hybridfree/eevblog-posts huggingface dataset:
Are laptop bluetooth adapters USB interface? - Page 1
Forum section: electronics / beginners

author: u666sa
author_rank: Frequent Contributor
timestamp: March 23, 2025, 12:30:02 am
content: I know laptop cameras connect via USB interface. Does an adapter like this one also connect via USB interface?

author: amyk
author_rank: Super Contributor
timestamp: March 23, 2025, 06:18:16 am
content: That one appears to use a BCM2070, which is definitely aUSB device.In general, the BT HCI is standardised to use either a UART or USB. The vast majority are likely to use the latter now.

author: u666sa
author_rank: Frequent Contributor
timestamp: March 23, 2025, 02:06:55 pm
content: This stupid thing was slowing down BIOS. It took sometime to boot to POST, then it took sometime to go from POST to windows boot. Then it took a long time until login screen. Then when you go to BIOS itself everything was slow and laggy.Bluetooth did not work.Removing it solved all issues.

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: March 23, 2025, 05:26:38 pm
content: It's a Bluetooth adapter card module. From the description, it does not look like it has a USB interface.https://www.amazon.com.be/-/en/geneic-Bluetooth-Adapter-Module-Thinkpad/dp/B08L3HHC8Phttps://www.ebay.com/itm/364842583889?chn=ps&mkevt=1&mkcid=28

author: nightfire
author_rank: Frequent Contributor
timestamp: March 23, 2025, 08:40:45 pm
content: In modern Notebooks, lots of low-bandwidth devices are connected via USB internally- simply because it is a standardized format, well-known, and easy to implement, especially on the drivers side, as there is much support in SDK etc.
are low-esr polymer caps suitable for IC bypassing? - Page 1
Forum section: electronics / beginners

author: exe
author_rank: Unknown
timestamp: June 21, 2018, 06:26:44 pm
content: Hello!I wonder if low-esr polymer electrolytic caps are suitable for bypassing, say, opamps and MCUs. I'm asking because I know paralleling low-esr caps can cause problems due to resonance. So, is it advisable to put polymer caps in parallel with normal 0.1uF MLCC?Has anyone tried to do any actual measurements?

author: David Hess
author_rank: Super Contributor
timestamp: June 21, 2018, 09:15:23 pm
content: Polymer aluminum electrolytic capacitors are fine for IC decoupling but usually overkill. More likely they would be used to decouple IC output power stages like MOSFET gate drivers and switching regulators.
are megohmmeters safe to use? - Page 1
Forum section: electronics / beginners

author: exe
author_rank: Unknown
timestamp: August 19, 2018, 10:32:41 am
content: Hello!I wonder if megohmmeter are safe to use. Many of them have output voltage up to 1kV.If they are safe, how can I make one that would also be safe to construct and use? I think charge pumps are inherently dangerous as they capacitance ready to quickly discharge through the body. One idea came to my mind is to put a resistor in series with each cap to limit the current...PS my final goal is to make a cheap and safe high-resistance meter from a high-voltage generator and current meter.

author: Gyro
author_rank: Super Contributor
timestamp: August 19, 2018, 10:57:27 am
content: I think commercial insulation testers already include current limiting measures and drop to zero when turned off. Of course there's still the possibility of charging up external capacitances.My 10kV insulation tester discharges itself, but if I've been using the non-clip probe to check things like SMPS transformers it can still leave 'slightly painful' charges on the capacitance between windings (a good sign of low leakage insulation).

author: Ian.M
author_rank: Super Contributor
timestamp: August 19, 2018, 11:06:05 am
content: They can be extremely dangerous (due to stored energy in the D.U.T) if you use them to test the insulation of a large capacitor or long cable and make contact with the D.U.T. during the test sequence. All commercially available modern ones will ensure the D.U.T. is safely discharged at the end of the test sequence as long as you do not disconnect the test leads while the test is in progress. Old ones may not have safety features like auto-discharge.

author: The Soulman
author_rank: Super Contributor
timestamp: August 19, 2018, 11:13:19 am
content: Of course they are safe to use as intended, but do not hold the probe and hit "test", you will get hurt.The purpose of these high voltages is to catch any breakdown in insulation.If you only want to measure high resistances use a couple of (9V) batteries in series and your dmm on the mV rangeas a current meter.Batteries are preferred because of the low noise.

author: SG-1
author_rank: Regular Contributor
timestamp: August 19, 2018, 11:19:21 am
content: Part of my normal work duties include ac dielectric testing up to 80kv. The procedures used determine how safe you are. I have an old Biddle with the hand crank & a modern fluke megaohm meter for home use. The instruction manuals for these include procedures for their safe use. Most important is not to come into contact with the specimen under test & to lower the voltage back to zero. Danger exists if test is interrupted, by failure or the operator, as cables, bus bars, arrestors, capacitors, can store energy.

author: The Soulman
author_rank: Super Contributor
timestamp: August 19, 2018, 12:09:00 pm
content: Attached is a little calculator that I've thrown together in excel when using a dmm as current meter on the volts or milivolts rangetogether with a external voltage source ("spanning test"), "weerstand X" is the resistance measured.Have fun
Are metal film resistors "fusible resistors"? - Page 1
Forum section: electronics / beginners

author: Axtman
author_rank: Regular Contributor
timestamp: April 30, 2019, 03:49:22 am
content: Are metal film resistors also known as "fusible resistors"?

author: TimFox
author_rank: Super Contributor
timestamp: April 30, 2019, 05:26:15 pm
content: About 35 years ago, we tried an experiment to see if low-resistance 1/4-watt carbon composition resistors (from Allen-Bradley) could be used as fuses to connect many circuit boards to a common power supply.They just sat there for a long time and smoked away when dissipating power several times their rating.We ended up using real "picofuses" (TM) with the same lead spacing (at higher cost) to get effective fusing.

