hybridfree/eevblog-posts huggingface dataset:
Need Help with Rohde & Schwarz FSP Spectrum Analyzer Issue - Page 1
Forum section: electronics / general

author: anhletrinhnd
author_rank: Newbie
timestamp: March 04, 2025, 02:44:11 am
content: Hello everyone,My Rohde & Schwarz FSP Spectrum Analyzer is showing a "FAILED***" error for the LO-Amplifier during the self-test. However, the attenuation issue only occurs in a specific frequency range. Does anyone have any experience troubleshooting this problem? Any help would be greatly appreciated.Thank you!

author: thm_w
author_rank: Super Contributor
timestamp: March 05, 2025, 01:12:24 am
content: Belongs in repair or test equipment section, you can edit and move it:https://www.eevblog.com/forum/repair/A few posts here:https://electronix.ru/forum/topic/179933-rs-fsp7-lo-amplifier-failed/

author: anhletrinhnd
author_rank: Newbie
timestamp: March 06, 2025, 02:42:57 pm
content: Thank you very much!
Relative and absolute errors problem... [OCTAVE] - Page 1
Forum section: electronics / general

author: DankakaTheCat
author_rank: Newbie
timestamp: February 26, 2025, 06:19:00 am
content: I need to find the absolute errors of n^2 and m^2. And then m^2-n^2 and then finding the relative error of m^2-n^2. I just don't know what to do and I pretty much just gave up...| Here's my code.clcformat longgm = 3.4n = 7.05l = 0.2delta_abs_m = 0.05delta_abs_n = 0.002delta_abs_l = 0.01x = nthroot(m^2 - n^2, 3) / l + 4 * m * ldelta_otn_m = delta_abs_m / abs(m)delta_otn_n = delta_abs_n / abs(n)delta_otn_l = delta_abs_l / abs(l)delta_1 = delta_otn_m*2delta_2 = delta_otn_n*2delta_abs_1 = m^2 * delta_1delta_abs_2 = n^2 * delta_2delta_abs_3 = delta_abs_1 + delta_abs_2delta_3 = (delta_abs_3/abs(m^2-n^2))delta_otn_x = (delta_3 * 1/3) + delta_otn_l + 4 * (delta_otn_m * delta_otn_l)delta_abs_x = delta_otn_x * abs(x)` I want the answer to be like this.delta_otn_x = 0.02755056196018455delta_abs_x = 0.8324383431408473But instead I get thisdelta_otn_x = 0.05615893443960791delta_abs_x = 0.792451039618728
tantalium polarity - Page 1
Forum section: electronics / general

author: bigendian
author_rank: Regular Contributor
timestamp: February 25, 2025, 10:09:27 pm
content: hi,just to be sure, what is the correct polarity ?

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 25, 2025, 10:31:04 pm
content: On tantalum, line is positive.On electrolytic, like is negative.Why? No idea, 'just because'.....

author: bigendian
author_rank: Regular Contributor
timestamp: February 25, 2025, 10:36:26 pm
content: yes, i know, but i ask because this specific type has a kind of minus inside the bar

author: thm_w
author_rank: Super Contributor
timestamp: February 25, 2025, 10:41:15 pm
content: If you google search that part number it brings you to the datasheet:https://www.digikey.com/en/products/detail/vishay-sprague/293D475X9016A2TE3/1559500https://www.vishay.com/docs/40002/293d.pdf"Capacitor marking includes an anode (+) polarity band, capacitance in microfarads and the voltage rating. “A” case capacitors use a letter code for the voltage and EIA capacitance code."

author: Whales
author_rank: Super Contributor
timestamp: February 25, 2025, 10:49:12 pm
content: Quote from: bigendian on February 25, 2025, 10:36:26 pmYeah, that's an awful marking. I can understand you feeling very uncomfortable.I have started changing parts on my boards because of awful manufacturer markings. I will pay a few cents more per part so that I can read it and get it around the right way easily, cost cutting can come later.

author: bigendian
author_rank: Regular Contributor
timestamp: February 26, 2025, 06:23:30 am
content: The constructor datasheet doesn't explain if that only package size, that use a different + mark from all the other, is a +. So i suppose yes. Thanks.It is a mistery also why that only size has a + band with inside a "-". Also, there are some similar caps with a "+" inside the + band. So since this is showing a minus i was supposing it can be the negative.Thanks.

author: thm_w
author_rank: Super Contributor
timestamp: February 26, 2025, 11:19:39 pm
content: Yes its annoying they have not updated their datasheet and its not clear why they added that empty space, but "band" just means marking, and the side the marking is on.
Tamagotchi Software - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: February 24, 2025, 11:34:48 pm
content: just seen a video about Tamagotchi by LGR . them handheld digital pets that was so popular back in 1997Question is can Tamagotchi make a come back? by coding new pet game software on today's micro's on today's tiny OLED color screens.the handheld hardware side of things has never been easier to assemble. with today's 3D printing & custom pcb design.just the opportunity for DIY software coders. so as always I had to post a comment.

author: kjr18
author_rank: Regular Contributor
timestamp: February 25, 2025, 11:18:05 am
content: There are already some in the wild, for examplehere, orhere. But these are based on original ROM's, so not really new Tamagochi, but not that really hard to make a new one.

author: Whales
author_rank: Super Contributor
timestamp: February 25, 2025, 11:44:17 am
content: Extraction & reverse engineering of firmware:

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 25, 2025, 12:29:50 pm
content: With everything on smartphones these days and online gaming being ubiquitous, I'm not sure there's any market for standalone devices like that anymore.But who knows. Maybe the comeback of standalone devices would work.With the processing power we now have with some ultra-low power MCUs (such as STM32U5 and others), much more advanced Tamagotchis could certainly be designed, with nicer displays too.You'll need to conduct your market research.

author: tom66
author_rank: Super Contributor
timestamp: February 25, 2025, 03:25:53 pm
content: Seems that Tamogotchis are still sold. I remember in the 2000s when they were all the rage. Schools had to ban them because kids got distracted in lessons, you had to 'feed' it every 6 hours or it would die!! Some kids got really distraught over losing their virtual pet. It was a weird phenomenon.
Funny AI-generated product description - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: January 22, 2025, 07:20:53 pm
content: Here's RS-Online using AI to free mankind from drudgery and expand human potential beyond all limits. Well, maybe...https://us.rs-online.com/product/marathon-special-products/9616901/70332837/

author: AlbertL
author_rank: Regular Contributor
timestamp: January 22, 2025, 07:26:05 pm
content: Here's another:Quote(fromhttps://us.rs-online.com/power-products/inverter-dc-ac-power-supplies-/)

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 22, 2025, 11:34:33 pm
content: Quote from: AlbertL on January 22, 2025, 07:20:53 pmI have been blocked by RS apparently.

author: AlbertL
author_rank: Regular Contributor
timestamp: January 23, 2025, 12:14:12 pm
content: Here's the relevant text...QuoteAnd a picture of the item:https://www.galco.com/9616901-marathon-special-products.html

author: tom66
author_rank: Super Contributor
timestamp: January 23, 2025, 12:20:08 pm
content: My guess is lazy intern pasting all product descriptions into ChatGPT and getting a description that way.

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 23, 2025, 10:35:40 pm
content: Interns use ChatGPT these days...

author: xrunner
author_rank: Super Contributor
timestamp: January 24, 2025, 02:02:09 am
content: Quote from: SiliconWizard on January 22, 2025, 11:34:33 pmMe too -You have been blocked.Why? Something about the behaviour of the browser has caught our attention.There are various possible explanations for this:You are browsing and clicking at a speed much faster than expected of a human being.Something is preventing JavaScript from working on your computer.There is a robot on the same network (IP 48.32.222.197) as you.Having problems accessing the site?ID: 3011ad8e-6f7c-4af7-c7a7-f88db485b40b

author: Bryn
author_rank: Regular Contributor
timestamp: January 24, 2025, 05:59:30 pm
content: First we have AI slop plaguing Google Images, then this... the death of the Internet is in sight.Also, went on that site just out of curiosity and I got blocked also. Was my first time there as well

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: January 24, 2025, 07:16:43 pm
content: Blocked as well... when i click on the link, but it works when i copy the link and paste it on the adress bar.

author: AlbertL
author_rank: Regular Contributor
timestamp: February 25, 2025, 01:26:38 am
content: Here's more profound AI-generated insight, from Microsoft Copilot in response to a Bing query "machine screw sizes"...
Does anyone has one of the following actum realizer files?  - Page 1
Forum section: electronics / general

author: proxymo
author_rank: Contributor
timestamp: February 23, 2025, 06:05:42 pm
content: Hi,Does anyone has the latest actum realizer installation files?RealizerGold450_Build73.exeRealizerSilver450_Build73.exeRealizerBronze450_Build73.exeThanks
Looking for New Tools and Software for Electronics Integration Engineering - Page 1
Forum section: electronics / general

author: EliOhana101@outlook.com
author_rank: Newbie
timestamp: February 21, 2025, 09:29:58 am
content: Hello everyone,I’m an electronics integration engineer, and my work mainly involves tasks such as designing connector harnesses, calculating voltage drops, and creating block diagrams. I’m currently looking for new tools, software, or even ideas that can help me improve and streamline my work in these areas.Any suggestions, recommendations, or insights on useful tools or resources would be greatly appreciated!Thank you in advance!

author: Halcyon
author_rank: Unknown
timestamp: February 22, 2025, 11:50:02 pm
content: Duplicate post.
Rochester Instruments Systems (RiS) Test Equipment - Page 1
Forum section: electronics / general

author: ZGoode
author_rank: Frequent Contributor
timestamp: February 13, 2025, 11:46:59 pm
content: Having recently acquired an RiS Supercal CL6000, I did a little digging, and was surprised at truly how little information there was on them. I was surprisingly able to find a guy in South Africa who was willing to sell/send me his user and service manual (which I plan on scanning on uploading as soon as I receive it next week). As far as I can find, there are no other known copies of this manual, so I definitely got lucky here.Does anyone have any experience working with equipment from this company or know anything about them? I was able to find a short press brief from 2000 saying they were bought out by Ametek, but they've pretty much scrubbed everything about RiS.

author: Poroit
author_rank: Frequent Contributor
timestamp: February 15, 2025, 04:59:06 am
content: G'day ZGooge,I remember working with Rochester Power Transducers in the late 70's.As you say ..it looks like Ametek gobbled them up like many others they purchased.

