hybridfree/eevblog-posts huggingface dataset:
Eurocard enclosure - Page 1
Forum section: electronics / projects

author: BytesGuy
author_rank: Regular Contributor
timestamp: November 16, 2014, 12:03:04 pm
content: Hi All,I have decided to use eurocards for a large project of mine (probably something like thishttp://www.conrad.com/ce/en/product/531380/Conrad----Euro-processor-circuit-board----SU527831-------L-x-W-x-H-160-x-100-x-1]) and was wondering if anyone had any suggestions for an enclosure.Ideally I need several cards connected with a backplane (I'll make a proper pcb for that), but I am not sure how I go about finding a suitable (and cheap) enclosure.Appreciate any help and advice

author: SeanB
author_rank: Super Contributor
timestamp: November 16, 2014, 12:06:06 pm
content: Rack mount case for eurocards? Telecoms cabinets almost always use a similar size card, and the enclosures are common complete with the backboards and connectors inside already, often with the PSU as well.

author: BytesGuy
author_rank: Regular Contributor
timestamp: November 16, 2014, 12:38:00 pm
content: Quote from: SeanB on November 16, 2014, 12:06:06 pmThanks Sean, that sounds like the kind of thing I would like to have, especially if it comes with a pre-made backplane. I'll have a scout around, any suggestions for suppliers? Ideally as cheap as possible

author: Bored@Work
author_rank: Super Contributor
timestamp: November 16, 2014, 01:10:26 pm
content: Quote from: Newbzors on November 16, 2014, 12:38:00 pmJust look for 19" 3U enclosures. Eurocards were developed to fit into those. And you get all the mechanical components, like guiding rails and front plates for them. Backplanes are typically done with DIN 41612 / IEC 60603-2 connectors (they come in different sizes).
European supplier for yeonho SMH200 - Page 1
Forum section: electronics / projects

author: WimSchuit
author_rank: Newbie
timestamp: March 23, 2020, 10:25:14 am
content: For a project, I need a European supplier for the following connectoryeonho SMH200http://www.yeonho.com/ko/product/product_view.asp?part=device&idx=110http://www.tyu.com.tw/Upload/product/product_201711021126248591.pdfThis connector is in China easy to get, form a lot of different suppliers.But until now I didn't find a supplier in Europe who can deliver the connectors.Does anyone know a supplier in Europe witch can deliver the connector or a compatible version?
How to factory test EV-points? (Zln,Zlpe) - Page 1
Forum section: electronics / projects

author: Jeroen3
author_rank: Super Contributor
timestamp: August 28, 2023, 09:02:03 am
content: To test installations people use testers to measure circuit impedance Zlnand Zlpe.This is a suitable test forinstalledsystems that are live.Some (simple passive) circuits can also be tested by standard resistance measurement, these circuits are not live. This can be done as bench-test at the end of a production line.Problem:This standard DC resistance test does not work for EVSE subassemblies because the relay is not engaged. You need an EVSE -tester for that.How to do a bench test of the line resistances of only the EVSE assembly?You cannot get repeatable results with the Zlnand Zlpetests because you also measure the factory circuits up to the test station. You also can't use a soft AC source because it will trip (I tried).How are these circuits and cables validated?
EVAL-AD7606C18FMCZ Data Conversion Development Boards - Page 1
Forum section: electronics / projects

author: cncjerry
author_rank: Unknown
timestamp: March 09, 2021, 06:42:48 am
content: Anyone familiar with this board? 8 channels at 1Msps for $60 at Arrow.

author: cncjerry
author_rank: Unknown
timestamp: March 13, 2021, 06:06:45 am
content: further looking the board requires a specific mother board to run it. Both have FMC connectors and I bought one since my spartan board used for phase noise analysis has an FMC on it. Ill have to figure out all the signal lines, etc but it shouldn't be that hard. The eval has differential inputs for each channel, which is interesting. I'm not sure of my application yet, heck who needs one? but I'll report back.
EVAL-M1-CM610N3 altium design files - Page 1
Forum section: electronics / projects

author: Killo_Watt
author_rank: Newbie
timestamp: September 25, 2023, 02:48:01 pm
content: Hello,I am searching for the altium design files of the infenion EVAL-M1-CM610N3 (Eval-M1-CM610N3 is a complete evaluation board including a 3-phase CIPOS™ Mini Intelligent Power Module). Unfortunately I can't afford to buy one :'( but I want to see how to proper design a circuit with CIPOS IPM module.
Evaluating power supplies - Page 1
Forum section: electronics / projects

author: tchicago
author_rank: Regular Contributor
timestamp: February 01, 2021, 07:57:39 am
content: I noticed that I have about a dozen 12V power supplies powering various routers, cable modems, switches, clocks, tv boxes, etc. Approximately same amount at my parents place.Occasionally I find that some devices become excessively glitchy or completely stop working, and that is frequently fixed by replacing their 12V wall warts. I of course take those bad power supplies apart, and all of them have a bulged electrolytic capacitor. Usually, it is the filter capacitor at the output. The output becomes poorly filtered, probably having high ripple and also probably having a bad recovery time when the output current goes up or down.Taking all of those wallwarts apart and measuring the capacitors is not an option because most of them are made with ultrasonic welding, rendering them pretty much unrepairable. It is easier to just replace.So I decided to put together a rig to evaluate the performance of all wallwarts that I have, and find those that are close to failing, probably already causing the glitches. The idea is to measure two things. First, run them at a nominal 1A output current and measure the ripple with oscilloscope. Second, evaluate the output voltage recovery when the output current changes. For the latter part: two resistors and a mosfet, 300mA when transistor is open, and 1A when it is closed. Then feed gate with 20Hz square from function gen and see how the output voltage behaves.This rig works and gives some results.But now I'm stuck with figuring out what would be the baseline of a good/bad PSU.For example, 0.5V p-p ripple at 12V - is it good or bad?As for 0.3<->1A output current, the voltage changes around 0.2V, so I guess being within 2% of nominal is a good result. But still, what would be a bad result that would mean it is time to replace this PSU?So my question is - how can I find a detailed spec for a typical 12V wall wart power supply to compare my measurements to? I guess there should be some industry standard or some unofficial set of expectations that the household electronics designers have for power supplies.

