#qi-hardware IRC log for Saturday, 2015-02-28

wpwrakwhitequark: (Nemtsov) what's the public reaction ?10:37
kyakdefine "public"10:40
larsc'the peoples' opinion10:41
kyakthat's quite naive to assume that there is a common opinion10:46
viricthe opinion of the best people10:55
wpwrakthe public reaction may very well consist of multiple contradictory opinions12:03
wpwrakand "public" would be what is in evidence. well, if private reactions would differ widely from public ones, that would also be interesting12:04
wpwrake.g., do most people just shrug it off ? do they think this was a political killing ? do they think he had some shady business ? ...12:11
kyakhow can one know what most people think?12:13
kyakat best, one can know what people around him think12:14
kyakand usually these people are similar-minded with him12:14
kyakthis is very similar when someone concludes that results of elections are bullshit because he, his family and people around him voted for another party12:20
kyakeven if knew opinions of 10000 people, this can't be exprapolated to 145 mln population of Russia12:24
kyakand this is very different from polls in the streets where you can ask opinion of random people12:25
kyakpeople that one actually knows are not random at all12:25
viricwhat's your picture of this killing? You are the most relevant to us, because you are here. :)12:29
viricwhatever you say will become "one russian I know says ..."12:29
wpwrak"according to a source from russia" :)12:36
wpwrakkyak: so i take it there were no major public reactions. protest marches or the like ?12:36
larscthe guy was organzing a protest march, no?12:38
DocScrutinizer05(Nemtsov) at least I heard he usually had bodyguards and the killing happened in a rare time window where they were not around, so conclusion is that the killers did quite some surveillance of his habits, for several days, to spot that window where it was feasible.13:22
DocScrutinizer05other musing was about distance to Kremlin and whether the short distance rather is an argument pro or contra Putin being involved in this13:24
DocScrutinizer05sounds like futile nonsense to me13:24
DocScrutinizer05the question is: is "the public reaction" any relevant, for whom?13:29
DocScrutinizer05Putin doesn't allow opposition to grow too popular. And any bad things happening to opposition seem not to trigger significantly more opposition. So from this perspective the Nemtsov killing is prolly as negligible as the public reaction on it13:32
DocScrutinizer05in my book it's pretty similar to the early 1930s in Germany. Not everybody was already supporting the NSDAP, but the maybe 10% activists dominated everything. And yes, Putin also searching good relations to reactionary/fascist groups in whole Europe - despite (maybe rightfully) blaming Kiew politics for the same fascism. See whom he/separatists invited as observers of "elections" in Krim: Front Nationale and similar groups13:38
DocScrutinizer05funny detail: those extremist groups all over Europe are receiving financing/credits from russian banks since nobody else wants to finance them13:41
DocScrutinizer05somehow Putin seems to me like a thief on the market, pointing in an arbitrary direction and shouting "Catch the thief! Catch the thief!" and then picking the stuff he wants while everybody looks/runs the direction he pointed at13:49
DocScrutinizer05funny idea: maybe Ukraine was better off asking China directly - instead of EU - for money and weapons13:53
DocScrutinizer05would you like watching some "western propaganda"? http://www.zdf.de/ZDFmediathek/beitrag/video/2341864/Mensch-Putin%2521#/beitrag/video/2341864/Mensch-Putin!14:02
kyakwpwrak: let's wait till tomorrow. There was an opposition demonstration planned for tomorrow (irrelevant to this kill). It seems that the subject of this demonstration will now be biased15:12
kyakfrom "putin is evil" to "putin is evil, because he is behind this" :)15:13
kyakviric: if i were to have my own opinion on this, it must have been supported by proven facts15:16
kyakunfortunately, there are no such facts by now, the investigation is in its early stage15:16
virickyak: on that you may be quite alone. Wait for more direct facts to raise an opinion15:18
whitequarkthe investigation, which will be of course fair and unbiased15:19
kyakwhatever it will be, there are not other options15:19
whitequarkthere are /no/ options, not no /other/ options15:19
viricyou would know better if you were involved in the killing :)15:20
whitequarkthere is no reason to suspect that the investigation will produce results that can be trusted more than idle speculation on the internet15:20
kyaki think you are being too categorical15:22
whitequarki was much less categorical until i looked at how the kirovles case proceeded15:23
viricwhitequark categorical? :D15:23
wpwrakkyak: ah yes, the protest should be interesting16:15
wpwraki'm curious because a bit over a month ago, in argentina, a prosecutor who has accused the president (and others) of trying to cover up the amia bombing and who was supposed to speak the next day in congress, was found dead in his apartment, in what looked like a suicide16:17
wpwrakthe evening after this made the news, there were impromptu protests. then, during the next weeks, there was a lot of extremely confusing maneuvering, with government officials - including the president - jumping to all sort of conclusions, contradicting them selves, contradicting facts, attacking left and forth,16:19
