hybridfree/eevblog-posts huggingface dataset:
IgniteSydney Talk - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: March 04, 2013, 05:25:54 am
content: I'll be giving a talk at Ignite Sydney, tickets are now available for those interested:http://ignitesydney10.eventbrite.com.au/Dave.

author: amspire
author_rank: Super Contributor
timestamp: March 05, 2013, 06:57:16 am
content: That will be interesting.I have heard that those Ignite talks are actually a lot of effort as you have a fixed 5 minutes and the slides automatically keep changing whether you are ready or not. Apparently it takes much more preparation then a 30 minute talk.Should be fun.Richard.

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: March 05, 2013, 07:50:01 am
content: I believe the Ignite talks actually started here in Seattle. They are a lot of fun to attend. You can learn about new things, and suffer through even the most horrible boring presentation for only 5 minutes.Here's one of my favorite Ignite presentations that explains the concept and shows that you can pack a lot of material in 5 minutes.

author: EEVblog
author_rank: Unknown
timestamp: March 05, 2013, 08:07:33 am
content: Quote from: amspire on March 05, 2013, 06:57:16 amYes, I'd better start actually writing it!Dave.

author: manicdoc
author_rank: Unknown
timestamp: March 05, 2013, 09:24:55 pm
content: Quote from: EEVblog on March 05, 2013, 08:07:33 amIt should be fun and everyone else will be in the same boat. I should be there also (not speaking!).Enjoy it.
Allow .ASC as attachment  - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: December 01, 2012, 11:42:55 am
content: Dave,Please enable/allow .ASC file which is saved circuit simulation from LTSpice to be an attachment in the posting. Its quite popular anyway.TIA

author: nitro2k01
author_rank: Frequent Contributor
timestamp: December 01, 2012, 07:51:55 pm
content: Just put it in a zip archive.
Blog suggestion - how multimeters work - Page 1
Forum section: electronics / general

author: vampi-the-frog
author_rank: Regular Contributor
timestamp: November 26, 2012, 10:27:29 pm
content: Hi Dave. I think it would be a nice idea if you explained how current, voltage, resistance, capacitance, and inductance meters work. What's the principle behind them? You explained some of this in your power supply series, where there was the current shunt and the two op-amps, but what about resistance, capacitance and inductance? How do we measure them digitally? How about other measurements? Frequency? I dunno.

author: EEVblog
author_rank: Unknown
timestamp: November 26, 2012, 10:39:33 pm
content: Try:Dave.

author: vampi-the-frog
author_rank: Regular Contributor
timestamp: November 27, 2012, 03:38:09 pm
content: Doh! I should have searched in your uploads. Thanks.
"Behind the scenes" video of a teardown - Page 1
Forum section: electronics / general

author: reagle
author_rank: Unknown
timestamp: October 23, 2012, 08:13:19 pm
content: It would be interesting to see what goes on behind the scenes when Dave does a teardown. It all looks very easy and seamless, but I am sure lots of prep and homework is done before it all comes together?

author: fenclu
author_rank: Regular Contributor
timestamp: October 23, 2012, 08:25:31 pm
content: Yes, I always wonder this. That's actually not a bad idea. It's all up to the Master Dave...

author: EEVblog
author_rank: Unknown
timestamp: October 23, 2012, 09:15:41 pm
content: Prep? Yeah, making sure the battery is full and the SD card is empty.Homework? Yeah, 10 seconds on google making sure I have the basic specs half right for the intro.Press record, and then occasionally google part numbers as they come up.Dave.

author: reagle
author_rank: Unknown
timestamp: October 24, 2012, 03:06:01 am
content: That's very impressive Dave! Just seeing how much effort it takes any time I do a written teardown to make it worth the time for people to read, I am sure video ones take an even more non-trivial amount of time, or you are just that much better

author: EEVblog
author_rank: Unknown
timestamp: November 06, 2012, 09:29:13 pm
content: Quote from: reagle on October 24, 2012, 03:06:01 amI'm not saying it's quick though, I like to dick aroundTake the current CCD video teardown. That 27min video had 49min of actual footage in 68 clips that took just under 3 hours to shoot.What I did with that extra 2 hours I have no idea. Obviously I fiddle with the tripod a lot and love screwing that macro lens in and outI do shoot everything "in sequence" as you see it in the final video. So if the tripod gets moved or the macro lens gets changed from shot to shot, I'm actually doing that every time.Occasionally I'll replay a shot to make sure I got something, but it's common for me to think I've pressed record and captured a clip only to find when I get home and edit that its not there. That's bound to happen in a video with say a hundred clips.Dave.
Feature request. Forum Latex support. - Page 1
Forum section: electronics / general

author: TheBrick
author_rank: Regular Contributor
timestamp: November 06, 2012, 08:51:14 pm
content: Hi Dave.Maybe pie in the sky request but is there any chance of Latex support for the forum? There are several plugins available e.g.http://code.google.com/p/phpbb-latex/It just makes adding any maths to posts so natural.

author: Monkeh
author_rank: Super Contributor
timestamp: November 06, 2012, 09:07:04 pm
content: Is it really that hard to notice that this isn't phpBB?

author: EEVblog
author_rank: Unknown
timestamp: November 06, 2012, 09:13:55 pm
content: This forum runs Simple Machines, not phpBBDave.

author: TheBrick
author_rank: Regular Contributor
timestamp: November 06, 2012, 09:15:38 pm
content: Its an example that there are plugin available for forums. Which one this is I don't know, I've not run a forum but I bet this is forum is running popular forum software.Thanks for your comment Monkeh.

