Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs
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<kristianpaul> he, i wonder why eeschma always warms when having another running instance of it
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<qi-bot> Jon 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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<roh> .o(well.. DUH!)
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<qi-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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<wpwrak> all quiet in qi-land :)
<larsc> how was your talk?
<kristianpaul> did you recorded it?
<kristianpaul> wpwrak: btw about capacitor i noticed you se cap value/RF in atben for some of then
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<kristianpaul> do you have another specific notation i should be aware.....
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<viric> What is likely to shorten the life of electrolithic capacitors?
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<larsc> a hammer!
<viric> :)
<viric> this sheeveaplug power supply...
<viric> blew up the capacitors again
<larsc> again?
<viric> every year or half a year, time to replace some big capacitors
<larsc> oh
<viric> maybe I should understand the circuit instead of simply replacing them
<viric> if it were open hardware... :)
<roh> viric: gets to hot.
<Ayla> use capacitors that support a higher Volt value
<viric> I thought of that
<viric> it's an easy parameter to change
<viric> but a bit hard to make all fit in the case :)
<roh> well.. its a design flaw
<viric> one is 450V :)
<viric> yes sure
<viric> but I don't know th fix
<viric> the fix
<roh> thats the loading cap for the primary side
<roh> there is no fix afaik
<viric> well, last time it blew up (not the 1st time)
<roh> s/loading/charging
<viric> now it's another one, smaller
<viric> 16V
<roh> caps derate at high temperatures
<viric> until 105°C all say
<roh> also high rf currents can make similar effects. thats why low-esr is important in psu
<roh> 105 is the higher one of 2 usual cap ratings. doesnt mean they survive long at such temps
<roh> usually it should be way below 60deg C in there.
<viric> on summer it gets far hotter
<viric> in the box. :)
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<viric> so it's like something needs good ventilation.
<roh> maybe you can modify it to use a external supply. how many and which secondary voltages does the psu do?
<roh> 5V? 3.3?
<viric> only 5V
<roh> well.. then just remove the psu and add a barrel conn.
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<viric> 1amp though.
<viric> or 2.
<viric> let's say 2.
<roh> well.. measure it and use a properly overspec-ed psu
<roh> i guess a 2A psu will do fine. after all its just a 10W or so device
<viric> I know it takes ~7W from 22V
<viric> I know it takes ~7W from 220V
<viric> I'll have to do that..
<viric> I found a power supply at home that has a usb port 5V/2A, it says.
<qi-bot> [commit] Werner Almesberger: fisl2012/: fix some typos (master) http://qi-hw.com/p/wernermisc/c52e2b9
<qi-bot> [commit] Werner Almesberger: fisl2012/: add kicad schematics diagram; trim Makefile (master) http://qi-hw.com/p/wernermisc/d5a0a83
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<whitequark> also, reverse polarization
<whitequark> oh, I see, not the case here
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<viric> no, I think it's not the case
<viric> I thought reverse polarization would make them blow quickly
<viric> :)
<whitequark> not necessarily
<whitequark> suppose they're reverse polarized by -5V for 1% of the time
<whitequark> (if the input voltage is 220V)
<viric> as in... мгновенно
<whitequark> heh
<viric> ok
<viric> for me it's very hard to pronounce 'мгн'.
<whitequark> what's your first language?
<viric> which reminds me that today I encountered a unicode character for MHz.
<viric> catalan.
<whitequark> mhm
<viric> who thought of a single character for MHz? weird.
<whitequark> what's your reason for learning Russian?..
<viric> I wonder how much more like that there are.
<whitequark> (MHz) that's Unicode, they have lots of weird stuff
<viric> looks like so.
<whitequark> e.g. emoji. a single character for "tanabata sunrise" or something like that, I don't quite recall
<viric> as 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
<whitequark> and it's not a kanji character; it's a pictogram which is only used by emoji
<viric> is emoji the name of something?
<viric> or your explanation looks to me a bit recursive?
<whitequark> "emoji" is the name of the character set, just like "cyrillic" and "kanji" and "kana" are
<viric> ah ok
<whitequark> one big WTF
<whitequark> e.g. such pearls as
<whitequark> "BABY CHICK" and "FRONT-FACING BABY CHICK"
<whitequark> and different characters for "DROMEDARY CAMEL" and "BACTRIAN CAMEL".
<viric> basic.
<whitequark> and "EXTRATERRESTIAL ALIEN" and "ALIEN MONSTER"
<viric> Well, when people can't embed tetris into their products, they do these things
<viric> will there be unicode characters for tetris pieces? who knows
<whitequark> I'm pretty sure there are already
<whitequark> let me check...
<whitequark> meh, no. what a pity. I'll consider submitting a proposal.
<viric> thank you :)
<viric> do you remember the DOS characters that allowed a mode like 160x120 or so, on text mode?
<viric> half vertical, half horizontal, corners...
<viric> I wonder what resolution unicode allows.
<whitequark> it's not specified in any way
<whitequark> Unicode is just a list of codepoints
<whitequark> i.e. "an algorithm"
<whitequark> a font is an "implementation"
<viric> ok
<viric> whether it is a bitmap font, or vector font.
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<viric> ts
<viric> oops
<qi-bot> [commit] Werner Almesberger: fisl2012/: add kicad cvpcb diagram (master) http://qi-hw.com/p/wernermisc/2fc3b97
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<kristianpaul> wpwrak: btw about capacitor i noticed you set cap value in F/RF in atben for some of then
<kristianpaul> do you have another specific notation i should be aware.....
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