hybridfree/eevblog-posts huggingface dataset:
anyone participating in: FTC - First Tech Challenge! 2017 - 2018: Relic Recovery - Page 1
Forum section: electronics / general

author: buck converter
author_rank: Regular Contributor
timestamp: June 30, 2017, 07:09:04 pm
content: Wondering if anyone on this forum is on or mentors a FTC team this year. The re is a new electrical system this year, has anyone got a hold of it yet?have the schematics, tear down orhackingreverse engineering popped up yet?

author: buck converter
author_rank: Regular Contributor
timestamp: August 22, 2017, 11:08:51 pm
content: no nody hear coaching or participating in FTC this year? shame
On Semiconductor Website - Page 1
Forum section: electronics / general

author: calexanian
author_rank: Super Contributor
timestamp: August 24, 2017, 08:46:43 pm
content: Is anybody else having trouble accessing the On Semiconductor website? Anything I click on past the homepage appears to not be working.

author: edavid
author_rank: Super Contributor
timestamp: August 24, 2017, 08:48:32 pm
content: Yes, broken.

author: calexanian
author_rank: Super Contributor
timestamp: August 24, 2017, 09:40:16 pm
content: Thanks.
How do you unsubscribe to a topic? - Page 1
Forum section: electronics / general

author: mrpackethead
author_rank: Super Contributor
timestamp: August 23, 2017, 02:46:05 am
content: A cuple of threads i dont' want to subscribe to any more.. how do i 'unsubscribe' to them.

author: AlfBaz
author_rank: Super Contributor
timestamp: August 23, 2017, 03:11:55 am
content: Depends on what you mean by subscribe.From memory email notifications have the option to unsubscribe within themIf you don't want them appearing in your "Show new replies to your posts" list then over on the far right is an ignore check box

author: MarkF
author_rank: Super Contributor
timestamp: August 23, 2017, 03:32:59 am
content: Where is this Ignore check box? I don't see it. Using IE browser.

author: Mr. Scram
author_rank: Super Contributor
timestamp: August 23, 2017, 03:51:01 am
content: Same here. No check box.

author: MarkF
author_rank: Super Contributor
timestamp: August 23, 2017, 04:13:41 am
content: I do not have an Ignore Checkbox on any lists:"Show unread posts since last visit." or"Show new replies to your posts."I would like to stop threads that I've replied to (NOT subscribed to) from continuing to show up in my "Show new replies to your posts." list.Edit:I would like to stop seeing the posts in my "Show new replies" list. See screen cap. My "Unread posts" list looks the same. No Ignore box

author: tautech
author_rank: Super Contributor
timestamp: August 23, 2017, 05:16:29 am
content: This is how:https://www.eevblog.com/forum/chat/forum-update-new-ignore-topics-feature/msg651768/#msg651768

author: AlfBaz
author_rank: Super Contributor
timestamp: August 23, 2017, 06:06:23 am
content: Quote from: MarkF on August 23, 2017, 04:13:41 amLOL @ screen grablet me guess TEquipment discount thread?It's the only one I've ignoredPM sentPM sentPM sent...

author: mrpackethead
author_rank: Super Contributor
timestamp: August 23, 2017, 07:25:04 am
content: Thankss.. I hope this thread is'nt one of the threads i'll need to ignore. The Irony.
Motorized Fidget Spinner spins itself (How to power rotating motor contacts) - Page 1
Forum section: electronics / general

author: Kedar264
author_rank: Regular Contributor
timestamp: August 21, 2017, 07:23:06 am
content: HiI've hacked an ordinary fidget spinner by adding an motor so it can spin by itselfChallenging part was to power the rotating motor contacts but i solved it with some copper tape must check !This Fidget Spinner Spins Itself forever !!!!!https://youtu.be/zdAI4vkeANE

author: 8086
author_rank: Super Contributor
timestamp: August 21, 2017, 08:48:37 am
content: Next: fidget spinner phone charger?

author: Fungus
author_rank: Super Contributor
timestamp: August 21, 2017, 01:30:53 pm
content: Forever? Or only until the copper tape wears out.

author: Gregg
author_rank: Super Contributor
timestamp: August 21, 2017, 09:04:29 pm
content: Put some coin cells in the three lobes and make a weighted switch that will make contact with centrifugal force of an initial spin and you will be a big hit in the free energy forums. You could even market them.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: August 21, 2017, 10:56:35 pm
content: A little air jet will keep them spinning too. Not in the wheel house of this forum, but even simpler and the only wear problem is the bearings. It will also spin it fast enough to worry about structural integrity and it will spin seemingly forever coming down from there.
USB bluetooth "client" dongle to replace wired solution - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: August 22, 2017, 11:39:25 am
content: Hi all,We have a data logger that allows us to stream data via a wired USB connection onto a PC.Some of our clients would like to be able to use this feature, but without the wire over a short distance (e.g. 1-2 meters).As such, we've looked at potential USB bluetooth alternatives, but it seems all of these require that our data logger acts as "host", which is not feasible with current hardware/firmware.Does some product exit that "acts as a regular USB wire", but via e.g. bluetooth instead - and allows our data logger to act as client?Any help is super welcome!Martin

author: tszaboo
author_rank: Super Contributor
timestamp: August 22, 2017, 11:56:34 am
content: For example Nordic makes a lot of RF chips, which work quite well. Wireless keyboards and such uses them. Like NRF24. You program the two chips (to have the proper USB device protocol, and the other interface in your device), pair them, and ship them, and it supposed to work almost plug and play.