author: Gyro
author_rank: Super Contributor
timestamp: April 30, 2019, 07:40:47 pm
content: Carbon Composition resistors can survive (and are spec'd for) amazingly large peak power dissipations. Yes, they will smoke and eventually catch fire but that will be the first sign of distress! I carried out some extreme tests for a discharge probe to use with my repaired 10kV insulation tester and didn't even observe any changes of resistance value...https://www.eevblog.com/forum/projects/resistor-extreme-pulse-overload-experiments/@Axtman: Flameproof fusible resistors with defined fusing characteristicsaremetal film, but that doesn't mean that all metal film resistors are fusible.

author: Axtman
author_rank: Regular Contributor
timestamp: May 06, 2019, 10:37:26 pm
content: I have a "junk box" full of 1K NOS resistors. How do I tell if I have a fusible resistor? Are there any special markings besides brown black red gold? (Of course I know what the carbon comp resistors look like.)

author: amyk
author_rank: Super Contributor
timestamp: May 07, 2019, 01:30:37 am
content: Quote from: blueskull on April 30, 2019, 03:52:43 amMade me post this...

author: Gyro
author_rank: Super Contributor
timestamp: May 07, 2019, 08:45:04 am
content: Quote from: Axtman on May 06, 2019, 10:37:26 pmFusible resistors usually have another band but this varies between manufacturers. The body colour also tends to be a redish 'cement' rather than the normal lacquer. Any background information to make you think they are fusible? The odds are that they are not. Post a photo...
are PC power supplies insulated from earth? - Page 1
Forum section: electronics / beginners

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: January 12, 2020, 04:20:13 am
content: stupid question but is the ground in my pc connected to earth?

author: wraper
author_rank: Unknown
timestamp: January 12, 2020, 04:22:05 am
content: Of course it is. There is 3 prong mains connector in PSU for a reason.

author: Zero999
author_rank: Super Contributor
timestamp: January 12, 2020, 10:24:38 am
content: Quote from: ELS122 on January 12, 2020, 04:20:13 amAre you talking about the 0V rail? If so, I believe it's normally connected to earth.

author: Brutte
author_rank: Frequent Contributor
timestamp: January 12, 2020, 11:04:00 am
content: Quote from: ELS122 on January 12, 2020, 04:20:13 amThat depends on the design of power supply.If your PC is desktop and it is connected to three-prongs mains receptacle then yes.But if this PC is a laptop with two-prongs(end to end) supply, or a laptop with three-prongs(end to end) supply connected to unearthed mains receptacle then the answer is: the only connection between earth and GND is via capacitive coupling of a transformer (<1mA) and MOV(>1kV).Of course this "floating" does not include a situation when you use two-prongs mains supply and ground laptop through USB shield to your printer which might be earthed.

author: Brutte
author_rank: Frequent Contributor
timestamp: January 12, 2020, 08:53:24 pm
content: Quote from: ELS122 on January 12, 2020, 05:06:48 pmThis isclass IIprotection class although I am not sure if this guarantees that the secondary side is unearthed..

author: Etesla
author_rank: Regular Contributor
timestamp: January 13, 2020, 02:22:25 am
content: Yes, but if your intention is to break this connection (for example to hook up multiple power supplies in series for a higher voltage), it is certainly possible.

author: pcmad
author_rank: Regular Contributor
timestamp: January 13, 2020, 11:04:59 pm
content: yes earth ground is the same as chassis ground on a desktop pc
Are Quicko and KSGer T12 Soldering Tips Interchangable?  - Page 1
Forum section: electronics / beginners

author: LooseJunkHater
author_rank: Frequent Contributor
timestamp: May 19, 2023, 02:58:17 am
content: Currently own (https://www.aliexpress.com/item/32889768195.html) soldering station and I quite like it. I'm not a big fan of the soldering handle as the tips are quite loosely held in and often throw an error that the tip isn't detected, but that's another issue (which I don't really know how to fix; suggestions?).Does anyone know whether I can use a KSGer tip in the Quicko Station?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 19, 2023, 08:07:54 pm
content: T12 should be compatible with a T12, but with the chinese you can never be sure.But if you don't like the quality of the handle, then look a bit further. There are different quality levels of handles for a T12 available. from "too cheap to be true" to "could be quite decent", but those cost a bit more.I also do not trust mains voltage power supplies from china much. Personally I'd rather buy some loose parts, and then, when you're selecting your handle, you will also find photographs of the internals of those handles

author: Algoma
author_rank: Frequent Contributor
timestamp: May 19, 2023, 08:30:15 pm
content: Biggest trouble with the cheap T12 tips is the coating. It will often burn and flake off of the cheaper ones, exposing the bare "metal" underneath that will oxidize and make for poor interaction and thermal transfer with the molten solder. Generally look for machined steel tips instead of the ones that look like re-casted recycled scrap if they show a closeup.That vendor does offer some of the higher grade tips, the extra cost is often worth the greater functional lifespan.https://quicko.aliexpress.com/store/group/XA-High-grade-tip/2954088_510934861.html"Mechanic" seems to also be a good T12 brand from Aliexpress, the tips are packed in a tube instead of a thin plasic bag.
Are Real time systems Hard/Soft or the RTOS itself? - Page 1
Forum section: electronics / beginners

author: abhishekkumar1902
author_rank: Regular Contributor
timestamp: July 30, 2018, 10:54:06 am
content: I just wanted to ask if there exists anything like a "Hard-time RTOS" or "Soft-Time RTOS" itself or is it the designer who defines a system as Hard-Real-time or Soft-Real-time irrespective of the any RTOS used?If there exists any "Hard-time RTOS" or "Soft-Time RTOS", do they explicitly specify that they are Soft/Hard? Any examples of such RTOSs?

