hybridfree/eevblog-posts huggingface dataset:
Can you please make a video about PLL (phase lock loop)? - Page 1
Forum section: electronics / general

author: Tantal
author_rank: Contributor
timestamp: May 25, 2015, 04:56:00 pm
content: I loved the Opamps video. Can you please make one covering PLL (phase lock loop), VCO& stuff?cheers,T.

author: IanB
author_rank: Super Contributor
timestamp: May 25, 2015, 05:06:44 pm
content: To save you waiting, W2AEW did one here:https://youtu.be/SS7z8WsXPMk

author: Thor-Arne
author_rank: Unknown
timestamp: May 25, 2015, 09:53:55 pm
content: I vote for a video onMultiloop PLL Frequency Synthesizer.W2AEW's excellent video describes til basics very well, perhaps more on the limitation of the pll.

author: Votality
author_rank: Contributor
timestamp: May 26, 2015, 11:03:16 pm
content: Quote from: Tantal on May 25, 2015, 04:56:00 pmBill herd also talks about pll basics

author: opty
author_rank: Regular Contributor
timestamp: May 26, 2015, 11:32:16 pm
content: Quote from: Tantal on May 25, 2015, 04:56:00 pmAs mentioned above, have you checked out the w2aew youtube channel?If found it really good, well organized and explained electronics basics.Now, this is purely my opinion; Dave's bragging and conversational style is very entertainingand can be informational/informative as well, but for education w2aew just works better ...Opty

author: Tantal
author_rank: Contributor
timestamp: May 27, 2015, 09:42:50 pm
content: Quote from: opty on May 26, 2015, 11:32:16 pmI like them both. But when my wife watches Greys Anatomy and other crap I also want some entertainment. And then I go and watch Dave

author: Tantal
author_rank: Contributor
timestamp: May 27, 2015, 11:02:05 pm
content: Quote from: Thor-Arne on May 25, 2015, 09:53:55 pmThanks for the link. I also like this video here. Especially the part where he slows down the filter:
Hakko fx951 soldering station - Page 1
Forum section: electronics / general

author: tawfiq
author_rank: Newbie
timestamp: May 25, 2015, 07:46:49 pm
content: Hi everyone,I'm planning to buy a new hakko fx951 soldering station and I was checking different websites for pricing. Please note that the country I am from, this make/model is not available anywhere, so I have to get it from overseas.Now, when I checked different websites, it seems that US amazon offers the lowest price which is around US $235 including a 1.6mm chisel tip. But amazon UK site offers it for £285, which is almost double the US price and on top of that, UK amazon offer is without any tip! The same model also available from one of the singapore supplier at a price range from S$614, which is close to the UK amazon offer. Again, Singapore offer does not include any tip.Why and how US amazon offers it at this price? Is it because they are tax free? Or it can be a fake Chinese copy? Besides, the UK offer mentioned it is Genuine Japanese make.On the other hand, US model will be 120v AC mains and we have 230/240v AC mains here, so if anyone knows insite of this unit whether if it has a 230 volt tap in the transformer and if I can just change the connection in the board and it will be able to take 230v AC or not, please let me know.Another issue is - the tip, the US model and website says they are T15 series and UK/Singapore sites say they are T12, is it different in US models or its a mistake?These are 3 links for referenceUS Amazonhttp://www.amazon.com/Hakko-FX-951-Soldering-Station-T15-D16/dp/B00OBQGLGG/ref=sr_1_2?ie=UTF8&qid=1432563987&sr=8-2&keywords=hakko+951UK Amazonhttp://www.amazon.co.uk/gp/aw/d/B00SRQ53MO?me=&ref=olp_product_detailsSingapore supplierhttp://sg.element14.com/hakko/fx951/soldering-station-digital/dp/9677933?ost=hakko+fx951&categoryId=800000004978Any suggestions/comments would be really helpful and appreciated. Anyone knows the actual price?Thanks.
The best ever power source (AC/DC) - Page 1
Forum section: electronics / general

author: Drazn
author_rank: Newbie
timestamp: May 17, 2015, 08:00:34 pm
content: Episode with switcher is nothing compared to this one. Please, make a video on this one:https://www.youtube.com/watch?t=72&v=skAePZGgpAA

author: Asmyldof
author_rank: Regular Contributor
timestamp: May 21, 2015, 03:45:31 pm
content: Amazing how all his films have a very stationary point with an electrical lead or power strip attached at that one specific corner between identical tiles.He must have superior eye for detail!Sure, sometimes it's the corner of the power strip which magically rotates about that point any time you touch it and other times when he's showing the power socket has no wires it's the lamp, but man, it's some continuity legend, right there!
Poor man's RLC meter: software + PC soundcard - Page 1
Forum section: electronics / general

author: ogden
author_rank: Super Contributor
timestamp: May 13, 2015, 12:11:17 pm
content: Hi!While ago I stumbled on AD articlehttp://www.analog.com/library/analogdialogue/archives/45-11/soundcard.htmlwhich itself was interesting, however author of mentioned software made another onehttp://www.sillanumsoft.org/ZRLC.htmwhich I find even more appealing: software-based RLC meter. Circuit is so simple that it can be breadboarded in virtually no time. Question is: how good such meter is?Hands-on episode which could be as follow-up to #38 of RLC explanation could be interesting. Possibly such device is good enough to bin-sort inductors and capacitors. Who knows - maybe precision is good enough for beginners to actually use such as an instrument.Kind Regards,ogden
EEVBlog #833-What's special about audio opamps (LM833) - Page 1
Forum section: electronics / general

author: Chipguy
author_rank: Unknown
timestamp: May 09, 2015, 11:02:43 pm
content: Ok with #555 and #741 are the two numbers related to ICs pretty much used up.Waiting for #4580 or #5532 to make a video about audio opamps would take some 36 years with 130 blog videos every year.There is the LM833, that was used in Audio in the 90's and the 2000's and is still used today.Suggestion:Take the LM833 as an example and explain the differences between opamps designes for audio and those not so well suited for audio.For example, explain why the offset voltage and offset drift are not that important in most circuits while noise and and nonlinear distortion are.
View my posts - Page 1
Forum section: electronics / general

author: tytower
author_rank: Contributor
timestamp: April 28, 2015, 03:21:01 am
content: Looks like a can't remove an accidental double post either huh?