wpwrakincluding the speaker if the cabinet on tv ripping a part a newspaper supposedly containing lies, which were proven as fact the next day, and so on.16:20
wpwraka few days ago, there was then the 2nd protest match, organized by prosecutors, which got some 300 kpeople in buenos aires alone on the street, despite conflicting with work hours and pouring rain.16:21
wpwrakand of course there are opinion polls that all agree that most people think that the government is somehow guilty, suspecting it was either a cleverly disguised assassination or an "induced" suicide.16:22
wpwrakall that, nota bene, without there ever having been any direct evidence for "foul play", just from the circumstances. so that shows rather clearly what people think of that government.16:24
wpwraknow, russians may not be quite so hot-headed, but i would still expect some visible reactions.16:25
kyakwpwrak: i didn't know about this story in argentina. But thinking about it, this "suicide" (whether is quotes or not) is less advantageous for the president and more advantageous to those who want tomake the conflict uncontrollable.17:30
kyakargentina is doing quite independent (from usa) things these days17:31
kyakso this is something to think about17:31
kyakmaybe there is even the third side17:32
kyaknot the argentina president, not the prosecutors17:32
kyaki just watched "The Last Supper (1995)"17:41
kyakquite interesting :)17:42
kyakthe world is much more complicated than it seems17:42
pcercueiit looks already pretty complicated to me17:46
DocScrutinizer05wpwrak: (protest march) seems in Mocow they wanna do an (even allowed) funeral procession, anticipated number of participants: 50k22:54
DocScrutinizer05wpwrak: the problem is that in Russia there's quite a number of people who believe literally everything Mr Putin says. The same people who probably killed Nemtsov and do Anti Maidan protests22:56
DocScrutinizer05"advantageous to those who want tomake the conflict uncontrollable" was an explanation that already came up22:58
DocScrutinizer05in Russia for the killing, today22:58
DocScrutinizer05"Islamists objecting solidarity with Charly Hebdo" was another nice one22:59
DocScrutinizer05"make the conflict uncontrollable" -- I guess that been Putin with playing the extreme nationalist card23:01
DocScrutinizer05somebody willing to review and comment on a schematics draft?  IR detector, for signals in the kHz range (like CIR, IrDA SIR) http://wstaw.org/m/2015/02/28/plasma-desktopJh1893.png23:06
DocScrutinizer05the resistor dimensioning is just ballpark numbers23:08
DocScrutinizer05aah, yes. Some additional feature for "advanced signal analysis"23:09
DocScrutinizer05to ADC of audio codec23:10
DocScrutinizer05C1 might be not needed or even spoiling the circuit. Meant for speedup23:11
DocScrutinizer05the signal of the pgotodiode is in the 500mV range23:12
DocScrutinizer05might be less23:12
whitequarkhmm why is it forward biased?23:12
DocScrutinizer05but the circuit is deliberately designed for low sensitivity23:13
whitequarkaren't photodiodes meant to be reverse biased?23:13
whitequarkso that you'd have a linear characteristic everywhere23:13
DocScrutinizer05(froward biased) actually it shouldn't be biased at all, but I admit I haven't checked the correct polarity23:13
DocScrutinizer05it's meant to operate as photocell23:13
DocScrutinizer05the bias is an effect that's actually not been intended originally23:14
DocScrutinizer05bias via R5 that is23:14
DocScrutinizer05NB R6 is 1k23:15
DocScrutinizer05and yes, prolly the diode needs to get reversed (again)23:18
DocScrutinizer05originally I had it reverse biased23:18
DocScrutinizer05though "bias" is ~ 1/22 of 2V23:19
DocScrutinizer05actually of threshold (R3*R4]) which is ~500mV23:20
DocScrutinizer05so 25mV bias23:21
DocScrutinizer05the idea rather is that any voltage the diode produces from "offset" by ambient light average level will adhust the threshold reference voltage on C223:22
DocScrutinizer05anyway regarding polarity of diaode: it shall crate positive voltage on opamp negative input when exposed to light23:24
DocScrutinizer05the BPW34 creates up to 7V (!) over the parallel 1kR load23:25
DocScrutinizer05unless I messed up with my scope's prpbes ;-)23:26
whitequarkwell... 7mA@7V. 49mW23:26
whitequarkyou could probably power the whole device in sleep mode from just that diode23:26
DocScrutinizer05hehe, I just would need constant electron flashing23:27
DocScrutinizer05more "normal" values to be seen in http://neo900.org/stuff/joerg/random-media/IR-photodiode/DS1Z_QuickPrint2.jpg23:28
DocScrutinizer05which is my TV remote to BPW34+1kR23:29
DocScrutinizer05with a maybe 15cm distance23:29
DocScrutinizer05that's exactly the sort of signal the circuit is meant for23:29
DocScrutinizer05prolly the threshold should get adjusted rather to 50mV23:34
DocScrutinizer05not to 500 like in the diagram's notes23:34
DocScrutinizer05so R3 470k and R5 10k would be more like it23:39
DocScrutinizer05we need to check the definitive values for the resistors with the photodiode and mounting we plan for23:42
DocScrutinizer05background:  http://neo900.org/stuff/papers/ir.pdf23:43
DocScrutinizer05"2.6  Received signal processing" redesign23:44
DocScrutinizer05we won't use HPF anymore23:45
DocScrutinizer05(except the ~10s timing constant introduced by C2 and R5 for the offset compensation)23:46
DocScrutinizer05we got a excellent S/N ratio on photon level, by the usecase of max 10cm distance between sender and our receiver. So we don't need much of a filter23:47
--- Sun Mar 1 201500:00

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