--- Log opened Wed Dec 16 00:00:47 2020
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02:39 < nmz787> fltrz: been using a TIA + ADC circuit here for some picoamp scale resolution stuff, with like +/- 250nA range, using LMP7721
02:39 < fltrz> nmz787, nice
02:40 < fltrz> what is it measuring? light signal? gammas?
02:40 < nmz787> nanopore stuff
02:40 < fltrz> oh yes
02:40 < fltrz> do you think using ADC as the feedback resistor is possible?
02:40 < nmz787> I am not analogy enough to intuit if what you're saying is workable
02:41 < nmz787> I've heard some circuits use a capacitor there, and have a charge neutralization reset circuit to reset the cap in lock-step
02:43 < fltrz> that sounds like it might be what I need for a different project, do you have some reference or keyword? or should I google just "charge neutralization capacitor op amp"
02:46 < nmz787> I only heard of it recently and can't remember if the mention included a specific reference, but fig 5 here looks like what I'm thinking https://www.scitepress.org/Papers/2014/47868/47868.pdf
02:47 < nmz787> https://www.ti.com/lit/ds/symlink/ivc102.pdf?ts=1608115627990&ref_url=https%253A%252F%252Fwww.google.com%252F
02:47 < fltrz> also, off topic, but is it possible to change some chrome setting so that new tabs are opened immediately to the right of the current page instead of to the right of the last sub tab opened from the current page? I don't like how I have to swipe over "already seen but not yet wanted closed" pages, if it opened new tabs to immediate right of the current page it would allow to to inspect some of the opened pages, close some, keep others open, return
02:47 < fltrz> to "main page", open new tabs and then swipe to immediately see the new pages instead of heaving to swipe over the already seen pages
02:47 < nmz787> "The IVC102 is a precision integrating amplifier with FET op amp, integrating capacitors, and low leakage FET switches. It integrates low-level input current for a user-determined period, storing the resulting voltage on the integrating capacitor. The output voltage can be held for accurate measurement. The IVC102 provides a precision, lower noise alternative to conventional transimpedance op amp
02:47 < nmz787> circuits that require a very high value feedback resistor."
02:48 < fltrz> nmz787, thanks
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03:03 < fenn> jurvetson seems to be getting interested in anti-aging
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05:09 < fenn> a VC taking a posture against patents: http://www.flickr.com/photos/jurvetson/49902233563/
05:09 < fenn> i wouldn't quite call it "arguing" since it's mostly a quotation
05:09 < fenn> "there is no good evidence that patents are helpful, let alone necessary, in encouraging innovation."
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07:16 < fenn> .tw http://twitter.com/willrop3r/status/1339209367262904320
07:16 < saxo> (1 of 2) NEW. For the first time, @usairforce put #AI safely in charge of a US military system. Call sign "Artuμ," we modified world-leading μZero gaming algorithms to operate the U-2's radar. This first AI copilot even served as mission commander on its seminal training flight! https://pbs.twimg.com/media/EpWe3SsVEAEM4vm.jpg (@WILLROP3R)
07:28 < andytoshi> lol, that's going to be as historic as bush's "mission accomplished"
07:38 < fenn> without a doubt the highest quality video footage of spacex starship SN8's launch, flop, and landing explosion https://www.youtube.com/watch?v=KfMCApWc5xE
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09:47 < lsneff> .t https://link.springer.com/chapter/10.1007/978-1-4471-4510-3_7
09:47 < saxo> Compliant Mechanisms | SpringerLink
09:48 < lsneff> I'm trying to figure out if anyone's designed a PCB-based flexure hinges/compliant mechanisms. Does that ring a bell for any of you?
09:50 < L29Ah> just drill pcb incompletely and you get a thin layer of flexible fiberglass
09:51 < L29Ah> the remaining copper layer won't survive for long probably tho
09:51 < lsneff> from the strain?
09:52 < L29Ah> from repeated bending
09:53 < lsneff> Could mill the copper off
09:54 < L29Ah> well, if you don't need copper, why do you need PCB in the first place
09:56 < L29Ah> but anyway it's well doable, just mind that it sustains fatigue worse than metals, but still useful as lightweight springs
09:56 < lsneff> It's super cheap, and it opens the possibility of having actuators + the rest of the circuit soldered on it
09:57 < lsneff> I'll do some more investigation about fr4 fatigue, maybe other pcb materials would work better
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11:37 < abetusk> lsneff, there's this guy: https://www.youtube.com/watch?v=QhqDf9Qyx5M , though I don't think that's what you were asking for
11:44 < lsneff> It exactly, but that is interesting.
11:45 < archels> haha, thought of the same dude
11:45 < lsneff> s/It/not
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11:53 < lsneff> My reason for asking was that I'm trying to figure out the cheapest way of making a 3dof micro-actuator. There are known ways, but they have downsides and aren't as flexible as I'd like.
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12:11 < abetusk> lsneff: https://mems.ku.edu.tr/wp-content/uploads/2014/08/Electromagnetically-actuated-FR4-scanners.pdf ?
12:12 < lsneff> abetusk: Ah, that's exactly what I'm looking for, thank you.
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12:14 < lsneff> Quite a sparse paper, unfortunately.
12:17 < abetusk> There's also this: https://iopscience.iop.org/article/10.1088/1757-899X/201/1/012016/pdf but I'm dubious as to the claim of 'energy harvesting'. I think the point is that you can do it by cutting out the appropriate geometry and then putting some electromagnets underneath to push and pull the different parts
12:21 < lsneff> Hmm, that is a little suspect, but agreed, the point is taken.
12:21 < lsneff> I'm not super happy with using electromagnetics, but maybe it'd be fine.
12:22 < lsneff> Once finals are over, I'll get some thin pcbs manufactured to see how they work in this context.
12:25 < lsneff> Hmm, looks like boards can be manufactured that are part flex and part rigid; might be useful.
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14:56 < lsneff> .t https://www.reddit.com/r/emulation/comments/isardl/why_dont_we_just_simply_emulate_a_super_fast/
14:56 < saxo> Why don’t we just simply emulate a super fast computer, instead of using actual fast procesors? : emulation
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15:00 < superkuh> Future apple engineer.
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15:54 < lsneff> That user certainly does seem to like apple products
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18:20 < L29Ah> .t https://twitter.com/justindchapman/status/1231336002175717376
18:20 < saxo> Mad Mike Hughes just launched himself in a self-made steam-powered rocket and crash landed. Very likely did not survive. #MadMike #MadMikeHughes https://video.twimg.com/ext_tw_video/1231335888459726848/pu/pl/fuskfxQryNE5vyUg.m3u8?tag=10 (@justindchapman)
18:20 < L29Ah> > Flat Earth conspiracy theorist and daredevil Mike Hughes dies in an attempt to get to space in a home built rocket
18:46 < kanzure> fenn: jurvetson is "one of us"; he was funding the transhumanism space as far back as the 90s
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19:08 < Llamamoe> He made a mistake of trusting technology invented by the same people who invented the round earth theory
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19:08 < Llamamoe> Should have used a flat rocket
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22:52 < Urchin[emacs]> steam powered rockets have been suggested, and there were people working on them, but they're definitely not the usual choice in rocketry
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--- Log closed Thu Dec 17 00:00:48 2020