#eevblog - 2019-08-31 - AustNet Archive Project

// #eevblog — 2019-08-31

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« 2019-08-30 2019-09-01 »
11:36 <steve30> T3sl4, nah, these are for a ceiling light, to replace my 2x 36W tubes
11:53 <steve30> I got a roll of 4000K, but i also need to get another roll of 2700K, and some drivers
12:24 <T3sl4> ah, that
18:53 <steve30> On that subject, can anyone recommend a manufacturer of 12V PSUs?
21:57 <steve30> hmm, this new 4000K tape is a different colour to my existing 4000k tape
23:49 <T3sl4> meanwell
24:04 <T3sl4> i mean uh er, those Seven Transistor Labs guys seem to know power supplies
25:45 * steve30 hooks the LEDs up to T3sl4 
26:04 * T3sl4 purrs electrically
26:37 <K> pervs
34:13 <coppice> T3sl4: I am aquainted with power supplies, but I don't really know them, at least not in the biblical sense
56:08 <T3sl4> "[she] lusted after their lovers, whose power supplies were like those of eBay modules, and whose emission was like that of radio jammers."
01:45 <coppice> which verbage generator cooked up that line?
03:06 <T3sl4> paraphrasing a bible passage
13:50 <steve30> I called at the coffee shop for a cappuccino and a chocolate brownie this afternoon :)
15:42 <T3sl4> mmm
35:31 <DHess_US> That is two sins.
35:40 <DHess_US> Three if you count delivery.
36:04 <DHess_US> steve30, are you looking for a 12 volt power supply for embedded use or to sit on a workbench?
37:16 <DHess_US> For enbedded use, I'd buy one of those open or closed frame power supplies from Mouser or Digikey. You will have difficulty finding anything cheaper and the major brands are reliable.
37:17 <K> meanwells are quite reliable in my experience
37:27 <K> yea
37:44 <DHess_US> And honestly, I've used them as bench supplies when I needed a fixed voltage.
37:57 <DHess_US> LIke for stepper motors or laser death rays.
38:24 <K> eeh, only when you know there is nothing that needs curent limiting
38:34 <K> lest the magic smoke escape
38:35 <DHess_US> Otherwise if I was looking for a fixed 12 volt power supply, I'd look at what the radio amatures use.
38:54 <DHess_US> K, they have short circuit protection.
39:05 <K> magic smoke from your device
39:25 <DHess_US> I buy the little 12 volt frame supplies, adjust their voltage to 13.8, and use them to float charge lead acid batteries.
39:50 <DHess_US> The linear ones almost always use a 723 configuration.
40:04 <DHess_US> with foldback current limiting.
40:12 <DHess_US> And often include a current limit adjustment.
41:16 <K> i've used adjustable led drivers to charge lead-acid
41:26 <K> works quite well
41:46 <T3sl4> who buys linear supplies anymore
41:53 <K> even non-adjustable should work, but will not reach max charge though
42:25 <K> dum-dums, thats who!
42:44 <coppice> T3sl4: audiophiles
42:49 <T3sl4> ah, is that what the D stands for in DHess_US
43:04 <DHess_US> T3sl4, you should read the complaints from amature radio operators about 12 volt siwtching supplies making hash of the entire HF band.
43:12 <T3sl4> coppice: they're grade 'A' assholes
43:36 <T3sl4> DHess_US: none of mine do, i've measured them
43:39 <DHess_US> Yes, yes that's it.
43:48 <DHess_US> But plenty of others do.
44:00 <T3sl4> unfortunately there's nothing i can do about cheap chinese imports
44:12 <DHess_US> Which is why there is a market for switching power supplies intended for amature radio use.
45:09 <coppice> most SMPs problems are due to poor design, not because they switch
45:16 <DHess_US> I remember testing one where what they did was modulate the switching frequency to smear the noise spikes all over the HF band so it wasn't as noticable.
45:20 <T3sl4> or because they jumpered the EMI filter
45:52 <T3sl4> i wonder if i could make a killing selling marked up medical supplies as "amateur radio ready"
45:55 <DHess_US> Jumper meaning left out?
46:19 <DHess_US> No, the requirements for medical supplies are not stringent enough.
46:26 <DHess_US> They are more concerend with leakage.
46:33 <T3sl4> the one i tested passed class B
46:55 <coppice> medical supplies have tight leakage and isolation specs. they aren't necessarily clean
47:05 <DHess_US> So what? The class B requirements are not suffient to avoid significant HF noise.
47:15 <DHess_US> It has to be much better than class-B.
47:32 <DHess_US> Lots of stuff meets the class-B requirements and complietely trashes an HF receiver.
48:38 <T3sl4> odd, i made this thing https://www.seventransistorlabs.com/Radio_20m/Images/Radio_Wide.jpg and it uses an unfiltered Meanwell box
48:52 <T3sl4> (not shown in that early picture, unfortunately)
49:06 <steve30> DHess_US, I need a PSU to power my LED strips.
