hybridfree/eevblog-posts huggingface dataset:
Can you destroy your monitor with a scope probe ? - Page 1
Forum section: electronics / general

author: Jan Audio
author_rank: Frequent Contributor
timestamp: April 08, 2021, 01:58:06 pm
content: Hi, can you break computer equipment with probing your scope wrong.My setup :PicKit 3 --> breadboardOld CRT scope.I accidently placed the scope ground on the 5 volt.Then my computerscreen go mad flickering.Have you ever broken your computer with a PicKit/scope ?

author: MK14
author_rank: Super Contributor
timestamp: April 08, 2021, 03:07:27 pm
content: Quote from: Jan Audio on April 08, 2021, 01:58:06 pmYes.

author: PwrElectronics
author_rank: Regular Contributor
timestamp: April 08, 2021, 04:14:24 pm
content: When I read the title...Reminded me of being at a customer site once, mid 00's. They had a fancy newish Lecroy with a touch screen. There was a nasty gouge/dent on the touch screen plastic overlay. Those scopes came with a plastic stylus (aka stick) to use so as not to get fingerprints on the touch screen. So, it was admitted when I asked that someone lost their footing/balance leaning over some gear under test to access the scope and said stylus got jabbed into the screen.We've since had some Lecroy scopes at work that also come with this stylus that conveniently slides into a slot in the faceplate for storage and you'd not know it was there unless someone mentioned it. I don't mention it....I could see this happening with a probe too if one was using it that way for some reason.Fortunately, I've never damaged my laptop in the lab except for that time I was removing a 0805 resistor from a board and it got "flicked" off the PCB and landed on the laptop nearby that had the layout file open on the screen and melted itself into the plastic near the touch pad.

author: m98
author_rank: Frequent Contributor
timestamp: April 08, 2021, 11:11:04 pm
content: Quote from: PwrElectronics on April 08, 2021, 04:14:24 pmWe have a touchscreen Lecroy of that age with such damage in the lab. So that might be the way that happened...

author: Fred27
author_rank: Unknown
timestamp: April 09, 2021, 07:32:45 am
content: Yes. I once destroyed my BBC model B computer by not knowing the scope probe was grounded. (That must have been the 80s when I was about 15. I was really pleased I hadn't destroyed the scope that I'd borrowed from school.)
Help me identify this tactile switch, please - Page 1
Forum section: electronics / general

author: alpher
author_rank: Frequent Contributor
timestamp: April 08, 2021, 06:32:57 pm
content: Here are some pics, bottom line the height of the button is ~25mm or 1", switch is 12x12mm square.Checked the usual places an all I could find were 12mm max height.

author: Twoflower
author_rank: Frequent Contributor
timestamp: April 08, 2021, 06:48:57 pm
content: To me it looks like a switch with no more than 2mm button with a custom made extension attached to the switch.Edit: It seems I was wrong. The extension caps are usually bigger in diameter. And the friendly Chinese has such long tactile switches.

author: alpher
author_rank: Frequent Contributor
timestamp: April 08, 2021, 08:45:44 pm
content: You were right actually.The switch is just plain unremarkable one with square 3mm button:Then there is an extension 8x21mm :I don't really care if it's the same switch all I care are dimmensions 12x12x25mm (the height is crucial ).

author: tooki
author_rank: Super Contributor
timestamp: April 09, 2021, 05:32:32 am
content: The “extension” is a keycap. You might have better luck searching for that term.If it’s just a one-off replacement, just keep the keycap and replace the switch. Check drawings carefully as the square shaft dimensions can vary.

author: kripton2035
author_rank: Super Contributor
timestamp: April 09, 2021, 06:23:11 am
content: one of the many use of a 3d printer !
US navy sonarmen looks at implosion with spectrograpth - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: April 02, 2021, 03:39:20 am
content: https://youtu.be/IBxaxWQ8wdcIncredibly interesting analysis of the sonar of a sinking tug boat.

author: Beamin
author_rank: Super Contributor
timestamp: April 03, 2021, 12:48:56 am
content: here is a play list of sinking boats torpedos and ice shelves
STMPE811 Part Search - Page 1
Forum section: electronics / general

author: Matt95
author_rank: Newbie
timestamp: March 31, 2021, 12:45:51 pm
content: Need support on the availability of a particular component; is it possible to have some more info on the possible availability STMPE811 component? Unfortunately, they are currently not available in any distributor. But it could be that some customers have them in stock to lend us, 1000 pcs would be enough.
Looking for info on the 'And1' Solar Charged Watch - Page 1
Forum section: electronics / general

author: Deodand2014
author_rank: Regular Contributor
timestamp: March 29, 2021, 09:16:36 am
content: I recently stumbled across a solar charged watch that someone was throwing away. The brand name is 'And1' and the model number is '50001'. The only other markings on the back are 'Japanese Movement' and a sticker that says 'Made in China'. From the behaviour I've observed (The watch functions normally in full sunlight, fails when the sunlight is removed.) I'm guessing that the rechargeable battery is no longer working.The backplate is attached by four screws suggesting that the battery may be replaceable, what I'd like to find is information such as a manual. Google searching confirms the watches are for sale via Amazon, but there does not appear to be a company specific website.

