hybridfree/eevblog-posts huggingface dataset:
Digikey search - Page 1
Forum section: electronics / general

author: limata
author_rank: Contributor
timestamp: November 24, 2020, 05:39:03 pm
content: I found that Digikey parametric search is becoming so difficult to use. Most time it didn't return any results although the part is there. A lot of parts are lack of footprint or 3D model. It usually is my first stop for component search. I am using Mouser more and more even Mouser is not perfect.

author: tooki
author_rank: Super Contributor
timestamp: November 24, 2020, 07:38:58 pm
content: https://www.eevblog.com/forum/chat/digi-key-has-changed-and-it-is-not-very-good/

author: ataradov
author_rank: Super Contributor
timestamp: November 24, 2020, 08:01:18 pm
content: Yes, I just switched to Mouser. It works so much better and faster than DK.The only really annoying thing is inability to sort by price at a certain quantity. For some categories price for a single unit varies a lot from the price in quantity, especially between multiple vendors. Some are more elastic than others.

author: limata
author_rank: Contributor
timestamp: November 24, 2020, 11:45:35 pm
content: Glad I am not alone.
Scope probe 3D printed tip covers - Page 1
Forum section: electronics / general

author: nuno
author_rank: Frequent Contributor
timestamp: November 29, 2020, 01:37:23 am
content: I don't know if that's the name, I just call it tip covers.When I needed to probe tight places and assembled a protector, it usually made my life more difficult because the standard ones make the probe larger diameter and I always ended up bumping into something or not fitting, so I stopped using them. And they're also easy to loose, of course. Then I designed this slicker one. What do you think? The one in attach is for Rigol RP2200 probes (DS1104Z, probably the others too).They're a bit tricky to print (at least for me), but doable. Depends on your slicer. This is designed to use the spiral mode, and I print it at 0.12mm Z step with a 0.4mm nozzle. In some slicers it helps to put the number of bottom and top layers to zero.p.s. Changed the name from "protector" to "cover", sounds more adequate.p.s. Now here, with more info and design files:https://www.thingiverse.com/thing:4669269. They are parametric, so you just need OpenSCAD and change some measurements in a file to fit your probes; I can help with that if needed.

author: tautech
author_rank: Super Contributor
timestamp: November 29, 2020, 07:03:37 am
content: Probe condoms.You need post about your 3dp model here:https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/
Motorcycle "RFID" HITAG2 key emulation with microcontroller - Page 1
Forum section: electronics / general

author: kilohercas
author_rank: Regular Contributor
timestamp: November 22, 2020, 07:53:33 am
content: Hello, My understanding that in this forum where are few smart people, and I need your helpI am making system for my motorcycle that could capture and replay emergency RFID key that is used to start motorcycle once. So basically I would be able to start my motorcycle with phone if my key get stolen or lost.So I was probing excitation coil on my motorcycle by directly attaching scope to it. I was able to capture unlock signals, problem is, this is not what I expectedProblem is that signals are the same amplitude. IF RFID tag is re transmitting signal, it should be lower amplitude, not 60Vpp, while if it shorting magnetic field, Modulation should not go to zero.So question, how does communication is working, and why I can't see it in scope?

author: Miti
author_rank: Super Contributor
timestamp: November 22, 2020, 01:13:08 pm
content: I think that’s pretty much a perfect capture of the communication between the exciter and the card. You’re on 10V per division on the scope so probably it doesn’t go to zero, but by shorting the coil in the card, you throw everything out of resonance and the peak voltage on the LC should drop significantly, depending how close the card is.Edit: Make a coil, connect the ends together, and move it close to the exciter. See how that changes the amplitude.

author: kilohercas
author_rank: Regular Contributor
timestamp: November 23, 2020, 04:28:35 am
content: That's the problem, shorting field with loop does not effect much exciter amplitude capturedAlso if I place key further from coil, amplitude remains the same.This is why it is puzzling me...
Forum Question - Page 1
Forum section: electronics / general

author: Microdoser
author_rank: Frequent Contributor
timestamp: November 23, 2020, 11:07:58 am
content: Wasn't sure where to ask a question about using the forum, so I will post it here.Is there a way to remove a topic from the 'Show new replies to your posts.' list? I have checked profile settings etc but can't find a way.I would rather that it was a list of posts where someone actually clicked 'reply' on one of my posts but instead, it is just threads that I posted in once that have new replies. Some of these threads have many replies daily and I would like to not be notified of that.

author: Ice-Tea
author_rank: Super Contributor
timestamp: November 23, 2020, 11:12:33 am
content: Above the topic list you have the 'ignore topic' button and a checkbox next to each topic .

author: tautech
author_rank: Super Contributor
timestamp: November 23, 2020, 12:56:45 pm
content: Ignore topics originally wasn't enabled by default however for the more recent members it may be IDK.You may have to do some tweaks to profile setting to make it work and they are listed in this thread:https://www.eevblog.com/forum/chat/forum-update-new-ignore-topics-feature/

author: Simon
author_rank: Unknown
timestamp: November 24, 2020, 05:15:33 pm
content: ignore topic button or just ignore the notification email. You won't get another for that topic until you visit it so you are effectively unsubscribed then.
video: How to fix tech problems without a baseball bat - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: November 21, 2020, 12:10:04 pm
content: He's saying that when the computer doesn't work, don't get angry, walk away and do something else while you think about what is wrong with the computer.I say bah! Good old fashioned printer rage is cathartic. Nuts to him!What do you think?

