2009-09-27.log

--- Day changed Sun Sep 27 2009
genehackerhmmmm....00:00
genehackerhey I think that andy howell guy was at dorkbot00:03
ybitare you guys going for a toolbook-like animation with pycal3d?00:07
kanzureybit: toolbook incorporated that idea from skdb00:08
drazakman sometimes you guys are more boring than reading the most bland technical manual00:08
fennwhat about an auto-generated technical manual00:09
kanzureyou do realize we're basically making a bland technical manual generator?00:09
kanzurehey >:(00:09
kanzurestop reading my brains00:09
fennsorry it's so difficult with all the cross talk in here00:09
kanzuredidn't yo mamma tell you to not cross the signals?00:09
fenncan't stop the signal mel00:10
genehackercomplete with indecipherable japanese and oh wait...00:10
drazakman sometimes you guys are more boring than reading the most bland technical manual00:10
drazakshit00:10
drazakI just said that00:10
drazaknevermind00:10
drazakI was scrolled up like 2 lines00:11
drazakand thought it didn't post :S00:11
kanzurefail00:11
genehackerisn't there some version of autocad that does that?00:11
genehackeri think that's patented code00:11
kanzurehttp://media.photobucket.com/image/signals%20cross%204chan/Ragnor144/Fail%20Macros/GiraffeeFail.jpg00:11
fennoh noes patented code00:11
fennthe sovereign nation of AutoCAD00:11
fennthey are going to bust down my door with military robots00:12
genehackerno00:12
genehackerthey're just going to sue you or something00:12
genehackerwoohoo fun winblows error time00:13
genehackernow what does one use to bore out large diameter holes in aluminum rod stock?00:15
fennwhy not just buy the stock as tubing instead00:16
genehackercan you buy cheap 1.5 foot lengths of 2 inch OD aluminum tubing for not expensive?00:17
genehackerI need to check the machine shop...00:19
genehackerI want to make a high power piston based water gun from hell00:19
fennjust use a pneumatic cylinder00:21
genehackernow where do I get those?00:21
genehackerhere's the deal00:22
genehackerI want a dual diameter piston00:24
fenna telescoping piston?00:24
fennoh you could use a bike pump00:24
genehackerhmmm.. on second thought I don't have an aircompressor00:25
genehackerthis might be impractical00:25
fenneh?00:25
fennmind sharing with the rest of the class?00:26
genehackerhttp://www.sscentral.org/homemade/supercannon2.html00:27
genehackerI was thinking something like this00:28
genehackerbut with a piston that has a large diameter that goes to a small diameter 00:29
fenna tapered bore?00:29
genehackersmall diameter piston goes to a small diameter pipe filled with water connected to the nozzle00:31
genehackerother end connects to pressurized air pipe00:31
fennoh, an intensifier00:31
genehackeryeah00:31
fenndon't kill yourself00:32
genehackerwell considering I'm not a very good machinist, I don't have much in the way of tools or transportation00:33
genehackerit's probably not going to happen00:33
fennyou can get air-powered hydraulic pumps from harbor freight00:33
fennalso they sell a little air powered grease gun for $2000:33
genehackerhmmm...00:34
fennbut realistically 100psi is way too high for a squirt gun anyway00:34
genehackerI want to spend less than $2500:34
fennhah00:34
fennbuy a squirt gun00:34
genehackeri did00:34
genehackerthis is for an assassin contest00:34
fenni don't know what that means00:34
genehackerit means that people with waterguns are going to be a common sight in ETC 00:35
* ybit eats CIA-32 00:47
* CIA-32 tastes crunchy00:47
ybitsee, drazak, we're not boring00:47
* ybit rubs CIA-32's tummy00:48
CIA-32*purr*00:48
genehackerhey don't abuse our bots00:49
drazaklol00:49
ybitgenehacker: i think cia-32 doesn't like to be referred to as 'bot', it's slightly derogatory00:50
genehackerthey might have something that resembles the feelings of a flatworm!00:50
* ybit thinks the pythonocc svn is going to build, not the one in kanzure's dir00:50
genehackerI wonder if sufficiently fast programs would have something like senses00:52
ybitgn i suppose :-\00:52
* ybit kills CIA-32 00:52
* CIA-32 dies00:52
