hybridfree/eevblog-posts huggingface dataset:
Alternative to CNC milled PCBs - Page 1
Forum section: electronics / general

author: kelvne
author_rank: Newbie
timestamp: June 07, 2023, 05:48:30 pm
content: trying to delete my account

author: thm_w
author_rank: Super Contributor
timestamp: June 07, 2023, 09:31:10 pm
content: Etching is the same type of chemicals, just in a larger enclosure with pumps spraying onto both sides of the PCB for faster and more even etch.https://www.alibaba.com/product-detail/Double-Side-pcb-etching-machine-PCB_60113861185.htmlhttps://www.alibaba.com/product-detail/Small-Automatic-PCB-Spray-etching-machine_60048297871.htmlYou can google about via plating:https://www.vse.com/blog/2020/07/16/how-are-pcb-vias-plated/https://hackaday.com/2021/06/11/open-source-method-makes-possible-two-layer-pcbs-with-through-plating-at-home/

author: mairo
author_rank: Unknown
timestamp: June 08, 2023, 12:16:57 am
content: For via plating, you can check what LPKF are offering. They have 'benchtop' machines for that, which can be found for cheap in ebay (older models, but does same job). You can look at theirs manual to see how they do it - seems not too hard, just dipping in different solutions for various time and temperatures (their machines use normal aquarium heaters).https://www.lpkf.com/en/industries-technologies/research-in-house-pcb-prototyping/products/lpkf-contac-s4
edinventory reputable??? - Page 1
Forum section: electronics / general

author: Jester
author_rank: Frequent Contributor
timestamp: May 30, 2023, 10:52:18 am
content: I'm looking for some F280049CPZS no stock at TI or Digi-Key.edinventory is showing stock, has anyone used this vendor?Can they be trusted?

author: SMTech
author_rank: Frequent Contributor
timestamp: May 30, 2023, 12:41:23 pm
content: more a question of can the seller listing on edinventory be trusted....Looking at the claimed stock on Ocotpart, Winsource is mostly trustworthy although they can play games with the price. LCSC.com also has stock and that at least is a straightforward transaction.

author: Jester
author_rank: Frequent Contributor
timestamp: May 30, 2023, 04:57:37 pm
content: Quote from: SMTech on May 30, 2023, 12:41:23 pmAgreed, after I posted this I found the LCSC stock and ordered.Thanks

author: Eng01
author_rank: Newbie
timestamp: June 13, 2023, 03:05:40 pm
content: I personally always use edinventory to find stock of the parts I need.As the previous person said, it is down to the distributors themselves as to whether they are reputable but edinventory for me is the quickest way to find all the distributors of a given part and it is handy for comparing prices and stock
Refurbishing Wave Solder Machine - Page 1
Forum section: electronics / general

author: gmr1981
author_rank: Contributor
timestamp: June 04, 2023, 03:54:52 pm
content: Hi All,I've recently acquired an elderly wave soldering machine for not very much money. It's main advantage is that it has a small solder bath (35kg). I've got a bit of work to do to the machine (I think it dates from the mid 1980's), but one thing I am wondering about is the solder pot itself. It seems to be made of steel, but coated with some kind of reddish coating, much of which appears to have rubbed off with time. I have emptied the bath and it looks pretty ugly, but the solder doesn't seem to stick to the sides at all and I've produced a nice constant wave of solder when the bath was full.Does anyone have any thoughts on:(a) should I shot blast and re-coat the bath with something, if so, what?(b) should I change the single phase motor that generates the wave for a motor with a variable speed?(c) the solder bath and internal structure needed to make the wave look fairly simple, I could potentially completely re-fabricate in stainless steelAny thoughts appreciated.P.S. The machine is a British made "Soldermatic" - no model number, but there was a date code on a control board from 1987, the styling of the machine is definitely earlier though.P.P.S. I used to own one of these professionally about 10 years ago - its solder pot was in a similar state and it didn't seem to cause a problem, the only reason we scrapped it was we upgraded to a selective machine.
0805 Cap, resistor, or ferrite bead - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: June 01, 2023, 07:03:10 pm
content: Hi,An 0805 resistor is the same size as an 0805 cap...so why do all companies have separate footprints for 0805 caps and resistors etc?

