hybridfree/eevblog-posts huggingface dataset:
Preheating (or assistheating) when it gets tricky... - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: February 02, 2025, 06:23:48 pm
content: I thought i share a way to cope with a thick GND plane.I am working on my prototype, and soldering the chip that has a thermal pad, is a pain in the A**.I was looking for a heating element, that would produce heat on a small area, but i could not find any suitable ones, so i made my own. Fortunately there is a bit of a GND plane (2 layer), that leads to the thermal pad via´s. Without the heating element, it was a way, where heat got lost, but now its actually become a path where i put heat into.Tomorrow i will see how well it works. First tests are promising. The thermal pad gets to 90°C in about 55 seconds, with just this heating element (20Watts).Has anyone else made such efforts before?

author: KE5FX
author_rank: Super Contributor
timestamp: February 02, 2025, 11:45:54 pm
content: Not a bad idea! I like it, and will steal it.

author: eTobey
author_rank: Super Contributor
timestamp: February 03, 2025, 10:49:30 am
content: A 0.4mm wire works best i found so far. You could also be creative, and bend other shapes. Like a spring, that could push onto the PCB.And dont attempt to use thermal paste: I found no significant improvement. Its pretty thermally stable though.

author: b177
author_rank: Contributor
timestamp: February 04, 2025, 07:50:57 pm
content: Clever idea with the wire.I frequently use a small 95W rework heater purchased off amazon. $35 with no power supply or $50 with 100W USB-C AC adaptor.https://www.amazon.com/gp/product/B0CKQCT99Qit is ~2.5 x 2.5"I use it at 120-140C, but it gets much hotter (200+).Takes up basically no bench space & heats up fast.

author: eTobey
author_rank: Super Contributor
timestamp: February 05, 2025, 01:16:29 pm
content: I had a look at this device, but it was to huge for my purpose.A custom made copper or aluminium heating base, that would fit on my PCB would be ideal for using it with this.

author: wraper
author_rank: Unknown
timestamp: February 05, 2025, 01:36:44 pm
content: QuoteFor what? The whole idea of localizing the heat during soldering generally is pretty bad. Actually preheating a whole board is preferable in most cases as it prevents PCB warping due to uneven expansion.

author: Shock
author_rank: Super Contributor
timestamp: February 05, 2025, 06:10:23 pm
content: You could use something like a modified coffee cup warmer. My eprom eraser is a $5 mobile phone UV sanitizer.

author: eTobey
author_rank: Super Contributor
timestamp: February 05, 2025, 09:53:47 pm
content: Quote from: wraper on February 05, 2025, 01:36:44 pmBut sometimes, things get tricky: I got this huge cap on it (among others), that i dont really want to heat up. Just like 1cm away from that QFN.Of course preheating to at least a certain level is a good thing to do.
Yamaha CL feeder parts - Page 1
Forum section: electronics / general

author: law
author_rank: Regular Contributor
timestamp: January 24, 2025, 05:20:08 am
content: Hiya, I have a couple of 12mm CL feeders that look like the front pin is bent. They wont go into the machine.Does anyone have a good source for feeder parts?Thanks

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: January 24, 2025, 06:02:41 am
content: Not sure if you have access to Taobao, but parts are plenty over there at very affordable prices. Can't post any links from there as they will redirect based on your region.

author: law
author_rank: Regular Contributor
timestamp: January 27, 2025, 09:30:23 pm
content: Hey thanks. I'm not on Taobao. If I don't have any luck elsewhere I'll head there and see how I get on.

author: mon2
author_rank: Frequent Contributor
timestamp: February 02, 2025, 02:55:21 am
content: Hi. We have Yamaha equipment in our facility and plan to update to their latest machinery in the near future. We too use CL feeders (original and clones and have serviced both with spare parts out of Asia).(You may wish to also peruse the SMT forum on SMTNET.com - lots of Yamaha owners onboard)Sharing some contacts who can assist you:PY2nd Floor, Building 4, Fu'an Third Industrial zone, Fengtang Avenue, Fuyong Street , Baoan district, Shenzhen Guangdong China 518103http://www.py-smt.comhttp://www.surfacemountparts.comTEL:+86-755-36628835FAX:86-755-23501556Mob:+86-13428704061Whats App:+86-13428704061Skype:Beckypingyou@hotmail.comElissaWebsite:www.smtwenzhan.comSkype: smtwenzhan@163.comTel/Wechat/Whatsapp: +86 13923713803QQ: 2966592980Add: 3F. Building D, Lihao Yongda Park, No.20 Dongfang Blvd, Matian, Guangming District, Shenzhen, Guangdong, China 518106

author: law
author_rank: Regular Contributor
timestamp: February 04, 2025, 12:39:25 am
content: Thanks very much for that - I'll give them a try.
Some questions about a BGA solder balls defect  - Page 1
Forum section: electronics / general

author: Sundy
author_rank: Newbie
timestamp: January 13, 2025, 03:43:43 am
content: Some small solder balls would appear around the solder joint during the reflow soldering process (only occur in the air atmosphere).The whole TEST reflow process is:a. Place solder paste onto stencil/screen and print the terminal pattern onto the test substrate by wiping paste over the stencil/screen in one smooth motion using rubber or metal squeegee.b. Remove the stencil/screen carefully to avoid smearing the paste print.c. Verify a paste print equivalent in geometry to the terminal of the device to be tested.d. Place the terminals of the component being tested onto the solder paste printed pattern.e. Verify the component placement by appropriate magnification.f. Place the test substrate into the applicable reflow equipment and conduct the reflow process.g. After reflow, carefully remove the substrate with the component(s) and allow to cool to room temperature.h. Remove the component(s) from the substrate. The component leads may adhere slightly to the substrate due to the fluxresidue.i. Before examination, all leads shall have all visible flux residues removed. Care should be exercised in the flux residue removal process to not damage the leads or terminations.Now I doubt that this problem may be caused by the wettability of the solder paste( for we change the solder paste component).Can anyone tell me what is the reasons of this "satellite balls" phenomenon?

