MASSIVE thumbs up for this. Super useful for someone starting to make a small business if their own PCB designs. I spent forwver testing my last barch!!
I just got one of these and it works very well, for example I'm using it to monitor the current consumption of a bluetooth low energy device (with a scope) - the uCurrent has plenty of bandwidth so I can clearly see the radio & cpu activity in realtime. Definitely a great piece of kit (and not easy to find anything else similar) - I recommend it.
redtails I'd say it's cheap insurance against someone reproducing the design and Dave geting lumped with the support costs. He can say I haven't produced a black version, what's the serial number on it? Nope, not one of mine, ask the person that sold you the board.
Maybe this was covered in an earlier segment but if you're testing the boards with an external power source, how are the components related to the battery holder for the final product tested? In other words how do you ensure than when the end user inserts the battery it's going to work?
You bring out a good point here. However, you did pseudo-automate your testing with the test units you developed. Eliminating manual labor and still maintaining quality is the key. I always learn a lot from your videos. Keep up the good work!
I bet you could save even more time by implementing the testing modules in to one board too. But this is the part i didn't get, dunno if because i wasn't paying attention or because you didn't mention it: the testers, will they use the same testing equipment you used or use the ones they have in the factory??
Not sure if you have thought of this but if you had specific test blocks for each Current Source then you could add little angle tabs on the underside that would push the switches into the correct position for each test block. Also saw you putting the multimeter against some of them you could even put a volt-meter that only lights up if they fail the test.
Just a question, why did you opt for inexpensive open faced slide switches vs a good sealed 3 position toggle switch? or even a 3 position rocker switch? That gap in the slider you could throw a shoe in there.....I can almost see a sign on that slide switch that says "All dust and debris welcome anytime". I'm just wondering, having heard you say over and over about "crap" parts on other manufactured boards....
At the time I started as a tech in manufacturing much of the manufacturing was in-house. Then gradually more and more was outsourced. The problem, IMO, incoming testing and inspection. Most testing is static because it's fast, cheap and usually sufficient. But the more pricey dynamic testing will revel issues that only show under actual usage conditions. Example, an LCR meter will not show how a transformer will run under actual powered conditions with varying line input and loads. A bad transformer will be no different than a good one on such a tester. As one interviewer told me, I think he was the owner of the company, you could spend a life with magnetics and still not understand it fully.
Dave, I'll be very honest, I'd use a MUX/DEMUX combo and a single test jig. Fast bed of nails and the hardest part would be making sure the traces were all equal length or trim resistors for calibration.
+Ciro Santilli I had to make 20 sandwiches for a family picnic thing a while back, and I actually said "if I could only for-loop this", and then i realized I probably need a vacation.
Your brain can process things faster than you think (not much to process here though, just entertainment),so you could just play it at a higher speed (y)
You still need a tool to convert from current to voltage, with these pcb, I believe that you can get more precise readings compared to measuring the current through a shunt resistor with a differential probe.
I'd like to hear a review of flying probe testing, it seems like it could be good, but not sure if it would be able to do all the measurements you want, or how much it costs. Great video, I found it useful and interesting. Clever testing ideas.
I know this is a year old, but two ideas for future runs: 1. Maybe combine the two packing steps for speed, there might be time wasted putting half-packed boards in a box and picking them up again. Maybe a more padded envelope could even eliminate the inner bubblewrap. 2. Are you sure there isn't room to feed another 5 test lines from each side of the panel to the test connector, given the inherent resilience of current signals. Even with your current connector you could have 10 pairs of go/nogo LEDs on the power pack (sharing the precision references, but not the comparators), then only the test source or a single leed needs moving around in each pass.
from my personal experiences pogo pins seam to be finnicky and break. please leave some kind of connector on the board or a regular connection test jig. either way it will still be faster than testing any Texas instruments product. take the ti hurcules board for example. it takes 10-15 minutes each board to test! and I have had to test about 300-500 the time I worked at PTI in Plano Texas.
you can buy stylet probes on dx.com pretty cheap probably alibaba or aliexpress too. You could probably multiplex the testing. Of course with a pogo pin jig you don't get the same visual inspection aspect of it.
You could have the assembler use a torque wrench to fasten the nuts. Assuming they were using a ratchet wrench initially, that won't increase time but they are pricier however.
