hybridfree/eevblog-posts huggingface dataset:
Looking for small square neck screws/bolts (15-20 mm length, < 2.5 mm neck) - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: January 10, 2020, 01:56:26 pm
content: Hi all,I'm looking for a product similar to the picture attached, i.e. a square neck bolt. I need a small version of this, along the following dimensions:- length: 14-20 mm- neck: 1.5-2.5 mm- thread: M3-M5I've been unable to find this anywhere where it's possible to buy it. It can also be a countersunk variant, that's less important.If any suggestions let me know - the key is to have something along the lines of a square neck, yet small. If you have ideas for other screw types, let me know.Martin

author: TassiloH
author_rank: Regular Contributor
timestamp: January 10, 2020, 02:36:33 pm
content: Not exactly what you are asking for, but you don't say what the square neck is needed for. Maybe you need the square neck only so that the bolt does not spin when stuff is screwed on (bolt inserted through square hole in metal plate or so). In that case these might work:https://dk.rs-online.com/web/p/presmonterede-gevindtappe/0827350/?sra=pstkLonger versions here:https://shop.kvt-fastening.de/de/en/53284/self-clinching-fasteners/self-clinching-threaded-studs-for-metallic-materials/fhs-stainless-steel/bn-20524_self-clinching-threaded-studs-for-metallic-materialsThey press-fit into a round hole and stay in place even without a nut on the other side. I have used the M4 version in the past to add mounting and grounding to aluminum enclosures.

author: Stray Electron
author_rank: Super Contributor
timestamp: January 10, 2020, 07:46:55 pm
content: In the US those are generally referred to as "carriage bolts" and they're available in most hardware stores. They're designed to fit into a hole, usually in wood, and to present a low, smooth head that clothing and other items won't snag on. Also the square shank prevents them from turning so you can easily install and tighten a nut onto the threaded end. They were originally used on carriages and wagons but are widely used on furniture today. It looks like the one in your picture with the shallow shank shanks is designed to fit into a thin piece of metal instead of a wooden plank but it's still the same concept. Ones with the shallow shank are widely used in commercial machinery and on farm equipment such as tractors. In the US if I couldn't fit a suitable one in a hardware store, I would check with one of the commercial bolt distributors or a company like Fastenal.

author: NorthGuy
author_rank: Super Contributor
timestamp: January 11, 2020, 03:25:36 am
content: Searching AliExpress for "neck screw m4" reveals quite a bit of listings which would meet your criteria.

author: beanflying
author_rank: Super Contributor
timestamp: January 11, 2020, 03:42:30 am
content: M3 and M4 might be an issue but M5 and up is fairly easy as Stray Electron stated 'Carriage or Coach Bolts or Screws' would be the 'normal' English description for them.evilbay search of '(Carriage, Coach) (bolt, screw) (M3, M4, M5)' should get you some hits
Sealing open sensor ports with tape before ultrasonic cleaning - Page 1
Forum section: electronics / general

author: Keagan
author_rank: Newbie
timestamp: January 09, 2020, 01:29:08 pm
content: Hi everyone,I would like to wash my PCBs in an ultrasonic cleaner. However, some of the components on my PCBs have open ports and any liquid that gets into those ports will damage the components. An example of one of these components is the BME280 environmental sensor (seehttps://www.digikey.com/product-detail/en/bosch-sensortec/BME280/828-1063-1-ND/6136314).I've read that you can cover these ports with protective tape to prevent liquid ingress but I'm not sure which tape to get. The tapes I'm considering so far are:mastic sealing tapes (e.g.https://www.digikey.com/product-detail/en/3m/4411N-TRANS-1-1-2/3M159228-ND/7364297)PCB masking tapes (e.g.https://www.digikey.com/product-detail/en/3m/851-GREEN-1-2-IN-X-72-YD/3M160749-ND/1819503)general protective tapes (e.g.https://www.digikey.com/product-detail/en/3m-tc/1-2-5-838/3M10387-ND/2649932)Is using tape even a good option, and if so, which tape should I use?I know I could desolder the open-port components, then wash the PCBs, then resolder the open-port components, but I'm hoping the tape thing works out because it will save me a lot of extra effort.Thanks in advance,Keagan

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: January 10, 2020, 02:16:40 am
content: The appnote recommends using kapton tape (pg16):https://ae-bst.resource.bosch.com/media/_tech/media/application_notes/BST-BME280-HS006.pdfBut can see this being awkward as hole you are trying to cover is not exactly in the center. Guess the question is why do you have to wash the boards in the first place?

author: Keagan
author_rank: Newbie
timestamp: January 10, 2020, 12:34:17 pm
content: I want to wash the boards so that they are nice and clean before applying a conformal coat.Thanks for highlighting that in the appnote. I found little kapton stickers (https://www.digikey.com/product-detail/en/3m-tc/5413-1000-1-4/3M155918-ND/4340927) which will be ideal if they seal nicely. I'll get a reel and see how they perform. Thank you!
Search website/database for EOL parts? - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: January 09, 2020, 01:45:39 am
content: Hi AllWould yous know if a good website to search EOL parts? So far I havehttp://www.eolpartfinder.com/https://www.rocelec.com/
Solenoid design - Page 1
Forum section: electronics / general

