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kanzure | hmm i think i do pretty okay with 5h 30m of sleep | 03:58 |
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kanzure | "Cthulhu's anatomy is described as part man, part dragon, and part octopus." | 04:11 |
chris_99 | paperbot: http://www.sciencedirect.com/science/article/pii/S0003267007002747 | 04:38 |
paperbot | http://diyhpl.us/~bryan/papers2/paperbot/%0A%20Effect%20of%20temperature%20variation%20on%20the%20visible%20and%20near%20infrared%20spectra%20of%20wine%20and%20the%20consequences%20on%20the%20partial%20least%20square%20calibrations%20developed%20to%20measure%20chemical%20composition%0A%20.pdf | 04:38 |
chris_99 | hmm that's a html file | 04:39 |
chris_99 | actually | 04:39 |
archels | kanzure: how consistent is your timing? | 04:44 |
archels | I think my downfall is usually waking up in the wrong part of a sleep cycle | 04:45 |
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JayDugger | Influx wasn't all that good, but it did have shiny places. | 06:05 |
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kanzure | archels: not consistent. sometimes i take 6, sometimes 8. | 06:15 |
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poppingtonic | paperbot: http://link.springer.com/article/10.1007%2FBF01389186 | 07:46 |
paperbot | http://diyhpl.us/~bryan/papers2/paperbot/36da754a19966c0312b200eb157e77c5.txt | 07:46 |
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chris_99 | nmz787, are you about per chance, i just got a quote for http://njlzbx.en.alibaba.com/product/60190942033-800530746/High_diffraction_flat_filed_concave_blazed_grating.html | 11:49 |
chris_99 | they quoted 1-5pcs $520/pc | 11:49 |
chris_99 | are they on crack?! | 11:49 |
nmz787_i | hi | 11:55 |
chris_99 | hey, that seems stupidly expensive right? | 11:56 |
nmz787_i | not really... for China, it seems a bit higher... but Richardson Gratings (the company serving the FAQs/technical notes I was sending) is at least $750-$1000 | 11:56 |
chris_99 | i thought yours was $100 | 11:57 |
chris_99 | though | 11:57 |
nmz787_i | I think they wanted around $150 | 11:57 |
nmz787_i | did you ever email him? | 11:57 |
chris_99 | nah, i'll do that | 11:57 |
nmz787_i | I think the emails I sent had two email addresses in there | 11:57 |
chris_99 | is From: W michael <michaelaopuc@yahoo.com.cn> the one? | 11:58 |
nmz787_i | chris_99: really though, I'd recommend getting things setup with a cheap $5 grating then upgrading when you find it isn't good enough | 11:58 |
nmz787_i | yeah that was one | 11:58 |
nmz787_i | there was another I think too, more machine-generated looking | 11:58 |
chris_99 | ah yeah i think i see it, yeah i'll definitely start with a cheapo one | 11:59 |
chris_99 | it looks like i probably need around 500 lines/mmm | 11:59 |
chris_99 | to let through the 900nm | 11:59 |
nmz787_i | I guess the other to try might be: leewenho@163.com | 11:59 |
kanzure | we should really pipe alibaba chat feeds into this channel | 12:00 |
kanzure | i'm sure we can get lots of eager suppliers that want to send samples.. and stuff.. | 12:00 |
nmz787_i | we definitely need a chinese regular in here | 12:01 |
nmz787_i | there are a lot of open source projects that I'd like to see them clone and make cheaper | 12:01 |
chris_99 | mmm | 12:02 |
chris_99 | that'd be awesome | 12:02 |
CaptHindsight | nmz787: I've been trying | 12:03 |
chris_99 | ok the first email failed btw | 12:03 |
CaptHindsight | nmz787: have an ordered list of what you'd like to see? | 12:04 |
CaptHindsight | nmz787_i: ^^ | 12:05 |
CaptHindsight | http://www.alibaba.com/products/F0/diffraction_grating/CID1537.html | 12:09 |
chris_99 | yeah i used alibaba, and theres only 2 companies there that seem to sell concave diffraction gratins | 12:10 |
chris_99 | *gratings | 12:10 |
CaptHindsight | do you require concave and what wavelengths? | 12:11 |
chris_99 | 900nm is the main peak i need to find | 12:12 |
nmz787_i | CaptHindsight: not sure what you're asking | 12:13 |
