hybridfree/eevblog-posts huggingface dataset:
'Gold' finish BNC Sockets - Page 1
Forum section: electronics / projects

author: German_EE
author_rank: Super Contributor
timestamp: May 01, 2019, 04:26:05 pm
content: I am looking for some 'gold' finishsingle holeBNC sockets, yeah, I know that it's not real gold but this is being done so that the BNC sockets on a piece of equipment match the other connectors. My Google Fu has failed me so does anyone know of a source?I need three

author: reboots
author_rank: Regular Contributor
timestamp: May 01, 2019, 05:30:41 pm
content: Are the sockets for video (75-ohm characteristic impedance) or another application (typically 50-ohm)?RF Parts has a gold-plated 50-ohm BNC female bulkhead jack:https://www.rfparts.com/connectors/connectors-bnc/bnc-panelpcb/ug1094a-u-g.htmlRF Parts are based in the US, and they have a $20 minimum order before shipping, but they say they will ship internationally.There's also this P/N OL1548 from China:https://www.ebay.com/itm/191084386919https://www.aliexpress.com/item/1568759861.htmlIt appears to be intended for a PCB end-launch configuration, so it might require some creative soldering. Characteristic impedance isn't specified, and the gold plating may not be entirely authentic.

author: German_EE
author_rank: Super Contributor
timestamp: May 02, 2019, 07:04:21 am
content: And we have a winner! Thank you to reboots, the sockets from RF Parts are just what I am looking for. Looking through the site I am sure that I will find something that will bring the order over 20 USD.
Gold plated outline Ground - Page 1
Forum section: electronics / projects

author: Nikos A.
author_rank: Regular Contributor
timestamp: January 03, 2019, 08:25:47 am
content: Hi everyone and happy new year,What is the purpose of this outline gold plated ground with vias fence?Please see the attached pictureThanks in advanceNick

author: ap
author_rank: Frequent Contributor
timestamp: January 03, 2019, 08:40:29 am
content: Does not have to be gold plated, but is exposed side area, so here no solder mask, just the board with its plating surface. Purpose of via fence is mostly to keep the EMI generated internally inside the board and not radiate this through the edges.

author: Nikos A.
author_rank: Regular Contributor
timestamp: January 03, 2019, 10:41:46 am
content: Thank you for the reply AP,In that case I suppose that the plating surface is ENIG? (that's why the gold color?)

author: deBug
author_rank: Contributor
timestamp: January 03, 2019, 06:38:43 pm
content: Yes, looks like ENIG.

author: German_EE
author_rank: Super Contributor
timestamp: January 03, 2019, 06:51:51 pm
content: Both a friend and I normally do this with our home made PCBs, it's a good way to ensure grounding to the case if you use one where the PCB just slots in, or it's a PCB case with the board soldered all the way around. For prototypes you can do the border with copper tape.
gold plated photoresistors - Page 1
Forum section: electronics / projects

author: AlcidePiR2
author_rank: Regular Contributor
timestamp: May 11, 2020, 10:55:02 pm
content: These photoresistors are labeledHP 0072 18EBut I could not find any information. They most probably come from a HP tracing table.Can someone identify them and provide link to datasheet or specifications ?Thanks

author: StillTrying
author_rank: Super Contributor
timestamp: May 11, 2020, 11:14:06 pm
content: I can't find a good match for them, but I don't think finding their light and dark resistances would be very hard.
Goldstar OS-9020G Oscilloscope fault. - Page 1
Forum section: electronics / projects

author: smray
author_rank: Newbie
timestamp: June 23, 2011, 02:23:27 am
content: Hi all,I was recently gifted a Goldstar Os-9020G oscilloscope. It powers on, and the screen attempts to display something, but within a second it goes blank. I was just wondering where I should start looking to find the fault.Thanks.

author: PeterG
author_rank: Frequent Contributor
timestamp: June 23, 2011, 03:20:22 am
content: A quick google turned up this site that has the service manual available for download. This should be a good starting point.http://www.eserviceinfo.com/index.php?pagetogo=6&what=search2I would start with the HT Power section.Regards

author: smray
author_rank: Newbie
timestamp: June 23, 2011, 03:27:08 am
content: Thanks. I had already found the service manual. I will have a look in the HT power section and see what I can find.

author: w2aew
author_rank: Super Contributor
timestamp: June 23, 2011, 04:06:13 am
content: Hopefully the service manual will help guide you through it. I agree, check HT first - well, really check ALL power supplies first. Then, check sweep, deflection and trigger circuits. If the service manual doesn't provide a logical approach, you might want to review this excellent book from Tektronix that goes through the basics of troubleshooting of a scope.http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf
GO/NOGO Single/Dual/Quad Op-Amp Tester with Offset Measurement Capability - Page 1
Forum section: electronics / projects

author: Messtechniker
author_rank: Frequent Contributor
timestamp: April 01, 2016, 01:42:35 pm
content: After having inherited a big batch of new old stock as well as used single, dual and quad op-amps of unknown condition, I was faced with the task of testing this batch before pressing the op-amps in to service. So I cobbled together mostly using parts from my junk box the test circuit given in the enclosed schematic. The test circuit has been designed to handle single, dual and quad op-amps in DIL packages. A green LED indicates that the op-amp section is OK, i.e. its offset is below the preset threshold. A simple cheap DMM connected to one of the outputs 1 to 4 indicates the offset voltage produced by the selected op-amp section whereby the reading needs to be divided by 100, i.e. 1V on the DMM corresponds to an offset voltage of 10 mV, 0.1 = 1 mV and so on. When an offset exceeds a pre-set threshold, then the green LED turns off.5 V power supply op-amps can be accommodated by adding the orange coloured circuit section and switching to 5 V operation. However, this 5 V mode is currently untested (lack of such op-amps in my junk box).I have also hacked together a piece of software, the screenshot of which is enclosed. Operation of this piece of software requires a VC 940 multimeter.Enjoy!Yours - Messtechniker
Good 12V power supply to tether a robot? - Page 1
Forum section: electronics / projects

