#qi-hardware IRC log for Friday, 2011-10-14

whitequarkI guess the amount of flux was too low. I should have been submerged it entirely.00:00
whitequarkwpwrak: any ideas of soldering 8WSON correctly?00:03
whitequarknevermind, it exploded00:13
wpwrakleave exposed copper outside the chip. pre-tin pads and traces. ...00:13
wpwrakah yes, bake ;-)00:14
whitequarkah, that was not the chip00:14
whitequarkit was a tantalum cap00:14
whitequarkthe polarity _WAS_ correct00:14
wpwraksee, that wouldn't have happened with an LDO ;-)00:14
whitequarkno, really00:15
whitequarkit quite definitely was correct00:15
whitequarkwhy has that happened?00:15
whitequarkthe voltage is fine, too: cap is rated 25V, and I only give it 5V00:15
wpwrakreplace and try again ?00:16
whitequarkyeah, tomorrow00:16
whitequarkif I'll do it now, I will fry everything that is still possibly alive00:16
whitequarkfffuuuu~~~. such a smell.00:17
whitequarkthe blast was nice, through. a bright flash, a loud clicking sound, a red-hot capacitor and a lot of crap spread on the boar00:18
whitequarkam I correct that the red line on a yellow tantalum cap marks the positive electrode?00:19
wpwrakgood that you weren't examining anything nearby at the time00:19
wpwrakcheck the data sheet :)00:19
whitequarkI don't have one00:20
whitequarkas the cap was bought in Russia00:20
whitequarkthey've only state the manufacturer00:20
wpwrakthen assume the next time it's negative ;-)))00:20
whitequarkit is "China".00:20
whitequark>This is why using tantalum capacitors in a power supply or for supply decoupling is not a good idea. Even when they are connected the right way round they can fail short circuit and burn like that.00:23
whitequarkbut they were recommended by TI in the step-down DS00:23
whitequarkTI probably didn't mean Russian ones, I guess.00:24
wpwraki'm beginning to understand why the west was so afraid of you guys ;-)00:25
xiangfujust double checked. we HAVE TO put the lockflash to the end of jtag command series.03:01
xiangfuwpwrak, thanks. :)03:02
xiangfuwrong channel.03:23
qi-bot[commit] Werner Almesberger: m1rc3/norruption/2/collda: oops, only look for collateral damage on standby.fpg (master) http://qi-hw.com/p/wernermisc/cb024e109:09
qi-bot[commit] Werner Almesberger: m1rc3/norruption/2/dumplock: dump NOR locks (untested) (master) http://qi-hw.com/p/wernermisc/e0f8fc009:09
qi-bot[commit] Werner Almesberger: m1rc3/norruption/2/dumplock: use correct offset; fixed block number counting (master) http://qi-hw.com/p/wernermisc/a6136bd09:24
whitequarkdarn. that buck converter just does not work12:25
whitequarkI've checked the schematic (~identical to the one in DS, and verified by common sense as well), pinout (fine), soldering (fine), shorts (fine)12:26
whitequarkand I only maybe heated it for 30 sec at 330 deg. C with hot air12:26
whitequarkit's tps6206012:27
whitequarkits output is just zero, and that's it.12:27
whitequarkany advices?12:32
kristianpaulcurrent load is fine too?12:40
qi-bot[commit] Xiangfu Liu: new package: Taskwarrior is a command-line todo list manager (master) http://qi-hw.com/p/openwrt-packages/461384d12:45
wolfspraulrejon_: ^ look at that ;-)12:45
viricthat's a competitor to one of 'my programs' ;)12:49
whitequarkfuck those chinese vendors, and especially blind/attention deficit me12:51
whitequarka piece of misplaced silkscreen has got between feedback pad and pin.12:51
whitequarkat least, it _did_ on another board12:51
whitequarkon _every_ another board12:52
whitequarkchances that it did it on this one as well.12:52
whitequarkkristianpaul: I've tried with open circuit (just output cap) and 1.8k resistor12:53
qi-bot[commit] Xiangfu Liu: taskwarrior: update DEPENDS and description (master) http://qi-hw.com/p/openwrt-packages/1aed30c12:53
kristianpaulwhitequark: btw what are you building?12:54
