hybridfree/eevblog-posts huggingface dataset:
Lithium Ion Batt. Storage - Page 1
Forum section: electronics / general

author: BILLPOD
author_rank: Frequent Contributor
timestamp: August 23, 2020, 06:24:48 pm
content: Good Morning All,For several years I've been harvesting the 18650 Li-ion cells out of laptop batteries. I've weeded out the bad ones and charged up the good ones. I've accumulated around 20 and am arranging them in a cardboard box. I know there must be a better way, so does anyone have a good system that works for them?I've looked online and see some small plastic boxes for this use, but nothing that can hold upwards of 20.

author: tooki
author_rank: Super Contributor
timestamp: August 23, 2020, 09:58:29 pm
content: It’s not hard to find ones that hold 10 cells. They cost peanuts on Ali:https://www.aliexpress.com/item/4000943546576.html

author: ledtester
author_rank: Super Contributor
timestamp: August 23, 2020, 10:38:03 pm
content: Last year I found some nice small clear storage containers at Walmart which holds about 28 cells in a stack of 5 layers. It might be the kind of product, though, that's only available for one season -- i.e. some sort of special buy. I would just check your local Walmart/Target/Staples to see what they got.As the number of cells increases, what you use for storage will also change, e.g.:https://youtu.be/7wqPOhqILrE?t=2m50shttps://youtu.be/akLOCPeKavc?t=45s

author: Nusa
author_rank: Super Contributor
timestamp: August 23, 2020, 10:44:44 pm
content: I'd just appropriate a food storage container from the kitchen/store. If you later get more than it'll hold, get another container the same size. They'll stack.

author: shakalnokturn
author_rank: Super Contributor
timestamp: August 24, 2020, 12:39:20 am
content: Same here I have about 1kWh worth of 18650's stored in various plastic boxes then maybe another 2kWh that need testing.The next worry is the damage they could cause, I'm considering making a large sandbox to bury all the little plastic boxes in.

author: station240
author_rank: Unknown
timestamp: August 24, 2020, 09:50:00 pm
content: Another option get some of the standard cell holders like this 4x5 one.https://www.aliexpress.com/item/4000126245501.htmlPut one on the bottom, put all the cells in with the + at the top, then jam the second holder on the top.Holds the whole thing secure, till you need the cells.

author: duckduck
author_rank: Frequent Contributor
timestamp: August 24, 2020, 10:03:52 pm
content: Quote from: shakalnokturn on August 24, 2020, 12:39:20 amSome hobbyists that own remote control vehicles use flame-resistant battery storage bags for storing their Lithium Polymer batteries. I keep mine in a terracotta pot in the garage. LiPo batteries are (in)famous for spewing flames when physically abused.
Carbon-14 based diamond beta decay battery technology - Page 1
Forum section: electronics / general

author: bson
author_rank: Unknown
timestamp: August 27, 2020, 12:57:47 am
content: Ran into this... Intriguing. I wonder if it can be made economical, and without the atom haters have a spastic meltdown.https://newatlas.com/energy/nano-diamond-self-charging-batteries-ndb/14C seems to decay into14N, which is harmless, and could probably be released through diffusion.

author: sibeen
author_rank: Frequent Contributor
timestamp: August 27, 2020, 01:11:20 am
content: There is already a thread, started yesterday, in the Power & Renewable Energy section.https://www.eevblog.com/forum/renewable-energy/nano-diamond-self-charging-nuclear-based-battery-to-last-thousands-of-years/
Webbpage/database about Salvage and usable parts. - Page 1
Forum section: electronics / general

author: MrZwing
author_rank: Regular Contributor
timestamp: August 25, 2020, 11:03:03 am
content: HiI had an idea but not sure if it has already been implemented and if so i would be greatly interested in it.The thought if there is a page where you can search for example: search a Printer named "bandX lazor shooter" and get a list what things are worth to salvage from it. and on that be able to read about each usable part in this fantasy scenario a "no-name" LCD with pinouts that has either been found and linked to a datasheet or been revere engineered and get pinout and how to use it in that way.in short a website in Wikipedia format that gather information on what is worth to Salvage and how to use the salvaged parts from different products.
How to locate an underwater object with a compass? - Page 1
Forum section: electronics / general

author: Chriss
author_rank: Frequent Contributor
timestamp: August 20, 2020, 02:22:23 pm
content: Hi!Do somebkdy have any suggestion how can I locate the gps coordinates of an object in the water with a compass?These objects are close to each other. Something like from 30cm to 2.5m.From tools I have only a compass.Thanks.

author: Ian.M
author_rank: Super Contributor
timestamp: August 20, 2020, 03:10:19 pm
content: With a *really* good magnetic hand-bearing compass, up-to-date charts and a detailed survey of any local magnetic anomalies, you could triangulate off three well spread out, distinctly visible landmarks at accurately known latitude and longitude coordinates to get a position on the surface at best accurate to approx. +/-10 meters per Km of distance from the landmarks. You'd do better with DGPS in the boat which could reduce the surface position uncertainty by an order of magnitude or two. Transferring that position to the seabed in anything except shallow water is problematic due to currents and tides. In a still lake you *MIGHT* be able to maintain reasonable accuracy dropping a plumb-line.The pros will be using something like a network of DGPS equipped sonar buoys or a towed hydrophone array with surface GPS transponders at its head and tail.

author: Chriss
author_rank: Frequent Contributor
timestamp: August 20, 2020, 04:32:04 pm
content: These object are in a river, around 3-6m deep.Some wood pillars which circle are 70cm.I shoukd as a diver go down and locate them and if anypossibility to record the coordinates.The visibility is really poor, aroind 30cm.