Cool, but I think it would have better to have a single board with all 3 current sources included, and a small contact/connector to select the range. Contacts perhaps hidden in the gold writing :) (edit: 4 letters, could even maybe power the board from there, and while we at it, an automatic 'cutter' for passing boards \o/)
As the posts and large shunt resistor appear to be more likely problem points, will closer inspection of those items become part of the testing process?
Hi Dave, if you were manufacturing 10,000's of boards would you consider using Flying Probe testers, No fixture costs! Although your assembler may not own a Flying Prober
Yes, that's another option. A flying probe tester can be a bottleneck though, as they might only have one in the factory. With jigs you can make as many as you want and have as many people as you want working and testing in parallel.
What's worrying about soldering and connector torque issues like these is that it could fail randomly depending on the pressure you put on the board. Also did you consider putting a little buzzer on the test board so that you get some audible feedback as well?
If there is an issue with the torque, then he could tell that to his assembler. Or he tightens those nuts before putting the individual uCurrents into their individual housings. But doing the initial testing as development engineer and customer of the electronic assembler also has the reason to find systemic weak points. If there is one, he can tell his assemblers to look for. If their isn't: Feel confident that it will work. Here: Two boards out of fifty having each a simple fault - that sounds fine to me.
Dave is lucky with this simple design. I will need to think how I will test my product but I guess I will sell way less on my upcoming kickstarter campaign so there will be less product to test :). Still impressive you can get under 20 seconds for testing this ucurrent boards.
RandomVideos Thanks. Is now at 36% after the first 6 days but it slowed down quite bad in the last two so not sure how it will work. Is not really a consumer product and I do not have Dave's crowd :) not even close.
RandomVideos I'm sure he is quite busy to bother with my Solar BMS and he probably dose not even know me. Then is me I just do not like asking for help. It will probably not be that valuable also. Martin Lorton made a video about me it has over 5000 views already but since is not his product people will not show much interest some of them subscribed to my channel but probably not more than one supported the project. I did opened some threads on EEVBlog forum and I think there where at least one or two that showed an interest for this project. There are not that many that use lithium batteries and need a BMS and also not that many that want to learn microcontroller programming and electronic design from me. I'm not an entertaining guy my videos are probably boring to most. Thanks for your interest and suggestions.
What happens to the traces that run in to the corners of the boards? Do they get finished off in one manner or another so they don't pose an electrical threat?
You could use your uArm to do the testing ;) I would totally waste time trying to set that up: though of course, I do have the time to waste! Another good vid - thanks again!
Another interesting video Dave. I find it strange that just one component on one board didn't reflow. Is that common is mass manufacturing? If so what is it attributed to? Not enough solder paste? Dirty parts?
Like he said the thermal mass on that connection was higher due to the large trace and relatively large device, so if your temp is just a fraction too low that will be the first connection to have issues.
MeakerSE No I get that. What I mean was, why would that one part, on that one board, on that one panel have that problem and not the rest? Was the reflow oven temp not set right or was there not enough solder paste or what? And from a manufacturing point of view, how often does that happen? BTW Thanks for the reply.
TheInsanityUnleashed That connection should have a thermal relief. There might be a multitude of reasons behind any soldering defect. One of them being reflow oven temp, like you said. How and why it occurred at that one instance, there might be several different variables in play: - If heat is transferred to the PCB using air in the oven, then there will be natural variation in the temperature of the air. - The distance between panels inside the oven. Every panel absorbs a certain amount of heat energy and if the panels are close to eachothers, the temperature might variate more than the oven is capable of keeping stable. Overshoot/undershoot might happen, as in any other similar system. - Oven settings might have been correct, but the temperature had not reached correct temperature yet. Note: different parts of the panel reach the reflow-zone at different times --> In some extreme cases (thermal imbalance), the result might differ depending on which way the board was inserted into the oven. - Variations in the PCB: copper thickness, plating thickness etc. - Variations in the metal parts of the component. Note: heat can also transfer through the component itself. Depending on the component of course. - Variations in the paste volume and content. That one case was a cold joint, so unlikely to be caused by pasting. All in all, it all boils down to the PCB design. The design dictates on how much there is tolerance for variation at the assembly. Defects are usually measured in PPM in the industry. That is, defect per Million opportunities. So if you have 10PPM, then you are getting 10 defects per Million solder joints. (Million solder joints might sound like a lot, but you get there quite fast. Think about a BGA with 400 contacts. Or 1400, for that matter.)
