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2016-06-18 03:10 <arossdotme-planb> when ya look at this, how good or bad do you think it is? i think some people on diyaudio.com forum said it was good :/. it does have the sleep and mute pins exposed via connector which is the attractive feature :) http://www.aliexpress.com/item/TPA3116-digital-class-D-amplifier-50W-50W-with-silent-sleep-design-with-heat-sink/32654679975.html?ws_ab_test=searchweb201556_0,searchweb201602_2_10037_10017_507_10032_401_10040,searchw
2016-06-18 03:10 <arossdotme-planb> eb201603_3&btsid=c43559b8-b84a-4ded-b95c-a11eb830efa1
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2016-06-18 18:15 <wpwrak> heroic rework of he day: unsoldered a worn-out micro USB connector (from anelok) and replaced it. amazingly, the board still works. but my disdain for micro USB only deepens ...
2016-06-18 18:22 <DocScrutinizer05> well, prolly for anything micro-*
2016-06-18 18:23 <DocScrutinizer05> that's the problem with all micro things: they are really small
2016-06-18 18:25 <EDT> wpwrak: you can't hear it, but I'm clapping for you
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2016-06-18 19:40 <wpwrak> EDT: thanks ! ;-) the trick was to let "chip-quik" do its magic. tossed a huge drop on the connector (on the shield), heated it at 400something C for a minute or so, until it felt unwelcome and slid off the board.
2016-06-18 19:42 <wpwrak> DocScrutinizer05: naw, it's the specific suckiness of USB micro. they somehow messed up the angular tolerances, by trying to make them a bit too short. mini was fine and USB C also seems to correct this problem.
2016-06-18 19:42 <wpwrak> there's probably just 0.5 mm or so missing, but that's enough ...
2016-06-18 19:55 <whitequark> wpwrak: chipquik si fucking awesome
2016-06-18 19:55 <whitequark> I've reworked complete boards with chipquik two times or even more, with no lifted traces
2016-06-18 20:09 <DocScrutinizer05> which product of chipquik?
2016-06-18 20:10 <DocScrutinizer05> there is quite a number of different chipquik products  http://www.chipquik.com/store/
2016-06-18 20:13 <DocScrutinizer05> ooh I see, alloy with a melting point <100°C
2016-06-18 20:14 <DocScrutinizer05> wood's metal
2016-06-18 20:15 <DocScrutinizer05> rather Roses metal I hope
2016-06-18 20:17 <DocScrutinizer05> https://de.wikipedia.org/wiki/Roses_Metall
2016-06-18 20:24 <EDT> So I just flashed my nanonote to the most recent version, and it doesn't have emacs installed or available in the repos
2016-06-18 20:25 <EDT> anyone have experience with emacs and the nanonote?
2016-06-18 20:26 <whitequark> no
2016-06-18 20:26 <whitequark> DocScrutinizer05: its an indium alloy
2016-06-18 20:26 <DocScrutinizer05> indium? wow
2016-06-18 20:26 <whitequark> Pb-free
2016-06-18 20:26 <whitequark> I think it's BiInSn but exact composition is a trade secret
2016-06-18 20:28 <whitequark> indium is not that expensive anyway
2016-06-18 20:28 <whitequark> I have a kilo of InSn
2016-06-18 20:33 <DocScrutinizer05> Tin, Silver, Bismut, Antimony, Indium, Copper
2016-06-18 20:33 <DocScrutinizer05> http://www.chipquik.com/msds/SMD4.5NL.pdf
2016-06-18 20:40 <DocScrutinizer05> hmmmm :-)  Solder Paste no clean Sn42/Bi57.6/Ag0.4 Low Temp 138C
2016-06-18 20:41 <DocScrutinizer05> though.... will prolly fall off the PCB before chip reaches max operating temperature ;-P
2016-06-18 20:52 <DocScrutinizer05> sth completely off topic: I recently learned cochlear implants have 12 to 28 electrodes, also because they can't get more wires into the whole thing without it getting too rigid. How about one-wire serial setup with active component for each electrode?
