#qi-hardware IRC log for Saturday, 2014-08-30

larscif you just rename it to #qi people will be asking about feng shui and stuff07:24
kyakrandom 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 :)08:53
wpwraklarsc: would they get 4q4i4!4 then ? or would this attract asianophile necromancers ?10:21
larscinterestingly nobody asked about the best alignment for components on a PCB yet14:08
wpwraktoo technical :)14:11
DocScrutinizer05this 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?21:33
DocScrutinizer05when 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.html21:36
whitequarkDocScrutinizer05: I've once tried to find small SMD actives by markings21:45
whitequarkcame to the conclusion that for maybe 95% this is futile21:45
DocScrutinizer05well, I managed to find ~80% to 90% of chips in N90021:45
DocScrutinizer05however for sot23 with just 2 char mark it's pretty hard21:46
whitequarklucky I guess21:46
DocScrutinizer05might be pbsolete as well21:46
DocScrutinizer05TOS suggests toshiba21:46
DocScrutinizer05circuit suggests it's a 2transistor compound component21:47
DocScrutinizer05http://wstaw.org/m/2014/08/30/plasma-desktopVS1987.png the "amp5p" pinout as on http://maemo.cloud-7.de/share-service/20140830_002.jpg SOT2321:48
DocScrutinizer05internal is of course nonsense21:48
DocScrutinizer05*could* also be an opamp21:49
DocScrutinizer05anyway it has a V+, GND pin, one output, and obviously a noninverting and an inverting input21:51
DocScrutinizer05and it's not supposed to pull significan power form V+, since the device is coin cell powered21:52
DocScrutinizer05R1=R2=R3=2M2 suggests it *might* be a dual-FET21:53
DocScrutinizer05maybe assuming this pinout of the SOT23 makes more sense: http://wstaw.org/m/2014/08/30/plasma-desktopRT1987.png21:57
DocScrutinizer05or the whole friggin thing is a 800..900MHz filter ;-P22:00
DocScrutinizer05http://maemo.cloud-7.de/share-service/20140830_002.jpg is a phone call ring detector22:01
DocScrutinizer05ancient one22:01
DocScrutinizer05detects 850..900MHz, maybe even 1800..1900MHz22:01
DocScrutinizer05L1 is that ballpen spring "plugged" onto the LED in the middle22:02
--- Sun Aug 31 201400:00

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