author: 2N3055
author_rank: Super Contributor
timestamp: August 20, 2020, 04:35:50 pm
content: How do you expect to detect wooden (nonmagnetic) object with a compass that works on magnetic principle....

author: NivagSwerdna
author_rank: Super Contributor
timestamp: August 20, 2020, 04:38:58 pm
content: tape measure... actually two tape measuresanchor end of each at known different point... and then measure distance to each to point to be measuredplot result from triangulationsdoesn't sound like a fun job in that viz

author: Labrat101
author_rank: Unknown
timestamp: August 20, 2020, 06:25:01 pm
content: compass is useless for wood you require sonar or echo beacon . ultra sound would also work at close distance .

author: tggzzz
author_rank: Super Contributor
timestamp: August 20, 2020, 10:53:32 pm
content: Quote from: Chriss on August 20, 2020, 02:22:23 pmFind somebody who knows where the object is, and say "if you tell me where it is, I will give you this compass".

author: cdev
author_rank: Super Contributor
timestamp: August 21, 2020, 02:41:07 am
content: Have a bunch of boueys that can seve the GPS locaion and attach to a bouey\\and a rope and an sold achor
No more youtube email notifications - Page 1
Forum section: electronics / general

author: ornea
author_rank: Unknown
timestamp: August 20, 2020, 06:48:28 am
content: It appears I am one of the 0.1% of users that relied on emailed notifications about recent creator uploads.Anyone else find this annoying?How do norms get notified that creators have uploaded?androidpolice.com/2020/08/15/youtube-will-end-email-notifications-for-new-videos-on-august-13/

author: ataradov
author_rank: Super Contributor
timestamp: August 20, 2020, 06:58:23 am
content: I use RSS. They made it more annoying to use over time. Previously you could just subscribe to one feed with all your subscriptions, now you have to subscribe to each channel individually. I'm afraid that's going to go away soon too, and then a lot of channels will not see my views. I'm not going to waste time by active going there.
The Fairchild 9960 & Counter MicroLogic - DCTL  - Page 1
Forum section: electronics / general

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: January 03, 2020, 03:33:42 pm
content: Hello AllI am currently repairing an old nixie tube timer counter unit made by the Advanced Instruments company here in the UK around 1970s vintage. Not being very familiar with old logic families I came across some multi-legged T0-5 packages that I thought at first glance were op-amps. However it turns out they are a very early form of 1960 logic devices "DCTL" designed for counting applications and driving nixie tubes.In my search for information about these I found what I think is an interesting article about the production of these and have attached a PDF etc.I am currently making a YT Video about repairing the counter and if anyone has any knowledge about the DCTL or The Fairchild Counter MicroLogic family I would be interested hear about it as an interresting side story to the repairMany ThanksRegards Chris – AKA AllTheGearNoIdeaGoogle Found This: The Fairchild 9960 & Counter MicroLogicThe 9960 is something of an odd device. It is part of a small series of ICs Fairchild produced in the 1960s called Counter Micrologic. The series included 4 ICs - a decade counter (9958), 4-bit latch (9959), NIXIE decoder/driver (9960) and a less-frequently-seen base-16 counter (9989). The series was intended for decade counter strings in instruments such as frequency counters and other digital meters. The electronic design puts the series in the RTL class and they typically operate with a 3.6V supply, although they are rated for V+ up to 5.5V. The 9960 has been found directly driven by TTL devices and 5V supply. The 9960 inputs sink 1.3mA @ +3.6V (high/logic-0) and open-circuit is equivalent to low/logic-1.The ICs of this series may be confusing to identify as the labelling can vary in form. The 9960 for example, may be identified as type 960 or may have a longer label such as "F 996079" or "U6B996079X".

author: SnoopyPaladin89
author_rank: Newbie
timestamp: August 18, 2020, 10:20:00 pm
content: I'm working on a Heathkit with the same chips. I found a pinout for the DIP versions its not TO-5 but its a startI found this while googleing the chips in the service manual.http://madrona.ca/e/nixieref/Edit: I found a scan of a 1969 Fairchild Databook It looks like it has the chips in TO-5 and DIP.http://bitsavers.trailing-edge.com/components/fairchild/_dataBooks/1969_Fairchild_ch1-5.pdf

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 20, 2020, 04:02:00 am
content: Ouch, that databook cost 25$ in 1969 which supposedly is 176$ today.Makes you appreciate instant free data, hm?
A relic from the 1960s - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 19, 2020, 04:58:22 am
content: https://youtu.be/6fB0W0jsvnkThat's all that's left ... I feel like we are in an Asimov novel and we are marveling over relics from the first empire ...
Binding posts for BMI-PSM3/UNI-T UTP3335T PSU - Page 1
Forum section: electronics / general

