hybridfree/eevblog-posts huggingface dataset:
[RELEASE] ElectronicsDB - Software for Managing a Personal Component Collection - Page 1
Forum section: electronics / projects

author: Alemarius Nexus
author_rank: Newbie
timestamp: November 09, 2021, 04:11:55 pm
content: Hey,I hope this is the right forum for this. I didn't see any other place where this might fit.A while ago, I have released the first actual (very much beta) version of my free and open-source program ElectronicsDB. You can find it along with more info on GitHub, where you can also download binaries for Windows and Linux:https://github.com/alemariusnexus/electronicsdbIt's a program for managing a personal collection of electronics components, and allows e.g. searching for components with specific properties and where you can find them (e.g. which component drawer). Perhaps a screenshot describes it best:I originally created this years ago as a quick-and-dirty tool for my own collection, but have recently spent a few weeks modernizing it quite a lot, and actually creating release binaries. It's still very much designed for my own needs and a bit buggy, but I thought it might be useful to some others as well. I wanted something a bit more sophisticated and specialized than an Excel sheet, but still relatively simple to use and flexible (data is stored in an SQL database, so you can execute custom SQL code on your collection). And at the time, I didn't find any existing software that I liked, so I just wrote it myself.As you can see from the screenshot (categorizing a transistor as "plain", doh), my background is in computer science and not electronics, so my predefined part categories may not be ideal, but you can always create your own.Let me know what you think.

author: knapik
author_rank: Regular Contributor
timestamp: November 10, 2021, 01:48:37 am
content: I'll have to check this out, thanks!
[Review request] Just another IoT device - Page 1
Forum section: electronics / projects

author: rasplyvajecca
author_rank: Newbie
timestamp: May 15, 2025, 02:14:10 pm
content: Hey!First time posting here after lurking for a long time.I'm not an EE but I'm interested in electronics and closely working with it.What I'm working on here is an exercise in PCB design and the target is to create an Internet of Things device that is at least somewhat challenging to implement.The v5.0.0 revision is the latest after having verified earlier functionality by creating separate modules for the BMS, MCU and the network modem.As I want to also become a better designer, I would not only like to hear your critique on the technical aspect but also on the aesthetic aspect.When you're providing critique on the schematic, you could imagine yourself as the guy who does the layout for example.For component selection, I tried to provide information on my wishes (e.g., voltage ratings for assumed class II capacitors to mitigate DC bias effects) as if I were a person responsible for only the schematic design and I hope that shows clearly.I haven't manufactured this revision yet so there are lots of test points, 0 ohm termination resistor placeholders and such.Basically what I'm asking from you is to look at the schematic and say if something looks wrong or if something can be improved.I'm not a native English speaker, so I'm sorry for my bad English.Thank you in advance!

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: May 16, 2025, 06:05:43 pm
content: Have you printed and assembled a prototype yet?

author: rasplyvajecca
author_rank: Newbie
timestamp: May 16, 2025, 06:12:19 pm
content: Quote from: ahsrabrifat on May 16, 2025, 06:05:43 pmI haven't had this revision manufactured yet.The previous revision was missing the BMS, the IO expander, the modem and the humidity sensor.

author: rasplyvajecca
author_rank: Newbie
timestamp: May 19, 2025, 04:54:12 pm
content: Here's an updated version.Heres a small changelist from the top of my head:- The open-drain output of the IO expander was floating so I added a pull-up to it.- Added battery detection circuit because that functionality could be hard to implement with just the battery monitor (battery could be seen as not connected if the battery monitor doesn't respond to I2C commands as its power would be missing).- Added a table of contents on the front page.- Reworked the power FET network and the GPIO control for the modem.- Added an initial version of a butterworth bandpass filter for the PCB antenna line.
[Review Request] STM32F7 Drone Flight Controller - Page 1
Forum section: electronics / projects

author: MaxxBot
author_rank: Newbie
timestamp: April 17, 2025, 03:00:25 am
content: This is an STM32F7 based drone controller design, the purpose of this project is to create custom hardware and firmware rather than be the ideal drone controller, so the fact that it's big and such isn't an issue because the drone will be built around the controller rather than vice versa. This is also why it has multiple different options as far as receiver inputs (PWM or SBUS) and outputs, (5V PWM, 3.3V PWM, DShot) dual IMUs, and a connector for adding more sensors via I2C. Basically this platform is meant for experimentation with custom firmware, if in the future I want a smaller controller with a subset of this functionality then I would do a new design. I have used the silkscreen animal designs on another PCB so I know that the turn out fine.Layer Stackup:Top - 3.3V/RoutingL2 - GroundL3 - 5V/RoutingL4 - GroundL5 - 3.3V/RoutingL6 - Ground
[Schematic Review Request] STM32WB Bluetooth Dev Board - Page 1
Forum section: electronics / projects

author: HasanSyr
author_rank: Contributor
timestamp: August 21, 2024, 10:29:06 pm
content: SMPS and XTAL might look odd but they are done according to the datasheets and application notes.

author: vad
author_rank: Frequent Contributor
timestamp: August 22, 2024, 06:55:12 pm
content: What is the PCB stack-up?
(semi) fast line driver, capable of 50mA drive? - Page 1
Forum section: electronics / projects

author: jmole
author_rank: Regular Contributor
timestamp: January 07, 2014, 10:00:26 pm
content: Looking for a logic buffer capable of 50mA drive and speeds of 20MHz+The more channels, the better.Anyone got some parts to recommend?