49:26 <steve30> The ones I have currently set up are powered by my 723 based Linear bench supply :)
52:03 <DHess_US> So you need a closed frame supply.
52:16 <DHess_US> How much current?
52:31 <steve30> I haven't decided yet
53:10 <DHess_US> Huh, they have a whole section for LED supplies.
53:20 <T3sl4> yup
54:03 <DHess_US> Huh, those are cute. They are little ballast sized constant current supplies.
55:40 <DHess_US> https://www.mouser.com/Power/Power-Supplies/LED-Power-Supplies/_/N-axgjtZ1yzvvqx?Rl=axgjtZer85Z1yzxoq7Z1y8t7t9SGT&Ns=Pricing%7c0
43:35 Join: ThunderSqueak ([email protected]) to #EEVblog
43:45 Mode: (by ChanOP) +o ThunderSqueak
18:57 Join: Nothing\ ([email protected]) to #EEVblog
20:04 <Nothing\> i just learned about floor and ceiling functions, maybe i'm missing something but it seems like they would just return whatever the input is
20:41 <Nothing\> like this definition of the floor function says it returns "the greatest integer less than or equal to x"
21:09 <Nothing\> well if it's equal to x it should always be x
22:51 <rust_collector> wth are you talking about? floors are for having things on, and to walk around on. ceilings are not
23:04 <Nothing\> not if you're in space
23:08 <Nothing\> haven't you ever seen 2001?
23:11 <rust_collector> no
23:24 <Nothing\> i'd strongly suggest reading it if you're into sci-fi
23:38 <Nothing\> i mean you can watch the movie, but it makes absolutely no sense without reading the book
23:49 <Nothing\> and the movie's really slow anyways, it takes forever for anything to happen
23:51 <rust_collector> I have a problem with books. But thanks
24:08 <Nothing\> i do too, i "read" audiobooks mostly these days
24:41 <rust_collector> I just never have time to sit down and read. I am not even sure if i can read printed text any more
24:43 <Nothing\> lol except i was looking for this math book the other day and the only versions i could find were audiobooks and frankly listening to a math book as an audiobook seems to kinda defeat the purpose
24:52 <Nothing\> with me it's an attention span thing
24:57 <rust_collector> yes
25:09 <Nothing\> i just can't for the life of me make myself read any more than maybe a paragraph or so of text
25:23 <Nothing\> it's made learning electronics very difficult
25:45 <rust_collector> it sort of is for me too. I can read a bit, but then I have to do something, and it is hard to get back into it
25:49 <Nothing\> plus re: electronics, i can never follow it when they try to explain how a circuit works with words rather than just showing a bloody diagram
26:35 <Nothing\> a lot of resources i came across would just explain how something works instead of showing a diagram because they figure people are scared off by diagrams because they don't understand them, but it's way easier to follow what's going on in a circuit diagram than some guy explaining it
27:18 <rust_collector> I find it is easier to understand if a guy explaing a circuit on a diagram
27:37 <Nothing\> for me when i try to get back into it, i end up reading over the last thing i read before getting distracted, then i'll get distracted again a short while later so i inevitably end up re-reading the same beginning parts over and over again trying to find where i left off the last time
27:59 <Nothing\> yeah actually, something like big clive where he draws out the diagram and explains it is the best way ime
28:44 <rust_collector> moderate size clive is pretty good, at least on the simple-ish circuits he tends to do
28:48 <Nothing\> or the worst is when you get a textbook that has a diagram and explains it with text, but the text is on another page, so you can't look at the diagram while you read about it and end up flipping back and forth
29:07 <Nothing\> i hear moderate size clive is big clive's cousin
29:26 <rust_collector> no, it is his big brother
29:26 <Nothing\> he used to be gigantic clive but he went on a diet
30:21 <Nothing\> man, i picked up diablo 3 on my switch the other day and i still haven't played it
30:30 <rust_collector> awesome!
30:55 <Nothing\> i've been hooked on the remake of final fantasy 12, i figure diablo isn't going anywhere so it can wait i guess
31:34 <rust_collector> chess is also pretty much the same
31:43 <rust_collector> I guess it can wait
31:46 <Nothing\> i think i've been playing final fantasy too much though, it has a fast forward button on it to run things 2x or 4x speed and when i'm doing things besides playing the game i keep feeling like i need to hit the fast forward button to speed things along
31:59 <Nothing\> i could never get into chess, i'm too impatient
32:12 <rust_collector> speed chess
32:14 <Nothing\> i'm no good at strategizing and planning and patience and such
32:32 <Nothing\> i don't get why moves are timed in chess
32:40 <Nothing\> like, do they get some sort of a penalty if they take too long?
32:54 <Nothing\> or are they scored afterwards on how much time they take for their moves?
33:00 <rust_collector> I think it is that they have to use at least 2 hours to do a move
33:04 <Nothing\> it just doesn't seem to have a point
33:19 <Nothing\> i've never heard of somebody being penalized for taking too long to make a move
33:35 <Nothing\> penisized
33:55 <Nothing\> join the pen15 club today!