author: thm_w
author_rank: Super Contributor
timestamp: January 13, 2025, 10:06:08 pm
content: What is the "reflow equipment"?If its hot air based then it can blow stuff around. Or if its not properly leveled, or the rack is uneven, etc.

author: Sundy
author_rank: Newbie
timestamp: January 14, 2025, 01:45:40 am
content: I don't know whether it is.Reflow oven ： ERSA HOTFLOW 320.

author: NorthGuy
author_rank: Super Contributor
timestamp: February 01, 2025, 02:52:51 pm
content: I don't think soldering without copper models the real soldering process adequately. Copper attracts solder and keeps it in place.
PCBWay Shipping Options to the U.S.? - Page 1
Forum section: electronics / general

author: TimeBandit
author_rank: Regular Contributor
timestamp: January 13, 2025, 04:00:15 pm
content: I've never used PCBWay before, and I was wondering what folks in the U.S. typically choose for the shipping option. The default seems to be DHL.

author: ataradov
author_rank: Super Contributor
timestamp: January 13, 2025, 04:26:58 pm
content: Either DHL if you need it fast or the global shipping if you need it cheap, but fine waiting a couple weeks.

author: TimeBandit
author_rank: Regular Contributor
timestamp: January 13, 2025, 10:55:56 pm
content: Thanks. The description of Global Shipping (Standard and Direct) on the PCBWay site makes it sound like it's a coin flip as to whether it'll actually show up.

author: ataradov
author_rank: Super Contributor
timestamp: January 13, 2025, 11:15:10 pm
content: I used it 5 times or so, never had any issues with it. It arrives though USPS on the other end. The time it takes will probably vary. The worst time I had was close to 3 weeks. Typically it takes 1.5-2 weeks.

author: bostonman
author_rank: Super Contributor
timestamp: January 14, 2025, 02:45:41 pm
content: Do you have a preference on board houses?The recommended company on here and the one I used is JLCPCB. I only used them once, but was very happy with shipping time and service.For some reason it doesn't seem I kept the receipt to reference costs; else I'd let you know what I paid.

author: TimeBandit
author_rank: Regular Contributor
timestamp: January 14, 2025, 06:13:59 pm
content: I'm using PCBWay for some 3D printed parts. Someone posted the STL file on their site, so I figured I would just order from them.

author: TimeBandit
author_rank: Regular Contributor
timestamp: January 31, 2025, 01:55:29 pm
content: Just updating this to say that I went with Global Shipping Direct, and the package from PCBway arrived at my door in nine days. Perfectly happy with that.
LongWei lw-800 solder station - Page 1
Forum section: electronics / general

author: mentholflash
author_rank: Contributor
timestamp: January 29, 2025, 04:04:11 am
content: Hi all.I have just purchased a longwei lw-800 solder station.While putting the holder for the hot air gun onto the outer casing in pre tapped holes it got harder to screw right the way in.I took of the case and saw the screws were about 4 times too long and hitting the outer steel of a transformer.Big question. Will it hurt anything, kill me.Thanks in advance

author: Kean
author_rank: Unknown
timestamp: January 29, 2025, 09:35:42 am
content: Probably not if it hasn't already.I am assuming a laminated core "E-type" transformer.As long as the screws are hitting the outer steel and not the transformer windings, then they can't do much damage.

author: mentholflash
author_rank: Contributor
timestamp: February 01, 2025, 04:02:41 am
content: Thanks for the replywasn't sure bought new short screws and put tape where they would touch on the transformer.Just in caseCheers
PNP for home use, any suggstions - Page 1
Forum section: electronics / general

author: prutser
author_rank: Regular Contributor
timestamp: January 13, 2025, 06:29:45 pm
content: I am considering a PNP machine for home use, after spending 4 hours to do PNP by hand on a small PCB with quite some 0402 and some 0.5mm pitch QFN.For this reason I am considering some form of PNP machine. I am looking for some suggestions for an affordable ($750 - $1500) solution (if even possible)Some requirements:Open PNP compatibleA few feeders (2..4) would be nice, I do not mind placing some passives by hand, if e.g. placing decoupling capacitors and the common resistor values can be done using a feeder it is already a a time saver.As far as I understand: bottom vision is important for find pitch componentsAre there models which can "grep" components from a kind of tray (I have most SMD components in small SMD containers)Speed is not a concern, I expect is always saves a significant amount of time0402 (imperial) components should be possibleI have seen several projects and chinese machines on teh web, but it's hard to get a clear picture, so any insights are appreciated

author: jmelson
author_rank: Super Contributor
timestamp: January 21, 2025, 01:18:15 am
content: I have an OLD commercial P&P (Quad QSA30A) made in about 2000. It has 3 nozzles and an automatic nozzle changer. A bottom camera was optional, it doesn't have it. It does have flying vision, however. There are line-scan cameras on each nozzle that sights across the part, and it gauges the dimensions and rotation/centering of the part. It does an amazing job on 0.5mm lead pitch parts, placing them within about 0.1mm of perfect, and usually even better than that. It also has a top camera for fiducial detection. It also has servo motors for the Z axis on each nozzle, and places the parts very gently. I do 0603 as my smallest parts, I don't even want to think about 0402!Jon
_ - Page 1
Forum section: electronics / general

author: PlushTush
author_rank: Newbie
timestamp: January 10, 2025, 05:10:03 pm
content: _

author: Analog Kid
author_rank: Super Contributor
timestamp: January 10, 2025, 10:42:23 pm
content: OK, so ... ?

