hybridfree/eevblog-posts huggingface dataset:
EEVBlog.com invalid SSL certificate? - Page 1
Forum section: electronics / general

author: IanB
author_rank: Super Contributor
timestamp: June 29, 2017, 06:54:03 pm
content: This has been popping up today but I have not seen any reports about it. Is it known and being addressed?

author: buck converter
author_rank: Regular Contributor
timestamp: June 29, 2017, 07:14:51 pm
content: also getting this error

author: Len
author_rank: Frequent Contributor
timestamp: June 29, 2017, 07:36:43 pm
content: See earlier threads:https://www.eevblog.com/forum/chat/forum-bug-report-the-ssl-certificate-is-acting-up-on-cloudflare/https://www.eevblog.com/forum/chat/eevblog-store-ssl-certificate/
EEVBlog store SSL certificate - Page 1
Forum section: electronics / general

author: pkr
author_rank: Newbie
timestamp: June 29, 2017, 08:02:41 am
content: Hi Dave,I'm not sure if this is directly related to the other SSL issue being reported earlier today, but I went to look at the BM235 ( linked from your eMail of yesterday ) and getQuoteNavigating the site works up to the 'Add to cart' button when the same error gets reported.

author: Jeroen3
author_rank: Super Contributor
timestamp: June 29, 2017, 09:26:18 am
content: To be more precise, bypassing cloudfare make chrome tell:Code:ERR_SSL_VERSION_OR_CIPHER_MISMATCHUnsupported protocolThe client and server don't support a common SSL protocol version or cipher suite.While IE tells:Code:Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to https://104.31.75.133 again.If this error persists, it is possible that this site uses an unsupported protocol or cipher suite such as RC4 (link for the details), which is not considered secure.Please contact your site administrator.

author: bitseeker
author_rank: Super Contributor
timestamp: June 29, 2017, 06:00:25 pm
content: Yes, TLS handshake fails.curl -I -vhttps://104.31.74.133* Rebuilt URL to:https://104.31.74.133/* Trying 104.31.74.133...* Connected to 104.31.74.133 (104.31.74.133) port 443 (#0)* ALPN, offering http/1.1* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH* successfully set certificate verify locations:* CAfile: /etc/ssl/certs/ca-certificates.crtCApath: /etc/ssl/certs* TLSv1.2 (OUT), TLS header, Certificate Status (22):* TLSv1.2 (OUT), TLS handshake, Client hello (1):* TLSv1.0 (IN), TLS header, Unknown (21):* TLSv1.0 (IN), TLS alert, Server hello (2):* error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure* Closing connection 0curl: (35) error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure
Forum bug report: the SSL certificate is acting up on CloudFlare. - Page 1
Forum section: electronics / general

author: technix
author_rank: Super Contributor
timestamp: June 29, 2017, 06:21:41 am
content: It is nice to see the blog start supporting TLS, but it is acting up again. CloudFlare is reporting invalid TLS certificate issue now.

author: Brumby
author_rank: Unknown
timestamp: June 29, 2017, 07:00:39 am
content: Ditto.I came in via http:

author: bitseeker
author_rank: Super Contributor
timestamp: June 29, 2017, 05:49:32 pm
content: Additional info athttps://www.eevblog.com/forum/chat/eevblog-store-ssl-certificate/
Trouble Posting? - Page 1
Forum section: electronics / general

author: Falcon69
author_rank: Super Contributor
timestamp: June 28, 2017, 06:17:06 am
content: Anyone having trouble posting?I can't post in some topics? Heck, I wonder if this is even going to post?

author: Falcon69
author_rank: Super Contributor
timestamp: June 28, 2017, 06:23:56 am
content: Never MindI figured it out.If posting and adding pictures, if the pictures are too big, it will blank out everything as if you are starting to post a new topic and everything was erased. Simply start over and resize the images to a smaller size. Stupid that it erases everything though, especially after you spent the time to write an entire book!

author: StillTrying
author_rank: Super Contributor
timestamp: June 29, 2017, 04:06:10 pm
content: Quote from: Falcon69 on June 28, 2017, 06:23:56 amClicking the browser's Back button is always worth a try to get your text back.Posting often gives me a message saying 84 Chars is too long, I just ignore it.
Zebra TC56 - Page 1
Forum section: electronics / general

author: Lord of nothing
author_rank: Super Contributor
timestamp: June 29, 2017, 08:50:44 am
content: HiI asked in different Forum but it look like nobody use it.Are anyone here who have practical experience with the Device?Sure I read all the Manuals but there are still question.That I realy need is an durable rugged Business Phone without the consumer shit.My Nokia 808 was perfect.Everything was working and dont required some shit application with build in spam.
FMEA - looking for good book - Page 1
Forum section: electronics / general

author: Reminx123
author_rank: Contributor
timestamp: June 30, 2017, 09:58:43 pm
content: HiI am looking for a good book about FMEA; I know there is plenty of them in the market, that's why I am asking, to have some sort of "selection" that can guide to pickup the right one.Book should be concise (not looking for 300-400 pages manual) and comprehensive, I have in mind Taiichi Ohno "Toyota production system" as the perfect example.Any hint?

author: coppice
author_rank: Super Contributor
timestamp: June 30, 2017, 10:10:09 pm
content: I've found the quality of FMEA work to have far more to do with the attitude of those doing the work than any processes they might be trained in. I've been horrified by people who do nothing but FMEA work for a living glossing over large areas of potential failures.