author: Mr.B
author_rank: Unknown
timestamp: April 28, 2015, 03:35:24 am
content: Click the Remove button top right of your post...

author: tytower
author_rank: Contributor
timestamp: April 28, 2015, 08:43:57 am
content: No it won't let me on the initial post topic . Try it
View my posts - Page 1
Forum section: electronics / general

author: tytower
author_rank: Contributor
timestamp: April 28, 2015, 03:23:31 am
content: I find a button that lets me go to "View My Posts" very handy if you are a user who asks a lot of questions which is what I am . I can find it with a name search but a front page button is by far better"View new answers" is good if it addressed all posts , answered or not. Iit is easy to find posts that need to be edited or attachments put on later.

author: xrunner
author_rank: Super Contributor
timestamp: April 28, 2015, 03:27:05 am
content: Quote from: tytower on April 28, 2015, 03:23:31 amLook in your profile summary.

author: Mr.B
author_rank: Unknown
timestamp: April 28, 2015, 03:28:13 am
content: Profile Summary, Show PostsOOPS, sorry xrunner...

author: tytower
author_rank: Contributor
timestamp: April 28, 2015, 03:30:47 am
content: Yep thats good but could be better on front page
EMC - Page 1
Forum section: electronics / general

author: Tandy
author_rank: Frequent Contributor
timestamp: December 19, 2014, 11:07:43 am
content: Seeing the EMC probes set in EEVblog #694 – Mailbag it would be interesting if you could cover EMC a bit more. Perhaps cover some common errors that novices make when trying to move from a DIY project to producing a product. Perhaps some design tips with some broad principles on how to minimise EMC problems at the design stage such as Clock Termination and using Decoupling Capacitors etc.

author: wemme
author_rank: Regular Contributor
timestamp: April 21, 2015, 11:05:58 pm
content: I also would like to see more EMC topics however this is not a very popular topic, Dave rightly likes to keep on popular topics as at the end of the day generates more income.RegardsBartQuote from: Tandy on December 19, 2014, 11:07:43 am

author: bookaboo
author_rank: Frequent Contributor
timestamp: April 22, 2015, 07:18:35 am
content: I'd love to see this content, it could be some of the most useful and interesting content out there. Raise the bar Dave
Video request: Types of transistors - Page 1
Forum section: electronics / general

author: Dave
author_rank: Super Contributor
timestamp: April 19, 2015, 04:17:58 am
content: It's getting pretty tiresome answering the exact same question day in and day out."What's the difference between a transistor and a MOSFET?"Well, what is the difference between a car and an Audi?So, I hereby request that you make a short video explaining various types of transistors: BJTs, MOSFETs, JFETs and perhaps others (depends on how basic you want to keep it).Let's clear up the confusion about the types of transistors once and for all.

author: c4757p
author_rank: Super Contributor
timestamp: April 19, 2015, 04:26:04 am
content: Yes, and whether each type is current- or voltage-controlled.

author: Whales
author_rank: Super Contributor
timestamp: April 19, 2015, 04:30:15 am
content: Quote from: c4757p on April 19, 2015, 04:26:04 amIt's worth explaining that although voltage and current are dependant, in certain situations it's easier to predict behaviour if thinking in terms of current or voltage. It all depends on your circuit and how you are driving things.

author: timofonic
author_rank: Frequent Contributor
timestamp: April 19, 2015, 08:19:29 pm
content: I have severe problems understanding transistors and those damn formulas. I had issues with Thevenin, now Transistors , transistor curve and Beta stuff drive me crazy

author: alexanderbrevig
author_rank: Frequent Contributor
timestamp: April 19, 2015, 08:44:54 pm
content: This would be awesome! +1 for the suggestion

author: codeboy2k
author_rank: Super Contributor
timestamp: April 19, 2015, 11:39:30 pm
content: Quote from: Whales on April 19, 2015, 04:30:15 am... and so it begins

author: xrunner
author_rank: Super Contributor
timestamp: April 19, 2015, 11:53:11 pm
content: Quote from: Dave on April 19, 2015, 04:17:58 amReally good suggestion. Maybe with two simple circuits that do the same thing using the two different devices.

author: 10101
author_rank: Contributor
timestamp: April 19, 2015, 11:58:44 pm
content: Very good idea for a fundamentals friday !!!i'm yet to understand how in FET's that transductance thingy works and those damned equations ohhh the pain

author: EEVblog
author_rank: Unknown
timestamp: April 20, 2015, 12:01:15 am
content: I agree it's a good topic, the tick is avoiding the rabbit hole!I'll look into it.

author: PeterFW
author_rank: Frequent Contributor
timestamp: April 20, 2015, 12:11:11 am
content: Quote from: EEVblog on April 20, 2015, 12:01:15 amPlase, that would ne awesome!

