Danke. I plugged it back in after around 12 hours and it's good now. You seem to lead an interesting life.
I've had the good fortune to work on a large range of stuff in my trade. Haven't touched medium voltage splicing/termination, fibre, welding other than thermite based, and a few other more esoteric things though.
It took some doing to get it working comfortably, but I'm now convinced that the best .epub ebook viewer for Unix systems is emacs.
the one that's part of Calibre is slow as hell because it's part of calibre, and I can't do some convenient things like single-line scrolling that actually cares about the positions of lines of text while scrolling. Fbreader is abandoned (at least as a FLOSS program) and is buggy with some ebooks.
But there's an emacs mode someone wrote called 'nov.el' (.el = emacs lisp; it's a punny name), and it is pretty performant and less impossible to debug/fix than fbreader (which again has been closed source for years).
And because it's part of emacs it's pretty highly tweakable. I'm not going to say it's particularly easy to get configured how I like it, though, unless you know emacs Lisp already.
This post has been edited by dragontamer8740: Apr 8 2021, 09:23
iPhone is a shit I can't install proxy app because there's no proxy app in appstroe and I can only install app from appstore I can't install some games like arcaea because there're not in appstore and I can only install app from appstore there's only shit left in appstore and I can only install those shit I even can't edit a main.cpp file because it says do not support .cpp extension, and rename can't changes file's suffix
I seem to have fried a switcher by placing it in series with some linear supplies to get roughly 130VDC. The switcher has good isolation and is ground lifted, but I suspect the much stouter linears and their output caps made current flow through it in a weird way. It's a Meanwell PS-45-27, a medical grade supply. It still has output, but it's a roughly sawtooth pattern spiking to maybe 31V and drooping to 15V. It only has a single IC, a TI LM3842P 'Current-Mode PWM Controller', so I suspect it's what's bad. Found a 5 pack for $12 shipped, so ordered that. I'll have to reverse engineer the supply to try and figure out what made it die and see if I can figure out where to stick diodes to make it not die again. It's all through hole, and single layer with modest track widths and spacing, so shouldn't be too hard. Nothing looked burnt, but it smelt strongly of magic smoke when I opened the chassis. Board and chassis fuses, and voltage monitor board are all fine.
This post has been edited by Wayward_Vagabond: Apr 9 2021, 15:17
I seem to have fried a switcher by placing it in series with some linear supplies to get roughly 130VDC. The switcher has good isolation and is ground lifted, but I suspect the much stouter linears and their output caps made current flow through it in a weird way. It's a Meanwell PS-45-27, a medical grade supply. It still has output, but it's a roughly sawtooth pattern spiking to maybe 31V and drooping to 15V. It only has a single IC, a TI LM3842P 'Current-Mode PWM Controller', so I suspect it's what's bad. Found a 5 pack for $12 shipped, so ordered that. I'll have to reverse engineer the supply to try and figure out what made it die and see if I can figure out where to stick diodes to make it not die again. It's all through hole, and single layer with modest track widths and spacing, so shouldn't be too hard. Nothing looked burnt, but it smelt strongly of magic smoke when I opened the chassis. Board and chassis fuses, and voltage monitor board are all fine.
To me this screams "no capacitance in parallel going across a bridge rectifier." My guess is the caps failed or some trace connected to them did. It sounds like you're getting roughly the result of running AC through a full-wave rectifier (four diodes).
Find some of the larger caps closer to the AC input plug and start testing or replacing them.
EDIT: Oh, it's switched.
IDK.
Might be able to do something hacky, like just tacking a fat capacitor on the output with with the positive leg hooked to the output and the negative leg facing the load) to reduce the DC bias and then running it through a secondary external rectification and smoothing stage, like what's seen in simple linear supplies.
This is all being written with zero critical thinking after skimming, btw, so treat these bits of advice as the ramblings of a madman that they are.
Maybe when I have more time later I'll read for comprehension and try again.
This post has been edited by dragontamer8740: Apr 9 2021, 21:09
I'd like it to resume outputting a voltage regulated 28VDC. Sawtooth wave is about 1.5 seconds per cycle.
So far I've worked it uses a programmable voltage reference, has two optocouplers for feedback, has an N channel mosfet on the high side, runs at a constant 69KHz, and regulates via PWM. And is more complicated to reverse engineer than I exected.