author: pisoiu
author_rank: Regular Contributor
timestamp: January 08, 2020, 02:52:03 pm
content: Hi,I need a solenoid with very specific dimensions and there is none available so I must build one. But I'm stuck with the shell material.Can anyone recommend me a supplier (in Europe preferably) of soft iron or other metallic compounds which can be used to build magnetic circuit of solenoid? The shape is cylindrical, 22mm in diameter.Thank you.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: January 14, 2020, 11:02:06 pm
content: I know there are a bunch of manufacturers in Japan that make custom solenoids, for example TAKAHAhttps://www.takaha-japan.com/As a side note they made a cool manga too:http://www.takaha-japan.com/wp-content/uploads/2017/01/Solenoid-Cartoon.pdf
A little perplexed  - Page 1
Forum section: electronics / general

author: Spark-Doctor
author_rank: Contributor
timestamp: January 06, 2020, 07:01:33 pm
content: Just been messaged by JLCPCB. My order has been suspended because I added 2 “outlines”

author: JPlocher
author_rank: Contributor
timestamp: January 06, 2020, 07:24:28 pm
content: > added 2 outlines... that aren't the same? Which one should they use? Sounds like an easy response, tell them which one - the larger or the smaller...-John

author: ataradov
author_rank: Super Contributor
timestamp: January 06, 2020, 09:02:05 pm
content: They are not wrong. Why do you have two outlines?

author: Spark-Doctor
author_rank: Contributor
timestamp: January 06, 2020, 10:54:50 pm
content: The red is the outline, the blue is keep out, it says so on the left side in their box

author: ataradov
author_rank: Super Contributor
timestamp: January 06, 2020, 10:59:23 pm
content: Your naming conventions do not follow their requirements -https://support.jlcpcb.com/article/22-how-to-generate-the-gerber-filesandhttps://support.jlcpcb.com/article/29-suggested-naming-patternsIt is on you to provide correct files according to their requirements.*.GKO is a standard accepted extension for a board outline.

author: Harvs
author_rank: Super Contributor
timestamp: January 07, 2020, 09:11:52 am
content: What's the reasoning behind sending a keep out layer to a fab?

author: GerardG
author_rank: Regular Contributor
timestamp: January 07, 2020, 09:31:03 am
content: If it is not clear to them then they will ask.You are sending a file to a Chinese manufacturer and not all Chinese speak English. Sometimes things get lost in translation.That is why you need to follow the naming rules.I think some of us would reject the boards with the wrong size.Would you have accepted the boards when they are the wrong size?I have been working with china for producing higher volumes.I was glad that they would ask questions when something is not clear to them.

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: January 07, 2020, 01:12:25 pm
content: You were aiming to shoot your own foot, they were nice enough to move the gun a bit to the left, so it misses your foot.Be nice, they are kind enough to double check with you..GKO is the standard naming for board outline.

author: NorthGuy
author_rank: Super Contributor
timestamp: January 07, 2020, 08:51:18 pm
content: It is very good that they ask. It would be much worse if they solved all the problems by themselves. Or worse yet if they changed something without asking. Then you end up with a wrong board.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 08, 2020, 10:31:06 am
content: What do you expect them to do with that information? It's unclear, they don't care what you call a keepout, they build the board, not design it.

author: donotdespisethesnake
author_rank: Super Contributor
timestamp: January 08, 2020, 11:46:35 am
content: Quote from: Spark-Doctor on January 06, 2020, 07:01:33 pmYeah, why are you sending them a keepout layer?You have to remember you are paying minimum price for this... keep it simple.
Circuit board sources ? ? - Page 1
Forum section: electronics / general

author: B J
author_rank: Contributor
timestamp: January 26, 2020, 02:57:18 am
content: I am looking for a source of small, low count , single sided boards. I want it where I can do the board layouts, send them in and have boards made. Who do you use, how much time, and how is your satisfaction? Rough pricing? -----I tried looking for info. here and on google, did some searches, and could not find what I am looking for. If this info. is available elsewhere and I missed it, point me in the right direction. Thanks

author: ataradov
author_rank: Super Contributor
timestamp: January 26, 2020, 03:35:26 am
content: AllPcb, PcbWay, JlcPcb are very similar and probably the cheapest options.

author: forrestc
author_rank: Unknown
timestamp: January 26, 2020, 03:53:57 am
content: Quote from: B J on January 26, 2020, 02:57:18 amNote that for low volumes, single-sided is pretty much the same as double sided. So be sure to quote 1 and 2 sides.pcbshopper.com is a good resource for quoting, however I've pretty much just ended up using jlcpcb all the time anymore since there are very few cases where they're not the cheapest. Plus they have a prototype special offer where it's $2 + shipping for qty 5 of anything 1 or 2 sided up to 100x100mm.
Nozzle / component matching - Page 1
Forum section: electronics / general

author: luk
author_rank: Contributor
timestamp: December 12, 2019, 09:35:46 am
content: Hi,Is it possible to find somewhere a mapping table of Juki nozzle ref (501, 502, 503, ...) to component type/size (0402, 0603, 0805, ...) ?Thanks!

author: sorteper
author_rank: Newbie
timestamp: December 12, 2019, 02:38:16 pm
content: I use this document found via Google. Can’t vouch for Avipre, who hosts the PDF. Don’t know who or what they are.Page 5 shows a chart for matching passives to Juki nozzle sizes.http://avipre.com/products/smt&tht/juki//Juki%20-%20Nozzle%20Catalogue-Rev-C3.pdf

author: luk
author_rank: Contributor
timestamp: December 12, 2019, 04:18:06 pm
content: Exactly what I was looking forThank you !

