hybridfree/eevblog-posts huggingface dataset:
Minor tweak to BM235 support leg - Page 1
Forum section: electronics / general

author: jim_s
author_rank: Newbie
timestamp: July 20, 2016, 04:06:18 am
content: This is a completely non-technical subject, but I received my BM235, and have thus far been very satisfied with it - great little meter!My one real complaint has been that the support leg, attached to the rubber casing, is floppy - to the point of being almost cheesy. (Sorry, just following the 'No BS' mantra... ;-) Turning the knob while using the support leg results in the leg/case joint flexing terribly, and the meter sort of running away from you as you're trying to change the switch position.A super-low-tech solution that's working well for me is to drill two small holes in the support leg, then thread a short length of monofilament line through the holes, tie it off, then make a loop in the other end, and screw it down under the rear case screw. (ala attached picture)This really stiffens things up, and it feels solid now when using the meter on its support leg. (about 99% of my use) The string is short enough, that when the leg is folded up, the string just stays between the leg and the case, so its not in the way at all.Anyway, not sure if anyone has already done this, but if not, and if you find the leg too floppy, its a 5-minute low-tech fix! (sorry, that's about the extent of my ability to meaningfully contribute to this community... <:-)

author: SeanB
author_rank: Super Contributor
timestamp: July 20, 2016, 07:14:32 am
content: Nice mod there!

author: VK5RC
author_rank: Unknown
timestamp: August 02, 2016, 12:24:13 am
content: +1 Like the mod, pity that it didn't use a zip tie, my favourite 'bodge' weapon. HiHi.
past mailbag item question. - Page 1
Forum section: electronics / general

author: JWoodrell
author_rank: Contributor
timestamp: July 16, 2016, 02:34:50 am
content: I remember seeing an opt in cross strip veroboard sent into the mailbag a while back. I am working on a project which is going to use that concept and I wanted to give credit, but I can't find where I saw it on here.the layout looks like this if that helpsthe top layer lets you solder jump (6 mil gap) any given through hole to an adjoining vertical strip line. and the bottom layer lets you solder jump any given TH to a horizontal strip line.this will eliminate alot of the jumper wires needed for a protoboard layout. It is a cool concept and I want to make sure I can give the guy credit.

author: mairo
author_rank: Unknown
timestamp: July 16, 2016, 09:31:24 pm
content: https://www.kickstarter.com/projects/658903329/perf-the-perfboard-reinvented/descriptionhttp://www.dailytelegraph.com.au/newslocal/north-shore/north-sydney-student-gains-funding-from-around-the-world-for-his-electronic-prototyping-board/news-story/cf426737386892ab37abfc422d100b6dI think this is what you are after, not sure in which video Dave talked about it tho. Will be good to find the video as I remember either him or another boy from Sydney (I think) who made some remote PC resetting 'device' had it patented.
How to Make a Custom Battery charger? - Page 1
Forum section: electronics / general

author: iranianrookie
author_rank: Newbie
timestamp: July 15, 2016, 02:58:25 am
content: hello guys, is there any guidance to make a rare battery charger?i can't find any charger at the stores for my battery that is for a laser beam, the details are:UltraFire (but i think i have a chinese produce because the brand is UitraFlre)AX 123A 1200mAh 3.6Vi found thishttp://www.ebay.in/itm/262258866915?aff_source=Sok-GoogPCB when i googled my question! but i think this is not helpful for any kind of Batteries and i think this PCB not contained the Battery Protection system (that i need this option because i don't want to pay for other batteries), before this topic i used YouTube to understand whats difference between mAh and A , and i found the eevblog posts on youtube and im here now just to ask about my topic.i need some (if possible for you) theory guidance and the some Experimental.i made a AA & AAA battery charger for myself last year when i started highschool but know really i don't know what are this battery materials and i don't know how it works! (like other batteries or not? bcs the 123Ais HUGE!).+(this problem forwarded me to a new topic in my life" :The batteries!, i'm really interested to research about batteries in this summer! please can you help me to find a Full article or book for learning basic to pro step by step about batteries? , if you can please help me)the AX Battery:A:B:my charger:(its old but works well for regular AA and AAA batteries)and my batteries that i found them in my room and i want to know about them, inside, materials, how them work, etc.thank you for reading my question, and sorry if i wrote this topic with bad english grammer.thanks again.

author: ebclr
author_rank: Super Contributor
timestamp: July 15, 2016, 03:38:31 am
content: http://pt.aliexpress.com/item/1PCS-5V-1A-Micro-USB-18650-Lithium-Battery-Charging-Board-Charger-Module-Protection-Dual-Functions/32467578996.html?spm=2114.30010508.8.4.Q12WDT

author: ebclr
author_rank: Super Contributor
timestamp: July 15, 2016, 03:39:35 am
content: http://batteryuniversity.com/learn/article/lithium_based_batteries

author: iranianrookie
author_rank: Newbie
timestamp: July 15, 2016, 11:12:01 am
content: Quote from: ebclr on July 15, 2016, 03:38:31 amThank you but i want to make a circuit for my project, can you help me?

author: ebclr
author_rank: Super Contributor
timestamp: July 16, 2016, 08:27:48 pm
content: Buy the cheap board on aliexpress, add to your project and you are done
What is the microphone Dave uses at his desk? - Page 1
Forum section: electronics / general

author: lumpking69
author_rank: Newbie
timestamp: July 05, 2016, 03:12:32 am
content: I'm talking about this mic....I tried to google it and search the forums, but I haven't found anything.Anyone have any idea?