author: IconicPCB
author_rank: Super Contributor
timestamp: January 12, 2025, 10:36:02 am
content: New old stock National Semiconductors has been out of business for a loooong time. Long enough to result in surface degradation
PCB footprint for several push button models? - Page 1
Forum section: electronics / general

author: mclien
author_rank: Contributor
timestamp: January 08, 2025, 08:05:55 pm
content: While I was designing a small PCB I was looking for a small smd push button, like those that are usually mounted on most MCU dev boards (arduino kind) as reset buttons.Well, I thought "there is for sure some standard for this". Couldn't be more wrong, as it seems.So my idea is: Is there any "multipurpose footprint" which can be used for a bunch of those pushbuttons (in the range of 3 by 2 mm, +1mm in both directions), so that there is no need to edit the PCB any time there has to be placed another type of button?Best I found so far is this:https://configured-product-images.s3.amazonaws.com/Datasheets/TL1017.pdfAt least one could use all buttons f that series by using the 3 pad footprint with tho hole in the middle. As long as one pin is ground anyways, that could be done.Even better would be a footprint which is usable for different manufacturers.Any hints or solutions for that approach?

author: thm_w
author_rank: Super Contributor
timestamp: January 08, 2025, 09:53:16 pm
content: 4 pin or 2 pin? 3 pin is not terribly common in that style imo.Just make a footprint for the most common ones on lcsc/aliexpress and then overlay them in your PCB design. Then make another footprint based on that layout, if necessary.For the larger 4 pin size the footprints should all be fairly similarhttps://www.lcsc.com/product-detail/Tactile-Switches_RI-SHENG-ST-1109S-3-8_C589271.html?s_z=n_tactilehttps://www.lcsc.com/product-detail/Tactile-Switches_XKB-Connection-TS-1102S-C-C-B_C381039.html

author: shabaz
author_rank: Frequent Contributor
timestamp: January 08, 2025, 10:32:00 pm
content: I do that all the time for hobby projects that will be hand-soldered. I thought everyone did a similar thing.You could just use the footprint in that datasheet, and extend the pads all-round a bit to accommodate variations. For instance, the footprint in my screenshot has longer pads than the ones in your datasheet, for that exact reason. You could optionally place a drill hole at the center if you wish, since some 4x3 switches have a plastic peg (I just snip that off with flush cutters for hobby projects).

author: mclien
author_rank: Contributor
timestamp: January 08, 2025, 10:50:12 pm
content: I was thinking of the selfmade footprint, but was kind of surprised that there is no such thing as a common footprint and kind of standard push button similar to the the pin head raster.So maybe find a pcb producer first and see what their cheapest push button is.As for 1 or 4 pins I was looking for the 2 pin types since the space I have is more rectangular than square.
PCB way as turn key supplier - Page 1
Forum section: electronics / general

author: implor
author_rank: Regular Contributor
timestamp: December 25, 2024, 08:03:27 am
content: Anyone used PCB way as a turnkey supplier?I want someone who can do everything from the parts, assembly and packaging. I want my product delivered ready in retail packages.From Asia I have only found PCBway who offers this. Is there any more?

author: jmelson
author_rank: Super Contributor
timestamp: December 25, 2024, 08:42:38 pm
content: I have used them for full PCB, assembly and parts procurement. They did a FINE job, and were very careful to communicate and get everything right. However, if you are in the US, beware of the tariff situation. We got bit HARD by 50 % tariffs on larger orders! They are our all time PCB fabricator, but we mostly do assembly in our own shop.Jon

author: Psi
author_rank: Super Contributor
timestamp: December 25, 2024, 10:11:36 pm
content: I've also used PCBway for full PCBA with some customer supplied parts and some PCBway supplied parts and they always communicate well.I don't think they're the cheapest option, but sometimes you want reliable/reduced-risk more than you want cheap.Make sure you check what price they are charging for parts on the BOM vs what the parts actually cost and look for any crazy abnormalities like 40% higher. Note that pcbway have to pay china import tax on parts they order from outside china, so don't expect to get the same price as digikey if pcbway have to import the parts for you.Other parts they don't have to import are often a bit cheaper than Digikey, so you do gain in other areas.If the BOM cost higher than say 25% of digikey price ask them for a better price. Some parts they will be able to give you a better price if you ask nicely for it. (PCBWay bom price is negotiable). But some parts the price may still be quite high and it will be cheaper for you to order that part yourself and ship to china, paying the china import tax yourself, it's around 13% + DHL fees.If shipping parts into china I recommend shipping fully duty paid by you, otherwise PCBway will have to charge you again for the duty they need to pay to accept the goods and will probably add a bit extra for their time/hassle. So it's easier to just pre-pay china import tax as part of your DHL shipment. Who pays the tax is one of the options when you make a DHL booking, it defaults them them paying so you have to change it to you. The cost then gets adding to your DHL account a few days after your ship the item.