author: Proto
author_rank: Contributor
timestamp: January 06, 2020, 03:38:18 am
content: That attachment is the Juki catalog with their name and/or logo removed.
Any recommended assembly places for prototype stuff in sfbay area? - Page 1
Forum section: electronics / general

author: cirthix
author_rank: Contributor
timestamp: December 30, 2019, 02:53:18 am
content: Right now I have one board with one line item to do, but it would be useful to have a reliable place to do local prototypes. Anyone have recommendations?

author: JPlocher
author_rank: Contributor
timestamp: January 02, 2020, 03:20:50 am
content: We use Hildy Licht (http://hildy.com/) in MtView for small to medium production runs that are a mix of PTH and SMT. They effectively charge an hourly rate - the per-board / per panel cost works out to be the average time it takes to do one times their shop rate.They have been reliable, and their work is high quality; they are not too proud to admit when something didn't work as expected - and then they fix it. We don't need fast turns, but they still seem to get things done in about a week.Tell them that MRCS recommended them - it can't hurt :-)-John
Does anyone have used Chinapcbone?  - Page 1
Forum section: electronics / general

author: jealcuna
author_rank: Contributor
timestamp: February 18, 2020, 10:09:56 pm
content: Does anyone have usedhttps://www.chinapcbone.com/for mass production of PCB with assembly service?I have used "PCBWAY", but they say 60 to 70 days for my work, a PCB with 50 SMD components for 1500pcs. So, this brings me to chinapcbone which gives me a cheaper price but I can not find any review or experience.
Bonding together miniature enclosure - Page 1
Forum section: electronics / general

author: fx991ex
author_rank: Contributor
timestamp: December 31, 2019, 05:08:08 pm
content: I designed a small enclosure similar to the one on the attached picture. The two parts of the enclosure are machined from ABS plastic. The enclosure needs to be waterproof when assembled.I have used some generic super glue to put the enclosure together butI wasn't very pleased with the result. The bond was not very strong.Does anyone know what is the most common method of assembly in the industry for combining two parts together? For enclosures for RFID tags, usb flash drives, e-cigs, bluetooth trackers, earbuds...As far as I understand there are three basic options:- bonding with adhesive- bonding with solvent- ultrasonic weldingIs there any good adhesive on the market for my application?

author: SMTech
author_rank: Frequent Contributor
timestamp: December 31, 2019, 06:59:53 pm
content: For a box like that silicon adhesive would probably work quite nicely. Most of your examples would probably be welded.

author: thm_w
author_rank: Super Contributor
timestamp: December 31, 2019, 09:49:48 pm
content: Some of the examples you've given do not need to be waterproof and super glue is unlikely to make a waterproof seal, unless the case fit is already air tight.Silicone would be waterproof but unsure of strength, depends on the fit. Fully silicone potted is an option as well.ABS solvent maybe, if you can figure out how to apply it consistently.I would try a few options yourself, if you are able, the cost of glue is not much.

author: Gribo
author_rank: Frequent Contributor
timestamp: December 31, 2019, 10:45:41 pm
content: If you can modify the design, use a groove with soft silicon gasket inside it. This way, you don't really need adhesive and can use machine screws with inserts.You will have to design the plastics to support ultrasonic welding, this is not trivial.What IP level do you want to achieve?

author: Cerebus
author_rank: Super Contributor
timestamp: December 31, 2019, 10:46:20 pm
content: Solvent welding is the way to go unless you're planning a long enough production run to justify the tooling for ultrasonic welding. You can get solvent 'glue' for ABS almost everywhere and it's a pretty fool proof process. A well made solvent weld will be close to the intrinsic strength of the material.
Best Vision system for light industrial robot - Page 1
Forum section: electronics / general

author: Reckless
author_rank: Frequent Contributor
timestamp: December 15, 2019, 07:42:08 am
content: Before going to ebay and looking up cognex vision systems I was hoping to find a cheaper, easier, and simpler alternative. Are there any other systems I should be looking at for a beginner?

author: forrestc
author_rank: Unknown
timestamp: December 15, 2019, 07:54:07 am
content: Quote from: Reckless on December 15, 2019, 07:42:08 amDepending on what you're looking for, OpenCV may be a good choice. I've used it in the past for some basic recognition tasks.It does require some programming though (typically in Python). There are a lot of tutorials on youtube. There are also quite a few additional libraries out there which supplement the capabilities.I also recently became aware of ros (see ros.org) which is specifically oriented toward robotics and vision - it uses opencv under the hood. I haven't used this at all, and I don't know how easy it is to use...

author: Reckless
author_rank: Frequent Contributor
timestamp: December 15, 2019, 10:15:20 am
content: Thanks, I will look into both.

author: H.O
author_rank: Frequent Contributor
timestamp: December 15, 2019, 11:53:44 am
content: Roborealm is another option if you don't need a stand-alone unit - which I suppose you don't if OpenCV would work.It's not free though and their pricing seems to fluctuate a bit depending on when you look. Currently it's $500, it was not near that a few years ago.Then you have the CMUCam5/PixyCAM but it might be more hobby oriented than what you're looking for - I don't know.