author: floobydust
author_rank: Super Contributor
timestamp: June 30, 2017, 10:20:41 pm
content: You mean Failure Mode Effect Analysis (FMEA) ? As in safety, explosions etc? I can't see Toyota's production system in that.There are several texts on Functional Safety that explain the FMEA. It depends on if it is a transistor/MCU or burner gas valve that is failing, what your system looks like.The Safety Critical Systems Handbook: A Straightforward Guide to Functional Safety: IEC 61508 (2010 Edition), IEC 61511 (2015 Edition) and Related Guidancethis is the latest but older editions are pretty good too.

author: Reminx123
author_rank: Contributor
timestamp: June 30, 2017, 10:52:01 pm
content: Quote from: coppice on June 30, 2017, 10:10:09 pmThis is not my expected answer, you do not suggest any book. Anyway thanks again for your effort

author: coppice
author_rank: Super Contributor
timestamp: June 30, 2017, 10:56:31 pm
content: Quote from: floobydust on June 30, 2017, 10:20:41 pmFMEA is not specifically a safety thing. Its about analysing the ways a system can fail, and the effects of those failures. There might be reduced functionality, a total loss of functionality, a cost impact, or there might be a safety impact.

author: Reminx123
author_rank: Contributor
timestamp: June 30, 2017, 10:56:52 pm
content: Yes, Failure Mode Effect AnalysisI am sorry for the confusion, the reference to Toyota production system book (the one done by Taiichi Ohno) was added as an example of a book particularly well written

author: joeqsmith
author_rank: Super Contributor
timestamp: June 30, 2017, 11:18:12 pm
content: I've had to do a few FMEA and FMETs over the years. The standards I had to follow were all mandates. So sorry, no book on the subject just the standards. These were product specific. Some were at the PCB level, others at more a system level. Never fun.
Has anyone heard of an Aeon Dynamic Simulator DS6 - Page 1
Forum section: electronics / general

author: andybisson
author_rank: Newbie
timestamp: June 28, 2017, 09:37:21 pm
content: I just got a real analogue computer on e-bay and it seems to be fully functional but there is no documentation online. If anyone has any documentation for an Aeon Dynamic Simulator DS6 it would help a lot.I need to make or procure a large number of 2mm patch cables to get this thing working but its operation is fairly clear, it has six integrators, three summers and a multiplier along with an array of six ten-turn pots for coefficient input.The identity of the multiplier chip is hard to discern but it has x, y and z inputs and given some time and some patch cables I will be able to figure out what it actually does.This whole process would be much easier if I could locate the manufacturer and get a manual or maybe even circuit diagrams.Either way this beast is going to be a lot of fun to explore and play with!Thanks,Andy
uCurrent Gold new stock - Page 1
Forum section: electronics / general

author: Imed
author_rank: Newbie
timestamp: June 26, 2017, 09:53:22 am
content: Hi,I want to buy uCurrent Gold device, but it seems it's out of stock in Europe and in eevblog shops as well, can anyone inform me when it might be available again or from where I should buy it?Thanks in advance,

author: chacha20
author_rank: Newbie
timestamp: June 27, 2017, 12:29:14 pm
content: Hello,I'm building one.I guess it will be ready around mid of August (I need to wait for a part that is not on stock currently).We could share the costs if you also want to build one?p.s.: I've ordered 5 PCBs today (color: red).

author: Imed
author_rank: Newbie
timestamp: June 28, 2017, 11:14:33 am
content: Hello,I guess middle of August is too late for me...if it might be available very soon I can share the price with you if it's not so high

author: chacha20
author_rank: Newbie
timestamp: June 28, 2017, 11:24:41 am
content: There are 2 reasons why a date earlier than August is very difficult (without a substantial increase in price):Mouser (where I get the parts from) will get the op amp LMV321AS5X on 4th August.And I need to wait for the PCBs and the post bindings to get shipped from China (guess that will take a month).The cost will be around 40€ + shipping.
Militaria - photos of Finnish WW2 artillery re-enactment  - Page 1
Forum section: electronics / general

author: Kremmen
author_rank: Super Contributor
timestamp: June 28, 2017, 11:38:26 pm
content: For those who are amused by things military;As part of the 100th jubilee year of the Republic of Finland, the 1st battery of the historical Finnish Army heavy artillery battalion 1 re-enacted a preparation and firing of the original 155 mm field pieces of the period.At the same time the Armor School got a new commander and that was celebrated with due military pomp & ceremony. Some pictures from the stuff on display included as well.http://imgur.com/a/sMiUW

author: xrunner
author_rank: Super Contributor
timestamp: June 28, 2017, 11:51:20 pm
content: Nice set of pics. I actually liked the little tractors.

author: Kremmen
author_rank: Super Contributor
timestamp: June 29, 2017, 08:56:13 am
content: Thanks,I don't think the McCormicks are originally military equipment but rather general purpose mini caterpillars.