author: andtfoot
author_rank: Unknown
timestamp: July 05, 2016, 03:23:55 am
content: Looks like a Rode Podcasterhttp://www.rode.com/microphones/podcaster

author: lumpking69
author_rank: Newbie
timestamp: July 05, 2016, 08:00:15 pm
content: That Looks like it! TY
eevBLAB #23 - Interorbital Systems TubeSat vs Australia Post - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: June 08, 2016, 02:00:59 am
content: How much does it cost to launch a Tubesat satellite with Interorbital Systems vs Dave's cost of shipping with Australia Post for just one month?http://www.interorbital.com/interorbital_06222015_002.htmhttp://www.interorbital.com/Downloads/TubeSat%20Sales%20Brochure%20Publish%202.0.pdf

author: imidis
author_rank: Frequent Contributor
timestamp: June 20, 2016, 10:14:06 pm
content: Well, that is a bit of shipping.

author: apis
author_rank: Super Contributor
timestamp: July 06, 2016, 08:00:16 pm
content: Lucky I don't have $8000 to waste on my own vanity satellite.
EEVblog #885 - Audi Quattro Lunar Rover Unboxing! - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: May 30, 2016, 02:04:51 pm
content: World's first unboxing of a lunar rover!The Audi Lunar Quattro moon rover, which is an entry in the Google Lunar X-prize. Scheduled for launch in 2017.Developed by PT Scientists.With the head of electronics development, Karsten Becker.More videos coming...http://lunar.xprize.org/teams/part-time-scientistshttp://www.mission-to-the-moon.com/

author: r4ptor
author_rank: Contributor
timestamp: May 30, 2016, 02:59:26 pm
content: Ah the part time scientists. I met them on the28c3in Berlin in 2011(very fiendly and cool germans). They did a very impressive lecture on this thing and the project itself.Still have a Tshirt of the guysHere are two pictures of the rover in 2011. Changed a little bit sry for the image quality, crappy iphone.

author: G7PSK
author_rank: Super Contributor
timestamp: May 30, 2016, 08:36:09 pm
content: Sagan now has some very serious bragging rights at school, He drove a moon rover. Not many kids can say that. Well done Sagan

author: AF6LJ
author_rank: Unknown
timestamp: May 30, 2016, 08:57:33 pm
content: Quote from: G7PSK on May 30, 2016, 08:36:09 pmIndeed he does. That's Cool.

author: rrinker
author_rank: Super Contributor
timestamp: May 30, 2016, 09:11:36 pm
content: He's got bragging rights ANYWHERE. How many ADULTS can say they've driven a lunar rover?

author: imidis
author_rank: Frequent Contributor
timestamp: May 31, 2016, 02:05:37 am
content: Awww, was hoping for a tear down.

author: tautech
author_rank: Super Contributor
timestamp: May 31, 2016, 02:52:29 am
content: Aw Dave.....never seen you do an unboxing without your Dundee knife.Thanks for sharing.

author: bryanrj1
author_rank: Contributor
timestamp: May 31, 2016, 10:10:42 am
content: This would look great inside the Shermer High School shop class.

author: Halcyon
author_rank: Unknown
timestamp: June 01, 2016, 03:30:48 am
content: The guy sitting under the projector screen in r4ptor's photo kind of looks like Sergeant Schultz.

author: Orpheus
author_rank: Regular Contributor
timestamp: June 01, 2016, 11:58:56 am
content: Dear Karsten,If you have a moment, do you think you could print off an extra copy for us to tweak for Mars in 2018, just in case?Thanks, bud! You're the best!-- elon

author: KoF
author_rank: Contributor
timestamp: June 01, 2016, 03:55:16 pm
content: If you want to see some more german robots you should visit the DFKI-RIC in Bremen (German Research Center for Artificial Intelligence - Robotics Innovation Center).Robot systems:http://robotik.dfki-bremen.de/en/research/robot-systems.htmlWiki:https://en.wikipedia.org/wiki/German_Research_Centre_for_Artificial_IntelligenceBy the way, there is an open house presentation @ 14. Jun
Latest Video Still Shown As #902 Solar Route 66 - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: July 24, 2016, 01:44:00 pm
content: My EEV Blog front page is not updating and I still see Route 66 as the latest video with 903, #904 and #905 listed as 'Previous'I've tried flushing the cache but this has no effect. Is there a Gremlin somewhere?

author: Brumby
author_rank: Unknown
timestamp: July 24, 2016, 03:17:56 pm
content: I think it lies in the same kernel that drives DaveCad....
Security PLC teardown - Page 1
Forum section: electronics / general

author: Gonzy78
author_rank: Contributor
timestamp: May 18, 2016, 06:27:00 pm
content: Hello,I wonder Dave, if maybe you can find a rockwell PLC or an other security PLC for a teardown.I wonder how they do their stuffThat would be awesomeThank you for all that good stuff you made for us
Recording environmental data of a package in transit - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: May 09, 2016, 03:58:09 pm
content: I've always wondered what a package/mail "gets up to" when it's sent through the postal system, especially long distances. For example, what would data such as temperature, humidity, G-forces, orientation, altitude and speed show? It'd be interesting to be able to see where a package goes once it leaves the post office (granted that a lot of the time a GPS fix probably isn't possible) and the enviromental factors that it's exposed to.Has anyone ever conducted such an experiment?EDIT: Sorry, idiot me posted this in the wrong section. Can it be moved to the 'General' section.

author: stmdude
author_rank: Frequent Contributor
timestamp: May 09, 2016, 04:04:32 pm
content: Plenty of people have.ASTM D4169-01, ISO 13355-2003 and MIL-STD-810-G document shipping vibration, temperatures, humidity, shocks, etc pretty well.Our company uses ISO 13355-2003 as a benchmark to test our products resilience to shipping and such. Parts have been known to resonate at frequencies that can be found on lorries for example.