author: Microdoser
author_rank: Frequent Contributor
timestamp: November 21, 2020, 12:35:04 pm
content: I often find the repair solution is heavily dependent on the budget.If you have a large budget, take a bat to the thing and order a new one.Medium budget, replace random parts until it works again.Tiny budget, do an in-depth analysis, find out the actual problem. In most cases the problem is software related or user error, then remove the problem software and update your drivers to fix it then don't repeat whatever you did to cause the problem in the first place. If not, replace the only part that has failed.
Connector wanted. - Page 1
Forum section: electronics / general

author: zoltan
author_rank: Contributor
timestamp: November 22, 2020, 09:29:02 am
content: Hi!Anyone recognizing this connector? The image is borrowed from Ebay, I don't have any connector at hand to check if there is any marking on it.It is descibed as Grundfos MS4000 compatible.
RUSSIAN CYBERPUNK FARM - Page 1
Forum section: electronics / general

author: S. Petrukhin
author_rank: Super Contributor
timestamp: November 20, 2020, 09:30:15 pm
content: https://youtu.be/jjB26jzwtUM

author: eti
author_rank: Super Contributor
timestamp: November 20, 2020, 10:11:30 pm
content: Quote from: S. Petrukhin on November 20, 2020, 09:30:15 pmВесело. спасибо большое
Changing shape of disti land (in europe) - Page 1
Forum section: electronics / general

author: engineer_in_shorts
author_rank: Regular Contributor
timestamp: November 20, 2020, 10:53:03 am
content: Hi,Not sure how many folk have seen this. TI has ended distribution agreement with Avnet/Farnell:https://distributor.electronicspecifier.com/ti-ends-avnet-distribution-relationship/I know my company (in UK) certainly buys quite a bit of small quantity stuff from Farnell. Farnell in the UK has certainly been a good online all rounder. Easy to search, good stock and lines, delivery is quick. In my experience Mouser, Digi key have better stock but takes 3days delivery, RS does not have as many lines/stock and is not quite so easy to search but fast delivery. But overall I think we all just search all 4 for typical parts.Personally I find fast n cheap delivery useful as a developer, you just don't need to have boxes and boxes of parts, and plans can change quickly.As the article above indicates, TI is quite a chunk of income for avnet group, does this signal the start of start of changes to distis in Europe? Or is this more TI retreating?

author: 2N3055
author_rank: Super Contributor
timestamp: November 20, 2020, 02:25:06 pm
content: In continental EU, I already get stuff from Mouser Italy, and in pretty much same time frame as Farnell.Farnell also opened large warehouse in France, and might start serving continental EU from there more and more.As for TI and Avnet, I think it might be something else. Just few days ago I received email from TI that I can buy directly from TI Europe..Even small quantities.. They also offer company credit lines...So they might be trying to not having a need for distributors at all, or at least much less....

author: magic
author_rank: Super Contributor
timestamp: November 20, 2020, 04:47:46 pm
content: Seems they drank the vertical integration kool-aid.I could swear there was a thread about it already, they are cutting ties with distributors all over the place and contracting DigiKey (IIRC) to handle their small volume sales in the US, under TI brand.Similar thing in Europe?

author: engineer_in_shorts
author_rank: Regular Contributor
timestamp: November 20, 2020, 05:10:20 pm
content: Ah yes, i have re-read the PR and it seems more like TI want to be there own disti.....

author: Benta
author_rank: Super Contributor
timestamp: November 20, 2020, 07:01:42 pm
content: Erm, all this happened over a year ago.

author: engineer_in_shorts
author_rank: Regular Contributor
timestamp: November 20, 2020, 08:25:25 pm
content: Quote from: Benta on November 20, 2020, 07:01:42 pmohhh yeeeaahhMODS: please delete this thread
SpaceX Crew Dragon launch tonight (Sunday) - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: November 15, 2020, 11:30:37 pm
content: Just a reminder: liftoff scheduled for 7:27 PM EST.https://www.nasa.gov/content/nasas-spacex-crew-1-mission

author: AlbertL
author_rank: Regular Contributor
timestamp: November 17, 2020, 01:32:35 am
content: Docking with the ISS is scheduled for 11:00 PM EST tonight - can be viewed on the link above.

author: mawyatt
author_rank: Super Contributor
timestamp: November 17, 2020, 01:49:50 pm
content: BTW the night launch was a beautiful site between the clouds from where we are in Clearwater Florida USA, which is on the west side of Florida and the launch is on the east side at Cape Kennedy Space Center.Nice SpaceXBest,

author: AlbertL
author_rank: Regular Contributor
timestamp: November 19, 2020, 02:42:16 am
content: But those goofy space suits have *got* to go.On the plus side, one guy in the SpaceX mission control center was wearing a white shirt and a tie. Now if they could just get some Apollo-era consoles in there instead of those computer monitors that make the place look like a Wall Street bond-trading room.
Question about some kind of switches - Page 1
Forum section: electronics / general

author: Antok602
author_rank: Newbie
timestamp: November 15, 2020, 09:34:26 pm
content: Hi all, i am trying to understand some kind of switches i found regularly. It s not like 0 or 1 when pressed, but i can measure in diode test i. e. 0,928v when is off and 0,258v when is on. In this way the ecu can see if wires are damaged. How is made internally and how can be simulated or bypassed?Thank you

author: Infrared_Fred
author_rank: Regular Contributor
timestamp: November 16, 2020, 02:41:07 pm
content: Can you provide some details as to what these switches are in (i.e. are they little tactile switches, matrix switches as in connected to a microcontroller or something similar, part of a keyboard or keypad, etc.)?Thanks!