CaptHindsight | nmz787_i> there are a lot of open source projects that I'd like to see them clone and make cheaper | 12:13 |
nmz787_i | ah | 12:13 |
nmz787_i | yeah | 12:13 |
nmz787_i | not really a list | 12:13 |
CaptHindsight | I have a factory 1 hour south of Nanjing | 12:14 |
kanzure | spill the beans | 12:14 |
CaptHindsight | but still in Nanjing | 12:14 |
chris_99 | oh nmz787_i i don't spose you know the diameter of fiber your spectrometer uses btw? they seem to mention 200um in another section of the site though | 12:15 |
CaptHindsight | chris_99: that supplier is in Nanjing | 12:16 |
chris_99 | yeah they're the one that quoted me $500 | 12:17 |
CaptHindsight | chris_99: what are you using for the sensor? | 12:18 |
chris_99 | http://www.aliexpress.com/item/Free-shipping-5pcs-TCD1304AP-TCD1304-CDIP22-Best-quality/1887814216.html | 12:20 |
CaptHindsight | you could use a DVD for the grating | 12:22 |
nmz787_i | chris_99: not too sure, I know that often fiber-coupled spectrometers say that the fiber will act as a sort-of slit (but I think this depends on it being a single-mode fiber, not a multi-mode) | 12:25 |
nmz787_i | so ideally you want a real slit anyway, I think | 12:25 |
nmz787_i | CaptHindsight: openBCI was the most recent example | 12:25 |
chris_99 | aha | 12:25 |
nmz787_i | CaptHindsight: I got a quote on USA-based assembly at about $15 per PCB not including parts (or the actual PCB i think) starting volume of 100 boards | 12:26 |
nmz787_i | CaptHindsight: other interesting projects that need more work is eeg64 | 12:26 |
CaptHindsight | http://www.openbci.com/ | 12:27 |
nmz787_i | yep | 12:27 |
CaptHindsight | http://www.eeg64.com/ | 12:27 |
nmz787_i | it's much further along than eeg64 | 12:27 |
nmz787_i | though I haven't actually tested either | 12:27 |
CaptHindsight | those are easy | 12:29 |
CaptHindsight | was expecting a DNA sequencer | 12:29 |
CaptHindsight | or micron resolution MRI | 12:30 |
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CaptHindsight | https://openbci.myshopify.com/collections/frontpage/products/openbci-8-bit-board-kit $500? | 12:43 |
chris_99 | that's really expensive | 12:43 |
chris_99 | considering the chip is like £20 i thought | 12:44 |
nmz787_i | it's an AVR | 12:45 |
CaptHindsight | they have firmware and a GUI | 12:45 |
nmz787_i | so it would be about $30 assembled with PCB and parts | 12:45 |
nmz787_i | watch out with GUI comments in here! | 12:45 |
chris_99 | i mean the ADC nmz787 | 12:45 |
nmz787_i | ah, maybe so | 12:45 |
nmz787_i | I didn't actually compute a BOM cost | 12:46 |
nmz787_i | so maybe $50 then assembled and all | 12:46 |
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chris_99 | actually looks like the adc is $40-$50 | 12:46 |
CaptHindsight | 24b 16khz adc | 12:47 |
CaptHindsight | 8 channel | 12:48 |
nmz787_i | they quote their noise specs at 70Hz tho | 12:48 |
nmz787_i | which is reasonable I guess | 12:48 |
nmz787_i | higher pink noise in the lower freqs | 12:48 |
CaptHindsight | whats the highest frequency that needs to be captured by an EEG? | 12:59 |
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CaptHindsight | 8khz sampling devices are <$10 | 13:00 |
CaptHindsight | 16khz are 2x | 13:01 |
CaptHindsight | for 8 channels and 24b | 13:01 |
nmz787_i | personally I've never seen anything with high sampling rates, even though I would think that type of experiment would be required for negative hypothesis testing (i.e. that all brain signals are low-freq) | 13:07 |
nmz787_i | so I think sub 1000Hz or maybe even sub-100Hz is pretty common | 13:08 |
CaptHindsight | http://support.neurosky.com/kb/science/eeg-band-frequencies | 13:08 |
CaptHindsight | 50hz max on their charts | 13:08 |
nmz787_i | but you reduce noise with higher freqs and stuff like choppers... but I don't know if they're chopping their signal to do that or not | 13:08 |
nmz787_i | they could have just said "this part says it's the lowest noise available, let's get it" | 13:08 |
CaptHindsight | I just saw the 18khz sample rate and wondered why | 13:09 |