author: timofonic
author_rank: Frequent Contributor
timestamp: April 20, 2015, 12:18:11 am
content: Quote from: EEVblog on April 20, 2015, 12:01:15 amPlease yes! Could you provide it in a series and show detailed examples running in real hardware and/ir simulator? From basics to different types

author: c4757p
author_rank: Super Contributor
timestamp: April 20, 2015, 01:08:20 am
content: Quote from: codeboy2k on April 19, 2015, 11:39:30 pm...I'm so, so sorry.
Fundamental Friday - reciprocal frequency counter - Page 1
Forum section: electronics / general

author: Chipguy
author_rank: Unknown
timestamp: May 09, 2015, 11:07:46 pm
content: Principle of reciprocal frequency counting.

author: EEVblog
author_rank: Unknown
timestamp: May 09, 2015, 11:22:25 pm
content: I have a vague recollection I've done this somewhere?

author: Chipguy
author_rank: Unknown
timestamp: May 10, 2015, 07:43:11 am
content: Maybe because I suggested that a while ago in a tweet, right after you made the first video about gravity influencing crystal oscillators.It was not the april fool one, but I think in a video from 2014.And yes, you mentioned in a sentence or two that those frequency counters use the input signal as the gate to count their own reference frequency and calculate. But not in detail. That could even be in the april fool video 2015, I'd have to re-watch it.Or maybe I missed that video? Opps....bummer...

author: Rerouter
author_rank: Super Contributor
timestamp: May 10, 2015, 09:32:48 am
content: principle of operation, count the reference oscillator cycles, and gate on external input, this gives you the number of cycles that equate to delay between a cycle on the input, you take that count and recipricate it to get the input frequency,E.g. using a 16mhz reference, and feeding in an input of 48Khz, it would gate on average every 333.3 cycles of the reference, for a purely logic based approach, this may be done using a parallel eeprom to keep the circuit compact,Or in a micro-controller, you can run a timer all the way up to the oscillator frequency on most, but with reciprocal counters, you really want to either use averaging, or keep the reference frequency a fair amount higher than the input if you want the count to remain accurate,e.g. my frequency counter project jumps into reciprocal counting below 200Hz for a 250Khz reference, which gets about 0.2Hz resolution per sample (1 count difference is 0.16hz) but if you play it smart, you can increase your number of averages as the frequency increases, further increasing the resolution for a repetitive signal, allowing all the way down to parts per million from a decent reference frequency, e.g. 1ppm at 0.25Hz, or 1000ppm at 250Hz, etc in this particular case.My own project also had an AD9850 DDS module from ebay, with a minimum frequeny step of 0.0291Hz, and was using the reciprocal counting to measure the modules relative drift over time, with orientation, temperature and impact, and beyond all belief i ended up with 2 crystals that had a drift less than 2ppm from one to another, and a hystereses of 1.5ppm with impacts, and an offset of -7ppm, which remained true over the course of several days (it was new to me then and i wanted to see how well my DIY project fared)In the application is was intended for i never needed to count less than 0.5Hz or better than 0.5%, but it was nice to know that i had the capacity to measure very slow events very accurately, or by using many samples, had a way to measure fast signals to a very reasonable resolution.
I'd love to see more 'on location' videos - Page 1
Forum section: electronics / general

author: funkyant
author_rank: Unknown
timestamp: April 06, 2015, 10:37:22 pm
content: Hey Dave,A few of my favourite videos of yours have been the tour of Channel 9, the tour of the SMD manufacturing place, and the tour of the calibration container.You seem to somehow effortlessly tap into fellow engineers brains when interviewing them, probably mostly because you aren't some douchebag journalist, but are actually one of their peers asking intelligent questions that demonstrate some understanding of the subject.Anyway whatever it is, I love these vids and would like to see more like them.Thanks for the truly excellent contribution you make to the industry and to education.James
Grab bag of topic ideas - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: March 26, 2015, 09:19:27 pm
content: Maybe a sub forum onmechanical or shop/tool/materials skillsas used in electronics?Here are a few others..Tricks/hacks/extreme soldering"have part, what to do with it?" (possible uses for a part, also collected wisdom on it)Perhaps single sticky threads would do for them.Also, maybe an electronics "what is it"? (person shows tool or some kind of part they have not been able to ID, people who might know can ID it..)Another blog- bunnystudios has a monthly contest where he shows a PCB and obscure any identifying bits and people try to figure out what it is. Thats fun, IMO.Another useful area would be how to solve a problem.. people who want to solve some probem using electronics, kind of just asking for ideas on how to do something, pros and cons..??
PM'ing a user: Confirmation OK, but nothing in my sent list? - Page 1
Forum section: electronics / general

author: Cliff Matthews
author_rank: Unknown
timestamp: September 25, 2015, 07:21:47 pm
content: HI Dave, Dave 2 et al. Occasionally I send something to someone and it seems to be "hit or miss" if the user ever gets a text. I get a green confirmation text box, but am I must be doing something wrong?Oops sorry, just found the settings for it. I ass-umed it would be on by default... "Save a copy of each personal message in my sent items by default"

author: Simon
author_rank: Unknown
timestamp: September 25, 2015, 09:30:46 pm
content: Yes it seems that you have to specify that you want a copy saved of what you send. Really the whole PM system is a bit bonkets as it's like a forum thread with messages from multiple users.
"Follow thread button" - do we have one? - Page 1
Forum section: electronics / general

author: Greorge
author_rank: Regular Contributor
timestamp: March 15, 2015, 03:59:41 am
content: Hi,Do we have something like that on our Forum?Apologies if it is and I just did not find it.