author: thm_w
author_rank: Super Contributor
timestamp: November 16, 2020, 10:33:58 pm
content: Is its 0.9V in both directions or just one?You can take three schottky diodes in series, then place a normal switch to short across two of them to get this sort of result.
Information requested: automatic flashlight/torch - Page 1
Forum section: electronics / general

author: Connecteur
author_rank: Frequent Contributor
timestamp: November 20, 2020, 04:20:16 pm
content: Does anyone know of an automatic flashlight/torch that incorporates both a motion sensor and a light sensor? It would turn on in dark conditions when it detects movement. It would not turn on in a dark pocket, nor would it turn on sitting on a shelf, or in a dark drawer.Seems like an excellent idea. I'd build one myself, but I'm not good at building micro-circuitry or programming microcontrollers.

author: DmitryL
author_rank: Regular Contributor
timestamp: November 20, 2020, 04:54:11 pm
content: What's wrong with off-the shelf simplest PIR modules ? Search on ebay for "PIR module" and you'll find thouthands of them. Their schematics is pretty simple and well documented.Yes, I made several MCU-controlled PIR modules with light sensors and LED drivers, but I needed programmable LED fade In/Out rate (smooth On/OFF), programmable ambient light level, re-triggering when it is ON and motion is detected, and other bells and whistles.BWT, it will be constantly turning ON in your pocketBecause it is dark there and constant changes in IR ambient picture

author: Connecteur
author_rank: Frequent Contributor
timestamp: November 20, 2020, 05:55:11 pm
content: Quote from: DmitryL on November 20, 2020, 04:54:11 pmCorrect, so it would need a proximity sensor to detect being in a pocket.

author: RenThraysk
author_rank: Regular Contributor
timestamp: November 20, 2020, 08:14:42 pm
content: Not aware of one.There are non contact controlled lights, those are mainly headlamps, so don't have to fumble with buttons whilst gloved.There are emergency flashlights (IKEA has the Fryele) that are meant to be plugin into mains constantly to keep the battery topped off, and which light up if the power goes out.If the problem is locating the flashlight in the dark, then there are flashlights with moonlight or firefly modes.Zebralight is one manufacturer that makes lights that go down to around 0.05lm, which has so low draw that a single charge on a quality 18650 can power it for 4 months or something.So never really need to turn it off at night.

author: Connecteur
author_rank: Frequent Contributor
timestamp: November 20, 2020, 09:10:05 pm
content: It seems like a fun project. A flashlight that would light up when you approached it and continued to stay on while you moved it. A proximity sensor would prevent it going on when it's being transported in a bag or pocket.

author: ebastler
author_rank: Super Contributor
timestamp: November 20, 2020, 09:14:19 pm
content: Quote from: Connecteur on November 20, 2020, 09:10:05 pmOr you could take it as far as adding a switch...
Electrician to engineer - Page 1
Forum section: electronics / general

author: pcarr1776
author_rank: Newbie
timestamp: November 14, 2020, 06:03:26 am
content: Apologies if this is the wrong place to post this...I have been an electrician for 17 years ( in the U.S. NM/TX border region ). I started out as a data tech and worked my way through an electrical apprenticeship. My skill set includes everything from voice/data to MCCs. I am half way through an electronics engineering degree ( the closest thing to an electrical engineering degree available in my location ). My question is this; is there a career path that includes the skill set I already have or should I be expecting to start over? Is there such a thing as an engineering apprenticeship?

author: Simon
author_rank: Unknown
timestamp: November 14, 2020, 08:10:53 am
content: Find a job in a company that you can progress in.

author: VK3DRB
author_rank: Super Contributor
timestamp: November 14, 2020, 11:47:01 am
content: Don't underestimate the value of prior experience. Keep going with the electronics engineering degree. You will not regret it. The 17 years experience is very valuable. You would be surprised how much experience of the real practical world will give you a big edge over fresh graduates. In fact, I have found the best engineers are generally those who have been technicians with practical experience.The contrast is stark when you get an industrial designer or mechanical engineer with no prior technician experience. Serviceability is generally the last thing on their mind unfortunately because they have no experience servicing equipment. Similar with electronics. An electronics engineer who designs a PCBA without any ground test points, or who does not think there is any value in back annotating (resulting component designators sequentially near each other on a PCB), means he and those reviewing his work have probably never worked as debug or service techs.Hey, before electronics engineering when I was at high school, I worked in Children's Shoes Department at a major retailer (the Aussie equivalent to similar to the US Sears, Roebuck & Co) fitting shoes on kids, doing stock etc. Even though I hated the job, I liked the money and it taught me life skills I otherwise would not have had. Later, I fixed TV's and videos on the side whilst working as an engineer - the experience fixing VHS, Beta VCRs and PAL picture tube TVs was invaluable.Good luck with your bright future.
Handshake protocol origins - Page 1
Forum section: electronics / general

author: Unixon
author_rank: Frequent Contributor
timestamp: November 07, 2020, 11:38:44 pm
content: Historical question: when and how 2-phase and 4-phase handshake protocols first originated in electronics?