author: tooki
author_rank: Super Contributor
timestamp: August 22, 2017, 01:30:13 pm
content: I think that maybe Bluetooth is the wrong thing to look for. It's a specific standard with specific uses, and probably not suited to this. However, you can get a generic USB-to-IP "hub" that connects to your LAN and then uses a special driver on the PC to see the remote USB port as if it were local. Most of these things have wired Ethernet only, but I did find one company that sells models with WiFi, e.g.:http://www.silexamerica.com/products/connectivity-solutions/device-networking/usb-parallel-connectivity/ds-520an/Edit: P.S. While those things externally look like USB print servers, they're not the same thing. A USB print server will only work with printers (occasionally scanning is supported, too), by presenting as a network printer. The USB-to-IP converters, on the other hand, act as a virtual cable, so that the device drivers don't see the network in between, they just see the USB device as being plugged in locally.
OpenVPN server seeing client's private IP address, then freezing - Page 1
Forum section: electronics / general

author: Delta
author_rank: Super Contributor
timestamp: August 21, 2017, 07:32:02 pm
content: I have openVPN server running at home on Ubuntu Server, this is behind a NAT. I am using a laptop using Ubuntu MATE as a client. The client is connected to a company intranet (tightly managed, I have to clone the MAC address of my company desktop, then connect the laptop in place of the desktop). The link from the worksite is via satellite. UDP is used for the tunnel.Private IP address of client 10.35.235.185Public IP address of client 89.241.122.32Private IP address of server 192.168.0.101The first time I used this, it worked fine. Then the next day when I tried it (without changing anything), it connected and seemed to work fine, but then after a few minutes the connection just seemed to freeze. Everything appeared to still be connected, but I couldn't reach anywhere (even with ping). Then after 120s, the client times-out with inactivity, and the process repeats.Checking the server logs, I see it is correctly accepting a connection from 89.241.122.32:xxxxx, but then after a couple of minutes (coincident with when the link freezes) I seeCode:MULTI: bad source address from client [10.35.235.185], packet droppedIt seems that for some reason the server is receiving a packet marked with the client's private IP address.What could be causing this? I am assuming this is entirely due to something in the company's network, and thus there is nothing I can do about.Why would it cause the VPN connection to freeze?Is there any kind of work around I could do to keep the tunnel working, just have openVPN ignore these dodgy packets?

author: hendorog
author_rank: Super Contributor
timestamp: August 21, 2017, 08:05:42 pm
content: One OpenVPN gotcha I've struck which looks a bit like that is when two connections are using the same cert/key to connect to the server at the same time. Each connection needs its own cert.The other gotcha is when the client LAN has the same IP range as the LAN the OpenVPN server is on, but sounds like that isn't your problem.We are using Untangle firewall which makes the setup much easy.

author: Delta
author_rank: Super Contributor
timestamp: August 21, 2017, 08:21:04 pm
content: Quote from: hendorog on August 21, 2017, 08:05:42 pmYeah, I spotted a warning about that in one of the logs. Not the problem here though as you say. (I've edited my original post to show that)I'll move my home network off 192.168.0.x when I get home....
New House: How to tell which cableoutlet goes to which line? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 20, 2017, 09:38:21 pm
content: I moved into this new house that has about 10 bed rooms. Its less then 10 years old and as far as I can tell;It was built with for cable TV RG6It was later upgraded to a satellite But not sure where the TVs were the wiring has been hacked by Verizon.It was wired for fios a few years ago. TERRIBLE job everything was just hacked apart and rushed. Instead of connectors there are just holes drilled; with eithernet and cables shoved through them. It looks like there was last two TV's.So there is one bed room I want the fios TV to travel down the RG6 up to.How do I tell which cable from the outside goes to the bundle of cables outside the house. Trying to connect a cable box to the room and playing around with cables out side is not really an option because I don't know if the source signal is really working. How would the people that work for the company trace the wires assuming there is nothing hooked up? Almost like I need to do a continuity test with 100's of feet of leads which is not practical.

author: elecman14
author_rank: Unknown
timestamp: August 20, 2017, 09:55:50 pm
content: Cheapest way is to disconnect the cables where they come in at the street. Then Short the copper wire in the middle of the F connector to the outer shell. Then measure the bundle at the other end for the short. If you do this one at a time it would be possible to map the cables. If that seems complicated something like Klein Tools VDV512-058 should do the trick.

author: Beamin
author_rank: Super Contributor
timestamp: August 20, 2017, 10:19:19 pm
content: That's what I was thinking, I didn't want to hack up the cables more but my OCD is going to lead to me redoing that anyways.
Recommendation for 18650-li-ion-batteries - Page 1
Forum section: electronics / general

author: krondor
author_rank: Newbie
timestamp: August 19, 2017, 10:46:46 pm
content: Hello,I am looking to buy a few 18650-type rechargeable batteries.Searching for this type on Aliexpress I get a lot of different brands. Some of them with extremely unrealistic claims of their total capacity (up to 10.000 mAh), some with pretty realistic specifications regarding total capacity.Some brands showing up there would be: Liitokala, PKCell, Nastima, Gvanca, Lomo, BTY, VariCore, MJKAA.I know that none of them are "classic" reputable brands as Sanyo, Pansonic etc.But does anyone have specific experiences with any of these chinese brands? Quality? Life span? etc. etc.I've had a long look at the website lygte-info.dk, but it didn't help me a lot though there's quite a lot of useful info there.Peter

author: senso
author_rank: Frequent Contributor
timestamp: August 20, 2017, 01:01:12 am
content: Get Samsung, Sony or LG for nkon.nl, they are pretty cheap and nkon is a reputable source for original, if not, you might be buying into a house fire or a nice LiPo explosion..