author: Kjelt
author_rank: Super Contributor
timestamp: July 30, 2018, 12:51:10 pm
content: Good question, don't know if I can answer it but will do my best.There are hard and soft RTOS.The main difference per definition is that a hard RTOS will always process an task within its predefined timeframe/deadline, it is fully deterministic in behavior.A soft RTOS will on average handle the process within its predefined timeframe/deadline but it can run late on occasion.Now this is a very vague definition since it is not only the RTOS responsibility but also the programmer. The programmer should make sure that thecriticaltasks that need to be performed within the predefined timeframe/deadline have the highest priority and shall never run longer than said predefined timeframe/deadline in order to prevent blocking other critical tasks to be processed.This means that you need to analyze the pieces of software running, determine which ones are time critical and need to be executed within the predefined timeframe/deadline , measure the time these tasks need, if they are too large you should redesign and prioritize those tasks.Now this is a simple explanation, as you can see that the predefined timeframe/deadline is the smallest part, this also depends on the hardware it runs.If you get a twice as fast microprocessor the time of the tasks can be almost halved (never will due to overhead).So it is a combination of the RTOS itself, the programmer/software and the hardware.

author: Benta
author_rank: Super Contributor
timestamp: July 30, 2018, 05:21:47 pm
content: Real time is real time (the RT in RTOS). That being said, there are "slimmer" RTOS that allow for shorter response times at the cost of functionality.The decisive point is if the OS is deterministic in time, and an RTOS should fulfill this.

author: tggzzz
author_rank: Super Contributor
timestamp: July 30, 2018, 07:05:51 pm
content: Quote from: Kjelt on July 30, 2018, 12:51:10 pmBest if the RTOS is hardware, the processor has many cores, the softwarelanguage(not library) has parallel constructs and communications, and the IDE knows about all of that - and can tell youexactlyhow many ns each code path isguaranteedto take. See the XMOS xCORE processors, xC language, and xTIME IDE. Available from digikey.That just leaves the programmer, which is usually the weakest link. (Except for the person specifying the system, of course!)
Are surface mount Y2 capacitors less robust than thru-hole ones? - Page 1
Forum section: electronics / beginners

author: ocset
author_rank: Super Contributor
timestamp: August 26, 2018, 06:15:50 pm
content: Hello,The following VJ2220 series Y capacitors are surface mount and ceramic.SMD (ceramic) Y capacitorshttp://www.vishay.com/docs/45020/vjsafetycapsx7r.pdfAre they less robust to overvoltages and thermal expansion stress than Y2 capacitors which are radial and film based?The Radial Film based Y capacitors don’t state a “peak impulse voltage”…Radial (Film) Y capacitorshttp://www.mouser.com/ds/2/136/Y2_B81122-31746.pdf

author: floobydust
author_rank: Super Contributor
timestamp: August 26, 2018, 06:37:57 pm
content: Yes.

author: Kleinstein
author_rank: Super Contributor
timestamp: August 26, 2018, 06:52:42 pm
content: Class Y caps need to be pretty robust - this is what makes them meet the class Y requirements.Due to board stress is might be more demanding to meet this requirements in SMD form.The SMD form might need special care when soldering and for the layout to avoid extra stress - so they be more difficult to use. Having the note on peak voltage is likely not a significant difference.

author: ocset
author_rank: Super Contributor
timestamp: August 26, 2018, 09:59:48 pm
content: This link…http://www.kemet.com/Lists/Filestore/EvoxRifaRFIandSMD.pdf….states how films heal after high voltage stress’s, but ceramics don’t, but then it stops short of saying that their Y ceramic SMD capacitors are therefore less robust than their thru-hole Film Y capacitors….it just leaves you in the air, wondering

author: chris_leyson
author_rank: Super Contributor
timestamp: August 26, 2018, 11:09:52 pm
content: The answer is yes, surface mount Y caps are less robust than leaded components. I work in consumer electronics and we're talking about tens of thousands of PCBs. Anything over 50V rated is leaded, no arguement. Y caps are usually film in parallel with leaded disc ceramic, snubber caps are also leaded disc ceramic. There is a good reason for doing things this way, reliabillity.Whilst on the subject of mlcc caps, I recently I used some mlcc caps for bulk storage on the auxilliary power for a flyback and it's just come back and bitten my arse. The capacitance under bias is not 20uF it's a lot less. If there is a short on the secondary side the flyback controller goes into hickup mode and the hickup timing is determined by the value of the aux supply smoothing cap.If you've only got a few uF of capacitance then the supply hickups at 20Hz with 60% duty cycle and you got some seriously stressed devices. If the controller doesn't go into thermal shutdown then the flyback transformer runs at 75C above ambient continously !! Change the mlcc caps for a 22uF electrolytic and harmony is restored, hickup rate is a few Hz and the duty cycle is maybe 10%,Lesson learnt, it came back and bit my arse.

author: ocset
author_rank: Super Contributor
timestamp: August 26, 2018, 11:51:19 pm
content: thanks, you are very conscientious...many would say stuff the customer if they short the output, then they get what they deserve.
are the pins on DIN-5 connectors in Soviet shematics, numbered from insideOrOut? - Page 1
Forum section: electronics / beginners

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: January 20, 2021, 04:48:47 pm
content: I'm can't figure out how the pins on soviet radio schematics, on DIN-5/DIN-3 connectors, are numbered, looking from the inside/female end or from the outside/male end?specifically, it's a VEF-stereo 101 schematic I'm looking at...from my experience, it has been looking from the outside, but I'm not sure, I may be mistaken.what do you think?:[ Attachment Invalid Or Does Not Exist ]