author: Kremmen
author_rank: Super Contributor
timestamp: June 30, 2017, 05:50:57 pm
content: Raw footage of some Leos & other stuff parading for the new commander of the Armor School at Parola. The troop carriers are soviet made MTs or something like that.https://youtu.be/4Oc2XZvoYr4
PCBWay promo code------round 2 - Page 1
Forum section: electronics / general

author: ansonbao
author_rank: Regular Contributor
timestamp: June 26, 2017, 11:55:20 am
content: I ever shared in eevblog other section and thanks for everyone's support,including eevblog.Our vision is to help engineers build more wonderful projects all the time.As I always said,innovation for better life.In order to express our gratitude, I will announce some promo code to help engineers save costs in eevblog from time to time.You just need to login inPCBWayand redeem the coupon.Please notice that each promo code can be redeemed once.We are pcb manufacturer and also offer pcb assembly service.The promo code can be used to pay for the pcb and freight.The round-2 promo code (this is the same series as the previous promo code):b6ea34382e2c6764fbd5c4f73a76a00cfbdd8361e1071c8760e64d20bccf70e17daa038dbf68d40d

author: ansonbao
author_rank: Regular Contributor
timestamp: June 27, 2017, 02:08:01 pm
content: there are still some promo code available,First come, first served.
Sideways Elevators - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: June 26, 2017, 08:32:24 am
content: As a kid I was always fascinated by the elevators in Star Trek TOS, they went sideways as well as up and down. Well, now someone has actually done it.http://www.wired.co.uk/article/thyssenkrupp-multi-maglev-elevator

author: Halcyon
author_rank: Unknown
timestamp: June 26, 2017, 08:34:00 am
content: Sorry to burst your bubble, but it's been done.

author: dexters_lab
author_rank: Unknown
timestamp: June 26, 2017, 03:33:01 pm
content: latest video from Tom... featuring that new lift!

author: tszaboo
author_rank: Super Contributor
timestamp: June 26, 2017, 05:07:52 pm
content: I thought Sideways Elevators are called trains...Sorry, could not resist.They had elevators like this in Totall recall 2012. Im not talking about the ridiculous elevator to Australia.I think the ThyssenKrupp implementation is impressive. Basically, for very big buildings, you run as many elevators as needed on two+ rail system. No more 6 elevator shafts next to each other, and guess game, which door will be good for you. Plus it goes sideways.

author: tom66
author_rank: Super Contributor
timestamp: June 26, 2017, 06:06:44 pm
content: Quote from: dexters_lab on June 26, 2017, 03:33:01 pmWell, that looks insanely expensive. Looks like one air-cooled LIM driver per foot or so.

author: calexanian
author_rank: Super Contributor
timestamp: June 26, 2017, 11:46:24 pm
content: No great glass elevator jokes? Wonkavator? Sideways and slantways and backways and......
Redundant traces in the PCB board design - Page 1
Forum section: electronics / general

author: Rama nayak
author_rank: Newbie
timestamp: June 26, 2017, 09:15:40 pm
content: Hi.. I have checked the PCB board of the ucurrent GOLD in Altium. There appears to be traces on the bottom layer going out to 4 corners of the board (e.g. traces from VGND, V-,B+). What is the purpose of these traces? They are not connected to any component.

author: thm_w
author_rank: Super Contributor
timestamp: June 26, 2017, 09:26:25 pm
content: Should be in one of these:used for speeding up production testing.
Have you ever came across an input method package that requires...!!! - Page 1
Forum section: electronics / general

author: technix
author_rank: Super Contributor
timestamp: June 26, 2017, 05:45:07 pm
content: ... location and network connectivity. Keep in mind on smartphones any input, including password, need to go through the input method.This is anout the Oppo A37m my ISP shoved down my throat.I have bought the SIM7600CE module and the MT7688 wireless router module, so cooking up something of my own should be fairly easy from this point on.
Big radioshack legacy auction - via hackernews - Page 1
Forum section: electronics / general

author: johnkeates
author_rank: Contributor
timestamp: June 25, 2017, 10:43:22 pm
content: Just read on hackernews that some radioshack archive got cleaned up and a lot of the stuff is getting sold in an auction. Not sure if this is of any interest to anyone (or if it was already posted -- search didn't find it), but one link points here:https://ubidestates.hibid.com/catalog/103245/radioshack-auction--1/Seems to not only include vintage equipment, but store stuff as well, like signs and branding.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 26, 2017, 04:17:34 pm
content: It washttps://www.eevblog.com/forum/chat/radio-shack-memorabilia-auction/
EEVBlog multimeter - Page 1
Forum section: electronics / general

author: joris
author_rank: Contributor
timestamp: June 26, 2017, 05:03:40 am
content: Hi David,I heard you talk about some of the pains David2 has been going through to set up a cross platform setup for the multimeter app. There was mention of "ohhh wouldnt it be nice if we can just javascript it". Yes you can! There are various platforms that let you package a html/js app in a browser wrapper (for each platform, perhaps even desktop computers) that exposes additional api's that are normally not available in the browser.I have some experience with Cordova and this plugin:https://github.com/don/cordova-plugin-ble-centralIt works pretty neat, you can just do stuff like:ble.startScan([], function(device) {console.log(JSON.stringify(device));}, failure);// send 1 byte to switch a light onvar data = new Uint8Array(1);data = 1;ble.write(device_id, "FF10", "FF11", data.buffer, success, failure);Also it sounds like you guys are going for a old skool BLE module for the communication. It's probably a little late for this but I would recommend looking into the mbed platform in combination with a Nordic BLE module. This let's you run the application on the BLE SoC itself (Only 1 micro to flash/ota update, lower power, less space, lower cost, better control over the communication)https://developer.mbed.org/platforms/?connectivity=3https://redbear.cc/product/ble/mb-n2.htmlThe workflow to write firmware is super nice, and it has a very easy to use API:https://github.com/ARMmbed/mbed-os-example-ble/blob/master/BLE_LED/source/main.cppWill it have a microcurrent range setting?Cheers!
OMG I've been published in DIYODE magazine! - Page 1
Forum section: electronics / general

author: android
author_rank: Regular Contributor
timestamp: June 26, 2017, 08:46:32 am
content: The inaugural issue turned up today...admittedly my humble contribution is the very last article before the cartoons, but heh I'm still chuffedWhat an excellent birthday present!Thanks DIYODE!

