hybridfree/eevblog-posts huggingface dataset:
Academic circuit challenge - do they have these? - Page 1
Forum section: electronics / general

author: DrG
author_rank: Super Contributor
timestamp: June 09, 2020, 02:37:05 pm
content: I am regularly impressed by the answers to someone posting a question…how do I do this? I look at the answers as well as those answers resulting from a quick search and find several very different schematics….and yes, on occasion I even have my own “solution”.I was also thinking about this cooking show on TV called Chopped. They give three chefs the same basket of food items (with a flair for bizarre items) and they have to make a meal for some judges.Do they have an analogous competition or testing procedure in the Electronics and Computer world? No, I don’t think one would make a particularly popular TV show, although I would probably watch episodes if done right.So-called computer and electronics contests that I have seen almost always feature a particular component or don't have a collection of components at all, and I don’t mean something like that.So, the students have to build some function using all or some of the parts available for the solution. A basic passing grade is awarded if the circuit worked, but higher grades are awarded for various other characteristics of the solution like, price, precision, endurance, power consumption and so on. Of course, you would have to be pretty clever and intentional with the parts available.You can even include some controllers with programming capabilities in the “parts collection”.I am not necessarily talking about something along the lines of Apollo 13 CO2 scrubber, but that is the general idea. The key would be that the choice of parts would allow several different ways of solving the challenge and each of the solutions would have advantages and disadvantages with particular weightings such that there would be a “best” solution.I do see some value in a timed test (maybe even as long as 8 hours) along these lines that would tap into a skill set that I would *think* (and I stress it is only my thinking). The idea would be for the test to have both criterion and predictive validity, as I learned those terms.Do they already have such practical challenges in the academic EE world?
No more Big Bang? - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: June 08, 2020, 04:19:53 am
content: And I don't mean 'after you finished replacing all the RIFA capacitors'.This is interesting:The Real Crisis in Cosmology - The Big Bang Never Happened

author: greenpossum
author_rank: Frequent Contributor
timestamp: June 08, 2020, 04:22:53 am
content: Reminded me of the silly joke: How will the universe end?Gnab gib

author: Dubbie
author_rank: Unknown
timestamp: June 08, 2020, 04:34:08 am
content: This guy is generally regarded as a bit of a crank.See wikipedia for refutations of his work.Here is a brief one:http://preposterousuniverse.blogspot.com/2004/05/doubt-and-dissent-are-not-tolerated.html

author: Tomorokoshi
author_rank: Super Contributor
timestamp: June 08, 2020, 06:51:13 pm
content: It hasn't been the "Big Bang" since the '90's, when it became "THE HORRENDOUS SPACE KABLOOIE!"https://www.gocomics.com/calvinandhobbes/1992/06/21

author: borjam
author_rank: Unknown
timestamp: June 08, 2020, 06:55:48 pm
content: Quote from: Tomorokoshi on June 08, 2020, 06:51:13 pmIl Grosso Kaboom. There's an opera even!https://improbable.com/ig/miscellaneous/ig97-big-bang-libretto.html
A nice way to recycle those useless CDs/DVDs - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: June 08, 2020, 06:20:34 pm
content: A nice way to recycle those useless CDs/DVDs: use them as an optical guide.Stack a few with some distance in between and put an addressable LEDs strip in the middle, to make a mood lamp.
Fume extraction - Page 1
Forum section: electronics / general

author: rthorntn
author_rank: Frequent Contributor
timestamp: June 08, 2020, 08:05:40 am
content: Hi All,After I watched the EEVblog extractor review I ordered some of the Aliexpress Loc-Line and a fan from Digikey that had good Static Pressure (1.30” of Water), has anyone done this and built an extractor that puts fumes out a window:- Some form of sturdy desk clamp for the base of the Loc-Line- Something like a vacuum cleaner hose to get the rest of the way to the window- An enclosure for the fan, Loc-Line in one side, hose on the otherOr maybe it goes Loc-Line, hose and the fan enclosure is mounted in the window or vent?Thanks.Richard

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 08, 2020, 01:58:53 pm
content: 3" duct (very cheap) matches up almost perfectly to an 80mm server fan. Put the fan on the remote end so you can run it really fast without noise becoming excessive. The actual connection can be made with duct tape or a 3D printed adapter.
Photodiode. - Page 1
Forum section: electronics / general

author: Weiseste
author_rank: Newbie
timestamp: June 09, 2020, 08:05:15 am
content: Hello,My name is Dragos.I am beginner in simulation S.P.I.C.E.. and I use the simulator Micro-CAP 12, to simulate an electric schematic.I want to simulate the phototransistor PIN InGaAs IG17-series and to monitor grafically the rectangular electrical impulse, at an amplitude of a few volts generated by the photodiode depending on a period of time in ns.Please give me any advice.I do not know how to begin. I will attach a picture with the electric schematic.Thank you for understanding,Dragos.
Communication protocol - Page 1
Forum section: electronics / general

author: ArturN
author_rank: Newbie
timestamp: June 06, 2020, 04:47:11 pm
content: Hello,I cannot find name of communication protocol that was used in some device in EEVBLOG on Youtube.I remeber that protocol was based on colon and text e.g. "DEVICE:TEMPERATURE" or "DEVICE:RESET".Could u help me to find what was that protocol?