CaptHindsight | yeah, might be | 13:09 |
nmz787_i | CaptHindsight: know anyone at Rigol that would want to arrange a bunch of GHz o-scopes as an EEG headset, then donate all those scopes to hacker/makersspaces after the experimental results were obtained? | 13:09 |
nmz787_i | (my basic philosophy for a few years has been if a cell-phone/radio chip is so tiny, what reason couldn't neurons accomplish the same) | 13:10 |
nmz787_i | but no one really seems to have done an exhaustive search over the freq-space | 13:10 |
CaptHindsight | I'll look it all over soon | 13:11 |
nmz787_i | it seems very reasonable that with enough sampling and sensors, you could get some sort of tomography accomplished | 13:12 |
CaptHindsight | multichannel low frequency logger/analyzer | 13:12 |
nmz787_i | even if all the neurons individually are slow, there might be constructive/destructive interference occuring and pushing things into harmonics... so I think a lot hasn't been looked at | 13:12 |
CaptHindsight | you really just want the data, the GUI can be a laptop, tablet, phone whatever | 13:13 |
nmz787_i | yeah | 13:13 |
nmz787_i | exactly | 13:13 |
nmz787_i | APIs are pretty key I'm learning | 13:13 |
CaptHindsight | http://www.cnx-software.com/2015/04/06/jye-tech-dso138-is-a-23-diy-oscilloscope-kit/ | 13:14 |
CaptHindsight | not 24b but the rest is there | 13:14 |
nmz787_i | even Rigol scopes are 8-bit | 13:15 |
nmz787_i | a search experiment would not need 24bit though | 13:15 |
CaptHindsight | lots of 32b arm cortex code for signal processing | 13:16 |
CaptHindsight | and stm32c are a few $ | 13:16 |
nmz787_i | even some cheap FPGAs now too | 13:16 |
nmz787_i | the ICE40 for example | 13:17 |
CaptHindsight | 16 channel of 12b ADC ~$1 http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1826/PF258964# | 13:20 |
chris_99 | isn't that just a single adc really | 13:20 |
nmz787_i | 24b is a lot more sensitive though still | 13:20 |
nmz787_i | well even the 8 channel originally linked to likely is | 13:20 |
nmz787_i | just the muxers are all real nice | 13:21 |
chris_99 | ah you mean even the Ti one will use muxing? | 13:21 |
nmz787_i | yeah most likely | 13:21 |
chris_99 | aha | 13:21 |
nmz787_i | they'd call them analog switches or somethig | 13:21 |
CaptHindsight | looks like the TI device has 8 ADC's | 13:22 |
chris_99 | oh | 13:22 |
CaptHindsight | http://www.ti.com/lit/ds/symlink/ads1299.pdf | 13:22 |
CaptHindsight | might be overkill | 13:22 |
CaptHindsight | <100Hz at 12b should be fine | 13:22 |
nmz787_i | for tomography you'd need all the resolution you can get | 13:25 |
nmz787_i | all the prior eeg headsets fail because they lack resolution in the data and number of detection sites | 13:25 |
CaptHindsight | I don't see the schematics | 13:26 |
CaptHindsight | and I didn't notice any analog filtering on the pcb | 13:26 |
nmz787_i | https://github.com/OpenBCI/Docs/blob/master/hardware/01-OpenBCI_Hardware.md | 13:26 |
nmz787_i | http://ultracortex.com/downloads/hardware/OpenBCI_8bit.zip | 13:26 |
nmz787_i | from the five seconds I looked at the TI part, it seemed all inclusive | 13:26 |
nmz787_i | 92% reduction in components it said | 13:27 |
CaptHindsight | do you put the subjects into a Faraday cage? | 13:27 |
CaptHindsight | the analog front end in the ADS1299 is nice | 13:29 |
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nmz787_i | CaptHindsight: guess it depends on the application of use... for experiments that sounds like a good idea... for end-users sitting on the couch wanting to type, probably not | 13:43 |
archels | nmz787_i: for my understanding, do you want to do better EEG tomography or do you intend to pick up electromagnetic fields emitted by neurons? | 13:47 |
nmz787_i | isn't that the same thing? | 13:56 |
archels | well, with EEG you assume that the magnetic component is negligible, and you just measure the static E-field | 13:58 |
archels | static in the sense of Maxwell's equations | 13:58 |
archels | in the latter case you'd use antennas | 13:58 |