author: ataradov
author_rank: Super Contributor
timestamp: June 01, 2023, 07:47:52 pm
content: Because 0805 only describes the outside dimension, not the recommended pad size. Resistors and capacitors have different soldering recommendations.And another side benefit is that you can assign a 3D model corresponding to the actual component type.

author: thm_w
author_rank: Super Contributor
timestamp: June 01, 2023, 09:22:06 pm
content: Capacitors are usually taller. If you google you can find hundreds of discussions about this.https://electronics.stackexchange.com/questions/263129/why-do-kicads-library-footprints-for-0402-resistors-and-capacitors-have-differe
MPM speedline accuflex help - Page 1
Forum section: electronics / general

author: tracepusher
author_rank: Newbie
timestamp: May 31, 2023, 02:24:14 am
content: Hello,I just acquired a used MPM speedline accuflex, manufacture date '07. It didn't come with any documentation- does anyone happen to have service manuals/user manuals for this thing?Also, I haven't powered it up yet- but if it doesn't work right, I assume I'm on my own for repair- I doubt these are supported by anyone, but I could be wrong. Is there any place to get spare parts, besides EBay?Finally, it has a broken hose (pic attached). Does anyone know what this does, or where I can get a replacement?Thanks in advance!

author: Reckless
author_rank: Frequent Contributor
timestamp: May 31, 2023, 04:30:38 am
content: MPM is probably the only SMT company I like for support. They have been supporting my UP2000 models without any fee for years. I would reach out directly to them if you have any technical questionsmpmsupport@itweae.com. One thing I like is their support engineers really love/admire their products and some of them were part of the original design team. DEK support wasn't friendly in my experience which has turned me off of them.
Custom soldermask only on track and pads - Page 1
Forum section: electronics / general

author: yabba235
author_rank: Contributor
timestamp: May 26, 2023, 11:16:51 am
content: Hi !How to get a soldermask like on the main pcb from the photo? Can it be obtained directly from Altium/Kicad or do you have to edit the gerber file?

author: Infraviolet
author_rank: Super Contributor
timestamp: May 28, 2023, 03:29:06 pm
content: Might not be something that can be done automatically with modern processes (that board looks like it might have been a rather old hand drawn design). But in your PCB CAD software you could try copying the wire traces and pasting the copy in to the silkscreen layer (most PCB fabs won't do multi-coloured soldermask), or if the software (like Eagle)won't let objects definedin copepr layers be copied to other layer types then trace over your traces by hand in the silkscreen layer, or export an image of the PCB's copper layer, process it to some appropriate format (dxf maybe) and reimport it in to the silkscreen layer.Actually having solder mask only cover copper traces would be a bad idea, as the alignment won't always be perfect and then you'll have slight slivers of exposed copper to short things to or make shorting while soldering easier, unless you had the solder mask cover the copper PLUS an offset distances around all the copper.

author: Whales
author_rank: Super Contributor
timestamp: May 28, 2023, 04:01:43 pm
content: That board has two silkscreen colours. You are calling one soldermask, this might actually be true (some fabs even use a second soldermask as a silkscreen layer), but just be wary that you might have to juggle terminology to get it accepted and made by a PCB fab company.I don't know if you could do this in Altium, but I suspect you could just with a text editor and the gerbers. Perhaps you could copy the B_Cu.gbr to be F_Mask.gbr and make a few edits to the text, then preview it in a gerber viewer?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 28, 2023, 05:21:17 pm
content: Oh, these should be merged.https://www.eevblog.com/forum/altium/custom-soldermask/

author: CyberCityCircuits
author_rank: Contributor
timestamp: May 29, 2023, 03:25:15 pm
content: Hey there. Normally Soldermask is set to be a 'negative layer' This looks like it wasn't set as a 'negative layer' when generating the Gerber files or the board house didn't set their import correctly.

