hybridfree/eevblog-posts huggingface dataset:
making testjig pusherplates for bed of nails testers - Page 1
Forum section: electronics / general

author: Dennis Von Guzzi
author_rank: Newbie
timestamp: November 24, 2021, 02:06:01 am
content: Good Afternoon,I've been trying make the inverse 3D image of a pcb with components to use as the pusherplate on a bed of nails testjig. I have a method but its not good, and is very time consuming.Does anyone have a tried and true way of doing this?What I've done so far is....In altium, open the 3D mech drawings and convert to VRML.Open the VRML in meshlab and export as STL.Then with a mesh editor, in my case tinkercad import the STL file, invert it and push it into a solid block.This is now my inverse image, but because there is so much detail in the 3D mech file the stl file is full of voids and surfaces that don't form a proper inverted 3D image of the pcb, and Cura gives many errors messages about the object your've created.So, I can simplify the STL of the original 3D pcb to remove detail, but this is the part that takes hours. I do this by blocking out the components into rectangles and boxes.So, back to my question.Is there a better way?ThanksD

author: jmelson
author_rank: Super Contributor
timestamp: November 24, 2021, 04:10:02 pm
content: Quote from: Dennis Von Guzzi on November 24, 2021, 02:06:01 amDon't try to make an exact relief of the whole PCB, just do the edge and a few points at the interior that are free of components.I have made several bed of nails fixtures, and generally only apply pressure to the edges. This seems to work fine.Jon

author: Dennis Von Guzzi
author_rank: Newbie
timestamp: November 24, 2021, 06:58:35 pm
content: Yes, that's the conclusion I've come to also.The 3D mechanical model is so accurate and the detail so good that it actually hinders you.One day Altium may have this feature built in.ThanksDennis
Searching for high current smd bus bar component - Page 1
Forum section: electronics / general

author: Schobi
author_rank: Newbie
timestamp: November 16, 2021, 08:04:23 pm
content: Hi,There is a video about the 12V electronics in recent Tesla vehicles from Ingeneerixhttps://youtu.be/fUCgLCbX_18The Pcb replaces traditional relais and fuse boxes and handles high current. For supporting these high currents, the pcb is equipped with additional bus bars along the high current path. (so far so good)However, it is not a continuous bus bar, but broken into many pieces.I would guess they are about 1 inch long and arranged neatly - so no hand soldering?They are surface mount - so maybe suitable for the same assembly/soldering process?What component is this?Where can I get them and who supports assembly of these?

author: penfold
author_rank: Frequent Contributor
timestamp: November 16, 2021, 08:32:39 pm
content: They may be custom or semi-custom, I'm pretty sure I stumbled across some that were off the shelf in reference to another post, but a quick search hasn't brought much up... pretty sure there are some standard ones about given a bit more searching, often go by the name of board-stiffeners if that helps - probably less so for SMT types.https://www.e-fab.com/products/stiffeners-busbars/is one example of a "kinda custom" version. It's pretty trivial for a big manufacturer to have some cut out of copper though.

author: Schobi
author_rank: Newbie
timestamp: November 16, 2021, 08:50:49 pm
content: I've seen those bus barsThe e-fab website hints to a custom bent piece of copper, through hole mounting and an additional assembly step.The Tesla example looks more like a tape&reel part that can be picked and placed. (with the disadvantage of lower current as it is not continuous).

author: penfold
author_rank: Frequent Contributor
timestamp: November 16, 2021, 09:24:26 pm
content: Harwin SMT Jumper linksis the ones I was trying to remember

author: Schobi
author_rank: Newbie
timestamp: November 16, 2021, 10:06:21 pm
content: Great - thanks!This is close with 10A and available as Tape and Reel
Manufacturers with Black PCB Substrate? - Page 1
Forum section: electronics / general

author: Dave8266
author_rank: Contributor
timestamp: November 08, 2021, 05:58:28 pm
content: Aside from OSH Park, are there any other PCB fabricators that manufacture on an actual black PCB substrate, and not just use a black solder mask? I'm working on a PCB that is half functional half decorative (a piece that the user interacts with), and all of the edges are on display.We've had great results from OSH Park for our prototypes, but taking care of the mouse bites would kill us at quantity, and they don't offer fully-routed (or medium run, the prerequisite) options with After Dark orders.Thanks in advance!

author: Fronberry
author_rank: Contributor
timestamp: November 12, 2021, 03:49:55 am
content: Maybe PFTE/Teflon?

author: trophosphere
author_rank: Frequent Contributor
timestamp: November 15, 2021, 07:34:50 pm
content: I was looking around on various PCB manufacturer websites and found thatPCBWayhas something which may fit your specification. They have options for transparent solder mask as well as "Black FR4 (black core)" under the Additional Options section. Don't know if it is an exact match to OSHPark's offering though so may need to put in a small order first. Sadly, the Black FR4 option seems to be restricted to 2 layers only.

author: xavier60
author_rank: Super Contributor
timestamp: November 15, 2021, 11:43:26 pm
content: I would like to try transparent solder mask with standard FR4. PCBWay have the option only with their expensive Advanced PCBs.
need help identifying silicone substance - Page 1
Forum section: electronics / general

author: vjekobalas
author_rank: Regular Contributor
timestamp: November 14, 2021, 03:57:43 pm
content: I may have placed my thread:https://www.eevblog.com/forum/beginners/searching-for-silicone-type-sealantglue-reddishorange-color/in the wrong subforum.Would appreciate if someone could help in identifying what productthe silicone substance is so that I can put the plastic head together again.