chris_99 | sorry for being dumb, but isn't the eeg electrode like an antenna | 14:00 |
nmz787_i | archels: isn't the difference just the freqs measured then? | 14:00 |
archels | chris_99: no, it doesn't couple electromagnetic energy, it's just a conductor | 14:01 |
nmz787_i | archels: if so, that's what I was saying earlier, that I haven't seen any experiments where they did the same test at DC or low-freq, all the way up to RF | 14:01 |
nmz787_i | wouldn't you just add a capacitor in the wire to get the non-DC components though? | 14:02 |
nmz787_i | you wouldn't need to be physically disconnected | 14:02 |
nmz787_i | I don't think | 14:02 |
archels | it's not DC in terms of a non-varying signal, it's static in that the magnetic and electric fields are uncoupled | 14:02 |
nmz787_i | ah, well it'd be interesting to see results of both with direct-connection and with an insulator between | 14:04 |
nmz787_i | if the magnetic-influenced stuff turned up something interesting, then that would seem to indicate some capability of wireless | 14:05 |
nmz787_i | (though I have some ideas on evolutionary topics of why wireless might not have happened on its own, due to security risk of broadcast vs point-to-point or peer-to-peer) | 14:06 |
nmz787_i | but there definitely seems to be the capability power-wise with physiologies found in electric fish | 14:06 |
archels | are there any known examples in the animal kingdom of communication via EM? | 14:08 |
chris_99 | bees | 14:08 |
chris_99 | or not exactly heh, they pick up EM from flowers | 14:08 |
chris_99 | to know if other bees | 14:09 |
chris_99 | have been on the flower | 14:09 |
archels | humans pick up EM from flowers -_- | 14:09 |
chris_99 | heh i guess | 14:09 |
chris_99 | *em field | 14:10 |
chris_99 | ah it's called Magnetoception | 14:11 |
archels | "thermal noise has energies (0.025 eV) which are higher than radio wave photon energies (<0.001 eV) (it rules out both controlled creation and detection using molecules). | 14:11 |
archels | Because the intermediate stages are not evolutionarily favoured. That's why. | 14:13 |
archels | Sound and light perception are useful without any generative capability. An organism with a tiny amount of perception for either of these things has an advantage over those without; and an organism with a tiny amount more has an advantage over those with a tiny bit less. This advantage forms the basis for selection and thus improved sensory capabilities (balanced, of course, by the cost of those capabilities). | 14:13 |
archels | Being able to perceive radio on the other hand provides no useful information about the world at low level perception so even if an organism was to randomly mutate so as to detect radiowaves* there would be no selection for this ability, and thus no mechanism to drive the evolution of advanced radio reception. Without the ability to perceive radiowaves there is no possibility of evolving the ability to generate radio signals in a controlled ... | 14:13 |
archels | ... manner. | 14:13 |
archels | I guess cell-to-cell communication with photons is pretty well established | 14:15 |
archels | not sure what wavelengths that is at, probably close to visual | 14:16 |
archels | could be interesting for neurons too, but then you run into mean free path problems getting those photons out of the skull | 14:16 |
kanzure | is nmz787_i still upset about his radioneurons not picking up rush limbaugh | 14:22 |
nmz787_i | I haven't found any | 14:22 |
nmz787_i | (results in the animal kingdom) | 14:22 |
nmz787_i | there is a ton of what seems to be soviet-era misinformation though | 14:23 |
nmz787_i | which slowed down my research quite a bit | 14:23 |
chris_99 | about what? | 14:23 |
nmz787_i | EM comms in animals/humans | 14:23 |
nmz787_i | some photobased stuff | 14:23 |
nmz787_i | some just crap | 14:23 |
chris_99 | does the microwave auditary effect count | 14:23 |
chris_99 | as communication | 14:23 |
nmz787_i | well, any way it gets the job done | 14:24 |