author: todorp
author_rank: Regular Contributor
timestamp: February 01, 2021, 09:16:09 am
content: Get an original Apple PC charger (Magsafe) and use it as reference :-).

author: TimNJ
author_rank: Super Contributor
timestamp: February 02, 2021, 05:46:01 pm
content: Generic power supply specifications are usually:1% ripple (peak-to-peak), measured at 20MHz bandwidth with 1x probe, full load. So for 12V power supply, 120mV peak-to-peak max.5% max deviation during load step. Typical load step is 25 to 75% loadBut, with cheap bundled power adapters, who knows what they designed it to originally. "Steady state" ripple is probably a more reliable indicator of capacitor health. The load step/transient response may depend more on how the error amplifier was configured, the controller being used, feedback mechanism used, etc.

author: wizard69
author_rank: Super Contributor
timestamp: February 03, 2021, 12:49:13 am
content: Quote
Evaluation of a DIY power supply - Page 1
Forum section: electronics / projects

author: Dhanushka
author_rank: Regular Contributor
timestamp: June 24, 2019, 05:48:28 pm
content: http://www.electronics-lab.com/project/0-30-vdc-stabilized-power-supply-with-current-control-0-002-3-a/This is a adjustable power supply. What will be the performance of this as your experience according to information given?Thanks

author: David Hess
author_rank: Super Contributor
timestamp: June 24, 2019, 06:19:39 pm
content: It can be made to work but that common design has some pitfalls which others can comment on. There are suggestions for improvements somewhere.It is awfully complicated for its performance and features.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 24, 2019, 06:31:01 pm
content: That type of circuit is discussed over an over again. It is an old design, AFAIK based on an old (1970s) article from an US electronics magazine. It is also available as a cheap kit from banggood or similar sites.In principle the circuit is not that bad or overly complicated. However as shown it has some serious flaws: The TL081 is not good for a 44 V supply - the original circuit used a more suitable 741. With the TL081 the maximum AC voltage should be around 20 V, better 18 V. The 2N3055 is not really suitable to dissipate up to 100 W (some 33 V and 3 A). So the maximum current should be reduced - more like 1.5-2 A. Even with 24 AC the circuit can not reliable deliver 30 V, not even under no load conditions - more like 24 V max, less with a lower voltage transformer.

author: H713
author_rank: Regular Contributor
timestamp: June 25, 2019, 06:27:02 am
content: It's been a while since I last had to troubleshoot an NJE LVC series power supply (I scrapped my pair about a year ago after I got really tired of servicing them), but I seem to remember them using a very similar circuit, though a bit simplified. They were decent supplies, quiet (when working properly) and the load regulation was pretty good. CCS was pretty decent as well.I concur about the 2N3055, that's pushing it exceedingly hard, as has been mentioned the TL081 is a poor choice (+/- 18V maximum, so a 36v supply would be the max you'd want with one), and as mentioned it probably could be simplified a bit.

author: xavier60
author_rank: Super Contributor
timestamp: June 25, 2019, 07:26:35 am
content: The design I used for a recent project evolved from a dysfunctional internet finding,https://www.eevblog.com/forum/projects/linear-lab-power-supply/msg2388873/#msg2388873It works very well now, used daily with with no sign of trouble.It is not obvious from the schematic that it has fast current limiting which many designs don't have.I can share my PCB layout also.
Evaluation of P2110B Power harvester receiver - Page 1
Forum section: electronics / projects

author: Nikos A.
author_rank: Regular Contributor
timestamp: May 05, 2023, 08:07:17 am
content: Hi guys,I want to evaluate the P2110B Power harvester receiver under different use cases. For the evaluation, I have the P2110-EVBPower harvesting module - P2110Bhttps://www.powercastco.com/wp-content/uploads/2021/06/P2110B-Datasheet-Rev-3.pdfEvaluation board - P2110-EVBhttps://www.powercastco.com/wp-content/uploads/2021/06/P2110-EVB-Rev-C-instructions-rev-1.pdfTransmitter - TX91501Bhttps://www.powercastco.com/wp-content/uploads/2021/06/User-Manual-TX-915-01B-Rev-A-1.pdfI want to measure the RSSI in mW. The P2110B datasheet provides a logarithmic scale of RSSI vs RFIN. How do I find the equation of the line?
EVSE control pilot cable PWM parasitics - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: December 18, 2019, 10:28:19 am
content: Looking athttp://www.ti.com/tool/TIDA-00637#technicaldocuments, the schematic shows 910R in series with 1kHz PWM on EVSE side whilst the EVSE standards docs I have seen show 1k (that is R1 on the LTSpice file).I do not think this change (to 910R) relates to the PWM detect portion. Does the move from 1k to 910R relate to the cable charateristics or the op-amp output stage? The documentation is light on this"This design has selected the OPA171 amplifier based on its input range characteristics (up to ±18 V)and ability to handle various line impedance changes, even non-resistive changes in the event of cable parasitics."Does a model of a typical EVSE Pilot cable exist for LTSpice anywhere?
Exact Type 251 Function Generator 1mHz to 10kHz with tubes - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: July 16, 2022, 05:45:49 pm
content: funny when it happens, when something spark over and create a little bit smoke and spark soundsand even more rare to catch it on video,a bit unlucky wife was nearby :-)he he, but here it is :at about 13 minshttps://youtu.be/tl8VlJ0a02kthe rest of the video is also quite great, a tube based generator that goes all the way from 1mHz !!imagine the scope picture sample time ??33 mins for a scope sweep, i also show that in the video
Examples of well done, small LCD user interfaces - post them up! - Page 1
Forum section: electronics / projects