genehackerwould they feel pain?00:53
ybityeah00:53
* ybit kicks CIA-32 00:53
CIA-32ow00:53
ybitsee00:53
genehackerthough what is pain00:53
* ybit suggests changing the topic to philosophy allowed between the hours of 2-5am00:54
genehackerphilosophy detected terminating00:54
ybitso come back in an hour, and you might be in the clear00:55
* ybit waves gn00:55
genehackerI should just keep mapping out the reactions00:55
* ybit hugs CIA-32 00:56
* CIA-32 hugs ybit00:56
genehackersleep is for weak people00:56
ybiti'll remember that and call you when you drift off later this afternoon00:57
ybit..just to remind you00:57
ybitthird time's a charm: and i'm out00:57
genehackerok00:59
drazakblah01:15
drazakbeen staring at circuit diagrams all day01:15
drazakand excel01:15
drazaktrying to part out this freaking amp01:15
genehackerugh01:22
genehackerwhat does 3 h stand for with reference to chemical abbreviations01:23
genehackeras far as I know combining two chemicals that don't contain phosphorus to make something with phosphorous is impossible01:25
genehackerphosphine01:29
genehackerit's gotta be phosphine01:29
drazakwhat context01:31
genehackerin synthesizing beta-cyanoethyl N,Nbis(diisopropylamino)chlorophosphine01:32
genehackerfrom01:33
drazakwhere does 3h come from?01:33
genehackeri-Pr2EtN, 3 h, CH2-Cl2, 0 °C --> RT, 70-77%01:33
genehackerit's gotta be phosphine01:33
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bkeroAnybody try doing some OCR recently?04:54
bkerokanzure: ?04:54
fennwhy d0 you ask?05:19
kanzureno not recently07:16
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ybitwas nalioth informing about cloaks for this channel? 11:53
ybito i c, group registration12:00
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* ybit is looking for modular house designs15:24
ybitwill gradually expand the building as my limited income allows15:25
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kanzurehouses are for quitters15:27
ybityeah, modular warehouse, how 'bout that? 15:30
Utopiahyep, cf http://www.peopleofwalmart.com/?p=391415:31
kanzureshipping containers15:31
ybithah, i like the second comment fromt that link15:33
kanzurei made a wrapper for cal3d15:33
kanzurehttp://adl.serveftp.org/~bryan/pycal3d/15:33
ybitnice, and you included install notes15:36
ybithttp://www.containercity.com/riverside-building.html nice15:38
ybitseeing some really neat designs using shipping containers, if the price is reasonable, i'm sold15:39
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ybit~$100 each, but it seems you have to buy in bulk15:40
ybite.g. http://cgi.ebay.com/20%60-shipping-cargo-storage-container-So.-California_W0QQitemZ140224168109QQcmdZViewItem15:41
genehackerybit are you plannin on making snowcrash style apartment15:43
genehackers15:43
ybitmore like a warehouse, no apartments15:46
genehackerhave you read snowcrash?15:51
ybitthough, if the hackerspace idea comes into fruitition, i don't have a problem with friends living there, it certainly wouldn't be much of a technical problem adding on another container15:51
ybitno15:51
genehackerread snowcrash15:52
genehackerit's good15:52
ybitgenehacker: hows about you describe these apartments to me :)15:53
genehackerhttp://www.technovelgy.com/ct/content.asp?Bnum=12115:56
AchiestDragonybit  the shiping containers are sell at about £800 gbp  on ebay , although the conversions  cost  upwards of £3000 depending what you want inside it 15:58
ybitgenehacker: thanks for the link15:58
drazakybit: call around to railroads and shippers and stuff and see if htey have extra ones that they want to get rid of16:09
nykodemusI both second and third the suggestion to read snowcrash16:26
ybitnykodemus: that is not allowed my friend, second or third, but not both :P16:44
kanzurehttp://adl.serveftp.org/~bryan/screenshots/2009-09-27-porrasturvat.png17:01
genehackerkanzure why are you playing stair dismount?17:08
kanzurei feel compelled to try to decompile anything that people don't offer sources to17:08
genehackerare you going to use a search algorithm to find the highest possible score?17:09