author: Halcyon
author_rank: Unknown
timestamp: June 26, 2017, 08:47:45 am
content: Congrats! (And happy birthday!)Care to include a scanned copy for us to read?

author: MagicSmoker
author_rank: Super Contributor
timestamp: June 26, 2017, 10:14:08 am
content: I've had a few magazine articles published myself and it is loads of fun, even if the effective hourly rate sucks...Looks like this is the magazine:https://diyodemag.com/Sounds very much like the Aussie version ofMake Zineover here. Or maybeNuts & Volts.

author: JoeO
author_rank: Frequent Contributor
timestamp: June 26, 2017, 03:48:01 pm
content: Quote from: Halcyon on June 26, 2017, 08:47:45 amHere is your link!https://diyodemag.com/prelaunch

author: thm_w
author_rank: Super Contributor
timestamp: June 26, 2017, 08:49:10 pm
content: Quote from: JoeO on June 26, 2017, 03:48:01 pm$7, he was looking for a scan of the page.

author: Halcyon
author_rank: Unknown
timestamp: June 27, 2017, 06:05:54 am
content: Quote from: thm_w on June 26, 2017, 08:49:10 pmYes, I was hoping to read your article (and maybe a comic or two).

author: android
author_rank: Regular Contributor
timestamp: June 27, 2017, 09:04:47 am
content: Quote from: Halcyon on June 27, 2017, 06:05:54 amSorry Halcyon, the DIYODE article is not mine to post, but I can point you to my hackaday project at:http://hackaday.io/project/3530-pub-programmable-usb-button...and source code at:https://github.com/abend0c1/pub(also on sourceforge and bitbucket to be sure to be sure )I used a very robustrotary encoder technique originally published by Ben Buxton(which I improved of course), but I'm most proud of coming up with a user interface that only uses a text editor like Notepad or gedit ... no host-side coding required.
CONGRATULATIONS! - Page 1
Forum section: electronics / general

author: etl17
author_rank: Contributor
timestamp: June 22, 2017, 05:22:56 pm
content: A huge "thank you" to Dave for giving us ONE THOUSAND awesome episodes!!!Youtube would not be the same without you! (at least from a geek's point of view!).Thank you!

author: Ampera
author_rank: Super Contributor
timestamp: June 23, 2017, 12:59:09 am
content: Who cares? It's an arbitrary number anyways, so why not set the milestone here instead of getting technical?

author: helius
author_rank: Super Contributor
timestamp: June 23, 2017, 04:05:06 am
content: At some level, can we really be certain that anything we recognize and value is objective and not merely subjective? Such a deep and abiding problem in epistemology isn't going to be resolved in a thread on an internet message board.

author: Ampera
author_rank: Super Contributor
timestamp: June 23, 2017, 04:26:32 am
content: Quote from: wilfred on June 23, 2017, 03:56:06 amI am asking as a general rhetorical question, who cares.That is the position I want to take. Have you also factored in the episodes and videos that were not numbered in any way? Even if one accounted for the missing episodes, it still wouldn't be his 1000th video.There are also no rules that dictate what can or cannot be treated as a milestone. If you feel that the skewed numbering of the 1000th episode should be taken into account, you are free to do the maths and celebrate on your own terms, while me several other people are choosing to celebrate the official number that Dave had placed on the video as the milestone.

author: Electro Detective
author_rank: Super Contributor
timestamp: June 23, 2017, 04:39:37 am
content: I'm not sure which direction this post is headedso I'll hedge my bet and congratulate Dave in advance for the official numerically verified 1000th video when it arrives,and all the other awesome stuff he does well.(justa when I thought I gotta outta electronics, Dave issa pulla me back in...)

author: mtdoc
author_rank: Super Contributor
timestamp: June 23, 2017, 04:45:48 am
content: Quote from: Electro Detective on June 23, 2017, 04:39:37 amHa! yes - Dave as the Godfather.

author: Brumby
author_rank: Unknown
timestamp: June 23, 2017, 07:31:57 am
content: Quote from: wilfred on June 22, 2017, 10:28:16 pmMaybe you should look at ALL the videos Dave haspublished- and you'll find that the number is well over one thousand.

author: Dubbie
author_rank: Unknown
timestamp: June 23, 2017, 09:49:57 am
content: I bet you are fun at birthday parties Wilfred!

author: amyk
author_rank: Super Contributor
timestamp: June 23, 2017, 11:54:51 am
content: I'd wait until 1024 videos

author: Ampera
author_rank: Super Contributor
timestamp: June 23, 2017, 04:50:35 pm
content: Quote from: amyk on June 23, 2017, 11:54:51 amStill waiting for BEEF number of videos.
Xerox Alto Restoration  - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 25, 2017, 12:36:00 am
content: At least part of this has been posted before but here it is all together. Pretty cool stuff.https://www.youtube.com/playlist?list=PL-_93BVApb58I3ZV67LW3S_JEMFnDrQDj
Single Transistor Oscilator soldering surface? - Page 1
Forum section: electronics / general

author: kalel
author_rank: Frequent Contributor
timestamp: June 22, 2017, 03:49:48 pm
content: I wrote the subject as single transistor oscillator, as I would like to try making one of those as a simple test, although similar rules might apply for other kinds of circuits that oscillate.I'm wondering which surface works best or worst (and why).By surface, I mean for example:- Point to point / no surface needed- Breadboard- Protoboard- Dead Bug style (with all virtual grounds soldered to copper of a PCB)- Etched PCB (I'm putting this one last as I don't have the equipment for that, and ordering something for a quick test is not optimal, but it would still be good to know any advantages or disadvantages)I'm not really targeting any really high frequencies (flashing a LED for example, or at most something in the audible range), and I'm not sure if/how much frequency dependent the optimal surface is.If there aren't any general rules and this depends entirely on specific frequency targeted, as I don't have one yet (just a rough idea of the range as mentioned), it might be difficult to answer this question.

