hybridfree/eevblog-posts huggingface dataset:
Why is the half-bridge circuit voltage unbalanced in atx power supply  - Page 1
Forum section: electronics / general

author: electronium
author_rank: Newbie
timestamp: December 20, 2023, 07:01:36 am
content: Hello baby, I hope you are doing wella questionWhy does the voltage of the big capacitors of the warm part of the half bridge go out of balance in the atx power supply? So that according to the photo I sent below? And how will this problem be solved, and if it is not solved, what will happen to Power?

author: MathWizard
author_rank: Super Contributor
timestamp: December 21, 2023, 10:02:04 pm
content: I can't see that schematic picture big enough. If it's a forward converter type SMPS, those 2 big caps, should be the supply voltage to the top of primary side, main switching inductor. Are they in series, and they are not sharing the voltage equally ? Is that what you're talking about ? IDK how even they would be new, maybe 40%, 60% voltage split, would be acceptable. But I would not like if only it was 10, 20, 30% of the voltage on 1 cap.If main's input was 170V rectified, and there's no boost stage like PFC, then maybe it's still not a big deal in series if they are new and rated 250V. IDK, but I would like more equal voltage division, if that's what's you mean. Are you saying 1 cap heats up more too ? Have your checked them with a capacitance meter and ESR meter ?
Best benchtop reflow oven for less than $9k - Page 1
Forum section: electronics / general

author: LAPSKRFC
author_rank: Contributor
timestamp: December 19, 2023, 01:00:27 am
content: Hi everyone, we are looking for an issue-free reflow oven for prototyping purposes for less than $9k (lead-free soldering). Can you please let me know what is the most reliable machine we can get for this price range?Thanks in advance

author: GridWork
author_rank: Contributor
timestamp: December 20, 2023, 08:19:49 pm
content: I've got one of these:https://www.ddmnovastar.com/product/gf-b-ht-reflow-ovensIt does have a nitrogen option available if you have dewar or bottled nitrogen available. I've been pretty happy with it thus far. They also have a mini-conveyor based version, but I haven't used one of them.

author: thm_w
author_rank: Super Contributor
timestamp: December 20, 2023, 10:25:23 pm
content: https://www.eevblog.com/forum/manufacture/

author: u666sa
author_rank: Frequent Contributor
timestamp: December 21, 2023, 07:47:38 pm
content: It's actually been on my list for a while. This one.http://termopro.ru/en/
What are these pins in mutimeter victor vc97? - Page 1
Forum section: electronics / general

author: electronium
author_rank: Newbie
timestamp: December 20, 2023, 06:21:56 am
content: What are these pins and what is the purpose of resetting the device in these pins?

author: MathWizard
author_rank: Super Contributor
timestamp: December 22, 2023, 01:44:20 pm
content: There's the upper and lower supplies Vdd and Vss, then microncontroller port numbers, and the the reset or whatever. IDK for sure about the MCU on the DMM, but that should be for uploading the firmware to it, or calibrating it, or some other tweak or readout for testing and programming it.The group below looks like a serial data interface, SPI or I2C or other like those. I don't know them well enough yet. It may also goto the MCU, or maybe to a ROM chip. Looks like a write protect pin, so probably the ROM chip.I think some of these are capable of logging to a PC, they have some logic output pin on the MCU, just for it. And a common way to get the data to PC, was to use an infrared LED and some little circuit for the PC. I think it used one of the usual serial data protocols

author: tooki
author_rank: Super Contributor
timestamp: December 23, 2023, 01:40:48 pm
content: Quote from: MathWizard on December 22, 2023, 01:44:20 pmSCL/SDA are I2C. (SPI is MISO/MOSI/CS.)
D201A low power SSB modulation - Page 1
Forum section: electronics / general

author: Crambone
author_rank: Frequent Contributor
timestamp: December 20, 2023, 08:06:17 pm
content: Radio is working perfectly as receive is very, very strong on all Bands and Channels. On AM I dead key 4.2 watts and swing 28 but on SSB I’m only seeing 10 watts. I went through the ALC c tuning procedure in the manual and I’m not getting any adjustment on R719, R719 sees 97 vdc on leg from R720, on center leg I can adjust from 0 - 97 vdc I set it to 55vdc for now and ground on other leg. I get no power or modulation increase at all stays the same.On the yellow wire coming from the band switch I see 0vdc rec and upto -90vdc on TX with modulation on both LSB & USB?Where to check?
Are these the same encoders from Mouser? - Page 1
Forum section: electronics / general

author: Pcmaker
author_rank: Regular Contributor
timestamp: December 23, 2023, 12:46:12 am
content: I have a mouse from 2008 that is discontinued but due to a physical disability, it's the one and only mouse I can use, so Have to keep repairing the same 4 mouse I have and they sell for a lot on eBay, so I have to keep these going.I replace the encoders as they go bad. Once they start jumping around when I'm scrolling, I have to replace it. I've tried other tricks, but they don't seem to work.I bought these encoders from Mouser years ago and they work, then I bought another 100 a few days ago, and they look different. I used the same parts # from before, but as you can see one has Encoder says "Alps D" and the other says "Alps Y" and the color in the back is also differentAre these the same? Will it work? I can't afford to break one of my mice

