EEVblog #1034 - Mailbag

hi welcome everyone's favorite segment mailbag yes we haven't done one in a while so let's get to it this one is from no starch press they've had several sucks of the South here on the EUV blog I don't need this because it's got a full time um yes so we know what's in here from no starts press now I'm gonna use this alright thick yes this is the envelope stuff really tough stuff anyways the Arduino inventors guide Luanne le Thomas by making ten awesome projects let's have a quick check all right let's have a look at the Arduino inventors guide it's actually by our spark fund so I seen that Brian and Derek work for spark fun and there you go Brian was a our school physics teacher are with the finish robotics Derek is a middle school technology teacher obsessed with pushing the limits etc and there you go let's have his squares it's basically a a project-based book so they go through ten different projects and by the way the book is twenty nine ninety five Yankee bucks and includes the digital one as well and the index is quite comprehensive each individual project well I mean it's you know it's three hundred and thirty yards three hundred and ten pages long so let's take a look I mean we'll just show you we just jump through the project ten shall we they're all gonna be very similar materials and stuff like that lots of very good photos what is a membrane potential I might look at that piezo buzzers building the circuit we've got our requisite breadboard interface to Arduino type thing program in testing we've got some code there we go got some Arduino code what you get in the console and some creative specific no it's not a huge amount of detail on like it's just mainly you know programming with the Arduino bid on solder in things like that so flicking through it's like you know yeah there's some Arduino code and stuff like that they do mention a couple of you know like electronic concepts and things like that but basically just how to wire up the pre-programmed the pre-made kits and stuff like that and getting them going step by step which is fine but it's not something that you would want if you want to learn electronics or something like that it's just you know how to build this particular project so there's not a huge amount of value in there unless you're actually building the projects so there you go it's a fine book that put a lot of work in towards very nicely produced as you expect from Martin no starch press but yeah it's not you know and yeah but you've got a pony you can't just buy the book it's pretty useless on its own you've got to our pony up for the projects as well but that's another quality art no start to press a book and if you want to check it out link down below thank you very much Lee see ya saying I'm silent I may be from Singapore I'd almost Singaporean viewers I love Singapore so probably it's my favorite Asian stopover destination on the way because if you go there's only two directions out of Australia and if you go one way I'm you got to go um Ava basically well if you're heading to Europe you probably go I'm Asian so thank you very much I like the feel of this cuz it's obviously going to be a PCB and yes it is ah programmable timer switch jeez that's sizable isn't it so Lee is from Malaysia big fan thank you very much working on our small projects involving some pics it acts as a timer switch just finished the PCB which I wish we could take a look at this is the first time designing circus Norrish off the selected components and their values are suitable especially the decoupling is switch decoupling capacitors correct if you find any mistakes on the layout let's check it out all right first up your power supply section you've got a series diode in there and no worries it's better than like a back to back diet across here which shorts out your supply if you get the polarity backwards if you can afford the voltage drop are than 0.6 volts across they're all one volt you know it's like an airport ever um then it's better to have it in series because if you plug in in backwards that just you get no Karen oil rather than just shorted out 680 Micah's problem quite high for the input um you generally don't need that for just input stability on a regulator like this then yeah you don't you don't really need that now as for the regulator here the LD trip 175 this is a low dropout regulator and these are less stable than your regular like 7805 ones for example you need a specific type and size of output capacitors to uh you know you make it work it's not a problem but it's just that when you've got a nine to twelve volt input I wouldn't be using an audio here once again it's still going to work just fine but I would be just be using big as five volts out just a traditional 7805 no worries whatsoever and as I said you don't need that bigger input capacitance and the Apple Kappa you've got the hundred n ten Mike and 4.7 Mike and I can see on the well there's no plus Mike on there so these are all going to be a ceramic caps and really there's no point to doing that especially like something like the four point seven and the ten next to each other the so near to each other then they're not like an order of magnitude a decade apart you don't really need that so yeah you I don't know whether or not you got that from the datasheet or not but I doubt it now these could be spread across the board of course it's typical to put the your multi bypass caps just on the output of here instead of I don't recommend it but a lot of people do that are guilty of it myself occasionally but they're not spread out across the board here it is um they just threw all three in parallel like that right on the output of the regulator and there's just no point to that it would have been