author: Deodand2014
author_rank: Regular Contributor
timestamp: March 30, 2021, 12:54:37 am
content: I've added a picture of the front of the watch, just in case it proves useful. Due to image size issues I'm attaching the picture of the writing on the back to this new posting.
Identify Fan connector - Page 1
Forum section: electronics / general

author: veedub565
author_rank: Frequent Contributor
timestamp: March 25, 2021, 11:06:58 am
content: Hi, looking for some help identifying a connectorI'm replacing the fan in a HP 6655A PSU, the OEM part came with the connector already attached. The OEM part is no longer orderable and I've chosen a suitable replacement. The replacement of course just comes with plain wires, no connector. I'm trying to work out what the connector is so I can buy one to fit it to the new fan.If it helps I found a part number for the PCB headerHP 1251-4245 (NSN:5935010494128)It looks like a Molex one, but trying to work out which type

author: GlennSprigg
author_rank: Super Contributor
timestamp: March 25, 2021, 11:34:50 am
content: Can't you cut the connector off the old fan, and join the wires??

author: veedub565
author_rank: Frequent Contributor
timestamp: March 25, 2021, 12:22:45 pm
content: Yeah could do, it would be a neater job with a new connector though. The wires are quite different thicknesses too.

author: amyk
author_rank: Super Contributor
timestamp: March 25, 2021, 01:27:17 pm
content: What's the pin spacing? That should narrow down the possibilities greatly.

author: veedub565
author_rank: Frequent Contributor
timestamp: March 25, 2021, 01:31:08 pm
content: **EDIT**it's 3.96mm according to the info I found for the PCB header (HP 1251-4245)600V 7A

author: veedub565
author_rank: Frequent Contributor
timestamp: March 25, 2021, 01:44:47 pm
content: I might have found a suitable parthttps://uk.farnell.com/amp-te-connectivity/640250-2/housing-0-156-2way/dp/1580074?MER=sy-me-pd-mi-alteorhttps://uk.farnell.com/molex/26-03-4020/connector-rcpt-2pos-1row-3-96mm/dp/1756831The TE Connectivity one actually looks a closer match. the housing looks pretty similar, and the pitch is the same at 3.96mm/ The voltage and current rating aren't the same though, I mean i don't need 600V 7A for this application, it's just a question of if it's physically too small, or the pins are too small to fit the existing header on the board.

author: ajb
author_rank: Super Contributor
timestamp: March 25, 2021, 02:34:51 pm
content: Yeah, Molex KK 396 or the SL-156/HSG were going to be my guess. There may be similar/equivalent from other manufacturers as well.

author: veedub565
author_rank: Frequent Contributor
timestamp: March 25, 2021, 08:24:47 pm
content: Only problem now is buying the thing, the part is about £0.11 but the shippingthe £0.11 part ends up costing upwards of £6

author: amyk
author_rank: Super Contributor
timestamp: March 26, 2021, 01:42:24 pm
content: It seems that "CH3.96" is the generic name for these. This style might have been around for longer than 0.1" connectors, I remember seeing them in '70s electronics.

author: veedub565
author_rank: Frequent Contributor
timestamp: March 28, 2021, 06:48:55 pm
content: Quote from: amyk on March 26, 2021, 01:42:24 pmThanks, that gives me something a bit more generic to look for, rather than a specific manufacturer name.
Analog Devices' $21B Maxim buy set for EU approval - Page 1
Forum section: electronics / general

author: floobydust
author_rank: Super Contributor
timestamp: March 26, 2021, 10:21:54 pm
content: If approved, I dislike mega-conglomerates scooping up independents. Afterwards, they struggle with portfolio duplicates, rebranding datasheets, redoing the website into a slow cow, laying off "redundant" staff that was actually useful and essential to the acquired brand, oh yeah and the price hikes to return immediate value to shareholders.I miss National Semiconductor and Linear TechEuropean Commission scheduled to decide on the bid by March 31, 2021.https://www.reuters.com/article/maxim-intg-ma-analog-devices-eu-idUSL8N2LO5F5

author: nctnico
author_rank: Super Contributor
timestamp: March 26, 2021, 10:57:23 pm
content: This acquisition can only be a good thing. Maxim parts can finally be bought

author: tszaboo
author_rank: Super Contributor
timestamp: March 26, 2021, 10:59:30 pm
content: Well, if they fire the management and sales team (effective immediately) than I'm not sure if this is a bad thing.Maybe we can buy more from maxim than MAX232 without excuses on how its obsolete, they never had it, it was never going into production, it was only uploaded to the website to try the waters, and MOQ is a million.
Why scratch this off. - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: January 21, 2013, 05:06:07 pm
content: I got this DC to DC boost module off Ebay to play with and perhaps to use for an HT battery replacement on a vintage radio, for some reason the makers have removed some of the markings on the IC but not all the number 1053E is still there and on the solder mask next to the IC is the legend YH11053B. Googling 1053 E comes up with synchronous DC to DC boost converter but not for the voltage range claimed by the sellers of this board. I cant see what the secret is that they are trying to hide, unless the ic fell of the back of a lorry or out of the reject skip.

author: tsmith35
author_rank: Frequent Contributor
timestamp: April 08, 2021, 12:31:35 pm
content: And only 8 years later...It's anXL6009E1400KHz 60V 4A Switching Current Boost / Buck-Boost / Inverting DC/DC Converter.Seems pointless to remove the PN since these modules are dirt cheap...
Printing on paper cut tape - Page 1
Forum section: electronics / general

author: chbaird
author_rank: Newbie
timestamp: March 24, 2021, 04:12:25 pm
content: Long time reader, first time poster here.Watch your Digi-Key boxes for a new feature. Been working a few years on this (on the side) and it took a bit of time to scale to the volume we produce every day.