author: AmnevaR
author_rank: Contributor
timestamp: November 14, 2021, 04:15:45 pm
content: Looks just like the regular variety of high temperature RTV (Room Temperature Vulcanization) silicone.Link as an example:https://www.ebay.com/itm/324520789130?epid=2254565798&hash=item4b8ef2448a:g:fQQAAOSwABBfDKc0update: I have read your other thread and I still think that about any RTV silicone bought from an automotive shop will work just fine. The oil resistance should not be a problem, this silicone is used for making gaskets for cars.

author: vjekobalas
author_rank: Regular Contributor
timestamp: November 15, 2021, 05:54:08 pm
content: Thanks, will try an RTV silicone.
LCD Display panel/camera - Page 1
Forum section: electronics / general

author: roberthansjorg
author_rank: Newbie
timestamp: November 12, 2021, 05:53:08 pm
content: Hi all,I've got an old camera where the character lcd display is de laminating.It's 18.5mm x 14.0 mm in size.Nothing special about this lcd I'm sure. Black characters/numbers againsta green background.I can provide a sample.I'd like to know where I could get more of them made. The camera is Japanese made.It would be helpful to know who makes lcd displays for cameras anyway. The smallerdisplays.Robert
where is the centroid center? - Page 1
Forum section: electronics / general

author: phil from seattle
author_rank: Super Contributor
timestamp: October 29, 2021, 08:57:37 pm
content: I've seen a number of SMD datasheets that don't call out an explicit center and have now run into this. I'm trying to use a MicroXNJ USB Micro A/B connector in a design and am having trouble with the proper CPL file position. The part isthis one. The second page has a very nice footprint drawing except no specification of the center.Thanks in advancePhil

author: phil from seattle
author_rank: Super Contributor
timestamp: October 29, 2021, 10:19:14 pm
content: I solved the short term problem by using the easyeda footprint to figure out the center. There was no obvious correlation to the datasheet footprint. Hopefully it is right. Only a small run so not a lot of money wasted if bad but kind of frustrating.It seems to be pretty common that a P-n-P center is not included in connector datasheets. I feel like I'm missing something obvious.

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: October 30, 2021, 01:26:18 am
content: From my experience, the center point is the exactly the center between the furthest (on both X & Y direction) of what the PNP vision camera is looking for: the shiny pins/legs and not the body. I used USB connector for both micro and type-C and that is how I drew the center of the component rather than taking the account of the entire body.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: October 30, 2021, 04:20:04 am
content: There is no universally agreed upon standard for things like this.Recently there was a topic about this on the KiCad user forum that points out some differences:https://forum.kicad.info/t/is-there-no-standard-for-pick-and-place/31608

author: phil from seattle
author_rank: Super Contributor
timestamp: October 30, 2021, 02:37:27 pm
content: Quote from: Doctorandus_P on October 30, 2021, 04:20:04 amThis is a slightly different problem from the rotation issue. Some datasheets do not specifically call out the center of the part so you don't know where to specify the position in the CPL file. I've seen some SMD switches and pin header datasheets as well as USB connectors like that. How did the easyeda library creators know where the center is?

author: Feynman
author_rank: Regular Contributor
timestamp: October 30, 2021, 06:42:55 pm
content: Since there is no real standard for anything (or many different standards, e. g. for pin 1 position), your XY-file will most likely go through a manual process anyway. Especially irregular shaped components like connectors will be looked at closer. So when there is no information in the datasheet you'll be fine by guessing where the center of gravity might be most of the time. There should be a flat surface, of course.
Recommendations for Chinese prototype/PCB assembly companies that use JLCPCB? - Page 1
Forum section: electronics / general

author: radiostuff
author_rank: Contributor
timestamp: October 28, 2021, 08:34:15 pm
content: Can anyone recommend a Chinese PCB assembly company that uses JLCPCB for their PCBs? I've found JLC to provide higher quality PCBs at much shorter lead times than the suppliers that various assembly houses use. Whenever I ask PCBA companies to use JLC instead of their own supplier, they balk at the request.Yes, JLC does offer assembly services, but it is limited to their stocked parts and they do not allow customers to provide components.

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: October 28, 2021, 11:53:01 pm
content: The PCBA factory I used in Shenzhen (Moko Technology) uses JLCPCB when requested. But they do mentioned they don't really use them usually due to the "prototype" status I believe all the industry player in China labelled JLC as such.

author: thm_w
author_rank: Super Contributor
timestamp: October 29, 2021, 12:26:05 am
content: If they are willing to accept whatever mailed PCBs, you can order for them and ship from JLC within china.Could be a huge pain in the ass though, as it will need to match their panel requirements.https://www.jlc.com/?s=washould be the site.

author: radiostuff
author_rank: Contributor
timestamp: October 29, 2021, 12:38:50 am
content: @48X24X48X Do you use Moko for prototyping? How are they on lead time and price? I've dealt with them before, but I was always under the impression they are only interested in volume orders.