Dave, what are you going to do with all the boards that fail the test? if you got a 4% fault rate, at 18.000 boards, thats 720 boards that you need to investigate why they don't work. Or do you scrap them and just over-produce?
EGL24Xx That is correct. I have heard both forms on American news channels (eighteen hundred as well as one thousand eight hundred). One more question: Dave mentions "And he will does a trial run on ..." in the comment of this video. Is this British/Aussie grammar? I though it should be "he will do". Of course it is not important at all. We are more interested on Techniques, not English grammar or typos.
50 units with two failures. That can't be good, can it? What is the typical industry yield for a device of that complexity? Will the assembler be expected to fix the bad boards or will they send them out to you?
hello dave Ive been watching your production run so I came across with a question Was it worth on buying a 3d printer for making the case for the ucurrent instead of ordering a custom made or a close size case box?
+Alex Verias I got one in the mail, I really don't think it's a custom box, it's just a standard size one (and he made the PCB to fit it), the box actually comes with a lid which is useless because the PCB itself is the lid. 3D printing would be very slow (and hence expensive).
I test all my parts with a custom connector and put led lights the led don’t work I order more or put a connector that cancels that part and move to the next what are they for the boards you sell?
here's and idea: you know pretty much everything you need to know so why not build a robotic tester that you can just plug in and let it work?? I mean that's what id do if I had your knowledge.. :)
Im sure dave does one kickstarted eventually later.. Or i think adafruit sells these as well. Not the gold version of course but, atleast you get uCurrent
Reuel T you would have to insulate the entire input side trace as well as any components that connect to the input to eliminate any risk of electric shock due to user idiocy. Besides, some "fools" might also lick live wires, the assumption is that anybody using a device like this is going to be at the very least semi competant.
Reuel T 1) This is hardly a consumer product 2) Very unlikely that anyone will be measuring current of dangerous voltages with this (you know what it's intended for, right?) 3) Gold plated bananas are great for this; it's all about super low resistance; they accept bare wires plus they work with lots of standard probes 4) Putting words in CAPS doesn't make you look any smarter
The source of the OSHW is important with respect to any support or replacement provided. If the Chinese manufacturer wants to ride on eevblog's hardware quality reputation, they'll copy all PCB markings. Then, when their junk has problems, the owner might expect support or replacement from eevblog. No holographic sticker? So sorry.
I find the subject matter interesting, my complaint is I have to process the audio to remove all the highs from the narrator's voice, it's so high pitched for a man. Here's a funny thing to do, in the youtube settings, change the playback speed to 0.5 (located in the lower right by clicking on the little gear icon), makes the narrator sound like a drunk old lady............Oh, narrator, try saying some positive things sometime...did a lot of complaining about "all" the work you have to do for testing, and then cutting the boards apart and packaging......do a video of you complaining about the money you put in your pocket from the sales of those boards. :/ ..... And as MichaelKingsfordGray commented about those failures, I agree, seems rather high at 4%, and they are due to sloppy assembly, which I didn't hear the narrator say anything to the effect of "look at that crap" or "those dickheads", I suspect he was trying to go lightly on the one who is producing "his" boards....but really!? Just my observations and opinion, if that matters any... ...Any way, keep busting things open!...I like seeing electronic entrails... :)
Peter Lloyd no they actually dont sount like that its just him. he had his tightie whites to bunched up when his was young. or was a dailly victim of an atomic wedgie. or his nut sack hasnt fully fallen.
MASSIVE thumbs up for this. Super useful for someone starting to make a small business if their own PCB designs. I spent forwver testing my last barch!!
I just got one of these and it works very well, for example I'm using it to monitor the current consumption of a bluetooth low energy device (with a scope) - the uCurrent has plenty of bandwidth so I can clearly see the radio & cpu activity in realtime. Definitely a great piece of kit (and not easy to find anything else similar) - I recommend it.
this channel has changed everything for me.
2:46 the glittery stickers with the "EEVBlog" and presumably the serial number on it, are fantastic!
redtails I'd say it's cheap insurance against someone reproducing the design and Dave geting lumped with the support costs. He can say I haven't produced a black version, what's the serial number on it? Nope, not one of mine, ask the person that sold you the board.
Maybe this was covered in an earlier segment but if you're testing the boards with an external power source, how are the components related to the battery holder for the final product tested? In other words how do you ensure than when the end user inserts the battery it's going to work?
I always love when it start with : "Just a very quick video ..."