author: retiredcaps
author_rank: Super Contributor
timestamp: March 15, 2015, 04:02:09 am
content: Notify button meet your requirements?

author: kolbep
author_rank: Frequent Contributor
timestamp: March 15, 2015, 04:02:59 am
content: Just above the top right corner of the posts, there is a Notify button.That does it....

author: Greorge
author_rank: Regular Contributor
timestamp: March 15, 2015, 10:21:32 am
content: Thanks for help."Watch Thread" button would be better, but have to get used to this method.Suppose another method would be to save Thread's URL in Favourites, in EEV Folder on my computer.

author: Neganur
author_rank: Unknown
timestamp: March 15, 2015, 11:07:56 am
content: no need to bookmark the thread, use notify and bookmark this address instead:https://www.eevblog.com/forum/profile/?area=notificationYou get 1 email if the thread is updated and only when you read the new post while logged in will it reset and send mails again.
Video/Tutorial On Transistors - Page 1
Forum section: electronics / general

author: Pug Swashbuck
author_rank: Newbie
timestamp: April 01, 2015, 09:08:44 am
content: I really loved the way Dave explained the basics of Op Amps in his. I think it would be greatly appreciated if he could do a similar video on transistors or other standard components in a similar way. The comment "I wish you could do one like this for transistors!" below has 15 likes and numerous +1's - I think many people would like such a video.Thanks!

author: SteveyG
author_rank: Unknown
timestamp: April 01, 2015, 09:28:48 am
content: I don't know about Dave, but I'm preparing a tutorial series on my channel for transistors.
More destructive fun? - Page 1
Forum section: electronics / general

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: March 15, 2015, 03:52:58 pm
content: I have a suggestion for an episode. Test surge protector power strips to their limits (and beyond!), similar to the high energy multimeter destruction episodeSeems like a good way to explain fuses, MOVs, ect. And blow stuff up.

author: bitwelder
author_rank: Super Contributor
timestamp: March 16, 2015, 06:36:37 pm
content: Please let's not go there.EEVblog != Mythbusters

author: deephaven
author_rank: Frequent Contributor
timestamp: March 16, 2015, 06:59:48 pm
content: Sounds like a job for Photoinduction

author: SeanB
author_rank: Super Contributor
timestamp: March 16, 2015, 07:08:52 pm
content: E popped for sure!

author: codeboy2k
author_rank: Super Contributor
timestamp: March 16, 2015, 07:26:50 pm
content: Well, there's certainly photonicinduction, if all you want is to be entertained.However, there is also a good reason to test the power strips, but that's a job for Consumer Reports, not Dave. I certainly do want to know which brands hold up to their stated protection claims and which do not. Consumer Reports would likely do a good job of it, since they have the lab specifically setup for this kind of testing (i.e. consumer products that might be dangerous). They also have the budget.Dave, on the otherhand, could choose to do an instructional video on circuit protection in general. The topic comes up here enough times that it would be a worthwhile video.

author: iamdarkyoshi
author_rank: Frequent Contributor
timestamp: March 16, 2015, 10:40:30 pm
content: Yah, i knew someone would bring up good ol' photon. It isnt really dave's normal thing, but sometimes doing something different is neat too. Also, i thought he had released a protection tutorial...

author: KJDS
author_rank: Super Contributor
timestamp: March 16, 2015, 11:00:20 pm
content: I've done some testing of lightning protection circuits in the past, it's a shame that I don't have a video of a solid 5mm copper bar being evaporated.
Low Power Circuitry - Page 1
Forum section: electronics / general

author: vargoal
author_rank: Regular Contributor
timestamp: January 09, 2015, 06:33:04 am
content: EEVBlog Community,I started this thread because I personally think it would be good for Dave to do a tutorial on electronics that use low current and/or low voltage. As a beginner in electronics not many of my projects use low power so I don't have much experience so I think a video highlighting tricks for young players would be useful. I want to leave the category general enough for other users so just anything low power. Post if you want Dave to do an episode on this and post any suggestions for relevant content.

author: tautech
author_rank: Super Contributor
timestamp: January 09, 2015, 07:09:56 am
content: It's called Micro-power electronics, there's a quite good chapter on it in The Art of Electronics by Horowitz
Tour of Dave's shop - Page 1
Forum section: electronics / general

author: Babbaj
author_rank: Newbie
timestamp: February 19, 2015, 03:54:30 am
content: I'd like to see a complete tour of the room that Dave makes videos in and an explanation of what everything does

author: dave_k
author_rank: Frequent Contributor
timestamp: February 19, 2015, 11:15:18 am
content: a) you should re-phrase it as a question, andb) you forgot to say please

author: jancumps
author_rank: Unknown
timestamp: February 19, 2015, 12:43:00 pm
content: Quote from: dave_k on February 19, 2015, 11:15:18 amI read a perfectly polite suggestion. Why the need for this reply?
Overall opinion on blogs of various types - Page 1
Forum section: electronics / general

author: fireant01
author_rank: Newbie
timestamp: February 12, 2015, 04:56:26 am
content: Dave: I find that many of the blogs I enjoy the most involve examining, or re-examining, older devices and bread boarding them coupled with your detailed explanations of the circuitry used in the data sheets. The recent voice recognition ckts from the 80's is a great example. Also stuff like the LM3904 LED driver, op- amp ckts, etc being revisited with new uses is really nice. The best message here as I see it is there are so many new uses for such standard products we once used as experimenters growing up. I also always like your teardowns of older kits as well as troubleshooting older and newer equipment. Again I see new uses for some of the older parts we once bread boarded and possibly later forgot in our parts drawers. In the U.S. Radio Shack (Tandy) is now selling off its stores in bankruptcy and it's a good time to snap up sales on any older treasures you might find left on the shelves. I suspect we will soon see much of this surplus on the internet marketplaces like EBAY.
Not the Tapatalk nagware again! - Page 1
Forum section: electronics / general

