Open Source 8.5 Digit Voltmeter from CERN: Build and Test

[@sethphillips4779]

I didn't understand 80% of what happened in this video but it was one of the most satisfying things i've ever watched.

[@wiky1492]

especially the inserting cassette part ooooh

[@change_your_oil_regularly4287]

You understood 20%? I'm impressed! I didn't understand 99%. I'm pretty sure he's talking in Klingon.

[@eddiebernays514]

im glad im not the only idiot not understanding but enjoying.

[@simonsimon3907]

same with me im not even sure what its supposed to do really but i did watch the whole thing :) and enjoyed it i think ! wouldn't want to watch to meany or often but interesting.

[@ouadlabart9481]

Didn't get much neither, but have to admit it was pretty well explained

[@lmamakos]

I have not seen DIY vapor phase reflow soldering before! The potential lethal danger adds that special level of excitement!

[@Killerspieler0815]

@lmamakos - Yes, it´s a bit "ElectroBOOM", but more chemical than electric

[@BrainGuy]

I feel like a phone sex operator just spoke to me in pretend English for 35 min. I enjoyed every second.

[@mitch3064]

I never had electronics and porn confused with each other before this.

[@CristiNeagu]

And then you get to 5:41...

[@danishdart]

@@CristiNeagu Or 6:53 "expect intense satisfaction"

[@mvassileiou]

@@R67K hahahahahahaha!! Duke Nukem was my favorite!

[@brendanwood1540]

It's like being a lucky TEC bastard living right in the middle of a precision sandwich filled with sweet erotic technical jargon.

[@Cerv3ra]

Oh Mr Reps I have missed you so much

[@dercaradas]

i like how the vid is like 54 minutes old for me and you commented is 3 days ago on a video starting with black holes

[@niikuragen]

4 days ago??

[@ViniciusMiguel1988]

We miss you too Jordi

[@xDevscom_EE]

Need moar ppms! Nice work and thumbs up for CERN folks for pushing DIY metrology forwards!

[@Daweim0]

or is it fewer ppms?

[@redtex]

Cancel all ppms at the legislative level and to penalize for ppms.

[@user-xd3en9mm5x]

I understand so little of what you are talking about but can totally appreciate taking on a project of this size! Very well done!

[@leonardmilcin7798]

I am an amateur but one thing I designed for myself was rather ridiculously overengineered controller for espresso machine. This isn't simple PID but rather it uses thermal model of the entire device, moving horizon estimator to run that model 50 times a second and kalman filters to continuously correct model parameter changes over long periods of time. It is precise enough to give accurate estimate of the amount of scale in the boiler! One challenge was building an ultra low noise and high precision thermometer in a harsh environment (moisture and huge temperature gradient). The thermometer had to resolve 1/1000th of a degree to get fast and accurate measurement of temperature change rate. In the end I figure out that the biggest problem wasn't even the temperature difference (could be accounted in software) but rather temperature gradients. I split the design to a power board which contained power supply and triacs to turn on/off heater, valves and pumps from the sensitive measurement board and I built 4 layer enclosure to envelope the sensitive board with a shield that alternates layers of copper and thermal insulator (from inside: copper, foam, copper, foam). I then had a temp probe mounted on board and used it to compensate results. In this case the actual absolute results don't matter much (it does not make a difference whether water used to brew coffee is 0.1 degrees hotter or colder) but rather I needed fast and continuous measurement of rate of change so that I could predict to less than 0,5s when to reduce the heat from full power and to what level so that predicted brewing temperature is achieved as quickly as is possible and then kept stable without any over or undershoots.

[@davidkissling4093]

are there more details of that project or public resource? Sounds interesting.

[@leonardmilcin7798]

@@davidkissling4093 Nah, it is just my first project to learn some electronics design, have something with a real board and integrated ARM, etc.

[@borisj4054]

Did you get a good coffee at the end?

[@kaasmeester5903]

Sometimes the journey is more important than the destination :)

[@233kosta]

Did the coffee taste 10% better in the end?