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 23, 2023, 12:58:40 am
content: That's the exact same MPN and both from Mouser (so I highly doubt any of these could be non-genuine Alps).The letter is probably just indicative of the year of production, batch, or something like that.You can have a look at the whole range of this series of encoders:https://tech.alpsalpine.com/e/products/category/encorder/sub/03/series/ec10e/and see if there may be a difference worth noting (and supposing that Mouser may have sent the wrong reference among these.)In any case, there's no harm possible. All of these 3-pin encoders, even from other manufacturers, have the same pinout and each A,B,C pin have similar functions, it's just switches.All that could change would be the number of pulses per turn and whether it has detents or not.

author: Pcmaker
author_rank: Regular Contributor
timestamp: December 23, 2023, 01:56:58 am
content: Quote from: SiliconWizard on December 23, 2023, 12:58:40 amCan I use any other type of encoder? These ones break way too easy. Maybe I should find an encoder that is smooth without the detents? It's what breaks on these. When you move the wheel once forward, sometimes it goes back and my eyes can't process that, making me dizzy
Ross Video - RVS216A or RVS210A video mixer "Service Manual" sought.  - Page 1
Forum section: electronics / general

author: minsik
author_rank: Contributor
timestamp: December 19, 2023, 11:42:13 pm
content: Hi looking for a possible service manual for a Ross Video video switcher RVS216A an 16 input analog mixer with effects, fading, wipe etc.Ross Video support forum have helped by providing a package ZIP of related info but no actual cct into. the operation manual does have very basic block diagram stuff.Looking to work on a unit thats quite old and now has a temperature fault when hot and doing a fade it blacked out and needed a reset and a couple of other temperature related faults.Yes i have bought the old freezer spray and have a hot air source (favorite hair dryer) so equipped as well as can be I suppose.Seems I have gone as far as the source and they cant help more than they have done so. This is just a long shot try!I believe was also available in RVS210A 10 input maximum version so that would also be great if I can get the actual schematics.thanks for considering.Minsik.
(Solved) Zoom conference invite link to a .exe... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: December 19, 2023, 04:25:05 pm
content: Hi everyone,I received a zoom meeting invite from a law firm. However it happens to be a link to the law-firm's host with a huge file name of characters ending with a .exe. Is this normal for zoom invites? My PCs are old and run Win7, I don't believe my virus definitions can be updated beyond 2020. I just need to be safe....

author: eutectique
author_rank: Frequent Contributor
timestamp: December 19, 2023, 04:28:23 pm
content: Looks like a scam.Do you know this law firm? Did you have any tele-conversation with them before? Do you expect any in the meantime?You can check the email headers to see who the real sender is.

author: tom66
author_rank: Super Contributor
timestamp: December 19, 2023, 04:51:17 pm
content: This is an approach taken by Webex and Zoom. I think it's a terrible, terrible idea... but it is how they do it. That doesn't preclude this being a virus, though, it could be legit... or it might not be. (Which is why it is a terrible idea!)One way you can be sure is if you download but do not open the file, you can check if the file is digitally signed by who you expect. For instance, this is a recent Webex meeting file, it is signed by Cisco so I can be pretty sure it is legit unless Cisco's private key has been compromised (which would be a big deal!)

author: eutectique
author_rank: Frequent Contributor
timestamp: December 19, 2023, 05:05:03 pm
content: Quote from: tom66 on December 19, 2023, 04:51:17 pmSo, you have the whole webex.exe in the "meeting file", right? Does it work in Linux?

author: BrianHG
author_rank: Super Contributor
timestamp: December 19, 2023, 05:50:17 pm
content: Issue solved...The link works without sending me a .exe on my laptop which already has Zoom installed on it.
Meter frequency measurement module - Page 1
Forum section: electronics / general

author: electronium
author_rank: Newbie
timestamp: December 20, 2023, 06:15:45 am
content: Hello guys, I hope you are doing wellIs it possible to measure city electricity frequency and pwm peak of power transistor with this module? How is it possible?

author: TizianoHV
author_rank: Regular Contributor
timestamp: December 20, 2023, 11:11:44 am
content: Hi,this "DIY Digital LED Frequency Counter 1Hz-50MHz USB 5V Crystal Oscillator Meter Tester Kit" is not able to measure directly mains voltage (max 5V). You'll need a step down transformer and probably a voltage divider.If you search online you can find cheap 220V-12Vac lamps transformers and add a voltage divider to step down 12VAC to around 1.5VAC (2.2k / 220R). Or you can use one ZMPT101B module (https://it.aliexpress.com/item/32810872584.html?spm=a2g0o.productlist.main.1.235d72f1KsgXg1&algo_pvid=5cedd623-1aa3-43be-aafb-4a6810c65149&algo_exp_id=5cedd623-1aa3-43be-aafb-4a6810c65149-0&pdp_npi=4%40dis%21EUR%211.29%211.29%21%21%211.38%21%21%402103853f17030696575861289e8150%2110000000419948036%21sea%21IT%213408016261%21&curPageLogUid=pECiFK0w13YZ) and regulate it to the correct voltage. Before connecting to mains put everything in a box to avoid touching mains.What do you mean with "pwm peak of power transistor"?
Put wiring in parallel ?  What about solar panels with active electronics (out) - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: December 25, 2023, 10:37:23 pm
content: I was telling the roommates; "You've got to use caution if your solar panels have normal active d.c. output (when attempting a parallel hookup).Is that correct ? Raw panels I could see how that would increase the current supplied. But my (several) little solar trickle automobile battery 'keep alive' top off chargers each have active control electronics, or at least an LED, and so might not operate in expected parallel.Maybe that caution would only apply if my solar panels have an active voltage controlling circuit...Now, I'm not sure, if simple parallel of two trickle chargers is safe, and works, to speed up an update of battery charge. Certainly would be considered a low-power fault in any case, which wouldn't hurt anything ?Thanks