author: Smallsmt
author_rank: Frequent Contributor
timestamp: December 27, 2019, 12:53:06 pm
content: Hi Reckless,checkhttps://www.pyimagesearch.com/for a good source of computer vision related education material.A Raspi 4 plus camera is a good starting point.If you wan't more power use the nvidia jetson board.https://www.nvidia.com/de-de/autonomous-machines/embedded-systems/Really small solution is the Jevois camera system.http://www.jevois.org/RegardsMichael
TVM920 maintenance - Page 1
Forum section: electronics / general

author: ar__systems
author_rank: Frequent Contributor
timestamp: December 23, 2019, 03:42:06 pm
content: Last week i suffered a setback - the Y axis shaft on the left side snapped. As can be seen on the picture, it is snapped along the retaining clip groove.Rather than waiting for replacement from QIHE, I want to order stock 10mm shaft from McMaster and cut it to length. They offer several different steel types, and I have no idea which one to choose. They have:1566 Carbon Steel316 Stainless Steel4140 Alloy SteelAny help would be appreciated.Also I'm wondering if the retaining clips are really necessary, and if yes, why?Finally, why would this part fail in the first place, and is there anything I could do to prevent that from happening again?

author: ttt
author_rank: Regular Contributor
timestamp: December 25, 2019, 11:39:50 pm
content: I would go with the Carbon Steel option. Make sure the shafts are ground _and_ polished. Stainless is generally not recommended if your holding blocks are made out of aluminum as the two metals can potentially react with each other. Though it might not really matter in a climate controlled environment. The Alloy Steel is overkill for indoor use.McMaster sells shafts with grooves made to order:https://www.mcmaster.com/5930N118Not sure how much time&money that will safe you though. Probably faster&cheaper to get a DHL delivery from QIHE.There are high forces on these shafts; it's very likely that these grooves are there to prevent gradual shifting especially when the set screws come loose. Of course they also represent weak points like you experienced. This is probably what happened in your case: the set screws (on the holding blocks) where not tight enough which means there were high forces on these clips.
CL Feeder Air Valve, alternatives? - Page 1
Forum section: electronics / general

author: MR
author_rank: Regular Contributor
timestamp: October 29, 2019, 04:15:14 pm
content: Hi,I see that many CL Feeder Adapter use Koganei Air ValvesEg. Koganei 010E1-32w, can anyone recommend alternative switches, maybe from Festo in Europe? Default state should be closed of course.

author: Reckless
author_rank: Frequent Contributor
timestamp: October 30, 2019, 05:53:55 am
content: Are Koganei air valves faulty? I need to order some CL feeders soon

author: MR
author_rank: Regular Contributor
timestamp: October 30, 2019, 06:23:01 am
content: I don't think that there's anything wrong with them, but it's not so easy to obtain one item in Europe just for testing... (it takes quite some time until it would arrive).If you know a source in Europe which has them in stock I'd be happy to know about it.Festo is just easier to buy in Europe...If it won't work out until January in Europe I'll build it in Taiwan anyway.

author: MR
author_rank: Regular Contributor
timestamp: January 06, 2020, 10:54:11 am
content: I have ordered the block from China, it seems to be a used block (maybe/hopefully serviced).Doing that connector by yourself is not that easy.The Block is using G010HE1-5W valves attached to an extruded G010M20F-21W block (all from Koganei).I have ordered a single valve before - and it would be tricky to install it.Not the mounting plate is the expensive part - the valve and valve bar is. For sure there are cheaper possibilities out there but how long will they last? The valve parts are the essential parts of a stable and reliable system.I will integrate the block within the next months (I'm just busy with other projects at the moment). Overall that system seems to be much better than the Mechatronika Sp.J. blockfeeders.
CE certification in China - Page 1
Forum section: electronics / general

author: Dingo
author_rank: Newbie
timestamp: December 21, 2019, 07:09:07 pm
content: Does anyone know if there are any legit CE test labs in China / Shenzhen - or is CE certification required to be perform the EU itself?

author: doppelgrau
author_rank: Contributor
timestamp: December 21, 2019, 08:55:07 pm
content: Without knowledge on the Shenzhen/China test labs, main question: Does your product really need a certification from a notified body or do you "only" need help with the selft-certification?If you only need self-certification, you can definitively use labs outside the EU (only need to find one with experience).

author: Mangozac
author_rank: Frequent Contributor
timestamp: December 22, 2019, 11:55:25 pm
content: As noted by the first response, the way you've formed your question indicates that perhaps you need to get a better understanding of what CE certification is first.There are plenty of legitimate, capable test labs in China who can do tests to particular European standards for you. Exactly what tests you require depend on the product you plan to sell but in addition to such "type" testing there are other aspects of CE that come down to your supply chain management (such as RoHS). Although some equipment needs to be tested by a "notified body" (i.e. a test lab who is specially accredited), most typical electrical and electronic devices do not have this requirement.At the end of the day, your CE certification is essentially a self-signed declaration of conformity, so what you most likely need is guidance on how to ensure that you have covered all of your legal compliance requirements. There is plenty of information online and it is possible to work it out yourself but it does require a lot of research and learning quite a bit of the terminology.
New solder paste formula  - Page 1
Forum section: electronics / general

author: kylehunter
author_rank: Regular Contributor
timestamp: December 19, 2019, 01:22:12 am
content: Hi all. Posted over on smtnet about some defects we were having with a specific LED board. Seems like one of the potential causes is due to cheap China LEDs, and potentially poor PCB finish, along with maybe bumping up the reflow temperature.We are currently using Kester EP256. We don't have the ability to clean the boards, so it has to be a flux that can stay on the board. Ideally I'd like to stay with Kester, since they are readily available.EP256HA is a true "no-clean" flux, but is apparently a more aggressive chemistry.R231 is a RMA based paste. We have never used any rosin based flux before. Kester says it doesn't have to be cleaned.What are your thoughts on the RMA vs HA no-clean based pastes? I know that the RMA will solder better, but will have more residue. But how much more, and it should be completely inert, more-so even than "no-clean" right?Thanks a lot for any suggestions, it's really confusing with all the differences out there!
SFP-Module Case - Page 1
Forum section: electronics / general

author: shebu18
author_rank: Frequent Contributor
timestamp: January 06, 2020, 03:33:41 pm
content: Hello,Does somebody know where in Europe i could buy some SFP-module housings (not case or connector)?I need them for a project i am working on, where i use the SFP family of connectors for a custom solution but i can not find any manufacturer of the housing in europe.Thanks!

