hybridfree/eevblog-posts huggingface dataset:
How many corrections can you get to? - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: April 05, 2023, 02:39:14 pm
content: I gave up around 30.https://youtu.be/tAuPfgZgXec

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 05, 2023, 08:28:01 pm
content: Uh, if one has 20 min to waste.Just quickly fast-forwarded.Is he suggesting to connect a Li-ion battery directly in parallel with a lead-acid battery?

author: bdunham7
author_rank: Super Contributor
timestamp: April 05, 2023, 08:30:19 pm
content: Quote from: SiliconWizard on April 05, 2023, 08:28:01 pmNot Li-Ion, but LiFePO4.

author: paulca
author_rank: Super Contributor
timestamp: April 05, 2023, 09:12:35 pm
content: Yes. He even sells a product to help with that.He thinks that 14.00 volts is fully charged LA. He thinks that fully charged LFP is also 14.00V. He hand waves the cells count and everything else. Deals with commercial bricks.Fine.He also thinks that 13.2V is LA float voltage and that 13.2V is also "resting" voltage for an LFP.It's not just him! YouTube now recommends these people to me.I see three not quite fatal flaws.1. Their measuring is diabolical.2. They don't seem to understand Ohm's law.3. They only measure voltages in one place, however, in other tests they quote different "theoretical" voltage figures for cells in parallel. They never show them measuring those "SoC voltage indicators" on each battery, but they swear they exist... without any understanding of why or what they are actually seeing.I dont think they get it.... at all.LA in parallel with an LFP. Is a lead balloon. It will go only one way.

author: tooki
author_rank: Super Contributor
timestamp: April 07, 2023, 03:01:20 pm
content: I find it hard to take someone seriously who named his boat “Temptress”. 🤣

author: paulca
author_rank: Super Contributor
timestamp: April 07, 2023, 04:42:32 pm
content: I've been arguing back and forth with them.They (they have friends) seem to follow a completely different set of voltages for batteries then the rest of the world, including the manufacturers.Has anyone seen a LFP ~12V battery which states 13.48V as fully charged? Has anyone seen one that states 14.0V?He also quotes this video as evidence of what really happens.Again. How many screw ups can you count in the first few minutes and in his setup?I actually think they are in the belief that because there isn't a massive amount of current, no sparks and no flames that "It must be fine right? Problem solved."They don't seem to understand that constantly pulling the LFP down defeats the entire purpose of it being Lithuim.I could do my own tests, but I'm going to figure an LFP in parallel with a LA will perform negligible better than 2 lead acids in parallel.
Anatomy of a power board - Page 1
Forum section: electronics / general

author: Brumby
author_rank: Unknown
timestamp: April 07, 2023, 01:44:53 am
content: Inspired fromthis thread, I went out an purchased a couple of these power boards. This format makes tidying up the typical desktop computer mains power setup much easier and at the price, it was an easy decision.There was some comment about the fact that in the description, it said "individually switched", but the photo indicated otherwise. The description also said "4 outlet". Both of these were wrong and the photo shows the correct item - with 4 outlets and no switching.However, my curiosity led me to look further, so in the spirit of "Don't turn it on, take it apart"...This is pretty typical construction and I must say, the housing is pretty nice (IMO) having a reasonably low profile with soft rounded edges and quite sturdy to the feel. The only thing it doesn't have is keyhole slots for mounting - but for my needs, there are places I can strap cable ties across it.... and a thought on individual switching. These aren't the best switches for the job, but they were ones I had on hand that were about the right size, to show placement...Not ideal, but there is an argument that you can have access to the switching from one end
Anyone know how much can I get for this at a scrap yard? - Page 1
Forum section: electronics / general

author: nomar123
author_rank: Contributor
timestamp: April 04, 2023, 02:00:21 pm
content: I am hopefully closing on a house soon that has a wood stove chimney on it that is completely unused. The inlet on the wall of the house has been bricked over but the chimney is still there. I think its ~30ft tall and I think its either 10 or 12 inches in diameter.Anyone know how much I could get for this at a scrap yard? I personally think its an eye sore and it serves no purpose so it would be awesome if I could get a few bucks for it and put it into some other projects around the house.

author: DenzilPenberthy
author_rank: Frequent Contributor
timestamp: April 04, 2023, 02:04:55 pm
content: You would be better to sell the flue sections as second hand. They are very expensive.Other than that, call your local scrapyard and ask them what they are paying this week for stainless steel.

author: AndyBeez
author_rank: Frequent Contributor
timestamp: April 04, 2023, 02:11:22 pm
content: Scrap? $zero dollars.Put it on CraigsList or GumTree. Price at 1/3 the cost of a new flue to incentivize buyers. If you want rid, settle for 1/4 offers. But the buyer hauls.

author: Gregg
author_rank: Super Contributor
timestamp: April 04, 2023, 08:55:55 pm
content: I second the craigslist option. Take it down carefully and take good pictures and post it with good descriptions. Don't let a potential buyer take it down and make a mess of your house unless they are a bonded and insured contractor and then make sure in writing that they are liable for any damages.That stainless steel insulated flue pipe is stupid expensive new.

author: jpanhalt
author_rank: Super Contributor
timestamp: April 04, 2023, 10:41:51 pm
content: Scrap steel $22/ton (USA average):https://iscrapapp.com/prices/Stainless may be more.Is it worth the drive? Selling it for "never used" (Craigslist?) will be a lot more bother but potentially get you more.