author: WaveyDipole
author_rank: Frequent Contributor
timestamp: August 19, 2020, 02:54:08 pm
content: I am working on a BMI-PSM3/UNI-T UTP3335T 3-channel PSU for which I paid a fairly high price as a working pre-owned unit in good order but unfortunately a binding post was broken in the post and needs replacing. A fairly easy repair I thought and settled for a discount with the seller.The unit does have some upgrade potential as the PCB is printed for 4-channels and populated with many of the required components but with the notable exception of a key voltage regulator IC. It just needs a few more parts for a second fixed channel of 3.3V which would be great for Arduino projects and the like.That aside for the moment, I am having trouble sourcing a suitable binding post to replace the broken one. The replacement I purchased (right on pic) from Aliexpress has two problems: 1) the shaft is a few mm longer; and 2) the shaft is narrower by 1mm - 3.9mm vs 4.9. The handful I have here do not fit either - all too short. I couldn't find an identical one anywhere and the couple of e-mail exchanges I had with Uni-T were very curt and basically a dead end. Does anyone know whether and where I might be able to source the exact same binding post?The second possibility is to drill out and widen the PCB holes marginally, but they are plated through holes and drilling would break the front-to-back connection. There are other vias are present from front to back, but not heavy duty enough to handle the current, so short heavy duty wires could be added linking front to back, but it would look a bit messy.On the replacement binding post, the beige plastic colar needs to be omitted in order for the shaft to be long enough to reach through the PCB and allow the nut to be screwed on. I am not sure whether the smaller diameter metal plate might cause stress against the plastic and crack the front fascia? The rear is re-enforced with a tubular spacer between fascia and PCB.
JBC or Pace ADS200 t210 Vs t245 Difference? - Page 1
Forum section: electronics / general

author: smurf786
author_rank: Newbie
timestamp: August 16, 2020, 06:17:56 pm
content: Hi Guys,I'm after a new soldering station and have narrowed my selection to JBC or Pace ADS200...I'm going to be using it for console repairs so will be doing hdmi ports hdmi retimer chips etc...What are the differences between the JBC cd2bqe, cd2bqe, cd2sqe, cd2se?Also should I get t245 or t210 handle? What are the differences between the handles?The Pace is about £260 compared to about £400 for JBC... Is there much difference performance wise?Thank you

author: thm_w
author_rank: Super Contributor
timestamp: August 17, 2020, 08:34:28 pm
content: Read the Pace threadshere. Look at the JBC website to see the difference between handles or find some youtube reviews. ADS200 is better value and cheaper tips.T210:https://www.jbctools.com/t210-handles.html(small)T245:https://www.jbctools.com/t245-a-general-purpose-handle-product-45.html(normal)Your going to want a hot air station as well.Should be in this area of the forum:https://www.eevblog.com/forum/reviews/

author: perieanuo
author_rank: Frequent Contributor
timestamp: August 18, 2020, 10:51:57 am
content: hi,just buyed a JBC cd-2bqe from eleshop and it think it's one of the top 3.I already used for years metcals starting from 1100 euros and up to 26.000 euros and many other soldering stuff.I did myself a solomon sl-30 based controller with atmega like 12 years ago.well this 500 euros jbc beats metcal imho.Pace it's not really my love, some people says heating big things is not lined with the 2bqetake the 245 of course.the bits and the station are not cheap or hobby-like, but I regret not buying this laterall the other soldering bench stuff is now in the drawer...only a portable sl30 still sleeps in my mobile repair caseregards,pierre

author: Shock
author_rank: Super Contributor
timestamp: August 19, 2020, 09:53:51 am
content: They both have similar heating/recovery speed but regulate a little differently near set temp. Power difference will be virtually unnoticeable under normal use, for fine smd soldering even less as fewer heating pulses are required.The Pace TD200 (aluminum!) handpiece is fairly slim and has a short tip to grip working distance. They do smd tips down to 0.2mm, so fine smd work is no problem.It's the Pace ADS200 with instant setback stand all day for me, it's not perfect but JBC doesn't even put the power button on the front of their station nor have a detachable stand. I don't like JBCs display/angle and that it doesn't really work well on a shelf. Pace is way cheaper to setup and they sell inexpensive durable cartridge tips.
Flipper, a Tamagotchi-radio-thing? - Page 1
Forum section: electronics / general

author: ceoxrad
author_rank: Regular Contributor
timestamp: August 12, 2020, 05:16:11 pm
content: Just came around this crazy stuff while scrolling on social media..basically it seems a simple RF transciever based on an off the shelf TI part.Maybe a polished dev-board kind of thing would have been cool if you are into that sort of stuff and like to write your own code.But what about that interactive dolphin nonsense?, it's hilarious.At least is open source so maybe if it ever gets into production may be usefulLink:https://flipperzero.one/

author: asmi
author_rank: Super Contributor
timestamp: August 12, 2020, 06:26:19 pm
content: It's a big success on Kickstarter. Already received over 40 times required funding.

author: MuhScopeBroke
author_rank: Contributor
timestamp: August 13, 2020, 12:45:52 pm
content: It could be cool, I wouldn't bash them though... I won't get behind every new invention but I won't shit talk them either

author: Back2Volts
author_rank: Unknown
timestamp: August 18, 2020, 10:31:42 am
content: Isn't it basically a tool to steal access codes? It sounds to me that a "user" can seat in a parking lot waiting to capture car remotes as car owners parks, and minutes later "use" one of the cars. Yes, it can be used for other than that, but the heavy interest in a pocket size format...
After market OEM MacBook Pro charger - Page 1
Forum section: electronics / general

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: August 17, 2020, 11:10:58 pm
content: I have disposed of all my non-Apple MacBook Pro chargers I have scattered around the house after watching the teardown videos a couple years ago. I happened to come across another one that was stashed away (one of the Chinese clone you find on any websites), and I decided to run a test to get some quantitative numbers.While charging my half-charged MBP with it running and engaging the high performance GPU, the charger exterior skin managed to exceed 183F at the center of the charger. The charger is propped up and only the narrow bottom edge is touching the floor. At this rate, you can easily get a burn by touching it, and I wonder if it even have a temp cut-off safety feature if it ever falls between two couch cushions. So it is definitely destined for the garbage can. If you have these chargers, heed the warnings that many have posted, you never know what you get and it is much better to buy a replacement directly through Apple.The weak link on the Apple charger is the cord, I have been through three of them due to defective cords. Now, I would desolder the cord on the clones before tossing them, and that would keep my original Apple charger working for a couple more years.