author: hlavac
author_rank: Frequent Contributor
timestamp: February 19, 2013, 07:51:19 pm
content: I am suddenly being bombarded by Tapatalk app popups again, did you update/reinstall this annoyware? It refuses to believe i don't want to buy it and keeps bugging me> Sent from my Nexus 7 using TapatalkAnd can you please disable these damn advertisements-in-every-message-ever?[Sorry, I'm allergic to Tapatalk]

author: shebu18
author_rank: Frequent Contributor
timestamp: February 22, 2013, 03:16:20 pm
content: The "advertisements-in-every-message-ever" are from your phone, look into the settings in tapatalk and you will find signature, disable it or print a space. The popups about buying are not generated by the forum rather by tapatalk itself.

author: Marco
author_rank: Super Contributor
timestamp: February 22, 2013, 03:21:37 pm
content: Quote from: hlavac on February 19, 2013, 07:51:19 pmI think you need some lithium :p

author: tylerl
author_rank: Contributor
timestamp: March 10, 2013, 09:42:42 pm
content: Quote from: hlavac on February 19, 2013, 07:51:19 pmThe tapatalk popup is part of the tapatalk compatibility plugin installed into the SMF software. It's this bit right here:https://www.eevblog.com/forum/mobiquo/tapatalkdetect.jsFor those of you who don't speak javascript, that whole file does nothing but this:Code:if not tapatalk_cookie ANDuser_agent contains_one_of("iPhone", "iPad", "android", "Windows Phone", "Symbian"):popup("This forum works with our crappy app! Click the damn button!")set_tapatalk_cookie(90 days)

author: tylerl
author_rank: Contributor
timestamp: March 10, 2013, 09:44:04 pm
content: obligatory XKCD:

author: carpelux
author_rank: Regular Contributor
timestamp: December 04, 2014, 11:12:58 am
content: Here we go again. Every topic I click on when using my iPhone gives me the tapatalk popup. How to get rid of that?I don't want and never will buy tapatalk. Browsing eevblog using the ordinary web interface works fine, or at least did work fine until all the tapatalk crap.

author: Stonent
author_rank: Super Contributor
timestamp: January 06, 2015, 03:53:06 pm
content: Yeah I got it on my phone the other day using the desktop version of the forum in Chrome.
Move EEVblab forum up one line - Page 1
Forum section: electronics / general

author: bitwelder
author_rank: Super Contributor
timestamp: January 01, 2015, 02:41:56 pm
content: Not a suggestion for future blogs, but for the forum:IMHO it would be more logical to have all "Dave's productions" forum areas together so I'd move the EEVblab area up one place in the forum list (or perhaps move Buy/Sell/wanted two places down, to keep also AmpHour together)
Strange uCurrent reading anomaly - Page 1
Forum section: electronics / general

author: nathancrum
author_rank: Contributor
timestamp: October 20, 2014, 03:20:24 pm
content: I have an odd uCurrent reading anomaly I'm very curious if anyone can figure out.I recently bought a uCurrent for work and was measuring the current draw of an Analog Devices ADXL362 accelerometer. In the sleep/wakeup mode I was getting an expected ~250nA draw. Active mode, the nA range is maxed so I switch to uA and I get -116uA??First I thought maybe I had it connected backwards? Double check connections - nope - connections are right.Then maybe battery is dying? 2.9V - nope. Changed out a fresh 3.0V CR2032 anyway. No difference.If I measure with the DMM directly - I get ~5uA (expected draw).If I measure voltage on the current terminals of the uCurrent I get 0.04mV on 10ohm (uA range) and 48.35mV on 10kohm (nA range). Those both agree with ~5uA current draw just fine.So I thought maybe my uCurrent was busted. So I measured current on a 100k resistor with a variable DC supply from 0.1 to 1.0V and nope - all measurements are perfectly fine. I got 1.0 to 10uA no problems.I put it back on the ADXL362 and I get -100uA again.If I add a 0.47uF cap on the power rails the output on the uCurrent drops to -65uA.If I add a 10uF cap on the power rails the output on the uCurrent drops to around -1uA.So - I assume there is some HF black magic going on here, but it is well beyond me. My scope is being used on another test setup at the moment, but I will probe it for more details when I get a chance.If anyone can think of a reason for why I get such bizarre readings using the uCurrent and the ADXL I'd love to hear it. The uCurrent appears ok, but something very strange is happening when connected to the ADXL and beyond the apparent affect of some kind of HF oscillations I have no idea why. Perhaps this would make a good EEVblog episode - I'm sure there's a trap for young players in there somewhere.

author: Rerouter
author_rank: Super Contributor
timestamp: December 25, 2014, 10:13:21 pm
content: Woudl this device be hooked up to something with a slightly higher supply voltage? if so the input protection diodes could be leaking that beck into the supply your measuring, (e.g. using a 3.3V device with a 5V micro?)

author: EEVblog
author_rank: Unknown
timestamp: December 25, 2014, 10:18:55 pm
content: Sounds like it has to be a very specific issue with your setup. Likely impossible to troubleshoot unless you are actually there.