[@axel3264]

"Few hundred thousand dollar assembly line" *Looks nervously at the two students tasked at soldering 200 boards by hand*

[@wesleymays1931]

They're being paid $40/hr though

[@TheNille02]

@@wesleymays1931 where? you pay them to much. they are competing and do the job even vor $4/hr

[@quistador7]

@@wesleymays1931 nah we have an SMD plant near me and the soldering stations make $18/hr

[@brendanwood1540]

@@quistador7 No way should people solder SMDs by hand in a production plant. I'm skeptical. Not when there are machines with SMDs belt fed in strips that can do a whole board in a fraction of the time.

[@brendanwood1540]

@@quistador7 Better question: Who would buy a product that costs 8 times more money and is less reliable due to inferior soldering consistency and precision?

[@K.D.Fischer_HEPHY]

Glad you can profit from the open sourced equipment designed for fundamental research. Thats one reason why research is important, in my opinion. You went full out with all the components. No cheap session at all. Very nicely done Mr. Reps.

[@Slide100]

You got an LOL out of me with the line: “It can’t be that hard, can it?” Beautiful piece of equipment. Throughly enjoyed the build.

[@VincentOlivier]

I, gentleman, hereby manifest my interest in some Marco Reps bath water.

[@Karebear9001]

Also us ladies!

[@TheGodCold]

So, electrolyte?

[@VincentOlivier]

@@TheGodCold The kinkier the better.

[@petermuller608]

I would prefer bathwater of that ADC!

[@Mr_Wh1]

I will gladly cover the cost if you drink it on live feed.

[@ddavity]

- Ok, time for bed * Another video of Marco Reps pops in KZbin * - You know? Still some minutes for another video

[@TMS5100]

I love LEMO connectors. Incredibly expensive, but widely used in medical instruments for very good reason. The quality is unmatched, and you can get ridiculously small connectors with amazing voltage and current specs.

[@zachbrown7272]

yep. I've worked at companies that use LEMO connectors for as much as possible, and they are amazing.

[@MrOwen27]

Yes they feel great

[@killertoast96]

What a funny, informative and interesting video! Your level of skill and diverse talent is just so inspiring! Really love your channel, please keep up the awesome work

[@RobertGracie]

When Mr Reps said "straight FROM THE ARCANERY" was the most memorable bit for me :D but his voice is pure ASMR!

[@sykskysyk]

ONE OF MY FAVORITES

[@asdfg3421]

invoker

[@Bastian-Remi]

It's a sampled quote from the Invoker character from DotA 2

[@nerveseus7069]

Its invoker voice line from dota2 xd

[@shingGOLDmonkey224]

If you’re looking to improve that linearity, polynomial regression is probably a poor choice for the calibration curve due to that “wobbliness” you talked about with your tenth degree function. You can avoid that, along with reducing computation cost and error by using cubic splines. In layman’s terms they’re glueing together third degree polynomials to form a smooth continuous curve without any ugly wobbles. Hope that helps! 🙂

[@xandermay]

Yeah the tenth degree functions should be way over fit to the data no? Thats what would be causing the wobbles

[@BrotherCreamy]

The point of the 10th degree polynomial is that he's trying to compensate for as much of the repeatable non-linearity as possible, so that he can determine an accurate figure for the non-linearity of subsequent measurements.

[@shingGOLDmonkey224]

@@BrotherCreamy That’s correct, he’s using a polynomial regression to compensate for known error between the ADC and calibrator. I’m suggesting that instead of using a polynomial regression, he should try using cubic splines as they are cheaper to compute and don’t have the inherent instability of polynomials. It will still accomplish the same goal (mapping a continuous mathematical function to discrete error data) but it will do it more efficiently and without unwanted wobbles in the function.

[@grantmuir9660]

@@shingGOLDmonkey224 I agree - 10 degree polynomials are almost sure to overfit. i like your method better with little chance of overfitting.

[@88njtrigg88]

Ohm law eat your heart out. fm.