author: sneha218
author_rank: Newbie
timestamp: January 06, 2025, 04:23:11 am
content: If you are looking for PCB assembly service then you can checkhttps://www.thuse.net/or mail at quality@thuse.net .
Is Digikey website down or local issue only to me? - Page 1
Forum section: electronics / general

author: mon2
author_rank: Frequent Contributor
timestamp: December 30, 2024, 09:21:36 pm
content: Hi. Their phone lines are not working. Website is returning Error 500 when you attempt to view the cart.Appears to be down for all...https://downdetector.com/status/digikey/

author: Jackster
author_rank: Frequent Contributor
timestamp: December 30, 2024, 09:23:07 pm
content: Yep, down for me in England

author: mon2
author_rank: Frequent Contributor
timestamp: December 30, 2024, 09:24:04 pm
content: Thanks. Thought it was our internet cookie thing or lack of. The phone lines are also not ringing. Hope all is ok.

author: Bud
author_rank: Super Contributor
timestamp: December 30, 2024, 10:36:02 pm
content: Works fine here in Ontario.

author: mon2
author_rank: Frequent Contributor
timestamp: December 30, 2024, 10:45:32 pm
content: Thanks. We are also in Ontario. The website appears to be working now. The cart system is no longer crashing with Error 500. Will attempt to book an order. Thanks again for the heads up!Update - yup. Received an email from DK that they indeed did have an issue this afternoon and were working to resolve asap. Just booked an order and received the confirmation. Yeah
parts not coming out of component tape - Page 1
Forum section: electronics / general

author: jmelson
author_rank: Super Contributor
timestamp: December 27, 2024, 05:00:22 pm
content: Hello,I just did a couple boards on my P&P machine, and had HUGE problems with the parts not coming out of the tape. These are 0.1 uF and 1.0 uF 0603 parts. When I went to manually finish the assembly, I was having a lot of trouble picking parts out of the tape with a mouth-opearted vacuum hose. It seems maybe the pocket in the tape is too small for the part to come out easily. Has anyone else seen this kind of issue? I will have to check and make sure there are no air leaks in the vacuum system.Thanks,Jon

author: Jackster
author_rank: Frequent Contributor
timestamp: December 27, 2024, 05:42:19 pm
content: The pocket in the tape should be about 30-50% larger than the component (roughly if you look at them, actual spec varies). If the pockets are too small, the manufacturer has fucked up.What is the MPN and where did you get them from?

author: jmelson
author_rank: Super Contributor
timestamp: December 28, 2024, 02:15:55 am
content: Quote from: Jackster on December 27, 2024, 05:42:19 pmThe 0.1 uF is a TDK part I have had for some years, the 1.0 uF is one I just got a few weeks ago from Digi-Key, made by Taiyo Yuden.These pockets are not really 30-50% larger than the part, but they are not so snug that they ought to be preventing the part from lifting.Anyway, the 0.1 uF part that I have had for a while fed just FINE on my old machine. But, it had different nozzles than my new machine. I have a choice of really small nozzles or ones just a bit bigger. I will try the next size up nozzle next time. Also, next time I have the machine fired up I will check the nozzle vacuum, just in case there's an air leak.Thanks,Jon
Flux is repelled from tip? - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: February 01, 2025, 11:28:33 am
content: Hi,i had a little solder exercise session, and while trying to push flux to the pins, i noticed, that the flux is seemingly repelled by the tip. (The flux, that has already been touched and activated with the tip). While quickly moving the tip around, there is no repelling noticable, but when not moving it, the flux is repelled. It is not just beeing vapourized, it really creates a wave around it, as it is pushed away. This was easy to oberserve with flux and the tip on top of the chip, but also on the PCB itself (just barely visible).Anyone has oberved this to, or has an explanation for it?Already spend quite some time looking for some extensive tutorial about the whole topic, but only could find 40 Year old good ones, and a few newer "OK" -ones.Another question that i could not get an answer to:What is the reason to add flux when desoldering chips with hot air? It works without it anyway.

author: eTobey
author_rank: Super Contributor
timestamp: February 01, 2025, 08:15:16 pm
content: I have now made the observation, that the flux is repelled by just the heat. Or lets say a heat difference. It start to retreat at around 120°C.You can see this in the video, just besides the iron as it is dragged along side the chip (almost white color), or in the picture on the upper right.https://youtu.be/36LSd0uv8RE
Non-traditional materials for enclosures - silicone rubber lunch box? - Page 1
Forum section: electronics / general

author: e100
author_rank: Frequent Contributor
timestamp: December 25, 2024, 07:35:51 am
content: Has anyone used anything like this for a project box?I'm guessing that fumed silica (Cab-O-Sil) has been added to increase the stiffness, or perhaps they somehow managed to embed stiffener sheets effectively making it a composite layered material.I'm interested because very few plastics are UV stable, easily glueable, tough, heat resistant and cheap.Silicone rubber should in theory be compatible with silicone rubber based adhesives. I know from experience that regular silicone sealant intended for windows has excellent adhestion to FR4, so conceivably waterproof through hole connectors could be mounted on a stiffner plate and made into a FR4-silicone rubber-FR4 sandwhich.Typical picturehttps://kmartau.mo.cloudinary.net/805d8638-c8a9-4c1e-86fc-a46802c76a43.jpg
Where to buy Rogers RO4350B copper clad - Page 1
Forum section: electronics / general

author: matthuszagh
author_rank: Frequent Contributor
timestamp: August 28, 2022, 04:22:26 am
content: I'd like to buy small quantities of some rogers 4350B copper clad for some RF prototypes. A quick search didn't yield many suppliers. Where do people go to buy this? The only source I could find was rf-microwave.com, which looks promising and the prices seem reasonable. Anyone have experience with them?