author: ZGoode
author_rank: Frequent Contributor
timestamp: February 20, 2025, 06:30:44 pm
content: I just got the copy of the manual from the bloke down in South Africa, thankfully it appears to be complete with schematics and mechanical layouts. I knew this was an older piece of kit, but I didn't realize how old it was until I started digging into it. The main heart of this is an RCA 1802 microcontroller. When I get a chance to tear this thing fully down and scan the manual, I'll make sure to upload some pictures here. The thing is definitely an interesting piece of engineering.My unit appears to have come from the SONGS nuclear plant in Southern California, which is pretty neat.
new entry - Page 1
Forum section: electronics / general

author: bigendian
author_rank: Regular Contributor
timestamp: February 12, 2025, 10:53:12 am
content: Hi all,i am new from today here, working in opensource (embedded linux field) but with a good electronic passion till child age,designing often mcu-based or linux boards here.Happy to be in, hope to be helpful, and thanks in advance for the support.

author: Zucca
author_rank: Unknown
timestamp: February 12, 2025, 01:42:49 pm
content: Ciao!

author: Fryguy
author_rank: Regular Contributor
timestamp: February 12, 2025, 01:55:04 pm
content: Welcome to the place where insanity meets precision !

author: bigendian
author_rank: Regular Contributor
timestamp: February 18, 2025, 11:59:16 am
content: Thanks !
welcome advice about my job outlook - Page 1
Forum section: electronics / general

author: trilerian
author_rank: Regular Contributor
timestamp: February 11, 2025, 07:20:25 pm
content: I am running into a bit of a conundrum...About 2 years ago I got really interested in electronics, specifically for RC cars. Since this time I have started my own business making a few different tools for this hobby. I am still quite new to electronics and decided I would go back to school and expand my associates degree into an electrical engineering degree. My actual job (you know, the money making one) is network engineering, and I work remotely. I was able to get an agreement with my boss that I could take some classes during the day and work after hours for project work (kind of happens anyway). However, my chain of command has now changed, and I now report to the new company that acquired my company, and they are not going to allow me to take anymore classes during the day. Although they still expect me to work 3-4 nights every week on changes... Anyway, new company is extremely toxic, crazy amount of projects that need to get done with short timelines. The experience is great, getting me acquainted with Azure networking and SDWan, but the flexibility of being able to take classes is gone. Which is ironic since they went to a flex time off plan now and I don't get actual PTO anymore (I hate that!).Anyway, now that I have started classes again I don't want to stop, it took me years to finally figure out what I wanted to major in for a bachelors and I would like to continue on. But realistically I can't quit my job to go to school fulltime, and it is unlikely I can find a new gig that will allow me to continue taking classes during the day. An internship seems unlikely as well since I would make about a quarter of what I currently make.Anyone know of a good online degree track for electrical engineering? I like physically going to class, but online would be better than nothing... Future state, I hope to have enough business one day to be able to just work my business - pipe dreams and all.

author: rstofer
author_rank: Super Contributor
timestamp: February 14, 2025, 03:09:08 pm
content: Google 'online accredited electrical engineering degree' and the University of Arizona shows up among others. Make sure your program is ABET accredited. University of California at Riverside also shows up.
Mistake, mischief or mean? - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: February 15, 2025, 10:36:42 am
content: I would like to post the following, just to clarify a thing, and to question the behaviour of others. A behaviour, that i consider archaic and stupid. I might be wrong, and that userjust made a mistake, and if so, i would like to apologize for what i am about to write. But i already had similar situations with others, so i am writing this now:So there is someone, that helped quite a bit in improving a product, but he made also some mistakes. Now people are really bashing on that one, and cant stop? Those people dont have too many goodarguments, and dont give too much resources of information (at least information that is relevant), nor do they try (or rarely try) to investigate issues to confrm or disproove. But they apply tactics to make one look bad. Specific questions that would disproove their claims are not answered...I will just post the latest example (and maybe do a little collection, if that does not stop, or gets worse).After all, anyone is free to ignore me, if my findings are bogus. But leaving out crucial information, or not answering specific questions, is as good, as burning witches like centurys ago.The issue (click the link to see the relevant screenshot):Quote from: eTobey on February 10, 2025, 09:13:25 pmThe bashing (extended bashing, but shorted quote. Leaving out the crucial "B" in every test of his):Quote from: newbrain on February 11, 2025, 12:20:15 pmComplains about my rudeness?Quote from: newbrain on February 11, 2025, 01:59:57 pmYet that user is following someone that is "rude"? :(see screenshot "notnice.jpg")To me it looks, that this user has some issues! Archaic and stupid social issues. And he is not alone.If someone is interested a bit more in psychology, research for "Semmelweis", and how he was treated until his dead, despite what he actually brought to society.If you are interested in the underlying topic, follow the following link:https://www.eevblog.com/forum/testgear/how-common-is-this-sorting-order-in-scopes-and-linux/

author: Simon
author_rank: Unknown
timestamp: February 15, 2025, 02:42:16 pm
content: Sorry who is it that has issues? Please, just don't bother.
Datasheets for TE parts on Digikey - Page 1
Forum section: electronics / general

author: piguy101
author_rank: Regular Contributor
timestamp: February 12, 2025, 01:19:25 am
content: Has anyone noticed that the datasheet links on Digikey for parts from TE are now just pdfs of a catalog listing instead of the actual datasheet?This part is an example. The datasheet is just a useless catalog listing.https://www.digikey.com/en/products/detail/te-connectivity-passive-product/35607K5FT/9927404?s=N4IgTCBcDaIMwFYBsAGA7AaQQMQCogF0BfIATry the datasheet link. It's just a catalog. Fortunately, Mouser still hosts a proper datasheet link for the part.https://www.mouser.com/ProductDetail/TE-Connectivity-Holsworthy/35607K5FT?qs=gZXFycFWdANIByGK1atjdg%3D%3D

author: thm_w
author_rank: Super Contributor
timestamp: February 12, 2025, 01:46:39 am
content: You can use the "Feedback" button on the right side of the page.