author: tooki
author_rank: Super Contributor
timestamp: March 24, 2021, 05:41:52 pm
content: 😍😍😍

author: Brumby
author_rank: Unknown
timestamp: March 24, 2021, 11:57:04 pm
content: Brilliant idea ... but how many devices do you need to get in order to guarantee having the essential details?Is a strip of 100 enough? A strip of 20 looks like poor odds.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: March 25, 2021, 12:08:06 am
content: Neato

author: bw2341
author_rank: Regular Contributor
timestamp: March 25, 2021, 02:11:07 am
content: From last week's "Desk of Ladyada" livestream (aka Adafruit Industries' Limor Fried):https://youtu.be/_Q4SqlQpvOo?t=786About 5m30s segment of the youtube video starting at the linked time.The info page at DigiKey:https://www.digikey.com/en/resources/part-tracing

author: chbaird
author_rank: Newbie
timestamp: March 25, 2021, 01:35:01 pm
content: QuoteThanks! Unfortunately, the short answer is (as usual), "It depends." If you add a PO number or customer reference, those get printed on each strip, if space allows. Certain supplier names are quite long, while others are short. In general, to get everything, you should probably order at least 600mm of tape. 2mm pitch tape means 300 pieces. 4mm pitch tape means 150 pieces. As a good rule of thumb, 0402 and smaller parts are 2mm pitch. 0603 and larger is 4mm pitch.200mm of tape is required for any printing. Every printed strip includes a "Tracing ID" which allows you to look up all the information about the parts, even if there's not room to print it.On longer strips, we print all the information up to ten times, spaced equally along the length of tape.

author: Gyro
author_rank: Super Contributor
timestamp: March 26, 2021, 09:27:36 pm
content: Ticker tape with added ceramic. Great idea.
Channel about electronics on Odysee  - Page 1
Forum section: electronics / general

author: Gregory
author_rank: Regular Contributor
timestamp: March 30, 2021, 10:22:33 am
content: Hello guys!I started a channel about electronics on Odysee.I think Odysee is becoming a great platform, for me it feels like the youtube 15 years ago!Maybe you like the contenthttps://odysee.com/@AllElectronics:d/microwave-frequency-multiplier-project:0?r=4ub2nt43YVQ1dK2GD6FAYpBtX11SzKyvIf you are at Odysee, take a look! If you are not there yet, I think it's worth it to give a chance to this new community, eev is also there.

author: PlainName
author_rank: Super Contributor
timestamp: March 30, 2021, 02:27:35 pm
content: Quoteyep, complete lack of closed captions. Sizeable group that won't be viewing, there.

author: Gregory
author_rank: Regular Contributor
timestamp: March 30, 2021, 08:14:17 pm
content: It is also on youtube

author: PlainName
author_rank: Super Contributor
timestamp: March 30, 2021, 10:59:21 pm
content: Thanks. But that indicates why Youtube is likely to remain more popular...

author: Gregory
author_rank: Regular Contributor
timestamp: March 31, 2021, 02:16:12 am
content: I don't believe in that.Views and subs on odysse are rising. Volume of lbry credits transactions is growing.I have a bigger channel in portuguese, since 2012. It was my income.I really abandoned it because youtube is becoming unrealistic difficult to deal.But at the end we can't predict the market, so, why not the two platforms
How do I delete this account. - Page 1
Forum section: electronics / general

author: BrianHGinc
author_rank: Newbie
timestamp: March 30, 2021, 06:27:26 am
content: This account was only an attempt to change my email address failure in my true BrianHG account, but now that I found the change had an error in the email address and I activated that account there by making a temporary false email address, I can not longer swap email addresses as EEVblog now says that my true email address is already taken.Soooo, I need to delete this account to swap out the original account to my true email address...

author: Zero999
author_rank: Super Contributor
timestamp: March 30, 2021, 08:53:09 am
content: Message Dave. If this thread isn't deleted, then the original post will appear to be from a guest.

author: tautech
author_rank: Super Contributor
timestamp: March 30, 2021, 09:38:32 am
content: Report yourself or one of these posts to a moderator and ask them politely to help you sort this out.You may need to include a working email address.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: March 30, 2021, 09:47:38 am
content: Quote from: tautech on March 30, 2021, 09:38:32 amThe problem with reporting oneself is thatallthe admins and mods get to see that Brian's little goof.

author: tautech
author_rank: Super Contributor
timestamp: March 30, 2021, 09:54:09 am
content: Quote from: Ed.Kloonk on March 30, 2021, 09:47:38 amSo ?When you're right in the poo who cares as long as someone pulls you out.

author: Halcyon
author_rank: Unknown
timestamp: March 30, 2021, 09:31:13 pm
content: PM Sent
Generate calibrated spikes on top of mains - Page 1
Forum section: electronics / general

author: electricspark
author_rank: Contributor
timestamp: March 23, 2021, 04:25:08 pm
content: I recently purchased an old analogue Cole Mains Check Set model T1007 in mint cosmetic condition. It measures mains voltage and frequency plus four transient levels (10V, 50V, 100V and 200V). The V & F were a little out so I calibrated them against my Brymen BM867s. But I’m at a loss as to how I can easily and cheaply generate a 10/50/100/200 volt spike on top of standard 240 volt mains so I can check/calibrate the remaining four functions. I can’t find an info on Google apart from pictures of the T1007. Has anyone got any ideas?Thanks!
[relax topic] LOL, the funniest parcel ever! - Page 1
Forum section: electronics / general

author: DiTBho
author_rank: Super Contributor
timestamp: March 24, 2021, 03:06:14 pm
content: Just arrived, the sender added a very funny mysterious noteit took me a long time to understand, in English, it should sound something like "(remember to bring) the usual wheelbarrow of rubles in the usual place".So he means he wants to be paid in rubles, so he is looking for bank money transfer, since 1 Russian Ruble equals 0.011 Euro, the "wheelbarrow of rubles" is because "553.64 Euro" corresponds to "50000 Rubles".LOL

author: nuclearcat
author_rank: Unknown
timestamp: March 25, 2021, 11:51:54 am
content: I'm russian, and i'm puzzled by this message. Can't understand what it means...