author: Gregg
author_rank: Super Contributor
timestamp: April 05, 2023, 03:26:07 am
content: Check to see if there are any Habitat for Humanities Re-Stores in your area. They are a non profit that takes donations of usable building materials and resells them, the profits are used for building low income houses. It is possible that you could get a tax write off that is far greater than the scrap value and you'd be helping a good cause.
Reactance (impedance) quick reference chart - Page 1
Forum section: electronics / general

author: Someone
author_rank: Super Contributor
timestamp: April 12, 2023, 04:56:55 am
content: There have been various versions of these plots floating around even before the internet. Pretty self explanatory and convenient as a wall chart.Download the pdf vector format below, it is not only vastly better quality but also a smaller file size.

author: AndersJ
author_rank: Frequent Contributor
timestamp: April 12, 2023, 05:14:17 am
content: Quote from: Someone on April 12, 2023, 04:56:55 am

author: jonpaul
author_rank: Super Contributor
timestamp: April 13, 2023, 02:19:03 am
content: the reactance charts are very limited.My 1960 Tektronix Circuit Computer slide rule is much more intuitive and versatile.The Tek rep gave me two over the years, beaten up but still in use.Jon

author: Tom45
author_rank: Frequent Contributor
timestamp: April 13, 2023, 03:33:34 am
content: Quote from: Someone on April 12, 2023, 04:56:55 amReactance charts had been around a long time when this was published.From Proceedings of the IRE ( Volume: 38, Issue: 12, December 1950):Abstract:The time-honored chart of reactance, frequency, inductance, and capacitance is extended in range, with added scales of susceptance, wavelength, and time constant. Simple geometric patterns are given which enable the chart to be used for the direct solution of various problems such as the bandwidth of a resonant circuit, some properties of a transmission line (wave impedance and delay), and half sections of the usual kinds of constant-k filters (low-pass, high-pass, band-pass).I remember buying K&E Reactance graph paper at the university book store in the 1960s. I'm pretty sure I still have a few sheets. They are probably stored with my supply of carbon paper.
York PRE/Power amp - Page 1
Forum section: electronics / general

author: tiggerlator
author_rank: Contributor
timestamp: April 04, 2023, 06:47:48 pm
content: Anyone ever come across YORK before? I just got this nice little YORK pre/power combo. Says made in japan on the backs, had a quick look inside them, all japanese components, ALPS twisties, Oscar caps. The power amp has some sort of all in one for output power, all discrete components otherwise. Same for the pre amp, all discrete, nice japanese ALPS twisties. The power amp is heavy, has a big flat transformer in it, lots of fuses too.Power amp inside
What is this component of Analog Discovery? - Page 1
Forum section: electronics / general

author: egonotto
author_rank: Super Contributor
timestamp: April 01, 2023, 03:36:47 am
content: Hello,in video #692 by Dave in minute 6:20 you can see a component that aroused my curiosity. What is this component? Maybe a quartz?Best regardsegonotto

author: WattsThat
author_rank: Frequent Contributor
timestamp: April 01, 2023, 04:02:35 am
content: Surface mount LED.

author: egonotto
author_rank: Super Contributor
timestamp: April 01, 2023, 04:33:01 am
content: Quote from: WattsThat on April 01, 2023, 04:02:35 amHello,thanks and it is red.Best regardsegonotto

author: egonotto
author_rank: Super Contributor
timestamp: April 02, 2023, 01:40:35 am
content: Hello,next question. Near the USB socket are 2 red components. Are they perhaps electrolytic capacitors?Best regardsegonotto

author: james_s
author_rank: Super Contributor
timestamp: April 02, 2023, 02:39:31 am
content: They look like blobs of glue to me.
Electronics product design book - Page 1
Forum section: electronics / general

author: VEGETA
author_rank: Super Contributor
timestamp: April 02, 2023, 06:22:17 am
content: Hello,I've been wondering if there is a good specific electronics product design book. I searched amazon for example and found this one to be the closest:https://www.amazon.com/Electronic-Product-Design-Wind-Kaduskar/dp/8126533161/but this does not seem famous or known, can't find a pdf for it too.so do you have good suggestions?

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 02, 2023, 06:18:41 pm
content: Product Design for Manufacture and Assembly; Geoffrey Boothroyd, Peter Dewhurst, Winston Knight; Marcel Dekker; 2002; ISBN 0-8247-0584-XHandbook of materials and product design; Charles A. Harper, editor in chief; McGraw-Hill; 2001; ISBN 0-07-135406-9Designing Electronic Product Enclosures; Tony Serksnis; Springer; 2019; e-ISBN 978-3-319-69395-8On the other hand, the book you mentioned is probably not well known just because it is published by the India branch of Wiley.

author: VEGETA
author_rank: Super Contributor
timestamp: April 03, 2023, 06:53:13 am
content: first book you mentioned seemed the closest but it is more of a general big book rather than specified for electronics or consumer electronics. I really like the book I mentioned in terms of subjects it takes, but looks like the only option is to get it from Amazon. there is alsothis onebut looks like it is just about beginner pcb stuff.maybe one day when I get more experience and success I could write a book about this subject ^_^. Now, it seems that my original suggestion is gonna be my next buy for myself.
Automated Storage Systems - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: April 02, 2023, 05:28:32 am
content: automated storage system suggestionsa video from Japan about the automated storage of bicycles & EV's.the electric vehicles in storage as shown in the video are also at individual charging stations.Why did I post this, do you like me have storage space problems.I need one at a time access to one of as many as 50 plastic storage containers.but it is slow stacking and unstacking a room sized rubik's cube looking for that particular item.I have long considered if automated storage can work at home. if its even possible?if you are interested in automated storage? have you made your own?maybe found a way to fit 4 cars in a 2 car garage or fit 4 bicycles in an apartment.a DIY warehouse in a room. a DIY sliding filing cabinet system.maybe an automated storage system for the lab. using for example plastic storage containers.or maybe automated on-the-bench carousel for 200 types of resistors. controlled by arduino.if you have automated your storage or have suggestions on how to do so please have your say.keep it simple if you can.