author: Jon86
author_rank: Frequent Contributor
timestamp: January 07, 2014, 10:07:25 pm
content: http://www.ti.com/lsds/ti/logic/non-inverting-buffer-driver-products.page#p854max=25(@5V);28 (@6V);35 (@5V);50 (@5V);50;60 (@5V);70 (@5V);75 (@5V);90 (@5V);75;100 (@2.5V);100 (@3.3V);100 (@5V);110 (@5V)&p1994max=- /64;-80/188;-32/64EDIT: The link didn't paste properly, but you get the idea. TI have a ton of parts that match your specification, which package would you be after?

author: jmole
author_rank: Regular Contributor
timestamp: January 07, 2014, 10:23:28 pm
content: doh, should have known to do a parametric search at TI. They seem to have one of the better collections of nice logic chips.This one here, looks quite suitable:http://www.ti.com/lit/ds/symlink/sn64bct25244.pdf

author: Jon86
author_rank: Frequent Contributor
timestamp: January 07, 2014, 10:33:05 pm
content: Quote from: jmole on January 07, 2014, 10:23:28 pmTI are always my first choice if I just need some generic kind of chip. One of the best websites too in my opinion.
[Sharing] Ameba RTL8722DM LVGL Widgets Demo - Page 1
Forum section: electronics / projects

author: dakamaster
author_rank: Newbie
timestamp: May 14, 2021, 01:18:14 pm
content: Hi fellows, I am using RTL8722 to run the LVGL (Light and Versatile Graphic Interface) library. 🎉LVGL is a GUI library for embedded systems with easy-to-use graphical elements, beautiful visual effects, and a low memory footprint.There are available live domes existing on their official website (https://lvgl.io/demos), you can try different demos by using the web-embedded GUI to directly interact with all the widgets. Currently, the official website is supporting three demonstrations, which are the:- Music Player Demo- Printer Demo- Widgets DemoMy reference websites are:- LVGL Official Website:https://lvgl.io/,and- Ameba Offical Website: Realtek IoT/Wi-Fi MCU Solutions for more information!!Hope you like my demo video. Please feel free to leave a message here if you wish to know more 😄!
[Slightly OT] Webinar on 28 Gbps electrical testing - Page 1
Forum section: electronics / projects

author: chscholz
author_rank: Regular Contributor
timestamp: May 12, 2012, 03:10:06 am
content: Ok, this is probably a bit beyond the usual bitrate in this forum.Last Wed. I did a webinar related to compliance testing of 28 Gbps electrical signals (more precisely testing of CEI-28G-VSR signals). Listen in if you don't have anything better to do.https://www1.gotomeeting.com/register/379427801[full disclaimer,1) you will need to register2) works only on relatively recent MS Windows machines, ping me off line if you have the urgeto listen in on a non-compatible platform]Chris

author: PeterG
author_rank: Frequent Contributor
timestamp: May 12, 2012, 03:40:46 am
content: It tells me "Your Internet browser is currently set to block cookies. In order to interact with this Web site, you will need to adjust your browser's privacy settings to accept cookies." which is wrong.Probably limited to IE ?Regards

author: electroguy
author_rank: Regular Contributor
timestamp: May 15, 2012, 12:01:52 am
content: Quote from: PeterG on May 12, 2012, 03:40:46 amme too. dodgy website...
(UK) A-Level Extended Project - Page 1
Forum section: electronics / projects

author: jbirtles
author_rank: Newbie
timestamp: June 20, 2014, 09:04:56 am
content: Hi guys, I have been watching the show for a while but this is my first post.I'm doing an EPQ at a-level where I get to choose what project I would like to do be it an essay, dance, or artifact.My project title is "Develop and Produce an educational kit for building a hybrid between a multimeter and a calculator". What I am really here for is help in compiling a list of sources of information. I'm not asking anyone by any means to do my project for me or do any of the research for me, I am however asking If any one knows of any good sources for learning about measuring voltages.I know a little about ADCs however sources on these would be great.I have found a bunch of resources myself however due to the nature of hobbyist electronics, these are mostly blog posts and wikis. This means in order to make these sources more credible, I need to have someone almost vet them for me, or at least recommend it as a resource.Thank you for all and any help with this, you can follow my project if you so desire on my blog -http://jamesepq.weebly.com/.P.S. You can ignore some of the bullshit I have to write to get a decent grade on my blog.

author: bance
author_rank: Contributor
timestamp: June 21, 2014, 08:30:42 am
content: Perhaps not exactly what you're after, but have a read anyway I'm sure there'll be something of interest.http://www.intersil.com/content/dam/Intersil/documents/icl7/icl7106-07.pdfhttp://www.intersil.com/content/dam/Intersil/documents/an05/an052.pdfYou might check out the other App notes listed at the bottom of the second link also.HTH Steve.

author: Rerouter
author_rank: Super Contributor
timestamp: June 21, 2014, 08:36:52 am
content: auto-ranging for a multimeter input is also fun, the ones that use an analog switch ic to change the divider with a clamping diode is one of my favorite approaches,equally if your combining the functions, think about being able to use the measured value in basic calcs, i remeber dave doing a video about one of these products which did exactly that,

author: daveshah
author_rank: Unknown
timestamp: June 21, 2014, 10:09:25 am
content: Bit outdated but might still be useful - Art of Electronics (2nd edition) has a section on A/D converters around page 621. There will probably be a copy at your school.