author: george graves
author_rank: Super Contributor
timestamp: June 28, 2013, 12:22:43 pm
content: So - GLCD's are getting so cheap. It's almost a no brainier to include them in a project. (well, there are bus speed issues, and such....)But....I wanted to dedicate a thread to well designed graphical displays on 3" or smaller LCDs.Anyone have some "knock your socks off" graphical UI designs you've made or see?All I can find is something that looks like it was...well...designed by an engineer.

author: Skimask
author_rank: Super Contributor
timestamp: June 28, 2013, 01:49:06 pm
content: Not a bad idea...Bought a 3.5" TFT LCD module with touch panel off ebay for ~$20 awhile back.Cut apart a CD jewel case, glued it all up, works for me.I use a piece of CAT 5 for connection to the module and only takes 8 lines to drive the whole thing....3.3v, Ground, LCD-CS, LCD-RESET, Touch-CS, SPI-MOSI, SPI-MISO, SPI-CLKI place a LAN jack on practically every project I do these days just for this purpose. Each project has a jack, but I only need to have one TFT LCD module for each one.Since I did this one, I've also bought a 5.7" and 7.5" TFT LCD module off ebay (both are 800x480), and I'm still looking for a decent generic case to put them in, but the connections still remain the same, 8 wires.

author: Ziltoid
author_rank: Contributor
timestamp: June 28, 2013, 09:12:56 pm
content: I was searching for a cheap SD Card Reader and found this one SD-Card reader with an LCD:ebayFor 4,40€ i cant complain its 1,8" (128x160) for some GUI to small but if you dont need to display a lot of data its nice an easy to use. There is a How to, to get it runnig atadafruit.

author: Baliszoft
author_rank: Frequent Contributor
timestamp: July 03, 2013, 08:23:12 am
content: Erm, well... just a simple menu for one of my projects.
EXAR datasheets - Page 1
Forum section: electronics / projects

author: nanodocl
author_rank: Contributor
timestamp: September 28, 2023, 10:19:14 am
content: Hello guys,I am looking for two old EXAR datasheets. Part numbers are SC1093-01 and SC0423-00, DC 1989 and 1990 respectively.I have about 100 pieces each and I do not even know what they are for. Any help will be appreciatedthanks in advance!

author: RES
author_rank: Regular Contributor
timestamp: September 28, 2023, 11:48:51 pm
content: found this:http://www.bitsavers.org/components/exar/_dataBooks/1986_Exar_Databook.pdf

author: coromonadalix
author_rank: Super Contributor
timestamp: September 29, 2023, 11:37:58 am
content: the trick is the SC prefix some websites do say SCxxxx is an Exar part?normally Exar was mostly known with the XR prefix ??this one is an 1992 warning 377 megs, but no SC numbers in ithttps://ia600301.us.archive.org/10/items/Exar-Databook1992OCR/Exar-Databook1992OCR.pdfhttps://ia902905.us.archive.org/5/items/Exar-ApplicationsDataBookOCR/Exar-ApplicationsDataBookOCR.pdfhttps://www.bitsavers.org/components/exar/_dataBooks/Exar_Product_Guide_198106.pdf@OP pls provide picture of the ic's top cases

author: coromonadalix
author_rank: Super Contributor
timestamp: September 29, 2023, 11:52:45 am
content: SC0423 research on an old 2007 thread ?SC0423-00, 18 pin, single-in-line (SIP) stereo amplifiers ?
Excel graph intercept points. - Page 1
Forum section: electronics / projects

author: geggi1
author_rank: Frequent Contributor
timestamp: July 29, 2022, 06:20:22 pm
content: HiI'm playing a with excel and some datasets downloaded form the Megger MIT525.I need to plot this in a excel spreadsheet and compare this to a calculated constant, but this can also be plotted as a line on my chart.What is the simplest way to find the intercept point between the dataset form the MIT525 and the constant.

author: mikerj
author_rank: Super Contributor
timestamp: July 29, 2022, 09:42:42 pm
content: If it's a straight line fit then you can use the SLOPE() and INTERCEPT() functions. If you want a polynomial fit then you can use the LINEST() function.

author: geggi1
author_rank: Frequent Contributor
timestamp: August 02, 2022, 11:45:00 am
content: Hi.I'm getting a bit further on the project but have met a new challenge.Because I'm using CSV import in the spreadsheet it is locked to the data source used when making the sheet.Is there some simple way to change the reference to a different file.I was hoping to find a way either by putting the link to the file in to a cell or opening a browser window to select a new file.My spreadsheet is for analyzing resistance measurements streamed from a Megger MIT525 and similar instrument.It can be used for motor and cable measurements.

