// #eevblog — 2026-01-10
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05:58:25 <flyback> heh
05:58:33 <flyback> I should let you guys see pics of these 300 watt psu's I got
05:58:35 <flyback> AT style
05:59:05 <flyback> they are really well build with oversized heatsinks, transformers, the lid has a seperate pcb of inductors and caps which I think is passive pfc, even the casing is 2x thickness
05:59:18 <flyback> the only thing bad is they have a fatal flaw it's not dangerous just annoying
05:59:33 <flyback> if you short +12 or overload it, the 2 switching bipolars die, but replaceable
05:59:33 <arch> being fatally killed is annoying, i agree
05:59:55 <flyback> oh yeah and on these psu's
05:59:59 <flyback> grd is NOT -
06:00:06 <flyback> so it might be totally isolated design
06:00:58 <flyback> the main transformer has a big "snort" wire coming out of it, does that mean it's a flyback?
06:01:06 <flyback> snout
06:01:38 <arch> the heck is a snout wire. you mean it's dangling out and going somewhere?
06:03:58 <flyback> I mean there's a big ass white wire coming out of the top of the transformer
06:04:08 <flyback> as if it was a elephant trunk
06:16:17 <arch> oh ok, it actually is hard to tell topology with just that info. you would have to see if it's a 2 switch forward, or 2 switch flyback, or half bridge. how many transistors or mosfets on the primary?
06:23:58 <T3sl4> arch: not reduce. shift to higher frequency. in comparison to a pulse skipping mode which does tend to have higher ripple amplitude, because lower F with same C. Iout is lower too, so it's not proportionally higher. FPWM keeps the ripple consistent and high freq, at expense of light load efficiency
06:26:10 <T3sl4> flyback: main transformer with big common ground wire hooking down to the secondary side, and big powdered iron inductor with many windings, means half bridge forward (pri) into FWCT choke-input filter (sec). extremely common PSU design, 90s-00s, maybe 2010s even
06:26:49 <T3sl4> newer ones tend to be PFC + 2-switch forward with independent inductors, or LLC resonant
06:26:49 <arch> T3sl4, so the ripple frequency compared to pulse skipping mode is higher, but the magnitude of the ripple (v_pp) is consistent across the entire range, thus leading to... better load regulation and transient response (at the expense of poorer light load performance)?
06:27:09 <T3sl4> yes
06:27:16 <arch> cool, ty T3sl4
06:27:46 <T3sl4> and if you have sensitive ADCs or radio things for example, the consistency means less chance of missing some stupid operating condition that blows out the noise floor
06:32:34 <arch> is it too critical for old computers that use negative voltage rails if they are supplied by switching reg? or should i output them at +3V higher rail, then drop down using a linear reg? or are those computers not very sensitive?
06:33:39 <arch> L7905 fed by -7V switched buck reg for example, to output "cleaner" -5V
06:35:43 <arch> (the original psu is using linregs for the -5V specifically, but no linreg for -12V--it's using trafo regulated switched output. guess -12V rail wasn't too sensitive to noise)
06:36:43 <T3sl4> i forget what even ran at -5V. +/-12 is used for RS-232 for instance
06:37:00 <T3sl4> make a -12V 1A rail and use a 7905 with a modest heatsink, it'll be fine
06:37:31 <flyback> arch two 80 watt npn's
06:38:27 <arch> the RAM ics according to vcfed forums, used the -5V rail, up to 3.6W available for consumption
06:38:28 <flyback> doesn't the psu have a -12
06:38:36 <flyback> just use a 7905 for -5 from -12
06:39:05 <arch> i was referring to my proposed solution here: https://i.imgur.com/qZOys84.png
06:40:16 <flyback> imgur is down
06:40:16 <flyback> ugh
06:40:38 <arch> what's another image hosting provider that is a good alternative?