author: voltsandjolts
author_rank: Unknown
timestamp: May 29, 2023, 03:46:33 pm
content: To the OP, please don't start multiple threads with the same question.https://www.eevblog.com/forum/altium/custom-soldermask/
Yamaha Pneumatic Feeder Slot Usage - Page 1
Forum section: electronics / general

author: daneduplooy
author_rank: Newbie
timestamp: May 30, 2023, 05:06:24 pm
content: I haven't worked with Yamaha pneumatic feeders on a PnP yet (only electric so far) and am busy trying to understand the Yamaha pneumatic feeder "slot usage" - I've been told by a supplier that 12/16/24mm Yamaha pneumatic feeders each need 3 slots (8mm feeder obviously uses 1 slot) - the only way in which I can make sense of this is if the feeders are mounted in the middle of the slot (i.e. "12mm" feeder uses "2mm" either side of the "8mm" slot), but in this case only the first 12/16mm feeder would need 3 slots and subsequent ones next to it would only use an additional 2 slots? Something like the attached? Would someone with experience please confirm/explain?Thanks!

author: Mangozac
author_rank: Frequent Contributor
timestamp: May 30, 2023, 10:41:19 pm
content: Your expectation and drawing is correct. The 12+mm feeders aren't perfectly centred like that but practically it makes no difference to how they take up slots.

author: jmelson
author_rank: Super Contributor
timestamp: May 31, 2023, 03:53:02 pm
content: I had a Philips/Yamaha machine with 8 and 12 mm mechanical feeders and 16+ were pneumatic. But, same issue, the trick is to put all 8 mm feeders together, and then 12 and 16 mm grouped together in every other slot, then the 24+ feeders took up 3 or more slots. If you interspersed 8 and 12 mm feeders then you always lost a slot between them.Jon

author: Smallsmt
author_rank: Frequent Contributor
timestamp: May 31, 2023, 09:14:45 pm
content: Please check out our website for the explanation.https://www.smallsmt.biz/cl-feeder/

author: daneduplooy
author_rank: Newbie
timestamp: June 01, 2023, 09:14:11 am
content: Thanks!The SmallSMT page is perfect and explains everything clearly.
Prototyping HDI with microvias - Page 1
Forum section: electronics / general

author: nimish
author_rank: Regular Contributor
timestamp: May 24, 2023, 08:01:01 pm
content: Do any pcb houses have low cost microvia processes? Chip shortage has forced me to use wlcsp and bga with tiny spacing requirements.Blind or buried vias also work for this application. All I see is VIPPO. This is just a 25mmx25mm board too

author: mon2
author_rank: Frequent Contributor
timestamp: May 28, 2023, 02:44:05 pm
content: LMAO...been there done that and have the t-shirt. For us, it was a madhouse of a learning experience when we built the postage sized PCB (8 pin DIP sized) using the Lattice ICE40UL-1K FPGA with a HDI design.The price ranges for the offers was mind boggling. Had vendors claim they do not even recognize the competition and wanted to charge 3x the lowest offer. Your mileage may vary but the shortcut is to try the following vendor (whom we have used many times for assorted projects and PCBA services - they are medical / automotive certified):QuoteSummary - for a batch of these HDI PCBs in a panel shape we defined, their offer was ~$600 USD whereas the same plotfiles were quoted @ ~1800 USD from other shops in Shenzhen. To Kingford, they stated that HDI is a normal process so there is no premium. You can also consider other shops like Suntak / Founder PCB / Shennan Circuits but they will not deal with you directly. They turned us down on a forecast of $500k USD / annual business on PCBs. Instead they will work with brokers who are pushing out $100k-$300k / month business to them. Ironically, we received a better PCB offer from Suntak through our broker than what we were paying initially to Suntak as a direct account. The trend offshore is to work with fewer accounts but those who can offer higher level of revenue and volumes.Shout back if you need other assistance.
Coil winders available in St. Louis, MO area - Page 1
Forum section: electronics / general

author: jmelson
author_rank: Super Contributor
timestamp: May 28, 2023, 11:37:10 pm
content: A small shop is being sold off piece by piece, and there are two coil winders there. One appears to be a desktop toroid winder, and the other is a pretty large floor-standing regular coil winder. I think it is the toroid winder that is made by Jovil.You can contact Charlie at 3146063301.Jon
Atten versus Quick  (or something else?) - Page 1
Forum section: electronics / general

author: mcconkeyb
author_rank: Contributor
timestamp: May 25, 2023, 09:57:40 am
content: I'm in the market for a new hot air rework station. The 2 contenders are the Atten ST-862D and the Quick 861DW. Depending on when you buy, they are both about the same price (within $100). They both have the same specs. So which 1 should I get?