kanzure | many organisms communicate using the electromagnetic spectrum. why do you think people keep complaining about peacock tails? | 14:24 |
chris_99 | and chameleons i guess | 14:25 |
nmz787_i | my feeling really just stems from the point that you could fit a wifi+computer in a lobotomized person's skull space... and the physiology for coding and electrical pulsing exists... so if it hasn't existed it's either too new to the scene for all the pieces to come together into a working system... or it failed early on because simple messages about food and resources would likely have been picked up by different species or something, making the sy | 14:25 |
nmz787_i | s/so if it hasn't existed/so if coded EM comms hasn't existed/ | 14:27 |
archels | chris_99: that's just heating, no? | 14:31 |
archels | nmz787_i: you got cut off at "making the sy" | 14:31 |
chris_99 | hmm i'm not sure | 14:33 |
chris_99 | 'When microwaves are delivered in short pulses, the cochlear tissue in the ear expands.' so yeah i guess it could be | 14:34 |
nmz787_i | 'making the system fail' | 14:39 |
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CaptHindsight | the open BCI eeg can easily be produced for well under $100 | 15:30 |
kanzure | too bad eeg sucks | 15:30 |
CaptHindsight | we need some nanobots to cruise around the brain while mapping and recording | 15:31 |
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kanzure | CaptHindsight: russell hanson wants to use gold nanoparticles to do neuroimaging at a synaptic resolution, but see criticism here (around 18:44 and forward) http://gnusha.org/logs/2014-11-28.log | 15:41 |
kanzure | why aren't there any long distance runners that are injecting insulin through their back or something throughout the duration of the race? | 15:59 |
kanzure | jrayhawk please advise. | 15:59 |
jrayhawk | insulin sensitivity is not typically a problem they have | 16:05 |
jrayhawk | or, rather, insulin insensitivity is not typically a problem they have | 16:06 |
kanzure | no i mean, instead of eating food or relying on stored energy, they can just pump shit into their body | 16:07 |
kanzure | (on-demand) | 16:07 |
jrayhawk | the limitations are in cellular and mitochondrial respiration | 16:08 |
jrayhawk | http://en.wikipedia.org/wiki/Anaerobic_glycolysis | 16:08 |
jrayhawk | they already are pumping shit into their body pretty thoroughly by carb-loading leading up to competition | 16:10 |
jrayhawk | some of them have been playing around with large quantities of artificial slow-digesting starches | 16:11 |
jrayhawk | http://www.google.com/search?q=running+superstarch&hl=en&gbv=1 | 16:11 |
jrayhawk | http://scholar.google.com/scholar?q=running+intestinal+permeability though i do have to wonder how intestinal permeability plays with that | 16:13 |
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cluckj | isn't insulin considered illegal in competitive running? | 16:32 |
cluckj | also too much insulin and even someone with a normal endocrine system will eat pavement | 16:37 |
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jrayhawk | in general, the attitude of "our peripheral tissues are undergoing so much oxidative stress that they're resisting energy uptake signals? welp, better just signal energy uptake EVEN HARDER!" is an artifact of a medical system obsessed with treating biomarkers and drugs that you should not seek to emulate | 16:54 |
jrayhawk | er, treating biomarkers with drugs | 16:55 |
cluckj | haha | 16:55 |
cluckj | yes | 16:55 |
cluckj | giving yourself extra insulin is just gonna give you insulin resistance | 16:55 |
kanzure | i think carl feynman is a vernor vinge fan http://mindstalk.net/vinge/fire.html | 17:17 |
kanzure | although this should not be surprising given his prior involvement with the boston extropians | 17:17 |
nmz787_i | CaptHindsight: this might be a good one https://fail0verflow.com/blog/2014/ov3-hardware.html | 17:20 |
nmz787_i | https://github.com/openvizsla/ov_ftdi | 17:20 |
CaptHindsight | USB Sniffer | 17:23 |
CaptHindsight | https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG-PA/open-source-hardware | 17:31 |