author: TheBrick
author_rank: Regular Contributor
timestamp: November 06, 2012, 09:17:16 pm
content: Specific simple minds forum software plugin for interest parties.http://custom.simplemachines.org/mods/index.php?mod=1111

author: Monkeh
author_rank: Super Contributor
timestamp: November 06, 2012, 09:17:27 pm
content: Quote from: TheBrick on November 06, 2012, 09:15:38 pmIt's right down the bottom there, it's kinda hard to miss.There's this:http://custom.simplemachines.org/mods/index.php?mod=1111Don't ask me if it'll go onto 2.0.2 without work.

author: EEVblog
author_rank: Unknown
timestamp: November 06, 2012, 11:35:57 pm
content: Quote from: TheBrick on November 06, 2012, 09:17:16 pmIt's not compatible. Latest update 2009.What is Latex anyway?Dave.

author: Monkeh
author_rank: Super Contributor
timestamp: November 06, 2012, 11:37:29 pm
content: Quote from: EEVblog on November 06, 2012, 11:35:57 pmIt's a markup language, often used for mathematic notation.http://en.wikipedia.org/wiki/LaTeXThat mod probably can be made to work fairly easily if it doesn't apply as-is.

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: November 07, 2012, 11:31:55 am
content: There is aonline Latex equation editorhere that I use when I want to make nice looking equations for forum posts or articles.An example is posted here.The results of using Latex are impressive but I wonder if enough people know how to use it, or would use it to make implementation worthwhile. I like the equations the online system generates, but it takes me a lot of effort and a lot of trial & error to use it to get those results.
Vote for me in the 2012 Streamy Awards! - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: November 03, 2012, 01:53:15 am
content: LAST DAY to vote for that crazy aussie bloke in the 2012 Streamy awards. It's like some very prestigious thing, apparently.http://www.eevblog.com/2012/10/04/vote-for-dave-in-the-2012-streamys/You need a Twitter account though unfortunately.Thanks.Dave.

author: ablacon64
author_rank: Frequent Contributor
timestamp: November 03, 2012, 02:31:57 am
content: Let's see where this goes.Guess most people will vote themselves? A draw in the end? hehehehhe...
Blog Suggestion - Page 1
Forum section: electronics / general

author: LAZLOT
author_rank: Contributor
timestamp: October 29, 2012, 07:27:37 am
content: I'd love to see a series about component selection. Eg; why use a FET compared to a standard tranny, or why choose b/w a ceramic cap or a tantalum... Just two examples of many potentials, but a separate blog for each basic component type, then outlining the differences b/w each variation would, I think be of huge benefit for many newbies, and for people like myself who are self-taught; I have strong fault-finding skills, but can't design a circuit to save my life!
Rigol DS4000 Teardown - Page 1
Forum section: electronics / general

author: branadic
author_rank: Super Contributor
timestamp: December 05, 2012, 08:20:50 pm
content: What about a Rigol DS4000 teardown? This would show what is similar to the DS2000 series and the potential of the input stage.

author: tom66
author_rank: Super Contributor
timestamp: December 06, 2012, 07:32:19 pm
content: Rigol would need to send Dave one...

author: Smokey
author_rank: Super Contributor
timestamp: December 06, 2012, 10:51:14 pm
content: As it turns out they tried to send him a 4000 series first and he turned it downhttps://www.eevblog.com/forum/reviews/agilent-dsox3014a-vs-tek-dpo3014-vs-rigol-ds4014/msg136818/#msg136818
Rigol spec analyser tear down - Page 1
Forum section: electronics / general

author: tom66
author_rank: Super Contributor
timestamp: October 18, 2012, 06:30:35 pm
content: Have you still got the Rigol DSA815?Can you do it for Teardown Tuesday?Would be interesting to see what a budget spectrum analyser looks like inside, compared to the Tek MDO and the Anritsu one Mike tore down.

author: Benno
author_rank: Newbie
timestamp: October 18, 2012, 09:39:19 pm
content: would be interested in that too.Tom do you have a link to that Anritsu teardown?

author: tom66
author_rank: Super Contributor
timestamp: October 18, 2012, 09:55:26 pm
content: Anritsu teardown:
What do you need those resistors'n stuff for? - Page 1
Forum section: electronics / general

author: Hackwar
author_rank: Newbie
timestamp: February 01, 2013, 10:06:22 pm
content: Hey Dave,now I'm still a bloody beginner, so one of my main questions is: What do I need all those resistors and stuff for in a circuit. Basically, I got an Atmega328 and it says, it would work with 1.something to 7.something volt and then I got a bunch of chips that I attach via I2C or SPI and they have similar power characteristics. Now I have a battery pack of 3.7V, so why couldn't I simply solder the leads from my batteries onto the chip and have a go? Instead there are resistors and capacitors and some more transistors in there and I'm simply wondering: What for? I'm only guessing that it is to control the environment of my IC better, but that is all pretty foggy to me.If you'd really want to make me happy, you would show how to build a proper battery powered circuit with an atmega328, like a dumbed down Arduino style board.Thanks!Hannes

author: mariush
author_rank: Super Contributor
timestamp: February 01, 2013, 10:32:22 pm
content: Here's a video that might explain some of the reasons why those pesky resistors are used:Here's another useful thing you can do with resistors:
Dave's esoteric lab equipment..... - Page 1
Forum section: electronics / general

author: george graves
author_rank: Super Contributor
timestamp: October 17, 2012, 11:42:10 am
content: Dave - I noticed in your lab, you have some really specialized gear. Not something that the average bloke would have. Micro current, and micro volt stuff. What do you need it for? Why did you buy it? In what situation do you reach for it? How do you keep it calibrated?I find it really interesting watching your videos, that you'll naturally go for a "kit" power supply and not something newer. It's not something you talked about - other than outside of the whole "confidence" of measurement and test gear.Would love to know more. I think you know the question I'm asking....but I honestly only know enough to ask why!