author: mcconkeyb
author_rank: Contributor
timestamp: May 25, 2023, 07:50:16 pm
content: What's up folks. How come no one has an opinion about this? Surely some of you must own 1 or both of these units.

author: mcconkeyb
author_rank: Contributor
timestamp: May 25, 2023, 08:30:45 pm
content: Maybe I'm asking the wrong question. So let me ask this, what hot air reflow soldering station should a person buy to do repair work and small production runs of simple CCA's (circuit card assemblies)?I'm looking to get a good station, but not the best station. I don't want the $100 versions, and I can't afford the many $1000 versions (looking at you PACE).

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: May 25, 2023, 08:58:43 pm
content: I use an Atten, got it off ebay for about £30.Had it a few years now with no problems.

author: thm_w
author_rank: Super Contributor
timestamp: May 25, 2023, 10:08:25 pm
content: Either one is fine.You can watch SDG'syoutube reviewsand search for threads here, you'll find existing posts.

author: Jackster
author_rank: Frequent Contributor
timestamp: May 25, 2023, 10:30:31 pm
content: The Atten ST-862D is great!

author: daisizhou
author_rank: Super Contributor
timestamp: May 25, 2023, 11:12:00 pm
content: I have been using ATTEN 852D.Atten ST-862D annotates a power of 1000 watts,Actually, it doesn't have much use.Internally, I found that the ST-862D uses a brushless fan instead of the same air pump as the 852D,I estimate that after prolonged use, the sound will be loud, or you may need to maintain it regularly,I prefer the design of the 852D air pump because the working noise is very low after prolonged use

author: wraper
author_rank: Unknown
timestamp: May 25, 2023, 11:48:56 pm
content: Quote from: daisizhou on May 25, 2023, 11:12:00 pmDiaphragm pump like used in ATTEN 852D is an outdated garbage. Very low airflow which is also highly pulsating, so it can blow off small components even at low airflow. Good luck desoldedring power MOSFETs on multilayer boards. Noise for given airflow is high. Blower fan can be noisy, however way more silent at 20 l/min airflow which is a typical maximum for diaphragm pumps. Reliability of diaphragm pump is poor too. Power is not that meaningful figure for hot air station. What's important is if airflow rating is real and if it can actually quickly gain and keep set temperature at maximum airlow.Quick 861 is the original station. Other similar stations like Best or Atten are knockoffs of it, some more blatant than others, Atten ST-862D being one of the least obvious. However many of them are pretty good so can be a wise choice if price is right. On other hand if you want a proven reliability and performance, buy Quick.
Clearance for conductors in offline SMPS - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: May 12, 2023, 10:18:47 am
content: hi,https://alternatezone.com/electronics/files/PCBDesignTutorialRevA.pdf...please could members remind me of the standard for clearances in mains connected SMPS? (what are the required clearances)The above (kindly by Dave Jones) on pg 9 i think is it, but need to check if its in the new EN62368.?I will then pay the $2.4 for 24 hrs access of EN62368 on EVS.EE Estonia.

author: jonpaul
author_rank: Super Contributor
timestamp: May 12, 2023, 08:18:24 pm
content: FTTS: CM or DM? creep? Strike? Mains V? IEC 610004 transients?I think you do not pay $2.40 for a standard ....,J

author: Faringdon
author_rank: Super Contributor
timestamp: May 13, 2023, 09:28:34 am
content: QuoteThanks, pse see attached

author: Faringdon
author_rank: Super Contributor
timestamp: May 16, 2023, 06:13:47 am
content: ..presumably pollution class is not relevant for PCB internal layers?

author: Infraviolet
author_rank: Super Contributor
timestamp: May 16, 2023, 08:31:19 pm
content: Just making a guess here but:Perhaps keep them as far apart as the soldering pins for the relevant connector or other high voltage components are? The connector through which the mains wire enters, or anything else specifcally designed for high voltage use, will surely have been designed with the high voltage pins suficiently cleared from each other and from any lower voltage or earth pins to avoid arcing and/or creepage. If the high voltage traces would anywhere need to come any closer together than that minimum distance they are forced to get down to (where they connect to the connector/component pins), that's when you'd need to find out what the minimum safe separation would be, but the pins they connect to will already be at or greater than that minimum safe separation.