author: buck converter
author_rank: Regular Contributor
timestamp: July 16, 2018, 02:05:03 am
content: I am looking for a good power supply to tether power to my FTC team's robot. The battery has a 20A fuse, so i'll assume that's all the amps the robot will ever need. I'm only a high school student, and i was wondering if Inductive loads powered by a switching or a ATX PSU would cause anything to blow up. At most there would be 8 550 sized DC motors, and 6 Hobby servos, starting at the same time. Also the tether cord could be up 10 feet. What gauge do you recommend for that? It would be alright if the voltage drops a few volts, as it already does when powered by a battery. I was even thinking of adding a resistor to simulate the ESR of the battery we usually use. I'm on a budget here but protecting the robot's sensitive cell phone and controller is most important.Here is the battery i'm trying to replace:http://www.revrobotics.com/rev-31-1302/Here is the motors we use:http://www.revrobotics.com/rev-41-1301/at most we would have 8 starting at the same timeServos:http://www.revrobotics.com/rev-41-1097/Here is a video ofjust the drivetrainof last year's robotfor a sense of scale. 18"x18"

author: Pack34
author_rank: Frequent Contributor
timestamp: July 16, 2018, 02:36:42 am
content: You could likely just use one of these:https://www.amazon.com/eTopxizu-Universal-Regulated-Switching-Computer/dp/B00D7CWSCG/ref=sr_1_4?ie=UTF8&qid=1531708369&sr=8-4&keywords=12v+power+supply&dpID=41jyorZ9%252BQL&preST=_SY300_QL70_&dpSrc=srchAnother option would be to use a 12V lead acid and trickle charge it. That way you have the high current loop self contained on the robot and simply replenish your power source constantly.

author: yngndrw
author_rank: Regular Contributor
timestamp: July 16, 2018, 04:44:32 pm
content: Here's a voltage drop calculator:https://www.rapidtables.com/calc/wire/voltage-drop-calculator.htmlI'd probably pick 12AWG (5.3% drop) or 10AWG (3.3% drop) myself, although those cables will weight a bit so you need to consider the impact of that on your robot.
good book on magnetic devices? - Page 1
Forum section: electronics / projects

author: sarepairman2
author_rank: Frequent Contributor
timestamp: September 07, 2015, 12:44:29 am
content: Are there any good books anyone can recommend about magnetic circuits/transformers/inductors that have a focus on implementation?Something written similar to "introduction to microwaves" by gershon j wheeler. I like how he gives you an equation but there is often a note like "in practice this is complete bullshit"Probably a older book would be better, one that focuses more on concepts then relentlessly bombarding you with equations. I don't want a reference manual like alot of text books seem to be.I noticed the quality of a book is often noted by how many times it is the primary reference in a research paper. I feel like the more papers you find with a book referenced as  the better it is, because you know the book actually taught the guy how to do something rather then exist as a implement to torture students with.

author: babysitter
author_rank: Frequent Contributor
timestamp: September 07, 2015, 07:43:34 am
content: I have the german issue of this,http://www.we-online.com/web/en/electronic_components/produkte_pb/fachbuecher/Trilogie.phpOf course it has some advertising character but well written imho.
Good books/papers/etc on PCB routing/placement/design? - Page 1
Forum section: electronics / projects

author: jeremy
author_rank: Super Contributor
timestamp: April 19, 2013, 12:46:41 am
content: Hi all,Most of what I have learned about the whole PCB design process comes from my own mistakes and talking to others in the business. Can anyone recommend any good books (reference or otherwise) in this area? I'm not all that interested in "how to use orcad" or "altium tutorial 3rd edition", but more on the science of this topic and good design practices.Thanks!

author: free_electron
author_rank: Super Contributor
timestamp: April 19, 2013, 01:34:27 am
content: working on one right nowto appear later this year.

author: djsb
author_rank: Super Contributor
timestamp: April 19, 2013, 09:21:06 am
content: I'm assuming your book will be Altium Designer based (which version?) or will it be more generic?David.

author: BravoV
author_rank: Super Contributor
timestamp: April 19, 2013, 09:26:53 am
content: Right the First Time: a Practical Handbook on High Speed Pcb and System Design by Lee W. RitcheyChapters summary :http://www.thehighspeeddesignbook.com/and you can download there too once you've registered, it will provide the link for downloading the book in PDF about 20 MB, yes, its free.My favorite is Chapter 25 : Right Angle Bends and Vias Potential Sources of Reflections and Other Problems

author: cwalex
author_rank: Frequent Contributor
timestamp: April 20, 2013, 10:19:20 am
content: Quote from: free_electron on April 19, 2013, 01:34:27 amWill your book be a guide aimed at novice? If so sign me up for a copy!