author: ataradov
author_rank: Super Contributor
timestamp: February 12, 2025, 02:55:42 am
content: DigiKey started linking to files on the vendor site instead of hosting those files. Likely a cost saving measure, but as result half the links are broken and others lead to whatever vendor wants.Mouser still hosts stuff locally.

author: piguy101
author_rank: Regular Contributor
timestamp: February 12, 2025, 03:26:46 am
content: Quote from: thm_w on February 12, 2025, 01:46:39 amGood point, done!Another example is the Digikey link for this TE relay:https://www.digikey.com/en/products/detail/te-connectivity-aerospace-defense-and-marine/EV200AAANA/1209930?s=N4IgTCBcDaIKIDUwAZkEEMDk0gLoF8gThe "datasheet" is just a generally useless pdf with information like Halogen content (and lists the relay is hand solderable!) but with no characterization plots or mechanical dimension information.

author: Andree Henkel
author_rank: Regular Contributor
timestamp: February 12, 2025, 01:06:16 pm
content: in theory this should give you the latest up to date datasheet revision.in practice it is a horrible mess
Fake ADC16DV160 or no? - Page 1
Forum section: electronics / general

author: PlushTush
author_rank: Newbie
timestamp: January 10, 2025, 08:01:24 pm
content: I have 2 ADC16DV160 from different suppliers. Moreover, the one on the left is problematic: out of ten such soldered ones, one does not work. It can be seen that the key and the coating of the contacts are different. The datasheet says it should be NiPdAuAg. I couldn't find what it should look like on the Internet. Maybe someone could tell exactly how the original ic should look or even share an image.

author: thm_w
author_rank: Super Contributor
timestamp: January 10, 2025, 09:56:10 pm
content: Looks like you added the photos in this thread:https://www.eevblog.com/forum/manufacture/fake-adc16dv160-or-no/Quality is not really good enough to see anything.Does the IC on the left have a shorter height? Does it look like its been sanded down and relasered?If so they could be salvaged parts. Unlikely to be fakes since most work.

author: PlushTush
author_rank: Newbie
timestamp: January 14, 2025, 11:41:52 am
content: Quote from: thm_w on January 10, 2025, 09:56:10 pmI have not precise tool to measure such small differences but with my calipers i can say, that both of ic is same height.But it is not the point. Maybe someone had deal with this ADC can tell by photo wich coating is seems more genuine?

author: Haenk
author_rank: Super Contributor
timestamp: January 14, 2025, 02:15:34 pm
content: I find the logo on the left device a bit odd, too thick? The logo on the right device looks OK to me.

author: PlushTush
author_rank: Newbie
timestamp: January 31, 2025, 07:20:05 am
content: Quote from: Haenk on January 14, 2025, 02:15:34 pmyes, maybe someone has same problem, or has this kind of ADC for photo to find differences...

author: stars
author_rank: Newbie
timestamp: February 07, 2025, 09:40:38 am
content: This is the original original look, I feel that yours is not quite right, you can compare and see, I often purchase electronic components from distributors, I have not encountered fakes, they have a professional QC quality inspector to help me test and pass before sending me, the price is also very favorable, if you need, I can share my supplier to you!

author: PlushTush
author_rank: Newbie
timestamp: February 12, 2025, 02:57:37 pm
content: Quote from: stars on February 07, 2025, 09:40:38 amThank you a lot! Your photo realy seems to me with original part. It will be very helpful if you share your suplier.

author: wraper
author_rank: Unknown
timestamp: February 12, 2025, 03:08:11 pm
content: From looking on the bottom side, it's 100% salvaged from e-waste. Brand new QFN parts don't have lumpy solder coating on the pads. Likely relabeled too. IC on the right looks dodgy too. Just with more effort put to make it look brand new.
Any projects to make use of idle rechargeable packs (500-1000mAh/5-10V)? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: February 10, 2025, 12:33:12 pm
content: What to do with a few NiMH and NiCd battery packs left from former remote controlled toys?They are sitting in a box for many, many years already, doing nothing. Measured them out of curiosity, and they can still hold 50-80% of their nominal capacity. Most are series AA size cells, anywhere between 4 and 8 series cells, but the most common is 6s1p, so 7.2V nominal.For some reason, 2-3 of them developed some white oxide at the negative pole. Not sure why. I think the oxide can not be battery leakage, because the negative pole is the solid metal can. The metal can doesn't look pierced or damaged, only that it is covered with a thick layer of about 0.5mm of fine crystals.Some are NiCd, others are NiMH, of about 0.5-1Ah measured at 0.2 of their nominal C, though they are not very capable at high currents. Feels like a waste to let them rot unused. Any project ideas?

author: shabaz
author_rank: Frequent Contributor
timestamp: February 11, 2025, 06:39:17 am
content: Depends on how simple/complex you're looking for, but a possibly useful idea could be a flashlight that's always in standby and turns on with power failure, or when unplugged from the power supply.Maybe it could be dimly lit when in standby and brightly lit on failure. I think it could be done with a trickle charge (e.g. 1/20 C or even lower; doesn't need to be particularly speedy), and maybe a changeover relay and resistor for the dim option.I think Ni-MH is underrated for DIY projects; many just use LiPo which has some disadvantages too.
Tip of the day: Do not reply to spambots - Page 1
Forum section: electronics / general

author: Siwastaja
author_rank: Super Contributor
timestamp: February 16, 2025, 08:38:03 am
content: From another thread, but what I'm going to reply applies everywhere:Quote from: tggzzz on February 14, 2025, 10:32:04 amEven better suggestion: stop responding to spammers. They know what they are doing:spamming works. Therefore, they don't read your suggestions. It's a largely automated process. Even if they somehow looked at what responses they get (e.g., to improve their process), they don't turn into better human beings by reading your scolding.Also pointing to others that obvious spammer is spammer adds no value, only further noise.Simply report to moderators. They delete the spam messages. They do it pretty quickly hereBut clearly, the moderators have higher threshold deleting messages like yours. New noise appears, and now with original spam message deleted, it's weirdly out of context.