author: EEEnthusiast
author_rank: Frequent Contributor
timestamp: April 02, 2023, 05:42:49 am
content: Imagine being stuck in your car and it gets parked automatically. You may have a tough time trying to get out of that building with those heavy robotic lift moving up and down.

author: mendip_discovery
author_rank: Super Contributor
timestamp: April 02, 2023, 06:59:31 am
content: I have seen a few people using a kardex system. Though it would take up two floors in a house. I have it on my list for when I am rich and can afford such luxuries.https://www.kardex.com/
Rockwell automation decades long legal Problems with the Turbo Encabulator - Page 1
Forum section: electronics / general

author: Bud
author_rank: Super Contributor
timestamp: April 01, 2023, 06:05:55 pm
content: 42

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 01, 2023, 06:26:34 pm
content: I always thought that infringement of the Sears/Roebuck girdle-spring patent would have been the bigger issue.
What is going on with digikey and shipping? - Page 1
Forum section: electronics / general

author: Gibson486
author_rank: Frequent Contributor
timestamp: March 31, 2023, 01:08:30 pm
content: For the past 2 orders, I needed an overnight shipment. On each, they split the order into two shipments and delayed the 2nd one. I hope this is not a recurring thing. Atleast they did not double charge for shipping. I thought maybe they split the warehouse into different component types. Nope, it is pretty random as which parts ended up on each shipment.

author: thm_w
author_rank: Super Contributor
timestamp: March 31, 2023, 08:45:26 pm
content: No issues here, but just ordering <5 parts not big orders.You didn't have a custom part in the second shipment or a digireel or something?
Biden invokes Defense Production Act for printed circuit board production - Page 1
Forum section: electronics / general

author: HwAoRrDk
author_rank: Super Contributor
timestamp: March 29, 2023, 07:13:12 am
content: https://www.reuters.com/world/us/biden-invokes-defense-production-act-printed-circuit-board-production-2023-03-27/So, basically, the US government realised "too much of the electronic products produced by our defence industry is reliant on Chinese-manufactured PCBs" and decided to throw some money at North-American industry?However, $50M seems kind of a paltry amount, does it not? That's probably not going to pay for lots of new PCB fabrication factories, and almost certainly won't have any impact on the availability of reasonably-priced domestic production for SME businesses producing electronic products.

author: Gibson486
author_rank: Frequent Contributor
timestamp: March 31, 2023, 01:24:03 pm
content: Throwing 50M at the issue is not gonna lower the labor costs. That is pretty much how chinese factories get things done so cheap. Lots of us in the US kind of see the price and don't ask how because we as sure hell do not want to know, but we do know why! I think he wants things to be more automated, and at the point, 50M is not close to enough.

author: Bud
author_rank: Super Contributor
timestamp: March 31, 2023, 02:02:41 pm
content: Duplicate topic. One Biden is enough.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 31, 2023, 02:10:30 pm
content: I suspect it more likely is earmarked for a precarious congressman's district.
How big mAH laptop powerbank should I buy if I need to charge my laptop twice? - Page 1
Forum section: electronics / general

author: shivajikobardan
author_rank: Contributor
timestamp: March 30, 2023, 12:58:14 pm
content: I'm wondering how much big of a powerbank should I buy if I want to charge my laptop twice to 100%?My laptop:Dell inspiron 15 5567Please help me do the math.I'm from Nepal and these are the powerbanks available in Nepal. (No good quality products available as purchasing capacity is low).https://www.daraz.com.np/catalog/?q=laptop+powerbank&_keyori=ss&from=input&spm=a2a0e.11779170.search.go.287d2d2beprFOy

author: tom66
author_rank: Super Contributor
timestamp: March 30, 2023, 02:18:05 pm
content: Your laptop battery is 42Wh, going by Google search.Powerbanks are almost universally specified with Ah at 3.7V, so equivalently your laptop is the same as a 11350mAh @ 3.7V powerbank. To charge it twice, you'd need at least 22700mAh, plus around 10% to account for the loss during the charging process. So around 25000mAh is required.Your laptop also needs to support USB-C charging.The other thing to check is whether the capacity is genuine - a lot of powerbanks like about the capacity. And there are a lot of fakes around. Are you able to return it if it is lying about capacity? The going rate for Li-Ion cell is at least $150/kWh, the 25Ah pack will be 92Wh, so it is very unlikely a genuine powerbank will cost less than $20 USD equivalent.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 30, 2023, 08:49:35 pm
content: Quote from: tom66 on March 30, 2023, 02:18:05 pmYep. Many of the "cheap" (read: under $100) power banks rated above 15Ah are scams. There are numerous tests around showing that a typical sub-$100 battery rated 30Ah is actually just barely over 10Ah.Physics can't lie. 100Wh of Li-ion batteries will take significant weight and volume. Just have a look at the typical energy density for Li-ion and do the maths.$20? Almost anything sold under $100 for > 20Ah is likely to be a lie in practice.