author: jbirtles
author_rank: Newbie
timestamp: July 04, 2014, 08:40:17 am
content: Thanks for the links/book suggestion. I have taken a look in my college library and they indeed did have The Art of Electronics. I also got out Electronics Explained (M.W. Brimicombe), and Analogue Electronics (J.C. Morris).If there are any other books anyone could recommend me that would be great. I am doing electronics in college and have been playing around with electronics for a few years but I haven't really got into anything more complicated than following an arduino tutorial until recently so any book from beginner to advanced, I'll read it eventually.Thanks again.
[VIDEO] DIY Reflow overn using the ControLeo2 - Page 1
Forum section: electronics / projects

author: ajcrm125
author_rank: Contributor
timestamp: March 18, 2016, 12:27:31 pm
content: Had to build a reflow oven for the lab so I figured I would document the build. It was targeted towards my arcade collecting buddies who aren't as familiar with PCB fabrication as the folks on here so forgive the basic jargon.All-in-all I'd say it went pretty smoothly.Enjoy!

author: timgiles
author_rank: Regular Contributor
timestamp: May 03, 2016, 09:33:09 am
content: Thanks for that, I used your video to help plan my build.

author: koalafan
author_rank: Newbie
timestamp: May 05, 2016, 05:10:58 am
content: So good..i will try...

author: mij59
author_rank: Frequent Contributor
timestamp: May 05, 2016, 05:57:32 am
content: Very nice build, but why did you tape the ventilation slots in the bottom of the unit ?
*.TRC file visualizer from Siglent SSA spectrum analyser - Page 1
Forum section: electronics / projects

author: matib12
author_rank: Newbie
timestamp: September 26, 2016, 03:38:54 pm
content: I want to share my script for visualization of *.TRC files. It is written in Matlab and it requires Matlab2013r environment to run.https://github.com/matib12/SiglentTRCvisualizer
*Paid work within* Reverse engineer a plug and circuit manufacturing design.  - Page 1
Forum section: electronics / projects

author: Damonlandsdown
author_rank: Newbie
timestamp: October 16, 2016, 10:52:54 am
content: Hey guys!New to the forum here, i follow dave and i thought this would be a great place to get helpI'm currently low-scale making ignition systems for a certain set of internal combustion motors using modern CDI tech.Everything is all working and beautiful so i dont need help there, however to push my product further i want to manufacture the small circuit board and have a suitable electrical plug for the harness.Ideally what i want to do is make a fool proof plug and play setup, currently it is a wire in harness. So the plug obviously needs to connect to an oem connection.First up, the circuit board. At the moment the exact details and such are on a need to know basis, only so the product is kept secretive.I want a through hold pcb design made up (or assistance in doing so) that i can give to a manufacturer and have them make x amount of the board.Perhaps some people here could chip in some advice on the circuit, maybe i could go with SMD. Its only two resistors and an npn transistor.The second part is the plug,Essentially these engines have a module that controls the factory ignition coils and its called an igniter.All of my wiring for my looms goes to these igniters, and the plug i need is not the connector that's part of the existing harness, it actually needs to be the female version- the same as the igniter so my wiring can plug up to the factory harness.Any help is much appreciated! If anyone can point me in the right direction let me know, i can offer payment for any work done that successfully reaches my requirementsThanks guys!I have attached a photo of the car side plug, the second photo is of the igniter. Essentially i need a plug that goes right into the plug/s of the first photo. The 12 pin is the one i neef mainly, the 4 pin I've stumbled across before.
0.01mm Accuracy 3D Scanner - Page 1
Forum section: electronics / projects

author: jhoffman
author_rank: Contributor
timestamp: August 22, 2023, 04:15:42 am
content: SEAL- The World's First0.01mm AccuracyConsumer 3D Scanner.I suspect it uses a MEMS accelerometer.I can see lots of applications in what relates to this forum site.https://store.3dmakerpro.com/pages/seal-pre-launchI stumbled into this by accident (information landed in my Facebook feed) and thought I should share it here after checking that there were no similar posts.Good? Bad? Dunno !!! Don't shoot the messenger !!!Imagine the possibilities of this 3D scanner combined with a 3D printer.In the future I see 3D scanners like this being used by PCB/EDA environments to automatically create component libraries.

author: hickorystick
author_rank: Newbie
timestamp: August 24, 2023, 03:26:28 pm
content: nothing but vaporware at the moment
0.05" female pin-header to 0.1" male pin-header cable - Page 1
Forum section: electronics / projects

author: SpacedCowboy
author_rank: Frequent Contributor
timestamp: August 01, 2023, 04:42:16 pm
content: Anyone know where I can get hold of something like this ?NXP, in their wisdom, decided to nix the 0.1" headers for the "console UART" on the 1176 EVK "B" board, and replace them with 0.05" ones instead. That makes it something of a challenge to link up your bog-standard USB<->UART converter...I can always buysome of theseand solder some wires, but if there's a better option (my google-fu seems to have deserted me), I'm all ears...Ta

author: PeteH
author_rank: Unknown
timestamp: August 01, 2023, 04:52:17 pm
content: You can use a pitch adaptor if you wanted to use a PCB for this, and solder the right mating parts on either side, or make your own:http://www.proto-advantage.com/store/product_info.php?products_id=3800054Various adaptors sold through digikey too.

author: SpacedCowboy
author_rank: Frequent Contributor
timestamp: August 01, 2023, 07:18:39 pm
content: I think for the time being, I'll use a pair of thosegrippersyou get on the end of logic-analyser cables...
0.1 inch 2.54mm ribbon cable - Page 1
Forum section: electronics / projects

