hybridfree/eevblog-posts huggingface dataset:
LTspice post-processors to animate .step plots with a slider? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: July 10, 2021, 12:31:50 pm
content: By default the plots displayed after a multiple simulation (with the .step directive) will plot all the simulation on the same chart, with traces of different colors for each step. I know how to select only certain steps, but this is cumbersome and time consuming. What I want is to have a slider, and when dragging the slider to select a different .step simulation from the results. No data interpolation, just to switch the plotted set from the slider.I want something that can change the plots like this, but with a slider to control the steps of the animation:I crave for something like this almost every time I study something using LTspice, so I suspect others wanted a feature like that, too. I could write my own program, but chances are somebody already did a tool to do just that.Any ready made post-processor programs for LTspice simulation results? (google doesn't show any)

author: RoGeorge
author_rank: Super Contributor
timestamp: July 12, 2021, 07:53:53 am
content: Just for the docs, couldn't find a ready made tool to do animations, but there is a Python module called "ltspice", module that can understand the .raw data files produced by LTspice:https://pypi.org/project/ltspice/Gave it a try yesterday. The module doesn't know to work with .step SPICE directives directly, but it can grab a specified .step section from the data file, and from there all the currents and voltages can be extracted by their SPICE names, and can be used as Python arrays.From there it's easy to do the rest in Python with numpy and matplotlib, including sliders or animated plots like the one above.
joke - Page 1
Forum section: electronics / general

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 14, 2021, 03:06:25 am
content: https://www.eevblog.com/forum/chat/mods-are-asleep-post-eevmemes/

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: July 14, 2021, 04:29:18 am
content: Shocking.
??? Can't figure out how GIGATRON produces text, on its VGA output ??? - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: July 11, 2021, 04:15:03 pm
content: How does Gigatron display text, while doing text entry with Tiny BasicThe connected Arduino supplies a PS2 keyboard connection, and puts out ASCII characters, (I suppose).So each byte has an ASCII code, but somewhere there has to be a character generator, producing like a 9 by 7 cell for display (VGA), on the GIGATRONIC PC board, right ?

author: RJSV
author_rank: Super Contributor
timestamp: July 11, 2021, 04:20:53 pm
content: ...OR, is the TINY BASIC entered, line by line, by way of a lap-top, conventionally, first, then downloaded into the GIGATRON hardware.Missed that, watching the various YouTube coverage.Thanks

author: ataradov
author_rank: Super Contributor
timestamp: July 11, 2021, 04:36:51 pm
content: The basic interpreter is located in the ROM along with the font. You enter the program that is stored in the RAM and is executed from the RAM.
Will this Power Charger Work with Camera? - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: July 11, 2021, 06:26:05 am
content: Hello,The camera consumes 220 mAh and requires 1A - 2A 5V power source.Will it be compatible with LG smartphone charger? It's 5.1V, 0.7A.Thanks

author: magic
author_rank: Super Contributor
timestamp: July 11, 2021, 06:53:50 am
content: The camera consumes 220mA, because mAh is a unit of charge rather than current.The number itself is consistent with 90 hours run time on a 20Ah power bank so probably correct.Unless it draws some large peaks in excess of 700mA, and I doubt that it does, it will run on this charger.5.1V is within the 4.75~5.25V range which is allowed on USB ports, so the camera should take it. You may want to check if no load voltage doesn't significantly exceed the rating or if there isn't serious ripple. But it looks like a switcher and not some no-name one so hopefully OK.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: July 11, 2021, 07:35:22 am
content: @magicThanks. So if I connect it to LG charger with 0.7A andhypotheticallycamera draws 800mA what will happen? What will happen if camera draws 1000mA?

author: SeanB
author_rank: Super Contributor
timestamp: July 11, 2021, 11:24:34 am
content: In most cases the current ratings of a name brand charger can be exceeded for short periods without harm, and for a camera the current peaks are for a few seconds to charge for electric flash, and then the power draw is typically very low, with the odd peaks when taking images or writing to flash memory. This one draws 220mA, so likely will run on the LG charger no problem.The problem comes with no name knock off chargers, which often are unable to meet the specified power draw for more than a second or two, if they can actually meet them at all. Basically if the case is incredibly small for the ratings, or it runs hot enough to be uncomfortable to hold for more than 10 seconds, it is being overdriven, and will fail in short order, plus it is not likely to meet any sort of standards approval regarding insulation stand off voltage, creepage and clearance internally, and is likely using sub standard components being operated at or beyond the maximum rating, so giving a short life before they fail, and then you hope the failure is not going to destroy the equipment plugged in to it, or injure the user.
BTLE to BT (non-BLE) HID keyboard bridge? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: July 09, 2021, 10:21:50 pm
content: I bought a beautiful Logitech BT keyboard, marketed as "Compatible with iOS 5 or newer", except that my old iPad 2 doesn't see it (iPhone 8 sees it just fine, as does my 2 yr old Android...)How would I go about making an HID bridge - a device which has both BLE and non-BLE bluetooth (whatever you call it) and it would simply forward the keystrokes received on the BLE adapter to the iPad 2, connected to the NON-BLE BT adaptor ....I'd pair my Logitech BLE keyboard to the BLE BT adaptor of this "bridge", and then pair the iPad 2 to the non-BLE, standard bluetoothThanks, if you have any solutions, I possess ESP32, ESP8266 and a vast array of gizmos of other sorts, and a few R/Pis, Arduinos etc.
Productivity Commission Draft Report on Right to Repair in Australia - Page 1
Forum section: electronics / general