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 20, 2021, 05:56:43 pm
content: See :https://cdn.sparkfun.com/r/600-600/assets/learn_tutorials/4/0/8/midi-labeled.png

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 20, 2021, 05:57:15 pm
content: Quote from: ELS122 on January 20, 2021, 05:55:30 pmI was too hasty - I should have said number starts from 1 and proceeds clockwise(ish)Please see my other reply and/orhttps://cdn.sparkfun.com/r/600-600/assets/learn_tutorials/4/0/8/midi-labeled.png

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 20, 2021, 10:42:04 pm
content: The Soviet connectors always had numbers with pin numbers written on them.If your question is still relevant, I will find one of them and take a photo.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: January 21, 2021, 12:56:32 am
content: Quote from: S. Petrukhin on January 20, 2021, 10:42:04 pmThat was always my experience, too, in the UK. Repairing a 5-pin DIN to 5-pin DIN audio cable was the first soldering job I ever did
Are there any dedicated 5x7 LED matrix decoders, with normal pricing? - Page 1
Forum section: electronics / beginners

author: LinuxHata
author_rank: Frequent Contributor
timestamp: July 15, 2023, 09:51:53 am
content: Hello.I want some dedicated, 5x7 led matrix decoder, which will take serial or paralel data at input and do all the decoding, refreshing etc. stuff by itself. So far, I found only two of these types to exist - MAX6952, MAX6953. Both are VERY expensive (like $35 and over), and while I do have couple of them, I'm still in search of similar one.I'm looking into two directions:1. The "dumb" decoder, which takes serial data at input and just turns on the appropriate LED. Something like MAX7219, HT16K33 and similar, but dedicated for 5x7 matrix. So far, found only one, which is rougly close - TM1623, which can do 11x7, two digits at once. However, I'm looking for solution, where I will "waste" less pins - say with HT16K33, which can do 24x8, I will have to waste 32 pixels, because of different hardware arrangement.2. Something "smart", like above mentioned MAX6952/53, but with more reasonable price.Any ideas?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: July 15, 2023, 10:40:35 am
content: Not looked at them in detail but Lumissil do a number of I2C matrix drivers which may be suitable.A small MCU (e.g. PIC8) is also another cheap and very flexible option.

author: Psi
author_rank: Super Contributor
timestamp: July 15, 2023, 10:46:56 am
content: Have a look at this, might not be exactly what you're after but it's pretty cool, used it once in a product.https://www.digikey.co.nz/en/products/detail/stmicroelectronics/STLED524/4928003It's a full display driver for a 5x24 LED matrix (or multiple 5x7 LED matrix connected together)SPI control for set pixel/scroll frame buffer etc..2 pattern memoriesIncludes boost converter so it can drive white leds from 3.3V256 brightness steps per pixel$2.75 @ 100pcsDownside is 56-CSP (3.4x3.0) package with 0.4mm pitch, which can be a bit annoying for PCB design, I cant recall if you actually NEED to have burry/blind vias or not. I think you do need via-in-pad.I've seen it used with a matrix of single 0402 leds on a flex PCB to create a nice text display once you add a diffuser on top.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: July 15, 2023, 02:19:33 pm
content: Thanks no, my soldering skills are limited to TSSOP and 0805, at best
Are there any genuine small LCD monitor? - Page 1
Forum section: electronics / beginners

author: sam1275
author_rank: Frequent Contributor
timestamp: November 25, 2014, 02:10:49 pm
content: I'm looking for a small LCD monitor, but all I found are either no-brand Chinese rubbish, or extreme expensive special purpose ones. Can anyone help me to find a genuine one with reasonable price? Here's what I want:Size: 3 inch to 10 inchResolution: equal or higher than 640*480D-Sub (15pin) standard inputThank you very much!

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 25, 2014, 02:16:55 pm
content: Look for stuff designed for in-car use.I think Adafriut do some small displays

author: sam1275
author_rank: Frequent Contributor
timestamp: November 25, 2014, 02:32:25 pm
content: Quote from: mikeselectricstuff on November 25, 2014, 02:16:55 pmThank you very much! So all the products on adafruit must be genuine, not low-quality or Chinese products, right? Just want to double check.

author: Dago
author_rank: Frequent Contributor
timestamp: November 25, 2014, 02:53:24 pm
content: I think you're going to have trouble finding pretty much anything not made in China, especially cheap... I'm pretty sure you can find a decent one made in China though.

author: sam1275
author_rank: Frequent Contributor
timestamp: November 25, 2014, 02:57:32 pm
content: Quote from: Dago on November 25, 2014, 02:53:24 pmThank you for reply, but I think "Made in China" is different from "Chinese product", "made in China" is obvious acceptable and many quality consumer product will also made in China, but "Chinese product" is a whole another story.

author: amyk
author_rank: Super Contributor
timestamp: November 25, 2014, 03:56:38 pm
content: They're all about the same, brand doesn't really matter. LCD tech is a commodity now. The only real point of failure are the electrolytic caps but even those aren't normally subject to high stresses in small units.

author: sam1275
author_rank: Frequent Contributor
timestamp: November 25, 2014, 04:23:51 pm
content: Quote from: amyk on November 25, 2014, 03:56:38 pmI'm sorry, but I think I cannot agree with you. Just a simple example, do you think Nokia's cellphones will have the same quality as the Chinese fake/replica ones? Even the genuine Chinese brands are way worse than international big brands'.