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: April 20, 2013, 10:32:13 am
content: I guess Dave's not one to toot his own horn.From David L. Jones himself,PCB Design Tutorialcan only be described as excellent.

author: Caleb_P
author_rank: Newbie
timestamp: May 01, 2013, 07:44:52 pm
content: When I was getting started in PCB design I bought this book:http://www.amazon.com/Circuit-Designers-Companion-Second-Engineers/dp/0750663707ISBN-10: 0750663707ISBN-13: 978-0750663700It is an amazing self teaching resource! I've kept it on my desk as a reference guide, used it meetings to back up a design decision and loaned to many of the people I work with. I highly recommend it to novices and experts.Cheers,Caleb

author: ohmineer
author_rank: Contributor
timestamp: March 11, 2014, 08:36:01 pm
content: Quote from: BravoV on April 19, 2013, 09:26:53 amDoes anyone know if the link for downloading the free copy of this book still works? I fill the form and hit the download button but I always end up in a blank page with no errors (I have tried different browsers). I would appreciate If someone could tell me another legal place to download the file.Thanks in advance!

author: andyturk
author_rank: Frequent Contributor
timestamp: March 11, 2014, 09:02:13 pm
content: Quote from: ohmineer on March 11, 2014, 08:36:01 pmIt worked for me 5 minutes ago (from inside the US).

author: ohmineer
author_rank: Contributor
timestamp: March 30, 2014, 02:44:38 pm
content: Thanks, I finally got the copy.
good cable wiring strain relief/mechanical implementation guidelines? - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: December 03, 2018, 05:49:12 pm
content: Is there any good documents relating to a good method of securing a wiring harness or cable into a chassis? For different setups, lengths, gauges, wire insulation types, all that stuff.I have read some military wiring requirements before but the documentation was very long dry and had no pictures or anything (interesting to note though the neat trick to cut a diagnol line into a grommet if you intend to use it in a key way to make the wire travel longer and less likely to remove itself from the grommet).Like good manufacturing data with maybe some test results etc.When I look at old equipment its secured like crazy with wires ties and stuff but I want to know the difference between good and bomb proof. I have an idea of what bad is, but I don't know how to properly design this without what is in my mind severe overkill.

author: bugrobotics
author_rank: Regular Contributor
timestamp: December 04, 2018, 07:17:32 am
content: I'm not aware of any such guidelines. The effectiveness of a particular cable strain relief depends upon the application. Environment variables (vibration, fluid ingress, etc.), mobility requirements, serviceability and more could make a particular solution overkill and expensive or inadequate.Were you looking for a solution to a particular situation or just curious? I'd like to hear about your findings if you have success in your search.

author: coppercone2
author_rank: Super Contributor
timestamp: December 05, 2018, 01:56:55 am
content: something like those milspec wiring guidelines but more modern I guess

author: tpowell1830
author_rank: Frequent Contributor
timestamp: December 05, 2018, 02:59:18 am
content: https://standards.nasa.gov/standard/nasa/nasa-std-87394EDIT: Starting on page 27 there are pictures...

author: coppercone2
author_rank: Super Contributor
timestamp: December 05, 2018, 04:02:45 am
content: forgot about nasa thanks. how are other space agencies with posting info?spacex? russia? public docs ?
Good cheap 3D printing service in UK ? - Page 1
Forum section: electronics / projects

author: perdrix
author_rank: Frequent Contributor
timestamp: March 18, 2021, 05:59:16 pm
content: Googling around to find a 3D printing service to print the front panel for Jared Cabot's TM500 Tester.Lots of expensive ones and the few cheaper ones I found so far seem want to hit me for a lot for postage (e.g. £8 to print then £14.50 p&p).Thinking white PETG or glass filled nylon?Any recommendations most welcome.Thanks, David
Good CNC milling supplier for aluminium end plates - Page 1
Forum section: electronics / projects

author: Martin F
author_rank: Regular Contributor
timestamp: May 10, 2018, 10:00:00 am
content: Hi all,We're looking for a supplier to create two end plates with CNC milling.Do you know of good providers that offer good value-for-money solutions?Best,Martin

author: Benta
author_rank: Super Contributor
timestamp: May 10, 2018, 01:53:43 pm
content: Basically any machine shop can do this. There must be some in your area.

author: langwadt
author_rank: Super Contributor
timestamp: May 10, 2018, 03:10:10 pm
content: Quote from: Martin F on May 10, 2018, 10:00:00 amnot super cheap but nice and easy and they put candy in the packagehttps://www.schaeffer-ag.de/en/

author: jeduffy
author_rank: Contributor
timestamp: May 10, 2018, 05:21:35 pm
content: schaeffer-ag also goes byhttps://www.frontpanelexpress.com/(for the Americans).
Good dac - Page 1
Forum section: electronics / projects

author: House91320
author_rank: Regular Contributor
timestamp: May 16, 2011, 12:52:21 am
content: I am working on a power supply and instead of a pot i want to use a dac. odes any one know of one that is 12c and is stable for this application, or a i2c liner regulator.

author: Unknown
author_rank: Unknown
timestamp: May 16, 2011, 01:35:58 am
content: Have a look at Maxim's non-volatile range of I2C digipots.

author: House91320
author_rank: Regular Contributor
timestamp: May 16, 2011, 01:38:52 am
content: can they handle the voltage

author: Unknown
author_rank: Unknown
timestamp: May 16, 2011, 02:09:06 am
content: If it is within their spec, they will.

author: House91320
author_rank: Regular Contributor
timestamp: May 16, 2011, 03:27:59 am
content: what is that spec called because i cant find it

author: allanw
author_rank: Frequent Contributor
timestamp: May 16, 2011, 03:28:07 am
content: Go on Digi-key.

author: scrat
author_rank: Frequent Contributor
timestamp: May 16, 2011, 08:57:27 am
content: As suggested, a search among distributor sites or manufacturer's sites is a good idea.If you need help from us, try telling the resolution (#of bits), voltage range, update frequency (I guess it's not the problem, if you're substituting a pot), accuracy, input logic voltage...If the output voltage is a problem, you can add a cheap opamp to adjust the range, too.