author: Zero999
author_rank: Super Contributor
timestamp: June 23, 2017, 12:11:27 pm
content: It really doesn't matter at low frequencies.Also please don't create multiple threads for the same project. It doesn't get you more help or better answers to your questions.https://www.eevblog.com/forum/beginners/newb-question-single-transistor-oscilator/msg1239686/#msg1239686
Radio Shack Memorabilia Auction - Page 1
Forum section: electronics / general

author: mtdoc
author_rank: Super Contributor
timestamp: June 23, 2017, 05:36:03 pm
content: Just noticedthis auction linked on the Radio Shack websiteI doubt there's any bargains to be had there but I found it both fascinating and sad...

author: MarkS
author_rank: Unknown
timestamp: June 23, 2017, 11:34:34 pm
content: There needs to be guys in cheap suits discretely following the participants in the auction."Can I help you find anything today?"No."OK. I'll be standing right behind you, breathing down your neck if you need anything."

author: Zero999
author_rank: Super Contributor
timestamp: June 24, 2017, 03:26:16 pm
content: Quote from: mtdoc on June 23, 2017, 05:36:03 pmYes, no bargains, just overpriced junk.https://ubidestates.hibid.com/catalog/103245/radioshack-auction--1/

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 24, 2017, 05:24:20 pm
content: JUNK?! There be TRASH-80s in them there hills!EDIT: There are also a few old stereos I'd like to get my grubby mits on.TUBES?!

author: Electro Detective
author_rank: Super Contributor
timestamp: June 24, 2017, 11:28:23 pm
content: Fire up the Time Tunnel,send it all back where it came !
What is the value of the 858D hot air station fuse - Page 1
Forum section: electronics / general

author: starplayer
author_rank: Contributor
timestamp: June 22, 2017, 05:05:09 pm
content: Hi there. I bought a Youyue 858D, European 220V, recently, but it came with no fuseCan anyone that has one tell me its value and type so that I don't burn down the house?Thank you.

author: floobydust
author_rank: Super Contributor
timestamp: June 23, 2017, 05:45:48 am
content: 220V heater is about 72ohms so 675W and 5A fuse used (fast-acting).110V heater is about 20ohms so 611W and 8A fuse used (fast-acting).I would never leave it plugged in, it might burn the house down. The safety on these units is very poor.Check but there is mains power going to the front panel connector/wand, even when the unit is switched off.

author: stj
author_rank: Super Contributor
timestamp: June 23, 2017, 08:13:39 am
content: it comes with a 4A fuse.

author: Jeroen3
author_rank: Super Contributor
timestamp: June 23, 2017, 08:14:55 am
content: If it arrived out-of-the-box without a fuse, it was not tested. Return it.
1962 time dilation experiment with u mesons: - Page 1
Forum section: electronics / general

author: Wytnucls
author_rank: Super Contributor
timestamp: June 17, 2017, 05:21:12 pm
content: Interesting record of how science was done in the 60s. Well worth watching if you have 30 minutes to spare.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: June 17, 2017, 05:40:34 pm
content: Tektronix 585 with 81 adapter?...what a weird scope. 9 horizontal divisons?edit again.. never mind, it's a mask.

author: jimdeane
author_rank: Regular Contributor
timestamp: June 21, 2017, 10:18:35 pm
content: We do the same experiment with the cosmic ray muon detectors in QuarkNet, a US particle physics outreach program for high school students and teachers.

author: LabSpokane
author_rank: Super Contributor
timestamp: June 22, 2017, 04:47:10 am
content: Thanks! That video literally made my day. I loved studying Special Relativity. Hugely fun stuff.

author: LabSpokane
author_rank: Super Contributor
timestamp: June 22, 2017, 07:03:47 pm
content: For those who want to have fun with Special Relativity, the classic undergrad text by Taylor and Wheeler is now free on Archive.org:https://ia801301.us.archive.org/22/items/SpacetimePhysicsIntroductionToSpecialRelativityTaylorWheelerPDF/Spacetime%20Physics%20-%20Introduction%20to%20Special%20Relativity%20[Taylor-Wheeler]PDF.pdfSpecial Relativity is very mathematically accessible and fun.
Good warning, but a bit late... - Page 1
Forum section: electronics / general

author: Rick Law
author_rank: Super Contributor
timestamp: June 22, 2017, 06:51:37 am
content: It would seem too silly to happen, but it did. They blamed it on the software.Quoted From Article:Caltech staffer sends out alert for 6.8 earthquake...that happened in 1925The US Geological Survey sent out an email alert Wednesday afternoon saying a magnitude 6.8 quake had struck in the Pacific Ocean 10 miles west of Santa Barbara.The report cause huge ripples on Twitter and in newsrooms across the country, but suspiciously no reports of anyone having felt the temblor.USGS geophysicist Rafael Abreu says researchers were working on the 1925 earthquake when the mistaken alert went out.Link to article:http://www.foxnews.com/us/2017/06/22/caltech-staffer-sends-out-alert-for-6-8-earthquake-that-happened-in-1925.html
Sydney suppliers - Page 1
Forum section: electronics / general

author: Tinus
author_rank: Newbie
timestamp: June 21, 2017, 08:18:29 am
content: Hi all,I'm moving to Sydney at the end of June for work, from South Africa. I unfortunately can't take along much of my kit. Can I please get recommendations as to where in Sydney to get the basics (soldering iron, etc)?Kind regardsTinus

author: DTJ
author_rank: Super Contributor
timestamp: June 21, 2017, 08:33:34 am
content: Some starters:Hobbyist type stuff:https://www.jaycar.com.auwww.altronics.com.auCommercial outlets:http://au.rs-online.comhttp://au.element14.comThere's mouser/digikey/newark etc.The Sydney locals will know the small goldmine places.

