// #eevblog — 2025-08-29
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00:00:27 <rust_collector> how did you meet ashley?
00:00:44 <arch> who's that?
00:01:00 <arch> is that the pokemon master? ashley ketchup?
00:01:23 <rust_collector> I do not know what she does for work...
00:03:08 Join: Rhine_Labs ([email protected]) to #eevblog
00:04:27 <arch> gotta catch em all! (stds that is)
00:05:02 Quit: Rhine_Labs_2 ([email protected]) Ping timeout: 121 seconds
00:09:51 <arch> Ampera, https://www.reddit.com/r/StardustCrusaders/comments/1ldmwtu/muhammad_avdol_cosplay_featuring_iggy/
00:10:15 <Ampera> arch, idk who that is
00:10:19 <Ampera> or what character/thing it's from
00:10:33 <arch> MOHAMMED AVDOL!!!!??!11
00:11:06 <arch> https://www.youtube.com/watch?v=jiyDOoRt2wo
00:11:06 <EEVBot> [YouTube] Avdol YES I AM! + HELL 2 U | 21s | Channel: Criz Ovo | 1,219,391 views | 2014-08-29 - 22:45:54 UTC
00:11:45 <Ampera> arch, no idea I don't watch many shounens
00:12:12 <arch> JJBA is the only shonen anime i like. well, maybe Dragon Ball Z, but only like 10 episodes before it got boring as fuck.
00:22:46 <Ampera> I like Frieren
00:22:51 <Ampera> that's a good shounen
00:27:54 <arch> uh huh, sure
00:30:30 <Ampera> arch, it is a shounen tho
01:45:11 Join: steve30 ([email protected]) to #eevblog
01:45:11 Mode: (by ChanOP) +o steve30
01:54:05 Quit: pa1983 ([email protected]) Connection closed
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02:01:34 Quit: Nothing\ ([email protected]) Quit: Leaving
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02:55:32 <Nothing\> hrm this is a thinker
02:55:57 <Nothing\> i've got the LED backing from that TV I tore down that I'd like to use as a light in my room
02:56:21 <Nothing\> except for some reason it requires at least 60vdc to light the damn thing
02:58:09 <Nothing\> i'd hate to work with mains, but I'm thinking I could run a power cord to a terminal strip, make a resistive divider, then full wave rectifier and filter and hopefully that should put out 60vdc
02:58:29 <Nothing\> then just wrap the block in electrical tape or seal it in a box
02:59:04 <Kuschelpony> uhm, the lower resistorof the voltage divider would just waste power
02:59:11 <Nothing\> i'm just wondering if i should divide the voltage before or after i rectify it
02:59:18 <Kuschelpony> none of both
02:59:25 <Nothing\> Kuschelpony, i don't care about wasting power
02:59:35 <Kuschelpony> what about just using a resistor in series
02:59:52 <Nothing\> you mean to just drop it to 60v?
02:59:55 <Kuschelpony> yes
03:00:04 <Nothing\> hrm i didn't think of that
03:00:20 <Nothing\> my solution for such an issue has always been divider
03:00:39 <Kuschelpony> it has to drop something 100v anyway (between peak of your mains and 60v led), if you add a paralell resistor on the low side there is just more current int the upper resistor without doing anything
03:00:39 <Nothing\> what about a capacitive or inductive divider?
03:00:50 <Kuschelpony> a capacitor is the very best
03:01:08 <Kuschelpony> but needs a discharge resistor to avoid surprises, and aseries resistor to limit surges
03:01:25 <Nothing\> i always wondered, what effect does the value have on a capacitive/inductive divider?