fine with just say a ten Mike if it's an L do it needs you know one Mike minimum output capacitance or something like that all the single four point seven you didn't really need the other ones and also notice the really large loop area here that I've highlighted in green the ground of those three capacitors to get back to where it actually needs to be which is the ground pin pin number one of the u1 voltage regulator there it's to loop all the way around see one like that go right back through the input go through that little slither there go through d6 and then up to the pin like that and loop area is one of the big traps for young players in terms of PCB layout and you know EMC and the whole electromagnetic conformity thing now I won't go into the technical details of loop area but is one of the worst things you can do in PCB layout is to have large loop areas like this and it's something that beginners get wrong all the time because they don't know about this sort of thing and if you read the layout application notes especially for switching regulators are really good if you look at a good any almost any good datasheet for a switching regulator will talk about loop area and show you example PCB layouts how the ground return of your bypass caps must be as close as physically possible to the ground pin of your regulated device in this case we've gotta learn L do so those three capacitors should have been like flipped over so that the grounds are on the bottom and then it just returned it returns straight over to the pin number one a view one there or as I'm going to mention later you can do our via stitching in there like heavy duty via stitch II but in this case you didn't really need to do that so it's important to put in this case at least one that 110 Mike is in the example application note across pins directly across as close as possible pins one and two of you one voltage regulator especially for these LDOS they can be quite susceptible to oscillation and things like that so having a large loop area like this may cause a regular light this to be unstable but in this particular case we don't have heavy loads we're just driving a microcontroller and it you know it's not high frequency switching stuff so it's most likely with 95 percent certainly gonna work but hey they'll be from that 5% of time when you're coming out sir and the thing isolates or you get some other issue so yeah loop area look into it and we'll go over to the microcontroller schematic here the next thing I'm going to check is like the bypass caps on the micro to see if you've actually got them and yes you do there we go we've got to 100 ends there that's fine because we do actually have two different power pins here and if we have a look over on the board are they close yep see 10 and yep so yep that's fine and dandy having those reasonably close to the power pins you've got them a little bit away but for this it's not going to matter at all the other thing I notice about your board here is that you've used what looks like oh six oh three parts everywhere why you do that on such a well otherwise quite largely through whole board there's lots of other through-hole stuff but like I don't buy personally I know some people are different but I don't like going to oh six oh three unless I need to on a board like this you'd be using much better off using a 805 even 1206 s but oh wait oh five is generally the go but I know a lot of people is just like their go-to thing is the is the Oh 603 and well okay but on a board like this I would have used larger parts here's something that I noticed on your layout just then um your input cap is all the way over here you've got your power coming in like this going off to your input cap and then tapping off down here to your input that's not what your import cap is for your input cap needs to be close to your input pin and not just branching off like this you don't want to go in over to here and then coming back if you had it over here for legitimate for space reasons or whatever that's fine but then have this trace coming off here and going back to the pin like that but as I said you should have a dart closer otherwise you've just got the inductor in series and that's not that great and it's going to work in this particular case but you know little traps like that could ruin your day later on down the track when you get something more advanced the other thing with this board geez I don't know if I can get in there and measure it but your your via holes there are absolutely tiny what are they like no point four millimeters tops not point three something like that really don't need your RV is that small because you I am may may pay a penalty in terms of manufacturing costs because you might have to go to another manufacturing process to get the smaller holes and to it makes them not easy to like solder wires and hack and mod and things like that and the other thing is the board well I do like the layout which I'll talk about in a sec but stuff yeah it is physically very large so you would have paid a lot you know much and a lot extra for a board that big it could have been shrunk down and made small but maybe there's a reason physical reason to make it that big in which case that's fine but yeah otherwise I would have tried to get the size down on that now as I said your layouts actually quite neat I you know the traces are reasonably short to the point I like I don't know why you chose the locations you did but okay that's part of layout you choose your locations for your parts first and then you route everything and all of your traces oh quite nicely your flow around like this around into there there's just some short ones I mean you've got multiple directions on here but you've got to do that