author: Shock
author_rank: Super Contributor
timestamp: June 21, 2017, 12:15:43 pm
content: Go to maps.google.com enter where you want to search e.g. sydneyThen once there enter what business you want to find e.g. electronic components

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: June 22, 2017, 03:30:53 am
content: Some suppliers used in Australia, not necessarily Sydney, some are international companies:RSElement14UptonOritechMektronicsEmonaWESGood old WES...good for TV microwave parts etcWagnerWES is a subsidiary of WagnerGumtreeGood for cheap stuff sometimes. Kinda like Craig's list USA. Ya can buy your stolen stuff back...cheap!
Anybody knows Coq? - Page 1
Forum section: electronics / general

author: vlad777
author_rank: Frequent Contributor
timestamp: June 21, 2017, 11:31:50 pm
content: I am trying to prove that if today is Friday then next day is weekend.The last line fails , because I don't know the syntax , please help.First on the list is to express in proper syntax what is on the last line,the prove it.BTW I am desperate for most most basic examples for Coq.Many thanks.Inductive day : Type :=| monday : day| tuesday : day| wednesday : day| thursday : day| friday : day| saturday : day| sunday : day.Definition next_weekday (d:day) : day :=match d with| monday => tuesday| tuesday => wednesday| wednesday => thursday| thursday => friday| friday => saturday| saturday => sunday| sunday => mondayend.Definition is_weekend (d:day) : bool :=match d with| monday => false| tuesday => false| wednesday => false| thursday => false| friday => false| saturday => true| sunday => trueend.Theorem myt : (forall x : day, next_weekday(friday) -> is_weekend(x) ).

author: vlad777
author_rank: Frequent Contributor
timestamp: June 22, 2017, 12:11:46 am
content: This works:Theorem myt : forall (x : day) , is_weekend(next_weekday(friday)) =true .But I would like a theorem that is not simultaneously the proof itself.Edit:This is better:Theorem myt : forall (x : day) , is_weekend(x)=true -> next_weekday(x)= monday \/ next_weekday(x)= sunday .Now how do I prove it?Edit2: This is what I meant:Theorem myt : forall x : day, next_weekday(x)=sunday -> is_weekend(x)=true .
Grillbot - barbecue grill cleaning robot - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 23, 2017, 02:15:32 am
content: https://youtu.be/bsJmkHRYxiYhttps://grillbots.com/Real world review.......https://youtu.be/76qVx6pGE1M

author: Bud
author_rank: Super Contributor
timestamp: June 23, 2017, 02:41:35 am
content: A sureway to scare shiite out of my cat !

author: Electro Detective
author_rank: Super Contributor
timestamp: June 23, 2017, 04:30:38 am
content: yeah ok... looks like a goer,but how much beer and Chardonnay will Grillbot drink when there's no cleaning work and no one's watching ?Can Grillbot handle cat and dog oopsie pool floaters too ?

author: mtdoc
author_rank: Super Contributor
timestamp: June 23, 2017, 04:39:06 am
content: Looks ok - though cleaning the grill grate is not a tough job to do by hand.The first person to market a robot to clean the heat bars and the goo that accumulates under them will have a winner.