author: Terry Bites
author_rank: Super Contributor
timestamp: August 02, 2022, 03:51:50 pm
content: Use the=hyperlinkfunction not insert link or ctrl k. Take care with the syntax. The first parameter is the link, the second is the cell value.Works for urls, local and relative files. A faff but seewww.contextures.com/excelhyperlinkfunction.html#videoformula
Excel spreadsheet calculates snubbers--error? - Page 1
Forum section: electronics / projects

author: iXod
author_rank: Frequent Contributor
timestamp: September 16, 2017, 03:54:49 am
content: This spreadsheet:http://www.hiquel.com/fileadmin/userfiles/AppNotes/Deutsch/HIQUEL_SnubberCalculator_AppNote_DE_0100.xlscalculates R & C values for DIY snubbers.Formulas (like C42) reference C187. I can find no C187; row 187 has been removed.I'm not using Excel but Open Office, so I'd like to know: someone using Excel, do these formulas work for you? Or do you also missing row 187?I'd gladly ask the web site owners to fix this if I can be sure it's not a file compatibility issue.Thanks.

author: Ian.M
author_rank: Super Contributor
timestamp: September 16, 2017, 04:06:33 am
content: Opens OK in Excel 97 with no cell errors visible. Altering parameters changes the results, but I don't speak German and don't care enough to machine translate it so I may have missed something.

author: iXod
author_rank: Frequent Contributor
timestamp: September 16, 2017, 04:34:16 am
content: Thanks Ian.If you click on cell C42, does it reference C187? Do you see row 187 on the sheet?Thanks again.

author: Ian.M
author_rank: Super Contributor
timestamp: September 16, 2017, 05:03:30 am
content: The workbook has three sheets:Relaisschutz_ueber_Last_ACRelaisschutz_ueber_Schalter_AC *Thyristor_Triac_AC* indicates the one it first opens to. On that sheet, C42 has the formula=C187^2*C36and the value 20231.86C187 contains the formula=C22*SQRT(2)and the value is 14.14213562Rows 167 to 266 are hidden.

author: iXod
author_rank: Frequent Contributor
timestamp: September 16, 2017, 05:07:22 am
content: Thank you. Very helpful.Cheers.
Excellent Queue, Circular buffer, FIFO, LIFO,FILO,LILO, stack, etc... C library - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: November 11, 2018, 06:19:07 pm
content: We use all kinds of data buffers in our daily life programs , I know it may be sound a dumb question, and I know there are countless implementations out there, But I want to know if you know some better C libraries for these different kinds of buffers, with embedded concerns in mind.

author: Nusa
author_rank: Super Contributor
timestamp: November 11, 2018, 07:05:10 pm
content: Exercise for the reader:1) How many different names for buffer types have you heard of?2) How many of those are really different names for the same thing?Is there a difference between a queue and FIFO? How about a stack and LIFO? Are LILO and FIFO different?3) How many unique buffer types can you think of?

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: November 12, 2018, 11:52:27 am
content: Thanks for the info, I know they have different names, but we have at least 3-4 types. so do you recommend any implementation?

author: Nusa
author_rank: Super Contributor
timestamp: November 12, 2018, 01:09:52 pm
content: There are many types of data structures, but for the subset called buffers, you really only have two basic types. FIFO and LIFO. Everything else is implementation details.FIFO = LILO = Queue = some of your etc. Circular buffer is a common way to implement a FIFO.LIFO = FILO = Stack = the rest of your etc.Here's a couple links to read and learn from. Several different implementations are presented, with code. This is simple stuff, so there isn't much code. Turn them into libraries if you want.https://www.geeksforgeeks.org/stack-data-structure/https://www.geeksforgeeks.org/queue-data-structure/As for which methods will work well for a particular task, you really need to detail the task first. Pointing you at random libraries isn't going to do you any favors, especially in the embedded world where hardware resources are limited.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: November 12, 2018, 02:24:55 pm
content: Thanks, I also have founded this geeksforgeeks web siteit's a great website.
Excessive power consumption when MCU is in standby mode, touching the PCB fixes. - Page 1
Forum section: electronics / projects

author: Boscoe
author_rank: Frequent Contributor
timestamp: February 11, 2019, 03:54:23 pm
content: Hi all, I have this really strange issue that I can't get my head around. I have a custom PCB with an STM32L052 MCU, an external RTC and an ST25DV NFC IC. The MCU and RTC are always powered and the NFC is powered up when a rising edge interrupt (generated by the NFC field energy) is sent to the MCU. When the MCU is in standby the power consumption for my PCB should be around 15uA however it's currently hovering around 500uA which is way too much for my application. The strange thing is I can fix the fix by touching a UART pin on the MCU or by pinching the ribbon cable going from the MCU to the NFC PCB. I don't have to make an electrical connection to fix it. Just the presence of my hand or my ESD mat is enough.Now, I hear you say I need termination? I do have termination and I have modded the board by grounding every pin that isn't used on the microcontroller. All other signals are terminated to GND or 3V3 with a pull up resistor as necessary. There isn't any clocks, data being sent or any signal changing state at all. The MCU pins are put into analogue mode (lowest power) when slept, not that is matters as the memory is not retained in the mode I'm using. If I remove the NFC PCB and the ribbon, the power consumption goes up to 2mA.Any pointers or previous experience would be amazing. This worries me about EMC testing, too.