author: EEVblog
author_rank: Unknown
timestamp: October 17, 2012, 12:20:54 pm
content: Quote from: george graves on October 17, 2012, 11:42:10 amYes, I've got 4 Keithley units that allow me to generate anything from nV to 1000V in any step you like, and fA to A in any step you like.QuoteBecause I thought they were cool. And once you get one, you have to get the complete setSome people like people like high voltage/high power gear, I like low voltage/low power gear.QuoteHardly any, I just like to fiddleThe 225 current source is useful sometimes because it can generate "real world" useful constant currents up to 100mA.QuoteCross checking with other gear and standards. I don't pay to get them formally calibrated.e.g. it's not hard to check a constant current source if you have a simple resistance standard and precision multimeters.Dave.
Tutorial on part selection when requirements are simple - Page 1
Forum section: electronics / general

author: tcort
author_rank: Newbie
timestamp: October 11, 2012, 12:50:02 am
content: How does Dave Jones choose a pull-up resistor for a project? I'm curious to know what an engineer thinks about when choosing from thousands of parts that could do the job.

author: Simon
author_rank: Unknown
timestamp: October 11, 2012, 06:45:22 am
content: erm 1-10K does the jobs depends on how much power you can piss away. I think your question really is, what are the common jelly bean parts

author: Rerouter
author_rank: Super Contributor
timestamp: October 11, 2012, 07:51:44 am
content: probably somethign along the lines of most people designing something, know which supplier your getting most of your parts from, list all of the value your interested in and find the cheapest in the size your looking,even for more specific passives, its generally just putting a temp coeficient or a tolerance before the price a little, and in general what even works within your error budgeti will say from my own recent escapades, that powers of 10 seem to be a bit cheaper than the other values, e.g.a precision 100K is 14c (one of), but 180K can be far higher, on the order of approaching 50-60c

author: EEVblog
author_rank: Unknown
timestamp: October 11, 2012, 10:22:29 am
content: Quote from: tcort on October 11, 2012, 12:50:02 amIt's easy. You start with 10K, which is:a) A nice round value you are likely using elsewhere in your designb) Not too low in value to be pissing away current (5V/10K=500uA), or cause grief to any puny driver.c) Not too high in value to let in any noise or be a problem with line capacitance.So in a typical design the "pull-up of choice" would be 10K, with maybe 100K or 1M for more power sensitive designs if required.Or a lower value (like 2K2) for say an I2C bus that needs a lower value because of the line capacitance and open collector design.It's a surprisingly interesting topic when you get into the detail!Dave.

author: hans
author_rank: Super Contributor
timestamp: October 11, 2012, 01:05:48 pm
content: Yes there are both lower and higher limits.The lower limit is determined by the amount of current each open collector(transistor that pulls down to GND) can sink. Sure you can have a pull-up of 470 ohms, but at 5V that's ~10mA. Can every I2C or 1-wire device handle that?The higher limit depends on the bus situation , speed, etc. A bus will gather capacitance and with a too high value it won't be able to rise fast enough (because the pull-up resistor has to charge this 'capacitor'). Either lower the speed or lower the pull-up resistor.Noise is also something involved in this (in the end the bus becomes more of a high impedance state in pulled up condition).And then there is low-power requirements..Would make for an educational video indeed.
Live Show 8th Oct - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: October 07, 2012, 01:15:48 am
content: Another Live show tomorrow:http://www.eevblog.com/live-show/Dave.

author: fenclu
author_rank: Regular Contributor
timestamp: October 07, 2012, 09:26:07 am
content: Finally a live show which I'm gonna be able to watch!See ya in eleven hours!

author: EEVblog
author_rank: Unknown
timestamp: October 07, 2012, 09:57:09 am
content: Quote from: fenclu on October 07, 2012, 09:26:07 amYes, with daylight savings here it means almost everyone should be able to watch it at a reasonable time.Dave.

author: fenclu
author_rank: Regular Contributor
timestamp: October 07, 2012, 10:47:24 am
content: Well to be frank, I've watched EEVblog since arround the 9th live show. I missed the 9th because back then I didn't even know about it and I missed the last one because I mixed up June with JulyThere's no way I'm missing this oneBut thanks for sacrificing and getting up so early!

author: TerminalJack505
author_rank: Super Contributor
timestamp: October 07, 2012, 08:37:19 pm
content: *Bump*Reminder: This is scheduled to happen now.
Old Function Generators - Page 1
Forum section: electronics / general

author: M0BSW
author_rank: Frequent Contributor
timestamp: September 29, 2012, 04:45:42 pm
content: I love a blog done on old Functions generators , how to use them mine I think is old , it's a Black*star ,Jupiter 500, lots of functions on it it goes from 0.1 to 500k HZ sine,saw,square waves freq multiplier coarse /fine output amplitude/DC offsetlots more & i'd love to get the best from it, it works fits my current budget, and I 'd like to understand it better.So how a bout a get back to basics blog for old ,loved gear.
Review -  Classic Vintage Test And Measurement Stuff - Page 1
Forum section: electronics / general

