hybridfree/eevblog-posts huggingface dataset:
SPS2306 vintage transistor replacement - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: April 19, 2020, 11:02:15 pm
content: I am struggling hard to find a data sheet for a SPS2306 (M176) NPNsignaltransistor.Closest reference cross I found was this one.https://vetco.net/products/2n3904-bc547-pn2222-2n4401-npn-transistor-nte123apIt is for Q11/12 on the schematics bellow.

author: vk6zgo
author_rank: Super Contributor
timestamp: April 20, 2020, 12:11:41 am
content: Quote from: gkmaia on April 19, 2020, 11:02:15 pmI have found equivalents lists of little use, & fall back on other means.An old trick is to check whether the equipment uses the same device elsewhere in a "non critical" role.If so, you can probably steal that one & get a "jelly bean" device for the "donor" spot.Another idea is to have a look around to find out what device other manufacturers use in a similar position.The old "What does Philips/Sony/whoever do?" trick.

author: duak
author_rank: Super Contributor
timestamp: April 20, 2020, 03:25:09 am
content: I see that Q11/Q12 are used as back to back zener diodes to clamp the voltage to +/-7 V or so. I have seen the 2N4401 used for this purpose more than any other device but I can't say why; maybe because it is rated for 600 mA.Here's a link to National Semi's 1971 transistor data book. It's surprising how many devices with different numbers use the same die.

author: Benta
author_rank: Super Contributor
timestamp: April 20, 2020, 10:36:23 am
content: SPS transistor numbers were very often custom stamped Motorola types back then. Could be almost anything, you'll need to find an old Motorola Small Signal databook.

author: gkmaia
author_rank: Frequent Contributor
timestamp: April 20, 2020, 11:10:56 am
content: thanks for the old databook tip. I think I found it.

author: critchy87
author_rank: Newbie
timestamp: December 05, 2024, 07:10:18 pm
content: Hi I’m actually looking to replace same transistor sps2306 on a b&k 467 pcb. Did you ever find an equivalent or something that will work?ThanksWilliam
What do you have on your wish list? - Page 1
Forum section: electronics / general

author: forrestc
author_rank: Unknown
timestamp: December 04, 2024, 07:07:32 am
content: It's that time of year when everyone asks me to update my wish list online. This year, however, my wish list has slowly been whittled down to the point where there isn't much left, and I'm sort of at a loss about what to add. So, I need some ideas.I'm not going to put any conditions other than one: I'm asking on the "General Technical Chat" because I'm looking for suggestions that aren't the type of thing you'd find discussed in the Electronics section of this forum. I'm at the stage in my electronics journey (and job) that I should probably join the "Test Equipment Anonymous" group thread instead of asking for some for Christmas. And yes, that goes for tools and components and everything else.On the other hand, I'm not opposed to something unique and more personal that is electronics-design-related. For example, I've been known to buy and assemble a unique electronic kit now and again. But I am hoping to end up with a broader variety of suggestions.So, what do you have on your wish list? Or what have you gotten as a toy/trinket/useful object that you are surprised that you liked so well?
Server PSU CC/CV control mod...  - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: December 02, 2024, 04:06:15 am
content: Recently on AliExpress, eBay, etc... I've seen server power supplys normally an HP DPS-750/1200 or very similar and they have a module connected on the outside which must be a CC/CV controlling device... (attached images below)They're littered all over AliExpress. I searched all over Google and I can't find anything similar or any information whatsoever. There is a bunch of info on changing the output voltage slightly but that's about it.I've also looked for the module itself for sale everywhere but can't find anything.I was just able to find a picture of the internals and the PCB. It looks fairly simple. 1 IC, and a couple pots....So it's seems that there somehow able to control the cc/cv internally on the power supply itself and not using an external cc/cv buck/boost module.If anyone understands how this thing is working or know where to find any information or where to buy one please leave a comment below.
The  23,473rd  Name That Connector Thread.. - Page 1
Forum section: electronics / general

author: LaserSteve
author_rank: Super Contributor
timestamp: December 05, 2024, 03:11:00 pm
content: Posting these for a friend.,...What Are They?

author: tom66
author_rank: Super Contributor
timestamp: December 05, 2024, 03:17:03 pm
content: They are some form of FPC connector. Measure the pitch of the pins and the thickness of FPC that will be accepted (you can try folding a piece of paper to make a rough estimate).

author: LaserSteve
author_rank: Super Contributor
timestamp: December 05, 2024, 04:50:20 pm
content: The small one with the latch is the one of main interest...Thanks,Steve

author: LaserSteve
author_rank: Super Contributor
timestamp: December 06, 2024, 03:48:29 pm
content: Tom, Thank you for your help.Steve
Powering micro gap plasma zones with power transformers. (powering dead shorts) - Page 1
Forum section: electronics / general

author: Thor
author_rank: Contributor
timestamp: November 30, 2024, 04:33:09 pm
content: This paper explains a perspective that goes against efficiency when designing a transformer but it does it with intent to regulate power for a load that can drop to very low impedances. Below operable range (plasma / arc/ dead short). It seems it could have some advantages in plasma generation for micro gaps and can be tuned to were resistive loss is minimal.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: December 02, 2024, 12:48:41 pm
content: 2:20 Not sure if a graphite pencil is the tool of choice when playing with high voltage stuff

author: Thor
author_rank: Contributor
timestamp: December 02, 2024, 10:11:25 pm
content: This transformer is floating and doesn't have a ref to earth. But Yea not the best tool lol...