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 20, 2017, 03:46:27 am
content: Here's a discussion of a good deal for 18650s:https://www.eevblog.com/forum/renewable-energy/ebay-seller-with-great-deal-on-lg-18650's/The best 18650s in existence are the ones Tesla uses, but I have no idea where to get just a few. (Group buy part of a Tesla pack and split it up?)

author: MacMeter
author_rank: Frequent Contributor
timestamp: August 20, 2017, 02:41:54 pm
content: Quote from: krondor on August 19, 2017, 10:46:46 pmKnown as "Battery Mooch", specializes in testing batteries and exposing fakes. This link is one place he can be found:https://www.e-cigarette-forum.com/forum/blogs/mooch.256958/

author: fourtytwo42
author_rank: Super Contributor
timestamp: August 20, 2017, 03:34:29 pm
content: Quote from: blueskull on August 20, 2017, 01:06:50 amGood reason to stick to simple old jumpleads(sorry for the offtopic).
Scanner z-lid - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 20, 2017, 04:20:19 pm
content: Oh boy. Bought a new laser printer this morning after being fed up with the 10 minute inkjet ballet that resulted in a blank page.Instead of buying another 30$ Canon ink cartridge (after finding out the 15$ clones are much worse in my printer), I bought a HP color laser, it was 33% off.Why is the lid of the scanner not on an extensible hinge? That was the most clever feature (only one) of my Canon printer; the scanner lid could be pulled up so it presses flat on thick documents.Something similar was on my Canon scanner that I bought a decade ago...So what gives? I looked and looked, and this silly printer (HP M377dw) doesn't have this feature.Is the extensible cover protected by 50000 patents and an army of lawyers?

author: SeanB
author_rank: Super Contributor
timestamp: August 20, 2017, 05:02:31 pm
content: Costs more to make the extra mould parts to do that, and an extra minute in the plant to assemble it, which is a added cost not every user uses. they probably had a "market focus research group" that suggested that users rarely use the platen to make a copy, but almost always use the ADF instead, so cut the extra parts out.
Recycled parts.. mixed feelings.. How do you feel it could be OK? - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: August 19, 2017, 02:31:50 pm
content: Recently Ive gotten a few really great deals on devices that (I could see from their condition) used recycled parts. I am starting to think they have a place in the market.I think vendors should disclose the fact to buyers they are there, also they should never be used in any kind of critical part..As long as its 100% clear that a device uses them, if its also cheaper, and not a critical part whose failure would cause injury or a business stoppage, or similar, I am okay with it, if it can be done safely. (which currently its NOT!)There should be some means of showing that a product uses them, so that people don't buy a device thinking it has new parts when they are used.But, for example, recently I got two DS3231 RCs for my Raspberry Pis. Turns out it seems that they were genuine, recycled parts. Total cost for the two was around $3.Anyway, especially in the educational context, people learning electronics, having access to cheap parts which otherwise would be unaffordable is worth the risk in non-critical settings.As long as it is disclosed upfront.(and it needs to be all the way down the chain) I don't think recycled parts should be used in mainstream products, just ones used for non-critical applications - experimentation, schools, maybe hey could be labeled recycled-"hobby grade" or something.Its similar to getting parts from a car junkyard.. Sometimes its a life saver allowing somebody to get a few more years out a device that would otherwise go into the recycle chain for a dumb reason, lack of one part.Full disclosure is the key to it being acceptable. Recycled parts should never be sold as new.

author: Deodand2014
author_rank: Regular Contributor
timestamp: August 19, 2017, 03:01:35 pm
content: My feelings are much the same as yours, if the part is second hand, recycled, reconditioned or salvage, that status should be made clear to the purchaser, to do otherwise is to put people at risk.

author: Zero999
author_rank: Super Contributor
timestamp: August 19, 2017, 04:11:57 pm
content: It might be difficult selling on places like ebay, as they don't have a category for made with recycled parts. I wonder if labelling the product as refurbished or used, even though it's mostly new, with a few of the more expensive parts recycled would be acceptable?If I bought something described refurbished and found it was new product, made with recycled parts, I'd be happy.

author: cdev
author_rank: Super Contributor
timestamp: August 19, 2017, 08:05:40 pm
content: Exactly,That said, they should also be returnable for replacements or refunds if they don't work as expected.With some more expensive, more useful parts, it seems like insanity to just throw them out when they can have a new life in some other device.What should they sell for? A fraction of what they would cost new.Quote from: Deodand2014 onTodayat 09:01:35
(Solved) Connector type identity or manufacturer please. - Page 1
Forum section: electronics / general

author: Fraser
author_rank: Super Contributor
timestamp: August 18, 2017, 10:02:21 pm
content: I have an unusual I/O connector on one of my thermal cameras (SPi RazIR/Guide M3) and need your help in identifying it please.If I cannot find the plug that mates with this connector I will have to fit a more common type instead. That could be a lot of hassle though.The connector appears to be 8 connections plus screen and similar to that which i used to see on older mobile phones and PCMCIA cards. On the M8 camera the port provides USB and video connectivity.Any comments welcomed.Fraser