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: September 18, 2012, 08:50:18 pm
content: Dave ,It Would Be Nice if you could review some classic products1 :VTVM's2 : VOMS3 : FET VOMS4 : Some Excellent Transistor And Capacitor Testers

author: steve30
author_rank: Frequent Contributor
timestamp: September 28, 2012, 07:07:25 pm
content: Seeing some vintage test gear would be good. I'd like it.But I've no idea if Dave is fond of old stuff or not.
Agilent 2000 series vs Rigol 2000 series   - Page 1
Forum section: electronics / general

author: glee
author_rank: Contributor
timestamp: September 19, 2012, 03:31:21 am
content: Dave, given that these are probably scopes that are (almost?) within reach of much of the audience here at EEVBlog, is there any chance of a comparative review?

author: EEVblog
author_rank: Unknown
timestamp: September 19, 2012, 06:17:03 am
content: Quote from: glee on September 19, 2012, 03:31:21 amI have the Rigol DS2000 in the lab now. Review will becoming in due course, and at least some comparison with the Agilent 2000 will be likely. But no plans for a direct side-by-side shootout.The Rigol will almost certainly win on bang-per-buck with it's huge memory. But it lacks that useful function gen and a 4 channel option.Dave.

author: glee
author_rank: Contributor
timestamp: September 19, 2012, 08:55:01 am
content: Fair enough. Thanks for the update. Looking forward to the review.I notice that the Rigol DS2000's have mysteriously disappeared from the Emona listings over the past couple of days ... I wonder if they're having issues with supply?

author: EEVblog
author_rank: Unknown
timestamp: September 19, 2012, 12:28:49 pm
content: Quote from: glee on September 19, 2012, 08:55:01 amThey seems to be having an issue with their site at the moment.Dave.
Attn: Dave, Twitter replies - Page 1
Forum section: electronics / general

author: nitro2k01
author_rank: Frequent Contributor
timestamp: September 15, 2012, 12:01:11 pm
content: This is a bit minor, sort of a first world problem, but I thought I'd bring it up. It seems like the way Dave responds to tweets, disables a function that lets you view the conversation. To do this correctly, you ideally have to click the reply button under a tweet, which will cause this connection to be made. To illustrate the difference this makes:The tweet1 image is from Patrick's Twitter, and has a "show conversation" link. Here shown as "hide conversation" since the conversation is collapsed. Of course, in longer conversations, you can follow the whole conversation with just a couple of clicks.

author: EEVblog
author_rank: Unknown
timestamp: September 19, 2012, 06:19:18 am
content: I didn't think about that.I use the ReTweet function in Tweetdeck because it inserts the text so I can respond to a point. Which makes more sense for people who just see an individual tweet.Dave.
Stability (Poles and Zeros) + Capacity load + Phasors - Page 1
Forum section: electronics / general

author: cborrero2000@hotmail.com
author_rank: Newbie
timestamp: September 13, 2012, 05:47:56 pm
content: Hi All,I would like to make a suggestion for a Video blog, this subject I haven't been able to connect the dots and apply it in a practical application or circuit analysis.I would like a video blog that will cover these topics and how they relate to each other:* Basis of stability (zeros and poles)* How capacity loads have a big impact in the circuit stability* What role phasor plays when analyzing the stability of the system* One practical example of this if possible
Your favourite/not favourite vidcasts/podcasts & netcasting practices - Page 1
Forum section: electronics / general

author: vk3pb
author_rank: Contributor
timestamp: September 05, 2012, 12:15:24 pm
content: Hi DaveCould you please do a blog about your favourite and not so favourite vidcasts and podcasts i.e. the stuff you like to listen to on your Itouch or watch on your Roku box? More importantly I'd like to hear you get stuck into some of the podcast/vidcasts practices you detest - the stuff that really turns you off be it commercials, product placement, bad audio... whatever. You might have a few words to say about some of the TWIT or Revision 3 netcasts or presenters for example. Don't hold back!That aside I'd also like to hear your views about funding models for up and coming podcast/vidcasters. Should they do ad reads for Gotomeeting.com and Squarespace.com or should they leave the podcast in its pristine uncommercial state and make money indirectly via the sale of branded goods and Amazon commissions? I know you have been trying the latter approach for a while but I don't know whether it has proved successful or not for you. This is of personal interest to me as I often watch and listen to vidcasts and I wonder whether the hosts are making any money out of their shows or not.Aside from the above I won't recommend any particular podcasts/vidcasts to review. I would just like to hear which ones are your favourites and not so favourites.cheersPeter VK3PB
Increased EEVblog podcast resolution - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: September 14, 2012, 02:03:33 am
content: As of video #351 I'm upping the resolution of the podcast video file from 480x270 to 640x360.The aim is to the keep the file size the same but increase the compression and get better resolution.I've tried it and it looks pretty good, seems to be the same visual quality, but now increased resolution, and roughly the same file size.Let me know what you think.FYI, I'm now using an RF value (Constant Quality value) of 26 in x264 instead of 24.Dave.
rigol 1052e spectrum analyzer mod compared to a real spectrum analyzer! - Page 1
Forum section: electronics / general