author: shebu18
author_rank: Frequent Contributor
timestamp: January 06, 2020, 06:54:13 pm
content: Thanks for the reply.Not only metal, but something that can be produced later in large scale. I also need to see the surface finish of the cage and discuss if the manufacturer can modify some aspects of the front of the case, as it will not be used as an ethernet transceiver.Buying and skinning a transceiver is again not a solution for the points mentioned above.
Vacuum vapor phase reflow how does it work? - Page 1
Forum section: electronics / general

author: Kjelt
author_rank: Super Contributor
timestamp: April 05, 2019, 10:06:05 pm
content: When viewing some presentations and YT videos about Vacuum vapor phase reflowing, I surely see the benefits of the vacuum preventing voids in the solder.However I was wondering how this works, does the vacuum not suck all the Galden vapor away ?Some machines raise the board than enclose the board and apply the vacuum during the cooling down phase. Others do it during the reflow stage.Does anyone have an understanding about this?

author: suj
author_rank: Regular Contributor
timestamp: December 04, 2019, 03:38:05 pm
content: A little old thread that I found looking for information on VPS using a vacuum. I also found a Rehm document with a simplified technology schematic that I think is answering your question. Their approach is different from the approach of Asscon and IBL. They used a single chamber to which, depending on the needs, they either inject galden or pump out air/vapor. When using a single chamber I'm not sure about energy efficiency (cyclical heating and cooling), but they also offer an inline solution divided into three chambers - pre-heating, main process chamber and cooling chamber.www.elettronicadpi.it/upload/condensox_en.pdf

author: Kjelt
author_rank: Super Contributor
timestamp: December 04, 2019, 04:53:52 pm
content: Thanks.Yes the pro machines have very elaborate equipment installed, they regain the Galden from sucking out the fumes while cooling and filtering and returning the remaining clean Galden back to the storage tank.That is the way to go for an industrial process but look at how expensive and large the machine then becomes. It will take up the entire livingroom.
(UK) Looking for small test jig manufacturers  - Page 1
Forum section: electronics / general

author: nali
author_rank: Frequent Contributor
timestamp: December 05, 2019, 10:13:51 am
content: HiDoes anyone have any opinions, recommendations or warnings for test jig suppliers in the UK?I have a board about 60x80mm which will need 25 pogo pins (one side) nothing higher speed than a UART @ 115k. I'm expecting a production run of maybe 1k, and I'll just need the mechanical jig as I already have the test board and software sorted.I've used Coda jigs before but would like to hear what anyone else thinks.Thanks

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: December 06, 2019, 06:58:35 pm
content: Since you already have the software and such figured out, and only need a thing to mechanically hold the pogos and the PCB to be tested, and I assume you have the exact build dimensions of the PCB, could you simply run up a design in CAD and 3D print one yourself? We do that all the time. Its fast and cheap.

author: forrestc
author_rank: Unknown
timestamp: December 08, 2019, 10:09:22 am
content: Quote from: nali on December 05, 2019, 10:13:51 amI'd recommend just spinning a PCB with appropriate sized holes to solder the pogo pins into. Use standoffs to orient your board.Seehttps://learn.adafruit.com/how-to-make-a-pogo-pin-test-jig/overviewfor an example. You can also use a toggle clamp or similar to hold the board in place.I've also had good luck with using a fixture clip such as those athttps://www.adafruit.com/product/2458to hold a board in place.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 08, 2019, 10:34:40 am
content: Just make some PCBs with the required holes & pads,and stack them with screw spacers. It will be quicker than communicating all the details to a third party manufacturer
home etching and manufcture of flat flex? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: November 30, 2019, 09:30:10 am
content: So flat flex PCB is often used in combination structures, great but its going to be a bastard to repair. say you want to repair a massively parallel ribbon connection, now its possible to expose copper out of kapton by using very fine sandpaper.but, what if you wanted to make a replacement ribbon bit yourself?what is the process used for copper to kapton adhesion that is resistant to acid etch? I don't think kapton tape will cut it here. So we can prevent weird hybrid unobtanium circuit board designs that mix flat flex and rigid pcbor if its something even weirder, like a sensor on the end of a piece?how are solder and rigid PCB junctions handled? (for hybrid boards)I know you can get japanese with it probobly and cut slivers of tape and position them under a microscope.. but I was hoping its possible to do with a mask process to make something close to the quality the manufacturer makesthe film must be obtainable, so I guess the main question is adhesive type.. I feel pessimistic about a manufacturer only future (components are bad enough). Even if its severely ghettorigged... pace sells all kinda of cool PCB repair tools, but with the flex circuits its starting to feel limitedare all the adhesives used manufacturer supplied? is it possible to use some kind of pourable glue? (don't see adhesive backed films being useful for multilayer flex pcb.. do they align laser cut gap filler kapton at the thickness of the copper to make the film adhesive work currently without bends around trace protrusions? so its literally layer on layer of tape?

