2015-04-17 00:23 rjeffries_ has joined #qi-hardware 2015-04-17 01:43 Haswell has quit [Quit: Saliendo] 2015-04-17 01:47 archang has joined #qi-hardware 2015-04-17 01:57 atommann has joined #qi-hardware 2015-04-17 02:21 fengling has joined #qi-hardware 2015-04-17 03:32 archang has quit [Ping timeout: 265 seconds] 2015-04-17 04:05 rjeffries has quit [Ping timeout: 244 seconds] 2015-04-17 04:05 rjeffries has joined #qi-hardware 2015-04-17 04:07 archang has joined #qi-hardware 2015-04-17 04:15 rjeffries_ has quit [Ping timeout: 245 seconds] 2015-04-17 04:20 xiangfu has joined #qi-hardware 2015-04-17 04:48 atommann has quit [Ping timeout: 246 seconds] 2015-04-17 06:40 rjeffries has quit [Ping timeout: 248 seconds] 2015-04-17 06:41 rjeffries has joined #qi-hardware 2015-04-17 07:14 fmeerkoetter has joined #qi-hardware 2015-04-17 07:41 rjeffries_ has joined #qi-hardware 2015-04-17 07:53 pcercuei has joined #qi-hardware 2015-04-17 08:25 rjeffries has quit [Ping timeout: 245 seconds] 2015-04-17 08:25 rjeffries has joined #qi-hardware 2015-04-17 09:11 wolfspraul has joined #qi-hardware 2015-04-17 09:30 rjeffries_ has quit [Ping timeout: 264 seconds] 2015-04-17 09:58 xiangfu has quit [Remote host closed the connection] 2015-04-17 10:03 atommann has joined #qi-hardware 2015-04-17 10:38 fengling has quit [Ping timeout: 256 seconds] 2015-04-17 10:40 atommann has quit [Quit: Leaving] 2015-04-17 10:47 fengling has joined #qi-hardware 2015-04-17 10:57 fengling has quit [Quit: WeeChat 1.1.1] 2015-04-17 11:26 wolfspraul has quit [Ping timeout: 272 seconds] 2015-04-17 14:14 rjeffries_ has joined #qi-hardware 2015-04-17 14:33 nicksydney has quit [Remote host closed the connection] 2015-04-17 15:50 fmeerkoetter has quit [Ping timeout: 264 seconds] 2015-04-17 16:05 rjeffries has quit [Ping timeout: 240 seconds] 2015-04-17 16:19 rjeffries has joined #qi-hardware 2015-04-17 16:29 rjeffries_ has quit [Ping timeout: 272 seconds] 2015-04-17 16:46 FDCX_ has joined #qi-hardware 2015-04-17 16:54 pcercuei has quit [Ping timeout: 264 seconds] 2015-04-17 17:02 Haswell has joined #qi-hardware 2015-04-17 17:14 rjeffries_ has joined #qi-hardware 2015-04-17 18:13 testing hot: http://wstaw.org/m/2015/04/17/plasma-desktopdH1954.png http://wstaw.org/m/2015/04/17/plasma-desktopls1954.png 35min already, PC and moni, not bad 2015-04-17 18:32 kristianpaul has quit [Quit: leaving] 2015-04-17 18:37 1h http://wstaw.org/m/2015/04/17/plasma-desktopTf1954.png 2015-04-17 18:38 * DocScrutinizer05 should attach a hair dryer :-) 2015-04-17 18:41 alas the mein purpose of this little experiment failed: heat UPS up a bit to boil out that nasty PVC smell - but thanks to built-in fan starting as soon as PSU operates in battery-powered mode, the whole device got *cooler* instead warmer 2015-04-17 18:41 main* 2015-04-17 18:42 kristianpaul has joined #qi-hardware 2015-04-17 18:42 kristianpaul has joined #qi-hardware 2015-04-17 18:43 another funny sidenote: first 19% of shown battery capacity vanished during first 60s of operation, after 120s it been down to 77% and then eventually even recovered to 78% after a few minutes 2015-04-17 18:44 pcercuei has joined #qi-hardware 2015-04-17 18:45 * whitequark just got around fixing the lab PSU 2015-04-17 18:46 the damn chinese have screwed a heatsink mounting screw to a PCB so tight it went through the mask 2015-04-17 18:46 and of course, the screw has touched a conductor at +15V, rectified right from the transformer 2015-04-17 18:46 wow! 2015-04-17 18:47 thus putting the PSU ground at... -15V from PSU - 2015-04-17 18:47 then, I decided I should for once do all correctly and plugged in both PSU and scope into a socket with actual ground prongs. 2015-04-17 18:47 and connected scope ground to PSU -. 