author: Ian.M
author_rank: Super Contributor
timestamp: February 16, 2025, 09:07:35 am
content: +1Our moderators appear to generally have a 'tread lightly' policy, so I can understand why they don't simply delete all messages that refer to the deleted spam, as sooner or later they would be accused of over-moderation. However, we can all clean up our own mess by deleting or editing our own messages that refer to the spam!

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 16, 2025, 09:30:44 am
content: That was what I was thinking too.Just report it to the moderators when you suspect something to be spam, and let them deal with it.The old thread just got new attention and members started responding to the original question again, making indeed more noise.

author: magic
author_rank: Super Contributor
timestamp: February 16, 2025, 12:04:03 pm
content: You don't understand how important it is to post something negative in every thread started by Faringdon
Where can I get angled battery nickel strips like these?  - Page 1
Forum section: electronics / general

author: artvandalai
author_rank: Regular Contributor
timestamp: February 03, 2025, 10:30:14 pm
content: Anyone know where I can get these angled battery nickel strips? I searched on aliexpress and ebay but wasnt able to source any like these.

author: thm_w
author_rank: Super Contributor
timestamp: February 04, 2025, 10:32:30 pm
content: Low volume: cut it yourselfHigh volume: contact sellers on alibaba and ask for a custom strip or whatever similar stampings they havehttps://www.alibaba.com/product-detail/SMT-SMD-THM-DIP-Battery-solder_1601322358384.htmlhttps://www.alibaba.com/product-detail/Battery-Connector-18650-Nickel-Plated-Stainless_60488279130.htmlhttps://www.alibaba.com/product-detail/Custom-Soldering-Metal-Nickel-Plated-Steel_1601007412655.html

author: artvandalai
author_rank: Regular Contributor
timestamp: February 04, 2025, 10:57:45 pm
content: Ive messaged them
Help with Identifying these - Page 1
Forum section: electronics / general

author: Cyclotron
author_rank: Unknown
timestamp: February 03, 2025, 06:46:45 pm
content: I picked up a significant component mixed box at a hamfest this past weekend and can't identify the components in the image attached.

author: Xena E
author_rank: Frequent Contributor
timestamp: February 03, 2025, 06:53:45 pm
content: Ceramic trimmer capacitors.

author: Cyclotron
author_rank: Unknown
timestamp: February 03, 2025, 07:41:47 pm
content: Quote from: Xena E on February 03, 2025, 06:53:45 pmWell, that explains why I couldn't measure much of anything across them. I didn't consider that they may be capacitors, but given the source, I should have.Thanks!!
Invention of the day:  The rotaluger - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: February 02, 2025, 03:17:52 pm
content: Tadaaam!!! Proudly presenting ...  ... The rotaluger!Click to enlarge.Click to enlarge.What you see in the plots is the PSRR (Power Supply Rejection Ratio) of four different schematics of a voltage reference. Note how the green line corresponding to the PSRR of the 4th schematic goes to almost 200dB CMRR, this is insane. The 4th schematic, V(out13), is the rotaluger.Note how the transistors in the 4th schematic are all connected with their CE in reverse. That's why the name, rotaluger is regulator in reverse.However, in reality the measured PSRR was only about 60dB for the rotaluger,Click to enlarge.Way worst than the 180dB predicted by the LTspice simulation, not sure why.Even so, it's still fun that it works at all, with all the transistors in reverse.Credits:This finding sprouted from another topic ofDabbot,https://www.eevblog.com/forum/projects/self-biased-zener-reference-using-wilson-current-mirrors/after some talk, and aftermagicposteda simplified schematic of theLT1236LS8precision reference. I was trying to look at the influence of transistor's Beta, and being lazy to define ako models in LTspice (for transistor models with different different beta), I've just reversed the CE to get the equivalent of a much lower Beta, and boom, the simulated PSRR went to 180dB!I'm still not sure why in LTspice the PSRR for V(out13) is 180-200dB.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 03, 2025, 01:27:21 pm
content: Did a few more tries, both in simulation and in practice. The huge 190dB PSRR seen in the simulation seems only an artifact, because the BJT models in LTspice are not accurate enough when compared with a physical transistor.The mirror with transistors in reverse doesn't mirror much, so the whole thing with transistors reversed was working on the breadboard more or less like a 2 transistors constant current generator for LED.I don't think it is possible to make it work in practice with the performance shown in LTspice. Either the 2 normally connected BJT (as a CC), or the 3 normally connected Q LT1236 style (normally as in not CE reversed) will work better than the 3 reversed transistors.