author: IconicPCB
author_rank: Super Contributor
timestamp: August 29, 2022, 08:24:49 pm
content: how small?

author: matthuszagh
author_rank: Frequent Contributor
timestamp: August 29, 2022, 11:12:46 pm
content: I'd prefer to spend a couple hundred dollars or less for an order. And I'm happy to cut larger sizes down to the size I need. The deal on rf-microwave.com of $72 for one 12x18" panel (https://www.rf-microwave.com/en/rogers-corp/ro4350b-0100-1e-1e/double-side-laminate-with-polyester-ceramic-dielectric/ro4350b-0100-10s1/?filter=q1YyNLdUsopWCvI3MTY1cFKK1QGKGINEDEFsU2MjMNtIoULB0EIhM08pthYA) seems great. I'd probably order several of these to cut down on the shipping cost per panel (I'm in the US) and that should last me at least a couple months.

author: IconicPCB
author_rank: Super Contributor
timestamp: August 30, 2022, 12:14:11 pm
content: That sounds like a great ... I mean good deal,I have had to deal with Rogers in Singapore and have material come out of China.A bloody expensive exercise.

author: SMTech
author_rank: Frequent Contributor
timestamp: August 30, 2022, 01:01:53 pm
content: Quote from: matthuszagh on August 28, 2022, 04:22:26 amOne of clients uses a vast array of ATC high voltage ceramic caps, they all come from rf-microwave.com and ship quickly, so anecdotally they seem to a be reliable competitive specialist supplier.

author: abby1319
author_rank: Newbie
timestamp: December 19, 2024, 02:53:40 am
content: Hi Guys, are you still need any Rogers Substrates? Contact me, we carry a full range of Rogers Substrates from 3000s to 6000s.Ready stock and very good price.Check me out at abby@zbwbpcb.com +86-13928411387
Suggestions for EU-based PCBA (500-4000 PCB batch orders) - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: November 06, 2024, 12:10:43 pm
content: Hi all,We are a Danish developer of electronics products and have been working with a US based PCBA for the past 8 years. However, we have been looking to potentially shift to an EU-based PCBA instead for some time. With today's victory to Trump, we expect we may need to speed this up due to the substantial risk of new duties that may negatively impact our margins in a major way.We have around 10 different PCB designs and order each PCB type in batches of 500 to 4000 pcs. We source some of the critical components ourselves, but we prefer to have the PCBA source most of the components. Ideally, the PCBA is based in EU, offers high quality and mid-tier prices, combined with good support.If the PCBA has a flexible online system where we can upload our designs in a simple manner (rather than handling everything ad hoc by email, for example), that is also a big plus.Any suggestions are welcome.Martin

author: tszaboo
author_rank: Super Contributor
timestamp: November 06, 2024, 12:17:42 pm
content: I'm not going to give you a specific advice. You should look for a PCBA supplier locally. Look for someone that's not to big and not too small, meaning you give them maybe 5% of their annual capacity. Any bigger percentage than that, and they might go out of business if you don't order from them for any reason. Like slow business. Any smaller percentage than that, and you will not be treated like a real customer. There are always discussions like increasing yield or specific assembly instructions, that require a lot of time invested on their side. If they are a big company, they are not going to do that, and you will be just one of the 1000 customers that they are happy to drop if there is too much trouble.

author: multipla
author_rank: Contributor
timestamp: November 22, 2024, 11:45:09 am
content: Vietnamese taxes don't pay my pension though

author: avst
author_rank: Contributor
timestamp: December 17, 2024, 09:22:05 am
content: We had good experience with ATP Elektronik near Hamburg. We have used them for 100-200 Batches.
Hakko bcm/cm tips for fx-888d - Page 1
Forum section: electronics / general

author: braincat
author_rank: Contributor
timestamp: December 15, 2024, 10:27:03 pm
content: Hi All, any idea where to get this tip type? It has a hole in the middle for drag soldering. I could not find it available for fx-888d.Are there replacements that could work with this soldering station?Thanks!

author: aeg
author_rank: Regular Contributor
timestamp: December 16, 2024, 01:32:03 am
content: Jensen claims to have 1pcs 900M-T-3CM in stock. You could also consider Plato HS-0530 or HS-0531.I tried 900M-T-3CM once or twice and didn't really like it. I have the best results with an ordinary conical (!) tip and plenty of liquid flux. Your mileage may vary.

author: braincat
author_rank: Contributor
timestamp: December 16, 2024, 03:41:29 am
content: Thanks for the recommendation.Do you drag the conical tip across the pins, or solder pins one by one?

author: thm_w
author_rank: Super Contributor
timestamp: December 16, 2024, 10:20:47 pm
content: Drag across.Single pin is not needed unless you are fixing the chip in place, or cleaning up a single bad joint or something.

author: aeg
author_rank: Regular Contributor
timestamp: December 17, 2024, 01:01:43 am
content: I drag across, then inspect and individually redo any pins that have bridges or look questionable.
What soldering technique was used for this board... Reflow or wave soldering? - Page 1
Forum section: electronics / general

author: onemanonelaptop
author_rank: Contributor
timestamp: December 04, 2024, 10:18:44 am
content: I have a board from the Early 90's, a motherboard for a Sega Game Gear. I am trying to figure out what method they used to solder these together, looking at the picture below i am leaning towards wave soldering.There seems to be a stackup of solder consistently on the left side of each component, that coupled with some legs of some components having solder higher upthem than i would normally expect from reflow solder.Also... the large ASICs have enlarged pads on the corners, which "might" be for solder capture.However there appears to be NO glue holding any components down (bar some of the electrolyitcs) as far as i can tell..... I dont know much about SMD wave soldering, but not sure how they would ever stay in place without glue, which ive seen red blobs of on other PCB's which i know for a fact were wave soldered.What do you think? Wave soldered or Reflow soldered?

