// #eevblog — 2026-03-20
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00:47:04 <arch> this is a question for the mechanics. do you guys use scotch brite roloc, or generic scuffing pads? i need to order some and im trying to decide if i should get the brand name or cheap chinese crap if it works decently enough. im mainly gonna be using them on a drill to take off old gasket material off aluminum
00:47:38 <arch> https://www.homedepot.com/p/RYOBI-2-in-Surface-Conditioning-Disc-Set-16-Piece-A911602/318211161
00:47:38 <EEVBot> [url] Access Denied | www.homedepot.com
00:47:56 <arch> like that basically, but 3m scotch brite. idk about ryobi, maybe ill try that out
00:48:24 <arch> electrohead, or DHess_US or rust_collector ^
00:49:05 <DHess_US> Shouldn't matter for cleaning aluminum.
00:49:54 <DHess_US> But it is better to start with a scrapper so that the pad does not risk removing too much aluminum and make it non-flat.
00:50:09 <DHess_US> Get one of those plastic scrapper things.
00:51:44 <DHess_US> https://www.amazon.com/dp/B0747TFNQW
00:51:44 <EEVBot> [url] Amazon.com | www.amazon.com
00:52:03 <arch> i just use a utility knife blade
00:52:37 * electrohead shaves his head, offers a shiny surface
00:52:41 <arch> that gets _most_ of the crud off, most of the time. the annoyances are really the exhaust manifold gaskets. those are some weird hybrid metallic gasket that tend to have a hard time being scraped off
00:53:39 <electrohead> I normally just scrape and use solvents if needed
00:54:32 <arch> https://www.autotoolworld.com/3M-7486-Surface-Conditioning-Disc_p_121698.html is that a decent price? $85 for a 25 pack of 3M roloc
00:54:33 <EEVBot> [url] Just a moment... | www.autotoolworld.com
01:12:23 <arch> well i went ahead and got this instead for a better assortment and since the holders themselves would have cost a lot more separately. https://www.ebay.com/itm/157755188108
01:12:24 <EEVBot> [url] 3M 2" & 3” Roloc Surface Conditioning Disc Sample Pack with Pad Holders | eBay | www.ebay.com
01:12:49 <DHess_US> Aluminum is pretty soft, so a steel scraper may be too much unless you are very careful.
01:13:14 <DHess_US> A solvent will help if the gasket is sticky.
01:13:25 <DHess_US> Goo Gone, acetone, lighter fluid, whatever.
01:14:06 <DHess_US> arch, I have a bunch of those for my die grinder.
01:14:14 <DHess_US> In a bunch of different grits.
01:14:49 <arch> i dont have a die grinder...yet. i have an angle grinder, with miscellaneous sanding pads and wire brushes for it, but it's aggressive as hell and can't get into small spaces
01:15:20 <DHess_US> I have one of those Milwaukee right angle M12 grinders for polishing welds.
01:15:33 <DHess_US> I'd be real careful using it on aluminum.
01:16:51 <arch> im using this on a hand drill lol
01:17:05 <arch> maybe like 3000rpm max i think
01:31:21 <MrMobodies> Steve30, how unusual of the NHS to apokofize.
01:32:08 <MrMobodies> oops *apologize. From my experience, they normally deny something would happe n and when it does, blame someone else or different department.
01:34:15 <MrMobodies> but seems very hot today outside, and the chickens seem to be begging for more and more food.
02:35:22 Join: Kuschelpony ([email protected]) to #EEVblog
03:00:13 * arch polishes electrohead's scalp with a brass wire brush to a mirror finish
03:01:07 <electrohead> lol
03:03:34 <arch> now i can use you as a lighthouse bulb reflector
03:35:18 Quit: Kuschelpony ([email protected]) Connection closed
03:39:25 Join: Kuschelpony ([email protected]) to #EEVblog
04:31:10 <Ysjoelfir> Oy!