Edit: On the low voltage side, near the feedback area I found a crusty resistor, connected between an optocoupler and a zener. I replaced the resistor by looking at a working board, and still dead. Measured the Vf of either optocoupler on the board- 1.14V for one, and 2.8V for the one by the fried resistor. I think that's actually the problem. I can't test the zener in circuit, but I doubt it's burnt out.
Unsoldered both optocouplers- one is indeed bad. The good one tests as a transistor (NPN or PNP depending on how I hook 4 terminals to 3 leads) with VF of 1.18V. Bad one is just open. Zener has a Vf of 0.8V, and I'm not sure how Vr is defined, but 13.5V is when it passes 2ma of current. Below 13.2 or so, it passes none. Optocouplers ordered, and good one soldered back in. I'll strap a reverse polarity didoe across it, and maybe look into installing a crowbar.
This post has been edited by Wayward_Vagabond: Apr 10 2021, 18:10
@dragontamer You'd probally quite like the radio I just bought. It's an old 'hybrid' design with most of the work done by semiconductors, and vaccum tubes for the RF finals. Features a lovely green VFD for frequency readout, and a front panel covered in knobs instead of using menus.
Analysis by Guan Dabo at Tsinghua University in Beijing, China, and his colleagues suggests that the total carbon footprint of bitcoin mining in China will peak in 2024, releasing around 130 million metric tonnes of carbon.
This figure exceeds the annual carbon emissions of countries including Italy and the Czech Republic.
This post has been edited by Necromusume: Apr 13 2021, 05:24
@dragontamer You'd probally quite like the radio I just bought. It's an old 'hybrid' design with most of the work done by semiconductors, and vaccum tubes for the RF finals. Features a lovely green VFD for frequency readout, and a front panel covered in knobs instead of using menus.
Oh hey, probably would. I used to repair those kinds of things at my first job. I think I showed you my stereo before. Or maybe it was Mags. But it's a JVC R-S5. No tubes in it, but it's pretty nice.
I love magic eye tubes for tuning, though; I'd love to have one like that again some day.
QUOTE(resident88 @ Apr 12 2021, 19:18)
Graphics Cards prices are still out of control. Fuck the blockchain.
You know, if I actually had any reason to buy a new GPU I'd probably feel more sympathetic.
Just successfully patched and burned a hack of the PAL release of Sonic CD made to run at 60hz again on US-region Sega CD's, so now I have the better Sonic CD soundtrack in a playable format in English.
For those who didn't know, Europe and Japan have a totally different soundtrack for Sonic CD than America got.
"Sonic Boom" came out of it, so the american one wasn't all bad, but I still prefer the other one overall since the music feels more "sonic-like," whatever that means.
This post has been edited by dragontamer8740: Apr 13 2021, 11:03
Just successfully patched and burned a hack of the PAL release of Sonic CD made to run at 60hz again on US-region Sega CD's, so now I have the better Sonic CD soundtrack in a playable format in English.
For those who didn't know, Europe and Japan have a totally different soundtrack for Sonic CD than America got.
"Sonic Boom" came out of it, so the american one wasn't all bad, but I still prefer the other one overall since the music feels more "sonic-like," whatever that means.
For some reason I thought you could burn the NTSC version with the audio tracks from the European version.
[www.rigpix.com] It's about 40 years old now, and minus a very slight frequency drift modern digital VFOs don't have- some 100Hz per hour once warm (Kenwood did make a couple of external digital VFOs tht can be used with it), is still considered a great performer and is regarded as one of the best hybrid transceivers sold. Sadly, it was also one of the last. Mine is a gold label version. I can't post a pic from the listing without doxing the gentleman that sold it to me.
This post has been edited by Wayward_Vagabond: Apr 13 2021, 15:20
For some reason I thought you could burn the NTSC version with the audio tracks from the European version.
I might attempt that; I wonder why someone made a 60hz patch for the PAL version that also uses the USA region code, if that is indeed the case.
My first guess is that it's because some non-redbook audio samples were changed for the US release (e.g., stuff that's in the binary track). I'd imagine that that would include the FMV's, since they probably use compressed music muxed in with the video frames for playback (Sega CD is a 1x drive only).
The music that plays when sonic is invincible is also different, but IDK if that's just a redbook track or not.
This post has been edited by dragontamer8740: Apr 14 2021, 10:13
I might attempt that; I wonder why someone made a 60hz patch for the PAL version that also uses the USA region code, if that is indeed the case.