author: tom66
author_rank: Super Contributor
timestamp: February 03, 2025, 01:41:26 pm
content: You won't get 200dB PSRR simply because the thermal noise of a system like this will become the dominating factor, there is a reason radio telescopes use cyro-cooled amplifiers, no other way to pick up E.T. on the other side of the galaxy. I'm guessing LTspice doesn't bother modelling this because it's computationally expensive and rarely a factor. Opamp models might include it though as it can be modelled as a function of gain easily enough.
Traco Power website is down? - Page 1
Forum section: electronics / general

author: squadchannel
author_rank: Frequent Contributor
timestamp: February 03, 2025, 05:01:10 am
content: http://www.tracopower.com/"Error 503 Backend unavailable. connection timeout"what happened? changing to a mobile connection did not help. hmmm....It's been a week now. I'm in trouble.

author: Poroit
author_rank: Frequent Contributor
timestamp: February 03, 2025, 05:05:57 am
content: Its connecting OK from Oz.https://www.tracopower.com/int

author: squadchannel
author_rank: Frequent Contributor
timestamp: February 03, 2025, 05:10:36 am
content: When I use a VPN I can connect fine. I think this is my environment problem.hmmm... my IP is blocked? I didn't do anything.what is strange is that I get 503 even when I use a mobile connection, so something is wrong.

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 03, 2025, 05:48:09 am
content: Works fine on my side too. Though, getting to the homepage is very snappy, but going to any product page takes a few seconds, so their database server may run on a Raspberry Pi or something.
Diyode Magazine Has Ceased Publication - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: March 03, 2024, 08:34:41 am
content: It's gone after 8 years.https://diyodemag.com/news/thats_a_wrap_on_diyodeQuote

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 03, 2024, 08:47:25 am
content: Not too surprised, but sad.

author: ludzinc
author_rank: Unknown
timestamp: February 03, 2025, 02:36:23 am
content: And now it seems like it is gone forever - "This site can't be reached"RIP DIYODE.

author: coromonadalix
author_rank: Super Contributor
timestamp: February 03, 2025, 02:38:12 am
content: R.I.P
What's wrong with Dave with the colors?...:-)))) - Page 1
Forum section: electronics / general

author: unicornio
author_rank: Contributor
timestamp: February 02, 2025, 12:25:45 pm
content: What's wrong with Dave with the colors?...While I conscientiously respect the color code, Dave is going crazy through life!...:-)))

author: EEVblog
author_rank: Unknown
timestamp: February 02, 2025, 12:29:51 pm
content: Quote from: unicornio on February 02, 2025, 12:25:45 pmI don't understand how this involves me?

author: unicornio
author_rank: Contributor
timestamp: February 02, 2025, 12:40:05 pm
content: I'm sorry, Dave, forgive me, I have already edited the post, it is the first time I use my phone to post in the forum and I will not do it again, it has been a disaster, it has cost me a lot to edit it and leave it more or less. ..:-)It's about a video of you with a riden that used yellow and green cables for a DC and it made me laugh...just that...my eyes hurt when I see colors that are not the agreed upon ones...:- )))I greatly appreciate your response...I take this opportunity to send you a cordial greeting, I have never spoken to you but I have been following you for many years...Health, Mate!...
Static electricity & lab clothing - Page 1
Forum section: electronics / general

author: W4PJB
author_rank: Regular Contributor
timestamp: January 31, 2025, 01:35:19 am
content: As we enter the coldest, driest months of the year in the northern Yankeesphere, it's become quite obvious how efficient humans can be at accumulating electrons as we go through our day. Especially fleece jacketsIt had me thinking, for those who regularly work in static sensitive environments, is static electricity a consideration when choosing your daily attire? If so, what kinds of fabrics do you choose, and what do you avoid?

author: Jackster
author_rank: Frequent Contributor
timestamp: January 31, 2025, 06:55:06 pm
content: Synthetic clothing is the worst when it comes to a buildup of static. You best options are natural fibers like cotton,wooletc or working butt naked.Ideally, you will want to lay ESD flooring and humidify the air throughout your workspace.Use ESD worktop bench materials (EEVBlog did a great video on this a few years back), grounding points with ESD wrist straps etc.

author: watchmaker
author_rank: Unknown
timestamp: January 31, 2025, 10:12:44 pm
content: In addition to the above, we keep our humidity level at 40-45%. Also helps with keeping the heat down (62 degrees). New Hampshire.

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 31, 2025, 11:34:55 pm
content: Yes, avoid synthetic AND wool.Ideally, your floor would be grounded too (it may just be the area below your bench) and you'd use a wrist strap.And, conductive strips under your shoes too if you really want maximum safety.

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 31, 2025, 11:36:28 pm
content: Quote from: Jackster on January 31, 2025, 06:55:06 pmCotton yes but wool? No.
Not thinking it through: a NULL problem - Page 1
Forum section: electronics / general

author: nali
author_rank: Frequent Contributor
timestamp: January 31, 2025, 09:42:16 pm
content: Guy gets a custom licence plate. As soon as I heard "null" I knew where this was going...

author: Analog Kid
author_rank: Super Contributor
timestamp: February 01, 2025, 12:06:50 am
content: Heh. Good one.But what kind o'accent is that? "Compu 'er"?