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: October 29, 2021, 12:56:39 am
content: Quote from: radiostuff on October 29, 2021, 12:38:50 amI used them for larger orders like 1K to 10K quantities while I manufacturer anything less than that on my own machine. Also, whenever my client's product requires very laborious testing, boxing, wire assembly, packaging, or need a fulfillment warehouse nearby them (like in Hong Kong for example as it doesn't make sense as I'm based in Malaysia). I do like the additional service to get certification like FCC and CE which made my life a lot easier than have to deal with the certification labs. But they do small order like few hundred too. They are a proper legit company as I visited their factory before albeit not very huge. Lead time is a bit hard for me to say because usually that depends on the components availability but if you are talking only about the physical process like assembly and testing, they are pretty quick within a week. I think their price is okay for the volume I'm talking about. Of course no one can go close to JLC's game.
Cable shielding "self closing" - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: October 27, 2021, 06:13:36 am
content: Hey AllCould someone please tell me the correct name for the "self closing" cable shielding in the attached picture?Would this be a custom item, or would it be something I can find on DigiKey/Mouser/Element14? If it's the latter then what are some MPN's I can search up?Lastly, for those that have used these in assemblies, did you find them having much of an impact during EMC/ESD testing?Cheers, Anton

author: edpalmer42
author_rank: Super Contributor
timestamp: October 27, 2021, 07:14:35 am
content: A Google search for 'rfi sleeving' or 'emi sleeving' shows typical braided sleeves, but also shows the kind you're looking for.Ed

author: thm_w
author_rank: Super Contributor
timestamp: October 27, 2021, 09:58:27 pm
content: The normal term is "split loom" but "split loom conductive" just seems to find solid metal housings.You'd want to do some of your own precompliance testing. If there are highish frequencies and currents traveling through that cable, and the shield is grounded, then yeah it could help.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: October 27, 2021, 11:13:35 pm
content: Quote from: edpalmer42 on October 27, 2021, 07:14:35 amQuote from: thm_w on October 27, 2021, 09:58:27 pmThanks for the help. Looks like these sort of shields are typically a custom solution, with the two big players being:https://hollandshielding.com/Cable-shielding-materials-shielded-entries-materialshttps://www.laird.com/products/enclosure-solutions/emi-tapes

author: edpalmer42
author_rank: Super Contributor
timestamp: October 27, 2021, 11:46:45 pm
content: Did you see this company?https://www.hilltop-products.co.uk/cable-sleeving-protection/braided-knitted-glass-sleevings/emi-seld-closing-shielding-wrap.html
ESD-safe PCB holder for rework (under Mantis Microscope) - Page 1
Forum section: electronics / general

author: forrestc
author_rank: Unknown
timestamp: October 22, 2021, 09:50:03 pm
content: We use a Mantis microscope on the rework bench. When soldering under the microscope, we find that the board needs to be elevated above the work surface in order for it to be ergonomic for the operator. Right now, they pile various things under the board, I think they're using a pair of 2x6's right now. Everyone would rather use something a bit more purpose-built.What is everyone else using for this? We're hoping for something which holds the board 3-4 inches above the work surface and is able to hold the board such that it is parallel to the work surface.Looking at the options available show several different styles are available, but fewer of them seem to be suitable for an ESD protected area and I'm skeptical of the ease of use of some of the remaining options.

author: jc101
author_rank: Frequent Contributor
timestamp: October 23, 2021, 11:34:41 am
content: As my boards are not that large, I use something like this with some ESD mat on the top. The whole thing is connected via an antistatic ground lead to a bench stud, as is the mat stuck on top.If find it handy to move the board up and down into focus to leave the mantis at a comfortable height.https://www.amazon.co.uk/dp/B08HCW1FPL/ref=cm_sw_em_r_mt_dp_STT9FMQJKEDMKS977QX5

author: bson
author_rank: Unknown
timestamp: October 24, 2021, 01:28:19 am
content: How about PCBite? I have the 4002 kit with a small baseplate. It's all metal, so easy to ground.https://sensepeek.com/pcbite-kitsWill probably add some of the probe holders as well.

author: NorthGuy
author_rank: Super Contributor
timestamp: October 24, 2021, 02:42:17 pm
content: I use drill press vise. It's really solid. Doesn't work for bigger PCBs though.

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: October 24, 2021, 10:22:22 pm
content: If you have a 3D printer (and you should, get a Prusa MK3s), 3DXTech.com has ESD rated filament.
How eagle import cadence file - Page 1
Forum section: electronics / general

author: ansonbao
author_rank: Regular Contributor
timestamp: October 22, 2021, 10:00:21 am
content: HiIf design file by Cadence,how eagle import the file?

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 22, 2021, 03:11:20 pm
content: With an ASCII file that Cadence exports.
Castellated holes are for wussies.  I want castellated SLOTS !! - Page 1
Forum section: electronics / general

author: frogblender
author_rank: Regular Contributor
timestamp: October 21, 2021, 01:49:51 am
content: Anyone ever get castellated slots done? I want a portion of the edge of my PCB to be plated: just like a castellated hole, but wider.

author: Psi
author_rank: Super Contributor
timestamp: October 21, 2021, 02:03:31 am
content: I have seen castellated slots on pcbs, but never done any myself.You do castellated holes using normal holes with board outline going through them.So you should just be able to put a slot there in the same way.I don't see any issues.Just be aware they will charge extra for castellated holes/slots because the drill/router bit needs to be much newer/sharper to get clean cuts without tearing up the pads.

author: Kasper
author_rank: Frequent Contributor
timestamp: October 21, 2021, 02:50:15 am
content: It wasn't a slot but years ago I made a PCB to replace a AA battery and plating its ends worked fine. One end was similar to AA positive terminal, other end had 2 big semi circles that fit with coil spring of battery holder.