author: tom66
author_rank: Super Contributor
timestamp: March 30, 2023, 10:15:27 pm
content: Quote from: SiliconWizard on March 30, 2023, 08:49:35 pmYes, a fair point: cell price is one thing, but the integration is costly too. I found that a search for trustworthy 20Ah or 30Ah powerbanks returns a price around 2-3x what I quoted, which allows for the casing, power board, cell integration, retail costs and manufacturer profit.

author: shapirus
author_rank: Super Contributor
timestamp: March 30, 2023, 10:23:42 pm
content: Quote from: tom66 on March 30, 2023, 02:18:05 pmI'd say at least double the 10%, because the dc/dc conversion, most likely, happens in both the powerbank and the laptop.Then there are losses in the wires and in the cells.So I'd probably account for about 30% total losses.
Alibaba to split into 6 companies, pursue IPOs in major shakeup - Page 1
Forum section: electronics / general

author: DC1MC
author_rank: Super Contributor
timestamp: March 28, 2023, 02:23:52 pm
content: https://asia.nikkei.com/Business/Technology/Alibaba-to-split-into-6-companies-pursue-IPOs-in-major-shakeupWhat will happen with Aliexpress ?!?!

author: Black Phoenix
author_rank: Super Contributor
timestamp: March 28, 2023, 04:34:00 pm
content: Quote from: DC1MC on March 28, 2023, 02:23:52 pmFor the ones that can't read the story -https://archive.is/2bxUCRegarding your question, absolutely nothing. It will be incorporated into the Taobao Tmall Commerce Group or (more probably) in the Global Digital Commerce Group.EDIT - at the end of the article:Quote

author: thm_w
author_rank: Super Contributor
timestamp: March 28, 2023, 09:36:47 pm
content: "The six new groups will be: Cloud Intelligence Group, Taobao Tmall Commerce Group, Local Service Group, Cainiao Smart Logistics, Global Digital Commerce Group and Digital Media and Entertainment Group."I guess the selfish concern here is if Cainiao is its own company, expect shipping speeds and possibly lost items to increase.

author: Black Phoenix
author_rank: Super Contributor
timestamp: March 29, 2023, 03:55:20 am
content: Quote from: thm_w on March 28, 2023, 09:36:47 pmWell I don't have a bad experience per se with them. Also with SF. The same can't be said about Deppon Express, UL Express or even the heavy market share Yunda Express.
Why high Vceo transistors for Vbe multipliers in class AB PAs? - Page 1
Forum section: electronics / general

author: Sacodepatatas
author_rank: Regular Contributor
timestamp: April 01, 2023, 12:30:50 am
content: I thought that they would use the same type of transistors than any of the the input BJT in a Darlington/Sziklai pair at the output stage, because if they are thermally linked by sharing the heatsink, then the thermal curves would match (because they are of the same type or either complementary) and there would be some Iq bias balance.But i've seen some designs that use a 2SD669A as Vbe multiplier but the driver BJTs in the darlington pairs were other references such as the pair 2SB1369/2SD2061. In such a case, the 669 is not thermally linked to any other. Because the Vce can't go over a few volts due the negative feedback, why this transistor can't be replaced with, for example, a 2SD882? Is there another factor in play that i'm missing?

author: David Hess
author_rank: Super Contributor
timestamp: April 01, 2023, 10:55:55 am
content: Since the 2SD669A is a high voltage transistor, wouldn't it match the output transistors better than the low voltage 2SD882?I do not know why they would not use the same transistor as one of the driver transistors though.
frequency of an attractor of a dynamical system - Page 1
Forum section: electronics / general

author: metebalci
author_rank: Frequent Contributor
timestamp: March 28, 2023, 01:16:53 pm
content: Not totally related to electronics but I have a question. At least at the entry level, the analysis of (non-linear) dynamical systems are concerned with stability and bifurcations etc. but for example does not say something regarding the behavior in time e.g. the frequency of oscillations. Basically, lets say there is a limit cycle or an attractor that is causing some type of oscillatory behavior, what are the search terms that I should look for that is working on such analysis ? I tried but it always ended with stability or bifurcation analysis.

author: RAPo
author_rank: Super Contributor
timestamp: March 28, 2023, 02:03:55 pm
content: Look for "Frequency characteristics of a dynamical system". Basically, you have a function that transfers the time domain to the frequency domain. Think FFT etcAnother thing to look for is " reconstruction of the phase space using a frequency domain.
Why do quotes screw up when modifying posts and how do I make it stop? - Page 1
Forum section: electronics / general

author: MarkS
author_rank: Unknown
timestamp: March 27, 2023, 03:31:18 pm
content: As the title says. I've tried the "Toggle View" button, and that turn the HTML back into BBCode, but the quotes are changed in the process. How do I fix/stop this?

author: Someone
author_rank: Super Contributor
timestamp: March 27, 2023, 09:08:45 pm
content: Default to the bbcode editor (setting in your profile "Look and Layout"). Swapping between the two with text present is destructive/non-reversed.or... swap before you add the quote(s) and then use the Insert Quote button on the posts below the editor.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 27, 2023, 09:33:17 pm
content: On every forum I've ever used I avoid the quote function anyway. Because when someone later tries to read through your thread at a future time because it sounds relevant to their future problem, then they find the whole thing broken up by blocks of repeated quotes, and the whole page far longer to scroll through than needed. Especially bad are cases where someone quotes someone who is already quoting another post...I tend to prefer noting in my reply post the username or post number of a post I'm replying to, or if I need to quote something just copying and pasting the single phrase or sentence of the original text and showing it "just in normal quote marks".