[@firstmkb]

The dry delivery had me smiling, but the ring had me laughing out loud! This was phenomenal work for someone working at home, and at a level of quality I'll never see.

[@gymprofessor329]

This is absolutely hands down the most impressive video you have ever made! Wow! Mr carson's lab quality process and signal path level circuitry. Amazing. I'm glued to my phone haha

[@PhG1961]

'Not always so serious video'.... it's that kind of German sense of humor that keeps us going ! Much appreciated. Excellent video all together !

[@Hilde_von_Derp]

That feeling when you take 30 minutes of your day to bask in the raw magnificence of a beautiful machine coming together. Wonderful work Marco and nothing but love to CERN for open sourcing this. Magnificent work by everyone. Thank you for sharing.

[@CKOD]

For the front panel, look into Alodine or Iridite chromate conversion coating. If you know what alloy the front panels are made of, you may be able to find an anodizing house that can treat them for you. They both can be specified as electrically conductive, and would be suitable for your ground contact, while still protecting the aluminum. If youre feeling extra spendy, you can have done with a mask so the main portion of the panels are anodized, while a contact ring on the back side is a conductive conversion coating. Or get them nickel plated. Polished first, if youre feeling a bit garish, brushed or sanded if youre not.

[@absurdengineering]

Although I’d advise against DIYing chromate. It’s the sort of stuff you want to keep as far away from home and your body as possible.

[@FRobot-rx4kz]

What!? Vapor phase soldering is a thing? -You just sent me down a rabbit hole...

[@buggi666]

Yes for a long time. As a student in University I was using such machines in 2006. That liquid is pretty nasty :-(

[@kasparroosalu]

@@buggi666 How is it nasty? Shouldn't it be perfectly inert unless you overheat it?

[@buggi666]

@@kasparroosalu You are right but overheating can happen easily depending on the pressure and heat distribution within the vessel...

[@drojf]

While I knew vapor phase soldering was a thing, I never knew that you could do it with such a simple setup...I don't think i will attempt to repeat what marco did though...

[@gordonlawrence1448]

@@kasparroosalu It sits in your liver like Tetraflouromethane does and screws everything up.

[@boris4231]

16:37 a thing of beauty a joy forever

[@beardedgaming1337]

i work with car electronics. hobby is amp repair. i must say, im disappointed I did not find your channel until today, VERY top notch content! you are also an EXCELLENT Technical narrator. you should offer to voice over technical training videos for freelance side income - i know the training videos i have to sit through would be much high quality with someone of your caliber

[@benjamincolumbus]

Enjoy your PPMs Marco, CERN has blessed us

[@rulesofimgur]

I don't know why but I keep coming back to watch this video. Screw "low-fi beats to study/relax to" I want to see Marco build this damn multimeter

[@____________________________.x]

I'd never come across vapour phase reflow before? and the cutting edge techniques in this video were fascinating. It must be such a personal achievement to build something like this, and how amazing that CERN continues to drop all these advances back into the wider community.

[@anonimousbarby3481]

Vapour phase reflow soldering is very common in the electronics industry, but doing it homebrew like he showed is new to me. And kind of dangerous if you ask me based on the side comments. I have seen folks do reflow in toaster ovens, but the vapour flow has better uniform penetration.

[@____________________________.x]

We used to make PCAs, our machines were the molten wave type (whatever the technical term for that was)

[@johng8pef11]

Here in the UK, I used to do vapour phase reflow back in the early 1980s, when SMD cmponents were a novelty. It was very popular for small-scale production as it was both easy to set up and made for a compact installation. Unfortunately, it fell out of favour as infra-red reflow 'conveyor' ovens became more popular. This was mainly because the VPR tanks, at the time weren't very environment-friendly - the process tended to use CFCs as the heat-transfer medium, which caused a general problem with 'lost' vapour, and a specific problem for the user, as the decomposition products of the vapour, if it came into contact with something hot, for example, were highly toxic. We had a couple of occasions where the operator had ignored the 'No Smoking' signs and drawn a lung-full of the vapour through a lit cigarette (yes, those were the days when you were allowed to smoke at work🤣) and essentially gassed herself to unconsciousness... Good to see it making a comeback, with slightly safer fluids 😃

[@____________________________.x]

@@johng8pef11 I looked up the chemicals for this, and they are incredibly expensive

[@johng8pef11]

@@____________________________.x yes, they are fairly expensive, but if you’re doing it right, you shouldn’t be ‘consuming’ much of it, so it will last a long time.