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 08, 2019, 05:36:55 am
content: Anybody know of a cheap'n-cheerful source of 0.1 inch (2.54mm) pitch ribbon cable? The gross consumer stuff used in mass-market gadgets. A guy over on the audio forum is working on his little Synth box and wants to extend the 18-conductor internal cable. I told him he would be better off just using 18 lengths of hookup wire vs. trying to find 0.1 pitch ribbon cable.https://www.gearslutz.com/board/geekslutz-forum/1263984-boss-dr-110-ribbon-cable.html

author: CJay
author_rank: Super Contributor
timestamp: May 08, 2019, 12:39:52 pm
content: That stuff is useful but it has a bad habit of 'fraying' or breaking at the solderjoint if it's flexed too often, he'd be far better off with some kind of plug and socket arrangement, if he's worried about how the individual wires lie then he could laminate them

author: Ian.M
author_rank: Super Contributor
timestamp: May 08, 2019, 01:19:39 pm
content: Use common as dirt 0.05" pitch ribbon cable and crop short every other wire.

author: MarkF
author_rank: Super Contributor
timestamp: May 08, 2019, 01:42:17 pm
content: This looks like it but only 10 conductors.He would have to parallel two pieces to get his width.https://www.digikey.com/product-detail/en/3m/8124-10-100/3M156818-1-ND/8256334

author: mariush
author_rank: Super Contributor
timestamp: May 08, 2019, 02:06:16 pm
content: Farnell sells by the meter:https://uk.farnell.com/w/c/cable-wire-cable-assemblies/ribbon-cable-flat-cable/prl/results?pitch-spacing=2.54mm&sort=P_PRICEBiggest wire count in stock is 8 though, so may have to chop that 1m in smaller chunks.may want to look into flat flex ribbon cables categories... some have conductors thin enough to go in holes.ex:https://www.digikey.com/short/pzf9mralso worth checking cable assemblies:https://www.digikey.com/short/pzf99zplain flat flex (may need to strip end insulation, compress terminals to round-er shapes if needed) -https://www.digikey.com/short/pzf95d
0-20mA / 0-10V  voltage and current source - Page 1
Forum section: electronics / projects

author: rvalente
author_rank: Frequent Contributor
timestamp: December 18, 2019, 12:35:15 am
content: Hello mates,i'm trying to make a 20mA/10V driver (signal output from a device, to drive VFDs and other industrial equipment):Requirements.Source topology (active loop), supplied by external 24V20mA @ 2.5Vin or 10V @ 2.5Vin, user selectable. I wish was only a single jumper bridge.In voltage mode, current limited, anything from 20 to 100mA is good enoughIn current mode, drive up to 600ohms loads (12V output)Frequency up to 1KHzThe 2.5V input will come from STM32F1 DAC (12bit), using a 3V referenceI wish the opamp will run at 5V (or 3.3V), I would like to some general purpose, low drift, nothing fancy.First I tought of using a howland current with external transistor but, the opamp output should be higher than 5V to drive an NPN as sourceThem I tried to feedback the opamp from a differential current sense resistor (49.9Ohms).Using ltspice the circuit has a strange behavior (high gain, I suppose) when connected to the opamp, but not with a 2.5V signal source.I would like to learn more about analog electronics for sure.

author: Micke
author_rank: Regular Contributor
timestamp: December 18, 2019, 08:04:41 am
content: Here is some inspiration on the current generation part:http://freecircuitdiagram.com/2010/09/27/op90-4-ma-to-20-ma-current-loop-transmitter/

author: rvalente
author_rank: Frequent Contributor
timestamp: December 18, 2019, 10:45:58 am
content: I appreciate the suggestion, bur the opamp rail is 5v, the maximum voltage i could turn the transitor on would be around 4.4v or 220ohm, i need to go up to 600

author: rvalente
author_rank: Frequent Contributor
timestamp: December 19, 2019, 09:33:29 pm
content: Okay, got it to work after some reading...I wanna use also as voltage source, but with current limiting.R13 with R14 makes the feedback for voltagem control, replacing the current feedback it works fine, how to tie the two signals?Voltage subtractor in another opamp?
0-2kV switch mode 0-200mA LKB Biochrom 2103 repair - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: June 06, 2025, 09:39:35 am
content: There are many ways to make a regulated high voltage supply,this one is from 1975-76 so it contain only simple parts,I have searched many places for schematics or anything at all about this unit,not much to find, but others also asking for information,so i better share what i have foundhere is my first video about ithttps://youtu.be/TtLK2H2u6a0

author: ahsrabrifat
author_rank: Regular Contributor
timestamp: June 07, 2025, 08:04:22 pm
content: Thanks for sharing. Power supplies often require repair.
0.2W Speaker SPL at Indicated at 1W - Page 1
Forum section: electronics / projects

author: brumbarchris
author_rank: Regular Contributor
timestamp: October 28, 2020, 01:25:43 pm
content: Hello all,I am not very familiar with audio stuff, but I do need to select some speakers for one of our new products. Nothing fancy, but I am having some difficulties in comparing the speakers in terms of SPL rating.In particular, I do not understand why the SPL rating of some 0.2W speakers is indicated at 1W/1m. I mean, I understand it being at 1m, but how did they measure it at 1W? The speakers are rated at 250mW and absolute max input is indicated as 0.5W (or 0.4W).It is not a singular case like that, which I observed, I have attached 3 different datasheets (from 3 different manufacturers) which show this. Of course, a majority of other speakers I have looked at, indicate SPL at rated power. Interestingly, the CUI devices part indicates two SPL values, one at the rated 0.2W power and one at the cryptic 1W.