author: thm_w
author_rank: Super Contributor
timestamp: March 27, 2023, 09:37:08 pm
content: Quote from: Infraviolet on March 27, 2023, 09:33:17 pmSounds like more hassle than its worth, use the quote button and remove excess text/photos if you think its too long.

author: MarkS
author_rank: Unknown
timestamp: March 28, 2023, 01:43:20 am
content: Quote from: thm_w on March 27, 2023, 09:37:08 pmExactly. If it's a long post and I'm replying to the entirety of it, I'll replace the text with "...snip...". That way, It's clear as to which reply I'm replying to, but not overwhelmed with text.

author: EPAIII
author_rank: Super Contributor
timestamp: March 28, 2023, 07:07:12 am
content: Yes, I like using the "...<snip>..." to remove text that is not relevant to my post. I wish there was a button to insert that.

author: tautech
author_rank: Super Contributor
timestamp: March 28, 2023, 07:46:07 am
content: Quote from: MarkS on March 27, 2023, 03:31:18 pmSimple, most of us have done this at some time.In your profile you have the WYSIWYG editor set to ON, turn it to OFF.
[NEW]: “The secret life of components”: Series 3 - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: March 29, 2023, 06:27:14 pm
content: Tim Hunkin’s fantastic “The secret life of components” begins a new, third series tomorrow, March the 30th 2023:

author: Infraviolet
author_rank: Super Contributor
timestamp: March 29, 2023, 07:34:12 pm
content: Look forward to it, enjoyed his first two series'.
Selecting a suitable Schottky / Blocking Diode...  - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: March 27, 2023, 08:02:20 am
content: When using a Schottky diode "ONLY" in reverse bias, is voltage the only rating that's important?

author: PartialDischarge
author_rank: Super Contributor
timestamp: March 27, 2023, 08:59:25 am
content: No, the problem with schotkkys is their high leakage current and increasing with temperature, so I'd say they are the worst diode to choose for just "blocking"

author: Peabody
author_rank: Super Contributor
timestamp: March 27, 2023, 02:16:52 pm
content: Could you explain what "only in reverse bias" means, or post a drawing?

author: AVGresponding
author_rank: Super Contributor
timestamp: March 27, 2023, 05:53:52 pm
content: Quote from: Peabody on March 27, 2023, 02:16:52 pmMaybe as a snubber on a relay coil?
Amprius battery claims 500Wh/kg battery - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: March 24, 2023, 10:00:48 pm
content: I am absolutely not qualified to judge whether it's fishy or not, but:https://amprius.com/products/They claim a significant improvement over existing technologies. If it's true, great

author: Siwastaja
author_rank: Super Contributor
timestamp: March 26, 2023, 10:43:20 am
content: Having 30-40% improvement in aerospace application (with no limits for cost) over low-cost commercial products seems totally plausible.Also see this:Specific energy 360-500Wh/kgCycle life 200-1200 cyclesMaybe this is their compromise; I'm doubtful you'd get the combination of 500Wh/kg and 1200 cycle life in one product.By sacrificing the 1000-cycle life into 200 cycles, you'd probably get 10-15% extra capacity (thus energy density) out of that alone.And that 360Wh/kg is not far from what others are already doing.Now is it possible to transform a high-cost niche technology into mass-market low cost tech? Probably yes, but is it easy? We will see.
DFM Now! Installer “DFMNow-V8.zip/exe” - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: March 24, 2023, 11:31:15 pm
content: Hey AllA bit of a long shot, but would anyone have the installer forDFM Now!, which should be called either “DFMNow-V8.zip” or “DFMNow-V8.exe”, and would have originally livedhere. If not, do you mind sharing the installed files typically living in “C:\Numerical Innovations\DFM Now V8”? You could upload either to something likefile.ioReason for asking is that DFM Now! has been discontinued (as in completely purged from the internet), with the last version being eitherv8.3.53 or v8.4
Old T&M Gear - ever wondered how they get those component bends? - Page 1
Forum section: electronics / general

author: Tony_G
author_rank: Super Contributor
timestamp: March 25, 2023, 03:07:08 am
content: Hey All,I just stumbled across this video that shows what a typical manufacturing experience would have been for that old test gear - I have many pieces of gear that have these "perfect" bends in transistor etc, if you've worked on that old gear you would have seen it as well.I thought it was worth sharing:I would be remiss if I didn't take the opportunity to point out that the title is also an accurate summation of my entire career...TonyG

author: coppercone2
author_rank: Super Contributor
timestamp: March 25, 2023, 03:35:57 am
content: if you don't have them, get wire bending pliers. They make doing a nice job so much easier.For real precision get a box of drill blanks so you can wrap any size loopI have been meaning to buy a very fine tip marker so I can mark bend areas on leads too
We need Casio power for the carbon fight. - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: March 24, 2023, 08:18:30 pm
content: I bought this when I was about 15, maybe 18, tops 20. I'm 48.I found it today after another year being lost and... works perfectly.It's not uncommon to find Casio watches over a decade old still showing time.Its the same battery, this one is screw opened and never has been.