[@ftt2757]

Damn i love this time of the year when Marco uploads video

[@bezocivec]

".. or with an angle grinder, if you are THAT guy." I lost it there

[@absalomdraconis]

@Peter Mortensen : Strike was once a thing as well.

[@Baracurava]

Such perfection, components, voice and manufactoring made my life

[@wktodd]

You didn't cnc engrave the front panels?

[@petermuller608]

Wow I love your enthusiasm! Having the balls to invest 2k BOM into a voltmeter is some heavy engagement. And your humor is just unique!

[@Andres131995]

The lord of ppms has returned. Didn't expect any less, and you brought this on yourself.

[@Nono-hk3is]

I'm actually glad you only post a video every couple of months or so, considering how much psychic damage I take from each one. It takes nearly a month to completely process all the new things I learn each time.

[@peterkutas1176]

WOW, that DIY vapor soldering technique was brilliant, no need for an IR oven...

[@hullinstruments]

Holy shit it’s like Christmas! I find you in every deep dark corner of the KZbin comments sections…metrology and 8.5 digit videos. So I know you’ve been around. Glad to see you finally came back to your own channel! Now get back to the lasers… Pronto! You can’t just buy a bunch of nice fiber lasers like that and then let them sit around 😂 It’s your fault I didn’t get a newer truck this year. But I do have a few nice fiber lasers (bought for pennies on the dollar on eBay. But still expensive). And soon I will have my 8.5 digits of glory recalibrated and displayed in all of her beauty. A year ago I was completely happy with my trio of 34401A meters. What have you done to us!? You and Mr. Carlson are the only ones I’ve ever considered and I’m glad to donate/join patreon

[@voltlog]

I'm excited to see the results from the DIY vapor phase reflow setup 🚀

[@mikeorjimmy2885]

I kept thinking of sending someone to get a bucket of condensed steam.

[@tejonBiker]

I remember the talk of a doctor in physics at my university, he says: in CERN they have some of the finnest electronics working on the experiments, I never understand what exactly he refers with finnest up to now with this video, thanks for sharing your effort and for the pleasant build.

[@killsalot78]

marco you absolute mad man hand placing all of those components, color me impressed

[@BigAlz11]

Wow, just wow. That was pure art. Better than any Hollywood blockbuster. Great script. Wonderful humor. Thank you.

[@ZacksLab]

"now we are powering up the sugar fueled AI pick and place inspection machine" 😂

[@zachreyhelmberger894]

LOL!! It can adapt to changing conditions and solve problems so well!

[@nghtrdr]

Marco, you need to do more vids. We miss your soothing voice and witty commentary when you don't. My wife, who knows nothing about electronics absolutely loves you! She will be ecstatic when I show her this new vid. Thank you

[@juststeve5542]

Holy cow, this is some next level nerd porn, I need to take deep breaths and sponge myself down with a damp copy of practical electronics from 1972. I'd also like to know how you train your dogs to harvest such accurate components, mine can't even manage to find a stick she's capable of carrying without tripping over it!

[@reinokotze]

I am developing a tig welder. And as a mechanical engineer i appreciate all the electronic engineering and references on the tube.

[@John_Smith__]

Another great video and I did not even knew CERN had such great project as an open-source! Great once again !

[@reps]

And there are many more: ohwr.org/welcome I already have parts and PCBs for another one here :)

[@John_Smith__]

@@reps Super Cool Marco! thanks once again for your great videos! Keep it up! The only Thing I really would not make is your SMD solder process ... I mean ... it's ok but ... a small oven with quartz heaters is very inexpensive and we can get a simple SSR and a arduino Pro mini to switch it in order to make a correct temperature profile for the solder process. just sayin' ... just sayin' ... But Great video once again!!