author: Andy Watson
author_rank: Super Contributor
timestamp: February 11, 2019, 04:01:53 pm
content: Have you got some floating digital inputs? And/or digital inputs that have an indeterminate analogue voltage on them?
Exchangeable battery/accumulator level measurement - Page 1
Forum section: electronics / projects

author: snx
author_rank: Contributor
timestamp: November 02, 2018, 10:43:00 am
content: Hi,My task is to measure the level of a battery (non-rechargeable or rechargeable). In the usual cases where the battery would be encapsulated in a product (mobile phone) one could use a host-side "battery gauge ic", in case of an exchangeable battery pack (cordless drill) one could use a pack-side "battery gauge ic".However, my situation is different. The design should allow the removal of a battery from a battery holder. The battery type is "16340" which is half of an 18650 battery. Therefore either a host side or pack side gauge ic can't be used.The following actions are physically possible:- User replaces empty battery with full battery- User replaces empty battery with particially charged battery- User replaces battery with accumulator or vice versa (full or particially charged).My application does not need a extremely accurate form of charge-level (like 87% known from mobile phone). I only need a rough indiction like 5%,25,50,75,100 that can be deliverd to a microcontroller and should be possible to read continously.What solution could there be for the problem?.
Workout equipment LED mod to make it more fun? - Page 1
Forum section: electronics / projects

author: cdev
author_rank: Super Contributor
timestamp: November 29, 2021, 02:57:33 pm
content: I recently found an elliptical cross country skiing exercise machine in perfect working condition being put out for trash. My sweetie and I have a little dolly for moving heavy things and we just walked it home. brought it home and now we are using it daily. It's not the most high end machine, but it does what it is supposed to do, and has a basic digital panel and everything works. Its a great core workout. Now that its getting colder this is really becoming useful. But the digital panel is lacking any connectivity. What I want is to hook it up via wifi or bluetooth to a linux box on my home network that can display workouts vs. time in a graph and save them To get a visual feedback aspect and get us to push ourselves more. I plan to save the data in a database table, to see if we are getting better and better.The machine is a cheap and generic elliptical trainer, its a Weslo Momentus 750. Its electronics are probably the same as a generic exercise bike, with an odometer, diplay for "distance" traveled, speed, and time since you started working out displayed.Has anybody else done this?Since the unit's electronics appears very simple, I am I guess assuming that I should be able to get the data out. What I am asking is has anybody else here done this, and what did you do, and did you have fun with/use it. Since this nice machine literallyfell into our laps we want to use it!The ultimate output will be to nginx (or more likely zope's own webserver) running on the Pi. I anticipate connecting the Pi to the elliptical machine using a wemos d1 mini or similar cheap wifi enabled microcomputer on the exercise machine, Passing the data to the PI I have a subnet thats left un connected to the outside and the d1 mini can send messages to the webserver via http over it. The raspberry pi can run a local instance of the zope application server and send the data via attributes in a URL. which zope then handles. It can then be saved or whatever.This is straightforward, fairly light on resource usage and flexible. ts very easy to process the data using zope and/or pgsql and Python.Has anybody else done the first part?I want to make it a bit like agame, in other words, fun.Maybe put some RGB LEDs on the "bike" panel area to provide some visual feedback, maybe go through the spectrum from purple to red as the workout gets more energetic..and I am wondering what kind of RGB lighting to use (peoples favorites?) I know zero about available RGB lights to hook upto. But even just simple LEDs would do. Really anything but I want to make it kind of fun, and bring out the competitive aspect of it.I want to run that off of the D1 mini's cpu and use a couple of NPN power transistors that I have to drive the LEDs. (not buy some thing else.) .Like most of us I have a zillion unused power bricks in various DC voltages and can use one of them to power this.Has anybody here done anything like this?
Expected or unexpected? THS 4131 You make the call - Page 1
Forum section: electronics / projects

author: w3amd
author_rank: Regular Contributor
timestamp: January 04, 2016, 11:45:19 pm
content: Hi all,THS 4131 powered from +/- 12V. Idle condition: Chip temperature 40 C. This is 20 C above ambient.The chip spec shows about 15mA idle can be expected. 24V * 0.015 = 0.36WIs this on par?TIA,John

author: dom0
author_rank: Super Contributor
timestamp: January 04, 2016, 11:49:43 pm
content: DatasheetSOIC 50 K/W .. +18 KVSSOP 35 K/W .. +12 KHVSSOP 100 K/W .. +36 K

author: w3amd
author_rank: Regular Contributor
timestamp: January 04, 2016, 11:56:19 pm
content: So in other words yes. Because of idle current you can expect 20 C rise on this chip without any drive. Wow.I just wanted to make sure I was correct as I mostly do software.ThanksJohn
Expected resistance between +5V and -5V rails - Page 1
Forum section: electronics / projects

author: staze
author_rank: Frequent Contributor
timestamp: August 21, 2015, 05:13:36 pm
content: I'm working on a repair (https://www.eevblog.com/forum/repair/global-specialties-pw-2120/) and I'm curious what one would expect the resistance to be between the ±5V rails. In my mind, 270ohms is WAY too low (that's measured one way (positive lead to +5V, com lead to -5V), opposite way it's only 230ohms or so). Are there any suggestions for what might actually be the cause of that?I did try going around with my 6.5 digit meter and measuring the resistance between those rails at each device that is connected to them, but found it was charging some capacitance, and causing ever increasing readings. So I just shorted both +5V and -5V to ground with some 10k resistors (so it would discharge any caps that were charged via the meter), but I couldn't find any smoking bullet, and I really don't want to just shotgun it, and pull every IC that is connected to those two rails (about a dozen).So, am I crazy, is that way too low? Am I stuck just pulling everything?Thanks all!