author: SeanB
author_rank: Super Contributor
timestamp: May 09, 2016, 05:31:41 pm
content: Well, you get tags that are credit card size, and which record temperature and humidity in transit, saving it all to an internal memory. Not too bad price wise ( unless you are paying in ZAR of course) and they are reusable, though the internal battery on them is non replaceable, lasting around 5 years.

author: Fungus
author_rank: Super Contributor
timestamp: May 09, 2016, 06:00:03 pm
content: Those Maxim iButtons are designed for this:https://www.maximintegrated.com/en/products/comms/ibutton.htmlNot exactly cheap though. I'm sure there's alternatives.Edit: Well, OK, not GPS position...

author: station240
author_rank: Unknown
timestamp: May 17, 2016, 06:47:57 pm
content: You can also get Gshock stickers and tilt detect stick on mechanical devices.
Teardown Texas Ti-89 ? - Page 1
Forum section: electronics / general

author: Gonzy78
author_rank: Contributor
timestamp: April 29, 2016, 06:19:22 am
content: Hello,I am a French electronic engineer & I started my student education with the amazing Ti-89 tool. And still using it. I believe I will use it for a lonnnng time ...I am looking for a deep close teardown of that monster. If you have any Dave, it would be nice.They aren't solding that usefull monster. For an engineer that's really usefull ;- Powerfull Solver- engineering display- formal calculator- Nice touch buttons& some other usefull stuff.I use it really evrydays and it's no more produced.I got the new cas Fx one. But- Slower- Buttons harder to push !!! if you want be fast really difficult.- more formal and advanced matrix (nice) but less engineering evryday usefull.So I sold that crap.I bought in my life, more than 3 Ti-89. I think I will keep that tool until I get old.But I wonder, what if someday they aren't anymore to buy one ebay or ...What if I want improve mine, or rebuild one ?We can easily found the Rom of that product. But Schematics ( That could be really interesting for learning some electronics tips maybe ), I can't found anywhere. Is that possible to find them for a non-commercial use ?Or maybe could you help us to retro-engineer that wonderfull box of science ?Thank you by advance.

author: meeder
author_rank: Regular Contributor
timestamp: April 29, 2016, 06:24:15 am
content: You can still buy them today. The TI-89 Titanium is still available, the case is a bit different and it has more flash memory like the Voyage 200.

author: Kilrah
author_rank: Unknown
timestamp: April 29, 2016, 07:29:29 am
content: Watch a teardown of a mid-90s PDA and you'll see about the same architecture.

author: meeder
author_rank: Regular Contributor
timestamp: April 29, 2016, 08:42:29 am
content: Here is some useful information for you:http://datamath.org/Graphing/TI-89.htm

author: Fungus
author_rank: Super Contributor
timestamp: April 29, 2016, 09:08:05 am
content: Quote from: meeder on April 29, 2016, 06:24:15 amI sold mine on eBay last month. Mint condition, hardly used at all. There's still demand for them.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 30, 2016, 05:33:21 am
content: I did a teardown many years ago.https://www.eevblog.com/forum/reviews/teardown-ti-89-titanium/Pretty dated technology even back then, but it is good as a general purpose calculator, albeit quite overpriced. I would like to see an open hardware calculator with an Eink type display, physical buttons (optionally touchscreen as well), and a reasonably fast (100MHz or more) ARM CPU.
Tear down of the ATL HDI3000 Ultrasound Machine? - Page 1
Forum section: electronics / general

author: elliottveares
author_rank: Contributor
timestamp: April 20, 2016, 11:25:42 pm
content: Dave, are we ever going to get the tear down of the ATL HDI3000 Ultrasound Machine that You have?That is of course if you still have it.For those who are out the loop:Regards: Elliott

author: aargee
author_rank: Frequent Contributor
timestamp: April 27, 2016, 05:07:49 am
content: I can do the commentary, I used to service them.

author: Towger
author_rank: Super Contributor
timestamp: April 27, 2016, 05:24:14 am
content: Hold your horses, Dave has plenty of other projects on the queue. The quad copter, the C5, the analyser with all the blown opamps etc etc
Visiting Dave's lab - Page 1
Forum section: electronics / general

author: daniel123
author_rank: Regular Contributor
timestamp: April 25, 2016, 09:24:12 pm
content: I was wondering if I am allowed to visit Dave's lab if I visit Australia. Is this generally ok with Dave because I dnot know if it is and since he moved into the new lab does he still let people into his lab.ThanksDaniel Vrolijk

author: Skimask
author_rank: Super Contributor
timestamp: April 25, 2016, 09:57:01 pm
content: Settle down there genius...Take a pill and relax for a day or five.If you are really an EEVBLOG fan, you'd already know the answer to that...and every one of your other hastily posted questions.

author: Aodhan145
author_rank: Frequent Contributor
timestamp: April 25, 2016, 10:07:49 pm
content: Quote from: Skimask on April 25, 2016, 09:57:01 pmlol
Supporters Forum Access - Page 1
Forum section: electronics / general

author: DykesC
author_rank: Unknown
timestamp: April 26, 2016, 12:17:03 am
content: Became a supporter a few days ago. Sent Dave email. Typically how long to gain access to supporters forum?

author: retrolefty
author_rank: Super Contributor
timestamp: April 26, 2016, 12:52:29 am
content: I bet they even have a secret handshake.

author: linux-works
author_rank: Super Contributor
timestamp: April 26, 2016, 12:56:14 am
content: that's the masons. or the illuminati.(ok, its both.)fnord

author: sleemanj
author_rank: Super Contributor
timestamp: April 26, 2016, 01:08:35 am
content: Quote from: wilfred on April 26, 2016, 12:48:43 amThe first rule of....