author: coppercone2
author_rank: Super Contributor
timestamp: December 03, 2024, 06:07:24 am
content: why is it stainless?
Excelent documentary on how IC are manufactured. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: May 24, 2021, 05:01:22 pm
content: This one is a little aged, but, they go from how the pure silicon ingot is grown, polished and cleaned all the way through all the multiple photo-lithography steps and how each level / layer are combined together to make a working IC.(Less interesting at the end is how ICs are mounted on the PCBs, but, this only the last 5% of the docu...)Enjoy!

author: Robert Smith Eco Warrior
author_rank: Regular Contributor
timestamp: May 24, 2021, 05:53:28 pm
content: Good video. I just watched it..... But it is Solder with an 'L' in it

author: duckduck
author_rank: Frequent Contributor
timestamp: May 25, 2021, 08:05:17 pm
content: It's from 1997. It's part of a series of educational films about chip manufacturing:https://siliconrun.com/our-films/silicon-run-lite/

author: tooki
author_rank: Super Contributor
timestamp: May 25, 2021, 10:03:00 pm
content: Quote from: Robert Smith Eco Warrior on May 24, 2021, 05:53:28 pmExcept when it’s not, because American English stays closer to the original French word, which doesn’t have the L.This example of British arrogance has been discussedto death and then some.It’s correct, deal with it.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 26, 2021, 03:01:22 am
content: Quote from: tooki on May 25, 2021, 10:03:00 pmI was going to cook some samon for dinner.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 26, 2021, 07:14:39 am
content: Quote from: Alex Eisenhut on May 26, 2021, 03:01:22 amAla loom in num.

author: magic
author_rank: Super Contributor
timestamp: May 26, 2021, 07:55:38 am
content: I like their explanation of how MOSFET turns on

author: ucanel
author_rank: Regular Contributor
timestamp: May 26, 2021, 09:16:51 am
content: A few days ago this video dropped into my recomended list at youtube.I watched it, smooth and good video, i liked it.I was so sleepy when i was watching so through the end i fell asleep.

author: BrianHG
author_rank: Super Contributor
timestamp: November 30, 2024, 09:11:32 pm
content: An ASML explanation of their Computational lithography, basically promo video.

author: fzabkar
author_rank: Super Contributor
timestamp: December 02, 2024, 07:29:31 pm
content: Quote from: tooki on May 25, 2021, 10:03:00 pmAh, French, that language where only 60% of the letters are actually pronounced and the rest are unnecessary. If it wasn't for the Normans, the English language would still be relatively phonetic. BTW, do Americans pronounce "soldier" with an "L"? Also, there's an "h" in "herb". How does that saying go, "two countries separated by a common language"? Sorry, I just have to laugh.
Looking for manuals. Megalift FSE - Page 1
Forum section: electronics / general

author: reengr
author_rank: Newbie
timestamp: November 28, 2024, 08:28:33 pm
content: Hello everyone!I am looking for documentation for the Megamat Megalift FSE storage system with the MM 240 operator panel.It has an EPIS MB201 controller. I managed to get a lot of useful information from the firmware (Infineon C167 processor), but there are still some parameters that I could not figure out.Please, look at the photo from the "Parameter" menu. There are about 180 parameters and some of them they don't let me sleep. I understand that this is very specific documentation, but you never know.
Speedy Bend-  Lead Forming Tool - ProbeMaster - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: November 24, 2024, 07:47:44 pm
content: I was searching for a set of these and wanted to share in case anyone else finds it useful.Set of lead forming tools from a company called ProbeMaster. Some other interesting items on their site as well.https://probemaster.com/speedy-bend-resistor-lead-forming-tool/Edit - Adding Sanhayat Lead Bender RB-5.https://shop.sunhayato.co.jp/en/blogs/problem-solving/lead-bender

author: cunningfellow
author_rank: Regular Contributor
timestamp: November 24, 2024, 10:48:54 pm
content: Also many variants on Thingiverse

author: Analog Kid
author_rank: Super Contributor
timestamp: November 24, 2024, 11:11:19 pm
content: That looks like something a DIYer could easily make out of wood with mostly just a saw.Looks useful.

author: edavid
author_rank: Super Contributor
timestamp: November 24, 2024, 11:26:18 pm
content: I have a few of these, but I've always found that they don't work any better than pliers.

author: Zoli
author_rank: Frequent Contributor
timestamp: November 25, 2024, 12:13:15 am
content: Quote from: edavid on November 24, 2024, 11:26:18 pmUnless you have to bend hundreds/day; is a semi-mass(up to 10's of boards/day) production tool.

author: TimFox
author_rank: Super Contributor
timestamp: November 25, 2024, 12:14:29 am
content: These tools work well if you are soldering axial-lead components to breadboard-pattern perfboards that have 0.1 inch hole spacing.

author: MarkF
author_rank: Super Contributor
timestamp: November 25, 2024, 01:03:23 am
content: Quote from: cunningfellow on November 24, 2024, 10:48:54 pmHere are STL files for several resistor lead benders I downloaded from Thingiverse if you don't want to do a bunch of searching. They work well if you have a lot to do.I won't spend $10 for one! But did print a couple for 10 cents.
RIP: Tradie Trev - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: November 25, 2024, 03:24:45 am
content: I just got the sad news that Electrical Youtuber Tradie Trev (Trevor Day) has passed away.He was an active commenter on my videos.He also founded the popular Electricans Q&A forum on facebook.It was not an electrical accident or a medical issue, he took his own life.If you are having issues with life, please get help:https://www.lifeline.org.au/Some discussion on Reddit:https://www.reddit.com/r/AusElectricians/comments/1gx8ec0/rest_in_peace_trev/https://www.youtube.com/@TradieTrev/videos