author: sandalcandal
author_rank: Unknown
timestamp: July 09, 2021, 01:58:09 pm
content: I think many members of this forum and Dave himself are supporters of right to repair. One of the really important developments I found out about at the Australian Repair Summit earlier today was the existence of thedraft report by the Productivity Commission on Right to Repair in Australia. They are currently taking further information and feedback on the draft report.Similar documents such asthe ACCC Report into The New Car Retailing IndustryandNixing the Fix: An FTC Report to Congress on Repair Restrictionsin the US have been essential in setting a precedence and getting legislators to move and move in a favourable direction.Submissions close Friday 23 July 2021. Any submissions, even brief comments will be important to building the case for right to repair in Australia. This is the final opportunity to make contributions before the final report.https://www.pc.gov.au/inquiries/current/repair#draft
JBL creature touch volume not working when not grounded - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: May 25, 2020, 09:41:32 am
content: I have one of these JBL creatureAnd the touch buttons only work if it is connected to a device that has EARTH/GROUND.The Creature's SMPS wall socket side has just the line and neutral, no EARTH.If I connect it to my TV that has only line and neutral volume does not work. If I connect it to my keyboard that has an earth at the wall socket the volume works.Also interestingly... if I touch the negative terminal of the audio input plug and touch the volume it works.Could someone explain the reason why earth is required? Is there a work around it or it is a natural limitation of this product?Is it silly to add a 3 pin socket to the primary side of the SMPS and connect the ground to the negative terminal of the secondary side. Similar as when you ground the negative rail?

author: Kaluluka
author_rank: Contributor
timestamp: July 09, 2021, 06:29:20 am
content: Hi!I know , this is a bit old posting , but anyway:Do you use original JBL power supply for it?I ask because: Original Power supply provides AC 18 Volts , not DC!Regards,

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 09, 2021, 07:46:58 am
content: It's probably a capacitive touch sensor relying on a ground reference. If the machine is not grounded when you touch it, it will just remain floating and have no potential difference to trigger the sensor. (you also create a potential by connecting yourself to the DC common point). If it's just a 2 pin AC transformer, it'll be relying on something like inter-winding capacitance (or have some sort of Y cap across it, unsure, haven't had one of these to examine).Other capacitive touch sensors such as those for screens get around this by referencing to themselves through creating a tiny AC field feeding back on itself that gets disturbed when contacted, and can electronically filter out anything not a finger or stylus that recreates that feild distortion, basically like a metal detector except with capacitance instead of inductance.
Google (internal) Comics - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: July 08, 2021, 04:05:17 pm
content: Somebody quit Google and released a bunch of internal-only Google comics:https://goomics.net/Source:https://otw20.com/viewtopic.php?p=9166#p9166

author: magic
author_rank: Super Contributor
timestamp: July 08, 2021, 04:13:06 pm
content: If you spend a few years on some shithole filled with Silicon Valley software drones such as "H".N. you won't even find it funny. Man, I hate those people.
North American XB-70 Valkyrie - Feature from the National Museum of the USAF - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: July 06, 2021, 10:35:36 pm
content: Nice presentation on the XB-70.

author: bdunham7
author_rank: Super Contributor
timestamp: July 07, 2021, 12:34:22 am
content: Imagine reviving that design with modern engine technology.

author: Stray Electron
author_rank: Super Contributor
timestamp: July 07, 2021, 01:02:26 pm
content: Quote from: bdunham7 on July 07, 2021, 12:34:22 amDesigning building, flying and troubleshooting the XB-70 and similar experimental aircraft is what allowed us to develop "modern" engine technology and "modern" aircraft designs.Go back and read about the history of the Bell X-1. It was the first manned aircraft to fly faster than the speed of sound. Today faster than sound flights are routine.
Use wifi from phone on android tv box - Page 1
Forum section: electronics / general

author: nvidia
author_rank: Regular Contributor
timestamp: July 06, 2021, 01:51:29 am
content: I am 2.5 meters away from the router but wifi is so slow it downloads at like 30kb-40kb a second box is only used for emulators but i need wifi to download box art retroarch cores ect i cant hook it up to ethernet as there is no safe place to run a cableIs it possable to use my old andoid phone via usb to teather it to the android box to use it with the phones wifi i did this before on an old pc that had no wifi and it worked not sure if i can do it on an android tv box