04:38:33 <K> oy
04:45:54 <K> how do
04:50:28 <Ysjoelfir> eh. acceptable. alive.
04:50:30 <Ysjoelfir> u?
04:51:25 <K> same same
04:51:25 <Ysjoelfir> also, rust_collector and me wondered if you fancy a Paskha collab. because, its almost easter and you are almost eastern and I like east and eastern and rust_collector probably dislikes both
04:51:48 <K> ah that thing
04:51:59 <K> SO usually makes some
04:52:22 <Ysjoelfir> oh really?
04:52:23 <K> but that Pasha thing is more orthodox church tradition
04:52:30 <Ysjoelfir> so you would have an advantage, dang it
04:52:40 <K> not usually ptacticed by lutheran heatens
04:53:00 <Ysjoelfir> heh
04:53:14 <Ysjoelfir> I havent heard of that before I saw Boris' video
04:53:51 <K> orthodox/slavic thing, to be more precise
04:54:08 <K> but ill ask SO
04:54:19 <K> when she is back
04:55:03 <Ysjoelfir> I thought, the thing looked interesting. kinda like a fresh curd cheese / cream cheese with fruit?
04:59:39 <K> yeah, curd cheese with some fruit (raisins/apricots) and egg is mixed in i think, somehow
04:59:53 <K> hm, but not sure. I dont think it get baked
05:00:01 <K> so doubt on eggs, those would go bad
05:00:23 <Ysjoelfir> https://www.youtube.com/watch?v=oP0C-67JuoU
05:00:23 <EEVBot> [YouTube] PASKHA - the Easter dessert that nobody makes any more | 8m 33s | Channel: Life of Boris | 104,923 views | 2026-03-17 - 20:19:26 UTC
05:00:32 <Ysjoelfir> thats the video I saw from Boris, that made me consider that
05:00:34 <Ysjoelfir> he uses egg
05:00:41 <Ysjoelfir> but tempers it
05:01:14 <Ysjoelfir> also, say hi to Mrs. K from Mrs. Y and Tiny Y
05:01:31 <K> aye
05:03:07 <rc-garage> and say hi to f b m, and t also
05:06:58 <K> no u
05:07:07 <rc-garage> u also, yes
05:07:19 <rc-garage> sorry u, I forgot
05:24:39 <arch> say hi to yo momma
05:24:53 <arch> seriously. go pick up the phone and call yo momma and say hi
05:25:12 <rc-garage> why? I tlked to her...20 minutes ago, lol
05:25:21 <arch> do it just to bother her
05:25:25 <rc-garage> so now I have to fix her brakes, lol
05:25:51 <rc-garage> that sounds sinister, when i read it like that
05:25:56 <arch> "yes son, my brakes are acting up, can you replace them?" "huh? WHAT! phone's acting up! bye ma"
05:28:23 <rc-garage> I told her this was going to happen. she had it for its test today, and.... yep, the seal thing on the piston is no good, and the piston needs to be changed. but it passed anyway. but, I guess I can do a thing.
05:35:28 <arch> i need to replace out rusty transmission cooler lines on my f150 this spring or summer
05:36:05 <arch> do i bother catching the old transmission fluid in a pan, filter it with a cloth, and put it back in? or do i do a fresh drain and fill? that's a lot of transmission fluid, like 6L
05:37:05 <arch> when i say old, i mean that transmission fluid is pretty damn fresh. i did it right after i got the truck. it's less than 3 years old transmission fluid, with less than 20k miles on it
05:37:39 <rc-garage> eh, is it regular atf?
05:38:06 <arch> mercon v, ford atf
05:38:38 <rc-garage> so, yes. well, i would just replace the lines, and top it up
05:38:53 <rc-garage> unless you feel like changing the filter
05:39:04 <arch> you know what, i think i'll just filter it off and use it as fuel for my dad's tractor. and put new atf in the ford
05:39:20 <arch> mix the atf 50:50 with diesel and burn it off mowing the grass
05:39:25 <rc-garage> old diesels love a bit of atf
05:40:05 Join: Nothing\ ([email protected]) to #EEVblog
05:40:10 <Nothing\> ahoyahoy
05:40:13 <rc-garage> yep
05:40:26 <rc-garage> very annoying, that thing that you thought about, lol
05:41:06 <arch> ehh, this isn't an "old" diesel engine. it's a 3 cylinder engine from 2017. indirect injection engine.