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 25, 2024, 03:49:05 am
content: That is sad to hear, he was often seen commenting on my videos or joining in on my live streams too.
Good old fashioned Space Technology Marketing PR - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: November 21, 2024, 05:09:25 am
content: Hey:TV Insurance fellow was chit-chatting with an astronaut, on one of those NASA Tv shows, and he actually pitched some State Farm Life Insurance, saying he would:"Sell any (astronaut) a policy for The MOON area, no questions asked, on a Life policy."Now that's a dedicated sales person ! That started me thinking; with more and more 'projects' and people, it would be natural to have private entities (besides NASA) that have all kinds of the usual day to day things, just like on Earth.I bet the good sales people will offer deals, too."I'll go to MARS to sell my SUVs if I have to!"Will, be the kinds of things heard, around the campfire table. All kinds of common non-space consumer products.
Phone or gadget batteries that use i2c? - Page 1
Forum section: electronics / general

author: flipper
author_rank: Regular Contributor
timestamp: November 20, 2024, 10:43:23 am
content: Hiiii.I’m learning all about i2c, and I want to know which phone and/or common gadget batteries use i2c for battery comms with host device etc?Appreciate you. Thank you

author: elektryk
author_rank: Regular Contributor
timestamp: November 20, 2024, 11:53:26 am
content: Most of notebook batteries use I2C (Smbus exactly).

author: flipper
author_rank: Regular Contributor
timestamp: November 20, 2024, 10:33:46 pm
content: Quote from: elektryk on November 20, 2024, 11:53:26 amThank you

author: tom66
author_rank: Super Contributor
timestamp: November 20, 2024, 11:15:57 pm
content: Also common to find various single wire interfaces in play like 1-Wire, Dell for instance uses 1-Wire to talk to their chargers (at least their older non type-C USB laptops did) and I believe the batteries used this too.An easy thing to get started on I2C is interfacing with EEPROMs, the vast majority of EEPROMs operate at one common I2C address (0x50 if I recall correctly) and there are Arduino etc libraries available. 24Cxx series EEPROMs are the most common. If you have access to older electronics many devices do contain an EEPROM for user configuration and the like.

author: flipper
author_rank: Regular Contributor
timestamp: November 21, 2024, 12:13:05 am
content: Quote from: tom66 on November 20, 2024, 11:15:57 pmRegarding your latter paragraph, yes, that’s exactly what I’ve done. I pulled two SOIC EEPROMS from an old cordless phone and also a heart monitor receiver (“Medtronic”), and have been dumping them and exploring them with my Arduino Mega 2560, and the assistance of ChatGPT.Earlier, I YouTube searched “i2c in slow motion”, and BOY did I find a wonderful teaching video:
Xgpro + T56 only obtaining BOOT1 & BOOT2 from eMMC - Page 1
Forum section: electronics / general

author: Robert.Adams
author_rank: Contributor
timestamp: November 20, 2024, 01:37:22 pm
content: I've now run into this two times and am wondering if someone has some additional insights:APP Version : 12.67 Model : T56 MFG:2023-05-17Device : AUTO EMMC_1B_1.8V @BGA153Pins Detected Passed!Init EMMC... OK! ( OCR register: C0FF8080 )Reading ECSD : SucceededAuthentication Key not yet programmed, RPMB not usedC:Calcu.available disk capacity: 1231 GBReading BOOT1 : Succeeded. Time : 0.484 S -- Partition Size :2048 KBReading BOOT2 : Succeeded. Time : 0.484 S -- Partition Size :2048 KBReading User Area ...Failed -- No Data respond Status: 00000900 -- 0.00%I don't understand why I can read two small areas but not the main user area.First one happened with a Samsung memory, second with Toshiba. I assumed with RPMB not used being a comment that there would be no read protections on the IC. Are there any other protections that stop eMMC reads from working with a T56? Is it just more likely that the IC is physically damaged in the larger partition from the rework process?

author: tom66
author_rank: Super Contributor
timestamp: November 20, 2024, 04:24:40 pm
content: If an eMMC device has an unrecoverable sector then a failure can occur when that sector is read.
[SOLVED] Understanding UFH Heating control wiring diagram - Why L1 and L2? - Page 1
Forum section: electronics / general

author: dominicM
author_rank: Regular Contributor
timestamp: September 14, 2024, 10:22:05 am
content: I have a Theben HM 12 T KNX heating controller that I want to wire up before my electrician does the final wiring to the consumer unit but I don't quite understand the diagram.Can someone explain why there is an L1 and an L2 instead of just a single shared Live? Where should L1 and L2 connect to?I'd also like to underrstand the purpose for having 4 groups with 3 outputs each. Why not just have a single shared Live with 12 outputs terminal, one for each valve head?Datasheet:https://www.theben.de/ocsmedia/optimized/full/o12814v78_HM_12_T_KNX_Data_sheet.pdf

author: BrokenYugo
author_rank: Super Contributor
timestamp: September 14, 2024, 05:58:53 pm
content: L1, 2, 3= Phase 1, 2, 3.Being this is just a low power control box IDK why they have it on two phases, maybe just to show you can?

author: dominicM
author_rank: Regular Contributor
timestamp: November 19, 2024, 08:44:31 pm
content: That was exactly correct, the manufacturer confirmed diagram illustates 2 phases.