author: ftransform
author_rank: Frequent Contributor
timestamp: October 29, 2012, 08:51:58 pm
content: We have the ships.We have the weapons.We need soldiers.Soldiers like Lieutenant Dave Jones.I think it would be appropriate considering the vast rigol 1052e support. It would be nice for dave to get down to his 1052e roots. I've started to feel a bit disconnected from the blog because of all the high end gear that is being reviewed.http://hackaday.com/tag/spectrum-analyzer/https://www.eevblog.com/forum/general-chat/using-rigol-ds1052e-for-spectrum-analysis/You covered the 100mhz mod, so why not this? Especially now that you have a real spectrum analyzer.its pure eevblog!repost to suggestions
Tablet teardown/review - Page 1
Forum section: electronics / general

author: wilfred
author_rank: Super Contributor
timestamp: August 28, 2012, 11:30:20 pm
content: /

author: T4P
author_rank: Super Contributor
timestamp: August 29, 2012, 07:42:23 pm
content: Well they don't come by so easily but i do have one that nobody uses at my house (too shitty)1GHz and still hopeless ... Infotmic X220And the worst LCD i've seen in my life, i might tear it down for you guys some day but i'm using it to read datasheets
battle for portable scopes? - Page 1
Forum section: electronics / general

author: M. András
author_rank: Super Contributor
timestamp: August 29, 2012, 07:42:37 pm
content: now there is a 200MHz portable scope from agilent too with 2Mpts of memory(u1620) cat III ratings 2gigasamles/s. fluke 190 II series with cat IV ratings 2.5gigasamles/s and with "deep memory" 10kpoints/channelwonder the same signal how would looks like on them

author: T4P
author_rank: Super Contributor
timestamp: August 29, 2012, 08:05:43 pm
content: Go onto element14.com/roadtest and look for the U1620 reviews under review sectionsI didn't get it :/
Review the "Unimprinted Electrical Device" the modern tinfoil hat!! LOL!! - Page 1
Forum section: electronics / general

author: quirmche
author_rank: Contributor
timestamp: August 07, 2012, 10:42:56 pm
content: I thought Dave might have some fun with this one, or anyone here on the forum.The links are plans for a device that reads your intentions. That's right, an engineer William Tiller, PhD no less, from Stanford University has plans for the "unimprinted electrical device" which is supposed to read the intentions of meditators. Kind of like a Chi or Qi reader.Link one of the "white paper" which includes the schematic for the device.http://tillerfoundation.com/White%20Paper%20II.pdfLink two is to a discussion board some posed to the forum regarding the validity of the circuit "electronics-related.com", funny stuff!http://www.electronics-related.com/usenet/design/show/188153-1.phpLink three has another write up on the device with better schematics.http://www.scientificexploration.org/journal/jse_13_2_dibble.pdfI can see the rant now....!!!!!!!!!!!!Me...Still trying to figure out how data are controlled by "imprinting 'psychoenergetic intention'".

author: ftransform
author_rank: Frequent Contributor
timestamp: August 09, 2012, 08:39:02 pm
content: there is no spoon

author: pickle9000
author_rank: Super Contributor
timestamp: August 09, 2012, 09:26:05 pm
content: Is it a ghost or god detector??
Microcontroller Interfacing to the industrial World for Rasp Pi - Page 1
Forum section: electronics / general

author: Rudolfo
author_rank: Contributor
timestamp: August 09, 2012, 09:17:46 am
content: To interface the microcontroller with industrial I/O here is a nice universal PCB for the Rasp Pi 16 16 24V I/O and analog input:http://www.raspberrypi.org/phpBB3/viewtopic.php?t=9556&sid=a98d84943f7db20dd53348135d463765and the iC-JX DS:http://www.ichaus.biz/product/iC-JXIt is opto isolated as well.Enjoy our design work!
PoE Controller Review - Page 1
Forum section: electronics / general

author: H3llCaT
author_rank: Newbie
timestamp: August 06, 2012, 12:40:54 pm
content: Hey Guys,This is my first post on EEVBLOG good to be a part of this wonderful community of this EE community.I have been doing some projects recently which incorporate IEEE 802.3at or 802.3af standard PoE controllers. PoE is becoming so popular I think it would be a great idea if a review could be done on some of the popular PoE PD controllers on the market.
Episode about mosfets - Page 1
Forum section: electronics / general

author: kurohyou
author_rank: Newbie
timestamp: July 31, 2012, 08:36:49 pm
content: Hi Dave,i would like to see an episode about mosfets :- How do you choose on the distributors website which one to get. (For what to watch out for)- A little explanation how to read the data sheets- logic level fet's, how to use them directly from the micro-controller, not 1 but for example 10 logic level fet's on 1 micro, precautions to take, capacitors to use so we have enough current to drive the micro.- Non logic level fet's driving directly from the micro controller.I had a problem a month ago, i was driving 10 p channel mosfets (NDT2955) from an atmega32, i had a resistor between the the gates (120 Ohm). I was driving common anode rows of rgb led at a fast rate. The problem was that the micro was constantly rebooting, after a check on the oscilloscope i saw i had some major spikes on the voltage of the micro. So i added a 470 nF MKT cap on the micro. No problems so far. But i don't think this is the best solution longterm.After some searching on different forums it was like nobody had some real solutions, check digikey, check the data sheet, check google. All great propositions but no real answer. So i guess i'm not the only one that had a difficulty here with this.greets, love the show.
Pragmatic Proof of Basics - Page 1
Forum section: electronics / general