author: Jeroen3
author_rank: Super Contributor
timestamp: December 25, 2014, 11:22:07 pm
content: How many possible power sources are electrically connected to the circuit under test? Even when it is only ground.
Cloudflare deliberate delays for DoS screening? - Page 1
Forum section: electronics / general

author: Richard Crowley
author_rank: Super Contributor
timestamp: January 30, 2015, 12:52:44 am
content: Just starting today I have seen several (4-5) delay screens (blank white page with rotating "wait" icon.)These appear to be from Cloudflare and say "checking your browser before...." something...something....And then it said something suggesting screening for DOS (Denial of Service) attack (?)I thought I saw one this morning from home (on my Frontier FIOS service).But most have been from my office here behind the Intel firewall NAT which is likely making all of us using EEVblog look like the same address (or the same small range).

author: nardev
author_rank: Unknown
timestamp: March 10, 2015, 11:18:32 pm
content: That is completely fine. CF for some reason "thought" request needs more checking

author: Monkeh
author_rank: Super Contributor
timestamp: March 10, 2015, 11:35:17 pm
content: Just CloudFlare making their mostly useless presence known. Bloody annoying.
Signal Propagation - Page 1
Forum section: electronics / general

author: xDR1TeK
author_rank: Contributor
timestamp: November 22, 2014, 10:28:23 am
content: Well, simply because I am still attending classes that one day will make an engineer out of me, I came across the topic : Transmission Lines. The half part of the black art of RF engineering. I imagine you all have heard of the Smith Chart? I haven't got any tools that would help in visualizing normal signals for amateur work let alone seeing propagating signals over a T-line. Dave, can you show us some real life examples using a scope how the signal might propagate through a long line? Standing wave? VSWR? Reflection? etc etc...Digital signals have similar behavior but pulses fluctuate at the desired output.Reflection is what interests me.

author: nixfu
author_rank: Unknown
timestamp: November 22, 2014, 07:18:23 pm
content: Check out fellow eevblog forum member Alan W2AEW youtube channel. He is one of my other top favorite youtube channels.Here is a video on coax, reflections and impedence.Here is another:Check out his channel, there are many other videos that would also interest you as well about similar topics.http://youtube.com/user/w2aew

author: tggzzz
author_rank: Super Contributor
timestamp: November 22, 2014, 08:39:46 pm
content: It is good to see someone extening their knowledge, just for the joy of it.In this case there are many many good resources on the net - some coming from an academic/mathematical viewpoint, some coming from a practical/hand-on viewpoint.Google is your friend.

author: xDR1TeK
author_rank: Contributor
timestamp: November 23, 2014, 08:10:40 am
content: Thanks guys, moral support is always appreciated.I just saw the first clip, it was brilliant. I couldn't believe my eyes.The folks from the olden days that imagined this hidden aspect of propagating signals didn't have scopes, nor did they have digital multimeters.It is mind blowing how they managed to accomplish this little yet massive feat of engineering.

author: GEuser
author_rank: Frequent Contributor
timestamp: November 23, 2014, 03:17:57 pm
content: Quote from: xDR1TeK on November 23, 2014, 08:10:40 amYes it is fascinating that the olden folks got up to what they did , study the old days a bit and one will find it is genuine brain power that made it happen , just on bits of paper and the likes and at the start they probably only built "test equipment" to show someone else that something either did or did not work .I would gather just like today that there would have been copying and/or pinching of ideas too also claiming this or that , I have said a lot that in the past that inventors or hobbyist's just made something work! then the scientist's or EE's came in and then told the first mob how it works , even though it was working in the first place .. just a thought typed .. cheers .

author: xDR1TeK
author_rank: Contributor
timestamp: November 24, 2014, 04:39:58 pm
content: True!!!
Simple amp meter - Page 1
Forum section: electronics / general

author: muffenme
author_rank: Contributor
timestamp: November 17, 2014, 12:02:34 am
content: I just wounding would this work. R1 is high wattage resister, I seen 100 watt 1 ohm resistor with heat sink on then at EBay. The R2 can be almost anything. If I'm right the voltage you read would be you amperage, you read 1V on the meter then you know the resistor 2 need 1A to power it.
Heatsinks - Page 1
Forum section: electronics / general

author: adamsk69
author_rank: Newbie
timestamp: November 07, 2014, 08:30:06 am
content: One for the episode wishlist please - I'd love an in depth geeky episode on heat sinking. Calculating the heatsink needed, using copper fills as a heatsink, using vias to draw heat from pads to inner planes and the other side of the board, etc.CheersAdam

author: nixfu
author_rank: Unknown
timestamp: November 07, 2014, 01:46:46 pm
content: In particular I think looking at the requirements for heat sink on linear regulators woud be a good excercise depending on voltage difference, current load etc.And throw in the magic required on how to read the datasheet on a regulator to determine this heat stuff as well.
EMC, layer stack and noise - Page 1
Forum section: electronics / general

author: fredboivin
author_rank: Regular Contributor
timestamp: October 03, 2014, 01:51:22 pm
content: Hi, this is my first post here!I've been watching many electronics blog for the past few years and EEVBlog is one that never fails to entertain and teach me. Keep up the good work!So I finished electronics engineering and landed my first job in the field and one of my projects include designing a circuit to pass tight regulatory tests. I've been reading a lot about it and there is so many details that need to be considered to reduce EMI, crosstalk, noise, etc... like layer stack, power plane stretch, via stitching, power decoupling, differential pair routing, line termination, filtering and so on.I think it would be very interesting to do a more in depth follow-up to episode #548 with emphasis on conception.Thanks!
Dropcam - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: October 18, 2014, 12:56:18 pm
content: The image onhttps://www.dropcam.com/p/Lvh0CGused to be a reasonable quality color picture but now all I see is a black and white picture that looks like it was taken through a fish-eye lens. Has something happened?