author: helius
author_rank: Super Contributor
timestamp: November 10, 2020, 12:38:07 pm
content: Ithinkyou're referring to flow control ("2-phase") and arbitration ("4-phase")?I'm not sure at all when they were first developed, but flow control has to be very old. Digital teleprinters came in the late 1800s or early 1900s as an outgrowth of the telegraph. In telegraphy, there were conventional ways of letting the other party talk ("Over" or "Go Ahead" were abbreviated with special morse codes). In a two-way teleprinter circuit, that kind of convention could be used to switch access to a shared circuit. Later on with modems flow control was accessed using RTS (ready to send) and CTS (clear to send) signals.Arbitration is needed for multi-master access to shared media, which includes computer buses and also things like Ethernet. Again I don't know the order of discovery, but the IBM 360 definitely had a form of arbitration for its channel architecture and most other large computers of the 1960s had similar features.

author: Unixon
author_rank: Frequent Contributor
timestamp: November 10, 2020, 02:57:15 pm
content: Quote from: helius on November 10, 2020, 12:38:07 pmI was referring to methods of organizing flow control in asynchronous circuits design.This is often mentioned in literature as "2-phase bundled data" and "4-phase bundled data" conventions.https://static.docsity.com/documents_pages/2013/03/17/874400db135e3b94cf39d492e412b844.pngMy attempts to trace origins showed that earliest published works that at least resemble the idea are somewhere between works of David E. Muller in 1954 and Claude Shannon in 1939.
notifications when getting replies to posts. - Page 1
Forum section: electronics / general

author: m3vuv
author_rank: Super Contributor
timestamp: November 08, 2020, 04:53:18 am
content: hi all,when ever i post here i click the notifiy me of replys,how is it supposed to work as i never get them,even when a reply has been posted! any ideas?.

author: AndersJ
author_rank: Frequent Contributor
timestamp: November 08, 2020, 06:40:04 am
content: Perhaps your email adress is misspelled in your user profile.

author: S. Petrukhin
author_rank: Super Contributor
timestamp: November 10, 2020, 02:04:59 am
content: Quote from: m3vuv on November 08, 2020, 04:53:18 amOr your mail provider, your antivirus or any other protection system blocks messages from the forum. Look at the "spam" folder in your mailbox.
CRT tv repair Diode question - Page 1
Forum section: electronics / general

author: dmoore11
author_rank: Newbie
timestamp: November 09, 2020, 08:47:06 pm
content: Hey guys, I am attempting to repair a monitor chassis on a 1987 19" Emerson TV and have found a bad rectifier diode. I found the schematics on-line and it designates this diode as DFD05G. No other specs and having difficulty in finding info/replacement. Any help will be greatly appreciate. - D

author: wraper
author_rank: Unknown
timestamp: November 09, 2020, 09:07:38 pm
content: datasheet attached. look for DFD05TG specs

author: floobydust
author_rank: Super Contributor
timestamp: November 09, 2020, 09:17:10 pm
content: DFD05G crosses to a 1A 600V 200ns fast recovery rectifier diodeNTE552or 1N4937. I think a UF4007, MUR160 would also work.edit: if the rectifier connects to the flyback transformer for a scan-rectified power rail, check components downstream like capacitors etc. for shorts that would have caused the diode to fail in the first place.
5x20 fuse holder insertion - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: November 08, 2020, 03:19:17 pm
content: For the leaded fuse holders on the screenshot how to you actually insert a 5mm fuse into 2 of these?It doesn't fit because one of the holder's inner dimensions is 4.9mm and the fuse is 5.2mm.Are these just wrong holders or is there a tool to insert these bending the holder for a tight fit?

author: Benta
author_rank: Super Contributor
timestamp: November 08, 2020, 06:54:19 pm
content: The fuse is 5.2 mm? Then why would it be called a 5 x 20 fuse?You'll find that the fuse is 5 mm. The receptacle is 4.9 mm, but due to its shape spring loaded.No mystery here.

author: Axk
author_rank: Regular Contributor
timestamp: November 08, 2020, 07:48:12 pm
content: I see, I thought 5mm was a standard where the actual diameter is 5.2mm, didn't know there were 2 different standards.

author: PushUp
author_rank: Regular Contributor
timestamp: November 08, 2020, 10:20:39 pm
content: Although it fits, it is still a bit fiddly to operate - at least for me:I find it helpful, to put a rubber band at the end of the grip and work around in circle - one fuse holder after the other:Most likely there is a special tool for it, but as I don't need it so often, I am happy with this way. However, I am open for any cheap solution to improve!

author: sleemanj
author_rank: Super Contributor
timestamp: November 09, 2020, 07:01:48 am
content: Quote from: PushUp on November 08, 2020, 10:20:39 pmBuy a bag of axial fuses? :-)

author: Gyro
author_rank: Super Contributor
timestamp: November 09, 2020, 06:32:52 pm
content: Quote from: sleemanj on November 09, 2020, 07:01:48 amAgreed. You have to desolder the end caps anyway in order to prise out the old fuse and replace it, there's too much stress on the PCB traces and joints otherwise. The second fit will never be as tight (possibly too loose) either.