on double sided layout you've got your flood fill plane all over I don't necessarily see any veer stitching like joining these ones together so like you know it's sneaking through here like this it once again it's not going to matter on just a timer thing like this there's no high current staff there's no you know high frequency stuff or anything like that it's going to work fine but on generally speaking yeah you would have added you know V is in here to you know stitch these and keep the ground planes short rather than create huge loops like going all the way around here like this and coming back like that you would you know how stitching join in both sides but as I said it's not going to matter on a board like this but otherwise I look for a first design a first layout and he's excellent well done as for some of your other component varies like 8.06 k you've obviously used the 96 range there there's no need have such our precision in a simple base resistor like that you know so you use like e 12 like an 8 K to something like that would have been fine and your crystals are correct like this with your tracers coming in and kept short and then your caps going down to ground no worries and then for your microchip MCP 7940 real time clock chip I don't know why you've got a diode in series with the battery here you really don't need that the coin cell holders like if you put them in backwards they're going to be okay you don't need the 1k in series or the diet there but can see what you've tried to do in actually protecting the battery putting in but generally you just you don't really need those you can hook your battery straight on to there no worries the reason you can do that is because the internal resistance of the coin cell is actually quite high and you know it can't deliver like a you know a huge amount of our current to damage anything even if you were able to shove it in the the holder back to front its you're generally not going to damage out these types of chips and as for your various switches here I'm not sure where the switcher they on there are yeah up down menu okay all that sort of jazz yeah you don't need these I don't know why you've got the 1k protection resistors in here and you're probably Eisley why you've done the RC debounce here but generally you shouldn't need to do the RC debounce so pretty much all those components will be redundant and as for the pull-up resistor well we can just use the pull up resistor inside the chip no worries and for your relays excellent you've got your our back EMF protection diodes nice so yep for a first star design that is a bloody Ripper good on you Lee sir David Jones thank you very much indeed our person and no one from parts unknown I just killed the stamp I don't know what on earth it is a chocolate bar calculator a bit in shock you later what that's gold Thank You Nick spot of this Chocula at the boot sale without you if anyone would mind lifting the skirt on this old four banger like to know the source of its unique aroma yeah it does have an aroma of kind of cross between plastic and chocolate is all I can say mm-hmm palm in Prague thank you very much Nick it's a chocolate calculator Wow point over here one for oh I heard that creak that wasn't good was it anyway um it works it's fake solar cell there's actually a battery in there hey well it could be dual power but like yeah hmm weird it's crooked Oh all right get in and yeah there's our battery and uh huh looks like a real solar cell is actually hooked up but yeah we'll just cut the membrane keypad that's it and do we have this is weird Oh oh no right it's just a like it's gonna be a chip on board on the back of there hmm yeah well yep that's all she wrote hmm well you know chip on board and a membrane keypad whoop did you know I was gonna guess that the chocolate smell of this thing actually maybe because they bundled this with some chocolate in the same packet and it's like seeped into the plastic or whatnot but I googled it and apparently they actually sold this as a chocolate scented and shaped calculator so like they've actually may have infused it with a chocolate smell like why do these things exist what is like wrong with this planet like I I don't maybe someone wants it then you can get me and oh you can get fake dog poo and farting novelty gnomes and spanker meters and oh geez I don't want my German viewers and thank you very much Alex hack Hawk Hou CK from which part of jou Rothenberg having bitten a rothenburg so let's check out see what's in here we got a postcard from one of your latest videos seriously yes the the problem with the the stupid binding posts on all these looks like it's plagued all of these damn electronic modes awesome thank you very much ah beautiful there you go binding post to banana plug attachment beautiful now you've seen this BK position electronic load before and the annoying binding posts on it yeah they're great if you've got the huge lugs to put on there but if you just wanna plug some banana plugs in like they got no hole in there on the end to plug the banana plugs in they've got no hole in the side of the thread so that you can put your wire through and then screw it on no it's just got the stupid lugs so thank you very much Alex umm I think somebody else was going to send me one of these too but they never actually got around with it and it's just a simple board which goes over the terminals there we go look at that they've taken off some of the code in there just to get some extra current handling capability not that it's going to make a huge amount of difference but that is very very nice a very nice solid insulated binding to that banana plugs and it just goes over there like that beautiful it makes contact on the top side and the bottom