author: staze
author_rank: Frequent Contributor
timestamp: August 24, 2015, 05:18:15 am
content: solved. seems like the dual jfet that was attached to the rails was completely throwing off my measurements. Removing it resulted in normal readings.
Experice PCB board manufactures from  China - Page 1
Forum section: electronics / projects

author: makervier
author_rank: Newbie
timestamp: October 08, 2013, 07:53:08 am
content: From time to time I have used the PCB service from Sure Electronics.There are many PCB manufacturers in China and the price is reasonable as well as quality,As we all known that China is a place where the labor is low , here is a list of PCB manufacturers from China,most of them are found in threads on the board:http://www.goldphoenixpcb.com/http://www.raypcb.comhttp://www.wonderfulpcb.comhttp://www.chinapcbboard.comhttp://www.kingfordpcb.comhttp://www.xdpcb.comhttp://www.cycpcb.comThe list is not in any priority .New board houses may be added, along with some comments
Experience on Alpha & Omega semiconductor - Page 1
Forum section: electronics / projects

author: Siwastaja
author_rank: Super Contributor
timestamp: July 01, 2018, 03:16:41 pm
content: Hi,Anyone used Alpha & Omega semiconductor parts in production?It seems Digikey stocks quite some few DC/DC converters from them at very affordable prices, like one third to half the price of what others can offer in similar categories. However, it seems that for some parts, Digikey is the only distributor on the planet. This screams trouble in sourcing. Does anyone have experience on their reliability to provide, or other general comments about this brand?Specifically looking at AOZ2261. Looking at high level of integration, low price and stable availability. I'm most worried about the last.Thanks.

author: BravoV
author_rank: Super Contributor
timestamp: July 01, 2018, 03:22:02 pm
content: Similar thread I made while ago ->AO Semiconductor's products, are they decent ?

author: amyk
author_rank: Super Contributor
timestamp: July 01, 2018, 04:21:47 pm
content: Huge demand for their parts from PC manufacturers. I see their MOSFETs a lot in laptops.

author: beenai2018
author_rank: Contributor
timestamp: July 04, 2018, 10:35:44 pm
content: general comment-Had a Toshiba TV that used AO mosfets as backlight HV switches. One set was shorted out with a blown SMD Fuse. replaced ( and has been working fine for 3 years. (TV is a from 2008) . So original parts since ~9 years.
Experience Sharing on MC14541BDR2G Timer Circuit Design - Page 1
Forum section: electronics / projects

author: Cathine
author_rank: Newbie
timestamp: April 17, 2025, 08:03:25 am
content: Hello everyone! I’ve recently been working on designing a low-power timer circuit using the MC14541BDR2G (programmable timer IC) and found its stability and power consumption performance to be quite good.Circuit Application:Used for adjustable delay switches (~10s to 10min range)Supply voltage: 5V, measured power consumption <1μA (in standby mode)External RC configuration follows the datasheet, but it’s important to note that capacitor leakage current can affect timing accuracyIssues Encountered:Previously, I purchased a batch from a platform where there were batch-to-batch variations (some ICs had unstable startup delays). However, a later batch I bought from a store on AliExpress turned out to have much better consistency. Have any of you used this model recently? Do you have recommendations for other reliable sources or alternative models?I’ve attached my test circuit diagram (see below), and I’d appreciate any feedback!

author: Benta
author_rank: Super Contributor
timestamp: April 17, 2025, 11:19:02 am
content: Not readable.Draw it on a piece of paper and take a photo instead.
Experience w. embedded OFDM/etherenet modules Adatis 2LAN500 or BEL 0804-5000A50 - Page 1
Forum section: electronics / projects

author: clovek
author_rank: Newbie
timestamp: October 09, 2018, 04:56:49 pm
content: Hello,I am working on project with Adatis 2LAN500 that includes QUALCOMM Atheros AR7410/AR1500 chipset. That is similar module to BEL 0804-5000A50.I cannot get module communicate in either MAC or PHY mode with FPGA. The configuration over MDI is correct. When I connect it directly to PHY chip or command it from FPGA over MII it does not communicate. When I am using identical designs with Marvell 88E1111 PHY it works perfectly. My idea was to replace the Marvell with the OFDM board.The documentation of OFDM board is horrible and documentation of chipset is proprietary and not available.Do anybody have documentation of Atheros AR7410/AR1500 ?Is here anybody with experience with this modules? I cannot find anything on the internet.Thank you
Experience with Digi-reel - Page 1
Forum section: electronics / projects

author: michaelym
author_rank: Regular Contributor
timestamp: May 15, 2014, 12:26:53 pm
content: Does anyone have experiance good or bad with Digi-reels or MouseReel?Do assemblers prefer cut tape?

author: ConKbot
author_rank: Super Contributor
timestamp: May 15, 2014, 01:15:00 pm
content: Havent used either, but a lot of pick and place machines need a leader/trailer so they can run the tape though the appropriate path, hence the re-reeling service by digikey/mouser. Some machines dont need a leader though, so you can feed cut tape into them as needed, or some assembly houses can re-reel cut tape for you (for a fee of course) Check with your assembly house.

author: Neilm
author_rank: Super Contributor
timestamp: May 15, 2014, 07:23:13 pm
content: I have used them - they mostly worked. Sometimes the leaders are not joined very well to the reel which can cause issues but mostly they worked OK

author: nickm
author_rank: Regular Contributor
timestamp: May 16, 2014, 03:35:26 am
content: I tried to save money by just ordering about 25 extra pieces of cut tape for each cheap passive on a build. On a couple I ended up with several small pieces of cut tape which added up to the total I ordered, but could not be used at all. Turns out when they say cut tape they don't garentee that it will be one contiguous pieces of tape. I might have ended up saving money since the 25 extra pieces on each passive was nothing and paying 7$ per would add up quickly.