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 26, 2023, 06:24:52 pm
content: If you're using optimizers, check the directions for how they're supposed to be wired. Most are intended to be connected in series. But I suspect what you have are simple PWM controllers and will work fine in parallel.

author: RJSV
author_rank: Super Contributor
timestamp: December 26, 2023, 10:06:02 pm
content: The automobile trickle chargers are intended for placing them, temporarily, on dashboard or whatever, and plug the little panel module into std. cigarette lighter socket. That way it can trickle charge.Purchased at popular auto parts retail store, or some big box retailers.My question would be more straightforward if each of several of those units had a VOLTAGE output regulator. Obviously, in that case the multiple units (when wired in parallel) would fight each other's controlled output, given that the units don't match perfectly.Thanks

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 27, 2023, 01:07:42 pm
content: PWM controllers in parallel work just fine, if one turns off before the others, all you get is a more gradual ramping down in average output current.
2161 AISEG - The 1700% Efficient Free Energy Generator From COP 28 - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 17, 2023, 07:16:31 am
content: COP 28 is a scam.

author: MT
author_rank: Super Contributor
timestamp: December 17, 2023, 12:54:30 pm
content: Quote from: SiliconWizard on December 17, 2023, 07:16:31 amHOW DARE YOU!

author: Stray Electron
author_rank: Super Contributor
timestamp: December 17, 2023, 03:00:52 pm
content: Quote from: SiliconWizard on December 17, 2023, 07:16:31 amThe US representative there, John Kerry, is an idiot plain and simple. Nearly everyone in the US realized that when he gave numerous speeches when he attempted to run for the presidency a few years ago. He is azealotwith no common sense and he can't do basic math and it willing to sacrifice anyone or any industry or any country's national economy for his unrealistic climate demands. IMO the US couldn't possibly have found a representative with LESS credibility than John Kerry!Between people like John Kerry being a part of it and the protestors that were constantly jumping up on the stage and screaming out their demands and the protestors blocking the entrance to the building, the entire event was a pathetic joke.

author: tom66
author_rank: Super Contributor
timestamp: December 17, 2023, 09:03:38 pm
content: Quote from: SiliconWizard on December 17, 2023, 07:16:31 amIf you mean it's a scam in that it's being held by an oil state and governed by an oil executive who literally has said that the fossil fuel industry will bring the change we need () then you're dead right.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 17, 2023, 11:49:11 pm
content: You two gave two of the reasons, there are many more.

author: jonovid
author_rank: Super Contributor
timestamp: December 18, 2023, 12:02:49 am
content: the hole thing is a scientific scam. based on 1990's computer modeling trying tosimulate or predict the weather 20 to 30 yrs into the future.COP 28 , UNIPCC and other so called green movements are more about global politics & communism.
Broken server hosting - Page 1
Forum section: electronics / general

author: monikaayers
author_rank: Newbie
timestamp: December 15, 2023, 11:16:40 am
content: Broken server. What to do?

author: eutectique
author_rank: Frequent Contributor
timestamp: December 15, 2023, 11:38:47 am
content: Fix it.
High speed, low resolution camera ideas? - Page 1
Forum section: electronics / general

author: axemaster
author_rank: Contributor
timestamp: December 17, 2023, 12:36:59 am
content: Hi all, I'm trying to find a very high speed camera for an experiment I want to try. I'm wondering if anyone knows of a reasonably priced source? I don't need lenses to go with it as my setup will be custom optics...Frame rate = >10k frames/sec (preferably >100k)Resolution = at least 64x64 pixelsIt would be used in bursts of maybe 2000 frames, between which the memory would be read out to a PC.Any thoughts? All the high speed cameras I've found have been high-resolution, which isn't needed for my case.
Two old school Finns invents the Elvis rock and roll machine with smoke and all! - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: December 13, 2023, 06:56:37 am
content: Best RUD of the entire fair!

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 13, 2023, 05:10:40 pm
content: Brings a whole new meaning to "Hit and Miss" engine.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 14, 2023, 11:43:22 pm
content: But why?

author: pickle9000
author_rank: Super Contributor
timestamp: December 15, 2023, 01:20:33 am
content: woah nellie.

author: themadhippy
author_rank: Super Contributor
timestamp: December 15, 2023, 01:46:33 am
content: looks like its attempting to leave the building
TRAM D201A wiring / mod ? Question - Page 1
Forum section: electronics / general

author: Crambone
author_rank: Frequent Contributor
timestamp: December 12, 2023, 09:52:55 pm
content: I picked up a 201A and it’s not receiving good on groups of channels 13-20 & 31-35 so I figu I would look at the synthesizer board. I removed and cleaned black channel control, removed a few crystals and they all checked ok. I also looked at the trimmer caps and they are all working. All the diodes tested good also.When looking at voltages on Pin 1-12 I’m getting some voltages when I shouldn’t and some I should see are missing.So now I’m thinking either this mod (clarifier unlock ?) is causing the voltages?I took a pic of a sketch I did of S4 crystal / manual switch and where the cut wires go.I also took an underside pic.
Tesla Optimus Gen2 robot - Page 1
Forum section: electronics / general

author: wraper
author_rank: Unknown
timestamp: December 13, 2023, 03:29:23 am
content: https://twitter.com/i/status/1734756150137225501

author: MT
author_rank: Super Contributor
timestamp: December 13, 2023, 04:18:54 am
content: Optimus 1 could dance and Optimus 2 does something to an egg , perhaps Optimus 3 can boil eggs and dance at the same time?!