author: SiliconWizard
author_rank: Super Contributor
timestamp: June 06, 2020, 05:19:43 pm
content: Apparently you don't remember the protocol's name, or the device, or the video itself. Ah, memory!Anyway, a text-based protocol with colon separators and related to electronics: I'd say it's likely to be SCPI.https://en.wikipedia.org/wiki/Standard_Commands_for_Programmable_Instruments

author: ArturN
author_rank: Newbie
timestamp: June 06, 2020, 05:22:30 pm
content: That's it! Thanks a lot!Maybe do you know more protocols similar to this one?
Incorrect fuse sent by RS - Page 1
Forum section: electronics / general

author: syau
author_rank: Frequent Contributor
timestamp: June 05, 2020, 11:54:35 am
content: Order some 500mA slow blow fuse from RS, on received found the fuse were marked as 5Ainstead of 500mA. Called RS, asked them to inspect the item before ship and they sent replacement few days later. Same issue.Gave them a call again and asked them to check the lot again, finally get the right shipment todayThe first 2 shipment were from the warehouse in France while the correct one is from Germany

author: aix
author_rank: Regular Contributor
timestamp: June 05, 2020, 12:09:12 pm
content: I once had a similar issue with some switches. RS kept sending a slightly different variety (illuminated vs non-illuminated). I told them several times but in the end bought something else to unblock my project.

author: Siwastaja
author_rank: Super Contributor
timestamp: June 05, 2020, 12:27:10 pm
content: It is utterly unbelievable that the internal standard procedure of responding to the "wrong item" case, which likely is one of the most common problem cases, doesnotinclude checking if the items in the warehouse bin are correct / bin is correctly labeled!Or maybe there is no procedure. Just "putting off fires" in whatever way.

author: jogri
author_rank: Frequent Contributor
timestamp: June 05, 2020, 01:39:22 pm
content: Quote from: Siwastaja on June 05, 2020, 12:27:10 pmExactly the point, it is probably one of the most common problems...If they would send out a worker to check the contents of every box were someone reported that they received a wrong item they would probably need a person working nonstop on this issue… A lot of those cases are probably just "didn't read the description carefull enough when ordering" or "accidentally ordered wrong item, but thought they ordered the right one", it is way more efficient to flag only those bins for inspections were multiple reports of wrong items were filed.Sucks for the customer to receive the same wrong item a few times in a row, but saves a lot of money for the company.

author: thm_w
author_rank: Super Contributor
timestamp: June 05, 2020, 11:04:28 pm
content: Digikey specifically asked me to identify the wrong part I received, I'm certain they wanted this info to track down and either inspect the bin or adjust inventory appropriately.They know what they are doing at least.
what if you had to use every part in your collection? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: June 07, 2020, 07:38:45 am
content: What kind of crazy things would happen if you had to use every part in your collection boxes?Can you even imagine it?

author: TerraHertz
author_rank: Super Contributor
timestamp: June 07, 2020, 11:55:03 am
content: Define 'use' ?I mean, I could mix them with concrete and build a wall with the cast concrete bricks.

author: AndyC_772
author_rank: Super Contributor
timestamp: June 07, 2020, 12:55:07 pm
content: I maintain that the best use for a great many parts, currently sitting unused on shelves as they have been since they were made decades ago, involves compressed air and a dart board. Got a tube of original 74 series logic gates, or a job lot of 555 timers? Try to hit the bullseye from the other side of the lab, and no points for a part that bounces out.Given that I can have almost anything I actually need delivered free to my front door next day, I see no reason to waste valuable space on a random 'collection' of parts at all. I keep a simple lab stock of totally generic items like resistors and wire, but that's all. Any other parts I have are just the surplus from when I've bought complete kits for projects and not built them all up for some reason.I wonder, what would be the optimum barrel geometry and gas pressure to shoot the old OS-CONs I have taking up space on my top shelf?

author: nctnico
author_rank: Super Contributor
timestamp: June 07, 2020, 03:19:21 pm
content: Quote from: coppercone2 on June 07, 2020, 07:38:45 amI'd give them away and likely enable a hoarder. Like giving heroine to an addict... I feel guilty but it is so easy to have junk picked up instead of bringing it to the dump

author: Gregg
author_rank: Super Contributor
timestamp: June 07, 2020, 06:05:44 pm
content: Quote from: coppercone2 on June 07, 2020, 07:38:45 amI'd live a Long Long time

author: coppercone2
author_rank: Super Contributor
timestamp: June 07, 2020, 06:34:15 pm
content: Quote from: TerraHertz on June 07, 2020, 11:55:03 amthat would be a toxic building
Technology Before Micro-controllers - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: June 05, 2020, 08:34:11 am
content: a look at the technology before the age of micro-controllers that is still in use today.from the many types of telegraph, to the control system used by the Otis Elevator.I was researching railway technology of the 1900s. signals and other railway technology. for a railway locomotive projectwere I needed to know what electrical engineering was used at the time.research had links to George Westinghouse and the railway air brake systems.among other things, ships engine order telegraphs.I did came across this video about 1900s elevator technology long before the age of micro-controllers.clever people made do with what ever they had at the time.and some of this telegraph type electrical engineering work was still in use when this video was made.go to 2:30 on the 6:34 video 1958 gearless traction Otis Elevator machine room tour.
USB Stick and 5G - Page 1
Forum section: electronics / general

author: jacksat
author_rank: Newbie
timestamp: June 03, 2020, 05:46:53 pm
content: Any one of you interested in a £270 usb stick that protects you from 5G radiation.Then a have good news for you :one adresshttps://5gbioshield.com/Edit:Found a article from the BBC on thishttps://www.bbc.com/news/technology-52810220

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 03, 2020, 06:18:10 pm
content: Old news...https://www.eevblog.com/forum/dodgy-technology/5g-bio-shield/
Where can I find this connector?  - Page 1
Forum section: electronics / general

author: ftm
author_rank: Newbie
timestamp: June 02, 2020, 11:50:31 pm
content: Hello everyone,Does any body know were I can find this kind of wire to wire connector?The needle pierces the wire insulation and it stays put by a zip tie.Thanks!