03:01:50 <Nothing\> what's the difference between a divider with 2 10uf caps opposed to one with 2 1200uf caps
03:01:58 <Nothing\> voltage rating aside
03:02:30 * Nothing\ should look into the math of it
03:06:39 <Kuschelpony> a loooot of current
03:06:57 <Kuschelpony> ok, let me check a simulater the next hour or so
03:16:10 <Nothing\> Kuschelpony, actually it only took 120ma for the whole lot
03:16:50 <Nothing\> although, i was using a 30v power supply and making up for the rest of the voltage by putting 5 9v batteries in series just to see if the set up would work
03:17:13 <Nothing\> not sure if that's bad for the power supply, but at 120ma i wouldn't imagine so
03:17:57 <Nothing\> even still, it drained those batteries damn fast
03:18:20 <Nothing\> they were brand new at ~9.3v to begin and after 10 minutes they were down to 8v
03:18:52 <Nothing\> nice proof of concept but hardly practical
03:19:37 <Nothing\> oh i misread, you were saying the difference between the two capacitive dividers is current
03:20:05 <Nothing\> lemme run a simulation in circuitmod and see. I don't know why it neve occurred to me to try this
03:23:46 <Nothing\> okay i think i get the mechanism before i even cobbled this together
03:24:24 <Nothing\> the reactance is higher/lower depending on the value of L or C, hence your remark about current
03:26:15 <Nothing\> lol and circuitmod's complaining
03:26:24 <Nothing\> CAPACITOR LOOP WITH NO RESISTANCE
03:28:16 <Nothing\> doesn't count wires as having resistance
03:34:48 <Nothing\> weird, it just took 1.2amps to blow a "250ma" fu
03:34:58 <Nothing\> fsue i got for my multimeter
03:35:21 <Nothing\> at 1amp it was glowing brightly but still intact lol
03:38:52 <arch> Kuschelpony, i think i have a question you might be able to help with regarding uc3842 and shifting the current sense voltage down below the standard 1V
03:39:03 <Kuschelpony> yep
03:39:22 <Kuschelpony> most easy might be to just clamp the "compensation" pin
03:39:40 <Nothing\> Noyce! I just snapped a very opportune picture of a female cardinal with a bluejay in my back yard
03:39:43 <arch> on page 12, figure 24: https://www.onsemi.com/download/data-sheet/pdf/uc3842b-d.pdf
03:39:44 <EEVBot> [url] Access Denied | www.onsemi.com
03:39:45 <Kuschelpony> but thats getting increasingly sensitive to temperature and noise
03:40:31 <arch> i think i read something about how that cs sense offset might not function on startup. so i figured, a way to ensure it actually works after the vref is working, is to add a RC delay to the startup
03:40:59 <arch> so in other words, until the chip is in the steady state voltage, it may not actually honor the lower shifted current sense voltage
03:41:56 <Kuschelpony> thats the kind of clamping that i meant, but they added two diodes for temperature compensation
03:41:56 <arch> do you have experience of that happening? or has it generally behaved decently with the schematic in figure 24?
03:42:08 <arch> ohh ok
03:42:25 <Kuschelpony> its wworking for sure
03:42:35 <arch> i was wondering why they added the 2 diodes. thanks for clearing that up :D
03:42:48 <arch> i assume these can be small signal diodes, like 1n4148
03:43:07 <Kuschelpony> the 5v reference is available as soon as the chip is enabled above the startup treshold
03:43:11 <Kuschelpony> yes
03:43:12 <arch> or even 2 transistors. whatever has a "relatively linear" shift in voltage with temp?
03:43:17 <Kuschelpony> yes as well
03:43:23 <arch> got it
03:43:35 <Kuschelpony> iits maximum 1mA out from the pin
03:44:20 <arch> ahhh ok, i think i see what's happening. the 2 diodes are to compensate the temp related voltage changes that appear across the two built in diodes right after the EA
03:45:24 <Kuschelpony> right
03:46:07 <arch> thanks for being the rubber ducky this time Kuschelpony :D
03:46:28 <arch> https://en.wikipedia.org/wiki/Rubber_duck_debugging
03:46:28 <EEVBot> Unexpected JSONDecodeError (Expecting value: line 1 column 1 (char 0)) from arch. Message was: https://en.wikipedia.org/wiki/Rubber_duck_debugging
03:46:28 <Kuschelpony> im always happy if the pieces of knowledge i jhave can be used to help someone
03:46:40 <Kuschelpony> oh an rubber pony :)
03:46:45 <arch> that too!
03:50:07 <arch> by the way Kuschelpony, have you ever set multiple uc38xx in synchronized operation like in figure 23?
03:50:35 <Kuschelpony> no, just either independ operation or other hacks like abusing one as MOSFET driver with overcurrent protection
03:51:41 <arch> now im curious why one would want to sync multiple uc38xx. let me ask gpt...
03:54:48 <arch> all the annoying questions that i used to bug T3sl41, gpt has taken over =(
03:55:18 <Kuschelpony> mmmmh, i see a significant difference in the quality of answeers between them :)
03:55:34 <arch> that's a fact, yeap. i just use it as a first pass.