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: November 09, 2020, 07:36:04 pm
content: Put your fuse in the liquid nitrogen and heat the fuse holder with a blowtorch

author: Alti
author_rank: Frequent Contributor
timestamp: November 09, 2020, 08:09:57 pm
content: Quote from: Axk on November 08, 2020, 03:19:17 pmWere these IEC 60127 fuses?If these were safety rated, modifying fuses in any way is not allowed.You must not solder fuses, open them, rewire, paint, stick a radiator on, etc.All that might change their characteristics and impair safety.I'd say squeezing those in a vice is a modification that fuse manufacturer did not test for.It is true some fuses come as leaded versions but these are not raw fuses with caps pressed in but separate products with separate testing and approvals as whole unit after it has been assembled. I'd say that chopping off leads from leaded version also qualifies as modification, even if you can technically squeeze that into a fuse holder.
3-D printed micro swimmers - Page 1
Forum section: electronics / general

author: DrG
author_rank: Super Contributor
timestamp: November 09, 2020, 12:13:44 am
content: https://pubs.rsc.org/en/content/articlelanding/2020/sm/d0sm01320j#!divAbstractNot that I understand this all that much, but that little tugboat is pretty cool!

author: CatalinaWOW
author_rank: Super Contributor
timestamp: November 09, 2020, 01:16:04 am
content: Anyone who has ever dropped a small part on the floor can only chuckle at the line in the paper which states that (paraphrasing) "a large portion of the microprinted figures are lost during recovery from the manufacturing bath"

author: Brumby
author_rank: Unknown
timestamp: November 10, 2020, 07:21:59 am
content: Quote from: DrG on November 09, 2020, 12:13:44 amThat 'tugboat' is called a Benchy.It is a classic test piece used to test many of the challenges faced by 3D printers. Mind you, they aren't usually that small.

author: DrG
author_rank: Super Contributor
timestamp: November 10, 2020, 02:50:18 pm
content: Quote from: Brumby on November 10, 2020, 07:21:59 amI stand educated as you are correcthttps://en.wikipedia.org/wiki/3DBenchyIt is unfortunate that the Benchy was not on the list of possible replacements for the battleship in Monopolyhttps://www.thesun.co.uk/living/2585074/original-monopoly-pieces-thimble-vote/It would definitely have received my vote.
[Video]: World's fastest pitch - supersonic baseball cannon - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 07, 2020, 02:32:31 am
content: Behind the scenes:

author: BrianHG
author_rank: Super Contributor
timestamp: September 07, 2020, 04:07:38 am
content: Man............I wonder how much all of that costs?Pathetic MLB ball, cant even survive hitting a steel plate at Mach 1.3.

author: Refrigerator
author_rank: Super Contributor
timestamp: September 07, 2020, 08:51:57 am
content: I wonder how much they'd gain if they used helium instead of nitrogen.

author: SilverSolder
author_rank: Super Contributor
timestamp: September 07, 2020, 01:36:21 pm
content: Awesome, the world is beautiful just for having crazy guys like this in it!Anyone know what that cool machine was, that they used for making the graphics on the control panel?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 07, 2020, 02:55:22 pm
content: Quote from: BrianHG on September 07, 2020, 04:07:38 amI'd guess, ballpark (pun intended) around an annual salary. Give or take if the guys are contracted or volunteer, and just how much material and machining cost went into it (did they volunteer their own machines, or contract out to a CNC house?).With 8M subscribers worth of YT bux and Patreon supporters, that sounds very plausible.I'm rather concerned that he never mentioned hydrotesting it. 750 PSIgaswas the first and highest pressure it'd been brought up to?Tim

author: Refrigerator
author_rank: Super Contributor
timestamp: September 07, 2020, 03:09:07 pm
content: Quote from: T3sl4co1l on September 07, 2020, 02:55:22 pmI was also surprised when he said 750 Psi without mentioning any prior testing, but they seem competent enough so i'd give them the benefit of the doubt.Quote from: T3sl4co1l on September 07, 2020, 02:55:22 pmI think i saw somewhere that a youtuber by the name of MisterBeast spent about 10 million last year.So i think they had a couple bucks to spare.

author: eti
author_rank: Super Contributor
timestamp: September 07, 2020, 04:01:40 pm
content: I've added the "behind the scenes" video.

author: daqq
author_rank: Super Contributor
timestamp: September 07, 2020, 06:42:29 pm
content: Now build a second one and we'll have the Large Baseball Collider!

author: Tom45
author_rank: Frequent Contributor
timestamp: September 07, 2020, 09:07:37 pm
content: Quote from: T3sl4co1l on September 07, 2020, 02:55:22 pmThe first test at the shop shown in the video was 300 psi. When they were set up out in the field they were planing on 750 psi but while pressurizing the vacuum was dropping, so they fired at somewhat over 500 psi.His day job is developing and testing weapons, apparently at the Redstone Arsenal. So he seems quite qualified to design, build, and test devices like this.

author: BrianHG
author_rank: Super Contributor
timestamp: November 13, 2020, 01:00:31 pm
content: Lousy human spine, can't even stop a supersonic pitch.Cheap gloves, they evenignite in flameswhen trying to stop a supersonic baseball...
TIM (Tag based Inventory Management system) - Page 1
Forum section: electronics / general

author: pknoe3lh
author_rank: Regular Contributor
timestamp: August 19, 2019, 06:24:44 am
content: HiHow do you manage your parts at home?I'm not talking about production or point of sales IMS .... Just organising you parts in your workshop.I'm starting to get problems that I lose overview about what I have lying around.I was looking for a solution but I did not want to use Excel ... I want something also working on the go ...This is my solution:https://storage.im-pro.atI wrote an instructables about it:https://www.instructables.com/id/TIM-Tag-Based-Inventory-Management-System/I also have an tutorial video:https://youtu.be/JefecAt33rkI hope it is also useful for someone else ...