author: Fraser
author_rank: Super Contributor
timestamp: August 18, 2017, 11:33:02 pm
content: Hmmm I may have found the connector. It looks similar to one used on a radio scanner.....http://www.danreetz.com/blog/2010/03/07/uniden-bcd396xt-non-standard-usb-cable-and-a-source-of-connectors/It seems to be a 4 pin USB connector rather than the more common 5 pin connector. So not an 8 pin connector after all ? a check inside the camera will prove that. I have to look inside to check the pinout anyway.Fraser

author: Fraser
author_rank: Super Contributor
timestamp: August 18, 2017, 11:38:56 pm
content: The 4 pin mini USB connector

author: Fraser
author_rank: Super Contributor
timestamp: August 18, 2017, 11:47:18 pm
content: There are subtle differences that look to be to stop me using a common 4 pin USB plug. There are a couple of side keyways missing at the top of the connector. I can get around that or fit a standard 4 pin mini USB PCB connector.Fraser

author: Whales
author_rank: Super Contributor
timestamp: August 19, 2017, 12:13:07 am
content: I remember reading something years ago about digital cameras you could borrow for free from a store, but had to return to get things off them. The only way they were enforcing this was through a slightly proprietary USB connector, which you could make from a normal one bought from the same store.

author: Fraser
author_rank: Super Contributor
timestamp: August 19, 2017, 12:40:16 am
content: Whales,It looks to be the case here as well.It appears to be a tweaked version of the Hirose MQ172 series. Datasheet attached.Fraser
Electronics Survey (and Introduction). - Page 1
Forum section: electronics / general

author: Nitrousoxide
author_rank: Regular Contributor
timestamp: August 18, 2017, 02:34:19 am
content: Hi, I thought I would finally start posting on the EEVBlog forums since I've been a long time lurker and figured I should probably contribute and give back to the forum since I've gained hours of entertainment and education from the lovely community, and of course Dave's videos (been watching since episode 7 I think).I'm currently in the 3rd year of my EE degree.Not too sure what else to post in an introductionOn another note, I'm currently undertaking a subject that requires the design and production of an electronics related device. We decided on a system that automatically strips and dispenses wire from a spool, figuring this would be good for the education/R&D department. The whole concept is that instead of buying pre-cut kits of solid core/stranded wire, custom amounts can be produced on demand (saving time and money).Which is where you come in, since its such a niche product this is one of the main places for market research and thus I've produced a survey which would be much appreciated if you spent a few minutes filling out:https://goo.gl/forms/0TnF1ComfPRfnDI02Did I miss anything? Is there anything that I should have added to the survey? Or is there anything else you'd like to say about the product. I would really appreciate the feedback.Thanks for reading!(p.s. I don't know if I put this in the correct section)

author: Gary350z
author_rank: Regular Contributor
timestamp: August 18, 2017, 07:27:12 am
content: Quote from: Nitrousoxide on August 18, 2017, 02:34:19 amWelcome aboard.You should post this here:New Member, Please introduce yourselfhttps://www.eevblog.com/forum/chat/new-member-please-introduce-yourself/

author: Brumby
author_rank: Unknown
timestamp: August 18, 2017, 09:30:52 am
content: The introduction could have been put there, but don't worry about it.The survey part is in the right place.Welcome to the forum.
[SOLVED (for now)] Speex encoder decoder Win32 CLI tools, anyone have working? - Page 1
Forum section: electronics / general

author: Yansi
author_rank: Super Contributor
timestamp: August 17, 2017, 12:45:29 pm
content: Hellojust evaluating a possibility to use a Speex codec in an embedded application.https://speex.org/There are Win32 CLI tools available for download, that would be a very helpful for debugging stuff and generating sample files. However those damned CLI apps do not work. Whenever I try to encode anything, the encoder tells me it starts encoding (or decoding) and then it crashes. Doh!Here is the download link for the binaries:http://downloads.xiph.org/releases/speex/speex-1.2beta3-win32.zipTried on two different computers running W7 x64.Does anyone have any of these binaries actually working? Or what might be the problem?I have only found a brief mention of the problem from May 2009:http://lists.xiph.org/pipermail/speex-dev/2009-May/007223.htmlThank you for help,YansiPS: Supplied you a sample wav file if you dare to try yourself//EDIT: Finally found the 1.0.4 binaries seems to work. Dammit! Sad they couldnt repair the bloody 1.2b3 since 2009...

author: Yansi
author_rank: Super Contributor
timestamp: August 18, 2017, 10:18:25 pm
content: And what did you try to encode?

author: Yansi
author_rank: Super Contributor
timestamp: August 18, 2017, 11:32:38 pm
content: What bitrate and what settings was it at? (codec complexity and quality settings)Can you please upload the resulting ogg?

author: Whales
author_rank: Super Contributor
timestamp: August 19, 2017, 02:37:56 am
content: My understanding is that SPEEX has been completely abandoned in favour of OPUS. That's probably why those builds are broken/out of date.Not sure if it will be any easier/harder to implement on an embedded platform, however.Someone who possibly may have tried.As bad and ancient as MP3 is, you can get dedicated hardware on the cheap to decode it.
Eevblog Wikipedia Page Created - Page 1
Forum section: electronics / general

author: kolbep
author_rank: Frequent Contributor
timestamp: December 23, 2012, 02:34:45 pm
content: http://en.wikipedia.org/wiki/EevblogPlease guys, edit this page, cos I have nothing on it yet, and Wikipedia wants to delete it because there is insufficent stuff on the page

author: Bored@Work
author_rank: Super Contributor
timestamp: December 23, 2012, 03:15:31 pm
content: Bzzzzt.Quote

author: Monkeh
author_rank: Super Contributor
timestamp: December 23, 2012, 03:16:27 pm
content: Perhaps you shouldn't create the page unless you have some content to put in it.That is how this Wikipedia thing works, y'know.