side of course fantastic so that is an absolute winner and I'm going to leave that permanently connected because I'll probably use at 95% of the time instead of the binding posts and they've got the banana plugs coming out the right way she want the cables coming out this way instead of if they were coming out this way then it would be over the buttons if you came ahead and coming out the top added get in the way of that you could have them coming out the front I guess but then they did get in one way of turning these so that's ideal perfect unfortunately it's not the same for the Rye goal one which has the same issue with these stupid things anyway I should be able to fix that by just drilling another hole in the side there and scraping off some of the solder mask there and on the bottom and that'll work a treat so yeah what do they do like copy each others like crap design binding posts are they get it another cyclist a from Germany I'm from person Unknowing thank you very much person unknown it's chopped the notes certainly knew what it's a switch why do we have a PCB mount switch hi Dave I've had this for some years but never got around to sending in one of your videos you mentioned you broke the power switch of your eye Goldie's are 1052 I did the same or changing the fairnie mine oh thank you very much I tracked down the supplier in China well done and got a few replacement switches so have one awesome thank you very much yes I did break my um busted my my goal to here original Roy go diaz 1052 ii that's at home now so i won't be able to show you that that's like Sagan's oscilloscope he plays with that and great thanks replacements which we don't know drugs because well yeah we do have pretty strict customs here of Lakeway muck around arbiter did no drugs only an electronic USB chip to the value of 0.1 cents thank you very much from somebody from Laos in no way I don't want my Norwegian viewers how's it hanging in Norway Oh grid paper nice we've got a tiny look in the microscope okay we've got a tiny little board thank you very much still person on no one with beautiful penmanship good bad yeah fantastic like it's not you know it like I just like it it's not your classic penmanship but it's almost it's beautiful they're all the correct excellent um unfortunately stops decoding an mpeg-4 world's smallest TV dongle from sanborns dot IT Italian hmm okay we'll have a quick squeeze microscope so there you go the world's smallest TV dab FM receiver that plugs into the USB no it doesn't but it used to have a USB plug on it I think um but yeah it's tiny just antenna connector on input and yeah let's check it out I'll get the macro lens and there's the top side it looks like we've just got mostly regulator stuff you can tell just by the bypass caps and the typical five pins suck 23 so to do the business and why don't we got a couple of chippies on the bottom that's it Jesus not much doing is there and that puppy there is a real tech RTL 28 32 and that's just a USB input DV receiver it's like all the magic smokers in one chip and the other one right next to the antenna dead giveaway is the RF tuner it's an Elan exert a 4000 and apparently are these were the Ducks guts in the SDR community the software-defined radio community apparently this combination of chipsets was apparently highly regarded but ilanics uh apparently folded and you can't get the e 4000 chipset anymore so yeah this is an old older design but apparently I'm a lot of people were use these things for software-defined radio stuff cool as for heat building up inside the rubber I'm not sure what the case in it was but the chipsets wouldn't take much at all I mean these are Belinda these are linear regulators on here but like you know 79 millionaires at 1.5 volts for the tuna I don't know the real tech chipset PDF doesn't seem to be easy to come by probably under little bloody NDA or some crap like that but you know I don't think it would have consumed a huge amount so I don't think that would have been an issue thank you very much Steve Fazzio or is it fuzzy I think it's fuzzy Oh I'm from Geneva in New York USA once again I double my New York viewers is there anyone else in Geneva I've never heard of Geneva New York I've been to Geneva Switzerland been there but I haven't been to Geneva New York that I'm aware of anyway tissue or we have aa nice look at that beautiful handcrafted so I'm it's a it's a solid soda dispenser wheel fantastic there you go scan me thank you very much Fez who's a youngster and works on Nardo restoring scopes among other things these are some scope of various size scope C's favorite is the 78 34 awesome analog storage fancy-pantsy um and design this little I won't built this the handcrafted little um soda dispenser perfect I've only got the one here and I've got multiple rolls of solder so that one's going straight to the pool room thank you very much it's gonna work a treat thank you very much Steve Kepler from Leo Indiana yes it's a Yankee fest so I'm just picking these randomly off that hope it's not fragile right is there anyone from leo right circuit classics a stepped tone generator sweet it's got to be a kid we have note we have a blink board and nice oh it's the old forest memes circuits bought back to low F um boy um I didn't know it was Steve Kepler of its it's star Simpson um who sells these on that crowd supply so I'm not sure if Steve is related in some way to that but uh or whether or not he just randomly sent me a kid anyway um they bought back the first memens there's like a how to solder in the forest mims I kid if you don't know where head forest on the air power podcast which I'll link in down below fantastic a couple of hours the guy's brilliant so yeah let's check it out yes so this is the forest