author: Renaud
author_rank: Newbie
timestamp: November 09, 2020, 11:37:08 am
content: It's a nice and simple way to manage any kind of parts.It's a shame there doesn't seem to be a good thread about part management.It seems a few -like you- have done their own thing to answer their needs but I haven't found an electronic part oriented system yet that really includes all the useful things I would like one to do.At any rate, your system looks pretty good for general hobbyist part management. Thanks for sharing it!
Help identifying a connector - Page 1
Forum section: electronics / general

author: Deodand2014
author_rank: Regular Contributor
timestamp: November 09, 2020, 08:56:01 am
content: I've got a free USB connector on my computer labled F_SSUSB1 (The blue one in the attached image.) and I'm not sure what type of USB header cable needs to attach to it. I'm hoping to use it for additional ports at the rear of my computer.Can anyone help by identifying it and providing the specs of what equipment fits into it?

author: PlainName
author_rank: Super Contributor
timestamp: November 09, 2020, 10:16:22 am
content: It would help if you said what motherboard it is, then it's a simple matter of looking up what it is in the manual. Offhand I would suggest a 20-pin USB3 job and probably a standard interface.
Antique Sony 6RC 23 AM Clock Radio Restoration - Page 1
Forum section: electronics / general

author: jcrubin
author_rank: Frequent Contributor
timestamp: October 24, 2020, 12:32:41 pm
content: I'd recently picked up this Sony 6RC 23 for my mother who had had this exact model back when. There aren't too many out there and most are in bad shape when they appear. This was from Sony's early days, finding one in good cosmetic shape was lucky enough. Weather or not it worked came secondary. As far as good looking and broken goes, this win from Ebay didn't disappoint.Cosmetically pristine with the exception of the broken bottom switch; the flipped bezel and missing screws told me someone who should not have been in this radio was here, and there would be more surprises to come. Visual inspections inside showed nothing exceptional, though when powered on, the clock had no movement, and this concerned me. The radio functioned, albeit barely.A complete disassembly was conducted to reach the clockwork, testing the motor itself for continuity. Sure enough, there was none. Luckily, it appeared that it was just a broken end lead of the coil that required repair. Cleaned oiled and reassembly of the clockwork showed that this portion seems to restored to working condition.With the clock fixed the project moved towards the broken knob, made from a turned down marker knob, sized and fit over the old stem with epoxy. This is then checked once dry against the inner plate and bezel. At this point, the clock mechanics are reinstalled back into the chassis along with the rewired transformer.The volume knob is an easy fix requiring just some deoxit and cleaning. The tuning knob seems far worse, ill have to source the capacitor. While waiting on the new tuning cap, the front arms bezel and face are reinstalled, the hands calibrated. The outer bezel trim is also repainted with white paint.When the new caps arrive, the old one is carefully removed. Its found that the whole case cracked in half. The new one fit perfectly in, though it would require re-calibration. The heathkit AM RF generator is used for this task.With that, the last of the components are restored into the unit and brought to Ace hardware to find that last of the missing screws. This allowed for the final tasks to be completed, finishing this restoration, boxing up the unit, and shipping it out to mom.

author: cryptoguru
author_rank: Newbie
timestamp: November 07, 2020, 01:58:14 pm
content: My parent also likes old ancient things that they bought in their youth. We had a radio for 60 years that is really very big and massive. More than that, its design it scares me a lot of my childhood. Frankly speaking, I proposed them to turn it over and sell it for a symbolic price. But they love it and don't let me throw it in a landfill, they say it's a rarity. So in general, I left this idea alone. But when I was searching for the information about old radios I foundPalmgear reviewabout different handheld-cb radios and I offered them to take a seat. It could help them a lot while mom is in the garden or dad is in the garage. Really useful thing.
[VID]: Julius Sumner Miller at the Air Force Academy in 1973 - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: November 04, 2020, 08:35:33 pm
content: Ever so enchanting, spectacularly amusing, endlessly entertaining!

author: edy
author_rank: Super Contributor
timestamp: November 05, 2020, 05:30:05 pm
content: Thanks for sharing. I always enjoyed his lectures... First learned about him watching "The Hilarious House of Frightenstein" a show on Canadian TV back in the late 70's, early 80's. I grew up on this and probably was influenced somewhat as a kid by it.https://www.frightenstein.com/characters/professor.html

author: Brumby
author_rank: Unknown
timestamp: November 06, 2020, 12:03:17 am
content: Around 1963, Miller was also one of the team of celebrity lecturers in the University of Sydney's pioneering "Summer School of Science", broadcast early in the morning during Australia's long summer holidays in January. Fellow presenters included Harry Messel and the astrophysicist James Watson.....WikiI remember sitting in front of the TV watching these with great interest. One of the interesting bits was at the end of the presentation, the floor would be opened to questions from the students present. Some of these were pedestrian, but occasionally one of the questions appeared to stump the presenter - as the response they gave was "That's a good question." and the next question was taken.I also remember my parents were concerned that I wasn't putting in a full effort at school and they wrote to the Professor - and he sent back a response written in texta on the back of a flyer for one of his events. I'm not sure it inspired me to redouble my efforts - but it was cool.It has to be somewhere - but I haven't seen it in decades.
Strange problem with Sony TV - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: November 06, 2020, 05:07:48 pm
content: I have just got a new Sony Bravia TV which due to not being able to get terrestrial TV I use with a Humax sat box. Trouble is that some channels the volume control only works with the sat box and others only with the TV,even with a one for all remote it is a nuisance especial for my wife who has mobility problems. The box and TV are connected via HDMI. I posted this on Sonys forum only to get the answer turn the TV volume right up and use the volume control on the sat box, this is no good as some channels the volume will only be controlled by the TV irrespective of the sat box settings and vice versa.Any one have ideas on this, it has to be something to with HDMI and how that works but what.