author: themadhippy
author_rank: Super Contributor
timestamp: November 19, 2024, 09:12:07 pm
content: think of it not as 2 or 3 phase,but 2 lives that could come from different timeclocks, thermostats ect you may want certain areas to be on 24 hours whilst others only between 9-5

author: Whales
author_rank: Super Contributor
timestamp: November 19, 2024, 09:50:22 pm
content: I've seen consumer ovens with separate L1 and L2 screw terminals bridged together by the factory with a jumper. Australians typically only have 1 phase wired to their houses, but perhaps in other locales they prefer big loads like ovens to be split across phases.EDIT: Some locales might meter each of your phases separately and bill you extra if your loads are imbalanced?
Single relay socket that fits two wires per common - Page 1
Forum section: electronics / general

author: Jeroen3
author_rank: Super Contributor
timestamp: November 14, 2024, 12:55:30 pm
content: In a cabinet with a large bipolar multiplexer a large number of dual pole relays (RIF-1-RPT-LDP-24DC/2X21AU) has to be changed to a setup where each contact is induvidually controllable, to two single poles.So positive and negative are selectable separately, instead of together using one relay.So I bough a large number of RIF-0-RPT-24DC/21AU, single relays and thought to replace this.However due to some oversight on my part I missed that the dual pole relay socket fits two wires per terminal, and in order to make a multiplexer all commons of relays are linked... meaning they need two wires. I now can only fit one wire into each relay....I can't seem to find any single pole relay sockets that offer this option for two wires per common. I practically only need single throw, eg the C-NO contacts.Do you know of any?

author: themadhippy
author_rank: Super Contributor
timestamp: November 14, 2024, 01:24:00 pm
content: this style of octal base lets you shove 2 wires inhttps://uk.rs-online.com/web/p/relay-sockets/0402147

author: Jeroen3
author_rank: Super Contributor
timestamp: November 14, 2024, 02:04:14 pm
content: Yeah, except I have to replace 34 dual poles in the same rail space.If the space wasn't a constraint I would have doubled the amount of dual poles and only used one contact.One other option I'm exploring is a custom board.

author: ajb
author_rank: Super Contributor
timestamp: November 15, 2024, 04:27:28 am
content: The new sockets seem to have larger holes, will they fit a dual-wire ferrule for your desired wire gauge?

author: H.O
author_rank: Frequent Contributor
timestamp: November 15, 2024, 06:05:50 am
content: In my experience these types of socketsusuallyhave some sort of provision for a busbar in order to common up for example terminal 11 or A1 etc. See Phoenix Contact 2903370 or 2900306 or FINDER 93.01.7.024 as examples. I don't see one in your image but are you sure there are none?

author: Jeroen3
author_rank: Super Contributor
timestamp: November 19, 2024, 07:21:05 am
content: Quote from: ajb on November 15, 2024, 04:27:28 amThis is what I ended up doing, 2x0.5mm2in an uninsulated ferrule. Took me all day...

author: Poroit
author_rank: Frequent Contributor
timestamp: November 19, 2024, 02:17:11 pm
content: G'day Jeroen3.It looks like you have found a solution already.Bear Wago in mind for the future.https://www.wago.com/au/c/installation-terminal-blocks-and-connectors?f=%3Afacet_product_Produkttyp_7845%3ASplicing%20connectors&sort=relevance&pageSize=20

author: Jeroen3
author_rank: Super Contributor
timestamp: November 19, 2024, 03:36:29 pm
content: Haha yes, that could have worked. Other people would have been so annoyed by me using wago's or splice crimps they would've done the work
IEC C3 power cord - Page 1
Forum section: electronics / general

author: antenna
author_rank: Frequent Contributor
timestamp: November 19, 2024, 07:05:49 am
content: Does anyone know where I can source a IEC C3 type power cord with a pin spacing of 10mm? All I can find are C5's and C7'sThanks!

author: sleemanj
author_rank: Super Contributor
timestamp: November 19, 2024, 07:28:21 am
content: Given that C3/4 were withdrawn from the standard, I expect it would be pretty difficult to find. I assume if you have something with the mating part that they did exist at one time.A search of Taobao and 1688 couldn't find anything.If it is for a 1 off, I would probably get a cloverleaf cord (C5) and use a dremel to try and cut out the middle pin enough to fit. Or if the socket on the device can be replaced, do that with a standard C8 or C6.
Why is this stator having a configuration like this? - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: November 16, 2024, 12:46:31 pm
content: What are those steps for?

author: Andy Watson
author_rank: Super Contributor
timestamp: November 16, 2024, 01:00:53 pm
content: Probably to reduce cogging torque.

author: David Hess
author_rank: Super Contributor
timestamp: November 16, 2024, 11:05:03 pm
content: There are more effective ways, but it should reduce cogging without a major change in design.

author: BrianHG
author_rank: Super Contributor
timestamp: November 16, 2024, 11:25:59 pm
content: Instead of staggered, placing the stator's metal at the correct angle IE: ///// can eliminate cogging. Though, existing automatic motor coil winding machines may have difficulty building the motor.It is also possible to do this with 3phase motors/generators by adding a huge thick dedicated conductor coil going through the stator at an odd angle or it can be done electronically.
Help: What connector ist this? - Page 1
Forum section: electronics / general

author: Bicurico
author_rank: Super Contributor
timestamp: November 23, 2024, 11:41:03 am
content: Hello,Can someone identify the connector shown in the picture, labelled as 5?Thanks,Vitor

author: squadchannel
author_rank: Frequent Contributor
timestamp: November 23, 2024, 11:49:37 am
content: looks like industrial monitor/controller.M12 connector or something like similar onesno real image?add: chinese gx12 connector?