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 03, 2020, 12:35:01 am
content: Solder a nail to a wire, then 3D print a cover with a notch for the zip tie.

author: floobydust
author_rank: Super Contributor
timestamp: June 03, 2020, 01:04:03 am
content: These are unsafe because you are tapping off a large high-current conductor with no fuse involved.Maybe they are common in South America? Not allowed in North America.
NTP7402 and NTP7414 datasheet is supported - Page 1
Forum section: electronics / general

author: kastell123
author_rank: Contributor
timestamp: June 01, 2020, 11:35:06 am
content: NTP7402 and NTP7414 datasheet is supported ?Please help.Thanks.

author: Simon
author_rank: Unknown
timestamp: June 01, 2020, 01:15:09 pm
content: Please do not double post.
Animal Crossing meets home electronics - Page 1
Forum section: electronics / general

author: boffin
author_rank: Unknown
timestamp: May 31, 2020, 09:38:51 pm
content: Someone at Nintendo is interested in hobby electronics. Look at what they've put into their popular "Animal Crossing" game

author: boffin
author_rank: Unknown
timestamp: May 31, 2020, 09:49:38 pm
content: It's almost like they snuck into my office

author: nctnico
author_rank: Super Contributor
timestamp: May 31, 2020, 10:28:13 pm
content: nice one

author: GlennSprigg
author_rank: Super Contributor
timestamp: June 01, 2020, 11:43:28 am
content: Quote from: boffin on May 31, 2020, 09:49:38 pmYou exaggerated!! You don't have a Radio !!!!

author: exe
author_rank: Unknown
timestamp: June 01, 2020, 12:20:58 pm
content: The power cord of the soldering iron looks a bit short to me.
Something interesting I found. - Page 1
Forum section: electronics / general

author: Nickk2057
author_rank: Regular Contributor
timestamp: May 31, 2020, 12:11:30 am
content: Well this is interesting. Found a wireless controller that I can reverse engineer to use for low voltage applications out of a smart light bulb. Merkury brand too.Links to the HD photo's:https://gyazo.com/44a0750e1bcfea754df563db066abab1https://gyazo.com/734be63ac559df033c8b6032bf8a2095https://gyazo.com/53a2c43c9d0dcfab5a03b0d51b079942https://gyazo.com/18301a6b3e5fc3f234fb77b278cf0ca3https://gyazo.com/7aded2b50241409455c3c716c0c6f8b3

author: cdev
author_rank: Super Contributor
timestamp: May 31, 2020, 01:57:01 am
content: That could be useful in home automation. is the range fairly decent or is it cheap? It certainly looks much more complicated than the woreless controllers in the various products around my home that use simple wireless switches.I'm gathering its one way wireless?

author: Nickk2057
author_rank: Regular Contributor
timestamp: May 31, 2020, 07:34:06 pm
content: It is actually two way communication used by the Smart Life app on phone or tablet. it uses the 2.4GHz wifi protocol. If put onto MOSFETs it would prove to be very useful for putting larger loads onto something that only goes for $20USD for a pack of 2 at WalMart.

author: Nickk2057
author_rank: Regular Contributor
timestamp: May 31, 2020, 07:34:37 pm
content: And it can be used with Google Home and Alexa.

author: Nickk2057
author_rank: Regular Contributor
timestamp: May 31, 2020, 07:40:13 pm
content: It also have outputs for RGBW if you want to put loads for all colors. Sadly it does not have support for CW if you want that also.
Flightradar24 - Page 1
Forum section: electronics / general

author: StillTrying
author_rank: Super Contributor
timestamp: May 29, 2020, 06:10:21 pm
content: is this helicopter doing.www.flightradar24.com/GTVHD/2497059f

author: nctnico
author_rank: Super Contributor
timestamp: May 29, 2020, 06:39:39 pm
content: Looking for Meghan & Harry

author: Gyro
author_rank: Super Contributor
timestamp: May 29, 2020, 06:44:12 pm
content: An 'eye in the sky' helicopter trying to find some (any) traffic?

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: May 29, 2020, 07:29:05 pm
content: Aerial Fliming. This is the company that owns that helicopter:https://www.arena-aircraft.com

author: Syntax Error
author_rank: Frequent Contributor
timestamp: May 29, 2020, 07:40:58 pm
content: I think this guy was trying out the Guiness fuel additive...

author: Syntax Error
author_rank: Frequent Contributor
timestamp: May 29, 2020, 07:43:04 pm
content: And these guys, they must have been using a car satnav...

author: Syntax Error
author_rank: Frequent Contributor
timestamp: May 29, 2020, 07:47:50 pm
content: And this RAF crew were on a training flight learning how to draw a pennenis...

author: StillTrying
author_rank: Super Contributor
timestamp: May 29, 2020, 07:52:04 pm
content: Quote from: Qw3rtzuiop on May 29, 2020, 07:29:05 pmYeah, I wonder why they took such a long 2 hour crisscross route.www.arena-aircraft.com/aircraft-fleet

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 30, 2020, 08:56:29 am
content: QuoteWell it seem that Aircraft was build in Austria!Beside of that does anyone share there ADSB Data?I could not recommend that Website sice the hide A LOT of Aircraft!

author: aargee
author_rank: Frequent Contributor
timestamp: May 31, 2020, 03:13:23 am
content: Someone turned Selective Availability on for the GPS network?That's how my position plots (not to scale) way back in the day.