author: endevor100
author_rank: Contributor
timestamp: June 23, 2017, 06:12:16 am
content: Most people that have something like this use it shortly after grilling to stripping away any char buildup and leaving bare grates until the next time they grill. This is actually not that great for your grill. The char acts as a protective coating and prevents the grates from rusting. Cleaning it also leave less time for the flavor to bake into the grates if you're the type of person that believes in that.I'm sure the product does what it is designed for, but its a better idea to just leave the grill be once you take you meat off and leave it. When you want to use it again get it up to temperature then clean with a hand brush for easiest removal.Source: I used to sell really expensive barbecues to rich people.
Personal rapid transit pods or just automated public golf carts - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: June 21, 2017, 11:28:19 am
content: is it Personal? or rapid? at 40kmh a look at automated public pods.has anyone ridden on one?take a look at golf cart motor specifications, then note the top speed of a golf cart is 23.81 mph = 40kmh with a range of just 10km same as a public pod car!is this more hype in the loop or serious public transport. many claims of saving time & city traffic congestion, but is it true.the point-to-point services has been compared to a taxi or a horizontal lift (elevator). you may need an elevator just to get to a pod from street level. or seriously have the pod use an elevator.I have re-posted this here as pod cars are related but not the same as self driving cars. more in common with elevators or golf carts.I am seeking additional information on the type of transmission used in this type of vehicle.so I can formulate the idea of addingRoad–Railcapability to a Pod vehicle.use of planetary gears in the hubs, matching the error in radius,diameter of using two sets of wheels on the same hub. matching rail surface velocity with the rubber road tire velocity.as the road and the rail tracks must be set at two different levels. for smooth transition between road surface & rail track.in addition there is the need for a rail safety zone.so before the Pod car can deploy a robot railway pantograph. the Pod car's rubber road tires must be clear of the road surface,and sitting entirely on the rails. using a road to rail transition ramp.now with the pantograph deployed, and charging batteries on the move, the Pod car can push speeds topping 80kmh with a dual power motor. before returning to the slower 40kmh road guideways at the end of the rail line.a transition ramp puts the pod car back on its rubber road tires. as it returns to running on the batteries.2: I am researching the use of Pod Car lift or elevators to get from street level to the 2 floor level of a city.3: Pod car roadway turntable or rail tape wheelhouse as a way to save space inside a pod Station -4: researching if elevator pod car 2 floor level guideway promenades in the sides of city buildings with vibration damping of a floating guideway decks. like a hole in the buildings for the pods guideways will work in a sci fi city.5: I am also researching Pod cars as a children's toy model idea or as a model line following robot toy that will work as a set of toy pods.in the pod videos note the sound of the gears, & the type of batteries used. note there are trying to keep the cost down.3 videosthe Heathrow Pods ultra global prt UKhttp://www.ultraglobalprt.com/wp-content/uploads/2011/08/PDF_Vehicle-features.pdfshows the type of lead acid batteries used , but not the type of transmission setup used.A Ride on the Heathrow Pods UK see the big wire fence, graffiti artists love slow moving white things.Masdar City PRT Personal Rapid Transit UAE for the harem?GATEway Project Self-Driving Shuttle Podcar UKmaybe setting magnets into the road can help? but the range public roads is limited?
Flown Soviet Sokol KV-2 Spacesuit on ebay - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 20, 2017, 01:51:31 pm
content: http://www.ebay.com/itm/ORIGINAL-FLOWN-SOVIET-SOKOL-KV-2-SPACESUIT-WORN-BY-COSMONAUT-SAVITSKAYA/232065526103?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649Interesting to see what this ends up selling for.

author: Bud
author_rank: Super Contributor
timestamp: June 20, 2017, 04:48:38 pm
content: No proof of authenticity of the item was offered.

author: xrunner
author_rank: Super Contributor
timestamp: June 20, 2017, 05:00:53 pm
content: Can't even zoom in on the pics. That's pretty lame.
Got my Wriggle - Page 1
Forum section: electronics / general

author: CharlieWorton
author_rank: Regular Contributor
timestamp: June 20, 2017, 08:29:16 am
content: Yeah, I know. That was clickbait.My Rigol 1054Z showed up today (actually, the sticker from FedEx showed up on my door). So, I zapped out to pick it up, got it fired up, all is good. Of course, it is now an 1104Z. Thank you, Riglol.Makes me wonder how that site stays up. Also makes me wonder how unhappy Rigol is about its existence. But at any rate, the 1104Z has now landed, at least for me.Had a busy day. Got some lumber cut for my new desk in the electronics room (got it home using the roof rack on my Civic), bought an inexpensive bandsaw for cutting pcb boards ($150 CAD on sale at Canadian Tire), got some lumber cut for my UV lightbox, designed some brackets to hold the lightbox together. Picked up what I hope will be suitable screws for the brackets. Didn't find any time in there to study for my electronics course, but I will tomorrow.And tomorrow, Amazon is delivering a toy that turns my dremel into a mini drill press for drilling circuit board holes. That will have to do until my computer controlled mill happens (and that's not happening any time soon).Also ordered an electronics timer from AliExpress which may, and the operative word really is may, be a decent timer/controller for my lightbox. The conversion from Chinese was so terrible that I really had trouble understanding what they were saying. I guess I'll find out in 3 months, when it shows up.https://www.aliexpress.com/item/dc-24v-Cycle-Timer-Delay-Time-Switch-Digital-Dual-display-Relay-Module-0-999-hr-min/32785423895.htmlThat's it. Going to bed. >Charlie
Reccomendation needed for AA lithium batteries. - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 18, 2017, 02:48:53 pm
content: Looking on Ebay for Energizer lithium batteries. Do not want to get stuck with fakes.Any good experiences?Looking at,http://www.ebay.com/itm/8-PCS-ENERGIZER-AA-ADVANCED-LITHIUM-1-5V-BATTERY-AA-4X-SIZE-EA91-FR6-12-2030-/332034849737?hash=item4d4ed1bbc9:g:2m0AAOSwux5YLNKmThanks

author: rdl
author_rank: Super Contributor
timestamp: June 18, 2017, 05:34:41 pm
content: I would only buy something like that from a reputable source to reduce the possibility of getting fakes. If not in a rush, I'd probably order from Amazon, after making sure it says "Ships from and sold by Amazon.com". If needed right away, I'd go to Home Depot or Walmart.

author: P90
author_rank: Frequent Contributor
timestamp: June 18, 2017, 09:19:07 pm
content: "recommendation"

author: Ampera
author_rank: Super Contributor
timestamp: June 18, 2017, 11:31:13 pm
content: My recommendation is to seriously consider if you need a modern device that needs AA batteries.After that, consider putting in a rechargable liion pack. It may cost a bit more in the short term, but if you truly use that device, in the long run it will save you, and keep you from running to the store every time you need more batteries.

author: rdl
author_rank: Super Contributor
timestamp: June 19, 2017, 02:05:52 pm
content: Adding a new rechargeable type battery pack is not always an option due to either space constraints or voltage requirements among other things. While most of my high usage devices that run from AA and AAA have been switched to NiMH, I'm still using alkaline here and there (wall clock, backup battery in shortwave radio, remote for TV and stereo, etc) where they work fine, but there is always the possibility of damage from leaking batteries. Lithium primary cells have a long shelf life and leakage is very rare. Lithium cells would likely be a good option in these cases.
Only on eBay - Page 1
Forum section: electronics / general

author: ZeTeX
author_rank: Frequent Contributor
timestamp: June 18, 2017, 09:32:53 am
content: So I write my own book from scratch in Microsoft Word,I list it for 5$,It gets removed sometime after though to "counterfeit".Of course, they didn't even review my book.. they just go around claim whatever they fucking want. retards.

