or worse, are ChatGPT bots, because "normal" people don't talk like that.
You don't have to get upset, or embroiled in the debate. Not worth the time or attention. But I'll share some important context as your friendly neighborhood Nigerian 🙋🏿♂️
Many Nigerians have bigger English language vocabularies and better command of grammar than the typical American or English person
My local psytrance crew announced back in Dec or Jan they were attending this party in TX for the eclipse... I half considered it, sorta, then thought, huh, dance party, psychedelics, big crowds... Texass. Uhuh nope. Too far anyway and never wanna dance more than one night and morning.
I have friend who drove there, from Oakland (SF Bay) he was stuck a couple miles outside the event, then his flakey friend lost his car keys for a few hours, then the event was cancelled. I suspect they're shivering in a damp minivan right now.