author: CaptDon
author_rank: Super Contributor
timestamp: November 02, 2020, 06:54:29 pm
content: If they list a 1w/1m spec it was mathematically calculated upward fromthe rated capacity or in this case just a tiny bit over 6db spl.If you have a 1w/1m spec and you want to calculate the SPL at .2wyou could roughly estimate .5w = 3db down and again .25w would beanother 3db down and the difference between .2w and .25w is probablyless than the ear can distinguish. 3db up is twice the power, 3db downis half the power, 6db is 4X the power or .25X the power depending ifyou are going up or down.
0-3.3 v pwm to 0-3.7 v what mosfet matches? - Page 1
Forum section: electronics / projects

author: Ramila
author_rank: Newbie
timestamp: September 28, 2018, 02:19:12 pm
content: I have 0-3.3v pwm from a nodemcu. I want to run a load of 2A (dc motor) at 0-3.7vWhat mosfet is perfect?

author: Siwastaja
author_rank: Super Contributor
timestamp: September 28, 2018, 02:30:29 pm
content: 1) Open up your preferred distributor (Digikey, for example)2) Look up MOSFETs3) Look at: Vds(max) = 20V. Id(max) = at least 5A.You get hundreds of possibilities. Sort for lowest price.Basically all FETs with 20Vds(max) will have low enough gate voltage requirement to turn on fully at 3.3V.You can double check this from the datasheet.Remember the freewheeling diode, DC bus capacitors, and tight layout minimizing the capacitor-diode-mosfet loop. This is super important when driving DC motors.And don't open multiple threads on the same subject.

author: Zero999
author_rank: Super Contributor
timestamp: September 28, 2018, 02:39:30 pm
content: You already asked about it here. Creating another thread will not increase the number of useful responses, only irritate people.https://www.eevblog.com/forum/projects/motor-control/

author: Ramila
author_rank: Newbie
timestamp: September 28, 2018, 04:58:10 pm
content: I'm new for this website. I'm Sorry

author: tooki
author_rank: Super Contributor
timestamp: September 28, 2018, 05:02:14 pm
content: Quote from: Ramila on September 28, 2018, 04:58:10 pmNot cross-posting is common courtesy on ANY online forum.

author: Zero999
author_rank: Super Contributor
timestamp: September 28, 2018, 08:28:36 pm
content: Quote from: Ramila on September 28, 2018, 04:58:10 pmGenuine question: why did you start another thread about the same problem? It's not something I've every done myself and am genuinely interested in why some people do.Try to look at it from someone else's perspective. You see a thread, where someone is asking a question, so reply with the best answer you can, only then you discover another thread by the same person, asking the same question, which has already been answered by someone else. How would you feel? Maybe that you've wasted your time responding, because someone else already answered the question in the other thread?Hopefully you can see why this is frustrating.Don't worry about it, I don't think people hold a grudge, just please don't do it again.

author: Zero999
author_rank: Super Contributor
timestamp: September 28, 2018, 09:58:05 pm
content: I've also made another suggestion in the other thread: see how this makes more work for you too, as now there are two threads to check, rather than one!
0-3.3V DAC amplifier to 0.5-4.5 - Page 1
Forum section: electronics / projects

author: tru3533
author_rank: Regular Contributor
timestamp: July 26, 2021, 02:59:41 pm
content: Hi,I need to make a DAC amplifierFrom my ESP32 DAC output 0-3.3V to 0.5 - 4.5V max 10mAHave 5V railNeed to be as simple as possible.Do you have an easy solution to share?

author: Kleinstein
author_rank: Super Contributor
timestamp: July 26, 2021, 03:04:44 pm
content: The 0.5 V offset can usually be handled in software. From 3.3 V to 4.5 V is tiny bit more than a gain of 1.5. This should be reasoable easy with an 1 OP non inverting OP with rail to rail out and input to ground. The choice of OP depends on the requited speed and accuracy. Candidates would be something like MCP6001 or OPA170. Plenty of choices there. Adding an offset is probably easiest at the input side: so first a divider from the DAC and a positive voltage and than a little more gain.

author: tru3533
author_rank: Regular Contributor
timestamp: July 26, 2021, 07:03:36 pm
content: Thank you so much Kleinstein!Worked out very close with current resistor settings.Only some minor software tuning.Br, Tom
0-30V 0-10A Power Supply  Project - Page 1
Forum section: electronics / projects

author: gevv
author_rank: Contributor
timestamp: December 25, 2020, 10:20:14 am
content: Hi,A laboratory power supply offers an indispensable set for both the professionaland the amateur. This power supply is short-circuit protected and infinitely variable from 0 to 30Vand from 0 to 10A.Velleman k7200 POWER SUPPLY TECHNICAL DATA- Output voltage variable from Ov to 30V.- Fine tuning over 1 V- Output current limiting device infinitely variable from 0 to 1 OA.-LED (l ight emitting diode)-indication of current limitation- Output current: 8A. continuous/1 OA. peak- Short-cicuit protected-Ripple maximum: 0.5mV RMShttps://youtu.be/6wTsgXGJ5CYVelleman k7200 PSUsource:elforum.info(fixed error in pcb drawing and re-edited pcb)

author: coromonadalix
author_rank: Super Contributor
timestamp: December 25, 2020, 01:36:58 pm
content: This design had many variants like this one (attached file) this one is a 30vdc 10 amps too.BUT if i recall it doesn't drop all the way to zero volts, you need to have an -1.2 volts supply added on the voltage potentiometer, it's inherent to the 723 design
0.4 Hz bandwidth of PID controller performence would quite danger ? - Page 1
Forum section: electronics / projects

author: ammjy
author_rank: Regular Contributor
timestamp: October 15, 2022, 08:51:18 am
content: Good day, Dear respected EEVblog seniors !I am so sorry that always only asking...If you do not mind, I would like to ask you about bandwidth of PID controller.The control object which I'm looking at right now is a large multicopter weighing about a 1 ton.And with the current PID gains, it has a 0.4 Hz bandwidth control performance from bode plot.For missiles or small UAVs, I can surely say that 0.4 Hz is insufficient and can lead to dangerous situations.But, I am not really sure because, this kind of large control object is first experience to me.How much bandwidth would be fine for this kind of large object ?As a rookie who first started job in this field, I would like to ask the opinions of the seniors.Could I possibly get some valuable advice from you ? Please.. let me know.