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 06, 2021, 12:41:10 pm
content: Sorry... I don't understand what you are saying...There are 'unmetered' Broadband links, that are only limited by the degree of service from your Provider.Then there are 'Metered' links, like over a 'Cell-Tower' for the likes of mobile phones that are out of range...'Tethering', is a method of utilizing another linked service, but that is ONLY at the speed/data allowance ofthe 'service'/'phone' that you are 'tethering' to???This has nothing to do with the Broadband link that you have & can use via your broadband provider??
Cheap SMT enclosed trimpot - Page 1
Forum section: electronics / general

author: peter-h
author_rank: Super Contributor
timestamp: July 01, 2021, 03:07:48 pm
content: I am after something like thisbut not at the Bourns price of ~60p (1k+).One can get "cermet" trimpots down to 10p but they are the open type which are easily knocked and movedThe product is an open PCB until it goes in the case, and it could be knocked.And I don't want to use the really crappy carbon ones like theseI am pretty sure there are chinesecermetSMTtrimpots around the 10p area but can't find any... plus most chinese stuff is poor QA so hard to know which items are worth looking at.The product is quite cheap so other options (e.g. potentiometer chips with an SPI port) are not an option. I have other options e.g. put a number of resistors on the PCB with blobbable pads and blob them in production... would be cheap enough for sure.

author: ebclr
author_rank: Super Contributor
timestamp: July 03, 2021, 12:57:40 pm
content: Can this one solve your problemhttps://detail.tmall.com/item.htm?spm=a230r.1.999.14.5f83523cd0Xhor&id=640257564693&ns=1

author: peter-h
author_rank: Super Contributor
timestamp: July 03, 2021, 03:06:33 pm
content: That one is an open one, which can be nudged in board handling.One can get those for 10p/10c.

author: ebclr
author_rank: Super Contributor
timestamp: July 05, 2021, 05:26:08 pm
content: https://item.taobao.com/item.htm?spm=a230r.1.14.135.39591d64RJLfCm&id=649463941968&ns=1&abbucket=0#detail
Estimate the nominal impedance. - Page 1
Forum section: electronics / general

author: ampliwire
author_rank: Newbie
timestamp: July 03, 2021, 07:51:07 pm
content: Hello guys,quite new here..I did an impedance sweep over a bookshelf speaker, and was woundering what in this graph do you use to tell the nominal impedance?The chart contains several different impedances, so I have never figured out what/how you tell the nominal impedance from this..

author: bdunham7
author_rank: Super Contributor
timestamp: July 03, 2021, 08:03:09 pm
content: Nominal literally means 'as named', so it is whatever the manufacturer or whoever says it is.With speakers, the typical amplifier isn't bothered by high impedance within reasonable bounds, but can be overloaded by low impedance. Since speakers typically have these high and low impedance peaks, the nominal impedance is generally called a little higher than the low points, and then usually in powers of 2--2/4/8/16 ohms. That's just a tradition and really only applies to normal hi-fi speakers, not PA or other types. There's no reason you couldn't have a 6 ohm or 10 ohm nominal rated speaker.I would call this one an 8 ohm speaker and I don't think too many would disagree.
Mystery Part TO92 marked 2T011 - Page 1
Forum section: electronics / general

author: charliedelta
author_rank: Regular Contributor
timestamp: June 14, 2021, 09:47:56 am
content: Trying to find out what the specification are of this part marked 2T011 or maybe 2to11.Its in a TO-92 package.I did search everywhere, no hits?Anyone have any clues. It's in a USA manufactured Ultrasonic leak detector.Lots of 2n2926's on the board marked in Yellow and Green so its very early vintage.Thanks

author: exe
author_rank: Unknown
timestamp: June 14, 2021, 10:04:59 am
content: Do you have a picture of the board and picture of the part?

author: charliedelta
author_rank: Regular Contributor
timestamp: June 16, 2021, 08:35:36 am
content: Yes I do see attached. The device behind it is the same one with the same markings.

author: exe
author_rank: Unknown
timestamp: June 16, 2021, 12:54:57 pm
content: I'd desolder one of these and put into a transistor tester. This at least will give some info.My best guess it's a pnp bjt, but not sure which one.

author: charliedelta
author_rank: Regular Contributor
timestamp: July 03, 2021, 09:43:31 am
content: I pulled the part.BJT PNP Hfe 215, Ube 693 and Ic 6.2MA on the chinese transistor analyzer.A BC557 might be a close match, but I have not looked for match exhaustively.
Looking for an old youtube classes about NN, ML and AI 101 - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: March 12, 2021, 12:07:31 pm
content: There was an old series of 10-20 videos, on a channel that back then was having only this class, an intro about neural networks and AI in general. Narrated by a feminine voice, full of diagrams and visual content, yet the focus was still on the content and not on the presentation. Short in length, 10-20 minutes/episode, more like a presentation than like a class.It was especially well suited as a bird eye view over the whole AI field, with main type of NN, each episode about a certain type of NN, and what is the best use for each type (classifiers, speach recognition, text generators, etc.), with concise explanations about the internal of each.I am searching for about an hour now, and couldn't find it any more. Maybe it was deleted.Anybody else happened to know that series and has a link for it please?Also, I've noticed in all the channel I am subscribed to, there are no videos older than 8 years.Is this just a coincidence, or the older content is automatically removed from YouTube?