author: Feynman
author_rank: Regular Contributor
timestamp: October 21, 2021, 07:44:00 pm
content: Well you can plate the entire edge of a board if you wish to do so. You'll just need some space to hold your board in the panel e. g. with mouse bites.

author: daqq
author_rank: Super Contributor
timestamp: October 21, 2021, 07:51:14 pm
content: It's a normal technique, nothing magical really. Ask your PCB manufacturer on the details on how you should define them in your data.
Invitation to PCB manufacturers and assemblers - Page 1
Forum section: electronics / general

author: rea5245
author_rank: Frequent Contributor
timestamp: October 16, 2021, 05:09:18 pm
content: Hello to companies doing PCB fabrication and/or assembly:I run the the web site PCBShopper.com. It's a price comparison site for PCB manufacturing and assembly. Users enter their boards' specs and immediately get prices from multiple manufacturers.I don't charge manufacturers anything to be in the price comparison list. I put in hours of my own time to write code to query prices from their servers, and I put their companies' names in front of thousands of PCB purchasers, for free. I make money by selling ads, which manufacturers are under no obligation to buy.Over the last year, I've lost several companies in my price comparison lists. They left the business, or they changed their web sites such that I cannot get prices from them anymore.So I'm looking for a few new companies to add. I'm looking for companies that have easy, fast, documented web APIs that I can use to fetch prices. I'd like to find companies from all over the world - I already have several companies in China, and I'd like to get more from other Asian nations, Europe, the Americas, and Africa.I'm looking for a handful of new companies at most.If you'd like to work with me, please use the Contact Us page at PCBShopper.com.Thank you,Bob AlexanderPCBShopper.com
Common thickness of hard gold in edge connectors? - Page 1
Forum section: electronics / general

author: [Chrille]
author_rank: Contributor
timestamp: October 14, 2021, 07:31:03 am
content: Hi!I want to get a board manufactured and it has an edge connector. What is the typical thickness of the gold fingers of an expansion board (in μ")?Thanks!

author: SteveyG
author_rank: Unknown
timestamp: October 14, 2021, 08:45:27 am
content: 1 to 2 microns usually

author: Fronberry
author_rank: Contributor
timestamp: October 14, 2021, 07:10:46 pm
content: 30-60 μ" gold, plated over 100+μ" of nickel. Total thickness is ~.06 inches

author: [Chrille]
author_rank: Contributor
timestamp: October 16, 2021, 02:18:55 pm
content: Thanks!
PCB assembly with parts from Aliexpress - Page 1
Forum section: electronics / general

author: trytosolder
author_rank: Newbie
timestamp: October 14, 2021, 06:45:17 am
content: Hello, can you recommend a pcb manufacturer and assembly that could buy parts from Aliexpress?JLCPCB doesn't do thatI tried with Pcbway but they go crazy expensive with some parts. I also need DDP system (pre-paid import VAT).Thanks

author: wraper
author_rank: Unknown
timestamp: October 14, 2021, 06:53:12 am
content: Barely any Chinese companies do DDP. Also I don't suggest using parts from Aliexpress for assembly. Especially if you cannot inspect and test them first. There are tons of fake and recycled shit there.

author: trytosolder
author_rank: Newbie
timestamp: October 14, 2021, 06:58:07 am
content: Quote from: wraper on October 14, 2021, 06:53:12 ampcbway and jlcpcb do DDP. I need only a connector from Ali (proved quality). It's hard to manually solder.

author: wraper
author_rank: Unknown
timestamp: October 14, 2021, 07:14:24 am
content: JLCPCB does not accept parts from external sources AFAIK. But you can ask seller from Aliexpress is he can ship them to PCBway if you buy them. For purchases shipped within China, taobao is a better option though.
Yamaha Feeder electrical 12 / 16mm - Page 1
Forum section: electronics / general

author: MR
author_rank: Regular Contributor
timestamp: October 28, 2021, 11:23:37 pm
content: Hi,does anyone have electrical 12 / 16mm Yamaha feeders (or clones)?Could anyone take some pictures of those feeders, especially the motors and gearing?What's the width of those feeders?The 8mm feeders are well understood so far and the most expensive part seems to be the motors.
Need advice on a reasonable inexpenceive machine for laminating photo resist... - Page 1
Forum section: electronics / general

author: Uky
author_rank: Regular Contributor
timestamp: September 29, 2021, 07:39:45 am
content: Greetings Forum,When making circuit boards for myself, FR4 material with photo resist can be readily purchasedin hobbyshops nearby. But more exotic materials such as Teflon cannot. So I need tobuy a machine that can laminate blank boards with photo resist films.Can someone suggest a machine, not to expenceive that can be used for this in a smallhome lab?

author: jmelson
author_rank: Super Contributor
timestamp: October 03, 2021, 04:27:12 pm
content: I managed to snag a kepro dry film laminator made expressly for this purpose. It has two silicone-coated rollers with heating wire embedded in the silicone. One roller is driven by a gear motor, the other is spring loaded against the first roller. Since the unit only laminates one side of the board at a time, it seems the 2nd roller doesn't need to be so fancy. Maybe this info is helpful in selecting a commercial laminator that will work.Jon

author: wraper
author_rank: Unknown
timestamp: October 03, 2021, 04:32:55 pm
content: Office laminators work well for this, but you need to find one which will not choke at something as thick as PCB, some modification may be needed. With temperature adjustment preferable.
Makerspace pick and place line - Page 1
Forum section: electronics / general

author: jmw
author_rank: Frequent Contributor
timestamp: September 22, 2021, 05:13:29 pm
content: I have a membership at a space that has a wood and metal shop, with manual and CNC mills, lathes, and routers. You bring our own materials and tooling, but the machines are available for reservation after you've been checked out by an instructor. Is there any place like this for electronics assembly? Other than the economics of finding a location where there's enough interested people to recoup the investment in the equipment, would this be a viable way to do prototype assembly? I feel like I'd eventually learn a lot of practical DFM by seeing what works and doesn't on a line I had to operate.

