2014-06-02 03:51 nicksydney has joined #qi-hardware 2014-06-02 05:27 rz2k has joined #qi-hardware 2014-06-02 05:36 wolfspraul has joined #qi-hardware 2014-06-02 06:02 jluis has joined #qi-hardware 2014-06-02 06:40 jekhor has joined #qi-hardware 2014-06-02 06:42 michael_lee has joined #qi-hardware 2014-06-02 06:51 what the fuck. 2014-06-02 06:51 silicone didn't work, and I have just learned why 2014-06-02 06:52 because the water chamber is not actually welded shut, it's snap-on, like the motor chamber 2014-06-02 06:52 *of course* that shit leaks 2014-06-02 06:53 jekhor has quit [Ping timeout: 240 seconds] 2014-06-02 07:07 jekhor has joined #qi-hardware 2014-06-02 07:20 pcercuei has joined #qi-hardware 2014-06-02 08:44 sb0 has joined #qi-hardware 2014-06-02 09:05 FDCX_ has quit [Ping timeout: 265 seconds] 2014-06-02 09:34 xiangfu has joined #qi-hardware 2014-06-02 10:16 FDCX has joined #qi-hardware 2014-06-02 10:23 FDCX has quit [Ping timeout: 265 seconds] 2014-06-02 10:25 FDCX has joined #qi-hardware 2014-06-02 10:57 jekhor has quit [Ping timeout: 240 seconds] 2014-06-02 11:40 wolfspraul has quit [Quit: leaving] 2014-06-02 12:10 jekhor has joined #qi-hardware 2014-06-02 12:14 xiangfu has quit [Remote host closed the connection] 2014-06-02 12:15 xiangfu has joined #qi-hardware 2014-06-02 12:26 jekhor has quit [Ping timeout: 252 seconds] 2014-06-02 12:37 pcercuei has quit [Ping timeout: 240 seconds] 2014-06-02 12:49 whee, 2nd issue of c't hacks 2014-06-02 12:50 also I've put a lot of the silicone over the latch of the water chamber and then closed it. it worked, it no longer leaks 2014-06-02 12:52 more silicone helps more. it's just a question of quantity until nothing could possibly leak anymore. 2014-06-02 12:53 alternatively, encase it in a solid block of epoxy 2014-06-02 12:53 no joke; that's how soviet military electronics was actually processed 2014-06-02 12:54 they even developed a special kind of epoxy which negligibly shrinks during curing, so that it wouldn't tear components off 2014-06-02 12:54 must be hell to change those tubes ... 2014-06-02 12:54 or do they still use relays ? 2014-06-02 12:54 meh 2014-06-02 12:55 soviet integrated circuits. biggest integrated circuits in the world 2014-06-02 12:55 usually encased in ceramic & with a shitload of gold on the pins 2014-06-02 12:55 you could literally sell a few ICs and buy a nice car 2014-06-02 12:55 FDCX has quit [Remote host closed the connection] 2014-06-02 12:55 Au, Pt, Pd, Ir, sometimes even more rare stuff 2014-06-02 12:56 like this: http://files.radioscanner.ru/uploader/2009/119un2.jpg 2014-06-02 12:56 "one IC contains 19,4737mg of Au" 2014-06-02 12:58 or this, for soviet PDP-type machine: http://patlah.ru/etm/etm-01/dom-promsl/uvelir/zoloto%20othod/zoloto-othod-08-04.gif 2014-06-02 12:58 that's in *grams* 2014-06-02 12:59 they indicate the gold content in the datasheet? 2014-06-02 12:59 or is this not a datasheet? 2014-06-02 12:59 it's a datasheet 2014-06-02 12:59 a part of it 2014-06-02 12:59 FDCX has joined #qi-hardware 2014-06-02 13:00 would be fun to visit the fabs :) 2014-06-02 13:01 well, you'd have to get a time machine first 2014-06-02 13:03 wolfspraul has joined #qi-hardware 2014-06-02 13:24 DocScrutinizer05: you asked about raster's whereabouts. i guess this may explain it: www.heise.de/newsticker/meldung/Samsung-Z-Das-erste-Smartphone-mit-Tizen-statt-Android-ist-fertig-2213903.html 2014-06-02 13:24 and this https://www.tizen.org/events/presentations/tizen-native-display-layer-efl-architecture-and-usage 2014-06-02 13:24 eugh 2014-06-02 13:25 (in german, "tizen" immediately draws your mind towards "tits". there are two words, "titten" and "zitzen", both meaning that) 2014-06-02 13:26 hehe 2014-06-02 13:26 I always grab my ear when I read "Tizen" 2014-06-02 13:27 also not exactly a lucky association 2014-06-02 13:28 http://www.google.de/search?hl=en-DE&source=hp&q=mike+tyson+ear+bit 2014-06-02 13:28 http://www.youtube.com/watch?v=Wkx3NCv2XKg 2014-06-02 13:32 ouch ! 2014-06-02 13:32 whitequark, I suspect some are still around :) 2014-06-02 13:33 but I can say for a fact that *no* precious metals have survived for more than like 2014-06-02 13:33 ten minutes after the fall of ussr 2014-06-02 13:33 I know a fab near Warsaw that still uses a lot of USSR-era equipment 2014-06-02 13:33 including large oil diffusion pumps etc. 2014-06-02 13:33 maybe mercury, even :) 2014-06-02 13:33 mmm, pumps 2014-06-02 13:34 mercury isn't really precious 2014-06-02 13:34 (it's been on my todo-list for a while, but I'm never in Poland at the right time) 2014-06-02 13:36 and I don't mean for the precious metals, just for the vacuum/electronic porn 2014-06-02 13:49 xiangfu has quit [Quit: leaving] 2014-06-02 13:57 wolfspraul has quit [Quit: leaving] 2014-06-02 14:09 pcercuei has joined #qi-hardware 2014-06-02 14:46 wolfspraul has joined #qi-hardware 2014-06-02 15:10 Luke-Jr has quit [Read error: Connection reset by peer] 2014-06-02 15:12 Luke-Jr has joined #qi-hardware 2014-06-02 15:29 what's a good way to make a constant-current regulator for 1A? 2014-06-02 15:29 lm317? 