// #eevblog — 2019-07-25
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00:37:02 <K> how does one get a laptop without the charger?
00:37:24 <rust_collector> you get it very cheap
00:39:54 <rust_collector> guy could not find the charger, so he was going to throw it out. I popped the ssd out of it, and took the rest home. I can find a charger
01:15:07 <K> ah
01:19:39 <rust_collector> must be nice to be one of the "up there" office guys. just order a new one
01:21:08 <K> dunno, never been in such a position
01:21:14 <K> i'm using my own mbp for work
01:22:02 <rust_collector> I drive a volvo for work. I do use my own underwear and socks
01:22:18 <K> get paid amortisation (?) for it though
01:22:38 <K> which seems fair
01:22:45 <rust_collector> I guess
01:22:56 <rust_collector> how long do they think it will last?
01:23:28 <K> the mbp? previous one went on for about 6 years
01:23:42 <rust_collector> what happened to it?
01:23:44 <K> it is 2014 mid model
01:23:58 <K> too slow, was the 1st gen macbook pro
01:24:18 <rust_collector> ok, so not broken as such
01:24:20 <K> had the best keyboard i've ever seen
01:24:21 <K> yea
01:24:51 <K> well, the battery is pretty much dead, but other than that and fact that it has 32bit cpu, it is ok
01:25:05 <rust_collector> I have seen people say macbooks are the best if you have to run windows...
01:25:22 <K> pfft, dunno, i run osx
01:25:23 <rust_collector> I have no idea. mom has a mbp, it is a few years old now
01:25:31 <K> windows for the only game i play
01:25:52 <rust_collector> seems to work for her. I can not even figure out how the browser works properly
01:25:59 <K> heh
01:26:32 <rust_collector> I have used that thing for around 3 minutes.
01:27:02 <rust_collector> hmm, she also has a big old imac. I have been thinking about installing sometin gon that thing
01:27:20 <K> power pc imac?
01:27:30 <rust_collector> nah, it is an intel
01:27:38 <K> ah, then it is not so bad
01:27:39 <rust_collector> somethingsomething
01:28:24 <rust_collector> It still works well enough, but she can not update the os, at least not without paying, so it is somewhere under the stairs
01:29:29 <K> paying?
01:29:38 <rust_collector> heh, her mbp had issues for a little while, with disappearing files, and then they come back, but other files were gone
01:29:57 <rust_collector> turns out the thing had 2 os installs...
01:30:03 <K> o_O
01:30:26 <rust_collector> her ex had cancer, and did a lot of very weird things for a while
01:32:04 <rust_collector> I really have no idea how you get apples os, but I think she said she had to buy a new os... I really have no idea
01:33:58 <K> hmm, seems wierd
01:34:36 <rust_collector> ok, so you think I should dig it out, and try to make it update itself?
01:41:49 <K> how old is it?
01:42:27 <rust_collector> not sure. I would guess 14-15 or so
01:43:09 <rust_collector> I have almost not looked at the thing
01:53:30 <K> i would try, yes
01:53:51 <K> even if it has spinning disks inside
01:54:20 <K> ram might be a bottleneck though
01:59:23 <rust_collector> well. if it works, she can figure out if she wants to do anything with it, I guess
02:01:46 <rust_collector> But, now I wonder if this laptop battery is more or less dead....or not
02:02:14 <K> has it puffed up?
02:02:25 <rust_collector> nope. not that I can tell
02:02:58 <K> hm, yeah, without the charger it will be hard to tell?
02:03:00 <rust_collector> it feels like a bunch of round cells, so I guess they wouldn't
02:03:21 <rust_collector> but the shape is all wrong, lol
02:03:25 <rust_collector> too flat
02:04:16 <rust_collector> Oh well, I will just charge it a bit, and see what the confuser says when it boots
02:15:17 <K> yea
02:21:50 <rust_collector> still charging at 0.6a
02:22:00 <rust_collector> this will take some time, I think
02:25:46 <rust_collector> heh, ok, so my wires are crap. I only get 11.8 something volts on the "other end" but 12.5 on the supply
02:29:40 <K> pff, that is quite a drop
02:32:57 <rust_collector> yep
02:33:19 <rust_collector> they are just.... 50cm, I guess
02:46:46 <K> awhg 30?
02:47:15 <rust_collector> no idea. they are inside some pretty nice cheap plastic
03:50:25 Join: Nothing\ ([email protected]) to #EEVblog
04:21:17 <rust_collector> hey squirrel stuffer
09:24:57 <DHess_US> Got my new glasses. They are bifocals making me officially old.
09:29:34 <desu> my new glasses are too strong
09:29:38 <desu> makes me dizzy
09:46:03 <Ampera> DHess_US, you're not old until I say you're old
09:46:05 <Ampera> you're old.
09:52:52 <DHess_US> Glasses are a more objective measurement.
09:54:18 <coppice_> you're only middle aged when you need reading glasses. You are old when you keep losing them
10:03:21 <T3sl4> wow, no offense but you looked pretty young until very recently DHess_US
10:04:23 <coppice_> I looked very young until I became a parent
10:04:33 <T3sl4> then your old age became a parent
10:05:10 <coppice_> I was 42 when we had our first child
10:27:16 Quit: mikjaer_ ([email protected]) Ping timeout: 121 seconds
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10:30:55 <DHess_US> T3sl4, Looked? Where did you see me?