author: Unknown
author_rank: Unknown
timestamp: May 16, 2011, 09:00:28 am
content: The absolute maximum rating for the resistor ladder of digipots is usually the maximum supply voltage of the IC.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 16, 2011, 09:02:25 am
content: Microchip do some nice cheap DACs :http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=11028&mid=11&lang=en&pageId=79Way cheaper than Maxim etc. Probably more available too....
Good Design Book For Learning Electronic circuit Design!!!!! - Page 1
Forum section: electronics / projects

author: Gurumurthy
author_rank: Regular Contributor
timestamp: June 20, 2017, 03:41:54 am
content: Hi to all,Other than regular(University Exam) textbook like Sedra and Smith, Millman and Halkias Text book. Please give me some reference book which aims in analysis and design of Electronic circuit Design.Kindly do the need full...

author: Probb
author_rank: Contributor
timestamp: June 20, 2017, 04:13:47 am
content: "Electronic Devices" by Thomas Floyd is a good book to get your fundamentals. It's a textbook format, but the material is presented in a practical way - formulas for different devices are normally just given instead of mathematically derived and there's an enormous amount of application examples for each device presented.If you're looking for a book that provides a very different approach to classic engineering text book formats, check out "The Art of Electronics" by Horowitz and Hill. Some consider it the best resource for electronic design, and some think it's just a mess of material - Personally, I think it's a great book simply because it gives a variety of different ways to think about electronics that you might not normally consider.For an online resource, check out Analog Devices education section:http://www.analog.com/en/education/courses-and-tutorials.html

author: kridri
author_rank: Contributor
timestamp: June 20, 2017, 06:19:59 am
content: The book written by Tietze and Schenk, Halbleiterschaltungstechnik is also good but mathematical introduction to parts and their models. Combined with The art of electronics you will have a theoretical and practical text book
Good DIY cable tracer/toner/finder circuit ? - Page 1
Forum section: electronics / projects

author: MathWizard
author_rank: Super Contributor
timestamp: January 20, 2021, 10:39:47 pm
content: I have an old 14/2 Line+neutral wire that is in a junction box. I know where the power is coming in from the panel. I want to find where it goes after that, it might not go anywhere anymore, but it does carry on into the wall and near a chimney, so IDK how deep it's inside the walls, but it seems to go up to the next floor.But so when this wire is disconnected in that juntcion box, I'm content there's no power on it, and no one will hit any switches, or what ever, that might energize it.I can make a dual tone generator, like with square-wave circuits or a 556 timer. I can add a BJT output-stage too.Where's a good circuit for the E field detector circuit ? I'd lke to be able to detect the wire at 1-2ft (1/3- 2/3meters)And when I try to model something like this in LTSpice, I'm lacking the physics to come up with a signal input strength. Is it just basically Coulumb's law for a conductor with a voltage (and a common gnd back to the probe) , if I make a capacitive input probe ?

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 20, 2021, 11:58:25 pm
content: Make a low power "carrier current" AM transmitter and use a cheap radio as the receiver.

author: m k
author_rank: Super Contributor
timestamp: January 21, 2021, 11:41:16 am
content: That's much more convenient than what I had.An RTL-SDR dongle and old laptop for truck crane remote check.(afterwards it came known that its horn was disconnected)
Good general reference for transistor circuits? - Page 1
Forum section: electronics / projects

author: madshaman
author_rank: Frequent Contributor
timestamp: January 28, 2014, 06:14:49 pm
content: Hi, I have a number of good reference books on opamp circuits with detailed descriptions of the theory of operation.I'm looking for some suggestions on similar references that deal with transistor-based circuits. The sort of book you can sit on the throne and flip through randomly.Thanks in advance; all suggestions are welcome.

author: brianvg
author_rank: Newbie
timestamp: January 28, 2014, 06:25:44 pm
content: http://tietze-schenk.com/tsbook.htmGive this a look. Not specific to transistor circuits, but there will be plenty.

author: madshaman
author_rank: Frequent Contributor
timestamp: January 28, 2014, 07:28:43 pm
content: Thanks brianvg, that looks like a good book. Honestly I'm looking for something that goes beyond the basic circuits in each field and shows me some circuit ideas I haven't seen before.I already get plenty of this from various books and texts I have, but not all in one place.

author: Bored@Work
author_rank: Super Contributor
timestamp: January 28, 2014, 09:46:04 pm
content: If you want collections of transistor circuits you probably need to go back a few decades. When transistors were relatively new manufacturers tried to interest people by publishing transistor circuit collections. E.g. the GE transistor manual, the RCA transistor manual, Siemens design examples or the Mullard manual.They use transistors so obsolete, well ...

author: madshaman
author_rank: Frequent Contributor
timestamp: January 29, 2014, 03:19:23 pm
content: The best resource I've found so far are EDN articles and a couple books edited by Jim Williams.I find I get inspiration from novel and elegant problem solving approaches, especially while on the toilet. I'm hoping it will rub off.
Good looking Y-splitters for cables? - Page 1
Forum section: electronics / projects

author: ataradov
author_rank: Super Contributor
timestamp: March 01, 2016, 12:57:15 am
content: I'm looking for a way to make a good looking Y-splits in cables. In this case I have one cable (3 mm diameter) splitting into two (2 mm diameter). I can rig something up using heat shrink tubing, of course, but it ends up being ugly and inconsistent.I'll need ~200 of such cables. Volume low enough that no one will bother will injection molding, but high enough to think of something less ugly than heat shrink.Ideally I want the connection point to be as small as possible.I'm open to molding from epoxy and similar compounds with long cure time, but it wold be nice to see some specific instructions. I'm not in the mood for buying all sorts of mold-making chemistry just to trySeems like a rich field for DIYers, but I can't seem to find anything useful. I might not be using the right key words.Any ideas?