author: Muttley Snickers
author_rank: Unknown
timestamp: April 26, 2016, 01:45:48 am
content: Did you fill out the form ?.

author: Brumby
author_rank: Unknown
timestamp: April 26, 2016, 01:51:04 am
content: That form isSECRET!That's going to earn you a*secret*administered by*secret*as punishment at the next meeting up at*secret*on*secret*.

author: DykesC
author_rank: Unknown
timestamp: April 26, 2016, 02:32:12 am
content: I humbly retract my query and have imposed a self penance of sorting 200 resistors.

author: Brumby
author_rank: Unknown
timestamp: April 26, 2016, 02:49:46 am
content: Quote from: DykesC on April 26, 2016, 02:32:12 am.... under a red light!

author: rrinker
author_rank: Super Contributor
timestamp: April 26, 2016, 11:58:34 am
content: He didn't say his name was Roxanne...
502 - Bad Gateway from the Forums link - Page 1
Forum section: electronics / general

author: wblock
author_rank: Regular Contributor
timestamp: April 20, 2016, 04:40:37 pm
content: Since a couple of days before the dumpster scope giveaway, thehttps://www.eevblog.com/forum/link at the top of the main page has been returning 502 - Bad Gateway. It says that people know about it, but it's hard to tell.https://www.eevblog.com/forum/index.phpworks.I would have posted this to an Admin contact, but could not find one.

author: stmdude
author_rank: Frequent Contributor
timestamp: April 20, 2016, 04:47:50 pm
content: Works here.Maybe an ISP specific issue?

author: wblock
author_rank: Regular Contributor
timestamp: April 20, 2016, 04:53:34 pm
content: Quote from: stmdude on April 20, 2016, 04:47:50 pmPossibly, although it used to work. I'll try it elsewhere.

author: wblock
author_rank: Regular Contributor
timestamp: April 20, 2016, 05:10:41 pm
content: Well, that's weird. Worked on other systems, other browsers, even the same browser (Firefox) on other systems.Turning extensions off finally showed that it was Ghostery that was the problem, which mysteriously fixed itself when Ghostery was turned back on. Might be time to jettison that one.

author: Fungus
author_rank: Super Contributor
timestamp: April 20, 2016, 09:01:53 pm
content: Hold shift key and refresh the page...(or clear your browser cache)
RSS feed from Youtube? - Page 1
Forum section: electronics / general

author: rfdave#gmail.com
author_rank: Contributor
timestamp: April 19, 2016, 11:48:31 pm
content: I used to be able to use my RSS reader on my phone to download episodes of the EEVBlog, but for the past month or so, the downloading has failed, for no apparent reason. Does anyone have any suggestions on how to get this working again?ThanksDave

author: Len
author_rank: Frequent Contributor
timestamp: April 20, 2016, 12:28:17 am
content: It works fine for me. Try going to the EEVBlog Youtube channel page and adding the RSS feed published by that page, if that doesn't work it's a problem with your RSS reader.
Recent Livestream - Page 1
Forum section: electronics / general

author: warchild
author_rank: Newbie
timestamp: April 17, 2016, 05:52:18 am
content: You mentioned in the livestream that the "flux-gate condenser" tee shirt could still be bought if enough people asked for it. When you link to the tee shirt site it says "Out of Stock", No "I still want it option". Can you check with them on that? Given the mention in the livestream some people (like myself) may want to purchase it. I am also interested in the Engineering/Religion tee shirt - is that still available?Cheers

author: EEVblog
author_rank: Unknown
timestamp: April 17, 2016, 06:40:58 am
content: I don't know why it says out of stock. Perhaps they are out of stock of that blank shirt type. I have no control over that.All campaign should automatically allow reordering.
EEVBlog #279 why is there audio distortion when alligator probe touches Arduino - Page 1
Forum section: electronics / general

author: sisal
author_rank: Newbie
timestamp: April 26, 2016, 03:30:55 pm
content: HiI just watched #279 - How not to blow up your oscilloscope, and noticed an audio distortion whenever Dave touches the floatiung Arduino:https://youtu.be/xaELqAo4kkQ?t=1191Why is there an audible audio distortion in an unconnected system?- Andy

author: Brumby
author_rank: Unknown
timestamp: April 27, 2016, 01:43:26 am
content: I take it you mean the faint clicking in the background when the connection is made. You might notice there is a green LED on the scope that blinks at the same time.It's not actuallycompletelyisolated. There will be capacitive coupling through the plugpack to the low voltage side. Connecting the ground lead completes a circuit.
EEVblog #867 - The search for the first TTL chip - Page 1
Forum section: electronics / general

author: Macbeth
author_rank: Super Contributor
timestamp: April 08, 2016, 11:14:15 pm
content: Is it just me, or is this episode not available from the EEVBlog front page?For what it's worth I do like the idea of "Wayback Wednesday". I will also say that often the adverts in old magazines and newspapers are often far more interesting than the actual articles within!