author: tom66
author_rank: Super Contributor
timestamp: November 23, 2024, 12:08:19 pm
content: 6 pin DIN connector perhaps?https://www.switchelectronics.co.uk/products/6-pin-din-plug-connector

author: Bicurico
author_rank: Super Contributor
timestamp: November 23, 2024, 12:55:56 pm
content: No picture, yet.Another question: what is GND for, if connection is made throu Vin and Vout?

author: squadchannel
author_rank: Frequent Contributor
timestamp: November 23, 2024, 01:25:34 pm
content: found picsHoneywell Thor CV31looks like GX12,but i dont think honeywell will use it. amphenol probably

author: Bicurico
author_rank: Super Contributor
timestamp: November 23, 2024, 02:28:38 pm
content: That's it!But what do I need to buy in terms of femal connector?

author: tom66
author_rank: Super Contributor
timestamp: November 23, 2024, 02:51:25 pm
content: GND is shield of cable and chassis. DC- is the ground of the power supply. This is usually not tied to ground at the cable or PSU but bonded to ground inside the device. It will pass through a common mode choke to improve EM compliance.

author: Nominal Animal
author_rank: Super Contributor
timestamp: November 23, 2024, 02:56:00 pm
content: You need a GX12-6P, or 6-pin GX12 connector. The cable end is the female one you need for a cable to plug into the shown connector. They are often named "aviation connectors".(I've bought some metal GX12-4P from AliExperess and Banggood for DIY stepper motor cables. No complaints.)

author: Bicurico
author_rank: Super Contributor
timestamp: November 23, 2024, 06:44:19 pm
content: 👍 thanks!AliExpress has them at good prices.
DEEPRobotics Lynx All-Terrian Robot - Page 1
Forum section: electronics / general

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: November 16, 2024, 06:58:14 pm
content: Immagine this robot running after you :

author: globoy
author_rank: Frequent Contributor
timestamp: November 16, 2024, 08:16:49 pm
content: I hope they don't see "Metalhead" as inspiration...

author: SteveThackery
author_rank: Super Contributor
timestamp: November 16, 2024, 10:38:27 pm
content: I think it's a great idea using wheels for the feet. Lock them and it can walk in the usual way, drive them and the robot can reach speeds completely unattainable by normal running actions. I wonder why Boston Dynamics haven't used that system. Or have they and I missed it?
Cooling of IC's: Paste, pad, pudding or nothing? - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: November 15, 2024, 07:25:11 pm
content: Since i havent found much satisfying information about thermal conductivity expecially between pad and paste, i thought i just try it for my self. The information i found in the webs were even the opposite which made it more confusing...Anyone that has got some good links are welcome to post them here. Some proper terms for further research are also welcome.The resistor is this one (2 Ohm with 2.25A going through):https://www.mouser.de/datasheet/2/414/OBSOLETE-MHP20-1671194.pdfMeasurements are of course not scientific, and should be seen only a rough reference. The only things that were reasonably stable, were the thickness, ambient temperature and the power that the resistor dissipated. The temperature was measured with a GUID PC210 IR-Cam. The pads are from an ebike motor, and the paste is "Silicone cooler paste - Heatgrease20" from Startech.com.What i find most interesting, is, that olive oil does a equal good job as the paste, but does drop quickly with thickness.

author: Siwastaja
author_rank: Super Contributor
timestamp: November 15, 2024, 07:53:49 pm
content: Quote from: eTobey on November 15, 2024, 07:25:11 pmRemember that the ages old wisdom that paste is only meant to fill microscopic gaps is still true. Pastes have pretty poor thermal conductivity - datasheets of proper products do show it. Not much better than any random skin lotion.This is because paste won't be mechanically strong to offer any kind of reliable electrical insulation even in thicker layer, so there isno pointof making it thick. Therefore, there is no incentive to make it thermally more conductive. In very thin layers, what it is is enough.This is totally different with thermal pads and especially "gap pads". Unlike grease they respond to the market need of providing electrical insulation, and part of that is adding thickness to safeguard against tiny dirt particles etc. puncturing through the pad, compromising the electrical safety. Gap pads specifically are designed to fill in gaps e.g. when heatsinking different height parts to one heatsink.Now with layers that are intentionaly tens if not hundreds of times thicker than any thermal paste layer, it is worth engineering effort to get into thermal conductivity range of 2 - 20 W/mK which still sucks compared to pure aluminum but isn't that bad at all for something which is electrically insulating and soft.Paste can be 0.2-0.5 W/mK and everybody's happy with it. Except those who try to fill gaps with it against the ages old wisdom.