author: doppelgrau
author_rank: Contributor
timestamp: September 22, 2021, 05:24:31 pm
content: I see the problem, that it is to specialized as an own makerspace.For prototypes often something to hold a stencil, good light, tweezers, an oven and maybe a stereo microscope is needed. This fits in too many hobbiest homes.If you start with a small PnP machine (e.g. Using OpenPnP), the problem with the parts beginn, to reduce the setup times you want to keep often used parts on the machine (reason why I programmed the HeapFeeder)...To sum it up: The Basisc setup can be easily added to an makerspace, the more complex one is IMHO nut really makerspace-friendly.

author: jmelson
author_rank: Super Contributor
timestamp: September 23, 2021, 02:31:51 am
content: TX/RX labs in Houston has a P&P machine. They do have a heavier focus on electronics than most makerspaces.You might contact one of their people and see how they are doing with it.Jon
Edsyn FL 112 flux performs badly - Page 1
Forum section: electronics / general

author: irdc
author_rank: Newbie
timestamp: September 24, 2021, 03:44:18 pm
content: Hi,I recently bought some Edsyn FL 112 flux as part of stocking up for an SMD project (I cannot find much information about this flux online, so I cannot link to that). Sadly, this flux appears to perform really badly with my SAC305-solder (Felder iso-core ultra-clear): lots of solder bridges that won't resolve and it just doesn't flow nicely.When in sheer desperation I grabbed a Kester #951 flux pen that was 15 years (!) out of date all my problems suddenly melted away: nice wetting, shiny joints (well, as much as SAC305 lets you) and easy removal of solder bridges (I mean, they're TSSOPs, of course there's going to be solder bridging).I've already approached the seller about this issue, but I'm wondering: anyone else having this problem? Is there something I'm doing wrong; too much flux maybe? Is my soldering iron too hot (I'm using 370 °C / 698 °F)? I'm admittedly a bit of a beginner, so I'm not totally discounting user error here.

author: m98
author_rank: Frequent Contributor
timestamp: September 24, 2021, 09:47:38 pm
content: 370 °C is a bit too hot. The flux will decompose and evaporate too quickly at this temperature. You might want to try a flux paste (Edsyn FL22, for example), works much better for rework as it won't fully evaporate while you work on the joint.Which soldering iron and tip are you currently using?Make sure the tip "fits" your soldering joint to facilitate good heat transfer. So no round or "micro-soldering"-tips, unless you absolutely need one. If you find yourself needing to crack up the temperature too high, chances are, you're either not making good contact, or the heat capacity of the tip isn't enough to keep up the temperature.

author: irdc
author_rank: Newbie
timestamp: September 25, 2021, 09:24:46 am
content: Quote from: m98 on September 24, 2021, 09:47:38 pmI was figuring as much. Either that or too cold (I mean, itisa flux intended for lead-free solder). I'll try some lower temperatures; maybe 320 °C or 300 °C.I'm still left wondering why the Kester worked as well as it did then…if anything, the Kester evaporated a whole lot more than the Edsyn. Maybe it's the ageing? 😉QuoteI'm using what is marked as a SkyTronic 703.050 but is also sold as theVelleman VTSSC30N, together with aBITC10N3 3mm slanted tip. Temperature transfer appears to be fine (as I said: soldering goes really well with the Kester).QuoteI'll probably eventually do that; I had already been considering switching to the CIF F42202 flux paste. Well, it's all learning by doing I guess 😊

author: wraper
author_rank: Unknown
timestamp: September 25, 2021, 09:28:06 am
content: 370 °C is completely fine for Lead-free soldering if you do the job fast.
Kayo A4 vs SMT550 - Page 1
Forum section: electronics / general

author: itsrealfast
author_rank: Contributor
timestamp: September 22, 2021, 02:58:56 pm
content: Hi guys,I know this is almost beating a dead horse with this topic but I am getting ready to pull the trigger on one of these manufactures.I'm getting a better deal buying the SMT550 but I read a few things that's making me change my mind. I'm on the fence with both right now.My fear is buying one over the other and getting screwedI would like to hear thoughts of machine, service, and support?Thanks again

author: SMTech
author_rank: Frequent Contributor
timestamp: September 22, 2021, 03:25:09 pm
content: Well the only way to truly kill this horse is to buy both and then tell everyone else who asks the same question your direct impressions as the only person who truly knows....