06:40:39 <T3sl4> imgur hates people
06:41:02 <flyback> they banned me like 10+ yrs ago because they said my email provider has too much spam
06:42:26 <T3sl4> if -5 is going into RAM, i'd be wary of sequencing. look up the datasheet and see if it says anything
06:42:56 <flyback> sometimes I really hate firecrotch
06:43:01 <arch> at least for the raspberry pi, they require the higher voltage rails to come up first, followed by lower. but they don't use any negative rails
06:43:11 <flyback> like when you tell it to stop **** loading a webpage and it ignores you
06:43:28 <flyback> use a supervisor chip if you need to
06:43:36 <flyback> to ensure proper psu sequencing
06:43:57 <arch> or just go old school simple and use resistor and capacitor values for the EN pins.
06:44:14 <flyback> if you think that's reliable, sure
06:44:31 <T3sl4> usually you can wire SS to track another rail, or they all just come up in parallel (same as input voltage ramp, until each one stabilizes)
06:45:17 <flyback> I thought supervisors were simple to92 devices
06:46:48 <flyback> guess not
06:48:01 <T3sl4> that's more like reset generators
06:48:12 <T3sl4> supervisors might monitor multiple rails
06:51:49 * arch supervises T3sl4
06:51:55 <flyback> ah ok
06:52:11 <flyback> speaking of firecrotch
06:52:18 <flyback> just accidenetely triggered the memory leak bug
06:52:25 <flyback> where firefox goes mad and eats all your ram
06:52:31 <flyback> the mouse etc screech to a halt
06:52:49 <flyback> then you habe to try to wait 30-60 mins for a ssh login to login so you can kill the process
06:53:15 <flyback> somehow this time I got lucky and was able to mouse motion to kill firefox
06:53:20 <arch> firecrotch sounds like a nice gamertag
06:54:19 <arch> flyback, here's the ibm 5150 psu schematic. if you look at the -12V and -5V section, there isn't any complicated "sequencing" or "supervising" going on https://techmattmillman.s3.dualstack.us-east-1.amazonaws.com/wp-content/uploads/2017/01/5150_PSU.png
07:16:02 <flyback> im not good with reading scematics yet but I take your word for it
07:16:28 <flyback> what do you guys think about my solution for a noisy generator output
07:16:34 <flyback> causes leds to flash and ups to trip
07:16:39 <T3sl4> that transformer symbol is so cursed. winding goes up, positive waveform. winding goes down, positive waveform. winding goes down again. NEGATIVE WAVEFORM. WTF
07:17:03 <flyback> if I take a 150w 12v psu off the generator output, buffer it to a 50v 330,000 uf cap then feed it to a 12v to 120v inverter
07:17:25 <flyback> since the psu is 120-240 input it should be able to compensate for fluxuations in the generator
07:17:39 <flyback> and keep the output steady
07:18:07 <flyback> I love vibrators
07:18:14 <flyback> I'd like to own one someday
07:18:18 <flyback> NO, NOT DILDOS
07:18:30 <T3sl4> why not? dildos are great
07:18:30 <flyback> the very first smps's, mechnically driven
07:18:45 <flyback> were callled vibrators
07:18:49 <rust_collector> yes, they were used to power dildos
07:19:54 <flyback> wonder if that's why that one circuit is called a multivibrator
07:20:24 <rust_collector> mmhmm
07:24:42 <flyback> but seriously vibrators were cool
07:24:53 <flyback> yeah they were noisy and wear out but holy shit
07:25:04 <flyback> they were doing smps in electrical mechanical
07:28:21 <arch> you can make a poor man's version using a NC relay
07:29:37 <arch> relaxation oscillator
07:30:58 <arch> https://www.youtube.com/watch?v=WuG4nOyF99s
07:30:59 <EEVBot> [YouTube] Simple Relay Oscillator | 4m 40s | Channel: Ludic Science | 293,826 views | 2015-08-03 - 02:53:14 UTC
07:32:08 <flyback> yeah I know
07:32:14 <flyback> my kids electronics lab back in the day
07:32:17 <flyback> had that circuit
07:32:18 <arch> \o/
07:32:18 <EEVBot> |
07:32:18 <EEVBot> \ \
07:34:15 <arch> flyback, i just read your proposed solution to the noisy generator problem. what's the generator model?