author: free_electron
author_rank: Super Contributor
timestamp: November 25, 2014, 04:49:17 pm
content: face it : all panels are made in china now. even the big sony and samsung onesi have used Miracle lcd monitors. they are 800x600 and available from 7 inch on upwards and are true VGA.Miracle buys these from an oem that makes these panels in large quantity for things like cash registers , POS systems and other industrial apps.they run of a 12 volt supply and stay completely cold.

author: sam1275
author_rank: Frequent Contributor
timestamp: November 25, 2014, 05:27:11 pm
content: Thank you!
Are there any good quality image sensors with documentation? - Page 1
Forum section: electronics / beginners

author: soFPG
author_rank: Frequent Contributor
timestamp: May 16, 2020, 07:31:52 am
content: Does someone here know where to buy actual camera sensors (such as those used in a smartphone, probably not the most recent model but better than the common OV... models)?Does it even make sense to play with them (also considering the high-speed connection they probably need)? Is there good documentation?

author: Domagoj T
author_rank: Frequent Contributor
timestamp: May 16, 2020, 04:54:43 pm
content: What do you want to do with them? Why not use some off the shelf industrial machine vision thing?

author: Jwillis
author_rank: Super Contributor
timestamp: May 16, 2020, 09:31:51 pm
content: Depends what you want. Do you want a module or just the sensor. How many frames per second. Monochrome or colour. Resolution . CMOS or CCDModules fromhttps://www.arducam.com/products/Image sensors from Digikey , Mouser , ect. (example)https://www.digikey.ca/products/en/sensors-transducers/image-sensors-camera/532?k=ccd+sensor&k=&pkeyword=ccd+sensor&sv=0&pv183=327746&sf=0&FV=-8%7C532&quantity=&ColumnSort=0&page=1&pageSize=25Something cheap that your not afraid to fry.https://www.ebay.ca/sch/i.html?_odkw=cmos+image+sensor+module&_osacat=0&_from=R40&_trksid=m570.l1313&_nkw=image+sensor+module&_sacat=0Theirs also analog or digital .

author: MosherIV
author_rank: Super Contributor
timestamp: May 16, 2020, 09:42:47 pm
content: No, they are sold in such large quantaties that you need to talk directly to the manufacturers. Think about the quantity of smartphones that are made.Due to the that, the documentation is not easy to find.No, it does not make sense to play with them.You would have to build the optics (lens and correct focal distance) around the sensor.The interface to the sensor is very high speed, in the MHz SPI.It is just easier to buy pre-built modules.

author: magic
author_rank: Super Contributor
timestamp: May 17, 2020, 06:33:50 am
content: I'm under impression that these days sensors designed for mobile devices use the MIPI CSI-2 interface, conveniently available on a few Raspberry Pis.The Pis have drivers for two sensors with relatively decent specs IIRC, one from your favorite OV and one from Sony. There is a number of compatible and ready to go camera boards from many vendors, with varying lenses or M12 lens mounts, and they supposedly support all the nice functionality like manual exposure and raw. Supposedly, because I have only read about that stuff, do your own research before buying
Are there any hall current sensors with discrete(adjustable) output? - Page 1
Forum section: electronics / beginners

author: LinuxHata
author_rank: Frequent Contributor
timestamp: March 17, 2024, 04:31:05 pm
content: There are chips like ACS712, ACS724 and some others.But these provide linear output, while I'm looking for discrete output, under 1A current range.Like if current is less than 0.1A, there's no output, if current exceeds 0.1A, there's logical "1" on output.I know that by adding an opamp to above mentioned chip can do the trick, but I'm looking for a complete, single chip solution, with adjustable threshold.
Are there any ICs that I can get 5V and 8V from 3.7V? - Page 1
Forum section: electronics / beginners

author: merymery
author_rank: Contributor
timestamp: May 24, 2021, 09:41:30 am
content: Hi everyone,I have 3.7V input voltage for my DC-DC converter design. I need 5V for microcontroller, requested VCC = 8V-30V for driver. How can I get these voltages, is there any IC you can recommend?

author: mariush
author_rank: Super Contributor
timestamp: May 24, 2021, 09:57:36 am
content: You can use step-up dc-dc converters, otherwise also called boost converters.You need the chip, an inductor, and maybe a diode or two and a bunch of ceramic capacitors and resistors to configure the output voltage.Here's around 37k chips :https://www.digikey.com/en/products/filter/pmic-voltage-regulators-dc-dc-switching-regulators/739Go in Topology section and click on lines which say "Boost" to see regulators that can boost a low voltage to a higher value.Considering your microcontroller probably only consumes a few mA of current, it would probably make sense to boost your voltage to 9v or so, and then use a linear regulator (a LDO) to output 5v. The linear regulator also works as a minimum load for the step-up regulator, making it more stable, and a LDO is much cheaper and doesn't need external components (except 2 adjust resistors, if you don't use a fixed output voltage version).You're trading a bit of battery efficiency for cheaper product, less components

author: jpanhalt
author_rank: Super Contributor
timestamp: May 24, 2021, 10:03:06 am
content: A single chip for dual voltage output is unlikely. It might be better to boost to 8V, then use a linear (or other) regulator for your 5V.You mention needing the 8 volt for a "driver." Is that something that needs high current, like a mosfet, or low current like an LCD? Also getting the 30V will be harder than getting just 8V or a little more.Assuming your current needs are high, a classical boost converter may be the way to go, such as the TI TPS63060 series. If current needs are very low, you may be able to use a switched capacitor voltage doubler/quadrupler. The ICL7660 and similar is such a device:https://www.renesas.com/eu/en/www/doc/datasheet/icl7660s-a.pdf