whitequarkkristianpaul: a thingy for connecting an AT91SAM9G45 ARM board to a (one particluar) notebook LCD (which one my friend wants. as long as he understands that it will probably fail miserably _and_ cost him $100 in materials, it's fine imo)12:56
whitequarkit accepts a TFT input and spits out LVDS12:56
whitequarkalso, there is a 5V->3.3V buck converter for backlight12:56
xiangfurejon_, http://en.qi-hardware.com/wiki/Applications#Taskwarrior  :-)12:56
whitequarkoshw, of course. under wtfpl :)12:56
kristianpaulwwo that was fast xiangfu ;)12:57
Action: whitequark unsolders that f..., oh I mean buck converter for 5th time12:57
kristianpaulwhitequark: you should be more relaxed when unsoldering stuff :)12:58
whitequarksurprisingly, I am probably improving my skill. at least it took 15 seconds and not five minutes now, hmm12:59
whitequark(either this, or it wasn't soldered at all)12:59
whitequarkahh. and _of course_ this board has perfectly fine silkscreen, just according to Murphy's law13:00
whitequarkor maybe not13:02
whitequarkdoes anyone know what can be used to wash off silkscreen?13:02
whitequarka sharp screwdriver does not help much13:03
whitequarkacetone: no effect13:05
qi-bot[commit] Xiangfu Liu: taskwarrior: rename package name to taskwarrior (master) http://qi-hw.com/p/openwrt-packages/3fd7a4a13:06
kristianpauli found this http://en.qi-hardware.com/wiki/File:Normal_tools.png, who can translate what said above PC?13:07
kristianpauli guess is the cleaner13:07
xiangfukristianpaul, yes. PCB board cleaner13:08
kristianpaulhum, i was hoping more details :)13:09
xiangfuPC  --> PCB  :-)13:09
xiangfuneeds ask Adam when and how to use it.13:09
kristianpauland what he thinks is made of13:10
qi-bot[commit] Xiangfu Liu: gtypist: fix typo in DEPENDS (master) http://qi-hw.com/p/openwrt-packages/ecb69c713:21
wpwrakregarding the applications, "This page lists all the programs available in the latest OpenWRT distribution image." is this true ? or are also installable applications on the list ?13:33
whitequarkkristianpaul: ok, now it _is_ soldered correctly. still the same result.13:34
wpwrak(remove solder stop or silk screen) a knife should do for scratching. but be warned - the knife will also scratch away copper if used too much.13:37
wpwrakwhitequark: you have a good chance that your contacts aren't soldered. this sort of package is difficult.13:37
wpwrakwhitequark: also, can you see metal on the side ? or is it just the the bottom ? in the latter case, you would have to heat the solver via the copper, which would be very difficult with your large ground plane.13:39
wpwrak(well, or use hot air. but careful with that, too.)13:40
whitequarkwpwrak: I've did it with hot air. I can see the metal at the sides; actually, that's how I determined that it is actually soldered13:41
whitequarkI've attached a needle to a multimeter and checked the connections13:41
whitequarkfor shorts too13:41
whitequarkactually, I've checked that thrice.13:41
wpwrakvery good. then it could only be a bad chip or a design bug13:42
wpwrakdid you check the chip's orientation ?13:42
whitequarkit's correct too, of course13:43
whitequarkI've picked the datasheet, rotated the board to match the print and manually checked all the traces from the chip13:43
whitequarkit is, uh, very simple. a couple of caps on input and output, a coil, a resistor feedback divider and a pull-down on EN pin13:44
whitequarkthat's it13:44
whitequarknot a lot of places to screw up there13:44
wpwrakEN should be pulled up13:45
whitequarkactually, no-- the converter should be normally of13:45
whitequarkalso, I've checked it with both levels, just in case13:46
wpwrakah, okay. but you're pulling it up for testing then.13:46
wpwrakdo you see anything on SW ? (with a scope)13:46
whitequarkhm, let me check13:46
whitequark(by the way, is DSO quad worth it? I currently have an analog Soviet scope, and it's kinda big and heavy. And it has a BW of 10MHz and the memory of how-much-can-you-fit-on-that-screen)13:48