author: EEVblog
author_rank: Unknown
timestamp: August 17, 2017, 11:44:52 am
content: Old thread, but looks like they deleted my photo from the page, claiming a Wikimedia commons copyright issue. Funny, because I took the photo and uploaded it to WikimediaTwo more photos if anyone is interested in fixing it:https://commons.wikimedia.org/wiki/File:David_L._Jones_EEVblog_In_Electronics_Lab.jpghttps://commons.wikimedia.org/wiki/File:David_L._Jones_EEVblog.jpg

author: Cerebus
author_rank: Super Contributor
timestamp: August 17, 2017, 01:21:11 pm
content: Quote from: EEVblog on August 17, 2017, 11:44:52 amOld? If a bit of kit turns up in the mailbag that's as old as this thread you describe it as Vintage.Y'all might want to reconsider that second photo, there's a hint of buck-toothed goofiness to it that: 1) Doesn't represent what you really look like, 2) Just begs for a comedy caption or speech/thought bubble.

author: Cervisia
author_rank: Regular Contributor
timestamp: August 17, 2017, 02:16:57 pm
content: Quote from: EEVblog on August 17, 2017, 11:44:52 amApparently just vandalism:https://commons.wikimedia.org/wiki/User:Daphne_LantierThere does not appear to be a useful history for a claimed copyright violation, so you'll have to re-upload it.

author: Ampera
author_rank: Super Contributor
timestamp: August 17, 2017, 04:18:16 pm
content: Fixed it. I used the first one, as I agree with Cerebus, it does look like you are staring directly into my soul.I clarified in my changelog that you approved the image for use on Wikipedia, so hopefully it should never be taken down.Edit: Right as I say that, it gets taken down by a bot for vandalism, warning me that there was no difference between edits, even though I obviously changed the image over.

author: Ampera
author_rank: Super Contributor
timestamp: August 17, 2017, 04:31:42 pm
content: I made a Wikipedia account and put the image back on. I also reported the bot for a false positive, so hopefully it sticks. I also removed the part about the Visual Inspection Circuit Board.Edit: I added a section on the EEVblog2 and EEVdiscovery channels. I'll pop in ever so often and make additions to the page. There is too little content for this interesting of a channel.
Anybody know what sort of transistor this is 2y - Page 1
Forum section: electronics / general

author: johnh
author_rank: Regular Contributor
timestamp: August 20, 2017, 08:20:25 am
content: Going through some boards that are being tossed.Anybody know what sort of transistor is?I think its from a SDH system.

author: Zero999
author_rank: Super Contributor
timestamp: August 20, 2017, 09:15:39 am
content: What does the board do?It looks like an RF transistor.

author: SeanB
author_rank: Super Contributor
timestamp: August 20, 2017, 09:35:37 am
content: Not RF but there were a few speciality transistors and FET devices that were supplied in that ceramic pill package. Generally Jfets and some dual gate MOSFETS were in those packagers, along with some varicap and PIN diodes.
Interesting video on tin. - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: August 16, 2017, 08:31:53 am
content: Came across this video it shows very clearly how tin grows crystals and self distructs.https://youtu.be/Q9zdt-rOB0Y

author: kg4arn
author_rank: Unknown
timestamp: August 16, 2017, 09:13:15 am
content: Informative. Thanks.
calling bs on 35kw claim - Page 1
Forum section: electronics / general

author: Willy.nebula
author_rank: Newbie
timestamp: August 15, 2017, 06:13:52 pm
content: Calling bs on 35kwhttps://youtu.be/KedsQtPd-poI'm asking the question don't you mean 3.5kw?Is this total bullshit, if it's peak power must be a very short peak before meltingI'm happy to be wrong

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: August 15, 2017, 06:33:24 pm
content: A lot depends on rpm. I would have thought a direct-drive motor that size would develop a good deal more then 3.5kW though. Their power-to-weight ratio is much better than that of old-fashioned induction motors.

author: thm_w
author_rank: Super Contributor
timestamp: August 15, 2017, 08:38:10 pm
content: https://hobbyking.com/en_us/turnigy-ca80-160kv-brushless-outrunner-50-80cc-eq.htmlThis thing is rated 5-10kW, and its not that large (152x133x81mm). Maybe half or a third of the one shown in the video?So I think its definitely possible it was designed to handle 35kW. Whether it could actually handle it without catching fire, I'm not sure (certainly not stationary like that without a fan).The driver circuitry doesn't look that powerful, and was he running it from the wall or some large batteries?

author: ovnr
author_rank: Frequent Contributor
timestamp: August 15, 2017, 09:51:00 pm
content: No big deal to push 35 kW into that BLDC motor. Hell, look at the Tesla Model S motor, which is roughly the size of a watermelon and rated at around 300 kW.Yes, it will need cooling, and no, it won't run like that continuously. Remember, their efficiency tends to be rather high - 97-98% isn't improbable. Say 1 kW lost in the motor windings; it'd still take a while to heat up.