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 15, 2024, 09:51:31 pm
content: Well, oil does transfer heat and will fill up the tiny gaps. Not as effective as water for heat transfer, but using water here wouldn't be very practical, at least not in direct contact.Unfortunately, olive oil will "dry up" rather quickly, especially when heated, and will make a big mess. Also, the device while operating may smell funky.
Tianjin explosion video captures fear of eyewitnesses - BBC News - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: November 13, 2024, 05:56:42 pm
content: Ok, I know this was 9 years ago...But man, to have this caught on video...

author: tooki
author_rank: Super Contributor
timestamp: November 13, 2024, 05:58:11 pm
content: I was gonna say… you do realize this is 9 years old?I’m not surprised that it was caught on camera, since a raging fire is certainly going to induce some people to start filming.

author: coppice
author_rank: Super Contributor
timestamp: November 13, 2024, 06:16:32 pm
content: 9 years ago there must have been someone looking in the right direction to pull out their phone and start recording even earlier in the fire's development than this. I think this phone was just in a nice spot to see the drama unfold.

author: brucehoult
author_rank: Super Contributor
timestamp: November 13, 2024, 09:51:21 pm
content: Fuck that tone is annoying.The bigger explosion was equivalent to 22 tonnes of high explosive. The Beirut one in 2020 was 200-300 tonnes.The recent Toropets ammo dump explosion in Russia is estimated as 1300 to 1800 tonnes of high explosive for the biggest blast, and registered as a 3.4 earthquake as far away as Norway.I hope those are all in the same units, and equally reliable estimates, but I don't know.
Best Way to Clean Car Air Vents Without Damage: Tools and Tips? - Page 1
Forum section: electronics / general

author: YOUSUTO
author_rank: Newbie
timestamp: November 15, 2024, 01:39:26 am
content: Over time, dust, dirt, and even bacteria can accumulate in your car’s air vents. When you turn on the air conditioning or heating system, these particles are blown into the cabin, affecting the air quality and sometimes causing unpleasant odors. Cleaning your car’s air vents seems like a straightforward task, but it can be tricky because the slats are narrow and hard to reach. Using the wrong tools or being too aggressive could end up damaging the delicate vents or pushing the dirt deeper inside.I’ve tried using a standard cleaning brush, but it doesn’t seem to get into all the tiny crevices, and I’m concerned about leaving lint or fibers behind, especially if I use a regular cotton swab. I’m looking for advice on the best, safest, and most effective way to clean car air vents without causing any harm to the system.What cleaning tools or products have worked for you? Are there any lint-free or specialized cotton swabs or cleaning solutions that you would recommend? How do you manage to clean those tricky spots without making a mess?

author: coppercone2
author_rank: Super Contributor
timestamp: November 15, 2024, 01:58:02 am
content: hitting it with a bottle brush while vacuuming is an optioni have seen cleaning putties, they work well, at least in the lab, for getting rid of dirt in crevaces, even for exotic problems like magnetic dust. I use them for cleaning magnetic contacts

author: xrunner
author_rank: Super Contributor
timestamp: November 15, 2024, 02:01:23 am
content: Quote from: YOUSUTO on November 15, 2024, 01:39:26 amNone worked because I've never cleaned any vents in any vehicle I've owned, other than dusting over them while dusting the interior of the car in a general fashion.

author: Halcyon
author_rank: Unknown
timestamp: November 15, 2024, 09:09:01 am
content: Good try at spamming. You don't need to purchase anything, especially not some bullshit swabs. A simple bristle attachment for a vacuum cleaner or a damp cloth will do the job just fine. Also modern cars (like the one you pictured) have cabin filters to reduce particulate matter in the air.If you think they are "messy" and "tricky to clean", then you're doing it wrong.Your crappy marketing techniques are about 50 years behind.
Does anybody know if CharmHigh is still in business? - Page 1
Forum section: electronics / general

author: midnightvisions
author_rank: Contributor
timestamp: November 13, 2024, 05:55:54 pm
content: Charmhigh-tech.comI tried sending a couple of emails about their pick and place machines and nothing has come back.Does anybody know if Charmhigh is still in business, or have they gone?
B777 Main Equipment Center Walkthrough - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: November 12, 2024, 06:16:14 pm
content: Random find. Video tour of equipment bay on Boeing 777.

author: tom66
author_rank: Super Contributor
timestamp: November 12, 2024, 06:40:07 pm
content: There are lots of really cool videos on aviation on YouTube.I found this video really helpful recently when I had to change the fuel filter on my A320:
[SOLVED (diagrams attached) VGA female to 12 pin IDC pinout needed  - Page 1
Forum section: electronics / general

author: flipper
author_rank: Regular Contributor
timestamp: November 12, 2024, 07:09:56 am
content: : Solved - see my next post in this thread:https://www.eevblog.com/forum/chat/vga-female-to-12-pin-idc-pinout-needed/msg5710771/#msg5710771You’d think the internet (and ChatGPT) would know what this was, and have a pinout… nope.It’s the female VGA socket from an old graphics card, and it runs to the VGA header on the graphics card via 12 pin ribbon cable, and is terminated by an IDC female plug (12 pin) the other end, which mates to said header; the VGA female is mounted in the graphics card bracket with two hex standoffs.Anyway, does anyone have the pinout for the 12 pin IDC female plug end, and a name for this cable/adaptor? Thank you.So much for Google!

author: Nominal Animal
author_rank: Super Contributor
timestamp: November 12, 2024, 09:10:22 am
content: I'm afraid they vary from manufacturer to manufacturer. I have one in storage from a low profile Matrox G200/G400 AGP card, I think.You can find the VGA connector pinout athttps://pinoutguide.com/Video/VGA15_pinout.shtml, and use a multimeter in continuity mode to determine the pins and order on the 12-pin IDC connector.If you need a new one, you can make it yourself, of course. The connectors are ubiquitous. The signal order in the ribbon cable is kinda important, because signals next to each other can capacitively couple to each other; adding a ground in between almost eliminates that.If the problem is that you only have the image and not the actual part, then knowing the exact make and model of the video card would be needed to have even a hope of discovering the pinout.