... and the video ends up being almost 15 minutes long XD
Ryan Willis Whatchya talkin' bout? :P 15 minutes - that's one short video. It's over right before it starts to be interesting. :P
"Just a quick video" *15 minutes long*, good thing you're interesting lol
You bring out a good point here. However, you did pseudo-automate your testing with the test units you developed. Eliminating manual labor and still maintaining quality is the key. I always learn a lot from your videos. Keep up the good work!
I bet you could save even more time by implementing the testing modules in to one board too.
But this is the part i didn't get, dunno if because i wasn't paying attention or because you didn't mention it: the testers, will they use the same testing equipment you used or use the ones they have in the factory??
I think Dave will ship his jigs, as he made the jigs specifically for testing his specific board :)
Well done video. :-)
Is the price worth it? You could always fire up a 10 hour audiobook and go to town :)
Love the high speed production music! Thanks Dave. ;)
Holy heck! Less than 20 seconds to test each board's 3 settings for 50 boards, not even 6 seconds per setting per board?! 0.0
A beep on success would have been more convenient maybe ?
The face and hand logo turned out nicely!
Not sure if you have thought of this but if you had specific test blocks for each Current Source then you could add little angle tabs on the underside that would push the switches into the correct position for each test block. Also saw you putting the multimeter against some of them you could even put a volt-meter that only lights up if they fail the test.
Just a question, why did you opt for inexpensive open faced slide switches vs a good sealed 3 position toggle switch? or even a 3 position rocker switch? That gap in the slider you could throw a shoe in there.....I can almost see a sign on that slide switch that says "All dust and debris welcome anytime".
I'm just wondering, having heard you say over and over about "crap" parts on other manufactured boards....
JFM, GOT IT! Really though, bringing out the outputs and power to one card edge connector for testing/calibration your product.
At the time I started as a tech in manufacturing much of the manufacturing was in-house. Then gradually more and more was outsourced. The problem, IMO, incoming testing and inspection. Most testing is static because it's fast, cheap and usually sufficient. But the more pricey dynamic testing will revel issues that only show under actual usage conditions.
Example, an LCR meter will not show how a transformer will run under actual powered conditions with varying line input and loads. A bad transformer will be no different than a good one on such a tester.
As one interviewer told me, I think he was the owner of the company, you could spend a life with magnetics and still not understand it fully.
Dave, I'll be very honest, I'd use a MUX/DEMUX combo and a single test jig. Fast bed of nails and the hardest part would be making sure the traces were all equal length or trim resistors for calibration.
Looking nice with that new ESD matting!
Software engineer thinking: you can't use a for loop?!?! :-)
+Ciro Santilli
Hahaha...
1 FOR A=1 TO 1800
2 TEST BOARD
3 NEXT
READY.
RUN
+Ciro Santilli I had to make 20 sandwiches for a family picnic thing a while back, and I actually said "if I could only for-loop this", and then i realized I probably need a vacation.
He's already using a for loop.
What he needs is parallel computing ;-)
Your brain can process things faster than you think (not much to process here though, just entertainment),so you could just play it at a higher speed (y)
I like the Flux Capacitor diagram you have screen printed on the back of those.
What do these boards do, anyway?
Measure current and outputs a voltage that can be analyzed with e.g. an ADC or oscilloscope
Well why would they need to do that when you can just measure current with an o-scope directly already?
You still need a tool to convert from current to voltage, with these pcb, I believe that you can get more precise readings compared to measuring the current through a shunt resistor with a differential probe.
I'd like to hear a review of flying probe testing, it seems like it could be good, but not sure if it would be able to do all the measurements you want, or how much it costs. Great video, I found it useful and interesting. Clever testing ideas.
I know this is a year old, but two ideas for future runs:
1. Maybe combine the two packing steps for speed, there might be time wasted putting half-packed boards in a box and picking them up again. Maybe a more padded envelope could even eliminate the inner bubblewrap.
2. Are you sure there isn't room to feed another 5 test lines from each side of the panel to the test connector, given the inherent resilience of current signals. Even with your current connector you could have 10 pairs of go/nogo LEDs on the power pack (sharing the precision references, but not the comparators), then only the test source or a single leed needs moving around in each pass.
John Doe I
Where are the boxes the µCurrent PCB's are supposed to mount on Dave?