author: RoGeorge
author_rank: Super Contributor
timestamp: July 02, 2021, 11:44:16 pm
content: .........Three months later ...Found it!Deep Learning SIMPLIFIED by DeepLearning.TV
JLCPCB - website not working AGAIN?! - Page 1
Forum section: electronics / general

author: Yansi
author_rank: Super Contributor
timestamp: February 15, 2021, 08:30:00 pm
content: Normally, I wouldn't start a thread like this, but lately, I am getting quite disappointed by the service. But not in terms of PCB quality, but their damn website.Like about week ago, their website was completely down, returning 500. Now you can't log in, because "Whoops, looks like something went wrong.".Every freakin' time I need to do some more time critical stuff with them, their fakin' website is broken again.Please don't tell me to clear browser cache or the rotten cookies or these fairy tales. This needs to be fixed on their side and I always eagerly try from multiple devices across different platforms, to exclude error on my side.Now I am siting desperately waiting to get info for my pissed customer when the boards will be finished.Rant over.Y.

author: eliocor
author_rank: Unknown
timestamp: February 15, 2021, 10:52:46 pm
content: now (from Italy) it is working....Maybe you can try to access the website via a VPN

author: retiredfeline
author_rank: Frequent Contributor
timestamp: February 15, 2021, 11:03:51 pm
content: https://downforeveryoneorjustme.com/jlcpcb.comWorking from here. DIdn't try to login though.

author: tooki
author_rank: Super Contributor
timestamp: February 16, 2021, 12:45:06 am
content: Quote from: retiredfeline on February 15, 2021, 11:03:51 pmFunny thing, just a few hours ago, I learned that downforeveryoneorjustme.com was originally created by a university friend of mine while he was working at Twitter (he was the lead developer of the original Twitter API). I've been using it for years and years but didn't know he'd been behind it!

author: Kleinstein
author_rank: Super Contributor
timestamp: July 01, 2021, 04:36:20 pm
content: The beginning of february is the Chinese holiday-season. In addition to the normal web problems with browser updates that change the behaviour of the browsers, there are additional difficulties with regulations / limitations on international internet transfers from china. The slightly longer outage could well be just from the holidays. There would be not much production at this time too, so the delay may not be that bad. The web-site is not perfect, but also not that bad either. I don't remember odd / funny translations, so the fun part is missing a little.
Is the reading of a 'moving iron' type analog ammeter skewed by power factor? - Page 1
Forum section: electronics / general

author: thomastheo
author_rank: Regular Contributor
timestamp: July 02, 2021, 04:24:06 pm
content: I had a discussion about this today, and couldn't answer adequately, so perhaps one of you can help. Say you are measuring AC current into an inductive load with a poor power factor, and are using an old-fashioned analog ammeter with a moving iron mechanism, what will the reading show?

author: bdunham7
author_rank: Super Contributor
timestamp: July 02, 2021, 04:33:36 pm
content: In the case of an inductive load, where the power factor is solely due to phase shift and the current is still sinusoidal, the meter should read the actual current normally. The ammeter only knows what it sees across its shunt, it can't know about the phase difference between the current and the voltage across the load.

author: TimFox
author_rank: Super Contributor
timestamp: July 02, 2021, 04:45:23 pm
content: A "moving iron" or "moving vane" meter responds to the average value, i.e. mean of the absolute value of the current through the winding. The harmonic content of the current waveform will affect the rms value indicated, but the meter does not see the voltage across the load. A "moving coil" or "d'Arsonval" meter responds to the mean of the current or DC value, so it cannot measure AC directly, only through a rectifier of some kind.
Am I missing something or is sorting by price in Digikey broken? - Page 1
Forum section: electronics / general

author: ksoviero
author_rank: Contributor
timestamp: June 29, 2021, 03:42:55 pm
content: I've noticed that when I'm searching for parts on Digikey, if I sort by price it doesn't seem to work. It will "mostly" be sorted by price but there will be a few out of order. Given how simple sorting by price is from a database query perspective, I can't imagine they fucked that up and I must be missing something.Here is an example of what I mean:Note that the first one listed is $1.51 while six down there is one listed for $0.90. That doesn't track...So, am I missing something here?Here is the search I'm running:https://www.digikey.com/short/vftrbwzf

author: ataradov
author_rank: Super Contributor
timestamp: June 29, 2021, 04:24:11 pm
content: Yes, it is broken like this, it is not you.We already tried to figure out how they managed to screw that up, but none of the theories made any sense.You can try to report this to them, they say they fix the issues. But they clearly have not fixed this since last time it came up.

author: james_s
author_rank: Super Contributor
timestamp: June 29, 2021, 05:22:01 pm
content: They're using Agile methodology to develop the website, so expect it to be broken in new and interesting ways at whatever their deployment interval is. The quality of the work we've seen so far suggests that anything they do manage to fix will come along with something else being broken.

author: Peabody
author_rank: Super Contributor
timestamp: June 29, 2021, 10:54:27 pm
content: I found that Digikey search in general worked better if I was signed in.