author: paulca
author_rank: Super Contributor
timestamp: March 24, 2023, 08:21:14 pm
content: How come my Extech meter wets itself ever 2 years? Duracells. Thankfully the only causality, which I find poetic was the buzzer.

author: paulca
author_rank: Super Contributor
timestamp: March 24, 2023, 08:27:35 pm
content: Comparing this to the modern world.Casio could go out of business because nobody buys their products anymore, only because, they already did. They bought a Casio 20 years ago, it still works. Why would they need another one?That's a bit sad.

author: tom66
author_rank: Super Contributor
timestamp: March 24, 2023, 09:15:30 pm
content: A lot of this is low power CMOS... That calculator ASIC probably pulls <10uA running, and <0.1uA in sleep mode.0.1uA over a 230mAh CR2032 coin cell is 2.3 million hours or 262 years.Realistically the cell chemically fails before then, which is why I always find the Microchip XLP (and the like) products funny, 10nA sleep current is great, but realistically will you need it?

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 24, 2023, 10:34:35 pm
content: Are we just now discovering how wasteful our use of technology has been for like the past 30 years?Now sure you can't compare a simple calculator that is just a calculator, has basic LCD with no backlight and no colors, with something that now has the power of a small computer and screens with better resolution than your typical workstation of early 2000's.But do we need that as a calculator? In most cases, not.But that's the same global trend for everything, especially in computing. We could have modern computers with 1/10 of the consumption and 1/10 of the RAM, storage space, etc and still pretty much have the same functionality for basic uses like browsing, email, writing documents, etc. Without even loss of functionality or ease of use. We all know that we've been wasting computing resources.And yes, a very-low-power device with basic components, basic functionality and decent build quality will outlive any modern device. Complexity and cost reduction in production does not help.So while a 40-year old calculator is likely to still work fine today, good luck with a recent device in 40 years. That's probably going to be a different story.But we still make these low-power and simple devices. Maybe not with the same quality though. You can find a recent basic calculator which will pretty much draw as little power as this Casio.Same for watches. There are still regular watches that can run years on the same coin cell. Not going to happen with a "smart watch" which is a tablet in disguise.
Only (potentially) funny if you've ever used vi - Page 1
Forum section: electronics / general

author: pdenisowski
author_rank: Super Contributor
timestamp: March 27, 2023, 08:32:15 am
content: I used Unix almost exclusively throughout grad school and at my first 3 R&D jobs, and my editor of choice was vi.Spent a good amount of time this weekend working with a Raspberry Pi and decided to relive the good old days by doing everything with vi. Ah, the joys of mouse-less text editingBack working in Windows / Office this morning, went to spell check, and found ":w" throughout my document.

author: DimitriP
author_rank: Super Contributor
timestamp: March 27, 2023, 09:10:59 am
content: QuoteSo immediattely you didn't type :s/\:w//g did 'ya ?

author: shapirus
author_rank: Super Contributor
timestamp: March 27, 2023, 09:13:48 am
content: E492: Not an editor command: Wq

author: pdenisowski
author_rank: Super Contributor
timestamp: March 27, 2023, 09:15:59 am
content: Quote from: DimitriP on March 27, 2023, 09:10:59 am

author: Infraviolet
author_rank: Super Contributor
timestamp: March 27, 2023, 09:38:39 pm
content: Having a case of this almost?https://xkcd.com/477/
Arm seeks to raise prices ahead of hotly anticipated IPO - Page 1
Forum section: electronics / general

author: Karel
author_rank: Super Contributor
timestamp: March 23, 2023, 12:41:25 pm
content: SoftBank-owned group aims to charge more for each chip design in radical shake-up of business model“Arm is going to customers and saying ‘We would like to get paid more money for broadly the same thing’,”said one former senior employee who left the company last year.“What SoftBank is doing at the moment is testing the market value of the monopoly that Arm has.”https://www.ft.com/content/25ea2570-264d-472d-8ef8-3a02003e87ab

author: tom66
author_rank: Super Contributor
timestamp: March 23, 2023, 12:50:49 pm
content: If I were an Arm droid, I would be terrified about RISC-V. Especially given China is pushing it hard. I am not sure how the performance/power stuff compares but an open ISA and architecture could eliminate much of the advantages Arm has.

author: thm_w
author_rank: Super Contributor
timestamp: March 23, 2023, 09:39:08 pm
content: "These people said Arm planned to stop charging chipmakers royalties for using its designs based on a chip's value and instead charge device makers based on the value of the device. This should mean the company earns several times more for each design it sells, as the average smartphone is vastly more expensive than a chip."This is dumb. But it might temporarily increase the value of the IPO.Remind me when they go public and make some money shorting ARM.
It's kind of a close loop? - Page 1
Forum section: electronics / general

author: Bill
author_rank: Contributor
timestamp: March 25, 2023, 12:43:13 pm
content: Hello everyone, does anyone among us know of this kind of control loop, I read the report but it does not describe this loop in a global and simple way, if anyone knows this kind of control system, I would like to have his analysis.The link:https://www.google.com/url?sa=t&rct...709/document&usg=AOvVaw0N702XOZ2bR07FxEcIQxgN
VNA calibration / crystal measurements question - Page 1
Forum section: electronics / general

author: antenna
author_rank: Frequent Contributor
timestamp: March 20, 2023, 11:17:47 pm
content: I have seen in videos where people will calibrate to a certain frequency range, but then to get a closer look, they change to a narrower span without recalibrating. So lets say I calibrate my VNA for 28MHz to 29MHz to look at a variety of 10m crystals. If I want to look at the S21 at 0° phase for Rs calculations or the 45° phase shift frequencies for measuring Lm and Cm, do I need to recalibrate every time I zoom in to a 10kHz span and look at a crystal within this 1MHz range, or will the results still be close enough if I leave the calibration for the 1MHz span loaded?Thanks!