kanzureno the source isn't available17:10
genehackerI have something that doesn't have the source17:10
genehackerthat is the only reason I don't use linux17:10
genehackermy textbook reader17:11
kanzuredoes it run under wine?17:12
genehackerno17:13
genehackerit needs .NET framework 3.517:13
genehackerand of course that won't work17:13
kanzureoh then mono should be able to run it17:14
genehackerwhat's mono?17:15
kanzuresudo apt-get install mono17:15
kanzureit runs .NET on linux17:15
genehackerreally?17:15
genehackerok17:15
genehackerI'll try that when I boot up linux17:16
genehackerif you feel compelled to decompile everything17:17
genehackerI've got a whole bunch of fun stuff for you to decompile17:17
ybitthe cost is roughly 1.5kusd-2k like AchiestDragon mentioned 17:41
ybitbut as a npo, i'm guessing these companies would sell at a reduced cost and take the tax write-off17:44
kanzurei need a marketing drone17:46
kanzureanybody in here into marketing?17:46
* ybit quits blogging about building construction materials, though there are several ones which can be implemented cheaply: tire home, mud home, wood (from the mini forest that will be chopped down)17:50
ybitkanzure: what are you looking to market?17:50
kanzureme17:52
genehackerthat can be interpretted in many ways17:53
genehackerstep 1 of marketing, who do you want to sell to?17:54
genehackerwhat your selling doesn't matter17:54
genehackerwith good marketing it can be sold17:54
genehackerthat's all you need to know17:55
fennybit get one of these http://www.farmtek.com/farm/supplies/cat1;ft1_tension_fabric_buildings;ft1_clearspan_tension_fabric_structures.html19:05
ybitthat's neat19:06
ybitguess the articles of incorporation need to filed soon before i start hitting up companies19:06
ybitfenn: my question is how does it withstand highspeed winds during tornado season.19:16
ybithow +well19:16
fennum. how well does anything withstand tornadoes?19:17
fennseems to me that the rounded ones would probably be the most robust structure in a wind storm19:18
fennyou can also get a "wide" building which is shorter19:21
fennhttp://www.clearspan.com/fabric/structures/ext;Structures/Sizes.html19:24
fennhttp://en.wikipedia.org/wiki/Salt_Lake_Tabernacle#Construction19:30
fennyou can get custom printed graphics19:39
genehackerin color?19:40
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fennyou can get any color you want as long as it's blue19:46
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kanzurenice email from anders20:40
kanzuregood to see he's not totally dead20:40
drazakdoes anyone know of any unity gain stable opamps that have low voltage requirements and are suitable for an audio amp in the ground position?20:42
genehackerno, but I know of some fluidic sound amplification devices with good frequency response qualities20:43
drazakI already have a design, I just need to pick an opamp20:43
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kanzurehello mason-l 20:55
mason-lHello kanzure 20:55
kanzurehuh docstrings are an optional parameter for swigging stuff. /me fixes20:57
kanzure%feature("autodoc", "1")20:57
genehackerhttp://hardware.slashdot.org/story/09/09/27/2020204/Revisiting-DIY-HERF-Guns?art_pos=420:57
genehackerI wonder if HERF guns will become more widespread if EEstor sells their capacitors to the public20:58
katsmeow-afkTL081 or TL07120:59
katsmeow-afkbut you didn't define "low voltage" , so i dunno21:00
kanzurein what package is gl/gl.h given? apt-file search isn't showing me anything21:58
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kanzurehello idiot22:02
Guest91727hello kanzure22:11
drazakkatsmeow-afk: TL071 sucks for audio22:19
drazakkatsmeow-afk: sure, the slew rate is fast enough, and it's like what, 30khz? it just doesn't sound good22:19
katsmeow-afkwhere do you get the 30khz figure?22:23
katsmeow-afkyou want rail-to-rail +/- 15v ?22:23
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katsmeow-afkbesides, you know you can put a simple gain stage after it?22:24
fennperhaps i'm an anti snob, but isn't just about any transistor more than fast enough for audio?22:27