[@excitedbox5705]

you can use the fpga like a DSP and program your signal processing function in hardware. That will get you plenty of speed to do the processing as long as you have enough cells.

[@Beredro]

Since you get that much Samples with some Noise, you might look in to "ADC Oversampling" instead (or beside) using a simple averaging. I'm no expert, but that way you can boost the ADC Bit count and smooth it out at the same time

[@JTL-DK]

Normally i would say that Marco is way too geeky and "dry" for me to find interesting, but your "dry" humor and entusiasm seriously hooked me on this channel!

[@DeusExAurum]

When can I preorder the Engineer Bathwater™?

[@thornwood999]

In the software section I could not help but think about machine learning practices with the polynomial fit that was implemented. I would recommend reading about overfitting and underfitting. But also the fixes for that: testing and validation data sets and cross-validation. This would give some insight in whether the numpy fit was actually any good in explaining the variance in the data, without being too sensitive to this data.

[@benmodel5745]

Great results! And wow that BOM cost 😮

[@jan.tichavsky]

TBH I'm sure someone like Marco with his skills can afford that. But for me BOM would be the easy part, designing the enclosures and putting everything together would be hard. And you've got to have all the fancy gear for that :)

[@lmwlmw4468]

I worked with those LEMO connectors ...... awesome material. Great work.

[@Hiasibua]

I'm looking forward to a shot of you and the dogs on a walk through yellow blooming fields as the intro for a 3D printing video. And then a text on the screen: "RepsRaps" 'tschuldigung

[@DMoRiaM]

You video popped here out of nowhere, but as it was about a voltmeter open sourced from CERN I became curious. Oh boy, the best thing about know another language is to be able to learn different things from different places. That was really a enjoyable video to watch and your narration with that's suspense intonation was at the same time engaging and hilarious. I loved the small cracking jokes. Thanks for the great peace of work. Regards from Brazil!

[@circuitsandcigars1278]

I used to work in the production of thin film resistors for a company now owned by Vishay. It's actually a neat process to watch

[@phrozenwun]

On a personal preference note, I don't usually like high priced builds without a specific purpose. This was somehow an exception and very enjoyable - perhaps because promoting open standards is dear to my heart. So thank you for this, please carry on.

[@xKatjaxPurrsx]

"Kinda makes me want to get back into modular synthesizers" PLEASE DO! (I'm building one too :)

[@JohannSwart_JWS]

Great project Marco. A bit off topic, but your CNC work is spectacular. All that micron chasing earlier seems to have paid off.

[@twin9408]

"it's kind of a trough, for humans"

[@helmanfrow]

I never know what you're talking about but I can't stop watching.

[@EstorTuguita]

Oh, Invoker's voice. Sometimes I forget you play some Dotes. Hope you like the animated series

[@oriole8789]

This is all exceptionaly impressive. Lots of new techniques, cool equipment and strategies. Bonus points for torx fasteners. Thank you for showing! You should really start a company around your skillset if you haven't already. You would probably do very well, and over time that position would allow you to make even stronger content and establish better relationships with various larger companies. Low and medium volume production is quite different from single projects like this, but I think you have the right kind of personality to be able to optimize it to be profitable while maintaining high quality. This channel would give you the necessary marketing. Kind of what Doug DeMuro did with his "cars and bids" site/business. Regardless, thanks again and good luck!

[@thomasw6169]

People like him and ben krasnow always make me feel incredibly dumb. I couldnt even follow crudely how this thing works.

[@floorpizza8074]

I didn't understand the vast majority of this video. But Mr. Rep's amazing voice and his sense of humor kept me watching til the very end.

[@UMBerto-wj7ch]

‚..one has to resist the urge to eat that yellow snow‘. -> Zappa spotted

[@aarondcmedia9585]

Yay convective tombstones!! Your Rube Goldberg reflow technique is on point. Love the content, please keep going.