author: AVGresponding
author_rank: Super Contributor
timestamp: December 13, 2023, 03:09:19 pm
content: Meanwhile at Boston Dynamics:https://bostondynamics.com/atlas/?wvideo=q023xjh898

author: wraper
author_rank: Unknown
timestamp: December 13, 2023, 03:56:40 pm
content: Quote from: AVGresponding on December 13, 2023, 03:09:19 pmI'm well aware about Boston Dynamics. However Tesla started robot development just about 2 years ago while Boston Dynamics does it for decades. Also Boston dynamics have never shown anything similar to hands with fingers that can do delicate operations.

author: tom66
author_rank: Super Contributor
timestamp: December 13, 2023, 04:40:34 pm
content: This really isn't that special - nothing that hasn't been seen in research programmes and prototypes already.If Tesla can show a robot that can reliably run without falling, climb uneven and slippery surfaces and manipulate arbitrary tools they might have a claim to state of the art, but as it is, it's hard to see how this robot fills a niche that isn't already filled by other robotics.The human body form isn't exactly ideal for a lot of things that we do every day. Tesla did say they wanted to use Optimus in building cars, but we already have robotics to do that, that are specialised to the task at hand like installing windows and welding, where would Optimus fit in? So excuse me if this isn't that impressive.
Replacing fast blow fuse with PTC resettable...  - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: December 11, 2023, 08:12:48 pm
content: Hello my fellow DiYer's,Are there PTC resettable fuses that are fast acting?I've found some PTC fuses that claim 0.1 second max time to trip which seems would be fast enough I'm assuming... Correct?The fuse is on the output of a lithium battery RC charger. It's there for reverse polarity protection. I was looking to replace it with a resettable fuse if possible.The stock fuse is a (Size 1206) SMD 30a fast blow / acting.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 11, 2023, 08:35:36 pm
content: Have to know the fusing rating of the protective element (antiparallel diode?).You also need a PTC with low enough resistance to do the job, and high enough breaking capacity (peak current) to not destroy itself on a short-circuit battery. These are not easy to come by; I don't know offhand, but there may not even be a combination that satisfies these constraints, as they all depend on each other to some extent.Alternately, an electronic solution could be employed, basically a MOSFET, plus transient protection to ensure it handles hot-plugging.Tim

author: Geoff-AU
author_rank: Frequent Contributor
timestamp: December 12, 2023, 07:14:24 am
content: A PTC needs to heat up, and this takes a lot of time.You probably want a TBU.

author: thm_w
author_rank: Super Contributor
timestamp: December 13, 2023, 12:57:50 am
content: 30A seems high for a stock fuse, what is the maximum charging current?
TRAM D201A wiring / mod ? Question - Page 1
Forum section: electronics / general

author: Crambone
author_rank: Frequent Contributor
timestamp: December 12, 2023, 09:53:46 pm
content: I picked up a 201A and it’s not receiving good on groups of channels 13-20 & 31-35 so I figu I would look at the synthesizer board. I removed and cleaned black channel control, removed a few crystals and they all checked ok. I also looked at the trimmer caps and they are all working. All the diodes tested good also.When looking at voltages on Pin 1-12 I’m getting some voltages when I shouldn’t and some I should see are missing.So now I’m thinking either this mod (clarifier unlock ?) is causing the voltages?I took a pic of a sketch I did of S4 crystal / manual switch and where the cut wires go.I also took an underside pic.
Watch electricity hit a fork in the road - Page 1
Forum section: electronics / general

author: MarkF
author_rank: Super Contributor
timestamp: December 06, 2023, 10:00:39 pm
content: What is everyone's thoughts?I see a bunch of miss statements.And one big blaring one where he doesn't consider the impedance of the scope probe.Still, it's thought provoking.

author: Benta
author_rank: Super Contributor
timestamp: December 06, 2023, 10:04:56 pm
content: Sorry, not going to waste 26 minutes of my time for some dude doing self-promotion.The crap being offered on YT is mind-boggling.

author: Jan E L
author_rank: Contributor
timestamp: December 11, 2023, 05:40:59 pm
content: I would realy see a debunk video about this. I'm just a happy amature and for me this video looks logical...But I have also seen a lot of spin offs of the Veritasium - How Electricity Actually Works video. And that sounds the most logical and this Alphaphoenix film goes against this - again? Or am I wrong and just dont see how there both right but look at it from two different points

author: ebastler
author_rank: Super Contributor
timestamp: December 11, 2023, 08:30:57 pm
content: Quote from: MarkF on December 06, 2023, 10:00:39 pmIt certainly seems to get people's attention. Three separate threads in the same forum section here, and counting...https://www.eevblog.com/forum/chat/how-the-electricity-spreads-in-wires-its-not-over!/https://www.eevblog.com/forum/chat/visually-intriguing-electrons-current-visualised/

author: newbrain
author_rank: Super Contributor
timestamp: December 11, 2023, 09:10:31 pm
content: Quote from: MarkF on December 06, 2023, 10:00:39 pmThe probe was 10×, so10 MΩ + a handful of pF? does it really matter here? Care to explain why?Not extremely rigorous, and with some hand waving, but still I think the results are valid, and exactly what I would expect.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 12, 2023, 01:15:39 am
content: Yes, that's again nothing much that you can't model with transmission lines. Nothing groundbreaking here, and the experiment, while not perfect, looks "good enough" for the purpose.Funnily enough, in a different (but related) question, the "experiment" that Dr Lewin was showing his students and that made a lot of talk here (and elsewhere) was a lot less rigourous than that.