author: kfitch42
author_rank: Frequent Contributor
timestamp: July 27, 2012, 06:52:35 pm
content: I would really appreciate more videos along the lines of the infinite resistor puzzle #25, Gaussian resistors #215, or the one that used the high precision frequency counter to demonstrate the lack of stability/accuracy in the internal oscillator of a microcontroller (can't find that one right now). I had heard that you need an external crystal to do async/rs232 stuff on a micro, but didn't really get it until I saw that video.http://www.eevblog.com/2009/08/15/eevblog-25-the-infinite-resistor-puzzle/http://www.eevblog.com/2011/11/08/eevblog-215-gaussian-resistors/Basically I really like seeing assumptions/rules of thumb demonstrated with real world data. I guess many of the 'myths' videos fall into this category.One particular idea would be "Decoupling Caps ... do I REALLY need them".This comes from my own personal experience as a "young player" ... more like complete newb.https://www.eevblog.com/forum/beginners/my-first-scope-my-first-555-circuit-questions/

author: kfitch42
author_rank: Frequent Contributor
timestamp: July 29, 2012, 06:23:40 pm
content: OK, I'm an idiot. Turns out the video I was thinking of about the on-chip oscillator was not an EEVblog video. DOH. Here is the link:But, this is an example of the kind of stuff I would like to see more of.
Wireless anti static wrist straps - Page 1
Forum section: electronics / general

author: openthomas
author_rank: Contributor
timestamp: August 24, 2012, 09:42:04 pm
content: HiThey are selling these on Amazon now. If they work that is really something I would like to use. But I need to see some real world tests.http://www.ohgizmo.com/2008/12/26/bho-anti-static-wristband-eliminates-the-need-for-a-ground-wire/Could be a good review.

author: Monkeh
author_rank: Super Contributor
timestamp: August 24, 2012, 10:42:57 pm
content: Yes, it would be amusing to see that complete bollocks get reviewed. And then hit with a very large hammer.

author: nanofrog
author_rank: Super Contributor
timestamp: August 24, 2012, 11:26:24 pm
content: Stuff like this has been offered before from various sources, and it doesn't work. Take a look here:http://www.esdjournal.com/techpapr/sfowler/wireless.htm

author: T4P
author_rank: Super Contributor
timestamp: August 25, 2012, 06:30:52 pm
content: What sorcery is this?! Where the heck does the discharge go?

author: SeanB
author_rank: Super Contributor
timestamp: August 25, 2012, 06:49:29 pm
content: Amerecium, a prolific alpha emitter, and used to make those old fashioned antistatic record brushes. Static disappears like magic, though going through an airport may get you a quiet room to talk in.
video blog on scope probes seriously needed - Page 1
Forum section: electronics / general

author: KTP
author_rank: Frequent Contributor
timestamp: July 29, 2012, 01:49:05 pm
content: I would like to see a 1 hour Dave blog on just oscilloscope probes.There is a lot of information inhttp://www.slack.com/TE/TekConcepts/TekProbeCircuits.pdfIt is a bit dated, and I am not sure how the current high bandwidth passive probes are designed, but this could be covered in the blog.A comparison of several probes, ranging from cheap chinese $9 60mhz passive probes, decent 300mhz passive probes, active probes, and maybe differential probes. Compare the same signal (fast pulse and high speed pure sine) using these different probes. Compare the signal to what you get directly into 50 ohm cable and 50 ohm termination. Detail situations where you should use each.

author: ftransform
author_rank: Frequent Contributor
timestamp: July 29, 2012, 06:09:36 pm
content: I think there is one about high voltage probes out btw.
EEVblog #322 - Google Nexus 7 Review - Page 1
Forum section: electronics / general

author: wilfred
author_rank: Super Contributor
timestamp: July 25, 2012, 10:02:48 am
content: /

author: EEVblog
author_rank: Unknown
timestamp: July 25, 2012, 10:27:29 am
content: Quote from: wilfred on July 25, 2012, 10:02:48 amI usually have that option turned on. But I probably had manual focus accidentally set for this, I'm always chopping and changing for various things.I'm currently trying to run priority at a fixed high aperture, so there is more DOF, which helps a lot for viewing boards at angles etc.QuoteAFAIK it does not have that option.Dave.
iTunes issues? - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 17, 2012, 08:53:39 am
content: Anyone having issues with playing the iTunes podcast version since #308?Dave.

author: PeterG
author_rank: Frequent Contributor
timestamp: July 17, 2012, 09:06:59 am
content: No idea, dont use itunes....lolRegards

author: jhalar
author_rank: Regular Contributor
timestamp: July 17, 2012, 10:22:14 am
content: No issues with the iTunes podcasts (using a Mac). All OK for me.

author: Mint.
author_rank: Frequent Contributor
timestamp: July 17, 2012, 11:33:23 am
content: I used to download the EEVBlog episodes on my iPad and some of them gave me errors e.g. file not found or something similar, but that was like 6 months ago. Haven't used the iTunes since then.

author: CHexclaim
author_rank: Regular Contributor
timestamp: July 17, 2012, 03:31:54 pm
content: Hi,No and maybe yes. I think one episode downloaded in the wrong order, ie: I do not remember the episode numbers but, as an example, lets suppose #310 downloaded (maybe days) before #309. But now they are all ok.Of course it takes some time for a new episode to be available in itunes after being published in youtube by Dave, but I believe that's ok.I use itunes + iPad because, as I travel a lot, it is then that I have time to watch the episodes, plus listen to The Amp Hour. In fact I was able to catch up and watch all the episodes from #1 onwards. As Dave says, it works for me this way.Regards, Charlie@Chexclaim
Video series about developing a switching power supply for laboratory use - Page 1
Forum section: electronics / general

author: lordnoxx
author_rank: Contributor
timestamp: July 15, 2012, 11:08:40 am
content: Hi Dave,I wondered whether you could start a little video series about developing a switching power supply? Let's say with 2 outputs0 to 30 Volts and 5 Amps each. This series could contain a discussion about the different basic DC-DC topologies and finally which one seems to be the best for such a power supply. You could cover some basic physic about inductors and capacitors and how to choose them for our specific specifications and topology as well as some thoughts about control loops.So what do you think about that suggestion?Many thanks from Germany!PS: Keep on teaching...I like eevblog so much

author: Psi
author_rank: Super Contributor
timestamp: July 15, 2012, 11:10:45 am
content: Isn't that pretty much what he's already doing with his Usupply project.