author: SMTech
author_rank: Frequent Contributor
timestamp: December 04, 2024, 12:43:31 pm
content: Reflow.Were it wave all the vias in your second picture would be full of solder, it is also common to see IC's rotated 45degrees with kite-shaped pads at the front corners.Is the first image a different board / side? That destroyed area with the missing part looks a bit like there was glue there and the board style is different.

author: onemanonelaptop
author_rank: Contributor
timestamp: December 04, 2024, 12:58:59 pm
content: Its the same board, just the back of it,

author: Bud
author_rank: Super Contributor
timestamp: December 04, 2024, 01:03:20 pm
content: Surface tension of molten solder holds components in place. No glue needed unless it is a heavy component.

author: SMTech
author_rank: Frequent Contributor
timestamp: December 04, 2024, 02:13:50 pm
content: Quote from: Bud on December 04, 2024, 01:03:20 pmYou glue for wave, because there is no solder......

author: SMTech
author_rank: Frequent Contributor
timestamp: December 04, 2024, 02:18:10 pm
content: Quote from: onemanonelaptop on December 04, 2024, 12:58:59 pmLooking at a full PCB picture - that side could be wave soldered, the THT parts are on the other side after all, so there's a reason to wave. Would explain the masked vias, excess solder and apparent single axis shift of all the components.

author: Matt-Brown
author_rank: Regular Contributor
timestamp: December 11, 2024, 05:00:00 pm
content: Looks like asic side was reflow and first picture proablly reflow and wave solder. the component shift could be placement of smt machines being off as they dont move in wave, but will usually fall off

author: wraper
author_rank: Unknown
timestamp: December 11, 2024, 05:06:15 pm
content: Looks like wave soldering. I can see adhesive on the top picture and IC footprints suggest wave soldering as well.
Jlcpcb new QR feature - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: November 19, 2024, 09:20:36 pm
content: I'm not sure if this has been discussed before and I missed it, but jlcpcb has a new QR / data matrix / serial feature that allows you to put a different number on each board, in a scannable form!This is huge for me, I have been thinking about labels or laser marking boards to do this but them doing it is way easier. Now I can serialise all the boards in the erp, and connect up failures etc to specific production. The printer / spi can scan the board and know which serial numbers are being made. Traceability!

author: jduncan
author_rank: Regular Contributor
timestamp: November 19, 2024, 10:55:25 pm
content: Man... that makes my purchase of a fiber laser even more frivolous

author: loki42
author_rank: Frequent Contributor
timestamp: November 19, 2024, 11:31:28 pm
content: *looks sheepishly at my Trumpf fiber laser...*

author: visrealm
author_rank: Contributor
timestamp: December 16, 2024, 04:19:43 am
content: These are great. I just tried it on my latest order of 150 boards.You will get missing numbers. My boards were panelized to 5 boards per panel, and for the batch of 150 boards (30 panels), 30 serial numbers are missing. So, instead of getting 0200-0349, I got 0200-0379 with 30 boards (6 panels) missing.Not a lot you can do about that I suspect. Would be great if they could test the boards prior to screen-printing, but... whatever. I just need to keep a record of board serials I never received.

author: kylehunter
author_rank: Regular Contributor
timestamp: December 16, 2024, 10:52:47 am
content: Quote from: visrealm on December 16, 2024, 04:19:43 amThat's actually to be expected. There are boards they will test and scrap. The missing numbers are likely from that. There's not much they can do to prevent this either.

author: asmi
author_rank: Super Contributor
timestamp: December 16, 2024, 03:57:45 pm
content: Quote from: visrealm on December 16, 2024, 04:19:43 amThat gives a bit of an insight into their manufacturing yield. Of course single order is not representative as there could be a number of things which went wrong on that specific batch, but over many order it should paint a picture.

author: loki42
author_rank: Frequent Contributor
timestamp: December 16, 2024, 10:12:37 pm
content: Got my first few lots of boards with this and it's great. Easy to scan and where I specified it.
Siplace Smart Feeder spare parts.  - Page 1
Forum section: electronics / general

author: Wolfgar
author_rank: Newbie
timestamp: November 25, 2024, 09:12:55 pm
content: Hello everyone!Before I receive permission to view the parts catalog for our machines, I would like to ask you if there is a spare part for SIPLACE Smart Feeder-8. I mean the reel locking element.I have the impression that this element is micro-welded, but I have a few to repair because the locks are bent. It would be a shame to scrap them.

author: mon2
author_rank: Frequent Contributor
timestamp: November 26, 2024, 02:04:11 pm
content: Post the same request inside the smtnet.com forum. There are many users of this brand on that forum.https://smtnet.com/Forums/
Help Needed: ESE Lightning Rod Conductor/Arrester Device Manufacturing - Page 1
Forum section: electronics / general

author: Amaan
author_rank: Newbie
timestamp: November 24, 2024, 03:10:35 pm
content: Hi everyone,My name is Amaan, and I have a question regarding the ESE Lightning Rod Conductor (or Arrester). We are currently manufacturing ESE lightning rods, but we have encountered a problem with the internal device (semiconductor) that is part of the lightning rod. Unfortunately, the people who used to make this device for us passed away a few weeks ago, and now we’re unable to find any information about how to make it ourselves.We’ve searched everywhere, but no one seems to know how to make the internal components or what specific materials or technologies are needed to manufacture it.Can anyone provide some guidance or share any resources on how to make the internal device for the ESE lightning arrester? I would really appreciate any help or advice!Thank you so much in advance! 🙏Best,Amaan
Dual Dsub 9 enclosure - Page 1
Forum section: electronics / general

author: dope40
author_rank: Newbie
timestamp: November 22, 2024, 03:22:47 pm
content: Hi, i am currently trying to design a product which i want to put in a dual Dsub9 enclosure, it will be an adapter.this is a example of the cover:https://ibb.co/wKf4r1VThe problem i am having is that all i can find is with this ugly grey colour, i want for it to be black. So the question, does anyone have idea where i can find this in black.Thank you in advance.