wpwrakyou want a DSO ;-)13:48
wpwraki haven't seen any inexpensive quad-channel scopes with good memory, though13:48
whitequarkthe soviet one has only one channel13:49
whitequarkI'm worried a bit about the resolution of DSO (8 bit), through13:49
whitequarkdoes that matter?13:49
wpwrakrigol makes decent low-cost (in the USD 500-1500 range) scopes with deep memory. only 2 channels, though.13:50
blogici am just thonking about getting one of the rigol13:50
blogicRIGOL DS1052E13:50
blogicthis one specifically13:50
whitequarkahh, heard a lot about it13:50
blogiclooks like there are hw ans sw hacks to make a 100mhz13:51
wpwrak8 bit usually is plenty. you can sweeze out more with averaging if you have periodic signals13:51
whitequarkdso quad isn't really "quad"13:51
whitequarkit only has two analog channels13:51
blogicwpwrak: have you used the rigol scopes ?13:51
wpwrak"false quad" that sounds unusual13:51
whitequarkwpwrak: http://www.seeedstudio.com/wiki/DSO_Quad13:51
wpwrakblogic: i have a DS1102CD13:51
whitequarkdso quad is only $200. that's somewhat affordable for me, especially given its physical size. not sure if other characteristics are equally good, through13:52
whitequarkis 4Ks of storage per channel enough?13:53
wpwrakfor what's basically a "pc scope", they skimped quite badly on memory13:53
whitequarkI guess external memory was too expensive/hard to add13:55
whitequark(iirc cortex-m3's do not generally have memory controllers, and stm32 ones definitely do not)13:55
kristianpaula good place in wich i can find math snipets implemented in C? any ideas?13:56
wpwrak72 MSa/s is very low. the effective analog bandwidth is thus about 20 MHz with one channel, 10 MHz with two13:56
whitequarkwpwrak: still better than my soviet scope. I doubt I can find more for $20013:57
wpwraki would still get the rigol :)13:57
kristianpaulor a clone https://www.sparkfun.com/products/10806 ?13:58
wpwrakthe DS1052E sounds quite decent to me. deep memory, sufficient sample rate, all the necessary controls.13:58
whitequarkkristianpaul: a clone costs better. what do you think about quality?13:59
kristianpauldunno... i would prefer a second hand rigol anyway :)14:00
zrafaare you using finally sdl-widgets?.. I would like to know how 14:00
kristianpaulalso this lack ethernet wich is not aceptable those days i think :)14:00
kristianpaulzrafa: me?14:00
wpwrakkristianpaul: (clone) the comments say it's a tek clone. in this case, check the amount of memory it has :)14:00
whitequarkkristianpaul: for what purpose is there ethernet on a scope?14:00
zrafakristianpaul: no idea.. I replied the sdl-widgets mail explaining why it does not work in BEn, and I see that you have ported it 14:01
wpwrakbesides that, teks are nice. handle better than rigols. but at equivalent specs, they're also considerably more expensive14:01
kristianpaulzrafa: i would like to use it, but need some time to learn the basis like making a fronted for sox like you did in jlime, remenber?14:02
zrafakristianpaul: so I was thinking that you are starting to use sdl-widgets, and I would like to know how. it just works with mouse (the widgets)14:02
whitequarkwpwrak: (SW pin) nothing14:02
kristianpauljust mouse :/14:02
zrafakristianpaul: but.. did you understand my mail?14:02
zrafakristianpaul: maybe I did not explain it well14:02
kristianpauli dont14:02
wpwrakkristianpaul: usb is also okay. sometimes even preferable. depends a bit on what you do. in the lab, ether or usb are pretty much the same. main difference is that you're more likely to find a web server on ether-connected devices.14:02
kristianpauli took it as if you recomend it but warned about screen size problems?14:02
kristianpaulwhitequark: remote managed or even scripting , well some scopes support that..14:03
zrafakristianpaul: no.. the screen size problem was my answer for some music composer program which uses mod and s3m14:03
