| larsc | if you just rename it to #qi people will be asking about feng shui and stuff | 07:24 |
|---|---|---|
| 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 :) | 08:53 |
| wpwrak | larsc: would they get 4q4i4!4 then ? or would this attract asianophile necromancers ? | 10:21 |
| larsc | interestingly nobody asked about the best alignment for components on a PCB yet | 14:08 |
| wpwrak | too technical :) | 14:11 |
| 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? | 21:33 |
| 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 | 21:36 |
| 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 | 21:45 |
| 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 | 21:46 |
| DocScrutinizer05 | circuit suggests it's a 2transistor compound component | 21:47 |
| 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 | 21:48 |
| DocScrutinizer05 | *could* also be an opamp | 21:49 |
| DocScrutinizer05 | anyway it has a V+, GND pin, one output, and obviously a noninverting and an inverting input | 21:51 |
| DocScrutinizer05 | and it's not supposed to pull significan power form V+, since the device is coin cell powered | 21:52 |
| DocScrutinizer05 | R1=R2=R3=2M2 suggests it *might* be a dual-FET | 21:53 |
| DocScrutinizer05 | maybe assuming this pinout of the SOT23 makes more sense: http://wstaw.org/m/2014/08/30/plasma-desktopRT1987.png | 21:57 |
| DocScrutinizer05 | or the whole friggin thing is a 800..900MHz filter ;-P | 22:00 |
| 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 | 22:01 |
| DocScrutinizer05 | L1 is that ballpen spring "plugged" onto the LED in the middle | 22:02 |
| --- Sun Aug 31 2014 | 00:00 | |
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