author: tggzzz
author_rank: Super Contributor
timestamp: December 12, 2023, 01:29:09 am
content: I'd like to see him try to explain what happens when the electricity hitsthese"forks in the road"
Panasonic Heatpump EMI noise - Page 1
Forum section: electronics / general

author: Rosch
author_rank: Newbie
timestamp: December 13, 2023, 04:45:44 pm
content: I recently installed A Panasonic heatpump, the WH-WDG05LE5 Outside unit with the WH-ADC0509L3E5 inside unit it is a hydraulic split so no messing around with refrigerant. Aside from some detestably stupid decisions regarding non existing air purge valves. The thing works quite well and is relatively quiet. However it sends out some rather annoying noise that I can hear and that my speakers pick up. 6.5kHz. When the inverter compressor turns on the noise starts. So my question is what can I do about it? Added is my measurement setup probably dumb as hell but anyway there it is

author: SeanB
author_rank: Super Contributor
timestamp: December 13, 2023, 05:21:36 pm
content: Insufficient mains filtering in the unit, or the power wiring is common to your room, and not a separate connection back to the distribution board. If you are sharing the same socket outlet, most likely, then you need to install a mains filter in the line to the AC unit, rated for it's run current, and another to the equipment in your room. Otherwise a separate cable to the distribution board, and a separate breaker for it, still with a mains filter to the equipment in your room.

author: Rosch
author_rank: Newbie
timestamp: December 13, 2023, 06:20:26 pm
content: So the interesting thing here is. It has its own circuit breaker, a dedicated run to the mains distribution board. I have a 3 phase supply and have already switched to a different phase, the heatpump is the only thing on this particular phase at the moment. And it made no difference switching phases.

author: SeanB
author_rank: Super Contributor
timestamp: December 13, 2023, 06:26:37 pm
content: So it needs a line filter on the supply by the heat pump.
Semiconductor theory  - Page 1
Forum section: electronics / general

author: DMartens
author_rank: Contributor
timestamp: December 09, 2023, 06:44:47 am
content: In textbooks, an intrinsic (=pure) semiconductor crystal is always drawn as a two-dimensional grid of neatly arranged atoms (usually Si or Ge) with 4 valence electrons each, forming covalent bonds with 1 electron each of its 4 neighbouring atoms, giving 8 valence electrons in the outer shell. But in practice, the crystals are three-dimensional, so each atom has 6 neighbours instead of 4.So why do we always draw them as 2-D structures? Why can we make this simplification? What would change if we did not do this simplification? How would that impact the analysis of the semiconductor devices? What would change in the formulas we derive?

author: Nominal Animal
author_rank: Super Contributor
timestamp: December 09, 2023, 01:08:48 pm
content: The 3D bulk structure of silicon and germanium isface-centered diamond cubic, not basic cubic.The 2D regular square lattice is not a representation of the actual atoms' positions, only of their rough interactions: in the 3D face-centered diamond cubic lattice, each atom in the bulk has 4 nearest neighbors (and not 6, as you assumed).

author: MarkT
author_rank: Frequent Contributor
timestamp: December 10, 2023, 12:18:14 pm
content: Quote from: DMartens on December 09, 2023, 06:44:47 amSi and Ge are a covalently bonded diamond lattice, unsurprizing given they are in the same column of the periodic table as carbon.Diamond is also a semicoductor, though you have to heat it up a bit to get mobile charge carriers as the bandgap is huge.MIT have a great EDx course:https://mitxonline.mit.edu/courses/course-v1:MITxT+3.15x/

author: mawyatt
author_rank: Super Contributor
timestamp: December 10, 2023, 02:17:42 pm
content: An interesting use of Si with added Ge was to enhance the base emitter properties of bipolar transistors with IBM way back in late 80s. However, another use was for straining the Si lattice to create faster MOS devices. The Si lattice was strained by the selective implant of Ge to produce a MOS transistor where the Carriers Mobility was improved, thus improving speed. This became a very popular CMOS fabrication method to create a faster MOS devices.Best,
Kathy's Deep Dive Historical Response to Veritasium’s DC Electricity Video - Page 1
Forum section: electronics / general

author: ledtester
author_rank: Super Contributor
timestamp: December 10, 2023, 06:54:37 am
content: Kathy of Kathy Loves Physics has produced a response video to the Veritasium circuit video.It seems much of her critique involves an argument bout surface charges and the (mis-)interpretation of the Poynting vector. In the comments a person by the name of Eric L. Michelsen has this to say:QuoteHis "Funky Electromagnetic Concepts" paper may be found at:https://emichels.physics.ucsd.edu/FunkyElectromagneticConcepts.pdfHis discussion of the Veritasium video and Poynting vector begins on page 69.
Replace 54 pin memory with 66 pin memory? Will this possibly work? - Page 1
Forum section: electronics / general

author: u666sa
author_rank: Frequent Contributor
timestamp: December 09, 2023, 08:41:14 am
content: Task -- replace W9825G6JH 4 M x 4banks x 16 BITS SDRAM in 54 tsop2 with HY5DU121622CTP-D43 8M x 4banks x 16bits in 66 tsop2.Legend:66 pin chip54 pin chipPossible questionable things:1.. LDQS, UDQS situation. Not used?2.. VREF. Should come on after VDDQ. What to do?3.. LDM, UDM situation. Does connecting to LDQM and UDQM looks legit?4.. /CK differential. Can it just be connected to CK?Datasheets:54 pin chip --W9825G6JH.PDF(803.78 kB - downloaded 24 times.)66 pin chip --HYSCS02664-1.pdf(1623.9 kB - downloaded 28 times.)What do you think?
Farnell - very bad customer service, terrible delivery delays - Page 1
Forum section: electronics / general