2016-06-18 20:53 <DocScrutinizer05> they also said that more electrodes would be useless since crosstalk gets too large, but I guess that could get fixed by carefully modelling a matrix that creates compensation current on neighbor electrodes
2016-06-18 20:54 <whitequark> haahha cochlear implants
2016-06-18 20:55 <DocScrutinizer05> haha?
2016-06-18 20:55 <whitequark> fun fact: for all the techie talk about 'uploading' we still have no idea how hearing works
2016-06-18 20:55 <DocScrutinizer05> sounds about right
2016-06-18 20:56 <whitequark> i'm sometimes chatting with a friendly neuroscientist who does a masters in that area
2016-06-18 20:57 <DocScrutinizer05> they recently implemented MP3-alike audiophysiological data reduction to the cochlear implant data, improving legibility of the created sensation drastically
2016-06-18 20:57 <whitequark> *nod*
2016-06-18 21:00 <DocScrutinizer05> (crosstalk)  even when we limit the count of concurrently active electrodes to maybe 24, I guess it still would make a huge difference when you could choose the position of those active electrodes from a say 500 existing electrodes
2016-06-18 21:02 <DocScrutinizer05> a simple one-wire daisychain design (actually maybe 3 or 4 wires then) should facilitate a way higher number of electrodes
2016-06-18 21:02 <whitequark> lemme ask him
2016-06-18 21:02 <DocScrutinizer05> higher than 28
2016-06-18 21:03 <DocScrutinizer05> the needed node chips are prolly as small as 0.2*0.2*0.05mm or somesuch
2016-06-18 21:04 <DocScrutinizer05> they basicaly could integrate the electrode already
2016-06-18 21:05 * DocScrutinizer05 should file a patent ;-P
2016-06-18 21:05 <DocScrutinizer05> but like always, I bet somebody else already did
2016-06-18 21:09 <DocScrutinizer05> I already think I know the electrical macro design: GND wire, V+, V- as bus. Data as daisychain from electrode to electrode, where the electrodes actually are chips
2016-06-18 21:12 <DocScrutinizer05> maybe even 'in plane switching' with two adjacent electrodes (integrated into one chip) could work to reduce crosstalk
2016-06-18 21:15 <DocScrutinizer05> whitequark: (ask him) yes, please do. Let me know what he thinks
2016-06-18 21:15 <DocScrutinizer05> maybe we could even start a project
2016-06-18 21:29 <whitequark> lol nope, have you seen the approval time for medtech?
2016-06-18 21:30 <whitequark> how does that count against your life expectancy? how does that count against *my* life expectancy?
2016-06-18 21:37 <DocScrutinizer05> yeah
2016-06-18 21:37 <DocScrutinizer05> however an intriguing topic
2016-06-18 21:38 * DocScrutinizer05 reads about Anisotrope Conductive Adhesive, used in flipchip mounting
2016-06-18 21:39 <DocScrutinizer05> (approval time) the idea for sure wouldn't be to start a medical supply company. Rather to sell the concept to such company
2016-06-18 21:41 <whitequark> that doesn't really happen because concepts are worthless
2016-06-18 21:41 <DocScrutinizer05> prolly
2016-06-18 21:41 <whitequark> ask a grad student who really doesn't want to study
2016-06-18 21:42 <DocScrutinizer05> I might try to contact the university scientists that do R&D on that stuff
2016-06-18 21:43 <whitequark> " Error: Multiple definition of the extension constructor name Data_source_error.