author: DiTBho
author_rank: Super Contributor
timestamp: March 25, 2021, 12:51:46 pm
content: Yesterday I put on my pocket translator each word reported on the label, there are special letters for this and it was not an easy job, but what it shows back makes sense in English: "the usual wheelbarrow of rubles in the usual place".I took the literary liberty to add (remember to bring).The "wheelbarrow" is a small cart with a single wheel at the front and two supporting legs and two handles at the rear, used typically for carrying loads in building-work or gardening.I think it makes sense and it's humor because I haven't yet paid this dude and if he wants to be paid in Russian Ruble rather than in Euro, well, since one ruble coin is equal to ~ one Euro cent, you need a "wheelbarrow" for carrying all the fifty thousand coins.I do find it funnyCould this be the wrong meaning? If so, it's a more mysterious messageA marginal note to be considered: the sender is not Russian, he lives in Estonia.
Fire at Renesas factory in Japan shuts plant for month - Page 1
Forum section: electronics / general

author: calzap
author_rank: Frequent Contributor
timestamp: March 21, 2021, 09:18:16 pm
content: Plant mostly produced chips for the auto industry. Fire started in a clean room last Friday. I wonder if it was cleaning solvent. No injuries mentioned in the reports. Loss of revenue expected to be US$156 million per month.Links (first link has aftermath pic):https://asia.nikkei.com/Business/Tech/Semiconductors/Chip-starved-automakers-shudder-at-Renesas-plant-s-1-month-halthttps://www.businessinsider.com/auto-chip-supplier-renesas-resume-production-month-semiconductor-2021-3Mike in California

author: jmelson
author_rank: Super Contributor
timestamp: March 23, 2021, 01:09:37 am
content: Hmmm, there seems to be something going on, here. First AKM, then Renesas! Given the costs of these sorts of events, it would seem that these companies would work VERY hard to prevent fires and other disasters in these fabs.Jon

author: coppercone2
author_rank: Super Contributor
timestamp: March 23, 2021, 02:17:05 am
content: those guys probobly needed a vacation anyway

author: tooki
author_rank: Super Contributor
timestamp: March 23, 2021, 10:35:25 am
content: Quote from: jmelson on March 23, 2021, 01:09:37 amTwo events don’t prove theydon’tdo that! Without knowing how many fire events have been prevented by existing measures, we know nothing about whether there is any negligence (never mind the nefarious reasons you hint at). Not to mention that random chance does allow for extremely rare events to happen in close proximity.

author: tszaboo
author_rank: Super Contributor
timestamp: March 23, 2021, 11:23:11 am
content: That's all right, it's not like we have a parts shortage. Everything is fine, if your design only uses passives and 7400 series logic chips. I can see that there is also no shortage of fasteners. Maybe car makers just make everything mechanical again.And I see that they bought Dialog semiconductor. Great. I just got info that the support from Dialog for small customers will improve. So much for that now.
I want to replace fireplace millivolt switch with relay  - Page 1
Forum section: electronics / general

author: cseevinck
author_rank: Newbie
timestamp: March 22, 2021, 02:00:18 pm
content: This is my first time posting of this board. I am not sure I have the correct place, please advise if I should repost on a different forum.I have a gas fireplace with a thermocouple that is controlled by a millivolt switch. I have had to replace the wall mounted switch a number of times because the resistance increases over time (contacts getting dirty or whatever). I would like to use a regular switch on the wall that is not as sensitive as a millivolt switch and have the switch throw a solid state relay that will close the circuit for the thermocouple. The regular switch end would be powered by a battery or a transformer. If I get this working I will try to connect a smartswitch to drive the powered end so I can turn the thing on using my phone or a remote control. But my first interest is to get rid of the milllivolt switch.Any pointers will be appreciated.

author: jmelson
author_rank: Super Contributor
timestamp: March 23, 2021, 12:57:32 am
content: A solid state relay will not operate a millivolt system. The thermocouple/thermopile only generates about 600 mV DC, typical SSRs only work on AC and drop more than 1 V. It is remotely possible this could actually be done with a power MOSFET.Jon
My work mate pranked me. - Page 1
Forum section: electronics / general

author: josh132
author_rank: Contributor
timestamp: March 22, 2021, 02:30:48 am
content: you know the trust soldering iron/station. It is a very important thing to electronics. But my work mate pranked me by putting rice in between the heating element and the iron. I got one of the new soldering stations. So when i turned it on at set it to 600 degrees Fahrenheit, the work bench started to smell funny. Smells like burning rice cakes. I didn't think much of it and thought my work mate burned something. But then my iron starts making popping and cracking noises. I immediately turned it off and inspected it for water... that's when my work mate started laughing on the other side. I was furious knowing he did something. I angrily asked him what he did to my expensive iron and simply replied "rice". So that's how he pranked me. Since he is also on the EEVblog a lot. I want to tell him a personal message: F#CK YOU MATE! I HAD TO BUY A NEW $140 HEATING ELEMENT!

author: RayRay
author_rank: Frequent Contributor
timestamp: March 22, 2021, 02:52:09 am
content: Have to admit I've had a good gigle out of it!But the cost of the new heating element makes me wonder if this is for real. $140 for a new element? Is it encrusted in gold & diamonds? That's insanely expensive! As for your friend, if this actually happened, I'd suggest you get a new job and drop him like bad habit! Only an immature asshole would pull something like that!