CaptHindsight | https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/open-source-hardware | 17:32 |
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CaptHindsight | http://mobilecg.hu/ failed kickstarter ECG | 17:34 |
CaptHindsight | how do the regulatory approvals (CE, FDA) cost? | 17:35 |
nmz787_i | FDA needs documentation from the ground up | 17:35 |
CaptHindsight | FDA is the big one | 17:35 |
nmz787_i | can't retrofit, technically all the writing needs done fresh when you say 'this is the start of the FDA process' | 17:36 |
nmz787_i | which includes PCB layout and code | 17:36 |
nmz787_i | that's about all I know | 17:37 |
nmz787_i | (worked on one project that was potentially going FDA) | 17:37 |
CaptHindsight | looks like he budgeted ~$100K | 17:37 |
nmz787_i | (that was all considered 'research', just saying that it was 'development' was the crossing-point for when to need to do the FDA-way of things) | 17:37 |
nmz787_i | top comment on that last page is pretty interesting | 17:38 |
nmz787_i | "Hi Mobilecg Team, Great work guys !!! guys need some input from you on Defib protection for IO lines...did this mobilecg pass 5KV defib test ? can you please share your inputs on how to design defib protection for IO lines." | 17:39 |
nmz787_i | " In my current project (ECG device/similar to mobilecg) i am observing that AFE1198 is getting hanged when a defib 5KV pulse is applied and restores back when reset. What could be the reason for AFE to hung,Please help me on this." | 17:39 |
kanzure | apparently you can self-certify for electronics, at least. as long as it is not medical. | 17:42 |
CaptHindsight | http://www.gammacardiosoft.it/openecg/ | 17:52 |
heath | wasn't http://stellar.org brought up previously? | 17:52 |
nmz787_i | CaptHindsight: I would love to see a project like this, except with the LPC4370 chip as the center of attention http://www.banggood.com/DIY-Digital-Oscilloscope-Kit-Electronic-Learning-Kit-p-969762.html | 17:59 |
nmz787_i | CaptHindsight: anything with the LPC4370 in it would be a good choice | 17:59 |
nmz787_i | the only 'dev board' is this ~$20 thing which isn't very hacker friendly http://www.embeddedartists.com/products/lpcxpresso/lpclink2.php | 18:00 |
nmz787_i | the software is a bit much to deal with... but it shouldn't be too hard to arduino-ize it (since they've already done that for several other ARM chips already) | 18:01 |
kanzure | heath: it's just ripple. don't waste your time. | 18:01 |
nmz787_i | although a daughter board for the LPClinkv2 might be a cheaper route to getting it into peoples hands and getting the community support for software | 18:01 |
nmz787_i | http://www.gammacardiosoft.it/openecg/getting_started.htm#specifications | 18:03 |
nmz787_i | not too terrible | 18:03 |
nmz787_i | what's the price? | 18:03 |
nmz787_i | i could probably convert the orcad files to open-source ones | 18:04 |
nmz787_i | oh they also have gerbers | 18:04 |
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CaptHindsight | who was asking about the piezo micro pumps? http://www.microjet.com.tw/en/products/list.php?pin=49600c3d3d05596e2da84e1774f0c398&type=s | 18:35 |
nmz787_i | micropumps are all the rage in here | 18:36 |
nmz787_i | price? | 18:36 |
CaptHindsight | http://www.curiejet.com/en/products/list.php?pin=099861a6e97183485912f85df4e401fd&type=s | 18:38 |
CaptHindsight | http://microjet.en.alibaba.com/product/704293821-215732156/CurieJet_Printer_ink_diaphragm_Micropump.html | 18:40 |
CaptHindsight | nmz787_i: <$50 | 18:42 |
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kanzure | hmph | 20:40 |
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kanzure | .title https://news.ycombinator.com/item?id=9345340 | 21:04 |
yoleaux | Amphetamines Are Hiding in Your Supplements | Hacker News | 21:04 |
kanzure | okay with me | 21:04 |
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andytoshi | oh, that reminds me to take my iron pill | 21:19 |
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