34:38 <Nothing\> they need to make a drug that stops your hair from growing
34:49 <Nothing\> such a pain to maintain it
35:06 <Nothing\> actually... i think chemotherapy drugs stop your hair growing now that i think of it
35:10 <rust_collector> Yeah, I hate shaving my toes
35:11 <Nothing\> hmmmm
35:19 <Nothing\> lol i actually have shaved my toes before
35:38 <Nothing\> i used to shave my feet from time to time cuz the hair would get irritated from my socks
35:38 <rust_collector> did you have a good reason to do that?
35:43 <Nothing\> especially on my ankles
35:47 <rust_collector> hm
35:51 <Nothing\> not so much my toes, but i did em anyways
36:42 <Nothing\> i also used to shave rings and lines and various shapes into my leg hair in the winter because i could
36:53 <rust_collector> just a quick blast with a blowtorch... they are feet, so they already smell
37:15 <Nothing\> lol that's funny cuz i was just wondering how easy/effective it would be to just torch the hair all off
37:32 <Nothing\> but i dunno if you've ever smelled burning hair, but it's hands down the absolute worst smell EVER
37:34 <rust_collector> oh, it is quite effective
37:48 <Nothing\> i think burning hair smell is worse even than raw sewage, to a point
38:12 <Nothing\> i wonder why it smells so terrible
38:27 <Nothing\> it's such a unique smell, too i've never smelled anything quite like it
38:28 <rust_collector> pig and chicken shit mixed will tecach you something
38:39 <rust_collector> maybe it is a safety thing
38:49 <Nothing\> oh i can imagine, i've driven by farms before and caught a whiff
38:54 <rust_collector> you are almost on fire, go away
39:18 <Nothing\> heh speaking of which, apparently they turned my great aunt's old farm into a commercial grow operation for cannabis
39:41 <Nothing\> my mom and i drove past the other day and it's just fields and fields of weed surrounded by barb wire fence and cameras
39:53 <Nothing\> but the smell was so strong, we could smell it 2 concessions over with our windows up
40:15 <Nothing\> it's a wonder anybody could hide grow ops, especially in a city or near people
40:22 <Nothing\> there's no way nobody would smell it
40:45 <rust_collector> would anyone in the city care?
41:11 <Nothing\> yeah, grow ops are a huge safety concern because of improper wiring
41:21 <Nothing\> and they draw tons of power
41:28 <Nothing\> usually stolen
41:35 <Nothing\> at least the black market ones anyways
41:39 <rust_collector> hmm, and I am back to my "how do people live in a city" thing again
41:59 <Nothing\> lol i couldn't live outside of a city
42:11 <Nothing\> i used to live in a town of about 1500 people and that was bad enough
42:16 <rust_collector> I just wonder wth people do in there
42:20 <Nothing\> since i don't drive, i was pretty well stuck with what was there
42:31 <Nothing\> what do you mean? like, for fun?
42:35 <Nothing\> for a living?
42:46 <rust_collector> they go to work... then...
42:48 <rust_collector> no idea
43:07 <Nothing\> hrm well i don't work, but personally i just sit in front of the tv for about 15 hours a day
43:24 <Nothing\> other than that, i'll go for walks once in a while, i guess that's a thing
43:41 <Nothing\> you'd think there would be more to do in the city than in the country
44:01 <Nothing\> but i guess in the country you've got a big property to maintain, then the farm stuff if that's your bag
51:11 <rust_collector> it is not that I do so much, it is just that I know what I can do here, I have no idea what I would do in the city, except probably buy a tv
51:37 <rust_collector> walking in the city is not my thing
52:00 <rust_collector> hmm, not to mention we only have one city up here
52:23 <rust_collector> the rest of out "major cities" are just large towns
55:07 <rust_collector> I do like looking at old industrial buildings. I guess that is a thing
18:06 Quit: Halcyon ([email protected]) Connection closed
19:14 Quit: AndrevS ([email protected]) Connection closed
48:44 Quit: Nothing\ ([email protected]) Quit: Leaving
57:21 Quit: ThunderSqueak ([email protected]) Quit: Leaving
45:54 <EEVBlog> New EEVBlog Tweet: RT @bobdvb: @eevblog Found on eBay... Because babes weren't enough, we need a sex doll instead. https://t.co/8qhXvmKzYW
30:37 <EEVBlog> New EEVBlog Tweet: I *STILL* don't understand how I can get 5 x double sided solder masked PTH flying probe tested PCB's in my choice of colour for $2 in 3-4 days + DHL express courier for under $20. We live in insanely weird times. https://t.co/9PvDPZK1SM
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07:24 <rust_collector> oh crap, it is morning
47:18 <Ampera> rust_collector, that gets worse then you wake up at 4:30
18:09 Quit: ThunderSqueak ([email protected]) Quit: Leaving
43:45 <EEVBlog> New EEVBlog Tweet: RT @TheAmpHour: This week on the show, @Chris_Gammell and @eevblog talk about various bits of test equipment, long lead time parts and the…
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