author: josh132
author_rank: Contributor
timestamp: March 23, 2021, 07:09:45 pm
content: yea i did switch work mates after that. His name is Benjamin. 'Im now happily working at my job with a new work mate, and he is A LOT kinder than Benjamin.
Mars copter vs Mars plane - Page 1
Forum section: electronics / general

author: msuffidy
author_rank: Frequent Contributor
timestamp: March 21, 2021, 12:09:38 am
content: Since helicopters or drone are essentially energy inefficient, perhaps it would have been easier to make a really wide winged RC plane for Mars? It could legitimately fly around for a while.

author: igendel
author_rank: Frequent Contributor
timestamp: March 21, 2021, 12:40:37 am
content: But takeoff and landing on a "runway" of sand and rocks might be harder. Perhaps a mars VTOL

author: cdev
author_rank: Super Contributor
timestamp: March 21, 2021, 12:56:48 am
content: i think that was discussed in the Mars helicopter video from JPL. And indeed, you are right, despite the thinness of the atmosphere it is more efficient that way.

author: MikeK
author_rank: Super Contributor
timestamp: March 21, 2021, 01:10:08 am
content: Energy inefficient, where? On Earth? Maybe not on Mars? I would guess that a helicopter on Mars is much more efficient than a plane given that it's relatively easy to get some small rotors spinning fast but not so easy to get a large plane going fast enough to generate lift. I would even bet that we never get planes on Mars.

author: msuffidy
author_rank: Frequent Contributor
timestamp: March 21, 2021, 03:10:43 am
content: I guess I could have read this first but I just assumed the problem with copters is that they use constant energy to fight gravity and mostly just stay stationary:https://en.wikipedia.org/wiki/Mars_aircraft

author: Brumby
author_rank: Unknown
timestamp: March 21, 2021, 09:39:56 am
content: Forget energy efficiency. You are focusing on the wrong criteria ... completely.

author: Brumby
author_rank: Unknown
timestamp: March 21, 2021, 12:15:50 pm
content: This is a FAR more important factor:Quote from: igendel on March 21, 2021, 12:40:37 am

author: cdev
author_rank: Super Contributor
timestamp: March 21, 2021, 03:47:48 pm
content: Thats really important because if the mars plane gets overturned or somehow in a non-upright state, righting it top side up, might be impossible, being as much as tens of millions of miles away.It seems to me thinking about it that I have not seen a suitable completely flat area in all the Mars pics I have seen, (a lot) There must be some , like sand, but not a real lot, and mapping would have to be done to locate it.Here on Earth, with people to fix things, one way around the dearth of airports wherever you wantthem is a parasail-or paraplane like setup? On Youtube there is video of some guy living in the midst of the US midwest (very flat for hundreds of miles) going to a McDonalds several towns away for a hamburger with his paraplane.Quote from: Brumby on March 21, 2021, 12:15:50 pm
RG6 F-type connector for stranded / thin central conductor? - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: March 05, 2021, 11:14:54 pm
content: Ideally I would replace the coax with one with solid center wire, but wonder if such connectors common and how I find one on ebay / aliexpress.

author: drussell
author_rank: Super Contributor
timestamp: March 20, 2021, 01:49:37 pm
content: You mean something like a Canare FP-C53A?Canare FP-C series:http://www.canare.com/ProductItemDisplay.aspx?productItemID=38Edit:Oh, for RG-6 you probably want something like FP-C7FA, double check your diameters!
Dirac delta function integral - Page 1
Forum section: electronics / general

author: Cujo
author_rank: Regular Contributor
timestamp: March 21, 2021, 04:17:58 am
content: I have no idea how to solve this Dirac delta function integral. So I would like some help please?

author: ataradov
author_rank: Super Contributor
timestamp: March 21, 2021, 04:39:10 am
content: Is delta prime in this notation a standard Dirac function, or does the prime means something here?If it is a plain Dirac function, then it would be exp(5*0). In general an integral from a to b of f(x)*delta(x-c) is f(c) for a < c < b, 1/2*f(c) if c == a or c == b, or 0 otherwise.

author: Cujo
author_rank: Regular Contributor
timestamp: March 21, 2021, 04:44:40 am
content: Quote from: ataradov on March 21, 2021, 04:39:10 amI think its the derivative of the delta function? The question doesn't say. It just says solve the integrals with no context.

author: ataradov
author_rank: Super Contributor
timestamp: March 21, 2021, 04:58:02 am
content: I'm not sure if it apples to the Dirac function (partially because it is not really a function), but there is a thing where int(-inf, +inf) [f(x)*g'(x)dx] = -int(-inf, +inf) [f'(x)*g(x)dx].I'm also not sure how this translates to definite integrals. But that may be at least direction for reseach.

author: ejeffrey
author_rank: Super Contributor
timestamp: March 21, 2021, 04:59:54 am
content: Huh. I always thought the dirac delta function was non-differentiable but according to wikipedia you can define a differential distribution by integrating by parts the definition of the delta function.https://en.wikipedia.org/wiki/Dirac_delta_function#Distributional_derivativesIf you evaluate that formula you get -5 * exp(5*t) | t=0 = -5

author: Cujo
author_rank: Regular Contributor
timestamp: March 21, 2021, 05:05:54 am
content: Quote from: ejeffrey on March 21, 2021, 04:59:54 amThis seems 100% correct, if you write the derivative delta function in Leibniz's notation, the dt cancels with the integral and your left with two "functions" multiplying together, hence use by parts.Thank you