author: wraper
author_rank: Unknown
timestamp: March 01, 2016, 01:18:10 am
content: IMO it asks for crimp butt wire splice and then heat the heatshrink it contains. Or use those with crimpable insulation.

author: rx8pilot
author_rank: Super Contributor
timestamp: March 01, 2016, 01:46:15 am
content: A while back I did a y-cable mold in urethane. It was easy and I had control of the durometer. The materials came from Smooth On if I remember correctly.The mold was done in my CNC, but could easily be done in 3D printer. For 200 pcs, it could be a good option. They looked totally pro in the end.Sent from my SAMSUNG-SM-G890A using Tapatalk

author: DTJ
author_rank: Super Contributor
timestamp: March 01, 2016, 02:20:01 am
content: I've used adhesive lined heatshrink.While its still hot & the glue is molten use some needle or long nosed pliers to squish the heat shrink together between the "forking" cables. It works well and doesn't look too bad. Serrations on the plier jaws look like features on the finished part.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 01, 2016, 02:32:36 am
content: http://www.digikey.ca/product-detail/en/te-connectivity-aerospace-defense-and-marine/382A012-3-0/A101263-ND/2393319Might not be your idea of good-looking. It's certainly not my idea of good pricing...

author: ataradov
author_rank: Super Contributor
timestamp: March 01, 2016, 03:37:19 am
content: Quote from: Alex Eisenhut on March 01, 2016, 02:32:36 amWow! That's just stupid expensive, no matter what the application is. In my case the rest of the BOM is ~$10, so I'm most definitely not putting $20 piece of plastic in there

author: ataradov
author_rank: Super Contributor
timestamp: March 01, 2016, 03:38:45 am
content: Quote from: rx8pilot on March 01, 2016, 01:46:15 amI'll probably end up doing something like that. I have TAP plastics within walking distance. I'll stop by and ask what they can suggest in this case.

author: sangvikh
author_rank: Contributor
timestamp: March 03, 2016, 12:22:03 am
content: Maybe you can use something like sugru?It's a self curing moldable rubber.https://sugru.com/aboutEDIT: It's not particularly cheap though..
Good low leakage electrolytic caps? - Page 1
Forum section: electronics / projects

author: cvanc
author_rank: Frequent Contributor
timestamp: May 07, 2019, 01:28:17 am
content: Hi all-So I use and like the Nichicon UKL series of low leakage electrolytics. These have served me well but I am curious to know of other brands/series that I should also consider. Anyone got other types they like? Thanks.http://www.nichicon.co.jp/english/products/pdfs/e-ukl.pdf

author: cvanc
author_rank: Frequent Contributor
timestamp: May 10, 2019, 01:36:05 pm
content: Answering myself here...I found the Vishay/Sprague TVA 'Atom' electros are low leakage, although they are available only in axial form factorhttps://www.mouser.com/datasheet/2/427/tvatom-266625.pdfVishay/Sprague also has large beer can computer grade caps that are low leakage. This isn't what I'm looking for but here's the datasheethttps://www.mouser.com/datasheet/2/427/36ddedx-239977.pdfI haven't found any other vendors playing in this space, which kind of surprises me.

author: Kleinstein
author_rank: Super Contributor
timestamp: May 10, 2019, 09:27:08 pm
content: With electrolytic caps leakage is hard to separate from dielectric absorption. At least it is a very lengthy procedure. This a good argument to avoid specs that are too tight in this area.Not many applications need really low leakage electrolytic caps (maybe buffering small batteries) so not that much demand.

author: MagicSmoker
author_rank: Super Contributor
timestamp: May 10, 2019, 10:08:04 pm
content: Low leakage and electrolytic capacitor don't really go together, but given that leakage goes up with temperature, capacitance and percent of rated voltage applied, you can obviously arrange circuit conditions - if not environmental - in your favor: use the smallest capacitance with the highest voltage rating possible. Also possibly relevant is that the aluminum oxide dielectric tends to degrade after some time (undefined) without a bias voltage applied, so leakage tends to be highest in the first few seconds to minutes after voltage is reapplied.Other than that, consider a different dielectric is minimizing leakage is really important.

author: Obsolete units
author_rank: Newbie
timestamp: May 11, 2019, 09:45:30 am
content: If you need really low leakage, at 1uA or less, wet tantalum takes a lot of beating. But you need deep pockets - the Vishay SuperTan series are hundreds of dollars *each*. Carefully selected aluminium electrolytics will reach that sort of leakage if left with a stable voltage for a day or two, and orders of magnitude less cost.Jim Williams Linear Tech Apps note 124 describes a low noise low frequency technique that uses a 1300uF 30V wet tant that costs over $400 - but he needs nA leakage current. And even that cap takes 24 hours to charge
Good low-noise audio NPN transistors for headphone amplifier - Page 1
Forum section: electronics / projects

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: October 23, 2019, 08:16:28 am
content: I'm designing a (silly) headphone amp as a project. I would like some output NPN transistors for the final stage. I get about 1W of dissipation in the device and 500 mA max collector current. Preferably available in through-hole since this project will be bread-boarded and all that.Don't need a device that has a complementary PNP.

