#qi-hardware on 2014-08-30 — irc logs at freenode.irclog.whitequark.org

2013-02-28 15:16 DocScrutinizer05 changed the topic of #qi-hardware to: 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 and http://irclog.whitequark.org/qi-hardware

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07:24 <larsc> if you just rename it to #qi people will be asking about feng shui and stuff

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08:53 <kyak> random questions about hardware from strangers don't come in too often to bother about it.. in some cases those questions even lead to follow up discussions :)

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10:21 <wpwrak> larsc: would they get 4q4i4!4 then ? or would this attract asianophile necromancers ?

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14:08 <larsc> interestingly nobody asked about the best alignment for components on a PCB yet

14:11 <wpwrak> too technical :)

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21:33 <DocScrutinizer05> this maybe too: searching for data about a SOT23-5 marked "SC" or "S.C" (see http://maemo.cloud-7.de/share-service/20140830_002.jpg) Googling and http://chip.tomsk.ru/chip/chipdoc.nsf/vc1!readform&view=smd&cat=S&start=2001&count=500 didn't help so far. Any tips?

21:36 <DocScrutinizer05> when you're desperate, aliexpress at least gives you a laugh: http://www.aliexpress.com/store/product/SOT23-5-Transistors-Mark-Marking-Code-SC-TOS-15PCS-LOTS/1041954_1815374051.html

21:45 <whitequark> DocScrutinizer05: I've once tried to find small SMD actives by markings

21:45 <whitequark> came to the conclusion that for maybe 95% this is futile

21:45 <DocScrutinizer05> well, I managed to find ~80% to 90% of chips in N900

21:46 <whitequark> huh

21:46 <DocScrutinizer05> however for sot23 with just 2 char mark it's pretty hard

21:46 <whitequark> lucky I guess

21:46 <DocScrutinizer05> might be pbsolete as well

21:46 <DocScrutinizer05> TOS suggests toshiba

21:47 <DocScrutinizer05> circuit suggests it's a 2transistor compound component

21:48 <DocScrutinizer05> http://wstaw.org/m/2014/08/30/plasma-desktopVS1987.png the "amp5p" pinout as on http://maemo.cloud-7.de/share-service/20140830_002.jpg SOT23

21:48 <DocScrutinizer05> internal is of course nonsense

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21:49 <DocScrutinizer05> *could* also be an opamp

21:51 <DocScrutinizer05> anyway it has a V+, GND pin, one output, and obviously a noninverting and an inverting input

21:52 <DocScrutinizer05> and it's not supposed to pull significan power form V+, since the device is coin cell powered

21:53 <DocScrutinizer05> R1=R2=R3=2M2 suggests it *might* be a dual-FET

21:57 <DocScrutinizer05> maybe assuming this pinout of the SOT23 makes more sense: http://wstaw.org/m/2014/08/30/plasma-desktopRT1987.png

22:00 <DocScrutinizer05> or the whole friggin thing is a 800..900MHz filter ;-P

22:01 <DocScrutinizer05> http://maemo.cloud-7.de/share-service/20140830_002.jpg is a phone call ring detector

22:01 <DocScrutinizer05> ancient one

22:01 <DocScrutinizer05> detects 850..900MHz, maybe even 1800..1900MHz

22:02 <DocScrutinizer05> L1 is that ballpen spring "plugged" onto the LED in the middle

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