author: jduncan
author_rank: Regular Contributor
timestamp: November 22, 2024, 06:00:52 pm
content: https://www.blackbox.com/en-au/store/product/detail/Two-Headed-Hood-Kit-DB9-Male-Female/FA805

author: abeyer
author_rank: Frequent Contributor
timestamp: November 22, 2024, 07:46:57 pm
content: Quote from: jduncan on November 22, 2024, 06:00:52 pmName checks out
Suntronic legit? - Page 1
Forum section: electronics / general

author: xbst_
author_rank: Contributor
timestamp: November 16, 2024, 09:43:09 am
content: I need to source a component that seems to be out of stock at all the usual suspect reasonable price distributors. I'd normally source this part from LCSC, but whenever I ask for a quote, depending on their mood or whatever they either say they can't source it, or quote near-Mouser prices. Their usual price at the quantity I need is below 80 cents.Mouser, Digi-key and most of the other western sources want $2+ per, which is way too much. TME is the next best source, but they want close to $1.40. Still more than I'd like to pay.While browsing Octopart, I came across Suntronic. They appear to be a component distributor in China. Their website doesn't look that professional and I can't find any info about them here or on Reddit. They only accept orders via RFQ, but the prices listed on their website is a lot more reasonable, below 70 cents.Did anyone here use them in the past? Are they legit?Link:https://www.suntronic.org/

author: thm_w
author_rank: Super Contributor
timestamp: November 18, 2024, 10:14:50 pm
content: Part number?You can find some ratings here:https://sz-suntronic.en.alibaba.com/company_profile/feedback.html?spm=a2700.shop_index.88.45.4fa851670bGgVj

author: xbst_
author_rank: Contributor
timestamp: November 20, 2024, 06:03:49 pm
content: I asked for a quote as they only accept RFQ. The price is 3X listed.I guess I won't have to take the risk of ordering from them
PCB rework, mini-hotplate to heat specific area beneath module - Page 1
Forum section: electronics / general

author: davegravy
author_rank: Regular Contributor
timestamp: December 06, 2024, 06:50:06 pm
content: I need to desolder a large SMD module from a board and due to the large RF shield on top I can't use (exclusively) hot air, I need to heat from the bottom. I can't use an oven due to plastic components, I need to be targeted with heating. The area immediately below the module is clear but there are obstacles (including plastic ones) nearby so I can't use a hotplate, at least not a standard sized one.Is there such a thing as a mini-hotplate, something around 1" x 1" that the bottom of the PCB can be thermally coupled to below the target IC, maybe with a thermocouple that can be put on the top side for temperature control?Or would it be best to use a regular hotplate with something like an 1" cubed aluminum block to conduct the heat to the desired area?

author: selcuk
author_rank: Frequent Contributor
timestamp: December 06, 2024, 08:24:20 pm
content: Thermally conductive block can be helpful. Or you can try to heat with hot air from the bottom. Similar to the method described below. But not from top of the PCB in your case.https://www.eevblog.com/forum/repair/removing-tqfp-128-package-with-thermal-pad-from-double-sided-board/msg5523502/#msg5523502

author: jpanhalt
author_rank: Super Contributor
timestamp: December 06, 2024, 08:49:40 pm
content: A 1" square x 6" bar of aluminum is about $12 including shipping on eBay in the US. All you need is a short piece + a few spacers. Shipping has gotten so darn expensive, it would probably cost more to ship it to you than you can get it locally. Are you near any large American city, like Detroit?

author: thm_w
author_rank: Super Contributor
timestamp: December 06, 2024, 09:59:01 pm
content: Does 31x31mm fit?https://www.aliexpress.com/item/1005001800667409.htmlThere are also mini PTC heaters that you could tape onto the bottom of the board, though you cannot set a temperature, you just buy whatever preset temperatures they have.
Technique for solderless joining of dupont pin headers to PCBs - Page 1
Forum section: electronics / general

author: JoeMuc2013
author_rank: Contributor
timestamp: November 14, 2024, 11:43:25 am
content: Hiya,I remember seeing a video or thread back in the day where solderless connections were shown. I think it was about a dual-row pin header However, it wasn't the apparent solution pointed out herehttps://www.sparkfun.com/products/retired/10527where the pins have a springy point, it was for the normal solid pins. What I saw was that PCB holes would not line up exactly as usual but every second hole was a tiny bit offset to the side to create a slight zig-zag pattern. Inserting a solid connector where the housing ensures lined-up pins, this would create enough friction to ensure the connector is firmly attached without any soldering involved. The technique presumes that the holes are plated inside of course.Unfortunately I cannot remember the correct term for this to get some more how-to information.Can anybody give me a clue?Thanks a ton! Have a nice day!Cheers,Joe

author: jpanhalt
author_rank: Super Contributor
timestamp: November 14, 2024, 11:50:43 am
content: "Sneaky footprints" at Sparkfun. Right church, wrong pew.https://www.sparkfun.com/tutorials/114

author: JoeMuc2013
author_rank: Contributor
timestamp: November 14, 2024, 12:00:06 pm
content: Yes! That's spot on. Thank you so much!