author: max-bit
author_rank: Frequent Contributor
timestamp: December 08, 2023, 11:53:41 am
content: I buy from many companies supplying electronic components:DigiKey, Mouser, Farnell- and here I will comment on the latter supplier.Farnell- a large supplier of electronic components, I have been buying there for over 15 years.A few years ago, when I was shopping there, it was very convenient and quick. Orders placed before 5 p.m. were delivered the next day. Fast without problems, support worked immediately.Unfortunately, the quality of service has been dropping dramatically there for several years.Parcels are sent with a multi-day delay, the staff sends responses from a template, and no one from the staff knows anything.Parcels get lost and no one can do anything about it, you have to ask for a refund for the amount paid for many days (weeks). Generally, only a complaint to the bank (chargeback) triggers a reaction.In general, the service is getting worse every year, you can't rely on timely deliveries. Deliveries and whether we receive the goods are similar to "Russian Roulette" except that we have 5 bullets in a 6-round magazine.I would like to know if others have similar problems? Please write

author: max-bit
author_rank: Frequent Contributor
timestamp: December 08, 2023, 08:56:24 pm
content: Here are typical stupid answers from Farnell (copy paste)Hope you’re doing good!This email is regards to order reference - 9679xxxx.We hope this message finds you well.We regret to inform you that there has been a delay in processing and shipping your recent order through UPS.Our team is actively addressing the situation to ensure a swift resolution.Please feel free to contact me if you need any further information.Regards,Nethra. RCustomer Service Representative [Premier Farnell]
Adjustable motion detector light bulbs gone – why? - Page 1
Forum section: electronics / general

author: ccktek
author_rank: Regular Contributor
timestamp: December 13, 2023, 04:12:42 pm
content: These Elrigs bulbs worked perfectly for my applications but are now suddenly unavailable anywhere. Found some on Ebay, ordered and paid for them, was informed by the seller that they had none. I believe they use microwave motion detection. Three adjustments control motion and light sensitivity and time on. I can find no equivalent product. Anyone know what’s going on here? Suitable replacement?https://www.amazon.com/Elrigs-Equivalent-Sensitivity-Twilight-Adjustable/dp/B07G59HDCT

author: Zero999
author_rank: Super Contributor
timestamp: December 13, 2023, 07:05:20 pm
content: It seems a bit wasteful to replace the whole thing, when the lamp goes.I had a quick look and found these. No doubt a 120V version can be found in the US.https://cpc.farnell.com/pro-elec/pell0217/microwave-sensor-lamp-holder/dp/LP12676?mckv=s_dc|pcrid|426684131231|kword||match||plid||slid||product|LP12676|pgrid|100371160798|ptaid|pla-880761629753|&CMP=KNC-GUK-CPC-SHOPPING-9262013734-100371160798-LP12676&s_kwcid=AL!5616!3!426684131231!!!network}!880761629753!&gclid=Cj0KCQiAyeWrBhDDARIsAGP1mWQm2xQbrRoeWiq9CKqsLA4cQOeezx2UT8NFgZS7aW_ETfI-3c0jQkUaAiG5EALw_wcB

author: ccktek
author_rank: Regular Contributor
timestamp: December 13, 2023, 09:31:20 pm
content: Many thanks 0999. Using your link as a starting point, I did manage to find and order an equivalent for 120V.

author: thm_w
author_rank: Super Contributor
timestamp: December 13, 2023, 10:08:03 pm
content: Quote from: Zero999 on December 13, 2023, 07:05:20 pmIn some cases this wouldn't fit whereas the lamp with built in detector will. But good to know these exist.
What is minimal amount of connections inside a 4-pole to have gain > 1? - Page 1
Forum section: electronics / general

author: dusan
author_rank: Regular Contributor
timestamp: December 04, 2023, 11:32:44 am
content: I have a theoretical question. Consider this 4-pole black box, what connections inside it are required for it to have gain more than 1?I am only certain about 2 connections:1. there must be connection between input and output (otherwise signal would not be able to pass.2. there must be connection between vcc and out (otherwise there would be no gain > 1, it needs power)But I'm not sure about other connections. It is possible to have gain > 1 without:3. gnd to out4. vcc to gnd5. in to gnd6. in to vcc

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 04, 2023, 12:15:15 pm
content: Voltage gain, current gain, or power gain? A transformer can be used to increase voltage or current with no power supply other than the signal itself.

author: wraper
author_rank: Unknown
timestamp: December 04, 2023, 12:29:46 pm
content: It is possible to have voltage or current gain with just 3 terminals. In, out and either GND or VCC. To amplify power, you will need all 4.