03:55:56 <Kuschelpony> syncing is to avoid low frequency beats between two or more switchers that run at almost the same frequency
03:56:24 <Kuschelpony> the opposite strategy to dithering
03:59:21 <arch> https://www.analog.com/en/resources/technical-articles/reducing-noise-by-synchronizing-switching-regulators.html
03:59:21 <EEVBot> [url] Reducing Noise by Synchronizing Switching Regulators | Analog Devices | www.analog.com
04:12:44 <arch> https://i.imgur.com/S8iC6S0.jpeg
04:14:17 <Ampera> hallo Kuschelpony
04:14:25 <Ampera> last day for me in Deutschland
04:14:50 <Kuschelpony> oh HalloAmpera
04:15:32 <arch> https://pbs.twimg.com/media/F4p16IRa4AEywmg?format=jpg&name=small
04:16:08 <arch> in other unrelated news: i have just discovered my house might be some strange hybrid of balloon framing and platform framing
04:16:35 <arch> so ive been on a yt watching spree about what balloon framing is
04:22:24 Join: watcher ([email protected]) to #eevblog
04:26:46 Quit: watcher ([email protected]) Quit: KVIrc 5.2.6 Quasar http://www.kvirc.net/
05:09:30 Quit: Kuschelpony ([email protected]) Connection closed
06:02:26 * steve30 coffees
06:14:16 Join: Rhine_Labs_2 ([email protected]) to #eevblog
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06:19:50 <steve30> https://www.reddit.com/r/printers/comments/1n2m5n6/can_you_earn_money_with_a_paper_printer/
06:19:53 <steve30> lol
06:22:31 <K> oy there.
06:27:30 * K screeches arches eagle
09:14:34 Join: Halcyon ([email protected]) to #eevblog
09:29:52 Quit: Halcyon ([email protected]) Client exited
09:36:05 * steve30 is kdenlive-ing
09:58:04 <rc-garage> mr steve... I think this england flag thing, really is a thing... https://www.youtube.com/shorts/in31DHhpvOQ?feature=share
09:58:05 <EEVBot> [YouTube] The council are working hard 😂 #britishhumor #banter #veo3 #england #protest #comedy #politics | 25s | Channel: XL GULLY | 2,063,170 views | 2025-08-26 - 16:21:34 UTC
09:59:20 <steve30> lol
10:02:25 <steve30> I wonder is XL GULLY gets any ad revenue from Youtube, what with his entire channel being either plagiarism and AI.
10:03:02 <rc-garage> I have no idea, but i would guess he does
10:08:15 <steve30> maybe i should get in to this plagiarism business.
10:08:31 <steve30> I could get millions of views without even switching my camera on
10:20:20 <rc-garage> sure, try it and see
10:21:06 <flyback> https://video.twimg.com/amplify_video/1960848184994906112/vid/avc1/480x852/-FqyYdoGIHdNBuWH.mp4?tag=21
10:21:09 <flyback> best trolling evr
10:21:10 <flyback> er
10:30:58 <steve30> hehe
10:39:41 * Ampera pets steve30
10:39:52 <Ampera> am waiting for my bus to the airport
10:40:25 <steve30> So, how was Europe?
10:41:00 <Ampera> European
10:41:04 <Ampera> I enjoyed my time
10:41:15 <rc-garage> how was the difference between the bit of europe you saw, and germany?
10:41:42 <Ampera> went by quick enough, but made plenty of memories and photos
10:41:49 <steve30> When I went to The Netherlands in 2014 I noticed the people were less fat than they are here in England
10:42:03 <steve30> And thats despite the amount of chips they seem to eat
10:42:28 <Ampera> rc-garage: the netherlands was flatter and dutcher
10:43:19 <rc-garage> flatter... well, yes, which is pretty amazing. I at least used to like being in hollandland.
10:54:28 <K> oy rust_collector so imma be in oslo tomorrow
10:54:39 <K> and looks like it will rain all the thime
10:55:46 <rc-garage> oh perfect. they are grinding the asphalt, so that might be good
10:56:23 <rc-garage> how long are you staying?
10:57:21 <K> till tuesday
11:00:38 <rc-garage> well, at least it should not rain all that much, so you will only be moist
11:09:33 <K> mmoist.
11:10:25 <rc-garage> well, weather guy seems to get high a lot. maybe it will be ok
11:15:41 <K> it is not like you did not try to warn me
11:16:39 <rc-garage> well, it might not be bad. perhaps look at stuff inside a bit more
11:42:55 <K> yeah, we have a list
11:44:05 <rc-garage> good. but I think you should be able to find some stuff, before you read....the list
14:36:14 <rust_collector> meh, time for dinner
14:38:05 Join: Halcyon ([email protected]) to #eevblog
14:54:46 * Ampera hugs Halcyon
14:54:53 <Halcyon> Hey Ampera, how's you?
14:55:33 <Ampera> I am in Rotterdam
14:55:38 <Halcyon> I'm in Stanley
14:55:51 <Ampera> noice
14:55:56 <Ampera> i am on a bus
14:56:05 <Halcyon> I can hear cows mooing
14:56:22 <rust_collector> ask a cow for a ride?