author: John B
author_rank: Frequent Contributor
timestamp: August 18, 2020, 01:11:20 am
content: The obsession with having things as compact or thin as possible doesn't help with thermal considerations either.
Someone still makes CRTs - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 17, 2020, 03:11:11 am
content: hmm!

author: eti
author_rank: Super Contributor
timestamp: August 17, 2020, 05:54:29 am
content: Shove your lockdown, I'd be there and no mistake.

author: LaserSteve
author_rank: Super Contributor
timestamp: August 18, 2020, 12:09:06 am
content: These folks still make the tubes...https://www.thomaselectronics.com/manufacturers/Steve
Woman hacks a Tamagotchi - I like this! - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: August 17, 2020, 12:24:56 am
content: A very old article, but no less fun:https://hackaday.com/2013/05/24/tamagotchi-rom-dump-and-reverse-engineering/https://web.archive.org/web/20130531051518/http://www.kwartzlab.ca/2013/05/first-glimpse-soul-tamagotchi/code-3/
Advice to search, filter, identify outstanding teams? Dehaystacking needles. - Page 1
Forum section: electronics / general

author: iteratee
author_rank: Contributor
timestamp: August 20, 2020, 02:55:28 am
content: I do computer engineering - with software and computer science being the heaviest emphesis, with broadening research always ongoing elsewhere (EE and hardware focus in recent years). I suppose altogether about 15 yrs of rather hardcore technical study, ugh.I gather that quality industry experience... exists? Those I've asked say that learning from coworkers is an every day occurance, and is perhaps their primary knowledge source, which is amazing. I can't even think of an instance where I learned something technical from an actual person on a job. (or really ever)Anyway for, reasons, it would seem if I can't find an environment with decent condItions eventually then moving my career in a non-regrettable direction may be slow and painful. So I need to hunt for a thing I've never seen to find "conditions", but even having a good concept of the characteristics I'm looking for doesn't help when they're mostly invisible. Yes I've read the internet's ramblings about workplaces / adult daycare. Experience tells me It's way hard to glean very much about how other people work from just being interviewed. I usually don't even know who I'll end up directly working with.For the job itself I'd ideally target something in the vacinity of systems programming, library development, compilers / tools / related. I'm happy with anything relevent to my broad intrests provided I'm not wasting time learning nothing. But clearly the people are priority 1.This is hard because the researchable external appearence of a company and its products / services doesn'tnecessesarilyindicate qualities of the engineering culture, talent, or experience base. Are there more concrete non-obvious "tells" or red flags that can be researched ahead of applying or interviewing? Secret handshake perhaps?(Is it weird that I'd be elated to be the dumbest person in the office? God please make me dumbest for once! I just have to find a bunch of rare geniuses gathered in one place and convince them to hire somebody a bit dull.)
FCC Multiple Module Certification Strategy - Page 1
Forum section: electronics / general

author: awef
author_rank: Contributor
timestamp: August 14, 2020, 05:23:22 pm
content: I'm curious if anyone has experience certifying devices which span several rooms. An example is a smart home with a thermostat in a different room.I imagine if I have an Arduino-like device in Room 1, and a thermocouple in another room, it would be simple. Just certify this arduino-clone and be done. The thermocouple has no brains, no clock.Okay lets add a brain to that thermocouple and put it on an RS485 bus. So now there's effectively 2 arduino like things A) the main brain, B) the smart thermostat.Lets say my target is to sell a solution where there's a smart thermostat in a variable number of rooms, say 1-5 rooms.For the sake of simplicity, let's just say there's no significant EMI emissions regardless of # of main brains and smart thermostats.So could I save money by seeking just a single certification for both the A) main brain and B) the smart thermostat? I suppose why not right? It's just a single system with long wires. Put it all in the chamber and plot the graphs and be done!Okay but then someone wants to order an extra smart thermostat for a new room. Would i have trouble marketing/selling it since... that smart thermostat no longer is bundled with the main brain?What if someone likes my main brain, but needs qty 0 of the smart thermostat... why? because they're a cool hacker and just like my PCB or ... maybe their original PCB broke. Flooding of the basement where they have their main brain.So I'm thinking... would I really want to double my certification costs and separate these devices? Or could I get one certification that covers multiple parts and save money?Let me know what you thinkNo need to be a lawyer... just want your thoughts especially if you have been involved in something similar. We're asking some professionals as well but ... nobody knows everything right?
A very unfortunate TNY279PN released the magic smoke — violently - Page 1
Forum section: electronics / general

author: golden_labels
author_rank: Super Contributor
timestamp: August 08, 2020, 02:22:28 pm
content: A (most likely) Power Integrations TNY279PN was very unfortunate. Found in a BQT L7-630W that experienced a failure on the primary side.

author: jimdeane
author_rank: Regular Contributor
timestamp: August 08, 2020, 08:47:00 pm
content: You're going to need some really small bodge wires and solder tip.

author: tom66
author_rank: Super Contributor
timestamp: August 08, 2020, 09:21:45 pm
content: Interesting, it looks like the points of failure were the bond wires rather than the device itself.