author: Rerouter
author_rank: Super Contributor
timestamp: July 15, 2012, 11:29:59 am
content: still in my mind for lab use rev 2 was the winner on the schematic, you just either have to use pwm and deal with a slow response, or throw down some money on a high accuracy DAC, (if you saw the usupply series, you would see the issues dave had)2 outputs generally would just involve doubling the regulator stages, and if your working with switching pre-regulators, either balancing the regulation loop to a point where the linear stage can handle it, for a multi output switcher or using 2 seperate switchers,

author: madires
author_rank: Super Contributor
timestamp: July 15, 2012, 03:56:18 pm
content: Hi!There are a lot of nice LM-whatever buck converters for different currents. For 5A you could use a LM267x. The LM2679 got a current limitter for example. Add an additional ripple filter and over/reverse voltage protection and you got an inexpensive and simple power supply.Cheersmadires
How To guide on Pre-compliance testing - Page 1
Forum section: electronics / general

author: SiC
author_rank: Contributor
timestamp: September 02, 2012, 10:00:51 pm
content: Hi Dave,I'm a long time viewer of your channel and I love it! One thing I would love to see however, is a how to guide on pre-compliance EMC testing - especially as now you have a low-cost spectrum analyser.I'm sure there are many hobbyists/entrepreneurs/etc who have designed, built and tested their widget and ready to go to market. But before actually getting to market they have to book expensive lab time to get it EMC certified.Now if we could test our widgets at our own labs, we could know in advance if its got any chance of passing or if a redesign may be required. So when it comes to the actual test day, we can come much better prepared. These new cheap Spectrum Analysers would certainly be cheaper than booking a testing house lab session and failing! Also it would be great to learn set-up and use (and if possible, even how to build) antenna's for the different frequencies used.Doable? Or is this cheap equipment really not good enough to do it?Cheers,Si.

author: jahonen
author_rank: Super Contributor
timestamp: September 03, 2012, 03:07:41 pm
content: I think this thing has been discussed in the past and conclusion is that while one certainly can get a general idea how it will look, but it is much more difficult to say whether DUT will pass limits or not with great confidence. It is really not the measurement equipment (spectrum analyzer) price tag, but a calibration of the setup as whole (i.e. how much of RF input to the analyzer corresponds to a certain field strength seen by the antenna) and the way the measurement is done (in an RF-anechoic chamber). This is because one can only measure nearfields with simple means, while actual test measures more or less farfield. Probably one can learn to have some kind of instinct which will be the case but I afraid that comes only via much practical experience.I think that Dave would have a difficult time to trying to explain all this in reasonable time, although certain quick measurements could be explained with relative ease.Of course, conducted emissions are much better candidate for homebrew measurement, as there is no requirement for calibrated antenna or anechoic chamber. LISN (Line Impedance Stabilization Network) is not a very exotic device, just few carefully constructed coils and capacitors. But there are some caveats which can destroy the analyzer if one is not careful.Regards,Janne
LED downlight internal wiring. - Page 1
Forum section: electronics / general

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 10, 2012, 10:40:11 pm
content: I'm curious, inside the "globe" of a low voltage LED downlight, are the LED dies in series or parallel?I know it is better to put LEDs in series as they all will recieve the same current but as they are all thermally connected, thermal runaway isn't as much of an issue because their temperatures should all be very similar.

author: Short Circuit
author_rank: Frequent Contributor
timestamp: July 10, 2012, 10:57:21 pm
content: LED's cannot be connected parallel because small variations in Vf can cause relative large variations in current and brightness.So each would need at least a resistor, which is a waste of power. Connected in series, only one current control is needed, allowing for a much more efficient lamp.

author: David_AVD
author_rank: Super Contributor
timestamp: July 11, 2012, 12:50:32 am
content: LEDs can be connected in parallel. There are design constraints to be aware of however. You can't just parallel any old LEDs you like.Pure parallel arrangements are not all that common however. The more usual method is several series strings put into parallel.

author: Psi
author_rank: Super Contributor
timestamp: July 11, 2012, 12:55:38 am
content: Quote from: Short Circuit on July 10, 2012, 10:57:21 pmThat doesn't stop companies doing it in cheap products though :|

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 11, 2012, 12:59:41 am
content: You havent really answered my question but more confirmed what i initially thought. Thanks!Also, i just realized i posted this in the wrong forum, can a mod move this for me, i should check better next time.

author: David_AVD
author_rank: Super Contributor
timestamp: July 11, 2012, 01:17:57 am
content: Peter, down lights would almost certainly use a series-parallel arrangement. Something like this:The design in question may or may not have a resistor in each series string.