author: Gyro
author_rank: Super Contributor
timestamp: May 31, 2020, 03:38:26 pm
content: Somebody must be getting awfully sick of the A27https://www.flightradar24.com/BIO05/2499fdddEdit: Owned by Bioflight Aerial Data Aquisition. Must be some kind of digital survey. Looks like they're extending the M27 after all.

author: Jeroen3
author_rank: Super Contributor
timestamp: May 31, 2020, 04:19:18 pm
content: Some time ago I looked at ads-b due to some low flying jets. Then I noticed this in the sky.Turned out they were having training day. We could see this radar jet reflection in the sun a few times.

author: tggzzz
author_rank: Super Contributor
timestamp: May 31, 2020, 06:24:08 pm
content: This kind of flight is always fun. Here he reached 18kft altitude.
Downlink freq for the today space flight? - Page 1
Forum section: electronics / general

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 30, 2020, 01:07:21 pm
content: Today the SpaceX should start. Does anyone have all downlink Freq?Maybe I have an Antenna for.And the ISS will over Vienna today to.Code:020-05-30 16:46:02 ISS 226.4 10.1 2.8 1496 261.9 37.02020-05-30 16:49:18 ISS 150.1 51.1 0.1 532 262.5 36.52020-05-30 16:52:36 ISS 73.0 10.0 1.9 1506 263.2 35.92020-05-30 18:22:49 ISS 270.8 10.0 2.3 1505 279.9 21.02020-05-30 18:26:08 ISS 349.2 51.8 -0.4 529 280.5 20.42020-05-30 18:29:27 ISS 67.1 10.0 1.6 1508 281.0 19.92020-05-30 19:59:57 ISS 292.1 10.0 1.8 1509 296.9 5.82020-05-30 20:03:15 ISS 8.6 49.1 -0.7 549 297.5 5.32020-05-30 20:06:33 ISS 86.0 10.1 1.3 1503 298.1 4.82020-05-30 21:36:48 ISS 288.6 10.1 1.5 1505 315.2 -7.42020-05-30 21:40:08 ISS 208.6 59.8 -1.2 485 315.9 -7.82020-05-30 21:43:28 ISS 128.3 10.0 Ecl 1504 316.6 -8.22020-05-30 23:15:02 ISS 249.1 10.0 1.1 1506 336.5 -16.62020-05-30 23:16:21 ISS 226.0 11.8 Ecl 1395 336.8 -16.72020-05-30 23:17:40 ISS 202.9 10.0 Ecl 1502 337.2 -16.7When the will connect?Thanks

author: Domagoj T
author_rank: Frequent Contributor
timestamp: May 30, 2020, 01:30:17 pm
content: Check these two documents:https://apps.fcc.gov/oetcf/els/reports/STA_Print.cfm?mode=current&application_seq=49678https://www.ntia.doc.gov/files/ntia/publications/compendium/0400.15-0401.00_01DEC15.pdfCrew dragon should dock with ISS about 20 hours after launch.

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 30, 2020, 02:12:23 pm
content: so 2,040Ghz + 400.5Mhz?

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 31, 2020, 11:02:19 am
content: Infos in German:http://www.satellitenwelt.de/iss.htm#CUCU
You know what I like? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 31, 2020, 01:45:13 am
content: 1960s tech goodness.https://www.americanradiohistory.com/Archive-Tele-Tech/60s/Electronic-Industries-1962-05.pdfI love this kind of stuff.

author: themadhippy
author_rank: Super Contributor
timestamp: May 31, 2020, 02:50:49 am
content: Is that Autocad version 0.1 on page 110?
the art of electronics : switching the high side of a load - Page 1
Forum section: electronics / general

author: Camelkos
author_rank: Newbie
timestamp: June 01, 2020, 04:26:54 pm
content: hi everybody,i'm reading the art of electronics 2 and i'm stuck at the circuit B to switch the high side of a load returned to ground in the chapter of bipolar transistors,can someone explain it to me please, thank you all !!

author: bob91343
author_rank: Super Contributor
timestamp: June 01, 2020, 08:59:44 pm
content: We don't all have that book so give us the source and perhaps we can help.

author: MarkF
author_rank: Super Contributor
timestamp: June 01, 2020, 09:25:48 pm
content: Is this the circuit?

author: bob91343
author_rank: Super Contributor
timestamp: June 02, 2020, 04:06:56 pm
content: If B is the circuit, then driving Q2 with a pulse will turn it on, which in turn provides base current for Q3 and thus energizing the load.

author: MarkF
author_rank: Super Contributor
timestamp: June 02, 2020, 07:33:54 pm
content: Duplicate post and answer here:https://www.eevblog.com/forum/beginners/the-art-of-electronics-switching-the-high-side-of-a-load-243714/
Android Phone Sd Card Not Showing Up On Pc - Page 1
Forum section: electronics / general

author: nvidia
author_rank: Regular Contributor
timestamp: May 24, 2020, 04:01:15 am
content: so i have an android 9.0 phone i got a 32gb sd card for it for 8nzd and i use it as the internal storage as phone only has 4gb built in and only 400mb free space android uses the rest of the spaceso i wanted to copy some files to my phone off my pc but when i go to this pc on my computer and click on my phone it only shows the internal 4gb storage no sd cardwhat can i do

author: andy3055
author_rank: Super Contributor
timestamp: May 24, 2020, 04:58:35 pm
content: You have to make sure that the phone itself can see the card first. Check/Google the phone model to see how much of a card it will be able to accept. For example, I have a Samsung Galaxy S5 (quite old) which takes a 128 GB card as against the entry level Samsung Galaxy Prime will only take a 32 GB card. If it is supposed to take the card you have, you may have to the phone settings and check what options you have there.