author: golden_labels
author_rank: Super Contributor
timestamp: August 09, 2020, 10:08:41 am
content: Unfortunately I do not know, what has happened. I received the PSU in a non-working condition with information that it blows fuses in the apartment. The context and the wording suggests that the power supply experienced a few shorts in the two-digit amps range. Besides this poor chip, primary side had rectifier with shorts and epoxy on one leg broken out, at least one MOSFET killed and a 10A fuse blown. But only this one got hit so hard that it literally exploded.Coincidentally Zeptobars’ last post is aboutPower Integrations INN2605K. A far cousin that shares many features of this one. They also haveTNY264, a specimen from the earlier iteration of this family.Quote from: jimdeane on August 08, 2020, 08:47:00 pmI should also buy one of those fancy focused ion beam deposition devices to fix the transistor, which seems to be shattered into pieces. I have seen some used power supplies for those on eBay for a bargain price of $40k.

author: chris_leyson
author_rank: Super Contributor
timestamp: August 09, 2020, 10:35:19 am
content: I've seen Power Integrations LinkSwitch-3 parts leave a small crater where there used to be silicon. After two supplies blew up violently at a mere 2kV EFT test we don't use P.I. parts and probably never will.

author: newbrain
author_rank: Super Contributor
timestamp: August 09, 2020, 09:09:11 pm
content: Quote from: jimdeane on August 08, 2020, 08:47:00 pmYou are joking, but I once did something similar to a TO3 2N3055.Hacksawed away the top, resoldered the Emitter, and used solder to put back together the sliced case.I then used it in the 5V linear supply in my home-made-all-TTL-mains-frequency-synchronized 4 digits frequency meter (yes, max 1 MHz with a 7490 prescaler)It is still there, and after about 40 years it's still going! (not that I use it any longer...)

author: golden_labels
author_rank: Super Contributor
timestamp: August 14, 2020, 06:56:04 am
content: I don’t have tools to properly take photos of the die, but this is what I managed to squeeze from a cheap webcam “microscope”.
Is this chip balled ? - Page 1
Forum section: electronics / general

author: chinoy
author_rank: Regular Contributor
timestamp: August 12, 2020, 07:57:12 pm
content: On my way to doing my first chip level repair.The Chip in question is the Max98512B.Picture attached.My question is this new chip balled or do I need to ball it.I do not have a stencil for it.This is an insanely small chip 36 contacts little bigger than a pin head lol.Any tips to a first timer without a stencil ?.

author: flolic
author_rank: Frequent Contributor
timestamp: August 12, 2020, 08:37:01 pm
content: That chip is balled.I reball those under the microscope by hand, using thin, sharp needle to transfer balls.

author: chinoy
author_rank: Regular Contributor
timestamp: August 12, 2020, 08:52:11 pm
content: Do you repair phones.I have a doubt how do I know which chip to replace first this one or theAudio IC CS47L93Symptom is both speakers are dead. Both Mic are dead. And ear phone jack is dead.But blue tooth audio works. For Music and games and videos but not for calls.Samsung Note 9.So do I need to build up balls in the socket or just clean up the socket put in the new chip and heat ?.280c ok ?.

author: flolic
author_rank: Frequent Contributor
timestamp: August 12, 2020, 09:29:34 pm
content: I can't help you diagnosing problem with Note 9.Remove old chip and clean pads on the PCB with solder wick.Apply flux, put new chip and heat with hot air. 280C is to low, I am using 360C. But that vary from case to case.
reading wiring diagrams - Page 1
Forum section: electronics / general

author: hnjmkl
author_rank: Regular Contributor
timestamp: August 12, 2020, 08:34:33 am
content: I think the poor graphic definition of very old wiring diagrams is a felt problem, to repair a complex circuit you need to enlarge the sheet, but the definition gets even worse; I ask if there is a software able to remove the shadow on the sides of the graphic signs, alphanumeric characters, in short, make a straight line clean and defined, I tried with gimp but no filter works, I try to post a small portion of a circuit.

author: TimFox
author_rank: Super Contributor
timestamp: August 12, 2020, 01:18:10 pm
content: A photo-imaging software package (I use Corel Paintshop) has spatial filters that might help. Paintshop has "high-pass sharpen" that works on architectural photos to do a similar effect.
Trying to identify a source for a QFP 160 socket - Page 1
Forum section: electronics / general

author: SolderSucker
author_rank: Regular Contributor
timestamp: August 09, 2020, 03:02:07 pm
content: Hope this is the right area to post this, if not let me know.I need to get hold of a QFP 160 socket, all I have for reference is a board with one already fitted, see pic below:https://i.ibb.co/MhwcqZp/20181123-121751.jpgIt's made by Amp but I have been looking at Amp's website and other places yet can't seem to find the right socket (it's probably no longer manufactured). I need this for testing some old 160 pin QFP chips. I've found assorted test sockets but they are usually through-hole mounting only I of course need to surface mount this.

author: Benta
author_rank: Super Contributor
timestamp: August 09, 2020, 04:59:23 pm
content: Yamaichi perhaps?

author: SolderSucker
author_rank: Regular Contributor
timestamp: August 10, 2020, 09:53:55 am
content: Thanks, I was looking at their sockets but couldn't seem to find anything suitable.

author: Gribo
author_rank: Frequent Contributor
timestamp: August 11, 2020, 02:58:08 pm
content: Are you sure it is QFP and not PLCC?

author: SolderSucker
author_rank: Regular Contributor
timestamp: August 11, 2020, 03:08:48 pm
content: 100% positive, it's to take a chip with this kind of leg arrangement:https://i.ebayimg.com/images/g/IIUAAOSwdGFYqwSt/s-l1600.jpg(that's just a random image to show the type of legs the chip has).The sockets do exist, but seemingly they are hard to find these days.