author: aries1470
author_rank: Regular Contributor
timestamp: April 10, 2016, 09:20:00 am
content: Quote from: Macbeth on April 08, 2016, 11:14:15 pmNot sure about the front page, as I seen the episode in my feed.IEMPHATICALLY AND CATAGORICALLY CONCUR WITH YOU ON THE "WAYBACK WEDNESDAY".Personaly, me too, I find them very informative, just something about them, conveying their message better, maybe because I grew up in that era?Who knows.Maybe we should do a petition / poll for "Wayback Wednesday", and we can have a voting of what we would like to see presented. Until now, there have been a few tear downs of old computers etc, but what about, creating projects from the old magazines with modern equivalant parts for example? A retro build with modern equivalent transistors, diodes (Germanium anyone?), IC's etc, not µC... That's my 2¢ anyway.
EEVblog #571 - Sennheiser G3 Wireless - Modding the antenna.. EE opinion wanted - Page 1
Forum section: electronics / general

author: dhanson
author_rank: Newbie
timestamp: March 30, 2016, 06:55:32 pm
content: Great teardown on the Sennheiser G3!!Wanted to bring up the topic of modding these by removing the stock whip antenna and retrofitting with a 50-Ohm SMA coaxial bulkhead connector. This would allow you to use a better antenna like a dipole or high gain antenna like an LPDA paddle antenna.Some folks have done it and claim that it works well: (see the following)http://jwsoundgroup.net/index.php?/topic/19338-external-antenna-for-sennheiser-g2/&page=3#comment-313661My question: are there any electrical implications of this that are not being considered? Altering the impedance or introducing RF signal attenuation or something? Altering the ground plane of the stock design, etc?I'm not an EE, just a location sound recordist, and I'm not sure who can answer these questions. Something tells me Sennheiser won't want to weigh in!Thanks!Derek

author: The Soulman
author_rank: Super Contributor
timestamp: April 04, 2016, 07:00:49 pm
content: Not a real EE neither but a live sound engineer and frequent sennheiser EW G3 user.Have experimented with different receiver antenna setups and came with different recipes for different situations, all with standardsennheiser stuff.Never did feel the need to mess with the SK transmitter antenna's as the system, when properly set up, functions flawlessly.The reception on the small camera mount receiver (EK?) is pretty poor with its one antenna thingy, bear in mind it's designed for long battery life and small distance use (reporters etc.).What equipment are you using and under what circumstances?

author: sisal
author_rank: Newbie
timestamp: April 09, 2016, 11:13:17 am
content: I'm at home in both worlds, and the requirements for the gear differ substantially.On a stage for live sound you would have wireless mics and individual in-ear monitoring for each band member. With 4 mics, 6 in-ears, you are quickly up to 7-8 rack space units with receivers, transmitters and antenna distributors/concentrators. You would typically deploy an LPDA and a helical antenna for the vocals (because you know, vocals don't pay attention to polarization), and either another LPDA, a basic dipole or another helix for the in-ears.In location sound, your 8 rack units need to fit in a little bag that you carry along the whole day. Thats where you shrink it down to have 1 transmitter that feeds boom-op, camera, AD etc. Thats where use those little receivers, and having external antennas (or at least proper whips for that matter) is a big plus - eventually that's why the more expensive receivers in this form factor all come with SMA plugs and not built in whips.

author: dhanson
author_rank: Newbie
timestamp: April 09, 2016, 11:55:09 am
content: Yup, exactly.
Suggestion: heat transfer but starting from datasheet.. - Page 1
Forum section: electronics / general

author: MJU
author_rank: Newbie
timestamp: April 03, 2016, 11:00:10 pm
content: I found several episodes of Dave explaining heat sinks and the math around them.But I never found an episode thats starts from the datasheet back to the heat sink.Example: the Sharp SSR S216S02. How do I interpret the data on the datasheet so I can end with a heat sink.So this is more about how to read the different charts and data on a datasheet.Dave if you are out there....

author: Brumby
author_rank: Unknown
timestamp: April 04, 2016, 02:21:55 am
content: Has Dave done anything like this that covers the whole range?If not - here's a suggested title: "From Silicon to Surrounds - a thermal journey"It could cover heat generation; component density; frequency of operation through to the obvious thermal resistances and cooling methods. (If he wanted to get really radical, he could reveal the secrets behind the magic smoke!)

author: MJU
author_rank: Newbie
timestamp: April 04, 2016, 02:16:39 pm
content: Quote from: Brumby on April 04, 2016, 02:21:55 amThat seems a good suggestion (and title).But general guidelines for how to find the necessary data on a datasheet from which we can calculate the heat sink from, would be great.Someone suggested that electronics works on smoke.. When the smoke gets out, the device is broke..

author: Brumby
author_rank: Unknown
timestamp: April 04, 2016, 02:22:35 pm
content: Quote from: MJU on April 04, 2016, 02:16:39 pmIt's not a suggestion - it's a well documented fact and one that most (if not all) of us here can personally attest to.

author: rrinker
author_rank: Super Contributor
timestamp: April 05, 2016, 12:50:59 am
content: Absolutely. There's this misconception that the development of semiconductor junctions spurred a revolution in electronics, but that's just not true. All the semiconductors do it increase the efficiency of Magic Smoke, which is the real working element in all types of components. By some 800%, actually. This enabled a much smaller device to do the same job as the older, bigger ones. As the purity of the semiconductor crystals improved, and the materials changed to even better ones, the efficiency continued to go up, so less and less volume of Magic Smoke was required to get the job done. Think about it, when some old component fails, there is copious amounts of Magic Smoke released, sometimes even flame. But blow a modern IC, and you get maybe a little divot blown out of the package where the Magic Smoke was concentrated and sometimes you don't even see the smoke as it escapes, there's such a tiny quantity.

author: MJU
author_rank: Newbie
timestamp: April 05, 2016, 10:11:48 pm
content: Quote from: rrinker on April 05, 2016, 12:50:59 amThis is sure true!I just thought that my eyes were getting worse...But before the smoke appears we could engineer this not to happen.Maybe Dave can explain (fundamental Friday?), how we can find all the data in a datasheet to calculate the heat sink? O0
EEVblog #110 - Let's Design a DC to DC Switchmode Converter - Page 1
Forum section: electronics / general

author: JonnyJacksonX
author_rank: Newbie
timestamp: March 26, 2016, 03:42:38 pm
content: Hello.I'm new to electronics and I need to make a step down circuit.I want to design a bike led lamp feed by 3 18650 li ion battery, so 11.1V Vin.Then I need to step down the voltage with a buck converter, as a linear converter seems to be really inefficient.I find the #110 video from eevblog about the venerable MC34063.For calculating the values of the in and out parts, like inductors, resistors, capacitor... I need use the frequency as a variable.But, here is the issue, what is the frequency to use with a battery? Aren't the voltage a constant? The frequency is 0 (I know it's not)?Thanks for answering my noob question. And sorry for the bad english.