author: GerardG
author_rank: Regular Contributor
timestamp: December 02, 2019, 02:18:53 pm
content: Hello Coppercone2,As like FR4 laminate you buy the Polyimide laminate with copper already attached.After etching the board you can then add (Kapton) Polyimide tape over the traces.You can also go for the option of printing your flex with a voltera V-One.The flex ink can be soldered with low temperature solder.https://printtec.nl/contents/nl/p4184_Voltera-V-One-pcb-printer-system.html

author: coppercone2
author_rank: Super Contributor
timestamp: December 02, 2019, 03:03:02 pm
content: what about multilayer flat PCB?

author: elecgear
author_rank: Newbie
timestamp: December 03, 2019, 01:58:36 am
content: Single-sided FPC with big width and spacing can be home etching, I think it's interesting, but just take care. How do you protect your traces and pads? It's hard to press a polyimide cover layer on the FPC.

author: coppercone2
author_rank: Super Contributor
timestamp: December 03, 2019, 02:26:05 am
content: maybe you temporarily bond it to a substrate to keep it strait so you can put a mask on it?
SMD Storage Cabinets (AUS) - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: December 01, 2019, 10:47:34 pm
content: Hi AllDoes anyone know of an Australian supplier that does SMD storage cabinets (controller environment)?So far I have Oritech:https://www.oritech.com.au/electronics-production-equipment/production-equipment-smt-storage.html?p=1
HDI PCB manufacturer recommendations - Page 1
Forum section: electronics / general

author: nexely
author_rank: Newbie
timestamp: December 26, 2019, 12:05:14 am
content: Dear members, I am seeking advice for a reliable quality HDI manufacturer. Searched for reddit channels, google, eevblog and still have no clarityWhat I am looking for:Asia or Europe based, with capabilities to manufacture prototype and scale to mid-volume production.Good quality for 6 layers HDI, 4/4 mil traces, 0.25 mm min holes, controlled impedance.Any advice and experience sharing highly appreciated.

author: asmi
author_rank: Super Contributor
timestamp: December 28, 2019, 02:17:05 am
content: Quote from: nexely on December 26, 2019, 12:05:14 amThis is not HDI. Not anymore. OurPCB/WellPCB can do down to 3/3 mil and 0.15 mm (mechanical) vias. And they are fairly cheap too. See my thread here:https://www.eevblog.com/forum/manufacture/ourpcb-affordable-multi-layer-board-manufacturer-my-experience/

author: exmadscientist
author_rank: Frequent Contributor
timestamp: December 28, 2019, 09:25:23 am
content: Saying "HDI" kind of implies laser microvias, or at the very least small (<6mil ~ 0.15mm) buried/blind vias. I agree with @asmi that 0.25mm/10mil min drill is really not HDI, unless there is also some kind of via stacking going on. Just about any midrange fab should be able to meet that spec.If you need true HDI, I'd look at Wuerth out of Germany. I don't know how bad their pricing will be for mid-volume production but they will certainly be able to do the job.

author: Siwastaja
author_rank: Super Contributor
timestamp: December 29, 2019, 01:44:02 pm
content: 4/4 mils and 0.25mm holes is not HDI and is easily done by most cheap manufacturers. Look at pcbshopper.com. JLCPCB and PCBWay are examples of very well known and widely used Chinese manufacturers.

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: December 29, 2019, 03:43:22 pm
content: In the UK pcb manufacture prices are extortionate.So I buy from JLCPCB or PCBWAY at a fraction of the UK price.
DIY Silkscreen (Paint??) - Page 1
Forum section: electronics / general

author: ricko_uk
author_rank: Super Contributor
timestamp: November 30, 2019, 03:42:15 pm
content: Hi,we have to modify some symbols on a PCB silkscreen. Which means we have to remove a couple and add few more. It is only on few boards so we can do it manually in house.1) Are there "silkscreen paints" that can be used to make a white silkscreen?2) does anybody know how to remove it without damaging the soldermask?Thanks

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: December 01, 2019, 10:09:19 pm
content: You can find something on farnell/element14https://au.element14.com/w/c/chemicals-adhesives/paints-coatings?coating-colour=whiteMaybe this:https://au.element14.com/multicomp/mc002958/conformal-coating-5ml-white/dp/2917607
Footprint / pattern for stack-up check? - Page 1
Forum section: electronics / general

author: alanambrose
author_rank: Frequent Contributor
timestamp: November 27, 2019, 12:39:07 pm
content: I remember seeing in one of Dave's tear down videos of some old HP gear (if I remember correctly) that the designers had put a neat footprint on the PCB so they could double check the layer stack-up after it came back from the fab. Anyone have any clues as to what that might look like? I would like to use a similar pattern.TIA, Alan

author: thm_w
author_rank: Super Contributor
timestamp: November 27, 2019, 09:30:54 pm
content: Put text '1' on top copper layer, '2' on second layer, etc.https://www.quora.com/How-do-I-find-the-number-of-a-PCB-layer-identification-by-visual-inspection

author: Kasper
author_rank: Frequent Contributor
timestamp: November 27, 2019, 09:40:53 pm
content: Make a rectangle and make sure there is no soldermask or copper in it except for a number on each layer. Spread the numbers out so they don't obstruct the view of each other.For negative layers (probably soldermask and power planes) place fills to remove the material.