wpwrakwhitequark: not good ... resistance of SW to ground ? (when the circuit is unpowered)14:03
zrafakristianpaul: I did another answer for sdl-widgets werner found14:03
kristianpaul"The idea of those widgets are just to be used with mouse, no keyboard."14:04
kristianpaulouch :)14:04
wpwrakkristianpaul: time to roll up your sleeves ;-)14:05
zrafakristianpaul: I think that I was the only fan of music in demos and intros here :) (which used mod and s3m, which I played for a while with those programs to compose music with samples)14:05
whitequarkwpwrak: 2.78K14:06
wpwrakwhat is MODE set to ?14:06
whitequarkwhat does that mean?14:06
zrafakristianpaul: at that time I ported several "tangos" songs to mod using those programs.. 14:06
whitequarkwpwrak: (mode) high, i.e. fixed-freq14:07
whitequarkit's connected to input power rail, directly14:07
wpwrakit means "not open", "no shorted". that's all i can read from it ;-)14:07
zrafakristianpaul: reading the music scores and then porting 14:07
kristianpaulwpwrak: time to look for another inresting widget project ;)14:08
whitequarkwpwrak: (sw) ah. same here. I'm sure it should not be shorted, but why not open?14:08
kristianpaulzrafa: btw tht youtube vide you passed, can actually sound same in the nanonote?14:08
wpwrakbecause you have R1 and R2 14:08
zrafakristianpaul: the mods using tiny sound samples.. and they are combined, so yes, they should sound okey14:09
wpwrakdid you load the output ?14:09
zrafakristianpaul: they were used by intros and demos14:09
whitequarkwpwrak: I've put an 1.8k resistor there14:09
kristianpaulah combining is the trick i see14:09
kristianpaulwell, sounds pretty nice !14:09
zrafakristianpaul: they worked in older PC with dos14:10
wpwrakwhitequark: sounds good, too. time to re-check the pins, i guess. with special attention to ground and Vin14:10
whitequarkwpwrak: okay14:11
wpwrakoh, and did you measure SW-to-GND when the output was loaded with 1.8 kOhm ?14:11
whitequarkwpwrak: nope, the load was disconnected14:12
whitequarkso that was just R1+R214:12
whitequarkokay, I've rechecked pins, ensuring that I am touching the chip pads itself and not PCB ones14:13
whitequarkthey're fine14:13
wpwrakwhen you connect power, does Vin look good ? and what current consumption do you get ?14:14
whitequarkyeah, Vin is 5.06V (USB)14:15
whitequarkcurrent, hm14:15
whitequarkI have had a special cable somewhere...14:15
whitequarkand where do they go?..14:17
wpwrakthe rest of the circuit ? or are you measuring just the converter ?14:18
wpwrakA or B ? :)14:18
whitequarkthat 5V input is connected just to the converter14:18
whitequarknothing more14:18
whitequarkand I'm mucking with it separately14:18
wpwrakhmm. then you do indeed have a good question :)14:19
wpwrakare you sure your pins are really where you think you are ? e.g., is "top view" really "top view" ?14:19
wpwraks/think you are/think they are/14:19
whitequarkif they're correct in DS14:20
whitequarkthe chip looks like this14:20
whitequark. C6Y14:20
whitequarkthe . is on the ground, next pin is SW, next is GND, and so on14:21
whitequarkthe printing on the chip is vertical when the big connector on the board is on the bottom14:21
whitequarkand the dot is on the right14:21
whitequarkit fucking works.14:22
whitequarkhow the hell?!14:22
whitequarkno, really.14:22
wpwrakperhaps you convinced it that there were no excuses left for not working ;-)14:22
wpwrakyou could try gently pushing against components and see if it stops working14:23
wpwrakdefective solder joint, cracked traces, or broken bonding wires can all cause this sort of trouble14:24
whitequarkwell, the voltage changes when I touch feedback resistors, but that's normal14:25
whitequarkahhh, I have two ideas14:25
wpwrakbonding wires are particularly nasty. there, the defect is INSIDE the chip14:25
wpwrak(feedback change) yeah, they're very high-Z, so your finger makes a big difference14:26