author: Kim Christensen
author_rank: Super Contributor
timestamp: March 21, 2023, 12:29:16 am
content: Depends on the VNA, but on some you can enable interpolation in the calibration menu. Then you won't be constantly prompted to re-CAL every time you change parameters within the range. Interpolation will add some error, but it's usually not an issue for most purposes.

author: antenna
author_rank: Frequent Contributor
timestamp: March 21, 2023, 01:19:17 am
content: I have a Siglent SVA1032x with latest update and a nanoVNA-F HW2.2. I don't recal interpolation being an option on either, but I wasn't sure if they did it automatically or not

author: Kim Christensen
author_rank: Super Contributor
timestamp: March 21, 2023, 02:56:58 am
content: I'm not familiar with those models. With the HP VNAs I've used, if you don't have interpolation enabled, it will display uncal on the screen and disable the calibration factors if you change span after having calibrated it with a mechanical standard.Is there any warning message on the screen when you do that? ie: Does it continue to indicate it's calibrated when shrinking the span for example?

author: antenna
author_rank: Frequent Contributor
timestamp: March 21, 2023, 07:29:56 am
content: The Cal indicator does disappear, but no warnings appear. I did try a narrower calibration to see how it compared to a wider one that had its span made smaller without recalibration, and the results were surprisingly close. I do not know that I can trust it in every situation though.
How to hand solder anno 1944 - Page 1
Forum section: electronics / general

author: pcprogrammer
author_rank: Super Contributor
timestamp: March 19, 2023, 03:57:10 pm
content: This one popped up on youtube.Gives a nice recap of how things where done back then.

author: shapirus
author_rank: Super Contributor
timestamp: March 19, 2023, 05:52:34 pm
content: It's curious that this video was uploaded almost 6 years ago, yet it seems that youtube started to recommend it only now.I have just watched it for the first time because of this too: it popped up in my recommendations. Coincidence? I don't think sop.s. I want to have one of those big ass irons.

author: jfiresto
author_rank: Frequent Contributor
timestamp: March 19, 2023, 06:39:31 pm
content: Oh good grief, I am not sure I really needed that reminder.I was visiting a friend a few years back and got drafted to solder up a simple cable to finish servicing his car, a cable that had a couple 2.5mm diameter automotive contacts on it. I used one of those irons for the job because that is all he had. The tip was at least five times wider than, well, necessary but somehow I managed.When I asked about a heat gun for the heat shrink, he said he did not have one. So I let him set the shrink with a couple matches.

author: pcprogrammer
author_rank: Super Contributor
timestamp: March 20, 2023, 05:44:40 am
content: Quote from: shapirus on March 19, 2023, 05:52:34 pmI have noticed that recommendations on youtube are closely related to what's going on on the forum, at least the things I look at.Big companies at work, but with ublock_origin I got rid of the pesky adverts, so thanks to members here for advising that one.My dad had a fairly big one, but not as big as the one used for sealing that box. Can't remember where or why it was dumped. Not that I have had the need for it in many years.
Datasheet for part J17 JRC M9138J  - Page 1
Forum section: electronics / general

author: mvkakati
author_rank: Newbie
timestamp: March 18, 2023, 04:09:47 pm
content: Hi,I am looking into an old Liebert PSA 350 UPS (year 2000). I am not able to find the data sheet for the two parts.J17 JRC M9138J (TO 220 F)J17 JRC M9141J (TO 220 F)Could some one point me to the datasheet.Thanks in advance.MVK

author: gamalot
author_rank: Super Contributor
timestamp: March 18, 2023, 04:29:54 pm
content: Where are the pictures? I have every reason to suspect that you are confusing J17 and 317!https://datasheetspdf.com/pdf-file/455064/NewJapanRadio/NJM317/1
ChatGPT - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 16, 2023, 07:56:16 pm
content: Hmm, nothing.

author: magic
author_rank: Super Contributor
timestamp: March 16, 2023, 08:01:59 pm
content: Yeah, I think we need to start deleting every post, thread or user that mentions this word.And bring back the good old tradition of banning for meaningless thread titles

author: floobydust
author_rank: Super Contributor
timestamp: March 16, 2023, 08:09:06 pm
content: Come on, gimme a chance. Bot lives matter!

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 16, 2023, 08:11:54 pm
content: Quote from: floobydust on March 16, 2023, 08:09:06 pmAhaha, you'd think it was a joke. I can smell that coming though from parsecs away.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 16, 2023, 10:31:59 pm
content: Dont worry. AI is feeding on its own crap and will soon dissapear up its own cloaca.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 17, 2023, 01:02:17 am
content: What does ChatGPT say about that?

author: phil from seattle
author_rank: Super Contributor
timestamp: March 17, 2023, 05:47:30 pm
content: Maybe EEVblog should add a flag for State of Denial.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 17, 2023, 08:10:19 pm
content: Kiss my big fat ass!

author: phil from seattle
author_rank: Super Contributor
timestamp: March 17, 2023, 08:53:34 pm
content: Quote from: Terry Bites on March 17, 2023, 08:10:19 pmNothing like a civil discourse.