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: March 21, 2021, 07:23:02 am
content: you can try to integrate by parts,https://revisionmaths.com/advanced-level-maths-revision/pure-maths/calculus/integration-parts
Amtech fluxes no longer available on tme site - Page 1
Forum section: electronics / general

author: robgerr
author_rank: Contributor
timestamp: March 20, 2021, 11:45:32 am
content: Good morning friends of the forum. I have always bought the original amtech flux ANC559V2 / 10 on the tme website even if the last one I bought gave me some problems in soldering the new bga lead free (notebook) and I had to reball them with lead balls and re-solder them, then everything ok. I have always had the same profile and have never had any problems, I thought that perhaps the culprit is the amtech flux that I have always bought from tme (to be sure it is original and not fake). Today I go to the tme site and it is known that all amtech fluxes are no longer availableI would like to understand if there is an alternative site where to buy them originals (I live in Italy) or an alternative product with the same characteristics of the amtech ANC559V2. One face I tried the nordson and I remember that I was fine. Thank youP.s. Sorry for my perfect english google translator
Dubox connector crimping tool recommendation - Page 1
Forum section: electronics / general

author: jdrexler
author_rank: Newbie
timestamp: March 16, 2021, 08:55:59 pm
content: Hello,I would like to ask you, if you have some recommendation for alternative crimping tool for FCI Dubox 2.54 pitch connectors. I know best is original tool, but if we don't use it on daily basis, in can be sufficient use some cheaper tool (if exist).Main complication we have with insulating part, where connector isn't symmetric and most crimping tool can't crimp it right way.https://www.amphenol-icc.com/dubox-76347401lf.htmlThank you very much,Jan

author: jpanhalt
author_rank: Super Contributor
timestamp: March 16, 2021, 09:28:18 pm
content: For that large of connecor, I use an unbranded one like this:https://www.amazon.com/Crimping-0-08-1-0-18-28AWG-Ratcheting-Connector/dp/B01N1RFZZ4/ref=asc_df_B01N1RFZZ4/?tag=hyprod-20&linkCode=df0&hvadid=309735728871&hvpos=&hvnetw=g&hvrand=4919047658647684223&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1024046&hvtargid=pla-525894687595&psc=11) It has ratcheting.2) It has adjustments.3) Mine has green handles.Mine was about the same or slightly less price.One thing I do to help is to use a pair of small forceps (like "hemostats") to slightly bend the insulation tangs against the insulation a little. That holds the wire in place before actually doing the crimp.

author: tooki
author_rank: Super Contributor
timestamp: March 17, 2021, 06:33:43 am
content: Quote from: jdrexler on March 16, 2021, 08:55:59 pmLook at my big thread on small contact crimpers:https://www.eevblog.com/forum/reviews/affordable-crimp-tools-for-small-connectors-(dupont-etc-)/It covers a few options that have the proper circular insulation crimp die needed by those staggered insulation wings.

author: jdrexler
author_rank: Newbie
timestamp: March 18, 2021, 11:19:08 pm
content: Quote from: jpanhalt on March 16, 2021, 09:28:18 pmThank you for recommendation. We found it directly on manufacture shop for price about 15$, so we will take it there with some other toolshttps://www.crimpingtools.com/collections/all/products/sn-2549-ratchet-crimping-tools-for-awg-28-18?_pos=1&_sid=d72d77591&_ss=rHave a nice dayJan

author: jdrexler
author_rank: Newbie
timestamp: March 18, 2021, 11:22:45 pm
content: Quote from: tooki on March 17, 2021, 06:33:43 amThank you for great content. It gave me good overview.Jan
Location, Location, Location... - Page 1
Forum section: electronics / general

author: gnuarm
author_rank: Super Contributor
timestamp: March 21, 2021, 04:39:12 pm
content: I'm looking into moving to Florida for tax reasons later this year. I would reincorporate there when this happens. However, I have a potentially large contract coming in and don't want to change locations while in process. So I'm thinking of obtaining a virtual office and incorporating in Florida now.As far as I can tell, there is no reason why this would not be legal. My corporation is an S corp, so the tax advantages would only manifest once I move as well.Has anyone done something like this, relocating your business to a state where you are not a resident? I'm not sure what the pitfalls are. Or I suppose I should ask if there are any specifics about doing business as a Florida company. I was surprised by one state I registered in. States can have funny laws.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 21, 2021, 06:03:33 pm
content: I would find a business consultant/CPA in Florida and ask.

author: gnuarm
author_rank: Super Contributor
timestamp: March 21, 2021, 06:19:40 pm
content: Good idea. A friend lives in FL in the winter. I'll ask who he uses.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 21, 2021, 06:28:53 pm
content: My wife runs a CPA/business management company for musicians - from what I've observed, it can be horribly complicated. Just the thought of the tax complications for the year you make the move gives me the willies.

author: gnuarm
author_rank: Super Contributor
timestamp: March 21, 2021, 06:38:01 pm
content: Yeah, my business has interminable periods of inactivity, then million dollar orders. This time it is exactly the issue of parts being so hard to find that is driving my customer to horde my product at the time it will be the hardest to build them.But you can't get blood from a turnip. I will build as I can get parts and ship when they are ready. I expect this order to not be completed until next year actually. If I don't get the PO soon, I may not be able to start delivery until next year.

author: gnuarm
author_rank: Super Contributor
timestamp: March 21, 2021, 08:23:12 pm
content: Any chance your wife could put me in touch with a business management company in FL? I guess I need to pick a location first...