author: moffy
author_rank: Super Contributor
timestamp: October 15, 2022, 11:09:00 am
content: Well if 0.4Hz is around 2 second delay, with gravity 9.8m/s^2 that is 19.6m fall, saying you go from a stall in mid air, but that isn't quite what you are talking about, because it has probably to do more with the ratio of the thrust of the lift motors to inertia of the vehicle. I would guess that winds and any type of impulse disturbance could be a real issue. Depends on conditions, but anything other than perfectly still air could be an issue. Nasty.

author: ammjy
author_rank: Regular Contributor
timestamp: October 15, 2022, 12:08:30 pm
content: I deeply appreciate for your advice, Mr. Moffy.(I am so sorry, If my understand about your words are not correct, Please tell me.)Yes, right !If focusing on controller bandwidth problem about alttitude channel, affect of losing performance will be started from altitude error, so it is not a big deal I think..Because, losing performance is start of gradual increase of error in altitude channel such as tracking 9m from 10m command.But, I am still not sure what will be the result of the 0.4Hz bandwidth in attitude control including disturbance and if so how much..

author: moffy
author_rank: Super Contributor
timestamp: October 15, 2022, 12:27:53 pm
content: You have to model the disturbances and introduce them into your control loop for analysis. The device has surface area, so to model wind loadings you need the area and expected wind gust which then exerts a force. You have inertias for the model, as well as thrust, you must have had something to come up with the PID values and then you introduce maximum wind loadings as a step force/disturbance to see how the model works. You would need to do that from various angles as the loadings would vary with surface area. Sorry I can only give general advice as I have no experience with designing drones.
0.4mm BGA Routing - Page 1
Forum section: electronics / projects

author: lgbeno
author_rank: Frequent Contributor
timestamp: December 28, 2017, 03:50:10 pm
content: I'm working on a ultra small layout where I need to put via's directly in the pad of a 7ball by 7ball 0.4mm pitch BGA.I'm already well aware that the vias need to be plugged, capped and planerized but looking to see what other have been able to get from vendors.Originally I had 5mil holes (laser drilled) with 10mil pad (2.5mil annular ring). This was based on a recommendation from a colleague who did some top spec BGA stuff. I know that it is possible but limits the number of vendors and drives price.It looks like I can fit a via that is 12mil pad 7mil (2.5mil annular ring) but it gets difficult to grow much larger. Even here I need 3mil copper to copper spacing to fit a 4mil trace between them on an inner layer.One low cost vendor has told me 7mil hole 4mil annular ring is their smallest via (15mil pad)Does anyone know anyone have a typical DRC that you use for a design like this?
0.4mm BGA vias - Page 1
Forum section: electronics / projects

author: Psi
author_rank: Super Contributor
timestamp: November 18, 2015, 08:25:19 pm
content: Hi,Can anyone tell me if Ineedto use single layer microvia for 0.4mm BGA pad breakout?Or can I use a normal laser drilled via through the entire PCB (0.8mm) done as a offset via?I'm just not sure about a via through the entire board with regard to solder disappearing down the hole.The other option is a via in pad which i assume must be a microvia so the solder can only go down 1 layer into the pcbThe BGA in question is only a small one, 2.5mm and 25 ballAny help appreciated

author: cat87
author_rank: Regular Contributor
timestamp: November 19, 2015, 06:57:20 am
content: I don't know if this helps or not, but on all the PCBs with BGAs I've seen (large or small BGA packages) I have never seen vias that go through the entire PCB stack. Instead, I've only seen blind vias, that go down to an internal layer of the PCB and those were micro-vias: 0.4mm or maybe smaller. The PCBs made are for the aerospace industry, so I can not be sure if in commercial products, this practice also stands true or not.At work, we have an X-Ray machine that has a tilting table , so it's easy for me to see how far down the vias go. Unfortunately, I do not have any pictures available

author: Neilm
author_rank: Super Contributor
timestamp: November 19, 2015, 07:04:56 pm
content: Quote from: cat87 on November 19, 2015, 06:57:20 amI have seen vias going through the whole board under a BGA. It was a small one that didn't run too fast and was in a metal box for shielding, but even so I was very surprised - the 0V plane was full of holes. I have seen very small BGAs routed without many vias under them but I certainly wouldn't like to.

author: Psi
author_rank: Super Contributor
timestamp: November 19, 2015, 07:56:11 pm
content: Quote from: blueskull on November 19, 2015, 07:18:07 amCool, plugged and plated via in pad sounds like the way to go.Chip is quite new, BQ25120.Just a battery charge / management chip
0.5mm grain oriented electrical steel? - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: December 28, 2023, 09:41:39 am
content: I'm trying to figure out what material is the core in a 36w fluorescent lamp ballast... The lamination are grain oriented, but the thickness I'm measuring is 0.502mm +/- .0005mm consistently (I'm measuring in the middle so there shouldn't be any error from burrs)I can't find any standard which fits that criteria... anything I find in that thickness range is non-grain oriented, but there's clearly the splotchy grain texture, and it's sort-of in the same direction as is the rolling direction.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 28, 2023, 02:48:35 pm
content: It depends on the light conditions what one sees. To me the picture is not clearly showing individual grains. The pattern may well be corrosion depending on the surface conditions. The patter could repeat from contact to rolers or similar causing microscopic cratches.EI type cores normally don't use grain oriented material, but more isotropic matierial, at least in the plane. The grain oriented material is used for toroidal transformers and large transfromers where the core is made from several parts to that flux can follow the preferred directions. The bend around the corners in an EI core is already not working well with GO material.Even the normal material can have some texture from rolling. The GO material uses more controlled roling with different in between annealing. Especially cheap material may be in between with parial preferred directions and neither a strong grain orientation nor fully isotropic.