author: Whales
author_rank: Super Contributor
timestamp: June 30, 2021, 01:39:33 am
content: I've had this on element14 before too. I assume it's intentional sponsored placement (it only seems to happen with big-brand parts). Really annoys me.
Part supplier scammer - Page 1
Forum section: electronics / general

author: Chimaera
author_rank: Newbie
timestamp: June 25, 2021, 06:49:21 pm
content: Hi EEVBlog,First time posting, thought this experience was worth sharing.My company received an unsolicited part quote from SenPro Electronics (senproelectronics.com) claiming to have a large number of microprocessors in stock for a very good price. When asked where they got our information, they claimed they received it from an quote request we submitted to a different supplier on Octopart (wouldn't say which one).Naturally we were skeptical of their legitimacy, and when we voiced our concerns their representative (Brian) called to discuss. Brian had a Bronx style accent and tried various tactics to try to convince us that they were legitimate, and that they were simply reselling OEM part overages.After some internet searching we came across this blog post on eria.com:https://www.erai.com/erai_blog/3176/desperate_buyers_targeted_by_scammers_during_chip_shortageI'm not affiliated with Eria, but they had valuable information that could potentially help people avoid making a costly mistake.Be careful what websites you use to submit RFQ's, and be sure to do your due diligence since there are a lot of shameless people out there.Hopefully, someone else finds it useful.

author: Bassman59
author_rank: Super Contributor
timestamp: June 29, 2021, 03:31:57 am
content: Quote from: Chimaera on June 25, 2021, 06:49:21 pmAssume every unsolicited contact is an attempt to scam you.

author: Bradlez
author_rank: Contributor
timestamp: June 29, 2021, 01:26:46 pm
content: This looks like one of the more elaborate scams out there. Like someone had to design the logos for all of these companies. I wonder if they were stolen by the defunct companies they tried to imitate as or they actually had someone in the scam house make them.
infrared proximity sensor as a touchless doorbell - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: June 26, 2021, 10:27:52 pm
content: some people are afraid of touching a doorbell!so what if the doorbell touched its self for you!will it work?range 10cm to 60cma doorbell able to detect the presence of nearby objects upto half a meter without any physical contact.beaming flood of pulsed infrared light into the street 24/7a week end DIY projectwill there be infrared 38KHz interference? with neighbors televisions?as 38KHz infrared sensor designs, are a lot easy to make or use then ultrasonic sensor designs.any touchless doorbell must run 24/7 without false alarms. from dogs or cats.any thoughts are welcome

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 26, 2021, 11:42:34 pm
content: Easiest solution is a cheap PIR module with the sensitivity turned way down.

author: amyk
author_rank: Super Contributor
timestamp: June 27, 2021, 01:29:52 am
content: Pressure-sensitive doormat.

author: Benta
author_rank: Super Contributor
timestamp: June 27, 2021, 04:12:21 pm
content: Yeah, the obvious choice is a cheap PIR.An alternative could be an IR proximity sensor:https://www.vishay.com/optical-sensors/fully-int-prox-amb-light-emit/Note the built-in ambient light sensor, which is almost always necessary.

author: SeanB
author_rank: Super Contributor
timestamp: June 27, 2021, 05:27:03 pm
content: Just buy a no touch switch, very common in access control as the way to exit the building without touching anything.Should be pretty much available all over the place, and cheap as well, with a reasonably good look.https://www.sdcsecurity.com/474-No-Touch-Wave-To-Open-Switch.htmYou just need a 12VDC supply for them, that is capable of providing 50mA of current. Must admit the US prices are pretty steep for them, the local price is under $15, for basically the same thing they charge $122 for in the USA. Must be made by the same Chinese OEM as well.
"ExplainingComputers" - "5 most annoying things" videos - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: June 23, 2021, 11:41:04 pm
content: Can relate. The physical designs of micro HDMI and USB-C are utter crap (Raspberry Pi "foundation" - looking at you!)This extremely sharp gentleman knows his stuff, and I agree:#1#2

author: GlennSprigg
author_rank: Super Contributor
timestamp: June 25, 2021, 12:48:26 pm
content: As far as I'm concerned, it's all down to 'Redundancy'. But mainly due to COSTS/Savings...You can't buy a Laptop now with a built in CD/DVD drive, to save costs and for 'room'. People/Companies made themredundant, not just due to technologies today, but to save money. Similarly, traditional USB 2/3 ports are becoming redundant,even though 99% of current users still want/need them!! They all now push for the new Type 'C' connectors, not only becauseof their apparent usefulness today, but to shift hardware to external devices externally, and save more money!!

author: tooki
author_rank: Super Contributor
timestamp: June 25, 2021, 03:54:18 pm
content: What’s wrong with ditching optical drives? They hung around in laptops far longer than most people needed them with any regularity. So why schlep it around all the time? Just plug one in when needed.USB-C has been sloooowly displacing USB type-A ports because they’re a lot smaller, can handle power, and because of Thunderbolt/USB 4 capability, which isn’t compatible with Type-A. (USB-C is not asuccessorto USB 2/3 as such: a USB-C connector can be USB 2, USB 3.x., Thunderbolt 3, or USB 4.)

author: langwadt
author_rank: Super Contributor
timestamp: June 25, 2021, 06:02:52 pm
content: Quote from: GlennSprigg on June 25, 2021, 12:48:26 pmnot having USB type is a bit annoying, but a built in CD/DVD drive would be totally pointless and has been for many years
One More Mystery Board - Page 1
Forum section: electronics / general

author: Ookpik
author_rank: Contributor
timestamp: June 24, 2021, 06:14:30 pm
content: Does anyone know what kind of device this board is from?The board has the Texas Instruments logo and appears to be from the 1960's.Any help would be greatly appreciated!