MEMS the third arm who have had on the amp our fantastic multi our interview I'll have to were linked in and this is basically he's our projects recreated complete with his original hand-drawn our schematics straight out of the book look at that and the various art notes or whatnot from the engineers many notebooks the triple five timer IC circuit page 22 and obviously there's a coin cell battery that goes on the side there and these were done by our star Simpson so I still don't know what Steve has to do with it but anyway thank you very much and it comes with a little the original white hand printed there were hand done forest memes how to get how to solder think and this is the circuit classics there's a whole collection of these which I'll link in down below I think it is cute anyway came with all the parts that'll be a kick that Sagan and I can assemble together brilliant thank you very much Steve thank you Chris Cochran with a K from Northumberland in the UK the old does so have a look I've from the description on this we've had plenty of these so I hope it's something of for Dave it's purple oh I thought I had the open-source Hardware thing it's not it's not the key so retro yeah well let's check it out first here we go yep Sion um we have done that mating the old art people probably haven't seen all my mail banks but we've had Saiyans at least two or three times cool it's the Zion to modern cm so unfortunately so yep we've definitely seen one of these this is the model ICM made in the old dot of course fantastic the Sion organizer too and yes it was one of the first usable PDAs and these things were massively popular I remember I lusted after these but we haven't done a teardown and an extensive comparison I think of the various PDAs back in the day but yet got a processor in there we've just got some SRAM none of that modern DRAM rubbish this would and of course the ER program packs you could just slide the program packs in they just go on these are point one inch headers and they had pre-programmed you know expanded memory and pre-programmed apps and things like that and these were very popular not some not you more probably more so in the industrial market for like you know inventory control and things like that there are really huge and you know I don't know which would it be bigger the consumer or that industrial market but I guess might be the industrial market in the end because these things were built like a brick dolly I know all my Austrian viewers in particular a reinard Grail from ostrich in Austria not Australia let's crack it open once again we've had these on way that sweet that is a a fun Radio Sun we have had one of these before but this hour the summer we've had the vasila radiosonde before but this looks like a complete intact one the one we had before was like like a real old or much older one it was like 20 years old or something in like a it was a cardboard and styrofoam box or something this one's in a proper plastic Jesus weighs a bit because normally like if you don't know what a radiosonde is these things are atmospheric sensors hence all the fancy whiz-bang stuff up the top and they since you know temperature pressure or altitude all that sort of jazz and they transmit it back to the ground they send them up there basically weather balloons and that's how they do it they whack them on the helium balloons and up they go and they drift around and they get the ice in they get the location as well and transmit it all back anyway very cool Wow this is this worthy of like a separate ariane video perhaps cuz they're fascinating stuff they really are yeah oh jesus even got a little poor word on it Wow yeah if you don't see this in the mailbag it's probably because I thought it was to interest you know I decided to a separate teardown video on it I got the note with it this one actually fell into Reinhard's backyard with a note attached to it saying it belonged to a weather balloon and he should be so kind as to dispose of it so instead of disposing of it decided to send it straight to us fully intact awesome yet these things litter the planet they just you know they send up thousands of these radio songs probably every day um and to get you know weather data and stuff like that so okay fantastic I love it fella knew his backyard what are the odds have fallen into a well I've got like almost four million subscribers I may be alright can anyone calculate the odds how many go up per day versus the square area versus like number of viewers thank you very much Reinhold who is lucky enough to have one of these land in his backyard directly knew his garden hanging from a parachute and I've done that one before but it was an older model this is a newer model um which has the GPS antenna the transmitter all the sensors and things like that but I'm going to save that for not only secretary on video but I'm thinking it might be an Eevee discover video if I can get the right contacts I might be able to do some interesting stuff at this but yeah as somebody on Twitter said they actually work for a vey Vassallo face solar I don't know I'm and how he pronounced it and they manufacture like that without they said thousands of these are released per day and they are a one-shot deal so I'm gonna leave that as a tease sorry next and also somebody in Twitter actually converted their car into a tracking vehicle I believe he's from uh South Australia and actually our tracks down these you can actually get modeled in software to predict where these things are going to land and then you can go and hunt them down it's a bit of a game and some people out there go and hunt these things down and have a big trophy wall of all their radio sun's brilliant and you may know what this is are from Zintan e rah