author: Dan123456
author_rank: Regular Contributor
timestamp: December 28, 2023, 03:18:14 pm
content: I don’t know if transformer steel is the same or not (google is telling me it is probably silicon steel) but for a lot of other steels you can polish it up then dip it in ferric chloride to see the grains.The ferric chloride eats the different alloys / components of the steel at different rates.That said, the grains of a lot of steels can be absolutely tiny so not sure if you will be able to see them well with the naked eye or notEdit: derp, you already identified it as silicon steelSorry, not sure how I missed that
0.65mm BGA and LVDS routes - Page 1
Forum section: electronics / projects

author: SpacedCowboy
author_rank: Frequent Contributor
timestamp: May 09, 2022, 05:19:51 am
content: I have a 0.65mm BGA with the layout as in the below (for the top right corner). I want to put 10 or so LVDS pairs to each side of the BGA.Now pairing up GPIOR_{P,N}_13 is easy - LVDS lines come in on the top layer and diverge to F15, G15 at the last moment. I’m not so sure, though, how to get the lines into (for example) GPIOR_{P,N}_18 at D14, D15. The ball-spacing on these parts is only 0.65mm - if it was 0.8mm I could run two traces between the balls (at 3.5mil trace/space) and right-angle them (2x45-degree) at the last moment, but only being able to put one trace between the outer balls means that’s not possible at 0.65mm.So, what’s the recommended way for using these pads as LVDS ?Do you put vias in for even the 1st/2nd row, down to a stripline LVDS pair in an inner layer ? That would be possible but push my board-depth from 6-layer to 8-layer, and going from 6->8 just about doubles the PCB price at small quantity ...Do you take the P signal straight to the first-row ball, and wiggle it a bit to compensate for the extra distance being travelled to the second-row N ball ?Do people only do these with Via-In-Pad ?Something I’m missing ?Cheers
0-70 to 4-20mA circuit with startup problems - Page 1
Forum section: electronics / projects

author: lmagalhaes
author_rank: Contributor
timestamp: May 26, 2020, 06:56:00 pm
content: Hey there,I saw a circuit online to convert a 0-10V signal to 4-20mA current signal and I adapted it to 0-70V. The problem is that sometimes, when the circuit is connected to the 24V power rail, the output of the ampops is completly wrong. Either it locks to a certain value (like 7mA, 20mA or 0mA) or it starts on an arbitrary value and then goes from there. Here's the schematic:I feel that the problem is with the TLV2186. It says that the maximum supply voltage is 24V with an absolute maximum of 26V. Maybe on the startup there's some spikes that go over that and it doesn't work that well ? I have placed caps on C2 and C3, 500pF. They helped with the consistency and turned the signals between the opamps DC, but the startup problem remained. I also tried to add a 100nF decoupling cap on the supply pin of the TLV2186 but still nothing. Have I missed something obvious ?Thanks
0.8mm BGA package and PCB pooling services - Page 1
Forum section: electronics / projects

author: homebrew
author_rank: Frequent Contributor
timestamp: August 13, 2016, 09:16:51 am
content: I'm trying to design a prototype system around an ARM Microcontroller (ATSAMA5D31A-CUR). Unfortunately it comes in a 324 ball LFBGA package. I'm not scared by BGA per se but it pushes on the limits that the standard PCB manufacturers are able to do in a pool service.As this is my personal fun project I cannot spend a fortune on the PCB. $200 is the limit I did set myself for the PCB (4-layer).Under this conditions the best options I could find were 0.2mm finished hole size and 0.125 mm clearance & restring.Now to the problem: Doing a standard "dog-bone" fanout seems just not possible with these dimensions. However, pushing them a little yields the desired results. With a wire-to-via clearence of 0.117mm and a restring of 0.12mm I get pass the DRC-check.So, this is a 6.4% deviation in the clearance and a 4% deviation on the restring.What are my chances of getting a working board? Is it even worth trying?

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 14, 2016, 12:33:56 am
content: Me, I'm lazy. I'd buy a Beaglebone. If not, well, there are better breakout patterns than that one.http://www.npiservices.com/wp-content/uploads/2011/11/Mentor_Graphics_BGA_Fanout_Patterns_-_Pfeil_03c.pdfhttp://www.aetpcb.com/aet/net_resources/help/BGA_Breakouts_and_Routing.pdf
0 degree connector - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: February 24, 2017, 05:02:51 pm
content: I have been searching Digi-Key for a connector with the same configuration as shown below with pins and screws on the front face and wires in at 90 degrees. I think this would be considered a zero degree connector. Digi-Key lists 45, 90, 180, 270 etc, but not zero. 5mm pin spacing would be ideal, anyone no where I can find these?