07:35:17 <flyback> champion 1400/1800w model, I don't think this model has aver
07:35:19 <flyback> avr
07:35:53 <arch> ah so you basically have the same type of generator i have. which is a synchronous generator, running at 3600rpm most likely
07:35:58 <flyback> it's a good generator, I got thru 4 major outages with it, and I can run laptop and cable modem np but I don't like how leds spaz out
07:36:04 <flyback> correct
07:36:16 <arch> briggs engine or tecumseh?
07:36:20 <flyback> neither
07:36:30 <flyback> champion uses a licenced mitsubushi engine
07:36:34 <flyback> design
07:36:35 <arch> oh interesting
07:37:09 <flyback> the only problem I have with it is if I don't run it like once a month the carb float sticks
07:37:19 <flyback> otherwise it's been a gem
07:37:21 <arch> but anyway, i think LEDs are a crapshoot. i get flickery LEDs from grid tie sometimes. so it's bound to be worse with generator. i think it depends on how much filtering the LED driver has
07:37:22 <flyback> I only paid $150
07:37:27 <flyback> on sale
07:37:42 <flyback> ok thx
07:38:38 <flyback> I liked the champion brand because it's designed in usa, they own the factory in china so they dictate quality control
07:38:47 <flyback> theyd on't just slap their name on random china junk
07:38:47 <arch> so yes your proposed solution will work. all you're doing is going from AC<->DC<->AC. you're kinda doing a poor man's inverter generator, which do tend to output cleaner AC
07:38:56 <flyback> thx
07:38:58 <flyback> :D
07:40:08 <arch> here's the redneck way to do that from salvaged parts: https://www.youtube.com/watch?v=aY9qmeA8gVI
07:40:09 <EEVBot> [YouTube] Homebrew 1.8kW Inverter-Generator | 2m 41s | Channel: SSD99 | 358,669 views | 2010-01-21 - 23:21:20 UTC
07:40:30 <flyback> nice
07:40:31 <flyback> :D
07:41:04 <arch> yeah, no way i'm paying $1500 for a honda inverter generator. those shits cost a fortune when the solid state components fail
07:41:18 <flyback> yeah they make good generators but they are expensive
07:41:20 <arch> you can do what this guy did, for less than half the cost, AND have a crapton of battery backup, AND it's easy to fix
07:42:11 <flyback> my favorite homemade generators are PAT's
07:42:20 <flyback> pump-as-turbine
07:42:26 <arch> i love he used conduit. he's no normal hackjob youtube ape with a multimeter and hose clamps
07:42:34 <flyback> they get like 6kw old water plant water pumps
07:42:38 <flyback> and run them in reverse
07:42:43 <flyback> cheap as **** and good
07:43:16 <flyback> it works so well some pump companies are supporting it
07:43:24 <flyback> as a cheap way to do a small scale hydro
07:45:31 * electrohead hires jerry to run over arch with a race car
10:24:18 <steve30> in good news, I got an HC2 form come through today so I can get a free eye test and discount replacement lenses :)
10:49:16 <MrMobodies> Are they proper glass lenses?
10:49:19 <MrMobodies> So pleased
10:49:33 <MrMobodies> I thought I was DOOMED again at another dead end
10:49:39 <MrMobodies> https://i.postimg.cc/NQVx77rt/Kira-Eventghost-limitation-removal.jpg
10:49:39 <EEVBot> [url] Kira Eventghost limitation removal — Postimages | i.postimg.cc
10:50:30 <MrMobodies> The Kira Eventghost plugin does not seem to recognise when the IR code is altered to transmit again and duration between the next transmission despite being supported by the device.
10:50:37 <MrMobodies> It looks like it doesn't even try.