05:41:08 <Nothing\> i got my usb power bank today. Quite pleased with it, even if the capacity was listed as higher than it is
05:41:41 <Nothing\> for a 30,000mah bank with an emergency solar panel, it's not bad at all for $30
05:41:47 <rc-garage> but it has a normal pump, and injectors that pop from pressure?
05:41:59 <Nothing\> yes, it does
05:42:01 <Nothing\> =P
05:42:32 <arch> Iseki E3112 engine
05:42:43 <arch> umm lemme see if i can find the block diag
05:42:45 <rc-garage> being a prechamber thing, makes me think it is... not the most modern engine
05:43:37 <rc-garage> oh, it is a little yanmar. cool
05:44:28 <arch> yeah it's basically a wee little garden tractor
05:44:36 <arch> GC 1710
05:44:47 <arch> https://www.tractordata.com/backhoe-loader/000/1/3/136-massey-ferguson-gc1710.html
05:44:48 <EEVBot> [url] TractorData.com Massey Ferguson GC1710 backhoe-loader tractor information | www.tractordata.com
05:45:10 <rc-garage> I find both yanmar, and isuzu ones... that is something
05:45:48 <rc-garage> ferguson, I think they are rebranded yanmar tractors. but I might be mixing that up.
05:45:53 <arch> what sucks though is that engine apparently doesn't have very many replacement parts in the US. so im tempted, but also hesitant, to use filtered semi-new atf + diesel mix to run it
05:46:44 <rc-garage> why? are you worried it will be too clean and well lubed? If I was you, I would be far more worried about running it on the garbage dieses you get over there
05:47:22 <arch> im worried it might clog up fuel injectors or whatever. replacement fuel injector for that is $600
05:48:16 <rc-garage> uhm, but you usually run atf in older diesesl, to keep the injectors and pump clean. it is basically some sort of lubricant, with a ton of detergents in it
05:49:19 <arch> hm, ok. well i'll start off with 1/4 of atf and see how it runs this spring and summer. there's lots of grass to mow
05:49:21 <rc-garage> if it was a newer style engine, I would not do it, but that is more because of particle pilters and such
05:49:29 <arch> this one has no DPF
05:49:34 <arch> it's a weel little 1.1L diesel engine
05:49:50 <rc-garage> yes. I am just saying why I would not, on something modern
05:50:26 <arch> i also have fresh, in the box, atf that i don't plan on ever needing. i'll pour in a quart of that and see how it runs
05:50:34 <arch> Mobil ATF
05:50:56 <rc-garage> and, you can leave atf in a can for a long time. no need to overdo it. just keep mixing it in a bit now and then
05:51:05 <arch> yup
05:51:41 <arch> i dont wanna toss good atf out, but at the same time i dont want it taking up space. i have like 5 gallons so far, of semi-fresh hydraulic fluid as well. maybe ill burn that off too
05:52:33 <Nothing\> rc-garage, speaking of motor vehicles, you'd get a kick out of this
05:52:51 <rc-garage> make a large circular wall of pallets, and put the oil on it, and light it on fire
05:52:57 <arch> \o/
05:52:57 <EEVBot> I
05:52:57 <EEVBot> ] {
05:52:58 <Nothing\> i don't suppose you ever watched the show Breaking Bad in its heyday did you? Seemed more an AMerican phenomenomenon
05:53:26 <Nothing\> enomenom
05:53:28 <rc-garage> I saw half an episode now and then. but did not really watch it, no
05:54:14 <Nothing\> Ah, well anyways there's one episode where they're stuck in the desert with an RV, a buncha chemistry stuff and a broken down generator with the battery on the RV being dead
05:54:42 <Nothing\> mind you dude's supposed to be super smart and chemistry/science savvy and all of this