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 04, 2023, 12:44:08 pm
content: Thinking about it some more, if the input has multiple frequencies and you're only interested in a subset of them, you can use the power in the other signals to boost the signals you're interested in. I recall someone successfully used one crystal radio tuned to a strong station to power a single transistor amplifier for another crystal radio tuned to a weaker station.

author: wraper
author_rank: Unknown
timestamp: December 04, 2023, 01:27:16 pm
content: Quote from: NiHaoMike on December 04, 2023, 12:44:08 pmWell, if you start applying certain conditions, by adding a resistor in series with VCC (or GND) you can combine power supply with signal output. But it's not what is shown in question.

author: ebastler
author_rank: Super Contributor
timestamp: December 07, 2023, 10:10:03 pm
content: Quote from: NiHaoMike on December 04, 2023, 12:15:15 pmGood question. I have heard that they sell backbox devices, e.g. for improving your mains outlet's power efficiency/cleanliness/whatever -- withzero connectionsinside, and with highfincancialgain.
Visually intriguing... electrons, current visualised.. - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: December 06, 2023, 05:23:32 pm
content: Doesn't Spice have a run-mode designed to characterise how a DC migrates toward a stable state from a set condition (like off to on)

author: thm_w
author_rank: Super Contributor
timestamp: December 07, 2023, 11:14:49 pm
content: This video was great, ton of effort to get the actual data instead of just showing a simulation.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 08, 2023, 12:53:57 am
content: Yes, rather well done.Something you can indeed simulate with a transient simulation and proper modeling of transmission lines, but a good experiment showing what happens is great.

author: BrianHG
author_rank: Super Contributor
timestamp: December 08, 2023, 03:33:18 am
content: AlphaPhoenix's hardware setup:
Ceramic resonator vs crystal - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 05, 2023, 12:24:19 am
content: Do resonators need more drive power than crystals? Since they have lower Q?Pretty sure if a datasheet specifies a ceramic resonator, I can just slap in a regular quartz crystal, but won't it be over-driven? We're talking uW in any case but...Doesn't a crystal oscillator also take longer to stabilize? Is there some risk of inconsistent power up state?
Restoration of a Rolex GMT Watch From 1958 - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: December 04, 2023, 03:55:04 am
content: Get to about 10 minutes in.Pretty amazing the fine detail work that goes into this.Not to mention the mechanical engineering and parts manufacturing from 65 years ago.

author: andy3055
author_rank: Super Contributor
timestamp: December 04, 2023, 05:20:16 am
content: Try this channel: Nekkid watchmaker.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: December 04, 2023, 06:07:21 am
content: I have enjoyed several of this guys videos. I am amazed that he keeps track of all the tiny parts with a relatively small number of organizers.

author: Black Phoenix
author_rank: Super Contributor
timestamp: December 04, 2023, 03:48:15 pm
content: This guy is nice and I see some of his videos previously but he talks a lot.I'm more onto the ASMR with subtitles like the Red Dead Restoration channel.This one even restored one of his vintage machines, an Elma Banquet cleaning and and trying machine.
Is there any standard for SMD marking? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: November 30, 2023, 04:36:14 pm
content: I know nobody has the time to debug to the component level any more, but each time I have to lookup SMD markings it's like shooting in the dark. I know there are, and even have a few SMD catalogues, but unless the part is a very common jellybean, chances are I'll never find what it is.I see here "what SMD is this?" question quite often, so what are we missing? Is there any marking standard?How is one suppose to know what a SMD component is, and find its datasheet? How do you identify, for example, non-obvious 3-6pins parts?

author: thm_w
author_rank: Super Contributor
timestamp: November 30, 2023, 10:08:34 pm
content: https://www.eevblog.com/forum/beginners/identifying-smd-components/https://www.eevblog.com/forum/beginners/marking-codes-of-smd-components/No standard.Google: various iterations of part marking + package name

author: SimplyElectronics
author_rank: Contributor
timestamp: December 03, 2023, 01:00:39 pm
content: https://www.repaircompanion.com/smd_code_search
DS1052E SCPI Commands for phase deviation measurement - Page 1
Forum section: electronics / general

author: interflexo
author_rank: Regular Contributor
timestamp: November 29, 2023, 11:29:45 pm
content: I have a DS1052E oscilloscope running 00.04.02 SP1 firmware.Using the UI Measure -> Phas1->2^ it measures the phase deviation between the two channels (CH1 and CH2) at the rising edge.I can't find the SCPI command to retrieve the same measurement. Other SCPI commands gave the expected result.I tested the DS1000Z equivalent command :MEAS:RPH? with no success (timeout error).I can retrieve the CH1 period and the CH1 to CH2 delay in rising edge using SCPI commands and calculate the phase angle in degrees, but this takes two commands.Anyone can shed some light over this subject?

author: interflexo
author_rank: Regular Contributor
timestamp: November 30, 2023, 09:24:59 am
content: The SCPI command ":MEAS:PDEL? CHAN1" only works if I do a manual UI Measure -> Delay1->2^ first. After that works like a charm.When it does not work it outputs a dummy 9.9e+37 value...At least with the first crap example (100Hz or 1KHz sinus wave on RC filter) tested.Useless. What's the point?Regarding SCPI this throws me to downloading the waveform, fiddling with the points, deal with the noise crap...I suppose the 00.04.04 firmware from 2020 does not address these issues...
Axial fan inserts - Page 1
Forum section: electronics / general

author: veedub565
author_rank: Frequent Contributor
timestamp: November 10, 2023, 08:09:36 am
content: I'm replacing an axial fan which has threaded inserts fitted for mounting it. I can't find a suitable replacement with the same threaded insert fitted. Yes I know I could put a nut the other side instead, but the location of the fan in the equipment chassis makes this very tricky to do.I spoke to Orion fans who confirmed this is an OEM option with MOQ of 500. Obviously I'm not going to do that.Anyone know if it's possible to buy these inserts separately ?

author: Someone
author_rank: Super Contributor
timestamp: November 10, 2023, 09:09:35 am
content: TIL rivnut ?