author: itsrealfast
author_rank: Contributor
timestamp: September 22, 2021, 06:41:21 pm
content: Quote from: SMTech on September 22, 2021, 03:25:09 pmI wish I can afford them both lol I gotta stick within my budgetThanks

author: alexaraujo
author_rank: Regular Contributor
timestamp: September 22, 2021, 11:04:10 pm
content: I bought directly from HWGC model HW-T6SG-64F identical to smt660 and I'm waiting for shipment to Brazil.I was also in doubt between Kayo and HWGC and I hope I chose the best option
Can I trust Heisener.com ? - Page 1
Forum section: electronics / general

author: jemangedeslolos
author_rank: Frequent Contributor
timestamp: September 13, 2021, 12:41:20 pm
content: Hello,I need to purshase very specific ( and expensive ! ) component. Even the manufacturer ( Analog Devices ) has only a few units in stock.Heisener.com has a large stock ( around 4000 ) and I need only 100 units.I didn't know this company before doing research on this component.Have you ever had the opportunity to order on this site? Is it serious and reliable ?Thank you for your help

author: pylo
author_rank: Regular Contributor
timestamp: September 13, 2021, 01:05:00 pm
content: Yes, they will deliver. They are one of those companies though who bought up dwindling supplies and are now selling their stock for 4x-20x price to rip off everybody affected by the current market situation. I guess one will buy from them when there is absolutely no other option and I cannot blame you, but otherwise I'd recommend to stay away from them.

author: jemangedeslolos
author_rank: Frequent Contributor
timestamp: September 15, 2021, 07:29:01 pm
content: Thank you pylo.I got feedback from them today....and you are right.The crossed out price is bullshit. They sent me a quote with a price X2 compared to the manufacturer's price....and X6 compared to their own crossed out price.But the manufacturer price is 3200$ / unit so X2 is a huge difference
A recyclable PCB substrate - Page 1
Forum section: electronics / general

author: 741
author_rank: Frequent Contributor
timestamp: September 08, 2021, 09:46:08 am
content: Found this, pretty impressive, also a bit worrying maybe to use for real?https://www.jivamaterials.com/

author: kylehunter
author_rank: Regular Contributor
timestamp: September 08, 2021, 07:50:12 pm
content: I'm sorry, but this seems hilarious!"Jiva is in the process of ensuring that Soluboard® is compatible with aqueous PCB fabrication processes. Jiva is also engineering Soluboard® to be resistant to high humidity environments.""The structure of Soluboard® and choice of polymer allows Soluboard® to delaminate when immersed into hot water. The plant-based fibres can be composted, the remaining solution of polymer can be disposed of using standard domestic waste water systems and the electronic components are then removed for recycling."So, they say it'll work with an aqueous cleaning process (hot water + detergent). Then, they say that it's recycled by using hot water.It's like these companies don't ever try to make it seem convincing...

author: Cerebus
author_rank: Super Contributor
timestamp: September 08, 2021, 11:33:45 pm
content: It's not ridiculous, it'll just be a question of degree. If we immerseyouin hot water for a while you're fine. If we immerse you in boiling water for a couple of hours you'll, erm, 'delaminate'.They've just said 'hot water' which is a bit imprecise and probably deliberately so to make them sound all green, planet friendly and generally shiny. If they said "In an autoclave at 150ºC for 36 hours" would you be less skeptical?

author: kylehunter
author_rank: Regular Contributor
timestamp: September 09, 2021, 12:12:15 am
content: Quote from: Cerebus on September 08, 2021, 11:33:45 pmLol, fair point. But, I still wouldn't trust something that will "survive" an aqueous cleaning process, but is recycled in the same manner, just a bit hotter and/or longer. Since it's not like it goes from perfect -> delaminated instantly. Who knows how much damage is done from the initial reflow/cleaning.

author: gcewing
author_rank: Regular Contributor
timestamp: September 12, 2021, 11:45:18 am
content: Seems to me there's already a material very similar to what they're describing, and has the advantage that it can be manufactured in solar-powered self-assembling production units.https://149366112.v2.pressablecdn.com/wp-content/uploads/2019/03/shutterstock_1693785667-1200x798.jpg

author: 741
author_rank: Frequent Contributor
timestamp: September 12, 2021, 11:59:55 am
content: That is an unusal link?I tried simply "pressablecdn.com", nothing, and no relevent hits either.Do you know what the company website is called by any chance?

author: Cerebus
author_rank: Super Contributor
timestamp: September 12, 2021, 03:16:27 pm
content: Quote from: gcewing on September 12, 2021, 11:45:18 amFrom the appearance of the boards I think their 'fibre' is made that way, but in therapidself assembly version of the same:
change footprint for higher rework cycle life? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: September 07, 2021, 10:25:25 pm
content: I wanted to test some boards but they need some chips that will be tested, perhaps 4-5 reworks. I don't want to get a DIP adapter here, because its not high cycle enough. its a part that needs to be changed out after alot of testing to verify some amplifier impedance parametersIs there anything that can be done to a footprint to make it tougher then a normal footprint but not favorable as a standard footprint for some minor drawback? I thought about having tapered shapes on the PCB (like jaws) so there is more copper area bonded to the substrate to better support desoldering. I am not sure you can do anything to a SOIC or TSSOP package to make the footprint mechanically stronger?

author: SeriousSam
author_rank: Newbie
timestamp: September 08, 2021, 09:10:05 am
content: Reading your message I had a wild idea: Can you add a via to each pad towards the center of the footprint? This is assuming there is space and it does not cause signalling issues. It could help prevent the solder pad from coming loose. Maybe worth a try.

author: Gribo
author_rank: Frequent Contributor
timestamp: September 08, 2021, 11:44:36 am
content: Use maximum pad size instead of nominal.What sort of package? What pitch? Do you have enough space for double layout (Both DIP and SO)?

author: wraper
author_rank: Unknown
timestamp: September 08, 2021, 11:48:08 am
content: You could extend the pads on both ends and cover those with solder resist so they cannot be pulled as easily.