author: peter.mitchell
author_rank: Super Contributor
timestamp: August 15, 2017, 10:27:31 pm
content: It will take 35kw before core reaches saturation, but that isn't a continuous rating by any stretch. Due to its open design and being mounted (likely) in the airstream of a prop, i'd say it can probably do 10kW continuous, I have experience with direct drive hub motors which are just large PMSM outrunners, and if this motor was enclosed, not in the airstream of a prop, it would do maybe 4kW continuous.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 15, 2017, 10:31:33 pm
content: Not BS. Drones and RC stuff in general has a low duty cycle, let's say 15 minutes running time, then 1 hour down time.Of course they all must run with the prop attached for cooling, and yes the power does vary a bit as the batteries discharge.Take a look at ESCs, they're rated for hundred of amps and fit in the palm of your hand. Just my little boat has a 35 amp controller. My silly car has a 80 amp controller. So it's almost trivial to push hundreds of amps these days in places where you don't expect it.My first time dealing with electric RC was like "80 amps through THAT!?" But it works. It's all true!Look at electric helicopters like Align T-Rexexhttp://www.align.com.tw/helicopter-en/trex800/That's a 5KW motor, look at the size.http://www.align.com.tw/ManuaLib/Heli/motor/HML85M03-G20428.pdfSo you must be very happy.
Source for a cheap E/EEPROM burner - Page 1
Forum section: electronics / general

author: Ampera
author_rank: Super Contributor
timestamp: August 13, 2017, 04:15:52 pm
content: I'm planning on going in to old computer kits (the ones you solder together) and I think an E/EEPROM burner would be good so I can write BIOSes and other software onto chips.I see the 30-40USD ones from China, but I don't know if they will work, or if they are a waste of money. I don't need anything fancy, just something that plugs into a USB port (or pretty much anything, I probably have something that supports it) and will write binary files to the PROM. I don't want to spend 100 bucks on one, because I think that is a bit steep for something I may only use 10-20 times in the device's lifespan.

author: Retep
author_rank: Regular Contributor
timestamp: August 13, 2017, 05:01:42 pm
content: If you mean those TL866 programmers you find on eBay (reviewed by Dave:https://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/), my (limited) personal experience is that it will do the job just fine. There is also plenty of information about this programmer to be found on this forum and elsewhere.

author: LaserSteve
author_rank: Super Contributor
timestamp: August 14, 2017, 12:34:45 am
content: I like programming stuff from MCU Mall, because they always host the drivers and software long after the programmer is obsolete.Steve

author: Halcyon
author_rank: Unknown
timestamp: August 14, 2017, 01:14:25 am
content: Quote from: wilfred on August 14, 2017, 12:45:22 amGood point. I use theBatronix BX32Pwhich has very good software support (works with Windows XP through to 10, Linux and OS X). Brand new, they are outside of your stated price range however. Maybe see if you can find a second-hand one on ebay?

author: daybyter
author_rank: Frequent Contributor
timestamp: August 14, 2017, 04:08:49 am
content: Maybe use an Arduino to build something on your own? I did that for mcm68766 eproms.

author: Ampera
author_rank: Super Contributor
timestamp: August 14, 2017, 11:28:52 pm
content: Quote from: wilfred on August 14, 2017, 12:45:22 amLol, this isn't a trouble for me. If it has a USB connector and it works for any version of Windows, I can use it. I could possibly even fudge something onto my Commodore 128 if I needed to.
1979 Exec Predicts Office Of The Future–Email  - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 13, 2017, 02:02:09 am
content: https://www.youtube.com/watch?v=vHOJMGQ3exo#t=7.959406

author: Halcyon
author_rank: Unknown
timestamp: August 13, 2017, 02:15:56 am
content: What an intelligent man. His predictions back then were very well thought out, rather than "pie in the sky" stuff. Bosses like this are rare these days.

author: Dubbie
author_rank: Unknown
timestamp: August 13, 2017, 02:19:57 am
content: That guy was quite prescient. Pretty much nailed the modern corporate office exactly.

author: tooki
author_rank: Super Contributor
timestamp: August 13, 2017, 02:32:35 am
content: Not that amazing a prediction, given that email was already in fairly wide use internally in some organizations by 1970. Only had to look at them to see where th wind was blowing.

author: Halcyon
author_rank: Unknown
timestamp: August 13, 2017, 02:36:45 am
content: Quote from: tooki on August 13, 2017, 02:32:35 amYes, some organisations had their own internal "electronic mail" systems, but it could only deliver messages internally (or to systems connected to theirs). It was largely unrecognisable compared to the e-mail systems we use today. It wasn't until the late 1960's when ARPANET was established, which was basically the birth of the internet as we know today.

author: tooki
author_rank: Super Contributor
timestamp: August 13, 2017, 02:46:20 am
content: I understand that (hence my specific choice of wording above), but my point is that it wasn't some stroke of genius to envision modern email, it was the obvious extension of what was already happening in existing workplaces.

author: ebastler
author_rank: Super Contributor
timestamp: August 13, 2017, 08:17:03 am
content: I actually find the second part of the interview to be the more remarkable one -- where he is not talking about electronic mail, but this new thing called "team work".Makes you realize how much the workplace has changed, not just techology-wise, but also culturally.