[@TechGorilla1987]

God I miss your humor, my friend. I really enjoy when you upload.

[@jimsvideos7201]

The finer points escape me, but I admire your passion for precision.

[@pitushi]

Finally a New Video !! Keep up the Awesome work !!!

[@SaNjA2659]

I came. Seriously, though. I've been looking at the HPM7177 project and that EEVBlog forum thread in particular ever since getting my hands on some of the AD7177 devices. Such a brave approach, as it is implementing (and rather successfully) all of the taboos volt-nuts tell us to stay away from: Peltier temperature regulation, off-the-shelf Delta-Sigma ADC chips (as opposed to custom multislope converters), let alone attaching an LTZ1000 to one of them in a way that doesn't compromise its performance. It was also awesome to see you successfully caliblate out the chips non-linearity. I always wondered whether something like this was even possible, or whether the INL plot presented in datasheets is actually full of spikes and discontinuities, and would be impossible to calibrate for. Instead of solving a high-order polynomial for every value, it might be better to pre-calculate points in advance using your polynomial fit into a look-up table and interpolate between them (or maybe even solve for every ADC count! If I'm not wrong, the entire table would be like 16GB total, which is nothing by today's standards). Really looking forward to you digging further into the firmware aspect of these systems. It should be possible to set these chips up for slower acquisition times, making use of their built-in digital filtering which will be quite an upgrade compared to plain averaging in many ways (e.g. 50Hz rejection). Wonder how close you'll be able to approach the 24.6 flicker-free bits of resolution the datasheet advertises.

[@Aidan_Lawrence]

I personally find that solder paste in a tube is worth the slight loss every time you use it compared to the tubs of the stuff. I've noticed that the continuous exposure to air dries out the flux in tubs of paste, and even when you rejuvenate it with a bit more liquid flux, it's still never "factory new." I always get near flawless reflows with minimal bridging when using paste out of a syringe. In the end, I always use up the entire tube of paste while the tubs have to be thrown out prematurely.

[@sanches2]

Because of you and a friend of mine i switched my pcb proto manufacturer to pcbWay. The are awesome! One has just to keep an eye on his / hers email. Cause if you place an urgent order and they find an issue you shoukd be able to respond immediately. Perfect boards and the price is günstig :)

[@boltzbrain3039]

Just here to say, that i love your videos and you are everything i strive to be some day. Also nice Pirate Party Card :D

[@jan.tichavsky]

Cool to see such old school Pirate Party card. Greetings from Czech Pirate :)

[@vishaltakodara1508]

Technical, Hilarious, Fun, Informative, Spicy best Tech channel I have come across.

[@hylacemess]

Better not use the "tub" solder paste servings. They dry out much quicker than a hobbiest can use them up.

[@gordonlawrence1448]

I buy the smaller syringe ones. Even then only 1 or 2 at a time and keep them in the fridge. I only really use them with copious additional flux for hand soldering TSSOPs. I really should start getting to grips with BGSa now.

[@motherjoon]

I always learn something new with every new reps video

[@powerupminion]

10:13 cracked me up!!! I was not prepered..! xD I have tried that; Hurts nearly as mush as stepping on a logo! ]:-)

[@71dembonesTV]

You're a genius; both of the engineering and comedic variety. Subscribed sir

[@N1gel]

I didnt realise that CERN released their designs but making them available for self production is truly wonderful. Your manufacture and walkthrough is similarly wonderful. Thank you. I suppose next thing is to bin the FPGA and replace it with a re-programed Tesla AI chip, to get another 3 digits of resolution? 1pV you would need to dig a big underground well screened room to be able to use it.

[@ReneKnuvers74rk]

About the linearizing polynomial and it being done inside the meter: jam I pi in one of the open slots of the 19" rack, use some USB interlinks on the front (or redesign the PCB's to rout USB over the backplane) et presto: your most linear multimeter is there. Add an oLED display for true 8.5 digits...

[@wader669]

"get back into modular synthesizers" when did you leave? and why?