wpwrakalso flux residues and such could heavily upset this circuit14:26
whitequarkfirst. when I've changed my multimeter from voltage measurement to current measurement mode, I've replugged the probe, but it has correctly measured input voltage and checked the continuity ("beeping diode mode", not sure how is it called correctly)14:27
wpwrake.g., in atusb, i had flux mess with my reset timing. it contributed something like 100 kOhm.14:27
whitequarksecond. I've used a flux cleaning thingy--yes, that flux-off14:27
whitequarkit is dimethoxymethane14:27
whitequarkeither this, or I have not dried it completely after bathing14:28
wpwrakbathing = ultrasound bath ?14:28
wpwrakwhat liquid did you use ? tap water ?14:28
whitequarkit's filtered (not sure if you have same things in your country, but we do: it's an activated-carbon-filled (at least it looks like this way when disassembled) filter, you put tap water in, you get something better (and without any chlorine) out)14:29
whitequarkand I've boiled it in a kettle14:29
whitequarkpoor man's distillation14:30
wpwrakphew. so much work ;-)14:31
whitequarkbut now I'm a bit wiser14:31
wpwrakyou could get demineralized water from car supplies14:31
whitequarkyeah, I know. but I constantly forget about that. also, I'd need a whole lot of it14:31
whitequark*forget when I'm near the shop14:31
wpwrak(for cooling. without additives. hmm, if they have that in russia :)14:31
whitequarkdon't know about car supplies, but I've seen that kind of water in electronics shop14:32
wpwraki have a DIY shop a few blocks away that has this sort of water in 5 l canisters. let's see how much it costs ...14:32
whitequarkdoes it have, well, a website?!14:33
wpwrakabout USD 1.3 per liter14:34
wpwrakthen click on "Capital Federal y Bs. As." on the right14:34
whitequarkI want to live in your country, whatever it is. DIY shops with websites, wow.14:35
wpwrak(in the "Clientes NO registrados" box)14:35
wpwrakzrafa: do you hear ? the recruiting of new immigrants is progressing well :)14:35
whitequark$10 for 5l. that's nice14:35
wpwrak$ = pesos. oh, sorry ... it's less than USD 1.3 per liter. only about ... USD 0.5014:36
whitequarkso, $5. even better14:37
wpwrakgrmbl. x server hang :-(14:40
qi-bot[commit] Werner Almesberger: m1rc3/norruption/2/dumpotp: quick and dirty script to dump the OTP memory (master) http://qi-hw.com/p/wernermisc/97af8ea14:47
wpwrakwhitequark: yeah, about 51 US-cents per liter of distilled water. affordable :)14:54
whitequarkhah. I'm doing the final cleaning, as I've not bothered to clean it each time I've moved the chip 0.1mm to some random direction14:56
whitequarkwonder if will work afterwards14:56
whitequarkhmmmm. is that water in ultrasonic bath boiling?14:57
whitequarkor is that just the fog?14:57
whitequarkI couldn't tell easily. It's hot.14:58
wpwrakit's supposed to be room temperature15:00
whitequarknot for this particular cleaner, I guess15:00
wpwrakthat is, unless your have an ultrasound cleaner with heating. i guess there's no harm in exposing your circuit to 100 C, though15:00
whitequarkit has, ahem15:00
whitequarkit does not supposed to have a heater.15:01
whitequark*is not15:01
whitequarkbut it has a very chinese power supply15:01
whitequark(yes, that's an adjective)15:02
wpwrakone of those days, one of your "special" devices will kill you ...15:02
whitequarkthat's not very unlikely, yes15:03
whitequark(regarding that. I have -- yes, have -- a friend who once had a Soviet scope with a failed power plug. yes, the 220V one. when it did not worked, he pushed the exposed metal bars into the socket with his bare hands)15:04
whitequarksomehow (surprisingly) he is still alive15:04
whitequarkand does all sorts of weird stuff from refrigerators to solid-body lasers15:05
DocScrutinizerwpwrak: distilled water for cooling?? WTF? highly deprecated, will etch away your car's cooler15:08