author: bob91343
author_rank: Super Contributor
timestamp: June 25, 2021, 01:02:28 am
content: Looks like a zener regulator board. Input to the power resistor, output on the 3 zeners in series and a bypass capacitor.

author: ChristofferB
author_rank: Frequent Contributor
timestamp: June 25, 2021, 07:02:31 am
content: Probably part of a card cage with multiple pcbs with the same connector on a back plane. The test points on the edge and the angled corners and corner lifting holes support this.

author: rsjsouza
author_rank: Super Contributor
timestamp: June 25, 2021, 11:23:54 am
content: Quote from: bob91343 on June 25, 2021, 01:02:28 amIndeed. The color coding should match the Zener's part number: 1N845? (grey-yellow-green? I can't figure that out from the photos).It could serve any purpose, but it is surely part of a larger backplane or test jig of sorts with the large connector. The size and type of PCB material hint to me it is late 1960s at the earliest.

author: amyk
author_rank: Super Contributor
timestamp: June 25, 2021, 01:36:33 pm
content: Related:https://ingeniumcanada.org/ingenium/collection-research/collection-item.php?id=1972.1357.001

author: Ookpik
author_rank: Contributor
timestamp: June 25, 2021, 04:54:24 pm
content: Thanks for all the comments, info and link!Here is a close-up of the components.

author: bob91343
author_rank: Super Contributor
timestamp: June 25, 2021, 05:41:48 pm
content: 1N648 zeners I think.

author: Fraser
author_rank: Super Contributor
timestamp: June 25, 2021, 05:50:55 pm
content: Looks like a power supply test card that applies a load to the power rail and a test point in the power supply (monitoring point) is extended out to the top of the card. The zener diodes may be a voltage limiter and the capacitor, noise reduction on the test points.The card is likely inserted into a backplane of a PCB card type rack as part of the test or alignment process.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 25, 2021, 06:10:09 pm
content: Quote from: rsjsouza on June 25, 2021, 11:23:54 amMid 60s they had those boards like that. This device is from 66 as evidenced by the cap date code.

author: Gyro
author_rank: Super Contributor
timestamp: June 25, 2021, 06:40:47 pm
content: I agree, it looks like a PSU monitoring / test board.Looking a bit closer at the PCB, it appears to be loading one supply rail whilst providing test points for another. The Black socket is presumably a common negative reference for both rails.

author: amyk
author_rank: Super Contributor
timestamp: June 26, 2021, 10:11:55 pm
content: Search Internet for "96214 TI" and you will find some more interesting stuff that could be related. "96214-{6 digits}-{1 digit}" seems to be their part numbering scheme. But this is the first 96214-627612-1 that Google knows about.
CuriousMarc talks with Bob Stern, the one and only Mr. Fancy Pants. - Page 1
Forum section: electronics / general

author: nixxon
author_rank: Frequent Contributor
timestamp: June 26, 2021, 09:25:13 pm
content: Two awesome guys chatting on Zoom about legacy HP/Agilent/Keysight stuff...

author: nixxon
author_rank: Frequent Contributor
timestamp: June 26, 2021, 09:52:48 pm
content: Oops. I forgot the linkhttps://youtu.be/Xmx9uc7Jb5QMy bad
Help Needed with mplab harmony display Manager - Page 1
Forum section: electronics / general

author: Solberg
author_rank: Contributor
timestamp: June 25, 2021, 11:56:40 am
content: HiI'm trying to open the "display manager" in mplab x harmony configurator. but nothing happens.Legato graphics composer opens fine.Anyone know what could be wrong?I'm running Ubuntu 21.04

author: Solberg
author_rank: Contributor
timestamp: June 25, 2021, 03:28:19 pm
content: It seems to be a linux problem only.Installed mplab on windows in virtualbox. And it works fine.
Connector identification help - Page 1
Forum section: electronics / general

author: Hornnumb2
author_rank: Regular Contributor
timestamp: June 24, 2021, 01:39:51 am
content: I have a few connectors that in need to order plugs for. Any help on identify these. They both have 2mm spacing. Just not sure what to look for. 1st 2 same and third different. Thanks

author: eti
author_rank: Super Contributor
timestamp: June 24, 2021, 01:59:06 am
content: Tried Googling "ca-288 rev:01 connector type"?