author: veedub565
author_rank: Frequent Contributor
timestamp: November 10, 2023, 09:47:52 am
content: Yess, thanks that's the ones

author: veedub565
author_rank: Frequent Contributor
timestamp: November 10, 2023, 10:16:25 am
content: or even a threaded rivet bush

author: themadhippy
author_rank: Super Contributor
timestamp: November 10, 2023, 11:04:16 am
content: Quoteglue the nuts to the fan before fitting the fan

author: Gyro
author_rank: Super Contributor
timestamp: November 10, 2023, 07:41:05 pm
content: Quote from: veedub565 on November 10, 2023, 10:16:25 amWatch out for any kind of rivet nut/bush, you're liable to split the plastic.

author: TERRA Operative
author_rank: Super Contributor
timestamp: November 14, 2023, 12:36:01 pm
content: I'd look for an aluminium rivnut so it requires less force to set, and make sure the crush area is not inside the flange on the fan when inserted.Many rivnuts are designed for sheet metal, so the crush area is located accordingly.

author: veedub565
author_rank: Frequent Contributor
timestamp: November 30, 2023, 07:51:46 am
content: I actually managed to reuse the old ones in the end. I bashed them out with a drift, and used a vice to press them into the new fan. Bit of a faff but worked ok.Fan has a metal chassis so no plastic to split.
Wireless Charging Roads? (Solar roadways 2.0?) - Page 1
Forum section: electronics / general

author: tshackelton
author_rank: Newbie
timestamp: December 01, 2023, 06:56:46 pm
content: Does anyone have details on how much power transfer actually takes place while a vehicle is in motion? I assume it's not enough to run the headlights much less actually charge an EV...https://ground.news/article/new-technology-installed-beneath-detroit-street-can-charge-electric-vehicles-as-they-drive_d0b881

author: mendip_discovery
author_rank: Super Contributor
timestamp: December 01, 2023, 07:33:50 pm
content: Much like the charging of anything wirelessly it's just about how much are you will loose before it gets where you want it. Though it will be a fun way to steal electric.It's just throwing money at the wall trying to create a problem we didn't know we needed to solve. Somone will make money.

author: thm_w
author_rank: Super Contributor
timestamp: December 01, 2023, 10:46:20 pm
content: See the thread here:https://www.eevblog.com/forum/dodgy-technology/electric-road-in-detroit/this one can be closed.
Are there any power banks that can charge while outputing power? - Page 1
Forum section: electronics / general

author: aqarwaen
author_rank: Regular Contributor
timestamp: November 28, 2023, 07:57:10 pm
content: Are there any power banks that can charge while outputing power?I know it's not correct forum,but can somebody help me find power bank can do both charge and charge same+fast charge.Probably don't need larger than 10000 since larger are to heavy+big.I don't get why they are so hard and rare.do designers avoid them cuse they needs lots additional stuff or is it just controller what cost much compared to regular 1?

author: themadhippy
author_rank: Super Contributor
timestamp: November 28, 2023, 08:07:27 pm
content: Quotetry searching with the term pass through

author: Halcyon
author_rank: Unknown
timestamp: November 28, 2023, 11:07:45 pm
content: I have a cheapy re-badged job from Kogan that does:https://www.kogan.com/au/buy/kogan-26800-mah-powerbank-118w-with-pd-and-qc-30-black-kogan/(which doesn't help you too much being in the USA), but it's just some generic brand from China.I think the Anker ones do as well? However can't confirm as I don't have one on-hand to test.In Kogan's marketing material, they advertise it as having a "UPS" function (which just means charging and powering devices at the same time). Perhaps those sorts of keywords will help you in your search.

author: EPAIII
author_rank: Super Contributor
timestamp: December 02, 2023, 07:28:53 am
content: How about a car battery? Or a UPS? Or almost any rechargeable battery?

author: rteodor
author_rank: Frequent Contributor
timestamp: December 02, 2023, 10:07:22 am
content: I just got a new one the same model as an old one with puffed cells and surprise: while looking the same on the outside and in the spec the old one outputs power while charging but the new one does not.Maybe look for older ones or modify one.Or maybe get some "UPS module" like those for 18650 cells.

author: Psi
author_rank: Super Contributor
timestamp: December 02, 2023, 10:45:54 am
content: QuoteDoes this make anyone else want to connect the output to the input just to see if it releases any magic smoke or not?

author: rteodor
author_rank: Frequent Contributor
timestamp: December 02, 2023, 07:12:00 pm
content: Quote from: Psi on December 02, 2023, 10:45:54 amDid that to both of the packs mentioned above and - as expected - nothing really happened. The LED's flashed shortly and that was it. Both packs charge and discharge normally after.
Industrial Wireless Angle Sensor Recomendation. - Page 1
Forum section: electronics / general

author: rvalente
author_rank: Frequent Contributor
timestamp: November 27, 2023, 02:36:01 pm
content: Hello Mates,Im looking for some advice hereDuring the differential hub is assembly production is necessary to check the pinion-ring ratio, the ring is driven (with diff locked) by the nut runner for 15 turns, need to read the pinion turning angle (red circle on picture)I was thinking about a wireless and gyro based angle sensor (encoder), would assembly it to a jig, magnetically coupled, operator would pop in, drive the ring, the pinion rotates and its measured, pops out, next.I've not found any industrial sensor for this demand, what would you guys suggest me? I'm not looking to dev anything, prefer to apply, single use only.Greeting, Renan