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 11, 2012, 06:53:42 am
content: Yeah, the ones in particular i was looking at were 3 LED or 5 LED units so they'd probably have the 3 in series, but for the 5 all series is a pretty hefty voltage drop, and splittimg for a series - parallel arrangement would be un-even.I guess i should just get one and test the forward voltage.

author: David_AVD
author_rank: Super Contributor
timestamp: July 11, 2012, 08:54:30 am
content: A low voltage light with several LEDS could even have a boost converter. National (now TI) make some cool driver chips.

author: mux
author_rank: Regular Contributor
timestamp: July 12, 2012, 08:56:41 pm
content: In the ones I tore down recently there was a little 12->80V boost converter with all LEDs in series. Seems like the cheapest option, because you only need one control loop for current regulation, and boost converters are very easy and cheap to make (no need for level translation, just one N-channel FET, low-side current measurement, etc.).
FLUKE 1587 VS MIT430 - Page 1
Forum section: electronics / general

author: crizh
author_rank: Newbie
timestamp: July 02, 2012, 09:55:27 pm
content: please advise which is better? thanks.

author: crizh
author_rank: Newbie
timestamp: July 04, 2012, 07:44:34 pm
content: any one can suggest a better one? because I'm planning to buy insulation resistance for installation and troubleshooting in commercial and industrial wiring's. thank you.

author: Engineer
author_rank: Newbie
timestamp: July 07, 2012, 08:53:48 pm
content: Well not much in it if you compare the specs, only major difference I can see is that the MIT430 would appear to be more ruggedised than the fluke. e.g. it will stand being run over by a transit van (with radio, Sun newspaper and butty box fitted and 3 big weegies (frae Glesga)).So, If you are running about between commercial and industrial sites I'd plonk for the MIT, their ain't any other real contenders at this portable spec level that I can find.
Video tutorial about switching power supplies (using the photocopier board) - Page 1
Forum section: electronics / general

author: opablo
author_rank: Regular Contributor
timestamp: July 10, 2012, 04:56:40 am
content: Dave, don''t you think that the switching power supply board that you got from the photocopier tear down is so well layedout and the components are so well spaced that it would be ideal for a video teaching us about how switching power supplies work ?As with any topic; I know that there''s a lot of info on the net to read from... but nothing compares with one of your teaching videos.It could be difficult to do it on a real switching power supply because it has too many more features...And it could be also difficult to do it on a PC power supply or an external power supply because they are always tightly designed for small footprint...And that board... looks perfect for teaching

author: EEVblog
author_rank: Unknown
timestamp: July 10, 2012, 05:19:35 am
content: Maybe, will have to investigate. It is indeed very nicely laid out for that.Would really help to have the circuit for it. ZSMU298H (K-F01-160-A13)Dave.

author: ivan747
author_rank: Super Contributor
timestamp: July 14, 2012, 01:04:35 am
content: And, if you are going to do it, please teach us how they use opto-isolators in the feedback loop (and what key components they use in each building block), and the layout considerations as well.
weekly live shows - Page 1
Forum section: electronics / general

author: shane_95
author_rank: Regular Contributor
timestamp: July 07, 2012, 11:04:48 am
content: Im thinking dave does a live show every friday night. He could spend the day with the wife and kid go to the office about 6pm go for a few hours then go back home

author: interoth
author_rank: Contributor
timestamp: July 07, 2012, 05:13:24 pm
content: I quite like this idea, could be quite interesting.

author: Spikee
author_rank: Frequent Contributor
timestamp: July 07, 2012, 05:41:57 pm
content: I like it verry much , i keep checking youtube all the time wondering if he has posted an video.

author: SeanB
author_rank: Super Contributor
timestamp: July 07, 2012, 05:52:04 pm
content: Subscribe to the YT channel, then you get an email within minutes of Dave posting.
EEVblog - bloopers - Page 1
Forum section: electronics / general

author: fenclu
author_rank: Regular Contributor
timestamp: July 06, 2012, 07:03:37 am
content: I think it would be quite a neat idea to make a video of some funny bloopers you've made. Assuming of course that you keep that material, Dave.

author: EEVblog
author_rank: Unknown
timestamp: July 06, 2012, 07:22:42 am
content: I keep almost all raw footage.Finding it on the other hand would take more time than I have.I'd have to look through 300+ videos with maybe an average of 40 clips per video, start and end of each clip to find the goofs.And they aren't that funny, sorry, usually just me getting tounge tied because I little idea what I'm going to actually say when I hit record. Or some noise in the background ruining the clipDave.

author: GeoffS
author_rank: Unknown
timestamp: July 06, 2012, 12:02:34 pm
content: You should know by now that Dave never makes mistakes in his videos.Except the one where he pours BEER down the sink! Still getting over that one

author: Simon
author_rank: Unknown
timestamp: July 06, 2012, 12:38:40 pm
content: Which one was that I'll have to go find it

author: GeoffS
author_rank: Unknown
timestamp: July 06, 2012, 01:04:33 pm
content: Here it is.http://www.eevblog.com/2012/05/01/die-hard-beer/Warning! may contain disturbing images!

author: SeanB
author_rank: Super Contributor
timestamp: July 06, 2012, 02:44:32 pm
content: What is wrong with the beer down the sink? It cleans it nicely. I have seen the brewery have a bad day, and pour 30 hectolitres of beer down the drain, as it went wrong somewhere in production. Funny thing is that beer in the bar at the brewery was free, but the barman, Jimmy, would never give you enough to get you drunk.

author: fenclu
author_rank: Regular Contributor
timestamp: July 06, 2012, 04:58:45 pm
content: Yeaah, I guess it's not a great idea after all....