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 21, 2021, 08:37:39 pm
content: Quote from: gnuarm on March 21, 2021, 08:23:12 pmProbably not because she is in a very niche market with its own quirks and challenges. However, I do consulting work for a lab instrumentation company based in Florida. I can ask them who their accountants are.

author: gnuarm
author_rank: Super Contributor
timestamp: March 21, 2021, 10:17:31 pm
content: Ok, thanks. I've been looking around a bit today and might try to find a location around Orlando. I will only live there part time and might want to rent out the rest of the time.
Typical HF antenna big signal levels? - Page 1
Forum section: electronics / general

author: sv3ora
author_rank: Regular Contributor
timestamp: March 18, 2021, 01:06:34 am
content: What are typically considered big signals on an HF antenna?How about 100mVpp?How about 10mVpp?Are these really big signal levels that would be expected to be received by an antenna from these S9+60dB commercial stations?(I want to design an RF preamplifier and I consider the typical maximum levels that one would encounter, so the amplifier not to distort the signals)

author: wn1fju
author_rank: Frequent Contributor
timestamp: March 18, 2021, 11:39:31 am
content: The accepted convention is that an S9 signal is -73 dBm, or 50 uV (into a 50 ohm system). So an S9+60 dB signal would have a voltage 1000 times that, or 50 mV.
What's going on with Digikey, Mouser and Newark slowing down? - Page 1
Forum section: electronics / general

author: jayk
author_rank: Regular Contributor
timestamp: March 17, 2021, 01:06:57 am
content: I order a decent amount of parts from Digikey, Mouser and Newark (here in the US) - generally 1-2 small orders a week for various R&D stuff. Up until a few weeks ago my orders would generally go out the same day. But lately all three seem to have fallen apart... small orders are now taking 3 or more days just to ship. I'm talking about parts that are in stock and, until recently, would have shipped the same day. Have they really gotten so much busier? Or maybe they've lost a bunch of employees? Anyone else notice this?

author: KE5FX
author_rank: Super Contributor
timestamp: March 17, 2021, 01:31:58 am
content: Mouser was affected by the recent Texas winter storm and its accompanying power-outage crisis, and had to shut down for at least a couple of days due to that. I believe they also experienced a COVID-19 outbreak that took some essential personnel out of action.Not sure what's up with DigiKey. They are very well accustomed to bad weather up there, unlike the Texans.

author: james_s
author_rank: Super Contributor
timestamp: March 17, 2021, 02:22:01 am
content: Could be demand is starting to pick back up as things start to open back up, coupled with the ongoing supply chain and logistics challenges posed by the pandemic.

author: notsob
author_rank: Frequent Contributor
timestamp: March 17, 2021, 02:26:59 am
content: There are worldwide shipping delays due to covid, it has definitely slowed down getting parts from manufacturers, without adding in what happens in delays when an employee tests positive

author: bombledmonk
author_rank: Regular Contributor
timestamp: March 18, 2021, 04:17:59 am
content: The entire distribution industry is seeing up-and-to-the-right record demand for months now. I know at least two distributors are actually pulling large chunks of office staff and director/manager/vp's into picking, packing, and put-away for significant hours. Demand combined with covid precautions are definitely limiting supply chains in general, and the ability to staff up to meet demand is limited. Digi-Key, for example, employs 4000 people in a city of 8800 in a generally rural part of the state. It is looking tohire up to 150 people a monthand that's for jobs with starting total compensation of $69k for people walking in with a high school diploma.
Transparent wood with comparable strength ... and DIY-able - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: February 10, 2021, 12:02:08 pm
content: Looking at the chemicals involved and the processing which are not hard to find and also just UV light or Sun light. :-->Solar-assisted fabrication of large-scale, patternable transparent woodIts also downloadable in PDF.

author: westfw
author_rank: Super Contributor
timestamp: February 18, 2021, 02:17:09 am
content: FWIW, I've been trying this, and have been unable to get a piece of balsa to bleach using the peroxide and sun I have available :-( Maybe I need to wait till summer!

author: BravoV
author_rank: Super Contributor
timestamp: February 18, 2021, 05:54:13 am
content: Quote from: westfw on February 18, 2021, 02:17:09 amPlease, update us on your work, thanks.

author: thm_w
author_rank: Super Contributor
timestamp: February 18, 2021, 09:47:37 pm
content: Quote from: westfw on February 18, 2021, 02:17:09 amYou put sodium hydroxide and hydrogen peroxide yeah?Quote

author: westfw
author_rank: Super Contributor
timestamp: February 19, 2021, 02:24:56 am
content: I didn't see the NaOH the first time.Also, I want to try a range of "consumer" peroxides:3% "medicinal."6-10% "hair bleach."~27% "pool sanitizer"

author: westfw
author_rank: Super Contributor
timestamp: March 17, 2021, 02:15:43 am
content: Someone else (amateur) has published first!https://youtu.be/s9FdbYWK7rcPretty nicely done, if a bit "chatty." (includes lots of failure! Only "marginal" success in the end.)The NaOH did turn out to be significant.
The UniWave - Page 1
Forum section: electronics / general

author: Cyberduke
author_rank: Contributor
timestamp: March 15, 2021, 07:44:25 pm
content: So I randomly ran into this video online(as one does), and obviously I immediately started thinking about the real practicality of such a product(How much power it could theoretically produce etc...). I would definitely be interested in hearing some thoughts of other people regarding this. I do not think at this point I can really provide an educated enough opinion, but I thought it would be interesting to bring up.Some more information is available on their website.https://www.waveswell.com/