10:51:20 <MrMobodies> So instead of going to that stupid error message, instead of 'trying'just copy the message send stuff after else
10:51:23 <MrMobodies> and it work!
10:51:41 <MrMobodies> The Wallwashers turn off instantly and no second pressing of buttons
10:52:12 <MrMobodies> what a stupid limitation if the device supports it.
10:54:06 <MrMobodies> as it takes longer to transmit compared to the MCE stuff, sleep.exe don't matter.
10:54:43 <MrMobodies> but no longer sleep.exe 2 (seconds) and multiple enteries of the same thing
10:55:53 <MrMobodies> what a relief to get this idea working, all I have to do now is convert the pronto codes, test the repeats and timings.
10:57:11 <MrMobodies> I knew the "does not conform to protocal was artificial" because the lights on the unit were not flashing and if the testing tool can do it this should be able to.
11:01:13 <steve30> i always get the plastic lenses
11:01:47 <steve30> I'm going to go back to my old "proper" optician this time. I assume he'd get glass lenses if you asked but I'd rather stick with the plastic ones
11:07:12 * steve30 fires snowballs at Halcyon
11:15:57 <MrMobodies> I find the plastic ones so hard to clean
11:16:10 <MrMobodies> in the 2000's I use to loose my temper
11:16:15 <MrMobodies> trying to clean them
11:16:32 <steve30> it depends a lot on the coatings. Some coatings are very cleanable. Others are not.
11:16:50 <steve30> But if you are struggling I recommend warm water and a dab of washing up liquid#
11:17:20 <MrMobodies> It wasn't as bad before but what made matters worse before that point was when the opticians switched from alcohol spray to this "alcohol streak-free" that just caused it to smear up.
11:18:01 <MrMobodies> I use to barely be able to clean them until the opticians switches en mass to alcahol free streak free cans
11:18:08 <MrMobodies> oooh
11:18:10 <MrMobodies> I tried that
11:18:17 <MrMobodies> and it'd leave residue
11:18:33 <MrMobodies> try taking that off with a wet tissue and it'd smear upo
11:18:47 <MrMobodies> maybe it was where the plastic came from
11:19:37 <MrMobodies> in 2001, for three good years at Donald a Achinson, they told me and demonstrated that it was the glass with this lady cleaning them
11:19:55 <MrMobodies> in 2004, the frame broke, that branch shut down
11:20:07 <MrMobodies> no optician wanted to find me frame
11:20:52 <MrMobodies> went to gills to be told by this fat lady that "glass is illegal" and suffered 5 years of horrible vision and frustration
11:21:06 <MrMobodies> I met the son in 2009 where the dad retired
11:21:36 <MrMobodies> he showed me this catalogue and he ordered me the glass, I think they were photocromic as they go brown in the daylight
11:22:00 <MrMobodies> and yes no smears after cleaning with washing up liquid or gently apply a wet tissue
11:22:24 <MrMobodies> and my prescription hasn't changed after my last checkup in 2019 before I moved
11:23:03 <MrMobodies> Joke: maybe it was me getting angry cleaning them where it wasn't doing my eyes any good and I did use to see stars sometimes.
11:25:00 <MrMobodies> Maybe plastics are different now but after my experience of the monoply; small unsuitable narrow frames that don't fit and fly off my face and bullshit from most of the high street opticians they can go and f*** themselves.
11:28:08 <MrMobodies> I like my glasses and frames long wide and BIG (59 16 145). Not like narrow widescreeny ones where I see more of the blurry vision at the top and bottom.
11:31:12 <MrMobodies> also they don't wear out and neither does the tinying properties like some do
11:32:08 <MrMobodies> oops tinting properties
11:32:29 <MrMobodies> Steve30, how much did you pay for yours?