author: VK3DRB
author_rank: Super Contributor
timestamp: August 14, 2017, 11:39:36 am
content: Quote from: ebastler on August 13, 2017, 08:17:03 amYes and along came the plethora of useless office speak.Emails would be infested with the word "Team", like "Dear Team, " and cheap shots like "pls" instead of respectful "please", and "ty" instead of the more courteous "thank you". I remember "Show me the metrics!" Also "let's take it off line".The latestspeak is "What is the takeaway from this meeting?". What a wank. One answer is "one cheeseburger and some fries"The bloke speaking was a visionary and unlike the modern day yuppies, he didn't talkto impress people. He knew what he was on about. I wonder who is was and where he is today.
Introduction [ jMrL ] [tech/gamer/cook] - Page 1
Forum section: electronics / general

author: jMrL
author_rank: Newbie
timestamp: August 14, 2017, 10:01:52 am
content: Hello!I wanted to introduce myself and let everyone know I am glad to finally be apart of the eev community. I have watched 85% of the videos and browsed the forum's quite a bit.I am 31 yrs of age. I am a cook by day and a gamer/tech enthusiast by night. I enjoy DIY projects, programming, and design. Implementing my home automation system into a GUI interface for the world to use is my current project as of 3 months. I am using pyqt/pyside to give an interactive feel for the setup. Which will be using tags for easy implementation on the user side. I already have over 20 sensors hard coded into the project that will be as easy as settings a client and then setting a broker no self-code, unless otherwise needed or desired. I have been putting alot of hours into making a DOwnloadable git file for the user to extract and get started having just the ability to upload the sketches and use Linux for a rasperby Pi.That is a little about what I am spending my time mostly doing. Some of my past projects are, leds dimmers, faders, bench PSU, atx 24pin converter, numerous self-made Arduino clones. and a few more. I am a freelancer on a few sites also.Thanks for reading and don't bother holding back on any of my posts. I take criticism as power and harness it as knowledge I learn from others and hope to teach as I do so!Regards,jMrLgg
Electromagnetic Radiation  1961 - Page 1
Forum section: electronics / general

author: richnormand
author_rank: Unknown
timestamp: August 14, 2017, 08:03:39 pm
content: Well that brings back memories.Went down to the basement and found my collection when it was used in the physics course at school in Montreal.Always like the PSSC approach due to its excellent mix of experiments, theory and applied outlook.I wonder how many eevblog people remember it?"Thanks for the memories...."
Good EE calculators (preferably downloadable)? - Page 1
Forum section: electronics / general

author: kalel
author_rank: Frequent Contributor
timestamp: August 13, 2017, 08:49:12 pm
content: I'm curious about some general purpose EE calculators that can simplify calculations and/or help to learn the formulas at the same time (if it displays them, for example).Obviously, the simplest calculator can do everything, but I'm looking for one with built in formulas for various generally useful calculations.Online and downloadable calculators are both useful, but I prefer downloadable if possible (which is less likely these days). In either case, I'd prefer one with more functionality built in rather than using a bunch of different ones.

author: Vtile
author_rank: Super Contributor
timestamp: August 13, 2017, 09:38:40 pm
content: * HP-50g / HP48gx* Xcashttps://www-fourier.ujf-grenoble.fr/~parisse/giac.html* Free42* Droid48 (HP48xx emulator)* NewRPLHP50g / HP48 / (maybe Droid48) engineering programs: hpcalc.org
I just had to laugh - Page 1
Forum section: electronics / general

author: SCase
author_rank: Newbie
timestamp: August 11, 2017, 02:50:29 am
content: I was reviewing some slides for an educational event for middle schoolers and ran across this slide.Wha!?? They had some misunderstandings about electronics as they were implying some whipped up equation to explain how LEDs in series work.I noticed that there was a URL in the slide that said lsdiodes.com. So I went to the source to see what they were peddling and sure enough.....You should probably know how your stuff works before peddling it.

author: xrunner
author_rank: Super Contributor
timestamp: August 11, 2017, 03:00:04 am
content: LOL and resistor(s)?I guess implies if you don't have the correct current limiting resistor value you have to find several to get the right value. I suppose in a pinch ...

author: amyk
author_rank: Super Contributor
timestamp: August 11, 2017, 03:12:21 am
content: Were the slides new and you were part of the approval process, or did you just come across them on the Internet? A preliminary search suggests lsdiodes.com "closed" sometime in 2007...Also found the picture along with a bunch of other BS athttp://wiki.nuigroup.com/How_to_Wire_LEDsandhttp://nuigroup.com/forums/viewthread/1030/(warning, you may not have enough faces to palm when reading that thread...)I guess someone just searched "how to wire LEDs" and, knowing as much about electronics as... someone who would search "how to wire LEDs", just took something from the first few results.

author: Mr.B
author_rank: Unknown
timestamp: August 11, 2017, 03:32:37 am
content: And the question for a 10 point bonus:If there is 3v goingthrougheach LED, calculate the currentacrossthe second LED from the right.Use Maxwell's probability theorem to calculate this…

author: TerraHertz
author_rank: Super Contributor
timestamp: August 12, 2017, 01:00:56 pm
content: "LSD iodes" A self-explanatory company name.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: August 12, 2017, 08:52:07 pm
content: This is the worst kind of mistake. Wrong, but right enough to work sometimes. The times that it works reinforces wrong learning.
Secrets of the universe may lie in an old gold mine in South Dakota - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 09, 2017, 03:12:44 pm
content: https://www.usatoday.com/story/tech/science/2017/08/09/secrets-universe-may-lie-old-gold-mine-south-dakota/534457001/

author: jimdeane
author_rank: Regular Contributor
timestamp: August 10, 2017, 07:52:20 pm
content: Usually if you're around a particle accelerator and you aren't a patient under treatment, being in the path of the particle beam is not a good idea.Here's the "beam path" for the neutrinos as they go into the underground hall at Fermilab. It was implied that they were tired of trying to show people where the path was, so someone grabbed a can of spraypaint and made a mark.For neutrinos, they're so non-interacting with other matter that you can stand in the beam path and feel no effect whatsoever.