thank you very much I've done a video with a video you know it's a video review of the Zinta near our backpack light and they they actually saw that ICO Gala is the company and they said that sin they said they liked the video and they appreciated the feedback and all that sort of stuff and they said that they would send me some accessories for it so thank you very much umm Egyptian stuff cool I'm really into Egyptian stuff [Music] and yeah these are like little attachment things which you can put on it so you can put it on your backpack and and whatnot and they've sent me another battery pack tiny little battery pack oh isn't it cute anyway yeah can't do a teardown it's all altra sonically welded or whatnot but assembled in China US patents pending how can you pack like what a design pattern for you know like how how can you patent a just a battery pack it has to be a design pattern in terms of the look and feel kind of thing so yeah I think we might have a couple of more PCBs this one's from person unknown so let's just oh I probably shouldn't have done that because it has like a no don't we have a piece of EE it is a smart supply oh wow okay cool it's a there you go it's probably a variation of the micro supply somehow um - 18 650 s neat zero to 20 volts 0 to 1 M I'm sorry for ripping those oh that's a real pain in the didn't it jeez electronics engineering student from Belgium thank you very much Thomas even though it wasn't on me yeah he stumbled across my micro supply project and you he wanted to make one I only find out after 14 episodes that you didn't finish it yes sorry various reasons for it we are working on it again I'm actually from completely from scratch ah it's not based on this LT 3080 design anymore um and so it's the spot supply that's neat glad it worked out for you I got quite a lot of people actually built their own variants based on the well my last micro supplies schematic based on the LT 3080 cool ice what hi I'm Thomas an electronics engineering student from Belgium hi I'm Dave and I'm a for tearing your note with my big-ass knife anyway um he stumbled across a mercury supply project first time I saw I knew he wanted to make it after 14 episodes we'd never finished yes we didn't finish but having said that David do and I are now working on the micro supply again it's going to it's not carrying on from where we had before but trust us we are working on it big time so hopefully um we will come out with that and videos will be post there's a talk I've done there's a section on the EEV blog forum where I've shown like a custom LCD which we're going to do for it and stuff like that and everyone's discussing it and things like that but apart from that no other details sorry anyway specifications similar 0 to 20 volt 0 to 1 air power from 2 protected 18 650 lithium cells and it looks something like that isn't that neat I can't remember what my interface look like it was very similar that wasn't it setting out and put it into a funky little case and isn't that cozy there you go so I'll link it in down below where is it we have a website somewhere get up there we go github Thomas vdd smart supplied fully fledged open-source hardware logo excellent hasn't got my letters on there though so that looks pretty jazzy doesn't it I like it cool bananas there you go a lot of people have done micro supply type variants of the project and I totally encourage it it's great to see and yes lots of people on the forum who've you know done that sort of stuff I like how it's almost all through-hole except for that puppy up there but anyway those looks like a nice layout Jezzie wow there's inside the finished product and yeah we've got they're using the back panel as the heat sink in time-honored tradition and it looks like it uses the LT 30 80 still so there you go so world on Thomas that's an excellent implementation LinkedIn down below it's all open source e hi to all my Finnish viewers this one's from Julius will will you go from Espoo Espoo in finland there you go at seven squares I believe this one is a PCB feels like a PCB it's always it did give away hi Dave this is mystery PCB can you guess what it does and what its electrical function is thank Julius will hoe from Finland the answer is this in this second envelope ah there's a second author life no no can I guess the circuit function ah jeez it's got to it's like it there's no the only traces on there are till the hand did you focus the only traces on there are those two big fat ones that you can hear you can see that there there's two big fat ones so it's some some sort of well it's high current so I like and everything else is like mechanical type interfaces so it's like I would say it's from some like maybe a little robot car or something like that it's probably got like some high current motor drive or something it's kind of like a base or it could be like for a quadcopter or some other like you know some other base that mounts motor II type things onto it would be would be my guess gotta go to that web address to see if I'm right ah hang on I just went to check and it's for a slot car it's actually the bottom chassis of a slot car with the motor connection and stuff like that like a homemade slot car so yeah I was bang on it hooks up to the motors and and it's the mounting like I said it was a basis kind of thing and motors hooked up and that's exactly what it was I made sloka cool see wasn't that hard mystery PCB nailed it hang on that was easy [Music]

Channel: EEVblog

Views: 107,280

Rating: 4.8772306 out of 5

Keywords: eevblog, video, radiosonde tracking, choculator, Arduino Inventors Guide, no starch press, Forrest Mimms Circuit Classics, star simpson

Id: WvaGXF-prz8

Length: 42min 3sec (2523 seconds)

Published: Sun Oct 29 2017