author: tom66
author_rank: Super Contributor
timestamp: February 01, 2025, 01:47:51 am
content: See also, "Christopher Null", who works for Wired (a bit of nominative determinism there) and has had many issues with his name.https://www.wired.com/2015/11/null/

author: nali
author_rank: Frequent Contributor
timestamp: February 02, 2025, 09:37:52 am
content: Quote from: Analog Kid on February 01, 2025, 12:06:50 amThat's Irish, to be sure. It does sound a little comical to us English at times, but I quite like it.Regarding nominative determinism, I wonder if my old Electronics lecturer from college is still around and reading this board? Hi Mr Sirkett if you are!
cheap anti-ESD connections - Page 1
Forum section: electronics / general

author: unicornio
author_rank: Contributor
timestamp: February 03, 2025, 12:05:27 am
content: I've seen on YouTube that several of you are using these cheap connectors to connect anti-esd equipment and accessories...I want to share with you that the two banana connections are connected to ground, but the other two are not...obviously the bananas are isolated from the metal that supports them, and the other two connectors have no contact with the bananas, and, in fact, the paint is so good that there is not even continuity between them...:-)So check them and if it's like what happened to me, plug in the soldering iron...:-)
Selling question - Page 1
Forum section: electronics / general

author: trilerian
author_rank: Regular Contributor
timestamp: January 26, 2025, 05:22:57 pm
content: Let's say I wanted to sell a piece of test equipment. Let's say that I upgraded that piece of test equipment by scouring the posts on here for information on doing that for free.Should I revert that piece of equipment back to the original licenses before selling, or should I just state in the description that it has been "hacked"?Is their any legal ramification on selling a piece of test equipment that has been "hacked"?Does "hacking" the equipment lower the resale value?I haven't fully made up my mind in selling anything, kind of struggling on that front. Anything I would want to sell would be entry level, and I am not sure it is worth the hassle of selling it, yet I really don't need it anymore. Hmm... I guess I can just hold on to the stuff too. Idk.Speaking of, what do ya'll do with your boxes? Test equipment is large enough, but the boxes are huge. It's always funny when getting something new, how do I make this work on my bench? But then the, where do I put this box, comes next.

author: themadhippy
author_rank: Super Contributor
timestamp: January 26, 2025, 05:43:17 pm
content: Quoteflatten them out,they take hardly any space then.

author: NE666
author_rank: Frequent Contributor
timestamp: January 26, 2025, 05:47:03 pm
content: Quote from: trilerian on January 26, 2025, 05:22:57 pmPersonally, I would. It avoids the potential for any post-sale issues, legal or otherwise. It makes the easiest life for you. The seller is fully and unambiguously informed as to what it is that they should expect to receive, which will be as documented by the vendor for the model number. If they know the product, then they are probably also well aware of its potential to be hacked, should they wish to perform the process themselves, and will bid accordingly as to what value they personally attach to that 'capability'.Again, imho, the form of hacking you're talking about here certainly doesn't increase the value of such an item as a) the hack is 'public knowledge' and the new owner can apply it themselves, and b) there is no guarantee that the efficacy of these hacks won't be negated in a future FW release.Whether it devalues it is down to the sensibilities of the prospective purchaser.Hence, as I said, my default position would be to revert; nothing to gain in value by offering the hacked version, only the potential to put off some purchasers.

author: nctnico
author_rank: Super Contributor
timestamp: January 26, 2025, 05:53:33 pm
content: Quote from: themadhippy on January 26, 2025, 05:43:17 pmI always throw the boxes away as these take too much space and attrack insects which nest in the boxes (paper / silver fish love boxes for example). If you need to ship the equipment, get a new box and bubble-wrap padding.Where it comes to hacked licenses: be clear about it so you don't pretend to make money from something you didn't pay for. I wouldn't mess with unhacking as this is just extra work and may cause problems. If it ain't broken, don't fix it.
Macrium trying to move perpetual licencees to subscription based - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: January 25, 2025, 04:25:05 am
content: Got this message today.QuoteHad a right go at him and absolutely disgusting. I told him everything I buy HAS TO FUNCTION regardless of what happens out there and should not depend on internet access to operate. There is NO WAY I'LL do that, I'll keep it as it is like with Ghost until it don't work with newer stuff anymore and I'll find something else.That's holding it to ransom. I suggested if they wanted my custom they should keep both models open. There needs to be a choice.Also the computers I use it on don't NEED internet access. I have no intentions of connecting them up so the software can check it's subscription absolutely ridiculous.Disc imaging and I mean basic disc imaging, no fancy should not depend on internet to work.Without my approval and custom he's not going to be very "successful" is he? but I am sure there are many more people who'd put up with that nonsense and the buzzwords.Buzzword bullshit:Reflect X, "Customer Success Team, I'm reaching out to you."I'd rather waste time and mess about with Clonezilla at least I good success with EFI back in 2017 than use a subscription stuff for something so simple..It seems to me the only important to them is holding the software ransom.What do you think?

author: BradC
author_rank: Super Contributor
timestamp: January 25, 2025, 08:47:43 am
content: Yes, I'd explain politely where he can insert their new license scheme. Sounds like the perfect business model to encourage users to move toward piracy.