author: mswhin63
author_rank: Frequent Contributor
timestamp: October 19, 2014, 05:07:58 am
content: probably depends on the lighting, maybe has a automated feature for low light environment. I also see greyscale. Have to wait till the lights are on to confirm.

author: EEVblog
author_rank: Unknown
timestamp: October 19, 2014, 09:57:40 am
content: Quote from: wilfred on October 19, 2014, 12:35:32 amNo one beats me for pasty white nerdy legs.

author: EEVblog
author_rank: Unknown
timestamp: October 19, 2014, 09:58:58 am
content: Quote from: mswhin63 on October 19, 2014, 05:07:58 amYes. At night it goes into IR mode. There is a light outside in the corridor which lights it up a bit too, and the always on EXIT sign.
25Mhz, 100Mhz wave representation on different bandwidth scope - Page 1
Forum section: electronics / general

author: glatocha
author_rank: Regular Contributor
timestamp: October 22, 2014, 09:13:31 pm
content: After the Rigol teardown and excellent follow-up I have an interesting idea for a blog episode.Please show us, how the 25Mhz wave sine and square will look on the 25Mhz bandwidth scope and on the 50 or 100MHz scope.Saying it different way. What does the bandwidth really tell us and what limitation it produce!I think it takes some equipment to do that test: a generator, different scopes etc. and, Dave, you have them all.

author: tggzzz
author_rank: Super Contributor
timestamp: October 22, 2014, 09:48:32 pm
content: Quote from: glatocha on October 22, 2014, 09:13:31 pmThis is such a simple and fundamentally important topic that you will gain major benefits from understanding it on a general theoretical level - not just with one or two experiments. Once the theory is understood you will be able to predict what will happen with any digital waveform of any frequency with a scope with any bandwidth.That will be immensely useful to you multiple times in the future.It best understood by finding out:what frequency components are present in a square wave - or, more usefully, a trapezoidal wave with finite rise/falltimeswhat a square/trapezoidal wave with higher frequency components removed looks likewhich of those components would be removed by the scope's front end - or, more usefully, by the various filters that are invariably present in practical circuitsThere are many many many web pages on this subject, and they will give you a far better description than anything hacked together in this thread. Keywords: FFT, fourier series, trapezoid power spectral density

author: awallin
author_rank: Frequent Contributor
timestamp: October 23, 2014, 01:24:11 pm
content: FWIW: 100MHz Rigol vs. 500 MHz Tek.http://www.anderswallin.net/wp-content/uploads/2014/07/pulse_stretcher_test_keithley3390.pngandhttp://www.anderswallin.net/wp-content/uploads/2014/07/pulse_stretcher_test_PMT.png
@ dave :: a program on nuke radiation? (n relevant detection electronics?) - Page 1
Forum section: electronics / general

author: 3roomlab
author_rank: Frequent Contributor
timestamp: October 05, 2014, 04:12:32 am
content: @ davehi dave, do you think its possible to do a program (like the one you did with the DOUG FORD on mics, maybe you could reel in an expert in australia on nuclear physics?), but this 1 with a focus on nuclear radiation, its detectors (--> relevant electronics? DIY stuff?), some actual science lessons on nuclear radiation, etc ?i know it could be a tough subject to put on youtube, but there really isnt much on the net that is really educational about this, esp if there could be an actual physicists that would come on your show and talk about it, it be really great i think.cheers

author: Whales
author_rank: Super Contributor
timestamp: October 05, 2014, 06:46:59 am
content: FYI there is a suggestions forum specifically for this kind of stuff

author: 3roomlab
author_rank: Frequent Contributor
timestamp: October 06, 2014, 11:51:05 am
content: o thanks
Might be interesting piece of kit for a teardown - Page 1
Forum section: electronics / general

author: lukier
author_rank: Unknown
timestamp: October 01, 2014, 10:49:31 am
content: I saw these Nokia Siemens Networks base station system modules on eBay recently and I thought if Dave has some spare cash it would make a great teardown:http://www.ebay.com.au/itm/BRAND-NEW-Nokia-Mini-Flexi-BTS-FSME-System-Module-471469A-WITH-FPFB-CARD-/161142731933People are asking about PCBs with >16 layers and this is one of the purposes. I used to work for NSN some time ago, on the newer models of these puppies (LTE) and there is plenty of goodness there, FPGA/DSP, serious PCB design, rock solid two piece aluminium case, etc. Even the fans are top notch. Might be able to connect Ethernet to the first port on the left and telnet into the PowerPCAlthough, I doubt if one would be able to run the base station (even with the RF module - note, they need >120W 50 Ohm terminators or actual antennas, otherwise output amplifiers may let the magic smoke out) without all the remaining network infrastructure (RNC and further up the core network).System module with all the other modules installed (RF) can be quite power hungry, it is 48V DC and over 100A, I don't rememeber how much current the system module alone needs, it's been a while.Here I found a video with instructions for the people deploying these in the field:
no text - Page 1
Forum section: electronics / general

author: daywalkerdha
author_rank: Contributor
timestamp: December 05, 2012, 12:52:16 pm
content: no text

author: EEVblog
author_rank: Unknown
timestamp: December 05, 2012, 12:54:28 pm
content: Use a lower power LCD maybe, or a extra digit LED display at least?I think Bob has a list of issues with it or something?Dave.