author: Zero999
author_rank: Super Contributor
timestamp: October 23, 2019, 09:16:15 am
content: Low noise isn't important for the output stage, since it's a unity gain emitter follower.How about the BD135?https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=17&ved=2ahUKEwju1-j0hLLlAhVStHEKHRDWAvoQFjAQegQIBxAH&url=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fdatasheet%2Fcd00001225.pdf&usg=AOvVaw1y7-G52L03pc8C9L8-XXTo
Good options for peak-detector diode - Page 1
Forum section: electronics / projects

author: sw_guy
author_rank: Regular Contributor
timestamp: February 03, 2024, 07:40:44 am
content: Surprisingly difficult to find a good diode. I have a few 1N5158 that work well. Unfortunately details and source unknown.I bought/tried:1N5819HW1-7-F (super barrier)Fluctuates (so, not exactly the same version as the ones I already have)SMD110PLQ-TP (schottky barrier)Fluctuates.MBR0520L-TPFluctuates.Before I start brute-force method (=buying a punch of diodes and keep on trying until I find a good one), I appreciate to receive good known options to start with.

author: Gyro
author_rank: Super Contributor
timestamp: February 03, 2024, 12:15:02 pm
content: Double post ofhttps://www.eevblog.com/forum/beginners/is-this-opamp-impedance-thing/msg5303437/#msg5303437This post lacks any context.
Good outdoor through beam sensor - Page 1
Forum section: electronics / projects

author: skydivewags
author_rank: Newbie
timestamp: June 20, 2023, 08:27:47 pm
content: I am looking for a good through beam sensor that will work outdoors. I would like to keep it on the cheap. I found the following sensors and they work but at the 8' distance I need they are very hard to align and keep aligned.https://www.allelectronics.com/item/osu-1130/span-style-color-ff0000-strong-reduced/strong/span-br-through-beam-photo-electric-sensor-pair/1.htmlThis is to track a dog going through a "gate". I have two sensors to try to catch all heights of the dogs. I looked at some light curtains but the cost is a bit high and I am not sure if they will work outdoors or not. If they will be easier to align and more robust, I might splurge on a light curtain.This is for a timed event, so I need to know when the dog goes through the gate, motion sensors will not be accurate enough as the dogs will be close to the gate before going through it.Thanks for any help!

author: artag
author_rank: Super Contributor
timestamp: June 20, 2023, 08:33:31 pm
content: Are single-ended sensors easier to align ? They work with a passive retroreflector / corner reflector so all the alignment is internal to the sensor.

author: skydivewags
author_rank: Newbie
timestamp: June 20, 2023, 09:11:11 pm
content: Well, a retro-reflective sensor eliminates half of the devices you have to adjust, so, I would say you are right. The only sensor I have like that doesn't have the range I need. It seems like the beam would have to travel twice the distance with that type of sensor, so that would have an affect.
Good place to buy 18650 cells in Australia? - Page 1
Forum section: electronics / projects

author: lja246
author_rank: Contributor
timestamp: October 29, 2022, 06:42:19 am
content: Hi all,Please let me know if this show be in another topic.I'm after some 18650 cells for a reasonable price from a store that is either in Australia or can ship to Australia for a reasonable postage price that isn't going to break the bank. I'm after 8 cells and I was hoping for them to be at least 2000mah capacity. I bought some from ebay in the past and to no ones surprise the advertised capacity is much lower when tested, they were advertised for 2200mah and when tested they came out to 600mah. I expected this as they were cheap and I didn't really care about the larger capacity just for testing but i'd like to stay away from random ebay sellers. That being said, if you can recommend a good seller that is on ebay that could also be an option.

author: connectTek
author_rank: Regular Contributor
timestamp: October 29, 2022, 11:39:07 pm
content: Lanlpus Heidelberg Melbourne.Have all brands and great prices

author: connectTek
author_rank: Regular Contributor
timestamp: October 29, 2022, 11:43:20 pm
content: Lanplus Heidelberg MelbourneThey have every brand and capacity.Lanplus.com.au

author: moffy
author_rank: Super Contributor
timestamp: October 30, 2022, 10:55:13 pm
content: I think you mean:https://www.lanplus.com.aunot that I have had any dealings with them or could recommend them.

author: connectTek
author_rank: Regular Contributor
timestamp: November 02, 2022, 04:00:08 pm
content: Yep, fixed thanks

author: SmallCog
author_rank: Frequent Contributor
timestamp: November 04, 2022, 02:53:50 am
content: Otherwise WES have Panasonic 3250mAh batteries at very fair prices if you know someone with an account.https://www.wes.com.au/mediapub/ebook/wescat2023/904/index.htmlIf you're eligible for an account I'd thoroughly recommend signing upI bought a bunch of Samsungs from Altronics a while ago but they seem to have discontinued them

author: bidrohini
author_rank: Regular Contributor
timestamp: November 05, 2022, 07:16:40 am
content: You can see at core electronics:https://core-electronics.com.au/power-batteries/liion-lipoly/18650-cells.html

author: Hydron
author_rank: Super Contributor
timestamp: November 05, 2022, 09:38:13 pm
content: The vaping craze has also resulted in new vendors of lithium-ion cells - finding a vaping parts supplier was the most economical way I could find to get a single decent quality 18650 in the UK.
Good potting compound - Page 1
Forum section: electronics / projects

author: haxby
author_rank: Contributor
timestamp: April 18, 2020, 10:39:23 pm
content: Hi all,I want to connect 3 conventional domestic electric water heater elements (4.8kw each) together to a small box, and then submerge the lot into a water tank.The connections in the box will then go to a 3 phase flex cable.I was thinking of using a waterproof box but I have my doubts that it will stay dry inside.The next thought is to just use any non-waterproof box and just fill it with potting compound.I have never used potting compound before. Is this a valid solution for potting compound? Or will the water just wick through the cables and get into the connectors?Depth is only 1m. Looking for recommendations on what brand of compound to use. I guess a flexible type might be best? I'm in Australia so RS or Element14 are preferred.