author: Gribo
author_rank: Frequent Contributor
timestamp: August 11, 2020, 04:33:35 pm
content: https://www.mouser.ca/ProductDetail/Yamaichi-Electronics/IC149-160-023-B5?qs=5ZKUe%252BBgLwjPpnxCG%2F0fjQ%3D%3D250$ ouch.

author: Gribo
author_rank: Frequent Contributor
timestamp: August 11, 2020, 04:39:12 pm
content: Also, check out Ironwood electronics.https://www.ironwoodelectronics.com/catalog/Content/Drawings/socket_technologies.PDF

author: SolderSucker
author_rank: Regular Contributor
timestamp: August 12, 2020, 07:37:22 am
content: Quote from: Gribo on August 11, 2020, 04:33:35 pmOuch indeed! Somewhat out of my price range I'm afraid.

author: SolderSucker
author_rank: Regular Contributor
timestamp: August 12, 2020, 07:38:57 am
content: Quote from: Gribo on August 11, 2020, 04:39:12 pmThanks, that looks interesting.
Old radio magazines - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: July 24, 2020, 02:28:39 pm
content: Heaps of old radio magazines, some dating from the 1920s.Plug these text files into your download manager and away you go!Collection is searchable using recoll.https://www.lesbonscomptes.com/recoll/Edit -> zip file replaced because of forum technical problems. It became a .png file I posted in another section altogether.Edit #2 -> zip file replaced a second time! Forum keeps trashing it!

author: Dave8266
author_rank: Contributor
timestamp: July 28, 2020, 07:17:26 pm
content: Anyone other than me having issues with the .ZIP file?When I unzip it, it turns into a .CPGZ file.When I unzip that, it turns into a .ZIP file again, and the process repeats forever.On a Mac, for what it's worth. Problem could be on my end, so figured I would ask.

author: FireBird
author_rank: Regular Contributor
timestamp: July 28, 2020, 10:10:13 pm
content: That zip is actually a png and shows a screenshot from a Rigol scope.

author: rdl
author_rank: Super Contributor
timestamp: July 28, 2020, 11:28:24 pm
content: I downloaded the zip file a few days ago. There were three .txt files inside. Each file is a list of URLs.

author: Circlotron
author_rank: Super Contributor
timestamp: July 29, 2020, 01:09:50 am
content: Quote from: FireBird on July 28, 2020, 10:10:13 pmYou're right. Renamed it and it was a pic I posted here ->https://www.eevblog.com/forum/projects/transients-in-automotive-inductor-signal/msg3156136/#msg3156136The forum is broken.Edit -> zip file replaced. Hope it stays good.

author: GlennSprigg
author_rank: Super Contributor
timestamp: August 10, 2020, 11:31:10 am
content: Hi there 'Circlotron'. Did you sort out the download link??

author: FireBird
author_rank: Regular Contributor
timestamp: August 10, 2020, 12:07:17 pm
content: The replaced zip did work for some time but now it is another Rigol screen shot.

author: Circlotron
author_rank: Super Contributor
timestamp: August 10, 2020, 12:08:45 pm
content: Okay, it's replaced once more.PM me if it craps out again.

author: GlennSprigg
author_rank: Super Contributor
timestamp: August 10, 2020, 01:07:17 pm
content: WooHoo!!!Got them all ok now in that .zip file. Thanks!
NASA will no longer use offensive names such as "Eskimo" or "Siamese Twins" - Page 1
Forum section: electronics / general

author: Berni
author_rank: Super Contributor
timestamp: August 10, 2020, 11:02:57 am
content: https://www.nasa.gov/feature/nasa-to-reexamine-nicknames-for-cosmic-objectsIn order to not offend anyone, from now on the star nicknamed "Eskimo Nebula" will now be refereed to only as NGC 2392 and the galaxy pair nicknamed “Siamese Twins Galaxy” will now only be known as NGC 4567 and NGC 4568.This is getting ridiculous.

author: Zero999
author_rank: Super Contributor
timestamp: August 10, 2020, 11:31:34 am
content: Yes, it's retarded, butdo we really need about another thread bitching about political correctness gone mad?The last one got out of controlled and was eventually locked.

author: BravoV
author_rank: Super Contributor
timestamp: August 10, 2020, 11:34:16 am
content: +1 on stopping these talks, and to mods, lock please.

author: Simon
author_rank: Unknown
timestamp: August 10, 2020, 12:12:04 pm
content: We have had one of these already that descended into political bickering.
Looking for DC connector name - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: August 08, 2020, 02:02:57 pm
content: Is there a standard name for this type of DC plug/socket connection (see the picture below)?

author: mathsquid
author_rank: Frequent Contributor
timestamp: August 09, 2020, 03:58:23 am
content: "bi-pin" is more general than for this particular DC connector, but I think it fits.

author: magic
author_rank: Super Contributor
timestamp: August 09, 2020, 08:36:57 am
content: Tangential, but I have one of those switchable PSUs and its output at 3V is 3.7V and something within those connectors / adapters has crapton of resistance (>0.1Ω IIRC) on the ground side.

author: Axk
author_rank: Regular Contributor
timestamp: August 09, 2020, 09:55:25 am
content: mathsquid, magic, thanks!magic, mine is .3-.4 volts higher on each voltage, but looks consistent among the 3 units that I bought, so I think it's intentional.