2016-06-18 21:43 <whitequark> er
2016-06-18 21:43 <whitequark> wrong paste
2016-06-18 21:44 <DocScrutinizer05> btw the topic is somewhat similar to the also really pathetic retina implants they test nowadays
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2016-06-18 21:45 <DocScrutinizer05> which have a resolution of 8*8 or somesuch
2016-06-18 21:46 <DocScrutinizer05> for the latter they are evidently still in prototype state, with different issues than resolution
2016-06-18 21:46 <DocScrutinizer05> cochlear implants are well established
2016-06-18 21:47 <whitequark> "afaiu the major restriction on electrode counts is actually crosstalk between electrodes - plus more electrodes at the same stim current means more charge transfer which is bad for both the electrodes and the body. Plus these active devices would have  to operate inside the cochlea if I understand the intended design - complicates. Pictures: http://www.medel.com/blog/close-up-with-cochlear-implant-electrode-arrays/"
2016-06-18 21:48 <DocScrutinizer05> yes, that sounds all right but not to the point
2016-06-18 21:52 <DocScrutinizer05> in that picture imagine those 12 electrodes with their separating spaces in between would each be broken up into - say- 20 segments of 'partial' electrodes of which an arbitrary consecutive sequence of 10 would get activated as one 'macro' electrode, acting exactly on same physical parameters like the recent discrete design, just the virtual position of such virtual electrode could get shifted in 10 steps back and forth
2016-06-18 21:53 <DocScrutinizer05> then there's also the idea of "in plane switching" where the electrode potential isn't vs "GND" but vs twin electrode 't
2016-06-18 21:54 <DocScrutinizer05> >>active devices would have  to operate inside the cochlea<< is an issue which gets solved on a technical level, unrelated to medical concerns
2016-06-18 21:57 <DocScrutinizer05> I think flipchip will just work fine when embedded into that transparent silicon
2016-06-18 21:57 <whitequark> the majority of issues with implants are technical though...
2016-06-18 21:57 <DocScrutinizer05> sure, I know
2016-06-18 21:58 <DocScrutinizer05> it's an endless nightmare of "damn this electrode material corrodes" etc
2016-06-18 21:58 <DocScrutinizer05> but those issues are not really entangled with the core idea of daisychaining and having more and smaller electrodes
2016-06-18 22:00 <DocScrutinizer05> IPS could help a lot with crosstalk, and I'd bet nobody considered that so far since it wouldn't help anyway as long as you need to double the number of electrodes for it and you can't get more than 28 of them because of technical reasons
2016-06-18 22:02 <DocScrutinizer05> I know the stimulus current must not exceed rather low levels or there will be long term damage to the nerves
2016-06-18 22:03 <DocScrutinizer05> but that's a concern that gets handled on a calibration level, not at design level
2016-06-18 22:03 <DocScrutinizer05> s/ on / at /
2016-06-18 22:03 <qi-bot> DocScrutinizer05 meant: "but that's a concern that gets handled at a calibration level, not at design level"
2016-06-18 22:04 <DocScrutinizer05> IOW more electrodes doesn't per se mean higher stimulus current
2016-06-18 22:06 <DocScrutinizer05> au contraire IPS might mean you get away with way lower stimulus current
2016-06-18 22:07 <DocScrutinizer05> and crosstalk outside of the area of the twin electrodes should be drastically reduced
2016-06-18 22:14 <DocScrutinizer05> umm this http://i2.wp.com/www.medel.com/blog/wp-content/uploads/2013/10/Hüttenbrink-011.jpg?w=1140 already looks like they do IPS
2016-06-18 22:14 <DocScrutinizer05> no?
2016-06-18 22:16 <DocScrutinizer05> yes, the video clearly shows pairs of electrodes
2016-06-18 22:17 <DocScrutinizer05> ok, didn't know they already use IPS
2016-06-18 22:20 <DocScrutinizer05> http://i1.wp.com/www.medel.com/blog/wp-content/uploads/2014/01/Top-of-electrode.jpg?resize=600%2C450 however doesn't suggest they actually use 24 wires for that 12 electrode pairs
2016-06-18 22:43 <DocScrutinizer05> whitequark: could you ask your contact what's the deal with thiose 24 electrodes in pairs of 2, vs seemingly only 12 wires at the end where the processor connects?
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