My first guess is that it's because some non-redbook audio samples were changed for the US release (e.g., stuff that's in the binary track). I'd imagine that that would include the FMV's, since they probably use compressed music muxed in with the video frames for playback (Sega CD is a 1x drive only).
The music that plays when sonic is invincible is also different, but IDK if that's just a redbook track or not.
I looked up the issue, I haven't looked into the Sonic CD audio swap in a decade or so.
The issue was some of the audio was not stored as redbook tracks and was in the game files .
The Past music was harder to replace, one person succeeded but the audio quality was lower.
So it looks like patching the PAL version to work on NTSC is the best method for MegaCD players.
People found ways to do it with emulators and on the PC version but I think the PAL patch is probably the best method for console?
This post has been edited by EsotericSatire: Apr 14 2021, 13:12
I looked up the issue, I haven't looked into the Sonic CD audio swap in a decade or so.
The issue was some of the audio was not stored as redbook tracks and was in the game files .
The Past music was harder to replace, one person succeeded but the audio quality was lower.
So it looks like patching the PAL version to work on NTSC is the best method for MegaCD players.
People found ways to do it with emulators and on the PC version but I think the PAL patch is probably the best method for console?
Yeah, I'm using a model 2 CD unit with a Model 1 console. If on a PC, I'm sure I'd be able to just use that (although I think they removed the vocals from the JP/EUR tracks in that release).
Still, since I bought a Mega CD/Sega CD for exactly five video games (Lunar: The Silver Star, Lunar: Eternal Blue, Popful Mail, Sonic CD, and the Phantasy Star II text adventure collection), I gotta justify owning it somehow. And it's really awesome how it just will play burned CD-R's without any fuss at all.
I'd love it if some more of the Japan-exclusive titles got translated some day, too (Shin Megami Tensei had a port, for instance, and there are plenty of other RPG's that we never got). But because it's the fucking Mega CD and almost no one cares about it in the west, IDK how likely that is to happen.
I'm probably gonna buy a PC Engine and CD unit sometime, just for Ys. Of course, that'd be a pain if I wanted to play US turbografx-16 cards, but since all the good ones (bomberman) cost an arm and a leg here I'd just be buying a flash cart anyway.
Have some surprisingly fluid sanic by Toei animation.
Also I should probably finish re-capping my game gear (I notice that part of that song is like the Game Gear/Master System Sonic 2 Green Hills Zone).
QUOTE(Anime Janai @ Apr 13 2021, 19:03)
I enjoy the AMIGA posts. I am still an AMIGA fan although I no longer use them.
I've not had time to do too much with my A500 recently, but the next things on my list are to figure out a way to make my kickstart switcher sit lower or off to the side in my system (so the keyboard doesn't physically push on it) and upgrade it to a "Super Denise" (ECS Denise) chip so I can get some more resolution options.
I'll probably end up using one of those [www.jameco.com] 40-pin DIP IDC connector things, some ribbon cable, and I'll have to manually solder all the stupid ribbon cable leads to a female DIP socket on the other side since no one seems to make a female equivalent for the connector. That or I fab a PCB, which IDK if I want to learn to do right now.
It's about 40 years old now, and minus a very slight frequency drift modern digital VFOs don't have- some 100Hz per hour once warm (Kenwood did make a couple of external digital VFOs tht can be used with it), is still considered a great performer and is regarded as one of the best hybrid transceivers sold. Sadly, it was also one of the last. Mine is a gold label version. I can't post a pic from the listing without doxing the gentleman that sold it to me.
That's a beautiful device. Have a picture or two of my oscilloscope (probably my oldest mostly-working equipment; entirely transistor-based except for the CRT, and uses an early single-sided PCB for part of it with point-to-point wiring for the rest). It almost definitely needs new capacitors, but I replaced the canister with a couple discrete parts a few years ago and also replaced the one leaky capacitor on the PCB that was emitting smoke when I turned it on. Click images for full sizes. [i.imgur.com] (IMG:[i.imgur.com] https://i.imgur.com/W9jJ5ffg.jpg) [i.imgur.com] (IMG:[i.imgur.com] https://i.imgur.com/9ZGh24Lg.jpg) Yeah, it needs a cleaning.
QUOTE(Rob Itagaki @ Jan 12 2011, 19:04)
Anybody know a free site/application that updates your drivers for you?
What is the last thing you thought?, Tech Edition
Apr 7 2021, 17:19