[@dpsilver1]

i am not an electrical or electronics engineer but yet i find myself here every time you have a video, the jokes and the humor top notch my only question is what kind of savage would dislike this video...must be the guys that work for the other company that isnt Vishay

[@shawnbottom4769]

Yeah that Keysight giveaway, it’s qualifications for entry are extraordinarily limited. Unless I’m going to lie. And I’m in a profession that uses their equipment. Except none of it is Keysight branded. Wonder why?

[@1900OP]

probably for them to not get stolen xd

[@aneeshprasobhan]

are they agilent ?

[@Drew-Dastardly]

Are there new qualifications? In the past it all seemed to be based on international ludicrous tax laws on gifts (USA included) and prizes. So only countries that aren't total assho' could be involved. Then import duty and sales tax laws. Essentially if you have a Keysight office in your country then the device could be imported from Malaysia or wherever to there at no cost and then sent on to the winner with no tax/duty burden. Except USA which has a bizzarre gift tax.

[@mattvoce1091]

I can’t believe your incredible knowledge or how you achieve what you do, but hats off for a brilliant journey into the depths of physics and electronics so far removed from the average enthusiasts mental capacity. Well done. Brilliant!

[@matth8355]

The utmost level of reverse engineering. "Reps-lication"

[@vibrolax]

Use orthogonal polynomials, e.g. Legendre or other for the interpolating polynomial. The number of zero crossings of the function gives you the number of terms you need and will exhibit great numerical stability.

[@alexroge6495]

“Expect intense satisfaction” .. noted

[@RocketSailing]

Never stop make vids like this! Over my skill level. But I truly enjoy both the voice and humor. Combined with great content. Its Awsome!

[@MazeFrame]

Reichelt is a very dangerous place! Never ordered so much stuff I don't really need.

[@alex-r2pi]

Pfff, not comparable to AliExpress...

[@IrrationalRecreation]

An astoundingly ambitious project and build. Very impressive.

[@martin128]

I am too stupid for this

[@dannybeckett01]

You could use a LUT instead of a polynomial to correct the voltage & interpolate between values. More flexible and much less processor intensive

[@SplicesAndCelluloid]

10:17 Hurt my soul. I don't care if it's not real.

[@gorgonbert]

I understand maybe 1% of what this thing is and does... but it’s amazing to watch nonetheless... thank you for sharing 🙏

[@deviljelly3]

Your sense of humor is nearly English level.

[@beautifulsmall]

Never knew about low noise metal foil resistors, eyewatering prices compared to thin film. So many great features and techniques to push the noise floor down. Great work. Subscribed.

[@fletcherreder6091]

That is a sexy _SEXY_ piece of hardware! I want it in my life so bad.

[@bretcannon3826]

Impressive video! Have you considered using Allan Variance/Deviation to analyze your long strings of readings. This technique was developed to analyze stability of oscillators for atomic clocks, but also works for long strings of other numeric data. Besides showing how many points to average for minimum noise, it can also show long term correlations due things like line frequency and day-night cycles.

[@ashajjar]

wtf ... I spent 30 mins watching something I can barely understand ... hat off to your dedication mate :D this is a lot of work

[@samheasmanwhite]

It may be possible to calibrate the linearity of the device using only two precision voltage references and a high stability resistor and capacitor. If you charge a very high stability capacitor up to a stable voltage reference, then flip the polarity of the voltage reference to discharge it through a precise resistance, then the measurements you get should fit a known curve over time who's linearity only depends on the voltage reference and the stability (rather than the value) of the RC components. The second reference should be a slightly lower voltage that you start and stop the timing of the measurements at since the switch at the beginning and the tail at the end of the curve are unusable. I am not familiar with how linear this could be in practice, but if the resistance is stable and the capacitor is linear enough then it seems practical to me. Also the measurement could be repeated in the opposite direction which may allow non-linearity or leakage in the capacitor to be cancelled out, I'm not sure what what the non-linearity of precision capacitors looks like though.