wpwrakwell, some people worry about how they'll live when they're too old to work. at least he seems to be free of such concerns :)15:08
wpwrakDocScrutinizer: maybe it's for something else. but in any case, they sell it in the cars stuff section15:08
whitequarkDocScrutinizer: etches? really? it's distilled water. isn't it supposed to not contain anything except H2O?15:08
DocScrutinizeryep, for lead-acid bateries15:09
wpwrakcould be. next to it, they have water "with additives". no idea what these do, though.15:09
DocScrutinizerit's diluting any chalk that's already coating the cooler insdie, and it also dilutes the metal partially15:09
DocScrutinizerI've been puzzled as well that it's *that* bad, but I heard it several times: do NOT use distilled water for cooler refill15:11
wpwrakwhitequark: you mean this stuff ? http://www.dhmo.org/facts.html15:11
whitequarkwpwrak: :)) yeah, it's a well-known joke15:13
DocScrutinizerwhitequark: cleaning with distilled or even clean tap water is OK, but you should finally rinse the board with 99% alcohol which is hygroscopic and will remove water from locations you can't reach with pressurized air etc15:20
whitequarkDocScrutinizer: thanks, I'll do15:22
DocScrutinizerthough virtually all of the residual substances fund after manufacturing/repair/rework are not water soluble, so water is useful only to clean board that suffered from spilled coke, coffee etc15:22
DocScrutinizeras e.g sugar is hardly soluble in alcohol and non-polar solvents15:23
whitequarkyeah, but I'm not sure if ultrasonic bathing of the board with 99% alcohol is a good idea15:24
DocScrutinizerwell, I'm not sure if ultrasonic bath is a good idea at all15:25
whitequarkflux-off (dimethoxymethane) does something with the flux so it almost completely goes away, and bathing gets rid of what remains after flux-off15:25
whitequarkas you can see from the image, this produces quite good results15:26
whitequarkoh, the image: http://imgur.com/kClLl15:26
DocScrutinizerit's removing things by cavitation erosion (building up microscopic "vacuum" bubbles on the surface, that - when collapsing - really do hard impact on the surface)15:26
whitequarkyeah, I know15:26
DocScrutinizermight even remove thin copper coatings etc15:27
zrafawpwrak: recruiting : ;-)) .. and you just promoted some DIY shops.. :)15:29
DocScrutinizerI just applied to a really blaergh job, so who's recruiting and do they pay good?15:31
wpwrakwater also removes water-soluble flux. and yes, you can use pure alcohol i an ultrasound bath.15:37
wpwrakthe main issue with ultrasound is resonance. the better devices (for cleaning electronics) therefore vary their frequency.15:38
whitequarkwpwrak: I definitely can, but it is _not_ easy to get large quantities of pure alcohol here, guess why.15:44
whitequarkI have a 5l canister, and it is, well, valuable :D15:45
DocScrutinizeruse one of the other alcohols then, methanol, isopropanol15:47
DocScrutinizerdoesn't really mater as long as it's pure (not that 70% stuff)15:48
whitequarkI'm afraid of methanol (as of any other quite poisonous easily evaporated substance), through isopropanol may be a way to go15:48
qwebirc56550Does anyone know about Nanonote Manufacturing, who should i contact ?15:49
wpwrakwhitequark: yeah, i was thinking of isopropanol. not your 5 l canister of premium vodka ;-)15:51
DocScrutinizermethanol is relatively harmless, it's the formaldehyde that your liver produces from methanol that's the problem (that's why you get huge amounts of ethanol in hospital when they diagnose and tread a methanol intoxication. Same liver enzymes that methabolize ethanol to acetaldehyde also are producing formaldehyde from methanol, so diluting methanol with ethanol helps to reduce the formaldehyde level in blood)15:52
wpwrakqwebirc56550: i guess that depends a bit on what exactly you're after. but probably wolfgang15:52