05:55:25 <Nothing\> so he gets the idea to make some little home made batteries to jump start the RV. Making 6 cells with zinc and i think it was mercuric oxide on the other end
05:55:48 <Nothing\> they managed to turn the engine over and get it to run for a second doing that lol
05:56:24 <Nothing\> but what really saved them was "trickle charging" the RV's battery with the broken generator by cranking the shaft by hand
05:57:23 <Nothing\> despite being much lower voltage somehow that current will tunnel through the potential barrier and into the battery. Never mind the battery discharging the last of its juice into the alternator of the genny
05:57:33 <rc-garage> hm, good luck with that, lol
05:57:34 <Nothing\> or so i would imagine would happen
05:57:51 <Nothing\> rc-garage, yeah but they cranked it for a really really really long time lol
05:58:12 <rc-garage> probably a better use of energy, to start walking, lol
05:58:21 <Nothing\> I read up on the practicality of even using a bicycle and it wouldn't even come close to the 3000rpm needed
05:58:46 <Nothing\> even with a gear/sprocket train, it would be gigantic and you'd need to put in like 50x the torque
05:59:20 <Nothing\> rc-garage, they were at least 100 miles from anything. They went far out into the desert to cook their meth.
05:59:53 <Nothing\> camping out in the RV for 4 days and doing nothing but cooking meth
05:59:55 <rc-garage> 3000 rpm is just a number, you dont really need that, and, I still think they would get further by walking, than hand turning an alternator
06:00:34 <rc-garage> would be annoying to both die, and your hand hurts also
06:00:36 <Nothing\> rc-garage, well my theory is if they're not turning it fast enough the voltage will be lower than the battery's and the battery would discharge into it
06:00:52 <rc-garage> there are diodes
06:01:02 <Nothing\> rc-garage, lol the one guy had lung cancer and a lobectomy
06:01:20 <Nothing\> but he cranked it in the desert heat while dehydrated without issue
06:01:31 <rc-garage> arch, try this idea: https://youtu.be/qSjhjaN5zKI
06:01:31 <EEVBot> [YouTube] WALL OF DEATH, The building process | 6m 47s | Channel: colinfurze | 1,577,743 views | 2007-09-21 - 13:43:50 UTC
06:01:35 <Nothing\> diodes?
06:01:41 <rc-garage> diodes
06:01:45 <rc-garage> diodies
06:02:01 <Nothing\> oh dude that reminds me, the wall of death
06:02:08 <rc-garage> an alternator makes 3 phase ac
06:02:39 <rc-garage> so, it has diodes
06:02:51 <Nothing\> have you seen StyroPyro's most recent video where he connected 400 lead acid car batteries together partly in series and partly in parallel to get 64v and well over 100,000 volts
06:03:04 <rc-garage> no. just pics
06:03:34 <Nothing\> oh man did you at least see the 100 battery episode?
06:03:40 <Nothing\> even that was a treat
06:03:44 <rc-garage> nah
06:04:38 <Nothing\> the magnetic forces from the induction in the wires just from the massive current was enough to make the bundles of maybe 2 dozen 0000 awg wires try to tear themselves apart
06:05:05 <Nothing\> the whole mass of thousands of pounds of conductors jumps into the air
06:05:14 <Nothing\> lol and so does anything he put in it
06:06:05 <Nothing\> the induction seemingly caused more problems than anything else
06:06:05 <rc-garage> well, time to go inside
06:06:11 <rc-garage> have a fun or 2
06:06:11 <Nothing\> yes yes go outside
06:06:19 <Nothing\> you too buddy
06:06:32 <Nothing\> enjoy the fresh norwegian air
06:24:30 <arch> well! off to visit your mother!