author: alanambrose
author_rank: Frequent Contributor
timestamp: November 29, 2019, 09:03:06 am
content: OK many thanks, exactly what I was looking for...
Procurement agents in China? - Page 1
Forum section: electronics / general

author: V_King
author_rank: Regular Contributor
timestamp: November 26, 2019, 08:59:03 am
content: Hello,I started a new project, which requires sourcing various industrial components from China manufacturers (load cells, displacement transducers, other bits and bobs). I tried alibaba and it is a hard work and more like a kinder garden than a professional sourcing platform.I have experience with manufacturing agent houses for the mechanical components, which assist with all the enquiries in English, deal with suppliers, assure all the compliance documentation are in order etc etc. And for that they charge a commission or a fee. And I am happy to pay it if I can build confidence in the person I am dealing with.Is anybody able to recommend a familiar agent/company based in EU or far east familiar to the above described, working in industrial controls component sourcing and supply from China? to clarify I am not interested in the Chinese manufacturer's distributors, charging the 10x for the same part, just with a graduate sales engineer knocking on my door every month.Thanks

author: ebclr
author_rank: Super Contributor
timestamp: November 26, 2019, 12:06:44 pm
content: "just with a graduate sales engineer knocking on my door every month."On this condition, you will have EU prices, not China prices

author: V_King
author_rank: Regular Contributor
timestamp: November 26, 2019, 12:57:13 pm
content: Quote from: ebclr on November 26, 2019, 12:06:44 pmI am sorry I do not understand what are you trying to say above.
Pick and Place machine - which sub $10K machines have repair center in USA? - Page 1
Forum section: electronics / general

author: Merlysys
author_rank: Regular Contributor
timestamp: January 31, 2018, 07:01:34 pm
content: Shopping for a PnP, for small runs only.So you buy one of these (mostly) Chinese machines, like the Neoden or Qihe.One day it suddenly doesn't work, you rule out mechanical problems and think it is (one of) the circuit board.How would you proceed to fix it if the problem can only be fixed by getting a replacement board from the manufacturer?Do any of them have a local rep?If you ask the manufacturer to send a board (from China) how do you know which board to request?Will they send the board before receiving bad one(s)?

author: Tonny-NeoDen
author_rank: Contributor
timestamp: November 18, 2019, 08:06:56 am
content: Hi Merlysys,NeoDen has professional after-sell persons and they will follow up and try to confirm the problem as soon as we can.If need replace any parts,Neoden will send the replace parts via International Express like DHL,Fedex,etc.(during warranty.Neoden cover all cost;exceed the warranty,Neoden will charge at our cost).We have no local rep.in Canada until now.No need send the bad one back before send you the new part,but like feeders,if your have large broken quantities,pls help send back to us and we will see if we can fix them.Tony-neoden

author: IconicPCB
author_rank: Super Contributor
timestamp: November 18, 2019, 10:48:40 am
content: Smallsmt have a rep in USA.http://rcspnp.com/

author: Reckless
author_rank: Frequent Contributor
timestamp: November 18, 2019, 02:25:51 pm
content: i would recommend a used universal instruments corporation gsm as its cheaper, works better and everyone is familiar with it. Only issue is using outdated os2 software but very reliable. They will not die and tons of spares on the market for cheap. Very heavy which makes it super planted. They give phone support for $500 one time registration.

author: Mangozac
author_rank: Frequent Contributor
timestamp: November 18, 2019, 09:20:14 pm
content: Quote from: Merlysys on January 31, 2018, 07:01:34 pmSend them a photo?If you need a part urgently air freight can be as fast as a couple of days so I don't think getting replacements is too bad.The advantage of the Chinese machines that I can see is that the majority of the parts are readily available off the shelf from various suppliers. Parts from 20 year old western machines are largely obsolete and no longer supported by the manufacturer, so if/when they fail finding replacements can be tricky and expensive.

author: GerardG
author_rank: Regular Contributor
timestamp: November 20, 2019, 03:22:10 pm
content: Hello,Please take a look at this one.https://neodenusa.com/smt-pick-and-placeUSA basedBest regards,Gerard
Flux recommendation - Page 1
Forum section: electronics / general

author: SeoulBigChris
author_rank: Regular Contributor
timestamp: September 14, 2019, 12:44:29 am
content: I’m in need of flux, and embarrassingly I’ve never bought it myself. It was always bought by other folks. This would be used for hand prototype assembly and rework. Say a flux pen and a small bottle of liquid flux - I used to have a small squeeze bottle with a steel “spout” almost like a hypodermic needle, which was lost in my last laboratory move. What brands or types do you recommend?

author: Rerouter
author_rank: Super Contributor
timestamp: September 14, 2019, 12:48:49 am
content: Not sure about suppliers in Korea, but I would recommend a gel flux syringe, that way when you put it on a pad, it stays put until you heat it.e.g. like thishttps://www.jaycar.com.au/solder-flux-gel-10g-syringe/p/NS3039

author: MarkF
author_rank: Super Contributor
timestamp: September 14, 2019, 02:39:50 am
content: I ordered this from Amazon:https://www.amazon.com/gp/product/B0742GFVZ7/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1I have not tried it yet.But, it took 4 weeks to get it (from Korea).Here is a comparison video:

author: xavier60
author_rank: Super Contributor
timestamp: November 28, 2019, 11:45:36 pm
content: Quote from: Rerouter on September 14, 2019, 12:48:49 amThis is interesting, Jaycar stocks Deoxit brand flux,https://www.jaycar.com.au/solder-flux-paste-56g-tub/p/NS3070?utm_term=product&utm_source=criteo&utm_medium=retargeting&utm_campaign=lowerfunnelFor my applications, a solder flux must not cause too much leakage. Example, AMTECH NC-559-ASM caused me problems with high voltage IGBT driver ICs.
looking for PCB manufactor with bakelite option - Page 1
Forum section: electronics / general

