IRC log for #qi-hardware on 20120725

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02:31.28kristianpaulhe, i wonder why eeschma always warms when having another running instance of it
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12:52.02qi-botJon Phillips: Hardware is hard! Even if your project raises loads of money on kickstarter! @qihardware http://t.co/SH9ETRBk ( 228110218654019584@rejon - 33s ago via Seesmic )
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13:54.04qi-bot[commit] Paul Cercueil: fbcon: update documentation for the "bind" parameter. (jz-3.5) http://qi-hw.com/p/qi-kernel/e46b4fc
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16:01.28wpwrakall quiet in qi-land :)
16:09.29larschow was your talk?
16:11.27kristianpauldid you recorded it?
16:12.44kristianpaulwpwrak: btw about capacitor i noticed you se cap value/RF in atben for some of then
16:12.57kristianpauldo you have another specific notation i should be aware.....
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18:02.43viricWhat is likely to shorten the life of electrolithic capacitors?
18:08.06larsca hammer!
18:08.23viric:)
18:08.28viricthis sheeveaplug power supply...
18:08.34viricblew up the capacitors again
18:08.45larscagain?
18:08.57viricevery year or half a year, time to replace some big capacitors
18:09.20larscoh
18:09.29viricmaybe I should understand the circuit instead of simply replacing them
18:09.37viricif it were open hardware... :)
18:10.29rohviric: gets to hot.
18:10.30Aylause capacitors that support a higher Volt value
18:11.09viricI thought of that
18:11.18viricit's an easy parameter to change
18:11.25viricbut a bit hard to make all fit in the case :)
18:11.38rohwell.. its a design flaw
18:11.39viricone is 450V :)
18:11.47viricyes sure
18:11.52viricbut I don't know th fix
18:11.54viricthe fix
18:11.57rohthats the loading cap for the primary side
18:12.06rohthere is no fix afaik
18:12.51viricwell, last time it blew up (not the 1st time)
18:12.51rohs/loading/charging
18:13.01viricnow it's another one, smaller
18:13.06viric16V
18:13.11rohcaps derate at high temperatures
18:13.23viricuntil 105°C all say
18:13.34rohalso high rf currents can make similar effects. thats why low-esr is important in psu
18:13.55roh105 is the higher one of 2 usual cap ratings. doesnt mean they survive long at such temps
18:14.09rohusually it should be way below 60deg C in there.
18:14.22viricon summer it gets far hotter
18:14.35viricin the box. :)
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18:14.54viricso it's like something needs good ventilation.
18:15.20rohmaybe you can modify it to use a external supply. how many and which secondary voltages does the psu do?
18:15.26roh5V? 3.3?
18:15.29viriconly 5V
18:15.44rohwell.. then just remove the psu and add a barrel conn.
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18:16.04viric1amp though.
18:16.09viricor 2.
18:16.14viriclet's say 2.
18:16.27rohwell.. measure it and use a properly overspec-ed psu
18:16.41rohi guess a 2A psu will do fine. after all its just a 10W or so device
18:16.44viricI know it takes ~7W from 22V
18:16.48viricI know it takes ~7W from 220V
18:17.33viricI'll have to do that..
18:22.19viricI found a power supply at home that has a usb port 5V/2A, it says.
18:33.13qi-bot[commit] Werner Almesberger: fisl2012/: fix some typos (master) http://qi-hw.com/p/wernermisc/c52e2b9
18:33.14qi-bot[commit] Werner Almesberger: fisl2012/: add kicad schematics diagram; trim Makefile (master) http://qi-hw.com/p/wernermisc/d5a0a83
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18:56.14whitequarkalso, reverse polarization
18:56.38whitequarkoh, I see, not the case here
19:00.40viricno, I think it's not the case
19:00.49viricI thought reverse polarization would make them blow quickly
19:00.50viric:)
19:01.14whitequarknot necessarily
19:01.24whitequarksuppose they're reverse polarized by -5V for 1% of the time
19:01.37whitequark(if the input voltage is 220V)
19:01.38viricas in... мгновенно
19:01.45whitequarkheh
19:02.01viricok
19:02.26viricfor me it's very hard to pronounce 'мгн'.
19:02.50whitequarkwhat's your first language?
19:02.55viricwhich reminds me that today I encountered a unicode character for MHz.
19:03.01viriccatalan.
19:03.44whitequarkmhm
19:03.52viricwho thought of a single character for MHz? weird.
19:03.54whitequarkwhat's your reason for learning Russian?..
19:03.58viricI wonder how much more like that there are.
19:04.04whitequark(MHz) that's Unicode, they have lots of weird stuff
19:04.21viriclooks like so.
19:04.23whitequarke.g. emoji. a single character for "tanabata sunrise" or something like that, I don't quite recall
19:05.08viricas for the reason... well, the cyrillic looked like funny for me, and the soviet past (so much hidden to us) also added some magic to it
19:05.12whitequarkand it's not a kanji character; it's a pictogram which is only used by emoji
19:05.29viricis emoji the name of something?
19:05.51viricor your explanation looks to me a bit recursive?
19:05.53whitequark"emoji" is the name of the character set, just like "cyrillic" and "kanji" and "kana" are
19:05.58viricah ok
19:06.28whitequarkhttp://www.unicode.org/charts/PDF/U1F300.pdf
19:06.31whitequarkone big WTF
19:06.58whitequarke.g. such pearls as
19:07.06whitequark"BABY CHICK" and "FRONT-FACING BABY CHICK"
19:07.28whitequarkand different characters for "DROMEDARY CAMEL" and "BACTRIAN CAMEL".
19:07.55viricbasic.
19:07.58whitequarkand "EXTRATERRESTIAL ALIEN" and "ALIEN MONSTER"
19:08.12viricWell, when people can't embed tetris into their products, they do these things
19:08.22viricwill there be unicode characters for tetris pieces? who knows
19:08.37whitequarkI'm pretty sure there are already
19:08.39whitequarklet me check...
19:09.10whitequarkmeh, no. what a pity. I'll consider submitting a proposal.
19:10.34viricthank you :)
19:11.38viricdo you remember the DOS characters that allowed a mode like 160x120 or so, on text mode?
19:12.01virichalf vertical, half horizontal, corners...
19:12.19viricI wonder what resolution unicode allows.
19:22.01whitequarkit's not specified in any way
19:22.06whitequarkUnicode is just a list of codepoints
19:22.14whitequarki.e. "an algorithm"
19:22.18whitequarka font is an "implementation"
19:22.42viricok
19:22.48viricwhether it is a bitmap font, or vector font.
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20:04.47viricts
20:04.49viricoops
20:23.57qi-bot[commit] Werner Almesberger: fisl2012/: add kicad cvpcb diagram (master) http://qi-hw.com/p/wernermisc/2fc3b97
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23:46.39kristianpaulwpwrak: btw about capacitor i noticed you set cap value in F/RF in atben for some of then
23:46.45kristianpauldo you have another specific notation i should be aware.....

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