author: merymery
author_rank: Contributor
timestamp: May 24, 2021, 12:28:33 pm
content: Thanks for your suggestions, I will drive IRF7495pbf mosfet.Would it be okay if I get 10V from 3.7V with the LTC3459 and get 5V from 10V with the LM2940?https://www.analog.com/media/en/technical-documentation/data-sheets/3459fc.pdfhttps://pdf.direnc.net/upload/lm2940-5v-datasheet.pdf

author: jpanhalt
author_rank: Super Contributor
timestamp: May 24, 2021, 12:49:36 pm
content: It's hard to say whether the LTC3459 will work in your design. That is, it will produce sufficient voltage, but its output resistance is about 500Ω (see: Rout v. Vin graph). If the mosfet isn't working near its limits, that relatively slow turn-on (20 mA max) won't matter. If it is switching rapidly and providing high power, then you may want to find a boost regulator that can provide more current.
Are there any low cost CAN FD breakout boards? - Page 1
Forum section: electronics / beginners

author: e100
author_rank: Frequent Contributor
timestamp: June 07, 2022, 06:40:44 am
content: Either with the Microchip MCP2517FD or MCP2518FD (or similar), plus a driver chip.My Google searches just give results that are many times the price of the old regular CAN 2.0 MCP2515 breakout board.Is chipageddon messing with prices or has there always been a big price gap?

author: JPortici
author_rank: Super Contributor
timestamp: June 07, 2022, 08:35:45 am
content: What abouthttps://www.mikroe.com/click/interface/can? any of these that suits you is in stock?

author: e100
author_rank: Frequent Contributor
timestamp: June 07, 2022, 08:56:21 am
content: Quote from: JPortici on June 07, 2022, 08:35:45 amThe cheapest CAN FD board is 5 times the price of a MCP2515 board.

author: JPortici
author_rank: Super Contributor
timestamp: June 07, 2022, 09:06:16 am
content: really?https://www.mikroe.com/can-fd-4-clickand if you really want the 2517FDhttps://www.mikroe.com/mcp2517fd-clickdoesn't cost much more. The click boards are truly convenient to use when you have a bunch of devoards with the click interface so i don't mind paying a little extra for the privilege of not having to design one

author: e100
author_rank: Frequent Contributor
timestamp: June 07, 2022, 09:21:56 am
content: Quote from: JPortici on June 07, 2022, 09:06:16 amThat's just the transceiver.The description implies it's a controller, but the linked datasheet is for a transceiver.
Are there any X86 tablet with minimal sensor possible? - Page 1
Forum section: electronics / beginners

author: sam1275
author_rank: Frequent Contributor
timestamp: August 02, 2016, 02:43:53 pm
content: Hi everyone, I had a samsung Q1 (no-Ultra) and I like it, I only took out the bluetooth and mic then it works as I like, but I broke the screen days ago, and I cannot find a good replacement screen(all are from China which I don't trust), so I want to buy a new UMPC/tablet, but I find all of them have tons of devices/sensors I don't want, such as cameras, GPS, 3G/4G, bluetooth, light sensor, accelerometer, magnetometer, gyro......Now I can only ask you guys for help... I need nothing more than a hand-held X86 computer with not less than 512 MB of RAM, screen not larger than 10 inch, without all those annoying sensors, are there any one on the market? Thank you!

author: NottheDan
author_rank: Frequent Contributor
timestamp: August 02, 2016, 03:52:24 pm
content: So why not just ignore the sensors or disable the drivers?

author: Cliff Matthews
author_rank: Unknown
timestamp: August 05, 2016, 12:01:18 pm
content: Features sell. Why would anyone make something that didn't sell? Generally:X86 technology is generic and requires support I/O chips, which typically means more power and space used (less portable).ARM cpu technology is typically system-on-chip (ARM corp makes no silicon, licensee's fabricate as per spec, GPU's and I/O included).X86 is CISC technology (typ. more on-die power consumption) ARM is RISC technology (typ. less power req'd).In the last few years, crafty power management and 14/22nm chip technology has allowed X86 Atom CPU's to compete in low power markets, but making a system-on-chip (CPU, I/O, GPU, etc..) to suite everyone has proven difficult if not impossible.

author: wraper
author_rank: Unknown
timestamp: August 05, 2016, 12:52:15 pm
content: Maybe you should buy tinfoil hat instead?
Are there male headers that fit in a 16 pin, flat slots IC socket? - Page 1
Forum section: electronics / beginners

author: Back2Volts
author_rank: Unknown
timestamp: September 25, 2022, 12:55:00 am
content: I guess the tittle says it all. Regular flat slot pins socket.

author: TimFox
author_rank: Super Contributor
timestamp: September 25, 2022, 01:37:59 am
content: Like these?https://www.peconnectors.com/machined-pin-headers-.100/hws3282/There are also ones designed to connect to 0.050" ribbon cables.

author: Back2Volts
author_rank: Unknown
timestamp: September 25, 2022, 02:07:32 am
content: Thank you. Those have machined pins. I am talking flat slots, so the header would have flat pins like a PDIP.

author: Warpspeed
author_rank: Contributor
timestamp: September 25, 2022, 02:34:37 am
content: They do exist but are pretty rare.You might have more luck getting an insulation displacement plug for ribbon cable to DIP socket, and removing the top.

author: Back2Volts
author_rank: Unknown
timestamp: September 25, 2022, 12:04:50 pm
content: That ribbon connector at .3" is exactly what I need. It will do great.Thank you to all
Are there transportable Lion battey-packs for a home solar system? - Page 1
Forum section: electronics / beginners

author: max5star
author_rank: Newbie
timestamp: November 05, 2018, 10:56:19 pm
content: I'm working on this project about renewable energy and I'm tying to figure out if its possible to have a battery pack that can be easily disconnected, moved, and reconnected from one solar panel system to another, if given the right base mounts. or are they too complex/risky to easily remove. I'm prety new to this. Anyone have an idea?