author: NorthGuy
author_rank: Super Contributor
timestamp: September 08, 2021, 06:20:09 pm
content: I'd say normal footprints are strong enough to survive 4-5 re-solderings.If it's only for testing and you can get test parts in DIP, I would go with a ZIF socket. It's less work than re-soldering.Even if the parts were not available in DIP, I would still use a ZIF socket and small SSOP-to-DIP PCBs where I would solder the test chips so that I can switch freely back and forth.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 08, 2021, 06:51:56 pm
content: If possible / permitted I would consider using leaded solder or even lower melting point (e.g. In/Sn) solder for the parts in question.Less temperature causes less stress to the PCB on soldering / unsoldering.For desoldering and hand-soldering it can help if the pads don't extend very much under the chip and a bit more to the outside.At least avoid the opposite. A thin stub to the inside would be OK.A good iron / tip for unsoldering can make quite some difference.
New biodegradable PCB Material - Page 1
Forum section: electronics / general

author: Ranayna
author_rank: Super Contributor
timestamp: September 02, 2021, 01:20:19 pm
content: I do not know enough to be sure if this belongs in the Dodgy Area, i will give them the benefit of doubtToday, i read a short article on Heise.de, about a new supposedly biodegradable PCB material, that has now entered testing phase:https://www.heise.de/news/Jute-statt-FR4-Recyclingfaehiges-Platinenmaterial-6179518.html(German)The manufacturers page:https://www.jivamaterials.com/Supposedly, the material delaminates in hot water, making it easy to separate the copper traces.Feasible? Dodgy? I assume that stuff would have a long way to go to really replace FR4, but there are still a lot of devices made with cheaper materials...

author: ataradov
author_rank: Super Contributor
timestamp: September 02, 2021, 06:34:47 pm
content: The issue with any biodegradable materials is that they degrade quite rapidly even without the degrading factors. Hot water may accelerate the process, but they will degrade on their own.A long time ago I had a bunch of biodegradable plastic bags from the local grocery store, and I had no particular use for them, so I just stored them in a folded state. I forgot about them for a few years, and when I later found them, they turned into mulch. The whole stack of bags just degraded into a pile of ~5-20 mm flakes that would fall apart when handled.And this was stored in a room at normal room temperature.For the bags it is fine, but I expect the same exact thing happen to anything that intentionally designed to degrade.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: September 08, 2021, 05:37:45 pm
content: Technical data is available only by using their contact form. Therefore, no useful technical data is available. For instance, what are the equivalent parameters compared to FR-4:https://en.wikipedia.org/wiki/FR-4Does it carbonize when there are arc tracks? That would be an interesting failure mode.
Is old stock really a problem? - Page 1
Forum section: electronics / general

author: pylo
author_rank: Regular Contributor
timestamp: September 13, 2021, 01:10:30 pm
content: We were looking for a specific stepper motor driver IC for an older project that needs a new manufacturing round. Unsurprisingly in the industry's current situation, hard to get. We've found one distributor though who claims to have it in stock, but we've been warned the stock is over 7 years old. Should we be worried about this? I know about possible moisture problems, but I guess they can be managed with proper baking on the assembler's side. Anything else I should be concerned about?

author: langwadt
author_rank: Super Contributor
timestamp: September 13, 2021, 01:14:55 pm
content: oxidation of the pins can make some stuff damn near impossible to solder

author: Mangozac
author_rank: Frequent Contributor
timestamp: September 13, 2021, 10:44:27 pm
content: Quote from: langwadt on September 13, 2021, 01:14:55 pmYeah this is what I'd be more concerned about.

author: james_s
author_rank: Super Contributor
timestamp: September 13, 2021, 10:53:09 pm
content: If they're probably stored I've never had a problem with old stock, I've used parts that at around for 30+ years before.Can you buy a few samples to evaluate before you commit to a larger order?

author: alexaraujo
author_rank: Regular Contributor
timestamp: September 13, 2021, 11:30:16 pm
content: I would also be afraid of oxidation, as I've had a bad case. I had a coil that was lost in the stock of LL4148 and when I went to look at the date it was five more years after the purchase, right where we lost approximately 20% of it due to oxidation.In this case, it was easy because the material was in our possession, we sampled it before sending it to an external plate assembler company;
Dry Cabinet? - Page 1
Forum section: electronics / general

author: jrs45
author_rank: Regular Contributor
timestamp: August 31, 2021, 03:18:35 pm
content: Like many of us, I purchased some semiconductors we'll need for the next couple of years for production. We usually don't deal with storage - what is generally recommended? I see plenty of "dry cabinets" available for such things, and some cheaper ones meant for lenses.What do most people do? What humidity should I ensure we reach?

author: bdunham7
author_rank: Super Contributor
timestamp: August 31, 2021, 03:25:00 pm
content: How are they packed now?

author: jrs45
author_rank: Regular Contributor
timestamp: August 31, 2021, 03:43:02 pm
content: It's a variety. Some parts are packed in sealed moisture-proof bags, but some I've had to open to ship some of the parts, so they're just in ESD now or unsealed moisture controlled bags.

author: hcglitte
author_rank: Regular Contributor
timestamp: September 02, 2021, 11:41:58 am
content: Hi,I use totech dry cabinets.They are expensive, but I got a demo uint 10 years ago for about 1500 USD and a second one last week (used) for about 600 USD.These are great and will reach RH of about 1 to 3 %.Check if you can buy a used one.You can also put 3d printer filament in them.