author: Syntax Error
author_rank: Frequent Contributor
timestamp: May 24, 2020, 05:20:08 pm
content: Check Settings > StorageYou may need to (re)mount the SD cardYou can also do this by dragging down the USB connected notification that should appear when you connect the otg cable.

author: GlennSprigg
author_rank: Super Contributor
timestamp: May 27, 2020, 01:02:55 pm
content: Try plugging the (micro SD) card straight into your laptop, or via an adaptor like....https://www.google.com/search?q=micro+sd+adapter&client=firefox-b-d&sxsrf=ALeKk03z0NkrXqQLr_SOf8QRLXpbKholuQ:1590584388521&tbm=isch&source=iu&ictx=1&fir=MNd_iDv5_-OKRM%253A%252Cig2Zf1_QBghLqM%252C_&vet=1&usg=AI4_-kTKvP2m6fEIVOUxtUNuDn085ld9FQ&sa=X&ved=2ahUKEwjd59nLjNTpAhVQSX0KHSrvASIQ_h0wAXoECAwQBA&biw=1366&bih=693#imgrc=wl8bsXy8RvriqMOr else, software wize, the best software is "Wondershare MobileGo" for android. Can do anything with it!!!
Prius smart key repair I did - Page 1
Forum section: electronics / general

author: Nickk2057
author_rank: Regular Contributor
timestamp: May 30, 2020, 12:52:45 am
content: So I was trying to figure out why my smart key would not be programmed to my car. It uses the 134.(something)kHz oscillation within the car. But would not get picked up by the car. So by checking the other working remote I found this problem. a TINY surface mount resistor link went open circuit. So I went and put another resistor from a donor board and fixed it and got it programmed to my 2005 Toyota Prius.
Rotary switches (4P4T & 4+P4T) - Page 1
Forum section: electronics / general

author: cowasaki
author_rank: Frequent Contributor
timestamp: May 27, 2020, 08:47:28 am
content: I've been looking for reasonable rotary switches with 4 poles and 4 terminals to switch 4 signals. I can find lots of 3P4T or 4P3T but the only choice I can find for 4P4T of the cheap Chinese multi plate ones. I've bought these but they have numerous issues - they are completely open causing lots of dirt ingress, they require excessive force to turn, using excessive force bends them causing distortion to the mechanism which in turn means more force before they fail.I have found some at £60+ but I'm looking for under £10 or at least in that region. Also I would like it to not get much larger that the 3x4 and 4x3 ones that fill Ebay.Any ideas/pointers? Preferably with cheap postage or UK
Episodes no longer available at EEVblog.com? - Page 1
Forum section: electronics / general

author: Peabody
author_rank: Super Contributor
timestamp: May 23, 2020, 03:08:02 pm
content: For the last week or so, when I go tohttps://www.eevblog.com/to view the latest episode, I get a black screen saying there has been a Youtube error. Is there a problem with the site, or do I have something set wrong in Firefox. Is it just me?

author: BroMarduk
author_rank: Unknown
timestamp: May 24, 2020, 01:30:43 am
content: I'm getting it too. I even tried deleting my YouTube cookies, which sometimes helps (like when comments won't load), but no joy.

author: cdev
author_rank: Super Contributor
timestamp: May 24, 2020, 01:34:47 am
content: Did you try clearing your cache?

author: theleakydiode
author_rank: Regular Contributor
timestamp: May 24, 2020, 01:38:40 am
content: Have you tried updating firefox?

author: Peabody
author_rank: Super Contributor
timestamp: May 26, 2020, 02:29:19 pm
content: I tried everything I could think of in Firefox, but the problem is still there. It's also there with Edge, so I think that means there's a problem with the site. It's kinda curious that it's gone on this long without Dave taking notice.

author: StillTrying
author_rank: Super Contributor
timestamp: May 26, 2020, 03:40:16 pm
content: I get it in FF, it's only "the latest video", I can just click on and watch the others.WATCH THE LATEST VIDEOAn error occurred. Please try again later. (PlaybackID: bNbrhR6boInSyYbT)Learn MoreSorry, there was a YouTube error.

author: ciccio
author_rank: Frequent Contributor
timestamp: May 26, 2020, 07:43:41 pm
content: Same error, both on Firefox and Chrome.
An "Intersting" You Tuber - Mark Rober - Page 1
Forum section: electronics / general

author: digsys
author_rank: Unknown
timestamp: May 26, 2020, 12:36:54 pm
content: Came across this guy today - has some interesting / funny / off-beat stuff. Spends a heck of a lot of time and effort on many of them !!https://www.youtube.com/user/onemeeeliondollars/

author: SilverSolder
author_rank: Super Contributor
timestamp: May 26, 2020, 02:47:49 pm
content: Yeah he is pretty entertaining. That's 45 minutes I'll never get back!
Smoke Detector Teardown Videos - Page 1
Forum section: electronics / general

author: Deodand2014
author_rank: Regular Contributor
timestamp: October 16, 2018, 01:43:27 pm
content: Big Clive posted a teardown of a cheap smoke detector making use of what he calls the 'ubiquitous 8-pin chip' that was the subject of EEVBlog #1132. The general conclusion was that you should not trust your life to it as there is no low battery warning.He has done two other teardowns over the last three years.This led me to go looking around on YouTube and I found two others.One by Julian Ilett, which was apparently the preview to a review that never happened.And this one from Scotland complete with a test against a 'name brand' detector. Like the one Big Clive tore down it makes use of an 8-pin chip as the controller, and is not something you'd trust your life to.