katsmeow-afkyeas, but few are linear all over their curve,, and a curve is by definition not linear22:28
katsmeow-afkhowever, a decent opamp and any ole transistor is easily good enough for PA use22:28
drazakkatsmeow-afk: way lower than 15v, try 7.6v rail to rail, my audio opamp is a dual channel AD823, but they don't make a single channel version for my ground channel22:41
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katsmeow-afkyeas, low voltage operation can be a pita, due to limited output swings and lockups22:42
drazakyeah22:42
drazakit's for a NiMH 9volt battery powered headphone amp22:43
katsmeow-afkcan you level shift your signal up and make a fake gnd at 3.8v?22:43
drazakhere, look at the schematic22:44
drazakhttp://tangentsoft.net/audio/pimeta2/misc/sch-2.01.pdf22:44
katsmeow-afk?22:44
katsmeow-afkumm, they call out al lthe parts numbers there for you22:45
katsmeow-afkwhy ask us?22:45
drazakbecause I'm not using all the same parts22:46
drazak:P22:46
katsmeow-afkIC2 already make a vcc/2 gnd for you22:46
drazakright, the tle242622:47
katsmeow-afki guess i don't understand the problem22:47
katsmeow-afk[22:42] <drazak> katsmeow-afk: way lower than 15v, try 7.6v rail to rail, my audio opamp is a dual channel AD823, but they don't make a single channel version for my ground channel22:47
drazakright22:48
drazakthe ground channel takes a single channel opamp22:48
katsmeow-afkwhat are you calling a "ground channel" ?22:48
katsmeow-afkall those are using 2 opamps22:48
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katsmeow-afkoh, the IC2 itslef??22:49
drazakno, OPAG22:49
katsmeow-afkhttp://www.google.com/search?q=%22low+voltage%22+%22single+supply%22+opamp22:51
katsmeow-afki understand the point of an opamp there, but i suspect you can get by with C3 C4 C5 alone22:53
drazak3-channel topology keeps headphone return currents from disturbing the signal ground22:54
katsmeow-afkyeas22:54
katsmeow-afkok, use a dual or quad package in place of OPALRG$1, OPALRG$2 , OPAG , and the TLE242622:55
katsmeow-afkinstead of what looks like 4 separate 8pin dips?22:56
drazakit's 2 8 pin drops22:56
katsmeow-afkIC2 is shown as 1/2 the chip, can't you use the other half for the OPAG circuit?22:56
drazakthe tle2426 comes in a to92 package22:56
drazakand it's shown as 1/222:57
katsmeow-afkthe tle2426 has "1/2" written on it, praps it's a different pack22:57
katsmeow-afkor is it "1 of 2" , not 1/2 ?22:57
drazakhold on22:58
katsmeow-afkeither way, use another for the OPAG ?22:58
drazakuse another tle2426?22:58
katsmeow-afkyeas, you don't actually need gain there22:58
drazakdoes it have opamp action?22:59
drazakI don't know a lot about the tle242622:59
katsmeow-afkme either, but the OPAG - LMH6321 is all buffer, and vreference and current source/sink, not gain22:59
katsmeow-afkit's headphones, it's hardly hifi23:00
drazakuhm23:00
drazakit's to drive my HD600's23:00
katsmeow-afk?23:00
drazakhifi headphones23:01
katsmeow-afkk23:01
katsmeow-afk:-/23:01
drazakI'm hand matching resistors between left and right channel, etc23:01
drazakit's not a crappy amp :P23:01
katsmeow-afkoohhh23:01
katsmeow-afkok,, then, use another OPALRG , it's a dual-opamp in one pack?23:02
drazakOPALR is a dual opamp, yeah, I don't know if the in/out pinouts are right to go in a dip socket for a single opamp23:02
drazakI'll need to look at the datasheets23:03
katsmeow-afkuse one side for the OPAG, and a resistor string and the other side for the TLE2422623:03
drazakdude23:03
drazakI'm buying the circuit board23:03
drazakI'm deciding how to populate it23:03
katsmeow-afkeither way, if you are substituting parts around from what's said on irc, you're going to redo the pcb layout23:03
katsmeow-afkyou can't drop in a dual opamp pack where it calls for a single, no way23:04
drazakhttp://tangentsoft.net/audio/pimeta2/pguide.html#op-amps23:04
drazakthat's what I mean23:04
drazakso I'm trying to pick a single channel opamp that has similar voltage requirements as the AD82323:05
katsmeow-afkSee below for comments on using a different type of chip in OPAG than in OPALR.23:05