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 17, 2023, 10:24:19 pm
content: It looks as if someone's had a bad day.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 18, 2023, 10:23:38 am
content: AI is busy hoovering up the main human interests on the web:Were looking a system that learns from cat videos, idle chat and p*rn.AI will conclude that the web is one giant pacifier and make dummies of us all.# Search term Monthly Search Volume Yearly Traffic1 youtube 387.75M 3.16B 3.04B 118.34M youtube.com2 facebook 322.60M 1.7B 1.69B 43.12M facebook.com3 p*rnhub 198.77M 205.26M 205.26M 0 p*rnhub.com4 WW Wittgenstein but we're all too embarrased to say so. (I know I am)Have a nice say.
Turbo F1 engines - How they started, part 1 - design and troubleshooting - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: March 17, 2023, 11:41:00 pm
content: Most F1 doc's are about the racing, this one follows a team of engineers, and electrical engineers, as they prototype a Turbo era 1980's F1 engine.
Super Sick - 56 transition controls for a triple inverted pendulum. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: March 15, 2023, 11:55:41 pm
content: Talk about some serious balanced motion control.I still cant believe they got all 3 pendulum joint to stand vertically in position 7 yet alone make a transition from form all other configurations to and from the total vertical alignment.

author: Hawaka
author_rank: Regular Contributor
timestamp: March 16, 2023, 06:33:32 am
content: It is pretty impressive, but the real question here is: Were the transitions calculated or created by random try?

author: dobsonr741
author_rank: Frequent Contributor
timestamp: March 16, 2023, 07:23:15 am
content: Been asked on the YouTube comments. Calculated + feedback. All 3 joints send position feedback.

author: BrianHG
author_rank: Super Contributor
timestamp: March 16, 2023, 08:01:25 am
content: It does look like they have rotary encoders on at least the first 2 joints.However, I could be wrong. To keep it completely frictionless, they probably need some sort of optical or very low friction contacts prom axis-pivot to the next axis-pivot.Otherwise, if it is all load cell measured at the moving base, this it is too unbelievable. Because of other videos on Youtube, like the impossible miss basketball net, camera feedback is also possible.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 16, 2023, 09:40:48 pm
content: Each of the joints has a bulky blue (perhaps 3d printed plastic) housing behind it. There'd be plenty of room in there for an optical or magnetic encoder, even if only a fairly low res quadrature one.Very impressive work!
Why are 24GHz presence sensors slow to respond? - Page 1
Forum section: electronics / general

author: e100
author_rank: Frequent Contributor
timestamp: March 13, 2023, 09:49:45 am
content: Does anyone know why the newer generation of human presence sensors operating in the 24-60GHz range take several seconds to respond to large changes in the environment?Their slowness of response means that they are only useful when paired with a standard PIR sensor to trigger when someone enters a room.However, once you are in the room they do a great job at detecting the tiniest of movements that the PIR sensor doesn't see.

author: MathWizard
author_rank: Super Contributor
timestamp: March 14, 2023, 05:25:36 am
content: Wow thats fast stuff, so can you would put that in a hallway or doorway as an alarm ? Well I'm suppused to make optical versions or something, but I never heard of such sensors before, and they are cheap, $20CAN.I guess they talk right to a modem/or Bluetooth. When the power goes out I'll have to string up tin cans tho.

author: thm_w
author_rank: Super Contributor
timestamp: March 14, 2023, 09:05:14 pm
content: Several seconds? It looks like its instantaneous.But then you probably average over time to avoid false alerts.9:30 in here:

author: PwrElectronics
author_rank: Regular Contributor
timestamp: March 15, 2023, 04:15:12 pm
content: Late 90s I was involved with a project to make a low cost ground speed radar. We used transceiver modules from MACOM at IIRC 24.125GHz that were originally designed for automatic opening doors on stores/markets.At the time, pre-GPS; there was a market for things like that for agricultural applications. I think there is still a very small market for that sort of product but have not kept up.
Will a Cyclone 3 TQFP-144 pack return a JTAG device ID with no decoupling caps? - Page 1
Forum section: electronics / general

author: MarkMoses
author_rank: Newbie
timestamp: January 04, 2023, 08:53:32 pm
content: Will a Cyclone 3 TQFP-144 pack return a JTAG device ID with no decoupling caps?Trying to test if a part is genuine, if I just put the chip in a clamshell socket, and connect power and gnd over say 10 mil traces to test ponts with no ground plane.Powering off a bench supply.What are the chances I could pull a device ID?Asking for a friend...

author: ataradov
author_rank: Super Contributor
timestamp: January 04, 2023, 09:20:51 pm
content: Very high chance that it will. But you still need to supply the core and PLL voltages and at least the bank with the JTAG pins. So, the setup is not as simple.

author: MarkMoses
author_rank: Newbie
timestamp: March 15, 2023, 03:23:34 pm
content: Well it turns out adding Decoupling caps and fixing some horrific routing of power on the JTAG fixture board "my friend" was making allowed it to come out of POR, and we were able to read a JTAG device ID etc.
Function Modules INC 9040 Operational Amplifier  - Page 1
Forum section: electronics / general

author: kawal
author_rank: Frequent Contributor
timestamp: March 14, 2023, 12:42:45 am
content: Found this in my local surplus store.

author: kawal
author_rank: Frequent Contributor
timestamp: March 14, 2023, 12:46:38 am
content: A few more pictures