author: amitchell
author_rank: Regular Contributor
timestamp: February 25, 2017, 12:07:41 am
content: Wire to Board terminal blockhttp://www.digikey.com/products/en/connectors-interconnects/terminal-blocks-wire-to-board/371?k=&pkeyword=&pv89=133&FV=ffe00173&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=250That link is 5mm spacing

author: Jester
author_rank: Frequent Contributor
timestamp: February 27, 2017, 02:08:42 am
content: Quote from: amitchell on February 25, 2017, 12:07:41 amIt may not be obvious from the image that I included that this is not the commonly available wire to board connector, the black connector accepts the wiring, however the signal is passed onto the actual thermostat circuit board (not shown) via pins facing forward (just below the screws)
008004 capacitors are 150 times more expensive than gold - Page 1
Forum section: electronics / projects

author: avandalen
author_rank: Contributor
timestamp: January 04, 2022, 10:40:13 am
content: The following argument is philosophical:In the past, a lot of effort was made to create gold, of course that didn’t work. But now you can transfer cheap material into something that is 150x more expensive than gold. Namely MLCC capacitors in size 008004. The size is just 0.25 x 0.125 x 0.125mm, the weight is 16 micrograms and the price is about $0.1 per piece.That makes $6000 per gram which is 150 times more expensive than gold. Moreover, a cube of 1cm3 built from these capacitors costs $25000.(If I've made a mistake, I'd like to hear about it.)

author: westfw
author_rank: Super Contributor
timestamp: January 04, 2022, 12:21:27 pm
content: Presumably they’re much cheaper if you buy enough of them to make up a couple of grams.0201 0.1uF caps at digikey start out at about $0.10 each for one, but drop to $0.0025 or so if you buy a full reel of 15000 for about 37.50….

author: Zero999
author_rank: Super Contributor
timestamp: January 04, 2022, 01:48:23 pm
content: 1) Buying in bulk and direct from the manufacturer is much cheaper.2) Most of the cost is in the manufacturing, rather than materials.3) Commercial software costs more than gold. The cost per mass is infinite.

author: Siwastaja
author_rank: Super Contributor
timestamp: January 04, 2022, 04:54:30 pm
content: Quote from: Zero999 on January 04, 2022, 01:48:23 pmI don't know. By Shannon's information theory, you could attribute some energy for the information stored in the bits you receive, and then you can apply Einstein's mass-energy equivalence to find non-zero mass, making the cost non-infinite.But pretty expensive, still! If you receive the software on a physical disk or USB stick, or get printed manuals, then it's a bargain, maybe in the same order of magnitude to gold.

author: BrokenYugo
author_rank: Super Contributor
timestamp: January 04, 2022, 05:44:49 pm
content: Is that the full reel price per piece, or a small quantity of cut tape?EDIT: That is reel pricing, and $0.10 is on the low end, I suppose these are so small it's past "smaller=cheaper" and more for black magic microwave stuff or whatever.

author: Halcyon
author_rank: Unknown
timestamp: January 04, 2022, 11:33:54 pm
content: I smell a possible future spammer or bot... hmmmm...

author: Benta
author_rank: Super Contributor
timestamp: January 05, 2022, 12:18:51 am
content: Quote from: Halcyon on January 04, 2022, 11:33:54 pmMe too. One post and a ridiculous comparison. More like a Troll. But let's see.
0805 or 1206 2cm reflector sensor - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 27, 2016, 06:15:05 am
content: Hi,I wanted to know if anyone has any experience using discrete 0805 or 1206 IR transmitter and receivers to get at least 2cm of reflective response,I wanted to use them for my hobby project,yes it's a line following robot. I mean using something like these part numbers IR19-21C and PD15-21B-TR8Any cirucit design or Idea is welcomeThanks

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 28, 2016, 05:06:54 am
content: how we should calculate the reliable reflection distance?
0805 vs 0603 capacitor - Page 1
Forum section: electronics / projects

author: joersam24
author_rank: Contributor
timestamp: February 19, 2014, 07:29:23 am
content: With the same capacitance and voltage rating. Is 0805 capacitor has an advantage compare to 0603 in terms of performance?

author: free_electron
author_rank: Super Contributor
timestamp: February 19, 2014, 07:46:09 am
content: The dc bias derating will be less for a 805

author: peter.mitchell
author_rank: Super Contributor
timestamp: February 19, 2014, 08:41:31 am
content: ESR will probably be lower and thus so will the rated ripple current.

author: poorchava
author_rank: Super Contributor
timestamp: February 19, 2014, 08:44:26 am
content: In higher capacitance ranges (say, about 1uF) for the same capacitance and voltage smaller version will more expensive and/or will use lower performance dielectric material.

author: tszaboo
author_rank: Super Contributor
timestamp: February 19, 2014, 09:45:14 am
content: If you are really interested, download SPICAP to see the difference for different package AVX capacitors. Good for rules of thumb.http://www.avx.com/SpiApps/default.asp#spicap

author: JuKu
author_rank: Frequent Contributor
timestamp: February 19, 2014, 01:13:16 pm
content: For example: 1u/16V caps at 9V: 0805 is really 950n, 0603 is 500n. First, readhttp://www.maximintegrated.com/app-notes/index.mvp/id/5527, get horrified, start to care who makes your capacitors and start reading capacitor datasheets.
1.2/50us surge wave generator schematic as buildable project? - Page 1
Forum section: electronics / projects

author: Chris56000
author_rank: Frequent Contributor
timestamp: November 30, 2018, 06:19:14 pm
content: Hi!Just a quickie one!Does anyone have, or a link to, a practical design for a 1.2/50 us impulse generator that can be built, with a parts list and transformer details, rather than all the theoretical "spice" type waveform circuits with the technical derivations?I'm looking for something relatively easy to build with a simple status indicator on an LCD or warning lights!The project is for testing meter circuits for internal flashover after repairs – can these be bought second–hand or basket–cases for repair?Chris WilliamsPS!Can a PAT tester with a "H.T. flash" high–potential flash–test function be used to do this?(I bought a "spares or repair' Seward unit as a price I could afford with a smashed LCD I've not investigated yet!)