11:33:39 <Halcyon> It's going to be hot here again today, your snowballs are useless against me
11:35:02 <Halcyon> Yesterday Sydney got up to 42 degrees
11:35:46 <Halcyon> Probably be about the same again today
11:36:30 <MrMobodies> hot, it is 3c here and stormy
11:36:40 <MrMobodies> 42c wow
11:36:56 <Halcyon> Yeah even that's getting a bit too warm for me
11:37:35 <MrMobodies> Are your air conditioners effective at those temperatures?
11:38:16 <Halcyon> Oh yes, very
11:38:47 <steve30> i have some fancy "silhouette" brand glasses which I got in 2011 for £195 AFTER NHS low income discounts
11:38:55 <steve30> but those are stupidly expensive
11:39:15 <Halcyon> AC tends to struggle at low temperatures
11:39:21 <MrMobodies> in England, in many places I have seen, they have these little portable pissant ones they put behind the window say in shops, when it gets hot the heat overcomes it.
11:39:23 <steve30> I have some cheaper knock off ones which are not quite as good but plenty good enough which can be had for <£100
11:39:38 <Halcyon> Below about -5 C and they get cranky
11:39:42 <MrMobodies> wow £195,
11:39:53 <Halcyon> We have a 3-phase ducted system.
11:39:58 <Halcyon> One big outdoor unit
11:40:21 <MrMobodies> weel I did, PAY £200 for the Rayban frames to fit these lenses to find the $8 I got in 2020 from America also fit
11:40:41 <steve30> My grandmother had similar ones, which were bifocals with that transitions thing. They were £300 back in the late 2000s
11:40:54 <MrMobodies> the nose piece is higher on the Rayban so it sinks in my skin wheras the $8 don't
11:41:42 <steve30> Do you go to a traditional independent optician? Usually they are much better at taking the time to accommodate personal preferences (albeit they might be more expensive)
11:41:43 <MrMobodies> At Gills in Hornchurch if I remember, glas lens, £50 frames (generic Marchon £30)
11:41:58 <MrMobodies> it was like half price of his plastic ones
11:42:20 <MrMobodies> and he'd comment that he's not pleased with me wearing them
11:42:52 <MrMobodies> of course I respond about the cleaning of the others
11:43:39 <MrMobodies> heavenly in 2009 when I went home, and the next day cleaning them and they came out, like now CLEAN, with some residue but smears... can't stand smears,
11:43:58 <MrMobodies> gives me this unlcear rainbody vision
11:44:23 <MrMobodies> oooh
11:44:24 <MrMobodies> yes
11:44:38 <MrMobodies> Gills Optician in Hornchurch when I lived there
11:44:49 <MrMobodies> and now some shop in March on the main road
11:45:00 <MrMobodies> Gills was brilliant
11:45:19 <MrMobodies> he'd tell me all the different lenses he can get, the pro's and cons
11:45:54 <MrMobodies> and he was able to bespoke and order frames directly from the manufacturers
11:46:47 <MrMobodies> unfortunately the independent shop in March don't have that luxury but they do have laboraties that still make glass for them
11:48:12 <MrMobodies> I find cleaning me lens with he 70% alchohol wipes work good too
11:49:10 <MrMobodies> six UHS medical 70% wipes: one wipe for the leg, another for the rim and edges, and 1 per each lens front and back.
11:51:19 <MrMobodies> https://www.reddit.com/r/glasses/comments/1b61vym/cleaning_polycarbonatetrivexplastic_eyeglass/
11:51:33 <MrMobodies> aaah I see they are also referred as streaks and smudges
12:10:35 <Halcyon1> Herro people
12:10:39 <Halcyon1> *hugs Ampera&
12:12:35 * T3sl4 pinches Halcyon1
13:34:17 <Ampera> <3
13:36:55 <Halcyon> Hey Ampera!
13:37:32 <Ampera> how are you doing Halcyon
13:37:39 <Halcyon> I'm well, how's you?
13:40:17 * electrohead hugs Ampera and Halcyon
13:44:49 <steve30> should i be worried that this phone battery has a dint in it?
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