author: oPossum
author_rank: Super Contributor
timestamp: August 09, 2020, 09:59:38 am
content: RadioShack calls them Adaptaplughttps://www.radioshack.com/collections/adaptaplug-tips

author: magic
author_rank: Super Contributor
timestamp: August 09, 2020, 11:10:10 am
content: There are different versions with different specs and different internals.Mine is a version with 3~12V output voltage, 2.5A rated output current plus an additional 1A USB socket. The problem with it is that the secondary regulator is a TL431 (≥2.5V) in series with an optocoupler (1.2V) so it simply can't regulate less than about 3.7VIts output voltages also are slightly higher than nominal, presumably to compensate cable loss at high currentsOh, and there is another problem: no OCP. The secondary rectifier can overheat and desolder itself when pulling >3A of current at 3V. The whole thing is kinda crap, but okayish if you are careful with it and understand the limitations.

author: JamesPatterson
author_rank: Newbie
timestamp: August 10, 2020, 08:26:29 am
content: I thought it was bi-plug too, but I see that is apparently too general of a description...
CE certification for tube amplifiers - Page 1
Forum section: electronics / general

author: Enceladus
author_rank: Contributor
timestamp: August 09, 2020, 08:45:12 am
content: Hi everyone! I was recently building a tube amplifier (not because of the "audiophile"-style sound, just because I like how they look) and got a bit confused: how do people actually certify such equipment if they want to sell it? I mean the technology is clearly obsolete so it doesn't meet any "green" standards, especially if it is some Class A amplifier. Also the power supply is super dangerous (400-600V DC) as well as the tubes are very hot. It looks to me that this kind of equipment doesn't meet any modern standards (e.g IEC 60335) on one hand, but at the same time you can find lots of tube amplifiers both on European and USA markets. I mean it will probably pass the FCC as long as you don't use a switch mode power supply but what about CE? The CE certification is not mandatory but I thought you have to have it to sell electronics in EU which means that somehow they passed it. If someone had experience with CE/FCC certification, could you please explain how it is possible? Thank you!!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 09, 2020, 11:08:15 am
content: I don't know about all of CE specifically. Most EMC standards are only concerned about emissions if there's a source inside; an audio amp has no source, it's not supposed to oscillate (do check that it's stable for all load conditions, mind) so that's easy.Safety isn't going to work if you leave it wide open. Metal mesh cover or something like that, no worry.Electrical safety rules are about what's touchable, and also single failure conditions. Glass I think will count as reinforced insulation, so that's fine, and a missing tube, the socket should be insulated (metal under the surface, can't reach it). You do need adequate insulation for the internal voltages, and a grounded metal enclosure is a good idea. (How to solve ground loop, is another matter.)I don't know what general touch safety rules there are, but that will set surface temperatures and such, and hence necessitate an enclosure. There may also be transportation rules for shock and vibe, handling a drop etc. More for mass production and merchantability than for one-off projects.Immunity should be easy enough. Commercial EMI test levels are comparable to signal levels, and tubes don't have the aggressive exponential relationship that transistors do. A little RF filtering might still be a good idea, to keep the signal completely clean.Surge and ESD basically don't matter. Surge is handled by the transformer and C-input rectifier. Tubes may wear due to ESD (causing internal breakdown maybe?) but rarely die of it.Tim
Identify vintage board - Page 1
Forum section: electronics / general

author: floppes
author_rank: Newbie
timestamp: August 08, 2020, 07:52:54 pm
content: A friend of mine found an old, framed board in the legacy of his wife's grandfather and asked me what it is.So far I found that it was manufactured byCDC (Control Data Corporation). It seems to be a 4K 18-bit-word memory expansion for an AB107/108. I found thismanualwhere you can find the equipment number BA201.I couldn't find any datasheet for the ICs with the golden labels. The logo looks like "AMI", but the board seems to be from the seventies and American Megatrents wasn't founded before 1985. The 18 pin count is rather strange to me.Does anyone have more info about the board/computer and an idea why the grandfather would frame it in plexiglass?

author: WattsThat
author_rank: Frequent Contributor
timestamp: August 08, 2020, 08:08:36 pm
content: The 1103 was the first commercial dram chip. Originally build by Intel in 1970, built under license by many and in your case, AMI (American Microsystems) in late 1974 (week 47).https://en.m.wikipedia.org/wiki/Intel_1103

author: DC1MC
author_rank: Super Contributor
timestamp: August 08, 2020, 08:16:52 pm
content: Well, that's a nice looking board for sure, I can speculate of this being one of the reasons to be framed.But the 1K RAM chips are the first commercial RAM of Intel, that launched the chipzilla as we know it.The ones on the board are not Intel originals but "second source", more details here:https://en.wikipedia.org/wiki/Intel_1103Another reason could be that your grandpa was involved in the design of the board that replaced a closed sized core memory. This was definitely worth of a celebration.Ten years later ('84) I was building Sinclair Spectrum clones with their Russian 16Kbit bigger brother clones, same beautiful package.EDIT: WattsThat bet meCheers,DC1MC

author: floobydust
author_rank: Super Contributor
timestamp: August 09, 2020, 05:35:20 am
content: 1103 1kbit DRAM $7.25 in 1974 (Solid State Sales, Mass.) or $38 today or $2,730 for them alone. It's a very expensive memory board.

author: floppes
author_rank: Newbie
timestamp: August 09, 2020, 07:44:59 am
content: Thanks a lot for your responses, that lifted most of the fog

author: KE5FX
author_rank: Super Contributor
timestamp: August 09, 2020, 08:25:29 am
content: Maybe send a link to this thread tobunnie. It would make a nice Name That Ware contest subject.
RS components catalogue CD-ROM ISO from 1995 anyone? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: August 08, 2020, 11:58:15 pm
content: Hello.Is there a chance I can find an RS componentscatalogueCD-ROM ISO from 1995/1996?Thanks so much

author: woodchips
author_rank: Frequent Contributor
timestamp: August 09, 2020, 09:22:31 am
content: Is this the RS catalogue on CD?Started end 1994, I have lots up to 2004 or so.Don't recall ever using any of them, no CD drive in those days, too expensive.