author: Hornnumb2
author_rank: Regular Contributor
timestamp: June 24, 2021, 02:34:52 am
content: Yeah that pulled up board but no mention of connector type.
How to RE-ENABLE Google sync on "Chromium" on a Pi ... for now - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: June 24, 2021, 01:07:35 am
content: How to RE-ENABLE Google's syncing of history, passwords, credit cards, logins etc, on Chromium, FOR NOW, after they so kindly decided to remove it for no sane reason (Google can be quite infuriating at times):# Tested only on my Raspberry Pi 400, fully up to date; I am sure this method is platform agnostic, ergo should work on most *nix systems #1:Code:sudo nano /etc/chromium-browser/customizations/00-rpi-vars2:Paste in the red parts AS IS, in that file (green parts are theexistingcontent of that file - make a backup if needed):CHROMIUM_FLAGS="${CHROMIUM_FLAGS} --force-renderer-accessibility --disable-quic --enable-tcp-fast-open--oauth2-client-id=77185425430.apps.googleusercontent.com --oauth2-client-secret=OTJgUOQcT7lO7GsGZq2G4IlT"Et voila! It works! Tested on my Pi 400 as below:PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"NAME="Raspbian GNU/Linux"VERSION_ID="10"VERSION="10 (buster)"VERSION_CODENAME=busterID=raspbianID_LIKE=debianHOME_URL="http://www.raspbian.org/"SUPPORT_URL="http://www.raspbian.org/RaspbianForums"BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
Good film on YouTube - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: June 23, 2021, 06:28:24 pm
content: I just had the good fortune to find The Man Who saved the World, a film from just a few years ago, about Stanislav Petrov on YouTube.https://en.wikipedia.org/wiki/Stanislav_PetrovHere is the wordy link"This Man Single Handedly Stopped All Out Nuclear War - The Man Who Saved The World - War Documentary - YouTube"Anyway, we who were alive in 1983 probably owe our lives to him.Those who were born later probably wouldn't be alive too. Curious what you all think.I think the story must have been a difficult one to tell.. and they handled it very well. Using sort of a recursive loop or a story within a story to explore the soldier's memories. It was tragic how the failings of the bureaucracy led to him being criticized by his superiors to some extent for not writing the incident up properly, according to their rules. He was too busy and did not have three hands..Recently, Ive really had a strong feeling the world is shrinking very rapidly, with all of our lives kind of tied up in one anothers and our being linked in inexplicable ways. This film shows how true that is.
Data Sheets or specs for power transistors SJ6915 and GM DELCO 900-6500 - Page 1
Forum section: electronics / general

author: RJTR
author_rank: Newbie
timestamp: June 23, 2021, 03:49:59 pm
content: I am working on two old BioRad 500v power supplies. One uses Motorola SJ6915 and SJ6916 transistors for pass elements. The other uses GM / DELCO 900-6500 transistors for pass elements. The circuit is almost identical to the MC1466L datasheet 250v 0.1A application circuit. I have tried contacting OnSemi , Digikey and just about everything I can think of to get a some data on there devices with no luck. Does anyone have a technical reference for these devices ? They are NPN devices in TO-3 case with Vces 1200v (approx) Vebo unknown and hfe unknown. I would appreciate any information the form could offer.

author: Benta
author_rank: Super Contributor
timestamp: June 23, 2021, 04:15:36 pm
content: The Motorola parts are custom marked, perhaps even selected parts.They would probably be MJxxxx types (2Nxxxx also posible), meaning bipolar power transistors in metal case (TO-66?) Ne way of telling which, but the selection wasn't that wide in those days. An old data book might help.The GM/Delco? No idea.
NAMM SHOW 2020 |JHS PEDALS | PAUL GILBERT - Pcb layout - Page 1
Forum section: electronics / general

author: IanJ
author_rank: Unknown
timestamp: June 22, 2021, 11:29:15 am
content: Hi all,Found this quite good..........Paul Gilbert (guitar virtuoso) at a show and the backdrop is straight out of some Pcb design software (which one?)....albeit mirrored.Ian.
Mystery Boards - Page 1
Forum section: electronics / general

author: Ookpik
author_rank: Contributor
timestamp: June 24, 2021, 12:48:25 am
content: Does anyone know what kind of device these boards are from?The logo of the top board is unknown while logo on the second board is for Burroughs.The boards appear to be from the late 1960's.Any help would be greatly appreciated!

author: ChristofferB
author_rank: Frequent Contributor
timestamp: June 24, 2021, 12:56:45 am
content: I like how it's a modern pcb but the designer has laid it out exactly like a turret board anyway -could '59 be design year?Burroughs mainly made early computers, adding machines and the like. Lack of diodes or actives means it's not logic boards. I think the other logo is an older Burroughs logo.

author: bob91343
author_rank: Super Contributor
timestamp: June 24, 2021, 01:43:56 am
content: It appears to be a voltmeter multiplier. The resistors are 1% and there is a trimmer to improve bandwidth. And those numbers are the date.
Any members from St Paul / Minneapolis MN? - Page 1
Forum section: electronics / general

author: WimWalther
author_rank: Regular Contributor
timestamp: June 21, 2021, 04:21:19 am
content: Howdy folks,New member here in St Small, MN. Due to hand tremors and bad eyesight, I cant do any SMD work except for the largest parts - and even then, its more a matter of luck than skill. Since SMD is now so common for hobby work, I'm hoping to meet someone local who'd be willing to handle the occasional soldering operation for me.I do have a couple friends from out of state who've helped me out in the past, but mailing stuff around is kind of a hassle, not to mention the costs.FYI - I'm a retired tube audio tech, and have tubes, sockets, related parts and even a bit of knowledge to share. I also have access to a fantastic local tube metrology outfit, if you need tubes tested or matched.Thanks,Bill / KF0AEE
UK Inward Processing Relief (IPR) for VAT - Page 1
Forum section: electronics / general