"Really quick" = still slow when you get into the bigger numbers like that!
from my personal experiences pogo pins seam to be finnicky and break. please leave some kind of connector on the board or a regular connection test jig. either way it will still be faster than testing any Texas instruments product. take the ti hurcules board for example. it takes 10-15 minutes each board to test! and I have had to test about 300-500 the time I worked at PTI in Plano Texas.
Who is hitting dislike for this video? I do not understand.
you can buy stylet probes on dx.com pretty cheap probably alibaba or aliexpress too. You could probably multiplex the testing. Of course with a pogo pin jig you don't get the same visual inspection aspect of it.
You could have the assembler use a torque wrench to fasten the nuts. Assuming they were using a ratchet wrench initially, that won't increase time but they are pricier however.
have you considered using a mini mill for board production? They work well for testing a design.
You could do tri-state tester to speed it up. Make your current show with logic to output those there amperages in one second.
eat Video Dave, your explanation is great as usual :-)
Cool, but I think it would have better to have a single board with all 3 current sources included, and a small contact/connector to select the range. Contacts perhaps hidden in the gold writing :) (edit: 4 letters, could even maybe power the board from there, and while we at it, an automatic 'cutter' for passing boards \o/)
As the posts and large shunt resistor appear to be more likely problem points, will closer inspection of those items become part of the testing process?
Hi Dave, if you were manufacturing 10,000's of boards would you consider using Flying Probe testers, No fixture costs!
Although your assembler may not own a Flying Prober
Yes, that's another option. A flying probe tester can be a bottleneck though, as they might only have one in the factory. With jigs you can make as many as you want and have as many people as you want working and testing in parallel.
you need to make a tester plate then. that way you can cut down on the yapping as well.
What does testing documentation look like? Is it written as just a series of steps? Would pictures of the testing setup typically be included?
good to see the good old flux capacitor
Thank you Dave, great vid...( of course I havent finished yet)
Have any bad units slipped past testing (yet)? What percent of them fail testing? Do you test the test jig at all?
this may prove very helpful for me in my new job
Which will it be? :)
Carlos Pits goat milker maybe?
What's worrying about soldering and connector torque issues like these is that it could fail randomly depending on the pressure you put on the board.
Also did you consider putting a little buzzer on the test board so that you get some audible feedback as well?
Buzzers are really really annoying!
EEVblog
Which is why they're perfect for the failure indicators, and horrible for the pass indicator.
SAI Peregrinus
Unless 95% of the boards are out of spec. But I think the buzzer would be the least of your problems...
If there is an issue with the torque, then he could tell that to his assembler. Or he tightens those nuts before putting the individual uCurrents into their individual housings.
But doing the initial testing as development engineer and customer of the electronic assembler also has the reason to find systemic weak points.
If there is one, he can tell his assemblers to look for. If their isn't: Feel confident that it will work. Here: Two boards out of fifty having each a simple fault - that sounds fine to me.
sarowie You should specify the required torque in Nm (compared to saying "use the force")..
EEVblog can you comment about the costs? How much did they charge you for the testing hour?
More Dave electronics videos! :)
Nice test jig. No plastic boxes?
Dave is lucky with this simple design.
I will need to think how I will test my product but I guess I will sell way less on my upcoming kickstarter campaign so there will be less product to test :).
Still impressive you can get under 20 seconds for testing this ucurrent boards.
Good luck on your campaign
RandomVideos Thanks. Is now at 36% after the first 6 days but it slowed down quite bad in the last two so not sure how it will work. Is not really a consumer product and I do not have Dave's crowd :) not even close.
+electrodacus Why not ask Dave to promote your Solar BMS ?
RandomVideos
I'm sure he is quite busy to bother with my Solar BMS and he probably dose not even know me. Then is me I just do not like asking for help.
It will probably not be that valuable also. Martin Lorton made a video about me it has over 5000 views already but since is not his product people will not show much interest some of them subscribed to my channel but probably not more than one supported the project.
I did opened some threads on EEVBlog forum and I think there where at least one or two that showed an interest for this project.
There are not that many that use lithium batteries and need a BMS and also not that many that want to learn microcontroller programming and electronic design from me.
I'm not an entertaining guy my videos are probably boring to most.
Thanks for your interest and suggestions.
You're welcome.
What happens to the traces that run in to the corners of the boards? Do they get finished off in one manner or another so they don't pose an electrical threat?
You could use your uArm to do the testing ;) I would totally waste time trying to set that up: though of course, I do have the time to waste!
Another good vid - thanks again!
The human arms works quicker!