06:29:46 Quit: Nothing\ ([email protected]) Quit: Leaving
06:29:59 <rust_collector> tam tam tam
06:30:06 <rust_collector> TA DAA!
06:36:24 <arch> DIOde! https://i.imgur.com/MwAcKJb.jpeg T3sl4
08:06:54 <T3sl4> nani
08:18:25 Quit: Kuschelpony ([email protected]) Connection closed
08:57:58 <DHess_US> arch, https://i.imgur.com/xZ77QAm.jpeg
08:59:44 <K> hm, is it genealy safe to chain dc-dc converters?
08:59:46 <K> directly
09:00:25 <K> like mains to 50 (smpp) to (50 -> 5, smpp)
09:00:59 Join: n4sa ([email protected]) to #EEVblog
09:03:54 <arch> K, what are the specs voltage wise
09:04:13 <K> mains to 50, 50 to 5
09:22:39 <arch> no problems at all. that's what your computer is doing anyways. taking 120VAC -> 400VDC -> 12VDC -> 5VDC
09:25:17 <arch> most smps have soft start as well as undervoltage lockout too. but if it makes you feel better, you can use an R+C time delay to let the main DC rail come up fully before activating the next one down the chain
09:27:12 <K> https://imgur.com/a/Yl1yzRf
09:27:27 <K> no overshoot, looks ok
09:27:51 <K> setup is a bit of a hodge podge
09:28:51 <arch> looks like it is ringing a bit on startup. maybe phase margin is low. do you have a transient load tester?
09:29:28 <arch> if not you can set scope to trigger on falling edge, then use a regular switch and switch a bigass resistor manually
09:30:09 <arch> honestly speaking tho, might not really matter much. what output rail is that? the 50V rail or 5V rail?
09:30:34 <K> it is a lm2596s module
09:30:54 <K> need to add a power source for rpi in this godox controller box
09:31:28 <K> rpi has its own power conditioning down the line as i understand
09:31:49 <K> but smps part on the rpi do be a bit noisy
09:32:11 <arch> lol... that lm2596 module is fake af hot garbage. those chinese scrape off the marking. it's actually a 52kHz ic
09:32:19 <K> likely
09:32:32 <arch> and the caps are also garbage. crap ESR
09:32:52 <K> well, if they die, i've made shit such that a monkey can replace parts
09:41:19 <K> a bit of a rush job
09:46:24 <arch> if they die, you'll have a destructive voltage across your gadget
09:46:37 <arch> recommend you add a crowbar if it's something important
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10:08:49 <arch> K, what's the max current draw expected by your 5V gadget? im assuming it's a RPI3
10:09:12 <K> ye, around 500mA, less even
10:09:40 <arch> oh, then you don't need to look far. just use this bad boy and call it good. https://www.ti.com/lit/ds/symlink/lmr51610.pdf
10:10:04 <K> ideally id want a module
10:10:04 <arch> way more efficient than that chinese junk, and with much smaller inductor and caps
10:10:06 <arch> oh
10:10:40 <K> going into a container and going to place far away
10:10:57 <K> final setup will be sometime in summer, so have time for small mods
10:11:13 <K> imma look into better modules, thanks for warnings
10:11:41 <arch> knock yourself out: https://www.ti.com/product-category/power-management/dcdc-modules/integrated-inductor/products.html#1129=Buck%3BSynchronous%20Buck&238max=60%3B65&sort=1130;asc&
10:11:41 <EEVBot> [url] Power modules (integrated inductor) product selection | TI.com | www.ti.com
10:14:29 <arch> i want to see at what point a typical TPS562201 synch buck, or one of its many variants, starts going unstable. they provide a max inductance value usually in the datasheet. i wanna see what happens when i use 10x the amount, 20x the amount, etc.
10:14:52 <arch> without changing the output cap, and then again perform the test, with changing the output cap
10:15:17 <arch> T3sl4, have you done a test such as the above?