author: brybot
author_rank: Contributor
timestamp: November 06, 2018, 01:42:03 am
content: What are your power requirements?The Tesla power wall is a little bit large to transport, but I think the original concept came from used Tesla car batteries.https://www.tesla.com/powerwallThere's no reason you can't move the battery packs around, but you may have to disconnect power or turn off your inverter first, depending on the setup. That is to say, all of what you are suggesting is possible. But your particular requirements, which are unknown, will determine how complicated that system would be.Your biggest risk with moving li-ion is overheating or puncturing. So as long as you safe guard against that, you should be ok.

author: digsys
author_rank: Unknown
timestamp: November 06, 2018, 02:13:59 am
content: These boys do all sorts of "dangerous" builds, and most are still alive :-) (j/k)https://secondlifestorage.comHandled with respect, and in correct conditions, you can do pretty much what you like ...- It's a very helpful site for this specific field
Are thermistors stable in their error? - Page 1
Forum section: electronics / beginners

author: NaxFM
author_rank: Regular Contributor
timestamp: May 20, 2022, 06:25:04 am
content: I need a temperature sensor for a thermal chamber and it needs to be cheap, both the sensor and the circuitry.However the typical 2 degrees of accuracy for a thermistor is just too much, I need something with an accuracy of maximum +-1 Degree C, better if a little less.I could use a thermistor if I knew the error was stable over time, so for example if the real temperature is 25C and the thermistor always reads 27C it wouldn't be a problem, all i have to do is to calibrate the reading. But it needs to read 27C evey single time the temperature is 25C, even after days.I can't find this information anywhere, both for thermistor and for integrated temperature sensors, i can easily find the specified accuracy but not the stability.Do you have any info about this? I just need to know if a thermistor is stable over time.

author: nfmax
author_rank: Super Contributor
timestamp: May 20, 2022, 09:02:59 am
content: Thermistor stability was discussed, along with other interesting topics, in the threadhttps://www.eevblog.com/forum/metrology/measuring-mk-with-small-rtds/Thermistors can haveexcellenttemperature stability:QuoteThis comes from a document published by the BIPM, addressing the suitability of thermistors for metrological applications:https://www.bipm.org/utils/common/pdf/ITS-90/Guide-SecTh-Thermistor-Thermometry.pdf. Another publication I have here reports a test with a 'super stable' epoxy-coated bead thermistor. It showed no detectable drift in resistance/temperature characteristic in the range 0˚C to 60˚C over a 9-month period, at a 1mK uncertainty level:https://www.eevblog.com/forum/metrology/measuring-mk-with-small-rtds/?action=dlattach;attach=1209374. The specific thermistor used in this test was an MEAS 46016, made by TE connectivity:https://www.te.com/usa-en/product-11029033-00.htmlI hope this information is of use!

author: NaxFM
author_rank: Regular Contributor
timestamp: May 20, 2022, 12:47:40 pm
content: Quote from: nfmax on May 20, 2022, 09:02:59 amTHANK YOU! This is all I needed to know and more!In the end it seems that even the most common thermistors you can buy for few cents are far more stable that what I need.Really, I can't thank you enough. I almost had given up on thermistors for my project but this is just perfect!
Are these 100V electrloytics marginally rated? - Page 1
Forum section: electronics / beginners

author: Chris Wilson
author_rank: Super Contributor
timestamp: November 20, 2014, 05:52:33 pm
content: The guy who devised this circuit knows more than I ever will, yet to me the 100V , 10,000uF electrolytics seem marginally rated, voltage wise. I have genuine Nippon Chemico (or whatever they are called, they are not to hand right now), but 100V seems a bit iffy. Am I worrying needlessly please? Thanks. Also, to get the 14V AC he recommends winding a few turns of 1.5 mm enamelled wire on the outside of the toroidal transformer, as the one specced does not have a 14V secondary. Should I then wrap the winding with some sort of tape? What sort please? Thanks.

author: SeanB
author_rank: Super Contributor
timestamp: November 20, 2014, 06:01:55 pm
content: Very close to the full voltage rating, but will work. If you are worried use 160V rated caps, though you will need to have a few in parallel as you will likely only get 4700uF in 160V rating.As to the 14V winding, you just wind it over the existing toroid, and yes you should use some mylar or kapton tape to provide extra protection to the winding so it does not get damaged. Do not use regular insulation tape as it will go sticky and peel off in a few years.

author: Chris Wilson
author_rank: Super Contributor
timestamp: November 20, 2014, 11:03:52 pm
content: My hero, Sean always seems to come to lost soul's rescueThanks, if they get warm or give issues I'll re-examine things. Apparently the creator's amp has run fine with the exact same caps for years. Call me paranoid, been called far worse! Thanks again.

author: SeanB
author_rank: Super Contributor
timestamp: November 21, 2014, 04:03:25 pm
content: Just take the new caps and reform them for an hour or two, using a series resistor of around 10K 10W to charge them to 120VDC. This will reform them, and should be safe enough as they likely were originally formed to 130V in production. Best though is to not operate it at full power setting for long periods in receive, especially at high mains voltage, or to just order 160V or 200V capacitors. I have some 4700uF 450V capacitors NOS here that are not in use, I got them in a dumpster, and am looking to add them to a PSU as extra hold up time.
Are these capacitors dead? - Page 1
Forum section: electronics / beginners

author: Legion
author_rank: Frequent Contributor
timestamp: February 08, 2014, 09:23:01 pm
content: I went to a local electronics surplus store today and picked up a random assortment of components. Some of the capacitors I bought don't seem to work and I can't figure out how to read their markings. Google searches for the markings didn't yield any useful results.I bought 4 ceramic caps with markings reading WDC 68J N470. I can't get a capacitance reading out of any of the 4 with my DMM. Same thing with another set of 4 ceramic caps, these one's marked 5% 47 N750. All the other caps I bought read fine on the DMM. I'd expect the odd component to be bad, but the fact that all 4 don't seem to work in both cases makes me wonder if I'm doing something wrong.So is there something else I should try? Should I toss them? Any idea what the capacitances of these are from the markings?