qwebirc56550Yes a saw his name, but i''m new here, how can I contact him ?15:53
wpwrakDocScrutinizer: so to get your doctors to give you a prescription for lots of booze, you need to tell them you had consumed some methanol ? interesting15:54
whitequarkDocScrutinizer: yeah, I know that. this does not changes the fact that it is dangerous to work with15:54
DocScrutinizerthat'S what worked several times already, yes15:54
wpwrakqwebirc56550: either lurk here or send mail: Wolfgang Spraul <wolfgang@sharism.cc>15:54
whitequarkwpwrak: that's not vodka, just some pure alcohol :D it has happened to get to me untouched somehow. I don't quite recall how I got it15:54
wpwraknow we know DocScrutinizer's secret :)15:54
qwebirc56550thanks a lot !15:55
wpwrakwhitequark: temporary memory loss is often associated with in vivo quality control of ethanol :)15:57
whitequarkwpwrak: :) somehow the things has arranged in an interesting way: I haven't ever drinked anything alcohol-containing16:08
whitequarki.e. in my entire life16:08
wpwrakor at least you don't remember such events ? :)16:09
whitequarknor does anyone else16:11
wpwrak(lack of memory) at least that's how you should express it to avoid tarnishing russia's hard-earned reputation16:12
wpwrak(anyone else) hmm, social drinking would explain this :)16:12
whitequarkI don't really think it is a good reputation, especially given that it is very close to truth16:14
whitequarkhah. http://cds.linear.com/docs/Application%20Note/an25fa.pdf : look at the last page16:16
whitequarkalso, read every other one.16:18
whitequarkhave you ever seen drunk capacitors? http://easyelectronics.ru/img/Instrument/ProskitSS217/sx_proskit.jpg17:18
wpwrakalso the voltage regulators look a little tipsy17:25
DocScrutinizerAT98C2051 \o/ my private pet17:41
DocScrutinizerawesome lil critter17:42
whitequarkhuh? have you developed it? :)17:42
DocScrutinizer89 of course, not 9817:42
whitequarknot that I'd be surprised if you did17:45
DocScrutinizernot exactly, just had an own design with it (pusteflipper, easy to google) - the PCB for that one looked nicer than the one linked above though: http://maemo.cloud-7.de/dscf33*17:52
whitequarkDocScrutinizer: that URL does not work18:21
whitequarkgoogled it (the device). what the hell it does?!18:23
DocScrutinizerhttp://maemo.cloud-7.de/dscf3349.jpg http://maemo.cloud-7.de/dscf3350.jpg 18:29
DocScrutinizerthe controller operates some 5 LED/phototransistor light barriers, and flash some LEDs and move some magnets18:32
whitequarkit's quite ancient18:35
DocScrutinizerback when I had a real "company name" jrwsoft18:36
DocScrutinizerrunning a real company is a PITA though, so I stopped that ;-D18:36
DocScrutinizerbtw the whole device is a medical aid for kids with problems to speak correctly - you blow a small plaic ball with a straw (or without) and manage it into some target holes18:39
DocScrutinizerkinda micro table air minigolf18:40
DocScrutinizerthe controller gives a kind of scoring and feedback18:41
DocScrutinizerbtw "flipper" is the german name for pinball18:42
whitequarkand "puste" is...?18:42
DocScrutinizerso it's blow-pinball18:42
DocScrutinizerwhich pretty exactly describes the whole thing18:43
DocScrutinizerhttp://mausklick-produktion.de/ upper left and right shows it better than I could describe here18:44
whitequarkyeah, I see18:58
whitequarkwpwrak: thanks21:32
whitequarkI ditched the solder paste completely and just pre-tinned each pad21:32
whitequarkalso, LOADS OF FLUX21:32
whitequarkI was able to make a second such board in less than a hour21:32
whitequarkhave I mentioned flux? :D21:32
zrafais sebastian here?.. He will like this video : http://www.youtube.com/watch?v=qwIAjB99ucw22:25
zrafait is like X but 30 years older22:25
wpwrakwhitequark: congrats ! ;-)23:12
wolfspraulgood morning everybody23:17
wpwrakzrafa: revolutionary !23:18
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