10:31:15 <T3sl4> in the looking glass, of course
10:31:59 <DHess_US> There *is* a photo of me online and you might even be able to find it. But it from a long time ago.
10:32:18 <DHess_US> K0OV took it.
10:32:19 <T3sl4> ah, so the prophesy comes true!
10:34:58 <DHess_US> https://www.americanradiohistory.com/Archive-DX/73-magazine/73-magazine-1995/73-magazine-10-october-1995.pdf
10:37:31 <T3sl4> filthy hippie
10:37:56 <DHess_US> Kept the sun off my neck.
10:38:32 <DHess_US> How many hippies wear Einstein t-shirts?
10:41:28 <T3sl4> i have an xkcd shirt
10:41:56 <T3sl4> https://i.imgur.com/WZ0efMI.jpg
10:42:12 <T3sl4> a few years old, but i haven't changed much
10:42:58 <DHess_US> You could be the Lucifer of Transistors.
10:44:04 <T3sl4> i'm certainly not in the good graces of the God of Tubes
10:44:46 <DHess_US> Haha, No?
10:45:07 <T3sl4> although i do use them more often than quite a lot of engineers, so who knows
10:45:32 <T3sl4> however, i do know a true devotee, a Cathode Follower
10:45:39 <DHess_US> I know Tom Mitchell. https://www.amazon.com/How-Service-Your-Own-Tube/dp/0962817007
10:45:49 <DHess_US> We discussed tubes often.
10:45:58 <T3sl4> heh, nice
10:57:27 <DHess_US> I don't know that I would use tubes in anything except a high voltage power supply.
11:00:31 <T3sl4> i don't foresee using them in any actual job
11:13:01 <DHess_US> I wouldn't even use them for audio which I consider a solved problem even if many modern designs are poor.
11:16:00 <T3sl4> the sheer size of the design space -- because audio amps are so easy to make -- allows an endless stream of variation among audiophools
11:17:06 <DHess_US> My next audio experiment will probably involve replacing the VAS stage with a current feedback stage. Current feedback integrators are fun.
11:18:07 <T3sl4> the inductive approach
11:20:20 <DHess_US> Well, that would be the obivous way but no, current feedback integrators can be made with capacitive feedback if you are clever.
11:20:44 <DHess_US> It requires one extra resistor and a different circuit configuraiton.
11:20:48 <T3sl4> voltage feedback integrators can be made with inductive feedback if you are clever
11:21:49 <DHess_US> I've seen that done although I dont' remember why.
11:21:50 <DHess_US> https://ars.els-cdn.com/content/image/3-s2.0-B9780128000014004488-u448-06-9780128000014.jpg
11:23:23 <DHess_US> Doing that doesn't really solve anything in an audio amplifer deisgn but I want to do it anyway.
11:23:58 <T3sl4> making stupendously fast audio amps is a funner goal
11:24:08 <DHess_US> Yea, it might be useful for that.
11:24:16 <T3sl4> done properly, you can use it for RF amplification as well
11:24:42 <DHess_US> But class-ab amplifiers up to 50 MHz are also a solved problem.
11:25:19 <DHess_US> I'm not sure what advantage there would be in extending a more traditional class-ab design that high.
11:25:42 <DHess_US> Oh, and I think it is a solved problemw ithout current feedback although I would have to check.
11:28:07 <DHess_US> Let's see, 11 MHz FG502 uses emitter degeneration so it is just a souped up audio amplifier.
11:29:50 <DHess_US> The 40 MHz FG504 does something I have not quite figured out but I don't think it is current feedback.
11:33:21 <DHess_US> 13 MHz HP3312A, another souped up audio amplifier.
11:42:11 <DHess_US> I'm not sure to call the 20 MHz HP 3314A but it isn't current feedback.
11:49:01 <DHess_US> Nobody uses current feedback in the VAS stage suggesting that it isn't a good idea.
11:56:28 <T3sl4> hm, think i could spend a few more hours (or days) optimising routes on this layout, but that seems to be everything routed, and most of the ground pours stitched
11:57:03 <T3sl4> (277 components, 157 nets, 852 pads, 499 vias, 2 layer board, 10/10 rules)
11:57:40 <T3sl4> 4.75x4.00" board
12:17:47 <DHess_US> "Asymmetrical clipping is undesirable not only
12:17:47 <DHess_US> because it reduces efficiency but also because it never looks good when
12:17:47 <DHess_US> revealed in product reviews."
12:28:38 <DHess_US> Reading Douglas Self. One of those amplifiers I mentioned used the Hitachi Push-pull VAS configuration.
12:29:51 <T3sl4> DHess_US: "Asymmetrical clipping is undesirable..." <-- also bad for hair styles, unless you're trying to set a new fashion trend
12:32:54 <T3sl4> https://www.seventransistorlabs.com/Images/InductionSmallControl.png
12:57:48 <DHess_US> Asymmetrical clipping is all of the style on Alpha Centauri. Obscure?
14:51:20 Quit: Nothing\ ([email protected]) Quit: Leaving
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18:32:26 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
19:38:44 <K> hello
20:13:39 <desu> hi
20:13:47 <desu> who buys medicine from alibaba
20:14:02 <desu> because there's a lot of people selling that on there
20:14:02 <desu> like
20:14:03 <desu> what would be the market
20:17:32 <coppice_> people who can't afford them locally?
20:47:03 <K> americans (ducks)
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