author: MrMobodies
author_rank: Super Contributor
timestamp: January 25, 2025, 06:32:22 pm
content: I had the same thought about reminding them of piracy like what happened two decades ago after the next response from them but they won't be getting any more custom from me unless they reinstate perpetual licensing.I thought as a loyal customer they wouldn't stoop that low.They could work on new updates more frequently for the subscription model and release the perpetual versions at a slower pace and at least they'd get some custom for many directions instead of just one.I could understand the subscription model being aimed at a type of customer, say a business that is going to open up short term say for only a year. They purchase say 10 to 20 licenses then shut down after that year where they won't need them anymore but when I want a machine in the far corner of my room with this software on there that may not have been used for many years to extract a disc image I made back then and for it TO NOT WORK due to activation/subscription checks then it's useless to me. In fact it seems worse than HP+ E series printers that won't work without internet and I remember reading something about withdrawing it for laserjets.https://boingboing.net/2024/07/09/hp-will-no-longer-sell-printers-that-require-online-connection.htmlQuote
L298N Motor Driver Module Testing - Page 1
Forum section: electronics / general

author: Sefton Dave
author_rank: Newbie
timestamp: January 25, 2025, 12:41:24 pm
content: Hi all, I have purchased several L298N Motor Driver Modules and I think they may be faulty.I have connected 12v motors to both motor output terminalsIf I connect 12v pos and neg to the boards I get the led indication that power is on the board.All links are left in position on the board.I get 5v out from the board to indicate that the 5v regulator is OKAccording to information on testing, If I take a lead from the 5v terminal and, in turn, touch any of the other 4 pins on the board, I should get motor rotation.When doing this I get both motors to rotate but only in one direction.I have also used a negative lead to ensure one pin high and one pin low but get the same result.Am I correct in thinking that the boards are faulty, I bought 4 of them off E-BayMany Thanks.Dave

author: Benta
author_rank: Super Contributor
timestamp: January 25, 2025, 08:28:54 pm
content: Which motors?Which modules?My crystal ball is being serviced.

author: Sefton Dave
author_rank: Newbie
timestamp: January 26, 2025, 10:09:43 am
content: This is how I am testing the L298N Motor Driver ----Test is demonstrated here on YouTube -https://youtu.be/NEYU_yFhhsIEach motor only rotates in one direction.The motors that I am using are simple 12v P.C. fansI assume that I have bought dudsThanks again.

author: darkspr1te
author_rank: Frequent Contributor
timestamp: January 26, 2025, 10:51:15 am
content: The lm298 driver need two pins for direction change, the driver has EN for enable motor and DIR for direction change,so if EN=1,DIR=0 it goes one way and EN=1,DIR=1 it will go the other way,see more info herehttps://howtomechatronics.com/tutorials/arduino/arduino-dc-motor-control-tutorial-l298n-pwm-h-bridge/#:~:text=The%20L298N%20is%20a%20dual,and%20explain%20how%20it%20works.darkspr1te

author: tooki
author_rank: Super Contributor
timestamp: January 26, 2025, 11:43:20 am
content: Quote from: Sefton Dave on January 26, 2025, 10:09:43 amPC fans are not simple DC motors! They are BLDC motors with integrated controller boards. You absolutely cannot get them to reverse direction by applying reverse polarity (in fact, that often kills them).Your driver boards are almost certainly just fine. But you don’t know how to use them, and you need to learn about motors in general first.

author: Sefton Dave
author_rank: Newbie
timestamp: January 26, 2025, 12:12:16 pm
content: Many thanks, you just beat me to it.It was the PC fan not the board.As you say, I will have to learn about DC motors but at the age of 77 I don't have much time left!David

author: tooki
author_rank: Super Contributor
timestamp: January 27, 2025, 01:21:51 am
content: I’ve actually only really just started dipping my toes into motor control myself! :p
Bench outlet strip clamp mounts (Tripp Lite PSSS2C) - Page 1
Forum section: electronics / general

author: Hifi Necromancer
author_rank: Contributor
timestamp: January 24, 2025, 10:25:05 pm
content: I'm attempting to track down a set of clamp mounts for a Tripp Lite/Eaton PS series power strip. Unfortunately the "official" mounts (PSSS2C) have been discontinued and I can't find them anywhere. Does anyone have a lead on these, or know of a similar product that's suitable?https://www.mouser.com/ProductDetail/Tripp-Lite/PSSS2C?qs=rkhjVJ6%2F3EKKZNW3XDQ%2Frg%3D%3D

author: thm_w
author_rank: Super Contributor
timestamp: January 24, 2025, 10:32:07 pm
content: Various sites list them as being in stock, did you try to order?Of course they may just come back to you and say its not in stock, but its not clear where you tried to purchase from.

author: Hifi Necromancer
author_rank: Contributor
timestamp: January 24, 2025, 11:38:08 pm
content: I reached out to eight stores that listed the clamps as in-stock, and only three of them responded...nobody actually had them in inventory. As is often the case with smaller retailers, I suspect the part would have shipped directly from the manufacturer when you order from them.

author: thm_w
author_rank: Super Contributor
timestamp: January 25, 2025, 12:09:34 am
content: I would build something myself.But if you want the same style, similar products are available:https://www.aliexpress.us/item/3256806039330953.html
RV-8803-C7 price increase - Page 1
Forum section: electronics / general

author: Radiohead
author_rank: Contributor
timestamp: January 22, 2025, 09:03:15 pm
content: Hello everyone,I wanted to assemble a test PCB I'd forgotten about which uses the RV-8803-C7 real-time clock. I needed to check the datasheet for the pin 1 indication and went to Mouser where I had ordered the part (December 2023). I was flabbergasted when I noticed the current price; €1001,68 a piece! I check my order history and I've bought them at €3,72. Is this a pricing error from Mouser or is there a good story to this price hike?Mouser's current pricing:I'm afraid to assemble the test PCB now!

author: thm_w
author_rank: Super Contributor
timestamp: January 22, 2025, 11:16:46 pm
content: Yeah must be some kind of mistake.https://www.mouser.ca/ProductDetail/Micro-Crystal/RV-8803-C7-32.768k-3PPM-TA-QA?qs=7bTaA%2FLYtSb5zZOilbtzxw%3D%3DThey have similar parts for that $4-5 range.