2015-04-17 18:47 the wire went white hot 2015-04-17 18:48 the PSU amp meter just sat there at 999 2015-04-17 18:48 who the *fuck* lays out their PCB like that 2015-04-17 18:48 sounds almost as nasty as my universal laptop et al PSU with the PCB throughhole solder points sitting straight on a 0.2mm plastic film on top of the alu heatsink 2015-04-17 18:48 ... that is in fact how I fixed it, I put mylar film between that screw and PCB :D 2015-04-17 18:49 no pointy things near though, so it should be fine 2015-04-17 18:49 you seen the photos of mine, do you? 2015-04-17 18:49 yeah you told me 2015-04-17 18:50 I also don't understand the love of these chinese vendors for heavy transformers 2015-04-17 18:50 ugh, this UPS makes funny noises 2015-04-17 18:50 the PSU doesn't have a single FET, non-through-hole component, two-layer PCB, or even FR-4 inside 2015-04-17 18:50 transformers are easy to understand and build 2015-04-17 18:50 ;-) 2015-04-17 18:51 seriously, that thing would cost half as much to ship 2015-04-17 18:51 had it been built as SMPS 2015-04-17 18:51 sure 2015-04-17 18:51 I wonder if they heard that power FETs exist 2015-04-17 18:52 It sure doens't look like so, glancing at the PCBs 2015-04-17 18:52 the LEDs have a metal mesh put at them, to emulate that VFD display feel 2015-04-17 18:52 I wonder if they revised the circuit since 1982 or not 2015-04-17 18:52 Probably not 2015-04-17 18:53 not 2015-04-17 18:53 it works ;-) 2015-04-17 18:53 FDCX_ has quit [Ping timeout: 276 seconds] 2015-04-17 18:53 and 34 monkeys got killed during R&D ;-P 2015-04-17 18:59 I told you about that russian mini bench vice I had in 1975 or so? which had spackle filler all over it and when that came off due to an occasional hammer hit that missed the target, the steel under it had a shape like Hephaestus had hangover when smithing it 2015-04-17 19:01 lol 2015-04-17 19:01 no you didn't 2015-04-17 19:01 but that sounds about right 2015-04-17 19:01 I wouldn't be surprised if the smith literally had a hangover 2015-04-17 19:06 http://wstaw.org/m/2015/04/17/plasma-desktopqY1954.png after 90min. note the shown load percentage which now jitters between 9% and 11%, with load unchanged. at start is was jittering between 6 and 8 2015-04-17 19:06 voltage is also quite a bit jittery, even more on device display than on web interface 2015-04-17 19:07 but hey, PC and monitor are happy since 90 min already 2015-04-17 19:07 eh, doubt the SMPS would care 2015-04-17 19:07 obviously ;-) 2015-04-17 19:08 they'd work like down to 90V from 220V, a dozen or so jitter is nothing 2015-04-17 19:08 ^^^ another reason everything should use SMPS, damnit 2015-04-17 19:08 * DocScrutinizer05 picks his decent Fluke DMM 2015-04-17 19:08 err Agilent 2015-04-17 19:10 what I thought, a rock solid 233.[7-9]Vrms 2015-04-17 19:10 ooh nope, 233.4 now 2015-04-17 19:11 PSU display jerks between 229 and 231 2015-04-17 19:12 err now it goes quite jerky even on DMM 2015-04-17 19:13 idle thought: many (but I think not all) SMPS PSUs rectify everything right away 2015-04-17 19:13 so you could basically power them with 300 VDC or so 2015-04-17 19:13 yes, most do 2015-04-17 19:14 I've seen some truly bizarre schematics for PC ATX PSUs 2015-04-17 19:14 lemme find it 2015-04-17 19:16 ok, one thing's for sure: I don't need the 10s periodic beep to remind me the UPS works on battery mode. The snare and hum it produces is quite enough so I won't forget about it 2015-04-17 19:17 http://www.pavouk.org/hw/atxps.png 2015-04-17 19:17 LOL 2015-04-17 19:17 wolfspraul has joined #qi-hardware 2015-04-17 19:18 ouch, zilch inrush current limiting before the 470u 2015-04-17 19:18 oops nope there's a NTC, almost missted it 2015-04-17 19:19 look above D14 2015-04-17 19:19 the fuck that trafo is doing? 