author: perdrix
author_rank: Frequent Contributor
timestamp: June 21, 2021, 03:07:29 pm
content: I'm trying to get my head around what I need to do and what a customer of mine needs to do so that I don't have to pay VAT on items (astronomical telescope controllers) sent to me for repair from outside the UK.The IPR application requires I specify a specific "Port of Entry", but how do I control that when I don't control the courier/postal service the client uses?Does anyone have experience of this? I almost appears that it needs a foot high pile of paperwork for something that should be simple!Yes, I have googled it and read a lot of web pages put up by HMRC and some freight forwarders, but so far I've not found a clear exposition.Any guidance gratefully received.I expect there's also some thing that needs to be done so the client doesn't pay tax on the full item value when it is returned to themThanksDavid
Probing individual transistors on an TSMC 7mm node IC. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: June 01, 2021, 05:56:59 am
content: Talk about probe tips. Never see one of these on a DVM LOL....Part 1 of 2...

author: BrianHG
author_rank: Super Contributor
timestamp: June 20, 2021, 05:14:04 am
content: Part 2 of 2:Enjoy...
Tequipment discount still in effect? - Page 1
Forum section: electronics / general

author: jrmymllr
author_rank: Regular Contributor
timestamp: June 18, 2021, 11:07:26 pm
content: I ordered a scope from Tequipment several years ago using a discount code. I *believe* I might remember what it is, but it didn't work. Is it still in effect? If so, can anyone PM it to me?

author: MarkF
author_rank: Super Contributor
timestamp: June 19, 2021, 12:45:22 am
content: There were two codes. Are you using the new one?https://www.eevblog.com/forum/testgear/eevblog-members-discount-at-tequipment/msg2140861/#msg2140861

author: Brumby
author_rank: Unknown
timestamp: June 19, 2021, 12:52:14 am
content: If that doesn't work, try this suggestion:Quote from: tequipment on March 09, 2021, 05:45:59 pmThe request has been made to NOT make the code publicly available - so, if it has slipped out, it will likely be changed.
Datasheet for old Motorola IC - Page 1
Forum section: electronics / general

author: Deimos
author_rank: Newbie
timestamp: June 18, 2021, 06:58:48 am
content: Hello all, have watched Dave's Youtube channel for years and finally signing up here, but have browsed the forums for a long time too. Just have not done much with electronics in some years now. Not sure if this is the correct sub forum for this question.Question, can anyone point to a datasheet to this IC in question? It is the larger one in the photos designated as U1, I can't seem to find a datasheet for it at all, appears to be a Motorola chip. I did a bit of electronics repair growing up / tinkering, so have looked up tons of datasheets over the years, but can't seem to find anything on this one.This circuit is out of a basketball score counter / countdown timer, 30 year old cheap arcade style unit. It works as far as I remember, just curious about the chip after pulling the board to clean the unit.I know it's a slim chance on this, but thought I'd ask. Thank you.Printed on chip so you don’t have to type it.SC88893PCHSS 51902C61ALLUS9030

author: Ian.M
author_rank: Super Contributor
timestamp: June 18, 2021, 07:51:56 am
content: I believe 'SC' was Motorola's prefix for 'Special/Custom', i.e. 'house' numbered chips made under exclusive contract for a specific customer. Your one *may* be a mask-programmed variant of a Motorola microcontroller.AFAIK, Motorola never publicly released datasheets for 'SC' parts (as they couldn't be sold to any other customer), so unless the original customer published (or leaked) data, you are S.O.L.

author: Benta
author_rank: Super Contributor
timestamp: June 18, 2021, 09:21:42 am
content: Yep, mask programmed microcontroller. No way to know what's in there.

author: amyk
author_rank: Super Contributor
timestamp: June 18, 2021, 01:28:20 pm
content: Mask set 2C61A = MC68HC05P.

author: Deimos
author_rank: Newbie
timestamp: June 18, 2021, 05:12:19 pm
content: Thank you to everybody that replied, I appreciate it. Just had this apart and was curious as I have been on tons of other items over the years. Again I appreciate the replies.
Which Power Adapter/Charger for Portable Radio? - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: June 17, 2021, 10:38:35 am
content: Hello,I want to buy portable radio that can work on included 1000mAh lithium battery or power adapter/charger which is not included.Attached are photos of radio's power input specifications and 2 chargers that I have at home. Which charger should I use?Thanks

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 17, 2021, 08:09:54 pm
content: Lithium battery systems have internal current regulation. It will always take 500mA as long as the voltage is 5V, just like USB devices do.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: June 18, 2021, 06:08:25 am
content: What if I won't use lithium battery and plug radio in the mains? What will regulate voltage?
So I'm not sure when this happened, but it's neat I guess (Google Search result) - Page 1
Forum section: electronics / general

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 16, 2021, 12:49:53 pm
content: For some reason, either Google, or most browsers, don't send search referral data, so it doesn't show up in my logs, and it can be a bit cryptic where hits are coming from. This however is pretty clear...What happened to all the other calculators, I feel like a lone tree standing in a forest nearly leveled by a storm..??Tim

author: harerod
author_rank: Frequent Contributor
timestamp: June 16, 2021, 05:54:01 pm
content: Congratulations. When searching "thevenin calculator" in google.com or duckduckgo from Germany, your page is the runner up among several alternatives.