author: flipper
author_rank: Regular Contributor
timestamp: November 12, 2024, 09:30:47 am
content: Quote from: Nominal Animal on November 12, 2024, 09:10:22 amI can't imagine they'd vary, that seems insane. I metered mine out, here's the pinouts for R, G, B, H-Sync, V-Sync and Ground:

author: amyk
author_rank: Super Contributor
timestamp: November 13, 2024, 12:37:18 am
content: I don't think this was ever standardised but the documentation for the GPU may provide the pinout.

author: flipper
author_rank: Regular Contributor
timestamp: November 13, 2024, 03:32:36 am
content: I appreciate all your help. I now have “bitluni” ‘ s code:https://github.com/bitluni/ESP32Lib…running on my ESP32, sending VGA out (3 bit mode). I shall likely build the R2R ladder “DAC”, soon, for a higher bit depth.ESP32 truly is an interesting board.
YouTube URL formatter code  - Page 1
Forum section: electronics / general

author: flipper
author_rank: Regular Contributor
timestamp: November 10, 2024, 12:26:43 am
content: Since this forum is exceptionally pedantic as to which YouTube URLs it will accept to make the video embed properly, I asked ChatGPT to make a simple YouTube URL formatter.You paste in any old YouTube URL (m.youtube.com/BLAHBLAH or youtu.be/BLAHBLAH) and it spits out a properly formatted URL in the format this forum likes, which you can then just paste into your posts.FYI: The forum only appears to like “https://www.youtube.com/watch?v=<VIDEO_ID>” formatted types.If there’s any errors, please take it up with the ChatGPT bots 🤖 🤣# Edit: the “Copy” button doesn’t seem to work, so please select and copy the formatted URL text. I am not an HTML expert, but please do fix the code if you’d like.Here’s the static HTML, I shoved it on my Pi and serve it with Apache2 web server:Code:<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>YouTube URL Formatter</title></head><body><h2>YouTube URL Formatter</h2><input type="text" id="youtubeUrl" placeholder="Paste YouTube URL here" style="width: 400px;"><button onclick="formatUrl()">Format</button><p>Formatted URL:</p><pre><code id="formattedUrl"></code></pre><button onclick="copyToClipboard()">Copy</button><script>function formatUrl() {const urlInput = document.getElementById("youtubeUrl").value;const formattedUrlOutput = document.getElementById("formattedUrl");try {const url = new URL(urlInput);let videoId = '';if (url.hostname === 'youtu.be') {videoId = url.pathname.slice(1);} else if (url.hostname.includes('youtube.com')) {videoId = url.searchParams.get('v');}if (videoId) {formattedUrlOutput.textContent = `https://www.youtube.com/watch?v=${videoId}`;} else {formattedUrlOutput.textContent = 'Invalid YouTube URL';}} catch (error) {formattedUrlOutput.textContent = 'Invalid URL format';}}function copyToClipboard() {const formattedUrl = document.getElementById("formattedUrl").textContent;navigator.clipboard.writeText(formattedUrl).then(() => {alert("URL copied to clipboard!");}).catch((error) => {alert("Failed to copy: " error);});}</script></body></html>
PBS “Silicon Valley” (“The American Experience”) - Page 1
Forum section: electronics / general

author: flipper
author_rank: Regular Contributor
timestamp: November 09, 2024, 12:46:18 am
content: If you’ve not watched this, I highly recommend it as thoroughly enjoyable and exceptionally well produced.I found “another way” to watch it online, not being from America, but I can’t remember how..https://www.pbs.org/wgbh/americanexperience/films/silicon/

author: schmitt trigger
author_rank: Super Contributor
timestamp: November 09, 2024, 01:20:02 am
content: Back when America didn’t require to be told to be great.She simply was.

author: flipper
author_rank: Regular Contributor
timestamp: November 09, 2024, 03:09:36 am
content: Quote from: Simmed on November 09, 2024, 12:52:20 amThis seems to be an entirely different video.

author: Brumby
author_rank: Unknown
timestamp: November 09, 2024, 04:56:20 am
content: Quote from: flipper on November 09, 2024, 03:09:36 amIt is.I started watching both - and I prefer the one the OP cited.

author: ebastler
author_rank: Super Contributor
timestamp: November 09, 2024, 09:01:41 am
content: Quote from: flipper on November 09, 2024, 12:46:18 amI can watch "chapter 1" on that website, but could not find the remaining chapters. Am I supposed to pay for those via iTunes or Amazon prime, or are they available via the PBS site too?
Let's Connect at Electronica 2024 in Munich! - Page 1
Forum section: electronics / general

author: Brian Chen
author_rank: Newbie
timestamp: November 08, 2024, 01:49:14 pm
content: Hi, Everyone,I will be arriving in Germany on November 10th to attend the Electronica 2024 in Munich from November 12th to 14th. With 20 years of experience in the electronic components industry, I'm excited about the opportunity to meet and connect with international companies and professionals.With my expertise and resources in China, I hope to assist and collaborate with others. I believe that through friendly and in-depth exchanges, we can explore more unknowns and make new friends.If you'll be attending the event or are in Munich during that time, I'd love to meet up! Please feel free to reach out so we can arrange a time to chat.Looking forward to connecting with you!
The Bic Biro: beautiful and fascinating - Page 1
Forum section: electronics / general

author: flipper
author_rank: Regular Contributor
timestamp: November 10, 2024, 12:30:06 am
content: I’ve always loved the form and function of the Bic Biro (and they are also excellent for manually rewinding audio cassettes). Enjoy these marvellous videos:

author: Analog Kid
author_rank: Super Contributor
timestamp: November 10, 2024, 12:46:04 am
content: 1. It's always very kewl to see how things like this are made.2. I don't like Bics, never have. For some reason, they're just esthetically displeasing to me. I really don't like the shape of the cap. Plus they're so ubiquitous; go into any office and they're everywhere. Too many of them!3. That said, they're very well made, and I don't think I've ever seen a sample of one that didn't work.4. At 1:25 in the video there are some things underneath the machines that are blurred out: why?