author: Simon
author_rank: Unknown
timestamp: March 26, 2016, 04:05:51 pm
content: You have to pick a frequency you want to use, that is the frequency the chip will oscillate at. This comes with the knwledge that the higher the frequency the less efficient it may be but the smaller the parts. Just go for a ballpark 40KHz to get you going.

author: JonnyJacksonX
author_rank: Newbie
timestamp: March 26, 2016, 04:44:25 pm
content: well.I didn't understanded that the frequency was about the IC, not the source of power. So I will use 40 kHz.So thank you Simon for your rapid answer.

author: ghulands
author_rank: Contributor
timestamp: April 03, 2016, 12:41:00 am
content: Quote from: JonnyJacksonX on March 26, 2016, 04:44:25 pmThe 3 18650's are a DC source so they don't oscillate - frequency of 0. I found afrotech's video on converters helpful in understanding their operation.
Live stream test this evening - Page 1
Forum section: electronics / general

author: Kernel
author_rank: Contributor
timestamp: April 06, 2016, 09:23:27 am
content: A little under an hour ago this evening (now is 7:21PM AEST) I saw a notification on my iPad that there was a live stream on the Eevblog Youtube channel just called EEVblog - "LIve Test" (sic).Dave is planning an upcoming live stream using youtube?

author: MarvinTheMartian
author_rank: Frequent Contributor
timestamp: April 06, 2016, 09:41:06 am
content: Quote from: Kernel on April 06, 2016, 09:23:27 amSounds like Dave is getting ready to find a new home for that old, customized, used scope of his.We will all be watching with bated breath!

author: EEVblog
author_rank: Unknown
timestamp: April 06, 2016, 11:48:06 am
content: I went for an hour and about 500 people showed up. Simulcast on Ustream too.

author: MarvinTheMartian
author_rank: Frequent Contributor
timestamp: April 06, 2016, 12:10:33 pm
content: Quote from: EEVblog on April 06, 2016, 11:48:06 amAlmost everyone in the running?I don't have a YT/Google account so I won't be able to watch it live.Will have to find out the result after the event (when I get the PM saying I've been selected?)Then again, I may be just an interested bystander!

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: April 06, 2016, 12:36:29 pm
content: Quote from: EEVblog on April 06, 2016, 11:48:06 amWas completely unwatchable though. 90% of the time was buffering.

author: Svuppe
author_rank: Regular Contributor
timestamp: April 06, 2016, 12:47:59 pm
content: Quote from: RGB255_0_0 on April 06, 2016, 12:36:29 pmWorked fine on my phone when I had a look.

author: lapm
author_rank: Frequent Contributor
timestamp: April 06, 2016, 02:58:19 pm
content: Stream from youtube was fine on my mobile phone in less then optimal field.. Was able to watch it at work on my brake

author: Kernel
author_rank: Contributor
timestamp: April 06, 2016, 11:34:06 pm
content: Quote from: EEVblog on April 06, 2016, 11:48:06 amAs you can see from my screenshots I was unable to access the stream.
eevblog server down... - Page 1
Forum section: electronics / general

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 12, 2016, 11:22:47 pm
content: few days i got 2 occasions of "server cant be reached". and now eevblog content starting page2 and on are inaccesible. watch out..

author: mojoe
author_rank: Frequent Contributor
timestamp: February 13, 2016, 05:13:38 am
content: Me, too. May have something to do with that submerged cable to Austrailia that was cut recently.

author: EEVblog
author_rank: Unknown
timestamp: February 13, 2016, 06:48:24 am
content: Quote from: mojoe on February 13, 2016, 05:13:38 amNope, the server is in Texas.

author: orion242
author_rank: Unknown
timestamp: February 13, 2016, 06:55:26 am
content: Quote from: EEVblog on February 13, 2016, 06:48:24 amWell it must be massive. Everything is bigger in TX

author: Brumby
author_rank: Unknown
timestamp: February 13, 2016, 08:33:10 am
content: ... even the problems?

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 13, 2016, 10:39:32 am
content: Quote from: Brumby on February 13, 2016, 08:33:10 am

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 22, 2016, 04:47:48 pm
content: the saviour of the day...https://www.eevblog.com/forum/blog/shop-page-malfunctioning-on-chrome/msg873515/#msg873515i'm converting to firefox now, so i can crank the last bits of the XP's life..
Dave's EEVblog #577 Precision 1 A Current Source - Page 1
Forum section: electronics / general

author: XpLanR4mI
author_rank: Newbie
timestamp: June 22, 2015, 03:32:13 am
content: I'm looking to build a 1 amp current reference Source to be used to calibrate a Data Acq. system. I like the #577 blog, but would like to know if someone might know of an alternate to the Vishay 4-terminal VPR221ZT 1R2500 0.02% current sense resistor, not Vishay, or an alternate circuit which might offer similar specs. The input impedance for the Current transformer is 1M and has 0.1% accuracy so I want to maximize it's capability.Thanks