author: mancausoft
author_rank: Contributor
timestamp: November 09, 2019, 06:41:13 pm
content: I know that bakelite PCB is very bad, it's not a matter of how much it will cost...I have in my mind a project of rebuild a old circuit using the same material of the original,the look is important and the original had the bakelite pcb exposed...For the prototype i can etch the pcb... but if this project will go after andi need to produce more I want to know the option in the market

author: Ian.M
author_rank: Super Contributor
timestamp: November 09, 2019, 07:52:28 pm
content: Modern phenolic SRBP PCBs don't look anything like antique Bakelite ones, nor does modern solder mask and silk-screening resemble the lacquer and board markings on those old boards. Post a good closeup of the actual antique board you are trying to clone or at least one of the same vintage!

author: IconicPCB
author_rank: Super Contributor
timestamp: November 09, 2019, 08:06:52 pm
content: In the paper based laminate material in use now you havea few options.These arePF resin (XPC, FR1, FR2)Epoxy resin (FE-3)Polyester resinpaper based laminates.Best to talk to your PCB shop and see what they can offer.

author: mancausoft
author_rank: Contributor
timestamp: November 09, 2019, 08:42:12 pm
content: Typical old style Bakelite board (brown)1 layer bottom, no solder mask, silk-screening on toplike:https://www.aliexpress.com/item/32380164740.htmlBakelite with one copper side to be hatched is easy to found...I was looking for a service that offers the creation of pcb with this "style" (like jlcpcb and similar, even for medium quantity, not only for prototype)

author: jmelson
author_rank: Super Contributor
timestamp: November 11, 2019, 12:04:33 am
content: Quote from: mancausoft on November 09, 2019, 06:41:13 pmI think PC board manufacturers can get other colors of substrate from the traditional green.Jon

author: tautech
author_rank: Super Contributor
timestamp: November 20, 2019, 07:57:17 am
content: Quote from: mancausoft on November 09, 2019, 08:42:12 pmNope, it'sFR2like IconicPCB said.Some options here:https://www.aliexpress.com/store/group/PCB-Board-And-Drill/908964_211583801.html?spm=a2g0o.detail.1000023.1.1cfd1688DP1RTG
SLA 3d printed stencil - Page 1
Forum section: electronics / general

author: pisoiu
author_rank: Regular Contributor
timestamp: November 25, 2019, 08:22:34 pm
content: Hi,Currently, for prototyping I am using an european company (pcbpool) which does offer 'free' stainless stencil but they are quite expensive overall.For some low budget projects I may use other pcb suppliers but they may not offer stencil. Ordering a separate stainless stencil may not be feasible, as many of my low budget projects are also low qty.I purchased recently a 3d sla/dlp printer, still waiting to arrive.So the obvious question is: has anyone tried to use a 3d printed stencil (strictly SLA/DLP printed, not FDM or other methods) for paste deposition on pcbs? I am perfectly aware that I will not have quality or durability of a stainless stencil but if it last few prints for a prototype, may be enough for me.

author: spongle
author_rank: Regular Contributor
timestamp: November 25, 2019, 09:18:45 pm
content: use JLCpcb. $2 boards, $5 stencil, $30 DHL shipping. Have them trim the stencil to 150mm or less and it will ship free in the same box.no, I don't think you could even remove a SLA printed stencil from the base block without it shattering.

author: spongle
author_rank: Regular Contributor
timestamp: November 25, 2019, 09:21:59 pm
content: If you must have a DIY solution, laser cut mylar is workable, and you could probably make one even with one of those aliexpress laser engravers. But expect to waste a lot of time dialing in aperture sizes.

author: kizmit99
author_rank: Regular Contributor
timestamp: November 26, 2019, 01:04:38 am
content: Quote from: spongle on November 25, 2019, 09:18:45 pmThat is a great tip!When I've ordered boards from them with stencils I was shocked at the added shipping cost (until you realize how big their 'smallest' stencil size is. I never noticed their custom size option, or just assumed it would cost more not less.I will definitely give this a try on my next PCB.

author: ebclr
author_rank: Super Contributor
timestamp: November 26, 2019, 02:25:12 am
content: https://hackaday.com/2016/02/08/solder-stencils-with-a-3d-printer/
JLCPCB design rules and stackups for Altium Designer - Page 1
Forum section: electronics / general

author: ayberkozgur
author_rank: Newbie
timestamp: November 18, 2019, 09:45:08 am
content: Some time ago I compiled design rules and layer stackups for JLCPCB in order to reuse them and keep them under version control for my future projects. Since the design rules available at JLCPCB contain clear mistakes (e.g hole to trace clearance, other clearances) and don't cover 2-layer boards, I'd like to post my effort here so that they may become useful to others as well:https://github.com/ayberkozgur/jlcpcb-design-rules-stackupsPlease let me know if you find any mistakes.

author: rs20
author_rank: Super Contributor
timestamp: November 18, 2019, 09:53:16 am
content: Shouldn't this live underhttps://www.eevblog.com/forum/altium/?

author: ayberkozgur
author_rank: Newbie
timestamp: November 18, 2019, 10:09:45 am
content: Quote from: rs20 on November 18, 2019, 09:53:16 amI guess it could be both? Here since JLCPCB-specific and there since Altium Designer-specific. I don't mind if it's moved there.