author: Muttley Snickers
author_rank: Unknown
timestamp: April 19, 2020, 12:50:39 am
content: Quote from: haxby on April 18, 2020, 10:39:23 pmI don't know about submerging a three phase connection but would expect that there is a recognised method and standard which would incorporate approved and certified products. It's not the type of job you want to do unless you are properly qualified and the work is done correctly and to the appropriate standard. The linked thread and video below may be of some assistance.https://www.eevblog.com/forum/projects/chemtools-pct-7000y-silicon-potting-compound-anyone-familiar-with/msg2643867/#msg2643867

author: haxby
author_rank: Contributor
timestamp: April 20, 2020, 03:38:58 am
content: Thanks for the link. Gurosil looks good but also looks like RS has discontinued the product... I'll try the RS silicon dielectric gel unless anyone else has any other ideas.....

author: coppercone2
author_rank: Super Contributor
timestamp: April 20, 2020, 05:46:50 am
content: i am interested in dp270however, it is rigid
Good quality 40pin FPC connector - Page 1
Forum section: electronics / projects

author: JaspaJami
author_rank: Contributor
timestamp: June 03, 2018, 05:18:00 pm
content: Im looking for a good quality 40pin FPC connector with 0.5pitch. Its going to be in motorcycle so lots of vibration etc. so looking for a connector that really stays when connected. Any recomendations?

author: JaspaJami
author_rank: Contributor
timestamp: June 03, 2018, 05:21:41 pm
content: Looking from digikey there seems to be slide lock, rotary lock, flip lock and latch lockhttps://www.digikey.com/products/en/connectors-interconnects/ffc-fpc-flat-flexible-connectors/399?k=fpc+connector&k=&pkeyword=fpc+connector&pv88=23&pv89=85&FV=ffe0018f&quantity=0&ColumnSort=0&page=1&pageSize=25
Good quality banana plugs in 2.5mm??  - Page 1
Forum section: electronics / projects

author: rx8pilot
author_rank: Super Contributor
timestamp: February 13, 2018, 06:15:33 pm
content: Anyone have a suggestion for sources of this oddball size in good quality?I have only found random Alibaba and the samples are marginal at best. The size is not a negotiable spec since I am interfacing with existing gear that has been manufactured since the 80's in that size.The metal needs to be good quality with a high cycle life. The gold plating should be durable and appropriate thickness. After receiving a dozen options from Alibaba - the sizes are all over the map, the plating is rotten, the resistance is high.In general, I only buy these in lots of 1,000 so doing a full custom design is not really practical unless my volume was far higher. The best I have found is from a distributor in UK that gets them from an undisclosed Chinese vendor. The quality is passable, but not great and they add considerable cost. The big issue is that they are not reliable. They took months to deliver the last batch I purchased and I am hoping to have some vendor alternates.

author: tooki
author_rank: Super Contributor
timestamp: February 13, 2018, 10:05:22 pm
content: Is the 2.5mm the diameter of the plug’s rigid shaft, or of the total diameter of the spring-loaded contacts?If it’s the latter, what’s the diameter of the rigid shaft? If it’s 2mm, then there’s lots of options from the European banana manufacturers, like Stäubli, SKS, and Schützinger. The latter also has 2.4mm banana plugs.Indeed, if you look for 2.4mm instead of 2.5mm, you find more results than with 2.5mm, making me think that 2.4mm was once a standard size. (2.4mm happens to be the closest diameter to 10AWG, though this may not be relevant here.)By any chance, are the sockets in question the 2.6mm ones used for model railroads and the like? If so, the 2.0mm banana plugs fit them surprisingly well. (The 2.6mm model railroad banana plugs are the kind without the sprung basket thing, they’re just a 2.6mm shaft slit to allow compression. So the socket is a simple tube, and the added almost 1mm of diameter on a 2mm banana plug provides for good contact.)

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: February 13, 2018, 10:59:09 pm
content: Or, to add to the confusion, do you want to use them in the so-called 'tip jacks'(MIL-C-28901/MIL-DTL-39024) whose NOMINAL diameter is generally given as .080" (2.03mm) with an unsprung plug and a sprung jack?(Same size as the tips on many common test leads, but some tend to be rather 2.2mm).Then be careful, because plugs with spring elements and jacks with spring element do not intermate well, often leading to destruction when de-plugging. Here, the unsprung 2mm plugs from SKS (Hirschmann) and their corresponding jacks work quite well.
good quality solderable 3.5mm headphone plug - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 25, 2018, 03:22:07 am
content: I repair my broken headphones and I like the look of these connectorshttps://www.ebay.ca/itm/Gold-3-Pole-3-5mm-Male-Repair-headphone-Jack-Plug-Metal-Audio-Soldering-Spring/281243011459?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649the quality leaves much to be desired. Hard to solder to, no secure gripping of the cable (it'll break the fragile connections instead of yanking the plug out of the jack), and the sleeve thread is terrible, it barely engages the thread and after soldering the wires it doesn't engage the thread at all anymore...The headphone cable I use is 1.9mm (75 mils) in diameter, it's round, not the side-by-side type.I could buy the whole cable pre-builthttps://www.ebay.ca/itm/3-5mm-Jack-DIY-Earphone-Headphone-Audio-Cable-Repair-Replacement-Cord-Wire-120CM/272902028155?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D40972%26meid%3D45a912277ee347c6be548019fbc44022%26pid%3D100005%26rk%3D5%26rkt%3D12%26mehot%3Dpp%26sd%3D232525442262%26itm%3D272902028155&_trksid=p2047675.c100005.m1851buuuuuuuut then I have the extra work of cracking open two shells and reworking the connections there, and I don't get to choose the length to the split. etc etc etc....Yes I'm complicating things. I enjoy that!Soooo.... any recommendations? Yes I tried the Neutrik 90 degree adapter and it's not that great either. Easier to solder to but doesn't work well with my cable thickness. The grommet is meant for a much thinner cable.