2014-06-02 15:33 hm, no, that'd dissipate at least 3W 2014-06-02 15:45 STCS1A ? 2014-06-02 16:06 pcercuei has quit [Ping timeout: 265 seconds] 2014-06-02 16:39 jekhor has joined #qi-hardware 2014-06-02 16:43 michael_lee has quit [Quit: Ex-Chat] 2014-06-02 16:55 rz2k has quit [] 2014-06-02 17:23 jekhor has quit [Ping timeout: 265 seconds] 2014-06-02 17:24 ysionneau: oh great 2014-06-02 17:37 ysionneau: oh actually not, I can't find anywhere to buy it in RU 2014-06-02 17:38 not even "not in stock" 2014-06-02 17:46 though nevermind, I just realized I have digikey covered 2014-06-02 17:46 and DK has it in stock 2014-06-02 17:48 what do you need this regulator for? 2014-06-02 17:49 just curious 2014-06-02 17:49 sb0: I have 24V input and I want to power a water (coolant) pump for my CNC mill 2014-06-02 17:50 at about 1A it works best 2014-06-02 17:50 constant voltage isn't good? 2014-06-02 17:51 I dunno actually 2014-06-02 17:52 they're probably more or less equivalent 2014-06-02 17:52 in this case 2014-06-02 17:52 and what happens at max voltage? 2014-06-02 17:53 you mean at 24V? 2014-06-02 17:53 the problem with driving a DC motor with constant current is that if you reduce the load (torque), the voltage and speed will go up 2014-06-02 17:53 yes 2014-06-02 17:53 oh 2014-06-02 17:53 oh you're right. 2014-06-02 17:53 if you run out of water, won't it make the motor spin too fast? 2014-06-02 17:53 I need constant voltage here 2014-06-02 17:53 it will, and it'll burn 2014-06-02 17:54 that should be easy to fix. even an arduino could do that ;-) 2014-06-02 17:56 the problem with pure constant voltage is the current spike at startup, when the motor isn't already spinning 2014-06-02 17:57 but in some cases, the circuit's resistance is enough to keep that current within a reasonable value 2014-06-02 17:57 of course, if you block the motor then, the current will stay high 2014-06-02 17:57 so have a controller. monitor voltage. on start, allow for inrush current. then limit voltage (probably needs a low-pass filter). if it gets too high, uncommanded, emergency shutdown. 2014-06-02 17:58 and yes, maybe also if the voltage gets too low :) 2014-06-02 17:59 motors are inductive too, which helps limit the inrush current 2014-06-02 18:00 so in a lot of cases, constant-voltage is the best simple solution :) 2014-06-02 18:00 you can also add a slow-acting fuse ... 2014-06-02 18:02 i guess you want to control both - current and voltage. regulate one, monitor the other. then you can detect any problems and just cut off. at least that's the theory :) 2014-06-02 18:03 so contrived 2014-06-02 18:03 in russia, it's normal for motors to burn 2014-06-02 18:29 FDCX has quit [Remote host closed the connection] 2014-06-02 18:30 FDCX has joined #qi-hardware 2014-06-02 18:44 jekhor has joined #qi-hardware 2014-06-02 20:55 wolfspraul has quit [Quit: leaving] 2014-06-02 21:08 use a constant voltage with current limiting, and possibly even softstart. All available in very common cheap and simple regulator chips 2014-06-02 21:08 usually with 3 pins 2014-06-02 21:09 maybe for this usecase you prefer a 5pin version, that allows separate control for current limit and softstart 2014-06-02 21:10 the 3 pin versions do no softstart and current limit is usually "hardcoded" and foldback characteristics which you don't really want 2014-06-02 21:12 but actually you might get away with very convenient PWM on 50%, which doesn't even need any heatsink 2014-06-02 21:13 since the motor is inductive, you only need a oscillator driving a power mosfet, and a clamp diode 2014-06-02 21:21 http://www.ti.com/lsds/ti/power-management/pwm-resonant-controller-products.page might give you some ideas 2014-06-02 21:25 http://www.ti.com/general/docs/datasheetdiagram.tsp?genericPartNumber=UCC28722&diagramId=SLUSBL7A 2014-06-02 21:30 of course you also could use a NE555 and a FET ;-) (sounds familiar, eh?) 2014-06-02 21:35 jekhor has quit [Ping timeout: 240 seconds] 2014-06-02 22:10 pcercueiS2 has joined #qi-hardware 2014-06-02 22:14 pcercueiS2 has quit [Ping timeout: 245 seconds] 2014-06-02 22:33 sb0 has quit [Quit: Leaving]