author: calexanian
author_rank: Super Contributor
timestamp: May 16, 2014, 03:45:41 am
content: On passives i try to buy full reels. For resistors it makes no sense since a whole reel is typically $15 or less. For i.c.'s its a pretty good deal though. The assembler we use has had good luck with digi reel's I have sent.

author: JoeyP
author_rank: Frequent Contributor
timestamp: May 16, 2014, 09:30:24 pm
content: Quote from: Neilm on May 15, 2014, 07:23:13 pm^This has been exactly my experience as well.In general, cut tape is a pain in the ass, and almost always results in wasted parts and extra labor costs.
Experience with FUXINSEMI Transistors? - Page 1
Forum section: electronics / projects

author: petersanch
author_rank: Regular Contributor
timestamp: November 30, 2021, 10:24:00 am
content: Has any body experience with FUXINSEMI brand from LCSC or JLCPCB?They make simple transistors like 2n7002 for less than others with same part number and specifications. I want to use them for production run but dont know their quality or reliability.

author: NorthernWing
author_rank: Contributor
timestamp: November 30, 2021, 07:04:18 pm
content: This isn't a great answer since I don't know about FUXIMSEMI, but I've always used Wuxi NCE for cheap MOSFETs/discrete actives from LCSC and they've worked great. Can be tough filtering out the rebrands/knockoffs on LCSC sometimes but it sounds like NCE does their own quality R&D and there's an old post somewhere around here pointing out that they've presented at a few IEEE symposiums which is a good sign. I assume they're similar to IXYS before they were bought by Littelfuse.https://lcsc.com/product-detail/MOSFETs_Wuxi-NCE-Power-Semiconductor-2N7002K_C169813.htmlEDIT: Yep, they've coauthored quite a few papers even through this year:Quote

author: thm_w
author_rank: Super Contributor
timestamp: November 30, 2021, 11:46:01 pm
content: https://www.eevblog.com/forum/projects/manufacture-recommendations-from-lcsc/They are probably fine but I would figure out how much you are saving, and if its actually significant or not.

author: petersanch
author_rank: Regular Contributor
timestamp: December 02, 2021, 11:56:47 am
content: Quote from: NorthernWing on November 30, 2021, 07:04:18 pmI will check for NCE. Thanks.With so many brands from LCSC it is tough to know what to trust
Experience with HDMI to MIPI boards for medium sized OLED displays? - Page 1
Forum section: electronics / projects

author: tinco
author_rank: Newbie
timestamp: April 22, 2019, 11:49:33 pm
content: Hi!I am working on building a musical instrument based around a DSP board hooked up to a BeagleBoneBlack, and I would really like it to have a 3"-5" OLED display. Since other aspects of the project are already challenging enough I want the display part to be close to plug and play, but I wouldn't be opposed to a little bit of coding and/or soldering if needed. I know there's a bunch of options for TFT screens in this size, but on an instrument I feel they would look crappy and unprofessional. Most instruments I know of have OLED displays, I reckon they are easier to look at from a distance under stage lights as well.So.. of course I want the two opposites, I want it to be easy and cheap, and also be the fancy thing that's explicitly not supported by manufacturers of both the SoC's and these displays in general, typical..On alibaba I found boards like this:https://www.alibaba.com/product-detail/lcd-monitor-power-circuit-panel-Driver_60839774148.html?spm=a2700.7724857.normalList.16.1d846d56U7aKat&s=pAnd sets like this:https://www.alibaba.com/product-detail/H381DLN01-2-3-8-inch-OLED_62000150595.html?spm=a2700.7724838.2017115.201.7d587754rVHnmMAnd sets like these which are really cool but a bit expensive:https://www.alibaba.com/product-detail/3-81-inch-1080x1200-hdmi-to_62018035662.html?spm=a2700.7724838.2017115.64.17166a303eYxBXThere's also a bunch of 5"+ OLED and AMOLED displays which are a bit too big for my tastes, but they've got little video demo's with them proving they're good and they're not expensive either. I bet if I looked harder I could find smaller displays.So, my question is: anyone have experience with building with these things? Anything I should look out for? I'm not 100% certain on the HDMI -> MIPI path, if you've got another solution I'm open too it. Besides the 3"-5" size, the resolution can be as low as 320x240 and the framerate as low as 3-5FPS. Maybe that opens up some other possibilities.Thanks!
Do you have experience with HUAYI chineese MOSFETs?  - Page 1
Forum section: electronics / projects

author: AnasMalas
author_rank: Regular Contributor
timestamp: September 27, 2022, 08:21:48 am
content: Hello! For a design, I am thinking about using mosfets I found on LCSC from HUAYI that have insane specifications for the price. Almost suspiciously in a too good to be true way. Compared to an infineon part, I found one from HUAYI with half Rds(on) (which is impressive because this part is sub 1 mohm!), with low switching losses, for about double the price.While I have found many users praising many other manufacturers, non for this one. I guess one positive is that Infineon trusts them enough for a product line (https://www.mouser.com/PCN/Infineon_20176A.pdf), but then again you can buy anything from China if you pay enough. The datasheets do feel well laid out and the data seems more like test data than is usual with mosfet datasheets (did they just throw one "random" sample on a machine and call it a day?)