author: DaJMasta
author_rank: Super Contributor
timestamp: May 25, 2018, 05:58:08 am
content: It's a no frills option, but I recently got a few Neutrik REAN 3.5mm connectors which work well. Your normal solder lugs, all metal construction, a crimp strain relief, and a little insulating tube to keep from shorting to the housing. I think I spent like $6 or 8 (US) for 4 of them on ebayhttp://www.rean-connectors.com/en/products/35-mm-plugs/nys231

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: May 25, 2018, 06:15:34 am
content: I've used this kind for years for TSR balanced cables which get yanked in and out a lot:https://www.radioshack.com/products/radioshack-standard-phone-plug-3(yup, RadioShack)Shipping will hit you though unless you can find other items you need.

author: BrianHG
author_rank: Super Contributor
timestamp: May 26, 2018, 01:39:09 am
content: A goo thick heavy pure gold plating does help with longevity and quality of connection, as long as what you are plugging it into is also well gold plated.
Good resist for hand filling in pours? - Page 1
Forum section: electronics / projects

author: Dijital
author_rank: Contributor
timestamp: March 23, 2017, 07:08:28 am
content: I'm working on a design that has a fairly high power buck converter on the board. Given that I am using lots of large pours in the PCB layout. I can only do toner transfer though, and I don't want to deal with the headache of trying to get all those vast swaths of ink to transfer, nor do I want to use that much ink anyway. So in my design I laid outlines of the pours, and plan to fill them in by hand when I do the transfer.In the past I have used a sharpie to touch up traces, but never to fill areas. So I am weary of it's ability to work in situations like that. Can anyone recommend a good ink or marker I could use? I looked at some resist pens, but they are relatively expensive and don't have the best reviews. I wouldn't be opposed to using a paint brush if necessary, finer detail areas I could just have the printer fill in.Usually I etch with ferric chloride, but I also have sodium persulfate i could use.

author: sleemanj
author_rank: Super Contributor
timestamp: March 23, 2017, 01:10:31 pm
content: Try the staedler permanent special, looks like it gave reasonable results in this video...https://youtu.be/BMtYoMiKvMg

author: rdl
author_rank: Super Contributor
timestamp: March 24, 2017, 05:13:56 am
content: I've used model paint from the hobby shop and nail polish. Both worked well. I wouldn't use any that are "water-based" without testing first. Most are fairly waterproof when thoroughly dry, but better safe than sorry.
Good RF cases work great! and give you cancer! - Page 1
Forum section: electronics / projects

author: BiOzZ
author_rank: Regular Contributor
timestamp: April 06, 2013, 05:09:32 pm
content: OK the cases dont cause cancer but whats in them do!i have been using camel snus seance highschool and i have allot of these little aluminum containers laying aboutthey come in 2 packages the thinner more stackable one (top) with a nice seal and thicker rounded op onesthere WONDERFUL for RF shielded small electronics ... the noise in there is nearly none! ... it has a nice all around EMF seal with a lip and is made of nice thick aluminum and is real easy to cut apart with a drill!i have used Altoids containers before but these work much better!snus sells for about $3 here a container but if you do chewing tobacoo this is a nice alternative (not to mention much cleaner and no spitting ...) if you want a nice RF case ... you can probably find these online empty for cheap!i use them for everything from electronics to holding components safly to holding screws excand no they dont smell like tobacco ... they smell like mint!and YES IM AWARE some people think this stuff is gross i dont need your comments!PS: the snorter one has a "freshness seal" on the inside of a silicon rubber ring arround the inside of the top part ... its nice and air tight!PPS: the shorter one also is far easier to open up if you dont have finger nails ...Full disclosure: not telling anyone to get in to nicotine for these cases nicotine is bad and smoking is bad mmmkay?EDIT: i relize i have big hands so here are the dimentionstall: 80mm x 50mm x 20mm - 3.21in x 2in x 0.8inshort: 80mm x 50mm x 16mm - 3.21in x 2in x 0.6in

author: c4757p
author_rank: Super Contributor
timestamp: April 06, 2013, 05:31:57 pm
content: I'm not sure I'd call it an RF-grade shield, but it does work in a pinch. I use Altoids tins for this. My breath smells better than yours.

author: BiOzZ
author_rank: Regular Contributor
timestamp: April 06, 2013, 05:46:25 pm
content: Quote from: c4757p on April 06, 2013, 05:31:57 pmi have used altoids before and this is a much better all arround (as in 100% shielded) shield ... tho it IS thin aluminum its thicker than whats used in EMI cans XPand yes you and your fancy mints XP

author: westfw
author_rank: Super Contributor
timestamp: April 07, 2013, 07:09:59 am
content: These sorts of boxes are widely available WITHOUT ANYTHING IN THEM. No markings, no residue, no smells, various finishes, with and without hinges, etc. Search for "tin boxes bulk." Here's one example:http://www.papermart.com/Product%20Pages/Product.aspx?GroupID=20955&SubGroupID=20952&ParentGroupID=19037#20952Starts at about $0.50 each for that size, and goes down with large quantities.

author: peter.mitchell
author_rank: Super Contributor
timestamp: April 07, 2013, 08:06:02 am
content: since those are steel you can solder to them.