author: Zero999
author_rank: Super Contributor
timestamp: August 09, 2020, 10:12:51 am
content: Quote from: eti on August 08, 2020, 11:58:15 pmJust one question: why?I had a CD drive back then. I tried the Maplin catalogue, but it was crap, compared to the good old paper version. I didn't try the RS catalogue. i was still at school back then.

author: eti
author_rank: Super Contributor
timestamp: August 09, 2020, 05:10:08 pm
content: Quote from: woodchips on August 09, 2020, 09:22:31 amHello, yes that's it, the catalogue I'm after, thank you for replying.

author: eti
author_rank: Super Contributor
timestamp: August 09, 2020, 05:20:08 pm
content: Quote from: Zero999 on August 09, 2020, 10:12:51 amThanks for the story, it's nice to look back fondly at our past memories

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 09, 2020, 05:26:32 pm
content: I'm not digging through all thesehttps://archive.org/search.php?query=components+catalog&sin=

author: eti
author_rank: Super Contributor
timestamp: August 09, 2020, 05:27:41 pm
content: Quote from: Alex Eisenhut on August 09, 2020, 05:26:32 pmYes, archive.org is the FIRST place I always look for old things, and I looked for hours.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 10, 2020, 04:29:12 am
content: Quote from: eti on August 09, 2020, 05:27:41 pmHave you tried asking RS themselves? Also tryhttps://www.rrd.com/contactIIRC this is the company that published a lot of the 1990s CD-ROMS like catalogs and data books. I doubt they'd just give it to you but maybe they can say if the data still exists...Or torrents? Are those still a thing?
Forum hidden viewers - Page 1
Forum section: electronics / general

author: tggzzz
author_rank: Super Contributor
timestamp: August 08, 2020, 08:03:16 am
content: In the screenshot below there are a few oddities. I am the only member looking atthatthread, and there are 10 guests looking at it. 1:10 surprises me, but is probably transientBut what is a "hidden" viewer?I expect the answer is obvious, so simply point me to it

author: magic
author_rank: Super Contributor
timestamp: August 08, 2020, 10:30:17 am
content: BB forums have an option to hide your username from those lists.But I went through all those goddamn preferences and can't find it

author: magic
author_rank: Super Contributor
timestamp: August 08, 2020, 11:38:55 am
content: I was wondering what kind of paranoid people use it but this explanation makes perfect sense

author: golden_labels
author_rank: Super Contributor
timestamp: August 08, 2020, 02:09:13 pm
content: Quote from: tggzzz on August 08, 2020, 08:03:16 amEach client that doesn’t store cookies is being counted separately with each requests it makes. That mostly includes web crawlers and in a thread of 1.3k pages it is likely to have many of them at the same time.
Starship prototype 150m hop - Page 1
Forum section: electronics / general

author: wraper
author_rank: Unknown
timestamp: August 05, 2020, 12:11:54 pm
content: This flying "grain silo" which is 9 meters in diameter and about as high as a 15 story building was launched about half of a day ago. It was not flying straight because it's single engine is mounted off center (mounting intended for 3 engines).

author: Gyro
author_rank: Super Contributor
timestamp: August 05, 2020, 06:09:08 pm
content: Impressive. Wide enough aspect ratio not to need legs! A nasty looking fire around the engine from about 35s in the first video.

author: wraper
author_rank: Unknown
timestamp: August 05, 2020, 06:19:05 pm
content: Quote from: Gyro on August 05, 2020, 06:09:08 pmThere are six legs which you can see deployed. It's just they are as wide as rocket itself.

author: Gyro
author_rank: Super Contributor
timestamp: August 05, 2020, 06:36:12 pm
content: Ha yes, I didn't notice them deploy - I was too busy watching the engine. I'd been thinking they looked more like scaffolding feet.

author: voltsandjolts
author_rank: Unknown
timestamp: August 05, 2020, 07:19:29 pm
content: This would make moving house so much easier.

author: Domagoj T
author_rank: Frequent Contributor
timestamp: August 05, 2020, 07:49:05 pm
content: I think your neighbors might complain about the noise. And broken windows. And the roof being blown away.On the other hand, the fire would probably shut them up.Anyway, that thing is absolutely huge. I can't wait until they launch the entire Super Heavy. If they can pull it off, they're going to disrupt the entire space launch market.

author: Mr. Scram
author_rank: Super Contributor
timestamp: August 05, 2020, 10:09:54 pm
content: This looks like when you accidentally launch prematurely in SimpleRockets and decide to see how your half rocket will fly for giggles.

author: duckduck
author_rank: Frequent Contributor
timestamp: August 06, 2020, 09:32:41 pm
content: Quote from: chris_leyson on August 06, 2020, 03:48:14 amHere's an interesting article on the Raptor engine and what makes it special:https://everydayastronaut.com/raptor-engine/EDIT:Quote from: Mr. Scram on August 05, 2020, 10:09:54 pmThat's OK. It happens to a lot of guys.

author: Red Squirrel
author_rank: Super Contributor
timestamp: August 06, 2020, 11:52:39 pm
content: It's crazy to see that thing fly. Should paint it and build it out to be same aspect ratio as a Panasonic 18650. Have that come down and land near the crowd on Battery Day and Elon Musk pops out of a hatch. That would be one hell of an entrance.