2015-04-17 19:22 wonding 2015-04-17 19:22 wondering 2015-04-17 19:22 maybe sort of primary feedback 2015-04-17 19:23 8-9-10-11 of TL494 is C1 E1 E2 C2 of its output transistors 2015-04-17 19:24 actually I guess the winding next to R4 is doing a positive feedback that keept whichever transistor conducting until C7 chharged and current through C7-T3-T2 begins to decay 2015-04-17 19:24 I'm told this transformer does three things at once, it provides feedback for the overcurrent protection 2015-04-17 19:24 it allows control of the transistors on the primary side 2015-04-17 19:25 overcurrent limiting might be another possibility, though it wouldn't work well for that 2015-04-17 19:25 and it does a sort of autogeneration with a controlled transition 2015-04-17 19:25 all at once 2015-04-17 19:26 actually with C7 there can't be much of any overcurrent 2015-04-17 19:26 rodgort has quit [Ping timeout: 272 seconds] 2015-04-17 19:26 more like secondary side overcurrent 2015-04-17 19:27 TL494 will increase duty cycle based on feedback, and at some point it'll exceed primary side specifications 2015-04-17 19:27 nah it's a positive feedback 2015-04-17 19:27 hm 2015-04-17 19:27 nasty: no overvoltage protection on secondary side, at all 2015-04-17 19:28 unno, maybe. my brain hurts trying to decipher this circuit, with the primary coming through the control trafo 2015-04-17 19:30 the whole voltage stabilization is a pathetic joke 2015-04-17 19:32 rodgort has joined #qi-hardware 2015-04-17 19:33 *my* brain hurts trying to decode ZIC1 TL431C lower right 2015-04-17 19:33 they're doing something pretty weird for 3V3 "stabilization" there 2015-04-17 19:33 haha wow 2015-04-17 19:38 OOOH THERE is the stabilization, all to the 2015-04-17 19:38 ~ping 2015-04-17 19:38 ~pong 2015-04-17 19:39 wow, UPS just cut me out without prior notice 2015-04-17 19:39 OOOH THERE is the stabilization, all to the way to the left 2015-04-17 19:40 http://wstaw.org/m/2015/04/17/plasma-desktopKq1954.png 2015-04-17 19:40 left? 2015-04-17 19:43 DocScrutinizer05 has quit [Disconnected by services] 2015-04-17 19:43 DocScrutinizer05 has joined #qi-hardware 2015-04-17 19:54 FFS 2015-04-17 19:56 the PC went down to suspend-to-disk, but when I plugged in UPS to mains and then started up PC again, a ~90s(?) later the UPS went into shutdown mode nevertheless (some hickup from before in either the control sw on PC or the UPS itself, thinking it's still in shutdown procedure) and that of course killed off the PC cold, without suspend to disk 2015-04-17 19:56 HAHA 2015-04-17 19:57 [Fri 17 April 2015] [21:39:38] OOOH THERE is the stabilization, all to the way to the left 2015-04-17 19:58 is last in IRC log. I thought I sent more, but that got lost in disk cache I guess 2015-04-17 20:05 UPS, always good for an unsolicited shutdown ;-) 2015-04-17 20:08 http://lab.whitequark.org/images/psu-short/short.jpeg 2015-04-17 20:09 LOL 2015-04-17 20:10 as I have said 2015-04-17 20:10 who the fuck lays PCBs out like that 2015-04-17 20:11 nfc 2015-04-17 20:44 rjeffries has quit [Ping timeout: 265 seconds] 2015-04-17 20:44 rjeffries has joined #qi-hardware 2015-04-17 20:57 Jay7x has joined #qi-hardware 2015-04-17 20:57 wolfspraul has quit [Quit: leaving] 2015-04-17 20:58 rjeffries_ has quit [Ping timeout: 276 seconds] 2015-04-17 20:59 Jay7 has quit [Read error: Connection reset by peer] 2015-04-17 20:59 wpwrak has quit [Ping timeout: 264 seconds] 2015-04-17 21:00 wpwrak has joined #qi-hardware 2015-04-17 21:52 wpwrak has quit [Ping timeout: 256 seconds] 2015-04-17 21:52 wpwrak has joined #qi-hardware 2015-04-17 23:11 xiangfu has joined #qi-hardware 2015-04-17 23:12 xiangfu has quit [Remote host closed the connection] 2015-04-17 23:32 pcercuei has quit [Ping timeout: 272 seconds]