EEVblog Auch, I know =/
My specialty is over-engineering things in my spare time ;)
Another interesting video Dave. I find it strange that just one component on one board didn't reflow. Is that common is mass manufacturing? If so what is it attributed to? Not enough solder paste? Dirty parts?
Like he said the thermal mass on that connection was higher due to the large trace and relatively large device, so if your temp is just a fraction too low that will be the first connection to have issues.
MeakerSE
No I get that. What I mean was, why would that one part, on that one board, on that one panel have that problem and not the rest? Was the reflow oven temp not set right or was there not enough solder paste or what? And from a manufacturing point of view, how often does that happen? BTW Thanks for the reply.
TheInsanityUnleashed That connection should have a thermal relief.
There might be a multitude of reasons behind any soldering defect. One of them being reflow oven temp, like you said. How and why it occurred at that one instance, there might be several different variables in play:
- If heat is transferred to the PCB using air in the oven, then there will be natural variation in the temperature of the air.
- The distance between panels inside the oven. Every panel absorbs a certain amount of heat energy and if the panels are close to eachothers, the temperature might variate more than the oven is capable of keeping stable. Overshoot/undershoot might happen, as in any other similar system.
- Oven settings might have been correct, but the temperature had not reached correct temperature yet. Note: different parts of the panel reach the reflow-zone at different times --> In some extreme cases (thermal imbalance), the result might differ depending on which way the board was inserted into the oven.
- Variations in the PCB: copper thickness, plating thickness etc.
- Variations in the metal parts of the component. Note: heat can also transfer through the component itself. Depending on the component of course.
- Variations in the paste volume and content. That one case was a cold joint, so unlikely to be caused by pasting.
All in all, it all boils down to the PCB design. The design dictates on how much there is tolerance for variation at the assembly.
Defects are usually measured in PPM in the industry. That is, defect per Million opportunities. So if you have 10PPM, then you are getting 10 defects per Million solder joints. (Million solder joints might sound like a lot, but you get there quite fast. Think about a BGA with 400 contacts. Or 1400, for that matter.)
Dave, what are you going to do with all the boards that fail the test? if you got a 4% fault rate, at 18.000 boards, thats 720 boards that you need to investigate why they don't work. Or do you scrap them and just over-produce?
I believe Dave said eighteen hundred. Not eighteen thousand. I think this is the British/Aussie way to say 1'800
Yes you are correct, haha :) I remembered the number that he said wrong :P
The failure rate should be much lower now that we know that some issues have been identified which can be corrected.
Ali Mirjamali Well, we do say eighteen hundred in the US too
EGL24Xx That is correct. I have heard both forms on American news channels (eighteen hundred as well as one thousand eight hundred). One more question: Dave mentions "And he will does a trial run on ..." in the comment of this video. Is this British/Aussie grammar? I though it should be "he will do". Of course it is not important at all. We are more interested on Techniques, not English grammar or typos.
50 units with two failures. That can't be good, can it? What is the typical industry yield for a device of that complexity? Will the assembler be expected to fix the bad boards or will they send them out to you?
so good thanks
hello dave Ive been watching your production run so I came across with a question
Was it worth on buying a 3d printer for making the case for the ucurrent instead of ordering a custom made or a close size case box?
+Alex Verias I got one in the mail, I really don't think it's a custom box, it's just a standard size one (and he made the PCB to fit it), the box actually comes with a lid which is useless because the PCB itself is the lid. 3D printing would be very slow (and hence expensive).
I test all my parts with a custom connector and put led lights the led don’t work I order more or put a connector that cancels that part and move to the next what are they for the boards you sell?
here's and idea: you know pretty much everything you need to know so why not build a robotic tester that you can just plug in and let it work?? I mean that's what id do if I had your knowledge.. :)
you need to look at locking washers or spring washers.
Given that the nut didn't move when he jabbed it with his fingers, i think it's a locknut?
@ 9:33 What does it say in the background of the sticker? I've not seen a PCB with this type of sticker on before.
VALID GENUINE VALID GENUINE and it repeats.
Awesome.
Hey Dave, I was wondering, how come you didnt use a ground plane on this PCB? Is there a specific reason?
The entire top layer is a ground plane
Where can i find the part ref. of these lovely jack sockets ? Thx.
2:14 Time to skin the cat!
@ 10:50 What is the little link between the terminal and R1/R2? Is that acting as a PCB fuse?
+08Ultrasonic I believe that it is a current shunt resistor.