drazakyep23:06
drazakI've read the whole thing :)23:06
drazak"you may be forced to use a different opamp in OPAG than in OPALR"23:06
katsmeow-afkwell, they give parts numbers they recommend23:08
drazakaye23:10
drazakmost of them aren't low voltage23:10
katsmeow-afkbut will they work at the low voltage, not are they speced for a low voltage as their max power23:11
katsmeow-afkthat gnd buffer is supposed to be operational at exactly 1/2 vcc, and not have any rail-to-rail swing23:12
drazakyeah23:12
katsmeow-afklockup on power up is your only concern23:12
drazakmhm23:14
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katsmeow-afki am sorry to say i disagree with a lot of his design there23:16
kanzurehttp://fab.cba.mit.edu/academy/about/23:16
kanzurevocational tech school for the fab lab23:16
katsmeow-afki have found sonic differences (with even current buffers) in any resistance where he has R1 , above 100ohms23:17
katsmeow-afkit's especially serious with fet input gain blocks where you are driving current to charge gate capacitances23:17
katsmeow-afkthe R and input capaciatance is it's own hf roll off23:18
katsmeow-afkbipolar inputs aren't as bad for that, but then you get into offset and bias current requirements23:18
drazakyeah23:19
katsmeow-afki've seen opamps bias up with signal, then drift down to 0v with no signal23:19
drazakit's on parwith other portable headphone amps though23:19
genehackerMarta Male Alemany?23:20
drazakhttp://tangentsoft.net/audio/ppa/amp2/misc/schematic8.pdf for more highend23:20
katsmeow-afki once did a tape deck with flat responce 10hz to 25khz (metal high bias) , dc connection from tape head right to the output jacks, which sat at 0.000v , no offset23:20
genehackerwhoever they invited me to some event and never responded to my response23:21
katsmeow-afkdrazak, i'd use a wall wart, higher voltages, or series 2 "9v" batteries, eliminate the gnd generator, and have a wider choice of opamps23:21
drazakkatsmeow-afk: for at home use and while charging I'm going to use a decent power supply for it23:23
katsmeow-afk2 batteries will eliminate the need for input caps, etc23:23
drazakdecrease portability23:26
drazakand the case for 2 batteries doesn't allow me to use a better pot, so it's not helping me with anything else23:26
katsmeow-afk2 batteries? you are tied to the audio cord anyhow23:27
katsmeow-afkoh,, i didn'tknow the pot was a problem23:27
katsmeow-afktoo bad Fenchurch isn't in #seattlerobotics atm, he'd be who you could be talking to, it's his business23:28
drazakhehe23:28
drazakwell, I'd prefer to use an ALPS RK27 instead of an ALPS RK09723:30
drazakthe RK27 is much, much better, and I could use better input caps23:30
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kanzurehey noah23:31
kanzurewe were playing around with opamp circuits23:32
NoahjAh, I think I might have one of those somewhere around here, I've never done anything with it23:33
katsmeow-afkfunny he doesn't say why not use ceramics in audio paths: they are temperature sensitive and microphonic23:33
drazakkatsmeow-afk: he does, other places23:34
katsmeow-afkok, i didn't see it on this page23:34
drazakhttp://tangentsoft.net/audio/input-cap.html23:35
drazakgah it's not that page either23:36
drazakhe says it somewhere23:36
katsmeow-afkdoesn't matter23:36
kanzureNoahj: was wondering if you could blabber about fab academy23:36
NoahjHmm23:36
NoahjThe official spiel's a lot more informative than I am right now23:36
Noahjhttp://fab.cba.mit.edu/academy/about/ 23:37
katsmeow-afkthe specs on the buffer contradict what he says about loading the opamp output : http://focus.ti.com/lit/ds/symlink/buf634.pdf  page4 shows less phase offset with heavier load 23:38
drazakkatsmeow-afk: he says a couple places that the only ceramics you should ever have in audio are C0G, NP023:39
drazakI think in the page for working with  cranky opamps23:39
* katsmeow-afk nods23:40
drazakand that those aren't ideal, but if that's all you have room to use and you need them23:40
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