author: tom66
author_rank: Super Contributor
timestamp: November 06, 2020, 05:10:06 pm
content: Could be that the TV is controlling the set top box via CEC. Look for a feature like "CEC" or "Bravia Link" and try turning it off.

author: G7PSK
author_rank: Super Contributor
timestamp: November 07, 2020, 04:52:46 pm
content: Quote from: tom66 on November 06, 2020, 05:10:06 pmCannot find any feature such as Bravia link or CEC there is a feature labeled bravia sync but when I click on it the message " no devices found" comes up.

author: Bud
author_rank: Super Contributor
timestamp: November 07, 2020, 08:14:05 pm
content: You may need to connect the devices with a separate audio cable, if both have that option.
Crashed train saved by whale sculpture! - Page 1
Forum section: electronics / general

author: Gyro
author_rank: Super Contributor
timestamp: November 02, 2020, 05:53:35 pm
content: Yes, I know this isn't strictly electronics related, apart from maybe what went wrong with the control / safety systems or whatever, but I just felt the need to share this news story!Quotehttps://www.bbc.co.uk/news/world-europe-54780430I couldn't find any existing threads that could be massaged to fit - maybe we need a general purpose 'Sheer blind luck of the day' sticky thread.Dave, feel free to delete.

author: Gyro
author_rank: Super Contributor
timestamp: November 07, 2020, 01:09:32 pm
content: Another photo (copyright)...https://www.bbc.co.uk/news/in-pictures-54840566

author: nctnico
author_rank: Super Contributor
timestamp: November 07, 2020, 03:43:52 pm
content: Yeah. That is something you don't see everyday. Needless to say the train driver has been extremely lucky.

author: Neilm
author_rank: Super Contributor
timestamp: November 07, 2020, 05:45:35 pm
content: First time I saw this article, I thought "Wow - that train driver was saved by a fluke"

author: TerraHertz
author_rank: Super Contributor
timestamp: November 08, 2020, 01:55:05 am
content: Whale oil beef hooked!

author: Gyro
author_rank: Super Contributor
timestamp: November 08, 2020, 12:51:24 pm
content: They're getting worse!That must be one hell of a sculpture though - the train didn't even hit dead centre, it's right off to one side of the fluke. Ok, the first carriage was lacking the weight it's front bogey by the time it hit and was still attached to the second carriage, but the weight and impact must still have been considerable, it looks completely unreasonable that it held.The driver was incredibly lucky to walk away from certain death, I bet he needed a bit of a sit down when he saw it afterwards.

author: Tadas
author_rank: Contributor
timestamp: November 08, 2020, 01:20:19 pm
content: Knowing Dutch they will update the sculpture and put a (possibly smaller) train wagon on top of it.

author: The Soulman
author_rank: Super Contributor
timestamp: November 08, 2020, 03:31:12 pm
content: Quote from: Tadas on November 08, 2020, 01:20:19 pmNot if it would cost any money.

author: LaserSteve
author_rank: Super Contributor
timestamp: November 08, 2020, 06:59:36 pm
content: It'll buff out.. I hope they fix any damage to the beautiful tail. If it were NYC they would leave any dings in the tail and charge you admission.Steve

author: Domagoj T
author_rank: Frequent Contributor
timestamp: November 08, 2020, 07:55:18 pm
content: The name of the sculpture is "Saved by the Whale's Tail".
It seems I need a new 121GW... - Page 1
Forum section: electronics / general

author: Heroku.Mail
author_rank: Newbie
timestamp: November 03, 2020, 10:13:31 am
content: My son took my 121GW and said its a crucial piece of equipment for the real YouTube star-https://youtu.be/Uooi29Kw09s?t=231I wish I ordered two during Kickstarter campaign... Where can I buy a new one?

author: Halcyon
author_rank: Unknown
timestamp: November 04, 2020, 03:41:02 am
content: Welcome to the forum. You can buy them directly from Dave:https://www.eevblog.com/product/121gw/

author: Heroku.Mail
author_rank: Newbie
timestamp: November 04, 2020, 09:02:38 am
content: It's great, thanks a lot!
Sean Connery RIP - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 31, 2020, 05:54:15 pm
content: https://www.bbc.com/news/entertainment-arts-54761824When I was a kid seeing the 1960s Bond gadgets was always hilarious to me, but the '70s ones seemed to have actual products which I guess may have had something to do with electronics...https://www.007collector.com/mp/

author: coppercone2
author_rank: Super Contributor
timestamp: November 01, 2020, 02:56:44 am
content: don't wanna look at website because I plan to rewatch all the movies now that its been a whileat least he managed to die in the bahamas in his homethunderball never ceases to amaze me. he must have lived in a place like his best movies..anyway as far as gadgets go, I think thunderball nailed it in terms of height of the cold war stuff that would actually be used

author: David Hess
author_rank: Super Contributor
timestamp: November 02, 2020, 03:23:51 am
content: Quote from: coppercone2 on November 01, 2020, 02:56:44 amPlus he got to do Thunderball twice.

author: coppercone2
author_rank: Super Contributor
timestamp: November 02, 2020, 05:05:17 am
content: in the third remake q needs to make some vegan shark snacks for felix to keep the sharks busy (it would be fitting of the new Q)or maybe they can include Charlie the catfish lollmfao, imagine the reaction of one of those 1960's goons to one of these