Not a clue what you are talking about but I loved the video just the same==Now take it apart!
Looks like you need a board as large as the other one and plug it all in at once.
Is it still possible to get one of these for those that didn't get a chance to donate for the kickstarter?
Im sure dave does one kickstarted eventually later.. Or i think adafruit sells these as well. Not the gold version of course but, atleast you get uCurrent
Check out his web shop. www.eevblog.com/shop/
Although that one is a bit different, may not be what you are looking for.
make a tutorial on panelization plz
Who's the lucky winner to get hand-soldered shunt resistor piece?
Hey Dave. Who fabs your PCBs?
He said it in the beginning when he was holding them up....
Tom L That's assembly, not fabrication.
Steven Osborn the boards are from project-pcb.com
ohhh it's a 4 point probe system. Couldn't figure it out from this video :)
That was a good video.
so what is a micro current board?
I'm surprised packing them takes longer than wrapping them in bubble wrap.
15 minute is a quick video?
You must be new here
you look like linus tech tips father lol
9:15 -- Is that a flux capacitor symbol?
well done m8 may i have a micro current board
like these videosssssssssssss..well done
3:23 Great!
Is that a gold plated bolt/nut ?????
Yep, nut and washer gold plated.
Very nice no expense wasted. Nice product
Reuel T you would have to insulate the entire input side trace as well as any components that connect to the input to eliminate any risk of electric shock due to user idiocy. Besides, some "fools" might also lick live wires, the assumption is that anybody using a device like this is going to be at the very least semi competant.
Reuel T Everyone on the internet is suddenly an engineer. Go teach him how is done buddy, let us see your designs.
Reuel T 1) This is hardly a consumer product 2) Very unlikely that anyone will be measuring current of dangerous voltages with this (you know what it's intended for, right?) 3) Gold plated bananas are great for this; it's all about super low resistance; they accept bare wires plus they work with lots of standard probes 4) Putting words in CAPS doesn't make you look any smarter
Who’s the funny looking bloke next to the platypus?
CAN I BY SET OF 10 ON THE PANNEL IS THAT POSABLE PLAESE REPLY THANKS
what is it used for
I would like to think that hobbyking has quality control, but the more i order from them, the less i believe in that.
oooo beauty !!!
He didn't say hi :(
It's funny, what are these things?
Precision sub-miliamp ammeters.
So, only two bad out of 50? I see you use holographic stickers to allow detection of cheap Chinese knock-offs.
It is OSHW so if china want to make them they can
The source of the OSHW is important with respect to any support or replacement provided. If the Chinese manufacturer wants to ride on eevblog's hardware quality reputation, they'll copy all PCB markings. Then, when their junk has problems, the owner might expect support or replacement from eevblog. No holographic sticker? So sorry.
Nice
Can I ask you to help me to create something?
He is the pewdepie of the electricity
beauty :)
hold down the m key while hes talking
👍👍
Man do you talk a lot!! Gets annoying after one is a few mins into the vid. Anyhow..great vid!
Robots.
Yeknow
I find the subject matter interesting, my complaint is I have to process the audio to remove all the highs from the narrator's voice, it's so high pitched for a man. Here's a funny thing to do, in the youtube settings, change the playback speed to 0.5 (located in the lower right by clicking on the little gear icon), makes the narrator sound like a drunk old lady............Oh, narrator, try saying some positive things sometime...did a lot of complaining about "all" the work you have to do for testing, and then cutting the boards apart and packaging......do a video of you complaining about the money you put in your pocket from the sales of those boards. :/ .....
And as MichaelKingsfordGray commented about those failures, I agree, seems rather high at 4%, and they are due to sloppy assembly, which I didn't hear the narrator say anything to the effect of "look at that crap" or "those dickheads", I suspect he was trying to go lightly on the one who is producing "his" boards....but really!?
Just my observations and opinion, if that matters any...
...Any way, keep busting things open!...I like seeing electronic entrails... :)
Complaining a lot? Naa, He's Australian, they all sound like that :P
nope cant do that . google mustve sp.
Peter Lloyd
no they actually dont sount like that its just him. he had his tightie whites to bunched up when his was young. or was a dailly victim of an atomic wedgie. or his nut sack hasnt fully fallen.
Peter Lloyd
actaully they dont all sould like that all. i've had a few friends down there ok. me think they screwed up in the chemistry lab, tho.
you must lead such a shitty life, lol
jesus.