author: AnasMalas
author_rank: Regular Contributor
timestamp: November 12, 2022, 06:03:27 am
content: I have the answer! I went and focused on other parts, and finally it came time to simulateHUAYI dont offer anything beyond the datasheet. Good luck simulating it
Experiences - Sierra Wireless CF3 2G/3G/4G modules? - Page 1
Forum section: electronics / projects

author: Ash
author_rank: Regular Contributor
timestamp: December 08, 2017, 10:02:27 am
content: Hi Everyone,I'm about to embark on an "IoT" (shudder, I hate the phrase) project with a very tight time frame. We need cellular Internet access and some reasonable processing power on the devices and have found the Sierra Wireless CF3 modules.These are basically an integrated modem and Arm Cortex A5 based computer that runs a Linux derivative OS. all this is good for us, we just need to bolt on our other bits.But before we venture too far, I was wondering:Has anyone has used these?Any surprises and gotcha's?Reliability / impressions / etc?There don't appear to be any other vendors making compatible modules, so we would be locked in for the lifespan of the product (a few years...). The majority of our market will be North America and Europe, but some in Australia. Unfortunately there seems to be only 3G support for Australia using the "global" version (no 2G here any more). 3G would be fast enough for us.https://source.sierrawireless.com/devices/wp-series/wp8548/https://source.sierrawireless.com/devices/wp-series/wp7502/https://source.sierrawireless.com/devices/wp-series/wp7504/I'd really value any input!Thanks,Ash.
Experiences with AliExpress deliveries --> USA? - Page 1
Forum section: electronics / projects

author: iXod
author_rank: Frequent Contributor
timestamp: June 22, 2020, 09:41:34 pm
content: During the coronavirus pandemic, what are your experiences with deliveries from AliExpress to USA?I presume early on there was basically none. What's it like now?Thanks.

author: thm_w
author_rank: Super Contributor
timestamp: June 22, 2020, 11:17:37 pm
content: https://www.eevblog.com/forum/reviews/aliexpress-scamminess/https://www.reddit.com/r/Aliexpress/Early on a few arrivals, now less slow but still not recovered.

author: mark03
author_rank: Frequent Contributor
timestamp: June 23, 2020, 12:31:17 am
content: A couple of small solar panels ordered at the end of April, supposedly arrived at US customs on June 10th, no updates since then. IME the virus has impacted the already slow US customs process, not just the actual moving-matter-through-space part of international shipping.
Experiences with JBC T245 handle clones from AliExpress? - Page 1
Forum section: electronics / projects

author: janika
author_rank: Newbie
timestamp: January 17, 2023, 04:30:34 pm
content: So i want to upgrade my cheap soldering iron i have at home. I'm planning to build the station from parts i have laying around, getting a clone T245 handle and using genuine JBC tips.Does anyone use a similar setup like i'm planning? Is the clone handle okay-ish or should i go for a genuine one (it costs like 5 times more)?https://www.aliexpress.com/item/1005003717752698.htmlhttps://www.aliexpress.com/item/1005003792432449.html
Experimental Sub-sonic Rumble Circuit - Page 1
Forum section: electronics / projects

author: jonovid
author_rank: Super Contributor
timestamp: March 27, 2023, 01:29:45 am
content: Hall sensor and a VCO at the end of a 10 Meter long telephone wire.for the detection of subsonic frequency's of moving trains and earthquakes.part of my own experimental design using parts that I have at hand.most are AliEx. the npn transistor is an odd unknown type .the first casualty was this dead circuit when moved over from the breadboard when it was working .I then re-made a second circuit that is tunable.been trying to add operating range to both the Hall sensor and the octave range of the 555 as a VCO.circuit is temperamental & must be tuned at its threshold. as a 8 up 20 to output at 5 V regulated power supply is next to be add to the circuitthe 5 vlot bus is because of the Hall sensor. the 555 output will power a low-pass filterso 555 square wave at 1khz can becomes a sine wave modulated by the Hall sensor.modulation circuit is near DC so no capacitors are used.the head unit and the phantom power supply are not yet made. frequency demodulation circuit.the mechanical part of the unit is somewhat easy. lead fishing weights recast.uses-train photography trigger - earthquake sensoronly part of the project shown here.
My experiments with modular electronic "blocks" 🕹️ - Page 1
Forum section: electronics / projects

author: Solder_Man
author_rank: Newbie
timestamp: March 24, 2022, 12:36:40 pm
content: Hey all,I wanted to share a little demo with my results so far from this "instant" breadboard of sorts that I've been designing for the last couple of years (I call it Project Pockit, because I aimed for compactness :-) ). And wrote some details further below in this post.DEMO:So, here's the technical overview:Many of you guys are familiar with reusable designs in ECAD, and more tangibly, IC breakout boards.This project is essentially an extension of that same kind of segmentary thinking, in an effort to make my rapid prototyping faster. Obviously, it's not a solve-everything project (embedded engineering is an actual field for a reason!), but I've found the platform great already for numerous device constructions.I began by making several modular PCBs, each with one specific function and following a universal connector format -- matching a base Core board which provides a grid of connection points. Then, I added 3d-printed housings (with reopenable snap-fits for easy modification of the internal circuits) on all of the blocks, for protection + aesthetics.The Core board is based around an STM32F4, and an optionally attachable Pi Compute module (Quad-core 1.5 GHz Broadcom BCM2711) for more intensive use-cases (some of which are demonstrated in the above video).The connection "slots" on the Core board essentially act as breakouts of the processor pins. Each slot includes shared buses like SPI and I2C, but also some unique GPIO, ADC, and other signals.The electrical connection of the blocks is accomplished using spring-loaded pins ("pogo pins"), while neodymium magnets are used to create mechanical attachment, which I've tested to be way stronger than what I typically need for prototypes.Been a long journey on this project, and satisfied with the results, but hoping to make further firmware refinements, especially for the automatic adaptive behavior that I showed in the video.Would be happy to hear technical suggestions or answer questions from you guys!- Solder_Man