author: GlennSprigg
author_rank: Super Contributor
timestamp: March 16, 2021, 01:42:21 pm
content: Hi!!... No-one else has answered, so I'll mention something of a similar engineering, but inREVERSE!! haha...Instead of using thevertical oscillationof water to 'produce' energy, I'm reminded of a 'pump' that works in reverse!!It was called a "Humphrey Pump" from back in the 1950's or something. (Very large). It was 'something' like a 2(4??) stroke engine,where the oscillating 'water' was the actual 'Piston', and the explosion of gasses above, drove the 'water' (piston) down, to cycle thewater flow! In a little remote town inSouth-Australia, called "Cobdogla", there is a working museum with the last known working unitin the Southern Hemisphere!. I've watched it working, many decades ago, and the 'gas' it burnt/exploded was produced by burning coal.Just thought I would mention it... 99.99% of people would never have seen/heard of it!!
RX 6700 XT launch - Page 1
Forum section: electronics / general

author: grumpydoc
author_rank: Super Contributor
timestamp: March 19, 2021, 12:37:48 pm
content: What was the point of this?I probably could have grabbed one, although the only UK vendor that seemed to actually be offering stock was Sc*n but mostly I just watched them sell out.In less than 20 minutesSo we're now back to lack of general availability until, if we're lucky, next year.Sigh
Higher current equivalent of LR8 - Page 1
Forum section: electronics / general

author: cowasaki
author_rank: Frequent Contributor
timestamp: March 15, 2021, 10:34:57 pm
content: Anybody know of a higher current equivalent of the LR8 whilst keeping the high voltage (450v would just about do unless I can get to 600v)? 30mA is dramatically lower than the required current. If possible I would like 200 but any increase would be helpful even with 100 I could use 3, using 10 is a bit silly....... I appreciate I can go down the route of a pass MOSFET such as an IRF840 but I was just hoping to simplify things.Thanks
Keysight University Live is down... - Page 1
Forum section: electronics / general

author: Bicurico
author_rank: Super Contributor
timestamp: March 15, 2021, 04:23:43 pm
content: I think Keysight has exceeded themselves this year!So many prices and actually interesting courses!The result?https://kulive.keysight.com/just shows "502 Bad Gateway"Regards,Vitor

author: Michael YYZ
author_rank: Regular Contributor
timestamp: March 15, 2021, 04:36:03 pm
content: So it’s not just at my end.

author: Fred27
author_rank: Unknown
timestamp: March 15, 2021, 04:37:24 pm
content: You can go direct to YouTube. It eventually started after quite a few different "starting soon" screens.
Bosch new wafer fab in Dresden - Page 1
Forum section: electronics / general

author: Karel
author_rank: Super Contributor
timestamp: March 14, 2021, 04:36:39 pm
content: "Bosch reaches milestone on the way to opening new wafer fab in Dresden"https://www.bosch-press.nl/pressportal/nl/en/press-release-24065.html

author: SilverSolder
author_rank: Super Contributor
timestamp: March 15, 2021, 02:16:46 am
content: This is a capability that makes so much sense...
What happened to the "All" button? - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: March 10, 2021, 10:55:24 pm
content: At the bottom of a forum thread there are buttons to select a particular page, and there was a button to show all in one long page. Now that button has gone. Was handy for donkeys like me that need to check before posting if they have already made the same comment. Is it coming back?

author: Brumby
author_rank: Unknown
timestamp: March 10, 2021, 11:37:44 pm
content: Also at the top, as well as in the thread list view ... It is still there.However, it only appears when there is more than one page of replies and less than (or equal to?) 500 replies.The 500 limit is to make sure the server doesn't get hammered too much.

author: Circlotron
author_rank: Super Contributor
timestamp: March 11, 2021, 12:07:57 am
content: 500 reply limit? Aha. The thread I was looking at is 27 pages long.Thanks.

author: TerraHertz
author_rank: Super Contributor
timestamp: March 12, 2021, 05:20:09 am
content: Dave could make a few extra coins by allowing 'download all' on very long threads (like TEA) - for a small fee. Sometimes people will want local copies.

author: GlennSprigg
author_rank: Super Contributor
timestamp: March 14, 2021, 12:59:45 pm
content: I keep looking for the 'ANY' key!!!
UTSOURCE Bad expirience - Page 1
Forum section: electronics / general

author: GigaJoe
author_rank: Frequent Contributor
timestamp: March 11, 2021, 05:53:56 pm
content: Hello,I like to share by bad experience withhttps://www.utsource.net/(Who really telling about a good one)This store kind popular and recently redesign web interface to be more attractive, like: "used certify parts"I had a few orders , recently i ordered NE5534 , OP27 - both shows a slew rate of 0.5 V/μs , top cleared by acetone. They excused and refunded to my utsource's personal account ...So recently decided to cleared that refund to order something , That was LM3886, an i received an "excellent utsource original used certified" parts,Re-sanded and re-labeledMoral of the story: acetone your best friend to reveal truth , when you buying from UTsource. soo ... Beware and aware when purchasing "used certified" , probably "new certified" as well.UPD: Haven't get any response back for a week about it, hope the will react, will update ...
X-Acto clamp/heatsink - Page 1
Forum section: electronics / general

author: MikeK
author_rank: Super Contributor
timestamp: March 11, 2021, 12:28:06 am
content: I've had these since I was a kid. As an adult I've used them for heatsinking and holding parts while soldering. And gluing labels to female pin header sockets. Too bad they don't make them anymore. Has anyone seen similar? They're about 2" long. I'd love to have many more. Self-closing tweezers just don't do it, being too long and heavy.

author: jbeng
author_rank: Regular Contributor
timestamp: March 11, 2021, 12:38:32 am
content: They call those "Cross Locking Clamps" and here's a link to a company that has them:https://www.micromark.com/Cross-Locking-Clamps-Set-of-6

author: MikeK
author_rank: Super Contributor
timestamp: March 11, 2021, 12:45:20 am
content: Thanks.