author: Deodand2014
author_rank: Regular Contributor
timestamp: October 17, 2018, 03:22:12 am
content: Still looking for some more teardowns, strangely there don't seem to be that many out there. Lots of videos on hacking them in various ways and by people who collect them. The teardowns of the cheap Chinese detectors, the two by Big Clive and the one by David McLuckie (The last of the set I posted which compares a 'no name' unit against a Kiddie branded unit.) are the real eye openers, all three use the same 'generic' cover design, but the circuitry is completely different in each.While not a teardown video this one shows AliExpress purchased smoke detectors failing to go off even when smoke is blown directly into the unit. Disturbingly the test button works perfectly. This is similar behaviour to the one in the David McLuckie video.What is not seen is what type of circuit board is being used.

author: Deodand2014
author_rank: Regular Contributor
timestamp: October 17, 2018, 03:11:18 pm
content: I've not found any more fire alarm teardowns (Which is a real surprise given how common they are.). But here are some of the more interesting hacks of smoke alarms (Which is to say they involve something other than adding the ability to send a text message...) I've found.These two involve using the alarm to monitor something other than smoke.The last of them involves adding functionality in a non 'Internet-of-Things' wayFor anyone who is interested the video below covers the delay circuit used in the video above.

author: Deodand2014
author_rank: Regular Contributor
timestamp: December 31, 2018, 09:34:23 am
content: Just located another video showing ebay/AliExpress smoke alarms that seem to be designed only to work if you press the test button...

author: Deodand2014
author_rank: Regular Contributor
timestamp: March 30, 2019, 07:28:28 am
content: Big Clive has torn down a fire alarm using a different principle of operation to detect heat directly. Interesting circuit board too.

author: rayfranco
author_rank: Newbie
timestamp: May 26, 2020, 02:41:25 pm
content: Smoke Alarm Teardowns are at:https://smokealarmexpert.commore on the way.
Question on a AC/DC Electric motor - Page 1
Forum section: electronics / general

author: larrybl
author_rank: Regular Contributor
timestamp: May 23, 2020, 10:06:15 pm
content: Working on a 110V AC/DC motor for a vintage sewing machine, and got mixed results when operating it on ~30V AC and DC. As this has a 2 prong non grounded AC plug, should I modify this to run off of ~100 V DC? I don't think the hi-tech speed controller will care.https://www.youtube.com/watch?v=aale0_4ke7w&feature=youtu.be

author: Benta
author_rank: Super Contributor
timestamp: May 23, 2020, 10:13:00 pm
content: It's just a universal motor. Run it on AC or DC as you want. If you're concerned about safety, add an earth connection to the case.

author: larrybl
author_rank: Regular Contributor
timestamp: May 23, 2020, 11:22:32 pm
content: Thanks! I am worried more about safety.

author: Zero999
author_rank: Super Contributor
timestamp: May 24, 2020, 05:23:23 pm
content: Quote from: Benta on May 23, 2020, 10:13:00 pmThis. Run it from the mains, earth the case and use a GFCI.

author: larrybl
author_rank: Regular Contributor
timestamp: May 26, 2020, 01:13:21 am
content: Ordered a new drive wheel for the motor. Lots of sanding and varnish in the future.
[Apparently solved...]"Kinps" KP-S010 "10,000mAh" power bank with weird symptoms - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: May 24, 2020, 12:07:43 am
content: Hi there.I have had this "kinps KP-S010" 10,000mAh power bank for about 2 years. It's hardly been used. When you plug it in to charge, there's four blue LEDs which indicate charge level - either shown constantly when charging, or remaining capacity is approx. indicated when in use, by pressing the "reset"(?) button (the positions of the LEDs are denoted by red lines in my photo - attached) - it's worked fine for those two years, but when I plugged in to charge, yesterday, NO signs of life whatsoever were exhibited - and now - only the far-right blue LED (near the reset button in the photo) is blinking VERY faintly indeed, and it doesn't seem to be receiving a charge properly.I took the front fascia off, and desoldered the (+) positive wire fron the Li-Poly cell inside to the USB board, left it a few seconds and re-soldered it. It's still just sitting there blinking VERY VERY faintly - I've pressed the "reset"(?) button numerous times, tried myriad micro USB cables and USB power adaptors, to no avail.I noticed, by the way, that there's an IC on the board labelled "SLM6550" which doesn't bring up a whole lot on Google tbh.If anyone can offer some advice as to how to revive this young power bank, I feel it has a lot more life yet to liveThank you! Take care, keep well.

author: eti
author_rank: Super Contributor
timestamp: May 25, 2020, 11:46:20 pm
content: Update:Not to worry kids, it seems to have "magically" fixed itself, having been plugged in most of the evening for the last 2-3 nights; the LEDs are now back to full brightness when flashing, and it appears to be holding charge well. }Thanks for stopping by, have a safe trip home.
Designer softwares and their reliability - Page 1
Forum section: electronics / general

author: mack_30
author_rank: Newbie
timestamp: May 25, 2020, 05:20:44 am
content: While searching for components on TI or any other such big suppliers, I notice that there is a trend that most of them provide "Full product design" tools, wherein you can simply input your requirement and then they list of all possible solutions along with schematic, BOM, PCB designs, BOM and even supplier/distributors list.While designing a couple of products I wonder if I can directly use them and how reliable it is?For eg: can I directly use the SMPS design provided by these SW's.To list a few of the design tools :http://www.ti.com/design-resources/design-tools-simulation/webench-power-designer.html, Power Integrations "PIXls Designer 10.2" and "PI Expert Suite 10.2".Please provide your 2cents on the same.

author: Jeroen3
author_rank: Super Contributor
timestamp: May 25, 2020, 06:00:01 am
content: Those tools match your specification with a collection of application example circuits. You may end up with a circuit that is on the edge of what it can do when given your specs. Which means that it may not work properly when assembled with real world parts or less ideal layout.So use directly, yes. But you still need to test and validate the design.If you want plug&play circuits you should go to traco power or recom.