author: mariush
author_rank: Super Contributor
timestamp: February 08, 2014, 09:30:48 pm
content: Your multimeter is probably not sensitive enough to measure such low capacitance or maybe the capacitors are faulty (open)If they're really capacitors, one of the numbers is capacitance, the other is voltage. Could be 68pF 470v and 47pF 750v rated capacitors. But 470v and 750v are really big numbers, kind of hard to believe it.It could be that the numbers are written using the convention that the last digit represents the number of zeroes so then 470 becomes 47 x 10^0 = 47x1 = 47 and 750 becomes 75 x 10^0 = 75v.... but it's just a guess.The J says tolerance +/-5% .. seehttp://wiki.xtronics.com/index.php/Capacitor_Codes, table 2.edited to say picoFarads (pF), not nanoFarads (nF).

author: Monkeh
author_rank: Super Contributor
timestamp: February 08, 2014, 09:34:07 pm
content: N470 and N750 could be temperature coefficients.Most likely your meter isn't sensitive enough.

author: PA0PBZ
author_rank: Super Contributor
timestamp: February 08, 2014, 09:36:19 pm
content: I think these are 68 and 47 pF capacitors. The number after the N represents a Negative temperature coefficient, although 470 is a bit weird, it's normally something like 500, 750 and such.

author: Monkeh
author_rank: Super Contributor
timestamp: February 08, 2014, 09:37:12 pm
content: Quote from: PA0PBZ on February 08, 2014, 09:36:19 pm470 is normal, just like 47.

author: Legion
author_rank: Frequent Contributor
timestamp: February 08, 2014, 10:14:33 pm
content: Yeah, they might be below my meter's sensitivity if they're 47pf and 68pf. The lowest mine goes is 100pF. It's an Agilent U1242B.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: February 08, 2014, 10:24:01 pm
content: Quote from: Monkeh on February 08, 2014, 09:34:07 pmTheres a chart on wikipedia that says they are temperature coefficients.Also the J is 5% tollerance rating.It doesnt mention anything about WDC but thats probably the series or manufacturer .http://en.wikipedia.org/wiki/Ceramic_capacitorClass 1-ceramic capacitorsCeramic names, temperature coefficients ?, ? tolerances and letter codes for ?referring to IEC/EN 60384-8/21 and EIA-RS-198
Are these capacitors, which value? - Page 1
Forum section: electronics / beginners

author: Ineedtolearn
author_rank: Newbie
timestamp: May 07, 2022, 06:29:20 pm
content: If these are capacitors, what would be the value of them?

author: RoGeorge
author_rank: Super Contributor
timestamp: May 07, 2022, 06:30:36 pm
content: The blue one is 0.1uF (100nF).

author: Ineedtolearn
author_rank: Newbie
timestamp: May 07, 2022, 06:32:17 pm
content: Yes! 0,1 uF is what I was looking forThank you.

author: themadhippy
author_rank: Super Contributor
timestamp: May 07, 2022, 06:34:35 pm
content: hard to tell from the way the lights hitting it but possible 270000pf for the right one

author: strawberry
author_rank: Super Contributor
timestamp: May 07, 2022, 07:12:29 pm
content: colorful 4.7nF 5%

author: Benta
author_rank: Super Contributor
timestamp: May 07, 2022, 09:38:18 pm
content: The right one looks more like a thermistor, whether it's NTC or PTC is impossible to say (try connecting a DMM and measure the resistance).Should it be a cap, it's in the pF range. Certainly not nF. But the colour coding speaks against it.
Are these capacitors? - Page 1
Forum section: electronics / beginners

author: dentaku
author_rank: Frequent Contributor
timestamp: May 31, 2015, 03:05:39 pm
content: I was looking at an old Panasonic/General Instruments VideoCipher satellite box and it's full of Matsushita parts of course.One strange thing is what looks like black caps labled K180 31 but the PCB shows them as D instead of C and my component tester reads them all as 1000pF caps.The symbol on the board is also something I don't think I've ever seen before.What are these?

author: mikerj
author_rank: Super Contributor
timestamp: May 31, 2015, 03:34:28 pm
content: Probably an 180v MOV (Metal Oxide Varistor), a voltage sensitive resistor used for suppressing transient voltages.

author: Deathwish
author_rank: Unknown
timestamp: May 31, 2015, 03:40:21 pm
content: http://www.allelectronics.com/make-a-store/item/mov-180c/18v-mov-cut-leads/1.html

author: dentaku
author_rank: Frequent Contributor
timestamp: May 31, 2015, 03:42:10 pm
content: Quote from: mikerj on May 31, 2015, 03:34:28 pmI just looked at another board from the same device and there was another one but it's a bigger 240. This one is labled with the Z symbol so it looks like they ARE 18 and 24V MOVs
Are these fets + drivers ? - Page 1
Forum section: electronics / beginners

author: lukasz.kostka
author_rank: Contributor
timestamp: April 14, 2020, 02:47:46 pm
content: Hi.I am a beginner in elevtronics and I don't know if below ICs are a fet drivers + fets in one package ? I want to drive PC fans with ~25kHz PWM from micro. High side since I need to read out tacho pin. Yes I need at least 1A for some more powerfull fans / water pumps.FDC6324LITS716G