10:15:34 <K> all it needs is a few caps eh
10:15:45 <K> 8 monies a pop, not bad.
10:15:56 <K> this one - https://www.ti.com/product/TPSM65630
10:15:56 <EEVBot> [url] TPSM65630 data sheet, product information and support | TI.com | www.ti.com
10:16:27 <arch> why do you need a 3A one... sort by price and pick the one that is 1A. it'll be much cheaper
10:16:45 <arch> note that larger the current rating, larger the module becuase it comes with the inductor built in
10:17:07 <K> rpi gets cranky if it dies not have proper 2A on startup
10:17:16 <arch> oh ok
10:17:17 <K> we've seen that first hand serveal times
10:19:19 <arch> MPS is also good. i would say my top 3 power IC brands are 1. TI; 2. MPS; 3. silergy
10:19:54 <arch> look thru a couple of their parametric search as well
10:20:33 <arch> https://www.monolithicpower.com/en/products/power-modules/step-down.html
10:20:34 <EEVBot> [url] Client Challenge | www.monolithicpower.com
10:22:38 <arch> OH OH! AOZ. they make some cool shit
10:23:18 <arch> funky weird shit like medium voltage synchronous step down convs that are constant on-time, with adjustable current limit, etc.
10:23:39 <T3sl4> arch: no, haven't tested that
10:23:57 <arch> ok i will find out, for science, and let you know how that goes
10:24:15 <T3sl4> do test startup/transient response as well
10:24:23 <T3sl4> if it's not just a clusterfuck mess steady-state
10:25:23 <arch> i always test transient response, at minimum
11:10:04 <ibiza> any garmin overland users in here?
12:44:55 <Halcyon> Nup
13:54:26 * steve30 collapses on Halcyon
15:26:10 <MrMobodies> https://www.theguardian.com/society/2026/mar/18/what-caused-uk-meningitis-outbreak-how-serious-is-it
15:26:10 <EEVBot> [url] What is behind the UK’s meningitis outbreak and how serious is it? | Meningitis | The Guardian | www.theguardian.com
15:26:55 <MrMobodies> "Cases of MenB linked to Canterbury nightclub"
15:27:36 <MrMobodies> Typical, diseases from willies and bums linked from these horrid nightclubs.
15:28:17 <MrMobodies> " antibiotics on the University of Kent’s campus in Canterbury. "
15:29:26 <MrMobodies> I remember back in my day, I never EVER heard of this happening, not even my sister even thought she did go to nightclubs but "drink spiking" was not even heard of at those times before the 2000's. Maybe there were but not too frequent.
15:30:00 <MrMobodies> they spike their drinks, take them home and give them their diseases.
15:30:27 <MrMobodies> "Juliette Kenny, who was studying for her A-levels – academic qualification"
15:30:40 <MrMobodies> If they are studying for "A levels" shouldn't they KNOW BETTER?
15:31:14 <MrMobodies> "Kenny was “incredibly kind, thoughtful and intelligent"
15:31:32 <MrMobodies> "Intelligent?" and she goes to these horrid places.
15:33:52 <MrMobodies> With the way things are with those places in this day and age best to stay away. There use to be a nightclub in Romford in the 1990's but I heard so many people got hurt and killed they eventually knocked it down and built a hospital on it in 2006. Queens hospital.
15:40:42 <MrMobodies> I do feel sorry those for others who go to other countries, to explore, offered free alcohol drinks that are counterfeit (where the alcohol is swapped for ethanol) and they end up dying.
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17:55:20 <K> hello clicky buttons
17:55:36 <steve30> o/
17:57:26 <K> !coffe steve30
17:59:22 * steve30 purrs at K
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21:02:26 Quit: steve30 ([email protected]) Quit: <Baljem> steve30: by the way, I had the most bizarre dream the other day that someone came in here and seriously flipped their shit over your quit message and why aren't the ops /doing/ something about it
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23:35:11 <motosteve> o/
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23:52:29 <K> moisteve30
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