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: May 25, 2020, 06:12:31 am
content: I had worked at TI for quite a few years and I can comment on some of the webench designs. The specifications given by the user is used to arrive at the design using some optimisation and component iteration. Most of the time it works well as the base design is already validated by TI and the webench uses real world component models and not just approximations.However if your requirements are near the edge of the design specs, then you may need to validate again.
Samples from Analog Design (AUS/NZ) - Page 1
Forum section: electronics / general

author: c64
author_rank: Frequent Contributor
timestamp: May 23, 2020, 05:27:44 am
content: According to this page, samples are available in Australiahttps://www.analog.com/en/support/customer-service-resources/sales/samples_country_availability_list.htmlHowever, when I try to add samples to the shopping card, and choose Australia as a country, it says "Online samples are not available for the country selected". Selecting other country from the list doesn't give the error (mostly, for example New Zealand also not available).Anyone knows what's the issue?

author: c64
author_rank: Frequent Contributor
timestamp: May 24, 2020, 12:08:37 am
content: I tried multiple chips, cheap and expensive. Doesn't matter.
Math book about electronics. - Page 1
Forum section: electronics / general

author: Mazo
author_rank: Regular Contributor
timestamp: May 22, 2020, 07:31:18 pm
content: Sorry if there is a similar topic,tried the search engine but too many results.Anyway: I am searching for a book that has topics about electronics from the math side of things.You know something with a title like "Mathematics applied to electronics"(infact there is a real book with that title which I am considering).I have solid grasp on calculus and basic university level maths in general so the book shouldn't be too basic but neiter too advanced.My idea is to have a read from cover to cover and then use it as a reference when needed.My interests and work in electronics are more in the switching/analog side than the digital domain.Any advice on how you guys upgrade and maintain your math skills is welcome.

author: RoGeorge
author_rank: Super Contributor
timestamp: May 22, 2020, 07:39:17 pm
content: Quote from: Mazo on May 22, 2020, 07:31:18 pmThat will be enough, you won't need more math unless you go into some specific research, but then the extra math needed will be specific to that particular researched topic.

author: Wojciech Krolopp
author_rank: Newbie
timestamp: May 22, 2020, 09:47:01 pm
content: Quote from: RoGeorge on May 22, 2020, 07:39:17 pmI disagree.Calculus is like a toilet seat of math. For digital control systems you need discrete math, logic, group theory etc.
The moment you realise... - Page 1
Forum section: electronics / general

author: NivagSwerdna
author_rank: Super Contributor
timestamp: May 21, 2020, 08:10:09 pm
content: Must have had a brain fade on my last order...How the hell am I meant to solder these on!I wanted 0603... I got..... err.... 0603 !

author: Raj
author_rank: Frequent Contributor
timestamp: May 22, 2020, 07:18:19 am
content: Aren't those 0201?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 22, 2020, 08:09:52 am
content: Yeah, that's what he just said, 0603.Tim

author: Whales
author_rank: Super Contributor
timestamp: May 22, 2020, 08:15:03 am
content: Took me a while, but I checked my reference:Sand. Grains of sand.

author: magic
author_rank: Super Contributor
timestamp: May 22, 2020, 08:32:31 am
content: I once bought some of that rubbish thinking I will be able to solder them. Thank you very much, I'm staying with 0402 and bigger

author: NivagSwerdna
author_rank: Super Contributor
timestamp: May 22, 2020, 09:03:04 am
content: Quote from: blueskull on May 22, 2020, 08:12:28 amI did try this. It didn't work out.
PCB connector for battery (sliding like on tools)? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: May 19, 2020, 01:14:54 pm
content: Hi All,On the pictures is a battery (from a tool). This battery slides on the charger or on a tool. Battery has flat male pins, that connect to the female connector.Are there any PCB mount female connectors that would slide over these "flat pins" (see red circle) (not a clue how that would be called)?Thanks!

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: May 22, 2020, 01:43:56 am
content: Have a dig through here or contact Keystone directly:https://www.keyelco.com/product-catalog.cfm
SSMCX cable needed - Page 1
Forum section: electronics / general