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: November 02, 2020, 08:15:45 am
content: Quote from: coppercone2 on November 02, 2020, 05:05:17 amAnd I thought the fish we catch in Sydney taste a bit metallic.

author: coppercone2
author_rank: Super Contributor
timestamp: November 03, 2020, 05:22:58 pm
content: tear down?actually fitting dave jones skill set to go into a river and catch a robot fish

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: November 03, 2020, 11:15:05 pm
content: One of the greats in cinema. He will be missed.
Datasheet Collections For Crisis or Communication Outages - Page 1
Forum section: electronics / general

author: russtanner
author_rank: Newbie
timestamp: November 03, 2020, 10:33:37 pm
content: Having this type of information available would be critical to help local economies in case of communication disruptions, internet issues, zombie apocalypseetc.We started a community to help build large, downloadable collections of datasheets and information for just this purpose:https://www.facebook.com/groups/datasheetarchiveprojectCreating this type of collection alone is a daunting task. Having hundreds of people working together will make it really easy.
Current coming out from the input terminal of an OPAMP? - Page 1
Forum section: electronics / general

author: opa627bm
author_rank: Regular Contributor
timestamp: November 03, 2020, 05:41:40 am
content: Hi all,I am trying to design a high speed load that can do ~50W per cell with 1000A/usthe design is pretty standard using OPA690 from TI (high driving current)however, when I leave the input open (Driver1_IN_ALL), I measured about ~4mV acrosss RFS3. Which gives the load cell ~ 1Ａ idle current at FS_IN.I know there is an input offset current, how come there are current coming out from the + terminal ?also, if there is any suggestion to improve the design, will be much appreciated!Cheers

author: Zero999
author_rank: Super Contributor
timestamp: November 03, 2020, 09:19:47 am
content: The OPA690 can have a 4mV input offset voltage and 10µA of bias current, but that's towards the worst case scenario. Are you sure it isn't oscillating? The OPA690 is a very fast op-amp for use in a constant current load application.

author: opa627bm
author_rank: Regular Contributor
timestamp: November 03, 2020, 07:23:12 pm
content: Hi Sir!It is not oscillating , it will however, when I load too much (beyond 100A peak) or duty cycle is in certain rangeduty : 0 ~ 1% , no oscillation, 1~1.5% oscillation, 1.5%->100% no oscillation

author: Fgrir
author_rank: Regular Contributor
timestamp: November 03, 2020, 07:31:48 pm
content: OPA690 Input bias current is +-3ua(typ), which across your 1.82K input resistance gives +-5.46mV. Since the other input of the opamp has different input resistance you can't rely on the offset current spec.

author: Zero999
author_rank: Super Contributor
timestamp: November 04, 2020, 08:49:45 am
content: Quote from: Fgrir on November 03, 2020, 07:31:48 pmThis!I got the decimal point in the wrong place when I made my previous post (I know I didn't post any numbers, but my comment was based on them).Quote from: opa627bm on November 03, 2020, 05:41:40 amAs mentioned above, the current coming out of the input terminals is known as the bias current. The datasheet lists it as typically ±3 μA, which is being multiplied by the resistors connected to the inputs, causing an offset voltage. The resistance seen at both inputs needs to be equal, to minimise the effect of bias currents. You have 10k7||1k82 connected to the +input and 200||300 connected to the -input. Try connecting 1k43 in series with the -input.

author: David Hess
author_rank: Super Contributor
timestamp: November 04, 2020, 09:31:26 pm
content: I agree with Fgrir; you are seeing the not inconsiderable offset caused by the input bias current through the input resistance.This is off topic but I would really like to know how Texas Instruments managed to produce an operational amplifier which has input bias current cancellation *and* an input offset current which is an order of magnitude lower than the input bias current. Input bias current cancellation should make them approximately equal.Or is their datasheet just wrong where it says the input bias current can be positive or negative? And of course they do not give a simplified schematic which might resolve what is going on.
Digilent wants to get rid of 3,000 PCBs, and quickly - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: November 02, 2020, 04:18:16 pm
content: Not idea if it's still valid, found about it from Hackadayhttps://hackaday.com/2020/11/01/hackaday-links-november-1-2020/and the link is to a Reddit threadhttps://www.reddit.com/r/ECE/comments/jke3g0/so_uhhhh_does_anyone_need_about_3000_purple_pcb/the boards were populated and in Taiwan, so the one who takes them in bulk will probably need to pay import taxes, VAT, etc.

author: thm_w
author_rank: Super Contributor
timestamp: November 02, 2020, 09:46:11 pm
content: Theoretically they could be valued at $5, just that customs will rake you over the coals to prove it. Although they don't want these boards used so, its not useful to anyone here.The interesting part here is they ordered 3,000 units from the start. I'm guessing they made projections based off of the AD/DD products, perhaps they sell several thousand per year.Then maybe there was some calculation based on volume discounts starting at the 1,000 component mark.MCP6H82 $1, mrf24wg0ma $19,PIC32MZ2048$10. So might be in the $30-40 BOM range? Depending on what discounts they get.https://store.digilentinc.com/openscope-mz-open-source-all-in-one-instrumentation/

author: amyk
author_rank: Super Contributor
timestamp: November 03, 2020, 04:48:37 am
content: The first comment in the Reddit is funny: "it must be tough to differentiate yourselves from the cheap knock-offs of products from established brands" --- as if Digilent couldn't look anything like Agilent