author: Gyro
author_rank: Super Contributor
timestamp: November 10, 2024, 01:26:05 pm
content: Fun fact. The original Biros were manufactured by Miles Aircraft Limited, for use by the RAF, during WWII. They then started selling them to the general public after the war. Miles eventually became became part of Hunting Hivolt.https://en.wikipedia.org/wiki/Frederick_George_Miles
KIKUSUI  test and measuring instruments Japan / public opinions ?   - Page 1
Forum section: electronics / general

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: November 06, 2011, 09:44:44 pm
content: Currently on my scope of interest are the KIKUSUI electronics corporation, that looks to have interesting high precision multimeters and signal generators.If there is any opinions of how those products compares in a world wide level, just share them freely, rants are also welcome.Subject: Quality / Pricing / support etc.http://www.kikusui-europe.com/product/selection.php?Category=Test%20and%20Measurement

author: Unknown
author_rank: Unknown
timestamp: November 07, 2011, 12:36:51 am
content: Appear to be rebrandedArrayinstruments. TheKeithley versionof that 6.5 digit bench meter was notreceived so well.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: November 07, 2011, 01:02:07 am
content: Thanks Alm , about those subjects I trust your opinion totally.Even so, the unit on the link that I had pointed out indicates a new version - model.From my recent research about Kikusui, they do have Japanese / Chinese / and American division.Thanks for the links.I will download their Users manual so to find out more.Edit: Yes this product is made Mar.2011

author: coromonadalix
author_rank: Super Contributor
timestamp: November 01, 2024, 01:26:30 pm
content: exist underTexio DL2060 ?Kukusui DME1600 and this one has an scanner card option and gpib option cards vs the K2100Chroma 12061 ?getting that gpib card must be hard or impossible ?
~1958 Kuba Komet Television - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: October 31, 2024, 12:32:19 pm
content: If you are interested in vintage / retro televisions you might like this one.A TV I did not know existed. pretty cool design for around 1958.

author: ebastler
author_rank: Super Contributor
timestamp: October 31, 2024, 01:23:14 pm
content: I guess these came complete with bragging rights even back in the day.The manufacturer, "Kuba" is not named after the country by the way, but after its founder Gerhard Kubetschek. They started out making furniture with integrated 3rd party audio and TV chassis, but by the time the "Komet" was launched they also had developed their own electronics chassis.Kuba changed hands a couple of times in later years, first to General Electric, then AEG-Telefunken, and was eventually shut down in 1972.

author: lokin4areason
author_rank: Contributor
timestamp: October 31, 2024, 02:20:03 pm
content: thats an amazing center piece to any living roomlove seeing all the detail work on ityou wont see that any time soon again in person , imo

author: Kleinstein
author_rank: Super Contributor
timestamp: October 31, 2024, 02:45:18 pm
content: For the B&W standard there is not that much difference in the TV signals in Europe and the US. The main difference is the 50/60 Hz vertical frequency. In the old days they did not really cared about the number of lines with a counter.The TV part could still be replaced as a complete set with picture tube and chassis just because it was broken and spare parts from Europe could be hard to get.

author: rf-messkopf
author_rank: Regular Contributor
timestamp: October 31, 2024, 06:41:11 pm
content: The Kuba factory was in Wolfenbüttel, just a few km from here. There was a small museum in the former factory building which had one of these on display, but the museum is currently closed, as far as I know.Another one of these is in the Museum für Kommunikation in Frankfurt:https://de.wikipedia.org/wiki/Kuba-Imperial#/media/Datei:Kombinationstruhe_Kuba_%E2%80%9EKomet%E2%80%9C.jpg.

author: coppercone2
author_rank: Super Contributor
timestamp: November 01, 2024, 06:06:19 am
content: early goauld technology

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 01, 2024, 11:42:09 am
content: Is that Gumby's TV?
David Watts is back - Page 1
Forum section: electronics / general

author: Peabody
author_rank: Super Contributor
timestamp: October 28, 2024, 05:45:58 pm
content: David Watts has posted a new electronics video, the first in what must be a couple years now, maybe three.Now if we can get Ralph Bacon back, it will be just like old times. But I fear something has happened to Ralph. Anybody know?

author: Bud
author_rank: Super Contributor
timestamp: October 28, 2024, 11:27:08 pm
content: Who the fuck is David Watts? It would help if you also wrote why his return was such a big deal.

author: newbrain
author_rank: Super Contributor
timestamp: October 31, 2024, 11:45:32 am
content: Quote from: Bud on October 28, 2024, 11:27:08 pmWish I could be like David Watts!Pa pa papapa papa paaa...(cit.)

author: Xena E
author_rank: Frequent Contributor
timestamp: October 31, 2024, 05:48:59 pm
content: Quote from: newbrain on October 31, 2024, 11:45:32 amHe is the head boy at our school🎶