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: August 12, 2017, 05:00:02 pm
content: Whoever named that town must've been able to forsee the future need for shielded memory cards, though.

author: Mr. Scram
author_rank: Super Contributor
timestamp: August 12, 2017, 07:46:57 pm
content: Quote from: Homer J Simpson on August 09, 2017, 03:12:44 pmThat shielded box is a thing of beauty. I want one!
The good old days. - Page 1
Forum section: electronics / general

author: Dubbie
author_rank: Unknown
timestamp: August 13, 2017, 10:42:19 am
content: Interesting video from tek about making new-fangled PCBs back in the day.Really makes you appreciate throwing together a layout in an evening and for $15, getting a stack of beautiful boards in the mail a week later.I mean I don't even wear a labcoat anymore!

author: bd139
author_rank: Super Contributor
timestamp: August 13, 2017, 11:28:10 am
content: I still make my own boards with nail varnish, masking tape and a scalpelIt's pretty damn quick. Can kick one before I've fixed the DRC warnings in KiCad.Plus the outcome looks closer to the glorious boards of Tektronix between 1960-1975 ish before all that horrible green solder mask rubbishEdit: video is amazing. Thanks for posting. Will watch the whole thing nowFor the sake of anyone else interested I do the following:1. Draw it 2:1 on graph paper. Red is bottom. Blue is top.2. Drill holes in board 1:1 using a 5mm squared template (close enough to 2.54 unless you're doing big packages)3. Clean both sides4. Cover with Tamiya masking tape both sides.5. Draw the traces on with a lumocolor marker6. Cut the traces with an xacto knife.7. Peel off negative sections8. Paint with shitty black nail varnish and wait for dry.9. Peel off remainig tape.10. Etch11. Clean (IPA and wire wool)12. Tin with crystals13. Win

author: steve30
author_rank: Frequent Contributor
timestamp: August 13, 2017, 12:05:01 pm
content: Fascinating video.That method of doing the board layout looks quite therapeutic.

author: M4trix
author_rank: Frequent Contributor
timestamp: August 13, 2017, 12:27:24 pm
content: Who's the narrator in that video ? Morgan Freeman ? Sounds like him.

author: SeanB
author_rank: Super Contributor
timestamp: August 13, 2017, 12:36:06 pm
content: Sounds more like Leonard Nimoy.

author: georges80
author_rank: Frequent Contributor
timestamp: August 13, 2017, 05:05:29 pm
content: Uni summer work I had in the late 70's I had to design a multiport serial card and then do the PCB layout for the company I was interning at.The layout was on vellum over a grid, 2:1 sized. Using Bishop Graphics tape, red for one layer, blue for the other layer and black would appear on both layers - via photographic process (as well as reduction back to 1:1 for PCB etch/drill etc). Doing an 'edit' involved removing tape and relaying it down... Got tedious if you had a lot to fix - good incentive to better plan the layout.I prefer the much better todays than good old yesterdayscheers,george.

author: mspec
author_rank: Contributor
timestamp: August 13, 2017, 06:19:43 pm
content: I loved the intro music and background music through out the video, they used this style right through this era for videos.I also loved the electric rubber they were using in the first stage of design if they made a mistake lol that's awsum
Where are received Viber files stored on Android device? - Page 1
Forum section: electronics / general

author: MrOmnos
author_rank: Frequent Contributor
timestamp: August 12, 2017, 01:53:34 pm
content: I sent a pdf to my friend via viber. He downloaded it but he is not able to find it? Where are the files stored?

author: tronde
author_rank: Frequent Contributor
timestamp: August 12, 2017, 03:47:08 pm
content: My received files ends up on the external sd-card in the viber folder.
Spontaneous reloads on forum - Page 1
Forum section: electronics / general

author: suicidaleggroll
author_rank: Super Contributor
timestamp: August 11, 2017, 10:32:54 pm
content: I've noticed lately that pages on this forum seem to constantly be reloading themselves on my browsers. On my desktop I'll be sitting there and all of a sudden a fully loaded and idle page's icon will switch to the loading wheel for a few seconds, then stop, then a few seconds later back to reloading, then stop again. On my phone it's worse, as I'll be reading a thread, then out of nowhere it'll pop up a message saying there was a problem on the page and it's being reloaded, at which point it reloads and scrolls me back up to the top of the thread. 10-15 seconds later, after I've scrolled back down and started reading again, it'll happen again, reload, and put me back at the top.Any idea what is going on here? It's been going on for a few weeks now, but it seems like it's getting worse. RAM isn't an issue, phone is iOS on Safari, desktop is Linux with Google Chrome, so completely unrelated OSs and browsers.

author: ataradov
author_rank: Super Contributor
timestamp: August 11, 2017, 10:59:18 pm
content: Ads.

author: Bill158
author_rank: Regular Contributor
timestamp: August 12, 2017, 03:21:43 pm
content: Quote from: suicidaleggroll on August 11, 2017, 10:32:54 pmI am using Mozilla Firefox vers. 54.0.1 with Win 10. I noticed this also a while back so I looked for an "addon" from Mozilla. They had a program "UBlock Origin" vers. 1.13.8 which allows you to block a site from sending you ads. I found that there were two sites were doing all of the dirty work.sdk.steamrail.comf.steamrail.comSo I entered those to block and the annoying and unwanted ads stopped. I don't know why these sites are only attacking while on EEVBLOG. My solution, good luck.Bill