author: zlymex
author_rank: Frequent Contributor
timestamp: March 08, 2016, 11:10:30 am
content: Sorry to bring this up, I thought it might be a common interest on how to choose a current sensing resistor of 1A or above.Firstly, I have made an ultra-stable 1A current source prior to Dave's video, using similar Vishay precision shunt(Vishay VHP4 0.1 Ohm). I achieve this sub-ppm short term stability also by lowering the shunt resistance, low noise opamp and especially heat management combined.Secondly, lower the sensing voltage from 1.25V to 0.2V/0.25V will increase the stability significantly. the voltage reference needed can be divided from a 1.25V or 2.5V Vref. Thus, an 0.2 Ohm or 0.25 Ohm resistor is required for 1A current source. For 2A or 10A current sensing, the voltage can be further reduced to 0.1V.Thirdly, make a large heatsink for the sensing resistor. I often use the aluminium case for the heatsink.Fourthly, move the power MOS(probably the most heat generator) outside the case like I did. Also the power supply could be a separate unit. Mine is battery powered.And lastly, some none-Vishay sense resistors1. Alpha Electronics, they make very good shunt resistors widely used among Japaneses instruments.2. Isabell**, famous for precision shunt, their PBV is nice for current sampling.3. Dale resistors, 2 wire, if the requirement is not very tight4. Use parallel. ex 20 foil resistors of 5 Ohm, similar to Fluke A40B, where they use 960 foil resistors to measure 100A current.
Shop page malfunctioning on Chrome - Page 1
Forum section: electronics / general

author: ciccio
author_rank: Frequent Contributor
timestamp: February 19, 2016, 12:12:55 pm
content: Don't know if this is the correct place to signal the site's problems, but when I click on the STORE tab the page opens (with a strange graphics) but any link I click does not work, giving a "page not found" error with this phrase "ERR_SSL_VERSION_OR_CIPHER_MISMATCH".This happens with Google Chrome.I've looked at the details:"You can not connect securely because the site uses an encryption package or an unsupported protocol. Probably the problem occurs when the server needs to RC4, which is no longer considered safe ".With Firefox everything seems correct.Best regards

author: EEVblog
author_rank: Unknown
timestamp: February 19, 2016, 12:15:53 pm
content: Fine one chrome for me.

author: ciccio
author_rank: Frequent Contributor
timestamp: February 19, 2016, 12:17:34 pm
content: I've edited my post. Chrome explains the reason. It seems it has to do with RC4 encryption.

author: ornea
author_rank: Unknown
timestamp: February 19, 2016, 12:36:36 pm
content: I have similar issues using Chrome on XP @www.eevblog.comon 3 different PC

author: ciccio
author_rank: Frequent Contributor
timestamp: February 19, 2016, 01:37:55 pm
content: Quote from: ornea on February 19, 2016, 12:36:36 pmI'm too on XP. Must check other operating systems..

author: wilhelm
author_rank: Contributor
timestamp: February 19, 2016, 04:11:31 pm
content: If you get chiper error on XP you have to use firefox. It has it's own ssl software to handle that. Other browsers rely on the OS to supply support for that. XP no longer get newer versions for ssl crypto
EEVblog Announcements - Page 1
Forum section: electronics / general

author: The_PCB_Guy
author_rank: Regular Contributor
timestamp: February 16, 2016, 12:36:34 am
content: Hi all,My apologies if this has been answered elsewhere, or if this is the wrong place, but where can I get a shirt like the one Dave is wearing in his latest Announcements video?I love it, it's just too perfect to pass up!Thanks folks,Matt

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 16, 2016, 12:46:05 am
content: https://teespring.com/autorouter, but I doubt it's available anymore...Here's a similar shirt (no affiliation):https://www.spreadshirt.com.au/never-trust-the-autorouter-A103099150

author: The_PCB_Guy
author_rank: Regular Contributor
timestamp: February 16, 2016, 01:09:36 am
content: Thank you very much! I would much rather support Dave, but it's good to know. Maybe he'd be willing to reopen it....Much appreciated!

author: ECEdesign
author_rank: Regular Contributor
timestamp: February 16, 2016, 01:28:42 am
content: I was just going to ask this question... Cool shirt!

author: EEVblog
author_rank: Unknown
timestamp: February 16, 2016, 03:18:00 am
content: It is not my shirt, it is Chirs Gammell's

author: The_PCB_Guy
author_rank: Regular Contributor
timestamp: February 17, 2016, 11:31:06 pm
content: Quote from: EEVblog on February 16, 2016, 03:18:00 amOh darnI'm going to have to get me one of those anyway!
world's simplest soft latching power switch circuit - Page 1
Forum section: electronics / general

author: rockstar
author_rank: Newbie
timestamp: June 30, 2015, 12:15:52 pm
content: The finished circuit as per blog262 with a single switch that latches and toggles: it works well at 12v on breadboard and when soldered up. BUT it has output when powered up.How can I modify circuit so that it is naturally off when powered up, then has output when button first pushed?? I've tried lots of things and it does what I want if there is a resistor between battery positive and 'power in' PLUS power up the gate to the mosfet prior to powering the rest of circuit. Trouble is I want 12v out so need to put 12v in, not add resistor. I am happy to power the gate first as will be using in my car so can have gate permanently powered and rest of circuit powered when ignition on. Maybe I need a different mosfet or different resistor values?Used mosfet TP0604N3-G (-40V;-2A;740mW;T092;channel enhanced) 2x transistor 2n3904, resistors as suggested inc 10k on load parallel to out

author: 4JimBeam
author_rank: Newbie
timestamp: February 15, 2016, 11:09:09 am
content: Hi All,I have the same issue, that the output is high first time I power up the ciruit.So I have the following questions:1.) Why is it so?2.) What can I do to have it stay OFF when powerd 1.st time?3.) Additional I would like to have a soft-start (inrush current limited), what do I need to change?My own guesses:to 1.) The P-Mos is inital at least a bit on, so that the bi-polar transitor at the gate of P-MOS pulls the gate faster down to GND than the 100k between gate-sorce can pull the gate up.to 2.) A) Bypass 100k gate-sorce with a 100nF cap to have an pulse current to carge up the gate faster? B) add a cap at the base of that bipolar transitor that pulls the gate down, to slow this lathcing down?to 3.) add some extra gate-sorce cap to the Mosfet to make it slower on (and off)?Thank's for your help and advice!
Trying to find a video - Page 1
Forum section: electronics / general