author: ejeffrey
author_rank: Super Contributor
timestamp: September 05, 2021, 09:14:19 pm
content: Dry boxes are great for "active" storage where you need regular access or for complex or fragile assemblies that are moisture sensitive. For storing packaged chips I would just recommend a vacuum sealer. Reseal the components you need to store with a dessicant pack and an indicator card. Then you can store them on any shelf.

author: jrs45
author_rank: Regular Contributor
timestamp: September 07, 2021, 09:01:43 pm
content: Thanks! That makes sense.
TSMC hikes chip prices up to 20% amid supply shortage - Page 1
Forum section: electronics / general

author: DC1MC
author_rank: Super Contributor
timestamp: August 26, 2021, 07:28:40 pm
content: https://asia.nikkei.com/Business/Tech/Semiconductors/TSMC-hikes-chip-prices-up-to-20-amid-supply-shortage?

author: ataradov
author_rank: Super Contributor
timestamp: August 26, 2021, 09:16:59 pm
content: It is fine given that they are building new fabs. It capitalizes on the current demand, but essentially ensures that prices go down once there is new capacity and demand drops.
STM32 Bare Die - Page 1
Forum section: electronics / general

author: robotix3
author_rank: Regular Contributor
timestamp: August 20, 2021, 09:26:46 pm
content: Has anyone been able to procure bare die STM32's? Due to the shortage it's looking like some parts are easier to find in bare die form than the packaged versions, but I can't seem to find a distributor that carries STM products.Also, in general it would be interesting to hear if anyone is going towards more bare die to alleviate supply chain issues?
Connector wire solder jig design - Page 1
Forum section: electronics / general

author: hcglitte
author_rank: Regular Contributor
timestamp: August 20, 2021, 04:00:59 pm
content: Hi,I designed a connector wire solder jig. It works fine. However, any input on how to make it better is appreciated. See pictures.Regards HC

author: nvmR
author_rank: Regular Contributor
timestamp: August 20, 2021, 04:36:31 pm
content: Cool jig, liked the fact that the tabs keep the shrink from going close to the soldering point and preshrinking.You could add a rectangular tab to the part that holds the connector to make sure it doesn't spin if your tolerances are a bit off.Another point, though hard to judge just from the pictures, is that the bottom right screw hole is obstructed by the clamping mechanism. moving it off the edge can relieve that, depending on whether the hole is needed exactly there or not.Also a fillet can be helpful one the external two sides of the wire holders, as they seem quite fragile, and may brake.A final point, the moving section itself may be unnecessary, as just two "canals" in a solid piece of material may be enough to guide your wires home.

author: mariush
author_rank: Super Contributor
timestamp: August 20, 2021, 05:55:11 pm
content: How are you soldering the wires?If you're simply introducing solder to the junction, then you're not really doing it correctly.Ideally, you insert some solder wire into the holes in the connector, make it liquid, then use some solder wick to absorb the solder, leaving the inner hole tinned.Then, tin your wire, insert your wire, and add fresh solder.The Pace soldering tutorial doesn't mention wire being tinned but they also insert the wire into the liquid solder in the cup, which may no longer be the best "strategy".
Raise/Elevate Push Button Switch - Page 1
Forum section: electronics / general

author: Saimoun
author_rank: Frequent Contributor
timestamp: September 01, 2021, 10:53:53 am
content: HiI struggle to find push-buttons with a cap that are the right height for my project. Usually I need to raise them by like 1mm or so for them to be at the right height for the box.So I was wondering how to do it in a manufacturing-friendly way, for a relatively small (say 1000) quantities?ThanksSimonPS: I read a bit online and found different solutions, like glueing a piece of plastic or metal underneath.PPS: And speaking with some switch manufacturers, 1000 is too small of a quantity to make custom molded caps (that would fit the height). One of them said from 30000 they could do it for a small extra cost.

author: rea5245
author_rank: Frequent Contributor
timestamp: September 01, 2021, 11:53:33 am
content: Quote from: simonlasnier on September 01, 2021, 10:53:53 amFacebook keeps serving me up ads for a low volume injection molding company. Sorry, I forget their name. But try googling "low volume injection molding".Of course, you'd have to design the keycap yourself.

author: Saimoun
author_rank: Frequent Contributor
timestamp: September 01, 2021, 12:11:33 pm
content: Ha ha ha I think I get the same ad actuallyThey seem to make 3d-printed molds it looks like?I'll check it out - thanks.

author: SMTech
author_rank: Frequent Contributor
timestamp: September 01, 2021, 02:02:51 pm
content: We build a lot of things that have pushbuttons in an enclosure with a label overlay. With the larger size of pushbutton (10mm body?), this is fairly simple, its quite easy to find just the right size of spacer for the PCB then all you need to do is perhaps add a paper sticker or two between the odd button cap and the overlay to account for variation in thickness that you get in enclosures. We have found it slightly trickier with the smaller push bottons tho' to get a mix of keycap height and tactile response we like and actually works and that has put a transition from bigger to smaller on hold while we look. For some applications its probably easier to get a keypad instead, but that depends on the environment and volume, we have a client who took that route and had huuge reliability issues

author: Saimoun
author_rank: Frequent Contributor
timestamp: September 02, 2021, 06:53:15 am
content: Ok I actually never even investigated the overlay solution, always thought it would be more complicated and expensive than simple plastic caps (which I can get super cheap at the end - it's just the matter of finding the right height).My case in in metal though, not sure how easy it is to put an overlay on it?Also I think in the field I am in, the users generally prefer the "arcade style" button like they call it than rubbery feel.