author: cdacunha71
author_rank: Newbie
timestamp: December 05, 2014, 10:40:28 pm
content: Did you ever complete the arduino port of Bob Parker's ESR meter. I'm intending to do the same
Tear down suggestion - Page 1
Forum section: electronics / general

author: ziggyfish
author_rank: Regular Contributor
timestamp: September 25, 2014, 03:04:31 am
content: I have been interested lately in aviation and I would love to see whats inside some of these avionic systems, I would love to see a Garmin GNS 430 or Garmin G1000 tear down.

author: ziggyfish
author_rank: Regular Contributor
timestamp: September 25, 2014, 03:40:24 am
content: The Garmin 430 (http://www.mikeg.net/hobbies/aviation/avionics/maintenance/Garmin%20400%20Maintenance.pdf) are used in a lot of single engine aircraft.The Garmin G1000 is the Bee's knees when it comes to single engine PFDs and MFDs. They have Mode S transponders, CDIs Gyros, VSI, ADFs, Radio transceivers, airspeed indicators and flight computers (to calculate your groundspeed and other magic), autopilot and can monitor your engines.Put it this way a Garmin G1000 could replace your wife or girlfriend.

author: German_EE
author_rank: Super Contributor
timestamp: October 01, 2014, 07:58:24 am
content: Turns rightLooks at girlfriendNope, no chance.
guard trace blog? - Page 1
Forum section: electronics / general

author: ftransform
author_rank: Frequent Contributor
timestamp: May 26, 2013, 08:46:07 am
content: So, I read about guard traces and there seems to be a mixed opinion, some people say they work for reducing noise, others say its only the added distance that makes an effect.Can dave jones construct some experiments to illuminate this debate?do guard traces have any use in circuits that are not electrometers?

author: weilawei
author_rank: Newbie
timestamp: October 02, 2014, 05:09:14 am
content: I'm reviving the dead because, in EEVblog #667, Dave mentions guard traces in an annotation, without further explanation. As someone who's not an EE, but a hobbyist, I'd like to see a video on them. Fundamentals Friday is my favorite segment (but I still love all the others).

author: EEVblog
author_rank: Unknown
timestamp: October 02, 2014, 05:58:14 am
content: Yep, it would require a suitable test mockup to show the effect.Maybe not trivial, but I haven't given any thought what would be required there.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: October 02, 2014, 05:58:35 am
content: Guard rings exist to prevent accumulating a voltage offset from a small (nA) stray current going over the surface of the board, into a high impedance input. This is why these traces are exposed, to be able to absorb these surface currents. Linear tech describes this here:http://www.linear.com/solutions/1853Here's an image from that article with a negative feedback opamp reading a high impedance sensor, showing how the stray current is absorbed by the guard trace, instead of being injected to the positive terminal. Guard traces are relevant whenever there is a high impedance source of some kind. I've seen it in an IR thermometer, for example.

author: weilawei
author_rank: Newbie
timestamp: October 02, 2014, 06:39:46 am
content: Wow, The Dave Jones himself! (Okay, I'm done being awestruck.) I love the show, wouldn't miss an episode for the world. Keep it up!nitro2k01, that's an awesome little image that readily conveys the purpose of guard traces. I'm not sure I can measure down at nA levels with my very limited test gear, but I'm thinking it might be a fun experiment anyway. Thanks for that!

author: nitro2k01
author_rank: Frequent Contributor
timestamp: October 02, 2014, 07:12:51 am
content: I think you could actually use the layout in that image pretty much right away as a demonstration, together with a suitable opamp like the LTC2057, as suggested in the article. Replace the high impedance sensor with, say a 10 Mohm resistor to ground to simulate a high impedance sensor, and configure the opamp to produce a high gain. Put some low impedance traces like a supply rail around the guard ring. Now make a copy of that layout and remove the guard trace. Make boards of both the designs, and observe what the opamp does on the output side for both the boards. Maybe there are other variations that could be tried as well for demonstration purposes, like covering the guard traces with solder mask and seeing how effective they are then.
Blog suggestion....History of dev boards. - Page 1
Forum section: electronics / general

author: george graves
author_rank: Super Contributor
timestamp: September 17, 2014, 08:45:33 am
content: Hey Dave...I know you have a good collection of "pre-internet" mags and such. Care to walk up through the history of dev boards? What was the top sellers? Why one board won out over another? Feature creep?My first "dev board" was a sad Basic Stamp II thing. Cost $80, and I knew I could maybe use it for something. But a far cry from being able to use it in a product, or even own two or thee at a time as a broke college student.Let see a blog where you dig into the history of dev boards! Would be awesome!

author: george graves
author_rank: Super Contributor
timestamp: September 17, 2014, 09:36:43 am
content: Quote from: mswhin63 on September 17, 2014, 09:08:35 am

author: mswhin63
author_rank: Frequent Contributor
timestamp: September 17, 2014, 10:47:59 am
content: Yes, I have tried a couple of blogs just to get an idea and found once I tried to present something, another person had a load more time than myself and completed one before me.I haven't lost the want to do another one just not enough time and money to get decent cameras.Usually call stealing the limelight.

author: EEVblog
author_rank: Unknown
timestamp: September 17, 2014, 11:04:59 am
content: I'm still traumatised by my last attempted video looking through old mags, that's when I lots a whole days worth of research and content due to my Canon camera not recording properlyInteresting idea, but I have a bunch of other magazine ideas before I'd want to get to this one.Also, I was going to start a regular Wayback Wednesday segment looking through old mags.