14:56:24 <Ampera> I can see dutch people loitering
15:07:51 <steve30> i can see a Hexchat window
15:19:47 <MrMobodies> Hello
15:19:52 <MrMobodies> Would this PISS you off?
15:19:53 <MrMobodies> https://www.dell.com/support/kbdoc/en-uk/000135009/lcd-brightness-constantly-changing-with-intel-display-power-setting-enabled?lwp=rt
15:19:54 <EEVBot> [url] LCD brightness constantly changing with Intel Display Power Setting enabled | Dell UK | www.dell.com
15:20:02 <rust_collector> no
15:20:21 <MrMobodies> " it uses equations to change the chroma value and reduce the brightness of the backlight simultaneously. This means you should not see any distortion to the image on-screen."
15:20:32 <MrMobodies> I DO notice it especially with this T490s
15:20:43 <MrMobodies> which is when I switched it off
15:20:59 <MrMobodies> it does it a lot more slowly now but I still find it annoying and interfering
15:21:07 <MrMobodies> when I sit there stare and concentrate
15:21:23 <MrMobodies> and I find the brightness and contrast of thing change in the image
15:21:49 <MrMobodies> I might think I am imagining it
15:22:46 <MrMobodies> "People shouldn't notice because it uses equations"... bullsh*t.
15:23:15 <MrMobodies> what bit of "leave it alone" don't they understand.
15:24:28 <MrMobodies> so if I get a destop computer with a power hogging graphics card
15:24:41 <MrMobodies> that mean's they'd have no reason to do that
15:28:47 <MrMobodies> Also I find it false economy with this power saving thing
15:29:07 <MrMobodies> I want it bright and it gets lowered so I have to go brighter
15:30:17 <MrMobodies> similar to the Philips headphones in 2004 was it that I smashed up when they started building them to cut out at *lower* volumes. If you increased it where it'd distort, it would cut out at a slightly high volume.
15:31:07 <MrMobodies> and it'd takr 4 seconds for it to turn on and retune by which time the action of say a horror film would end.
15:32:27 <MrMobodies> I wonder if they'd start doing that with audio next, turn up and down the output amps or something to save power.
15:51:15 Quit: Halcyon ([email protected]) Client exited
16:08:02 Join: krish2487 ([email protected]) to #eevblog
16:41:11 <ibiza> Hornay!
16:41:35 <krish2487> top of the morning to you too ibiza: :-)
16:41:45 <krish2487> Good morning nice people!
16:43:22 <ibiza> ¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)¶:)
16:50:44 <krish2487> someone's in a happy mood... :-) I suppose the weekend does that..
16:56:19 <DogWomble> \@/
16:56:20 <EEVBot> I
16:56:20 <EEVBot> { >
16:56:37 <DogWomble> \@/ /@\ @< ^@^
16:56:38 <EEVBot> I
16:56:38 <EEVBot> ] [
17:05:30 <MrMobodies> Does "oxygen free copper" MATTER for audio cables
17:06:18 <MrMobodies> I remember back in the 1990's I just used the 13 amp electric cables I scrapped off a plug.
17:06:30 <MrMobodies> and I didn't notice anything off
17:07:11 <MrMobodies> is it psychological or are the differences so tiny?
17:08:30 <MrMobodies> I mean I brought a few rigid cables advertising all sorts of things but I certainly wouldn't pay a lot for them than I would with a roll cable cable
17:10:06 <MrMobodies> on second thought's is that why they coat some of them like in tin or silver to stop if oxiding.
17:10:59 <MrMobodies> yep snake oik
17:11:00 <MrMobodies> https://www.reddit.com/r/audiophile/comments/1hn0m0k/oxygen_content_in_copper_cables/
17:11:52 <MrMobodies> I think I'd go in the garage and rip some out of a role.
17:37:17 Join: watcher ([email protected]) to #eevblog
17:40:19 Quit: watcher ([email protected]) Quit: KVIrc 5.2.6 Quasar http://www.kvirc.net/
17:57:48 <MrMobodies> https://i.imgur.com/k6ZCvn3.png
17:57:59 <MrMobodies> Everi courier absolutely sh*t
17:58:16 <MrMobodies> It should have been here yesterday
17:58:43 <MrMobodies> instead today, delays but we'll let you know on "next working day" which is MONDAY!
17:59:44 <MrMobodies> I suppose there's worse, ParcelFarce which put holes in boxes and damage things.
18:45:06 Quit: rvllama643042134373896 ([email protected]) Quit: The Lounge - https://thelounge.chat
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23:50:08 <arch> i have a jar of sand
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