author: Electro Detective
author_rank: Super Contributor
timestamp: June 18, 2017, 10:14:13 am
content: Write a book about this experience,title it "Only On Ebay"list it for $10see what happens...
[Dangers of Piezo] Piezo size/shape vs generated voltage? - Page 1
Forum section: electronics / general

author: kalel
author_rank: Frequent Contributor
timestamp: June 18, 2017, 03:48:29 pm
content: I didn't know how to make a proper subject, but I'm interested in some rough knowledge about what type of Piezo element items (e.g. small Piezo buzzer, larger Piezo, etc) makes what kind of voltage under what kind of conditions.I'm sure this might be difficult to measure with a multimeter (especially a cheap one, although less to feel sorry about if it does generate a high voltage), but I'm essentially trying to figure out if using a certain element such as a Piezo speaker will generate dangerous voltage, and under what conditions (e.g. is it a light tap, a squeeze, a strong hammer hit, a gun shot, etc.).I don't necessarily wish to start placing optocouplers everywhere I use a piezo buzzer. But I want to understand the danger a bit better (so if something like that is necessary, perhaps I might).

author: floobydust
author_rank: Super Contributor
timestamp: June 18, 2017, 04:12:35 pm
content: Piezos can generate a lot of voltage, as a fast pulse. Barbeques, lighters use them for ignitors.The small piezo speakers, put an LED across one, light taps and they easily flash the LED. Like when they are used as sensors for electronic drums.I just tried a neon lamp and a whack with a pen flashes the neon lamp, so over 90V there.If you hit one hard, it can damage an IC from the voltage spike. Best to use a scope to look at it, but the voltage depends on how hard the crystal is hit.It's a low energy pulse and resistor/zener is enough for protection.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 18, 2017, 05:51:16 pm
content: The piezo element is a usually small capacitor. When stressing it, there will be voltage / charge in it. The energy is limited by the capacitance. The voltage is approximately proportional to the amount of stress. It hit with something this creates a short pulse of high stress and thus a short pulse of high voltage. If stressed slow, one gets a long pulse (if the capacitor does not discharge). However the level of stress and thus the voltage is usually much lower. As the pulse energy is limited, a zener or similar is quite effective to limit the voltage.The voltage also depends on the dimensions of the piezo: if thin and thus high capacitance, the voltage is relatively small.
New Old Yuckiness - Page 1
Forum section: electronics / general

author: innkeeper
author_rank: Unknown
timestamp: June 17, 2017, 08:35:42 pm
content: I recently scored a NOS in still in the box leader LBO-516 Oscilloscope (it was a rebranded lab-volt but even came with a leader branded manual with the leader part number)it was fun opening this Japanese made time capsule circa ~1984 - was almost shame to open and unpack it.. but i got it to use not collect...anyway... all is good except the power cord. - it was a standard EIC C13 so i jsut grabbed one i had on hand and i was up and running....so hear is the weird thing about the cord, and i am just curious about this....both the nema 5-15 end and the eic c13 ends were all gooey/sticky like they had started to break down or something.The cord was still sealed in the original plastic bag, so its been sealed up since ~1984.anyone ever seen this happen before, and any idea what causes it?i was thinking it was maybe caused by whatever release agent they used on the molded plastic/rubber...I was also thinking maybe it was exposed to excessive heat but i don't see any other signs of anything wrong with other rubber or plastic items or the probes/wires etc.I'm used to finding older rubberized plastics dry rotted, but not turning to goo.Anyway its jsut a curious thing. anyone know about stuff like this or has any thoughts. I just found ti strange.

author: DimitriP
author_rank: Super Contributor
timestamp: June 17, 2017, 08:59:52 pm
content: QuoteI've had bicycle handle bar grips that turned to goo. One one bicycle both grips. On the other, only one. Go figure.

author: P90
author_rank: Frequent Contributor
timestamp: June 17, 2017, 09:13:41 pm
content: Quote from: innkeeper on June 17, 2017, 08:35:42 pmwhat note does the "chord" play?

author: innkeeper
author_rank: Unknown
timestamp: June 17, 2017, 09:35:17 pm
content: Quote from: P90 on June 17, 2017, 09:13:41 pmA and C

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 17, 2017, 11:05:09 pm
content: Is it green goo? It's probably plastisizer, a chemical used to make early pvc wires more flexible. It starts reacting with the copper and turns into a mess.

author: Cerebus
author_rank: Super Contributor
timestamp: June 17, 2017, 11:20:12 pm
content: Quote from: Cyberdragon on June 17, 2017, 11:05:09 pmAll flexible PVC has plasticizers in it, that's why the rigid type (window frames, cladding) is called uPVC, the 'u' standing for unplasticized. The point being that it's not justearlyPVC.The molded boots at both ends are probably a styrene-butadiene rubber (SBR) or a thermoplastic rubber (TPR). Many rubbers, both natural and synthetic, break down over time. There are lots of causes: oxygen, ozone, UV, solvents and (tada) contact with leached plasticizer from plasticized plastics. So I suspect you're right, the most probable explanation is plasticizer leaching from the PVC cable into the boots.