author: w2hx
author_rank: Contributor
timestamp: May 18, 2020, 11:47:56 pm
content: Hello friends,I am not completely sure if this is the right/best forum for me to post my question. Ok, real long shot, here goes.I am in need of a cable a few inches long at least with a right-angle ssmcx connector on one end and something more "normal" on the other end. Dont care what, but like sma/3.5 for example. It is just for troubleshooting, so I just need to mate with the other end and cable quality is unimportant.Here is the picture of the kind of cable I need. The side on the ruler is this SSMCX connector (I believe, please correct me if I am wrong!)https://w2hx.com/x/Harris/RF-310M-HH/Repair%20Pix/0518201908a.jpgAs for the gender, I am not sure what it is called. The cable connector fits within the connector on the board that I am trying to mate with. Is it male? However the center of this cable connector has a tiny socket for a tiny pin to go into. So is it female? Maybe female?here is a picture of what I need to mate with on the pcbhttps://w2hx.com/x/Harris/RF-310M-HH/Repair%20Pix/0518202023a.jpgI am located in the USA and will gladly pay for the cable and postage from anywhere in the world. Any help greatly appreciated! Also interested if anyone can suggest another forum for me to ask for help would also be appreciated.Thank you73 Eugene W2HX
Cheap crimping terminals for prototyping - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: May 17, 2020, 02:15:24 pm
content: I've never used these before, but I think crimping can sometimes help avoid soldering which I'd prefer for just connecting wires to try something out.E.g. I'm looking at connecting 3 wires of different gauges 2 pieces of 30 AWG signle-stranded wire-wounding wire and a multi-stranded piece of mains wire (not sure what gauge it is, but it's rated 15 amps I think).This is just a temporary connection so I don't about long-term connection quality, corrosion etc, just something to replace soldering.I'm searching on Aliexpress and have found thesehttps://www.aliexpress.com/item/4000405143916.html?spm=a2g0o.productlist.0.0.5f0a5cf6ad8kAJ&s=p&ad_pvid=202005170650331296172393015120006450348_1&algo_pvid=af0e1f07-753a-4759-8cc6-a703517a24ff&algo_expid=af0e1f07-753a-4759-8cc6-a703517a24ff-0&btsid=0ab6f82215897234337393644e1cad&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_I suppose this type of terminals should work for me, just need a different gauge, I don't need any screw terminals or connectors, just need to crimp several wires together.Please share if you have experience with this type of crimp terminals if they are any good.Ideally I would buy several different diameters to have handy when needed.I also need a crimping tool for these, so please share which tool you're using to crimp these (will be ordering from Aliexpress or Ebay).

author: Domagoj T
author_rank: Frequent Contributor
timestamp: May 17, 2020, 04:25:22 pm
content: They are ok, work fine. Make sure you put some heat shrink over it.I use this type of crimping tool for ferrules.https://www.banggood.com/0_25-6mm2-Terminal-Crimping-Tool-Bootlace-Ferrule-Crimper-AWG24-10-p-941280.html?cur_warehouse=CNThey are adjustable so you can set it to your wire gauge. When set properly they crimp really strongly.

author: nctnico
author_rank: Super Contributor
timestamp: May 17, 2020, 08:48:55 pm
content: I'd buy ferrules with a plastic jacket. No need to mess with heatshrink tubing. But you have to use ferrules with screw terminals. You can't use ferrules to connect wires together; they are unsafe for this purpose. For crimping wires together you need to use splices:http://www.meyette.us/crimping.htm
Very impressive high-voltage cables - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: May 17, 2020, 08:39:10 pm
content: Solid-dielectric 345KV cables 6.5 miles (10.5 km) long, extruded as single continuous lengths, requiring 10 days:https://www.transmissionhub.com/articles/2012/01/abb-sets-new-power-cable-record-in-new-york-harbor.htmlI didn't even realize that solid-dielectric cables were made for such a high voltage! I thought it would need oil-filled pipe cable.This document has physical and electrical specs for ABB's high-voltage land cables:https://library.e.abb.com/public/ab02245fb5b5ec41c12575c4004a76d0/XLPE%20Land%20Cable%20Systems%202GM5007GB%20rev%205.pdf
Expert for Paintball Marker here? - Page 1
Forum section: electronics / general

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 14, 2020, 11:35:06 pm
content: HiI know its not allows to Import a Paintball Marker to Australia. So I dont know if its ok to talk about that here?If does anyone here know about a Paintball Marker?Thanks

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: May 15, 2020, 02:26:56 am
content: Paintball gun?

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 15, 2020, 10:42:03 am
content: Well in some Country the therm "Gun" is not like to been seen.

author: rhodges
author_rank: Frequent Contributor
timestamp: May 16, 2020, 12:03:49 am
content: I have a Bosch nail gun. It beats hammering nails by hand.I have a drywall texture gun. I don't know how I would apply drywall texture without it.I have a heat gun for shrink wrap on my soap (side business).And I have a paintball gun. It was fun a decade and a half ago.Only a stupid person is afraid of a word.My paintball gun is an Autococker, and I made a remote CO2 line for it. So I had my CO2 tank on my back and had quick reactions. So what is your question, exactly?

author: Lord of nothing
author_rank: Super Contributor
timestamp: May 16, 2020, 12:36:28 pm
content: Which Company produce good Paintball Marker with .68 Cal who allow me to use normal Air to Fire a Round?I need one who allow me to get the max. possible Pressure who is highly avaiable on the Marked.Not that German Rubbish who everyone sale with the "F" Stamp on it. That crap cant ever penetrate a Paperbag.
50 Ways to Hose Your Code - Page 1
Forum section: electronics / general

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: May 16, 2020, 05:04:05 am
content: Recently remembered this classic. To the tune of50 Ways to Leave Your Lover...The problem's all inside your code she said to me;Recursion is easy if you take it logically.I'm here to help you if you're struggling to learn C,There must be fifty ways to hose your code.She said it's really not my habit to #include,And I hope my files won't be lost or misconstrued;But I'll recompile at the risk of getting screwed,There must be fifty ways to hose your code.Just blow up the stack Jack,Make a bad call Paul,Just hit the wrong key Lee,And set your pointers free.Just mess up the bus Gus,You don't need to recurse much,You just listen to me.She said it greives me to see you compile again.I wish there were some hardware that wasn't such a pain.I said I appreciate that and could you please explain,About the fifty ways.She said why don't we both just work on it tonight,And I'm sure in the morning it'll be working just right.Then she hosed me and I realized she probably was right,There must be fifty ways to hose your code.Just lose the address Les,Clear the wrong Int Clint,Traverse the wrong tree Lee,And set your list free.Just mess up the bus Gus,You don't need to recurse much,You just program in C.