author: mtwieg
author_rank: Frequent Contributor
timestamp: November 14, 2024, 04:53:27 pm
content: Quote from: JoeMuc2013 on November 14, 2024, 11:43:25 amFunny to see press-fit parts sold as a "Solderless" header for prototyping.

author: Kean
author_rank: Unknown
timestamp: November 16, 2024, 01:18:45 pm
content: As you will note if you read the linked article, this is not intended for solderless connections but to help “lock” the connector in place for “better” soldering.I’ve used these footprints for ages, and while they can help provide a solderless programming or debug header, they are not nearly reliable enough for general purpose use.
LPKF S103 Not Working in Boulder, Colorado - Page 1
Forum section: electronics / general

author: Flyingdancingfool
author_rank: Newbie
timestamp: November 29, 2024, 10:01:42 pm
content: Greetings! Forgive if this is not the correct forum. Make suggestion and I will move post. Thanks, KennGreetings!I was fortunate enough to purchase an S102 from the University of Michigan Med School for 2.5K$ and I received it in a rough state. There was a broken mill tool in the spindle and the spindle head was jammed up against the tool holder.I found a copy of 2.3 and I managed to get the S102 to respond and move away from the tool holder; however, the Med students apparently tried to repair the Z -axis and they forgot to re-install an L-shaped piece of metal that actuates a z-limit switch. So I was getting a “z-axis limit switch error.”I contacted LPKF Tech support in Oregon and they did an initial diagnosis from error messages, noting the L-shaped limit switch actuator was missing. Fortunately I found the L-shaped metal piece in a supplied parts box and I re-installed into proper position. However, the S103 was still in an error state and the software wouldn’t connect to the machine.LPKF eventually provided 2.5 in an attempt to get a proper connection, but that did not fix the problem. Please see attached photos of error messages.(1) Question: Should the spindle “freely” turn, or is there some sort of internal locking mechanism that prevents it from turning? Perhaps a software lock? If the spindle needs to turn and is actually burnt out, would that cause an error message?(2) Is it possible to get the same software that the machine used when it was manufactured in 2011? I would like to try to use an older laptop with the original version software.(3) Do I need to supply compressed air for the unit to properly work?(4) Is it possible to get the factory involved?(5) I am not convinced that it isn’t the firmware, but I did down load and operate some USB monitoring software and I saw something. I don’t know what the data signifies, but it looks like the USB version is not the problem(6) And….is it possible to get a circuit diagram? I am at the point where I want to check voltages. Ive bought (and repaired) a lot of old HP and Tektronix electrical equipment and you would be surprised to learn that they can easily be repaired. And you would also be surprised to learn how many of these old pieces of equipment were deliberately sabotaged. No kidding. Think about equipment/property managers that want to clear out old equipment so they do something like short our a power supply, or my favorite, remove then partially reset an op amp so it stays in position but is electrically isolated.Does anyone have any *Constructive* comments how to move forward and get my machine operable?Thank you!

author: mon2
author_rank: Frequent Contributor
timestamp: December 04, 2024, 01:59:10 pm
content: Suggest to contact the factory reps in the USA. The few times I recall meeting the group from Germany - lady with red hair, they were a very friendly bunch. Raise the same questions with them.You should also post your requests in the smtnet.com user forum.https://smtnet.com/Forums/
Confusing ipc standards Smema srff - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: November 07, 2024, 01:18:31 pm
content: So my cyberoptics SPI and AOI accept SRFF files, but the ones the spi produces aren't accepted by the AOI and I haven't found a way to convert recent IPC stuff to SRFF. Has anyone used SRFF with kicad? My uic machines can export it, but they export an XML version that appears to be newer than the non xml version the cyberoptics machines support. The AOI crashes on SRF files from both the UIC and SPI with no info, so I'm programming it from a basic centroid file but it would be nice to already have the footprint info.
Which PCB coating should I use for PCB permanently submerged in water? - Page 1
Forum section: electronics / general

author: dusan
author_rank: Regular Contributor
timestamp: November 06, 2024, 01:44:58 pm
content: What type of PCB coating should I choose for PCB that is permanently (or periodically) submerged in water? It is low voltage circuit (2x18650 lithium so 8.4V max) and low current (typically 300mA).

author: Slh
author_rank: Regular Contributor
timestamp: November 06, 2024, 01:49:29 pm
content: Probably fully potted with silicone or polyurethane would be appropriate. It might be better to have a waterproof case instead.

author: JimboJack
author_rank: Regular Contributor
timestamp: November 06, 2024, 09:56:40 pm
content: I just think really humid environment at 100% ,I would conformal dip it , like if you were doing a transformer H - temp, can be air dried or oven, UV cured,ideally in a vacumn chamber to ensure no air bubbles ,under any SMT's were moisture be hiding.then water proof case,I use Elantas Elmotherm® 009-0008 for transformer class H rating coating impregnation, thats resistant to acetone,xyelene,methanol,hexane, carbon dosuplhide,some say good mositure resistant some say excellent resistances, you need to check the data sheets and compare remove the marketing team spill.Electrolube, *marine environment. lkisted belowUR5041 – Highly Water Resistant Polyurethane ResinUR5083 – Recoverable Polyurethane GelUR5528 – Tough Polyurethane Resin with Excellent AdhesionI guess how much is submergered etc.