author: Oj0
author_rank: Newbie
timestamp: January 21, 2016, 10:51:38 pm
content: Hi guys, I'm a long time channel subscriber but new to the forumsI'm trying to find a video Dave posted some time back, but I'm very vague on the specifics. I think it was a teardown video (Dave definitely opened the unit), probably of an oscilloscope, which MAY have been an HP. I think it was an older unit, as it was absolutely crammed with PCBs - almost (if not) one for each plane. That's about all I can rememberAny help finding the video would be appreciated!

author: EEVblog
author_rank: Unknown
timestamp: January 21, 2016, 10:55:53 pm
content: Searching "eevblog hp oscilloscope":This one maybe?

author: Oj0
author_rank: Newbie
timestamp: January 21, 2016, 11:02:31 pm
content: Woohoo, a reply from the man himselfI've done some extensive searching but can't find it, the video you linked is one I came across but there aren't enough PCBs and it's too messy. I *think* the one in question had very tidy PCBs on the bottom, left and right sides. I may be horribly wrong about it being an oscilloscope or even HP, I saw it a few months back when I was doing some SERIOUS catching up and watching 2-3 hours of your videos each day.

author: rich
author_rank: Frequent Contributor
timestamp: January 21, 2016, 11:28:01 pm
content: The more details no matter how small could help us...Roughly how old did the technology look - was it through-hole, surface mount or a mix of both?I'd have guessed "EEVblog #790 – Lecroy Wavejet 354 Touch Oscilloscope Teardown" as that thing reminded me of a cubesat when I saw it, which might fit with your one pcb per plane (assuming you meant 3D plane)?http://www.eevblog.com/2015/09/02/eevblog-790-lecroy-wavejet-354-touch-oscilloscope-teardown/

author: drussell
author_rank: Super Contributor
timestamp: January 22, 2016, 03:27:40 am
content: I was thinking maybe the HP 35670A Dynamic Signal Analyser that has all the frazzed op amps...Dave, I take it you still have never gone back and tried to fix that puppy?I'll bet it can be fixed with a full-on op-amp replacement campaign on that board... lolOr perhaps the HP 1740A if it really was a scope... Not that many boards, though, but a few.

author: rsjsouza
author_rank: Super Contributor
timestamp: January 22, 2016, 03:41:41 am
content: In addition to drussell's suggestions, perhaps the LeCroy 9384C?
EEV Blog logo - Page 1
Forum section: electronics / general

author: eamoex
author_rank: Contributor
timestamp: January 25, 2016, 12:24:33 pm
content: Hi All, hi Dave,been watching the video blog for some time now, love your work! I'm not an electronics guy, my trade is graphic design, but I think the blog is great even for ignorants like me.So, I've been meaning to contribute lately, and maybe some day my parcel will be featured in a mail bag segment. In the meantime, here's a logo for the blog.Please note: I hate free stuff. Free stuff is bu**sh*t. Nothing is free. Ever. It's a lie. It's a curse. And so, I never work for free. But, you know, I thought I could make an exception for the great EEV Blog!Cheers!

author: Simon
author_rank: Unknown
timestamp: January 25, 2016, 12:55:03 pm
content: I like the conceptual design. I think Dave has a sort of logo. Not sure if he wants to change.

author: eamoex
author_rank: Contributor
timestamp: January 25, 2016, 01:03:46 pm
content: Why, thanks!Yeah, I heard him say he didn't even want one, the blog's "off-the-cuff", etc... which I totally understand and find cool. But "if all you have is a hammer, everything looks like a nail", and so as a graphic designer I tend to solve problems by designing logos. Rarely ever efficient, as you might guess.

author: EEVblog
author_rank: Unknown
timestamp: January 25, 2016, 01:34:28 pm
content: We went through the whole logo thing many years back and held a contest and it just didn't really work our. The name "EEVblog" is enough, and the "Dave Hand" is as close as it gets to a "logo", and the EEVblog name has a semi-official font and look people are used to.People have always associated me with a name, not a logo.

author: eamoex
author_rank: Contributor
timestamp: January 25, 2016, 01:36:41 pm
content: TEN-FOUR, Dave!

author: eamoex
author_rank: Contributor
timestamp: January 25, 2016, 01:44:56 pm
content: What if I laser-cut it?Just pulling your leg.

author: EEVblog
author_rank: Unknown
timestamp: January 25, 2016, 01:46:21 pm
content: Thanks for the logo, but ultimately I think if I had a logo it's got to be a "logo" as most know it i.e. a symbol/emblemNot just the name EEVblog written in a fancy way, because as mentioned the EEVblog name already has an established font, colour, and look etc.I'm not opposed to a symbol logo (that's why I got the face & hand), but I don't see it as all that important. And of countless ones people have tried, I haven't really seen anything that looked appropriate, apart from the hand & face one.

author: eamoex
author_rank: Contributor
timestamp: January 25, 2016, 01:51:48 pm
content: Quote from: EEVblog on January 25, 2016, 01:46:21 pmSounds about right.Quote from: EEVblog on January 25, 2016, 01:46:21 pmFair enough.Quote from: EEVblog on January 25, 2016, 01:46:21 pmCountless have tried? Now I feel awkward, really.Nevermind this thread. Keep the great blog rocking!