author: dmills
author_rank: Super Contributor
timestamp: May 20, 2023, 07:20:01 pm
content: Follow the standards, this stuff gets subtle, doubly so if your eventual product needs to be recognised by a NRTL....For example, we have a product where there is mains on one side (And some internal planes) of a board and both earth and isolated signal traces on the other, the creepage distances are different between the mains and the two classes of LV trace if you wish to meet UL requirements.Same product with another 'fun' one, because there can be no single component failure resulting in a dangerous condition we were required to ensure we had TWO layers of FR4 between the HV layers and between the HV and LV doings, two cores, or core and prepreg it mattered not, but there had to be two....Yea, the standards are complicated, hard to follow and tend to reference each other in some sort of graph theorists fever dream, but they are also the source of much empirical experience about what can happen and what it takes to prevent it from happening.There is a reason consultants exist in this area, and a reason they are NOT cheap.
JLC no longer able to deliver to PO Box (NZ) - Page 1
Forum section: electronics / general

author: sleemanj
author_rank: Super Contributor
timestamp: May 02, 2023, 10:20:02 am
content: Heads up for fellow Kiwis who use a PO Box.JLC's " global standard direct line shipping" handled by Yun Express have, after manufacturing and assembling and packing and being collected by the carrier, refused to handle the parcel because it's going to my PO Box and so it has now been sitting in some Yun Express facility going nowhere.It's never been a problem before, they were always passed off to NZ Post.More annoying is that I didn't even see the single email from JLC until after a week when I was wondering why the tracking hadn't moved and went digging through emails.So now I have to give them my home address, where if I'm lucky I'll get a card instead of the delivery, if I'm unlucky they'll biff it over the gate or hand it to some rando kid who happened to be walking past as they have before.Harumph.

author: amc184
author_rank: Regular Contributor
timestamp: May 18, 2023, 08:50:47 am
content: Yeah, it's frustrating when international carriers refuse to process parcels to a PO box address when their local delivery partner is capable of PO box deliveries. I've struck this with DHL a few times.

author: JLCPCB Official
author_rank: Regular Contributor
timestamp: May 19, 2023, 07:13:33 am
content: Quote from: sleemanj on May 02, 2023, 10:20:02 amCould you please give me your JLCPCB customer number for checking?
Chinese stencil cleaning machines - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: May 14, 2023, 10:31:30 pm
content: I can't find many Chinese ultrasonic stencil cleaners. I've got quotes for European and American ones but keen to know if anyone is using a Chinese one. If so, how much was it and is it good? Currently using 29" stencils.
Looking for aluminum faceplate / powder coat / screen printing in China - Page 1
Forum section: electronics / general

author: mkiijam
author_rank: Regular Contributor
timestamp: May 13, 2023, 05:46:36 am
content: Hi Guys, any recommendations on top notch supplier? Would need door to door service not just FOB.I have been milling, coating, engraving myself, but would like to outsource.
Unusual SMD stencil - ok to change? ( MAX77751CEFG+ ) - Page 1
Forum section: electronics / general

author: dostr63
author_rank: Newbie
timestamp: April 21, 2023, 02:32:09 pm
content: I'm using a battery-manager chip with an unusual footprint - and it has caused me problems with the solder paste stencil.It has 0.4mm spacing - but some of the pads are double-width (and double-length), and with asymmetrically-shaped additions.The problem is that whilst there's sufficient paste for the smallest pads, there's rather too much for the largest - and I've had solder-bridges *under* the chip.I'm considering getting a new stencil made, but with small/simple apertures for the double/asymmetrically-shaped pads.Obviously these pads are so shaped to reduce voltage drop at higher currents - so a good solder contact area is required.Any recommendations on whether-to/how-to modify the stencil?(I'm using DipTrace PCB CAD, and I'm tempted to change all the pads to simple single-width/single-length - and then to link the double-pads outside of the chip footprint)https://pdfserv.maximintegrated.com/land_patterns/90-100128.PDF

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 21, 2023, 03:17:32 pm
content: I wouldn't worry about too little paste - the minimum uyou need is "some"Too much is more of an issue as the part can float up on it.Probably worth splitting the large pands into a few smaller dots

author: Ihron1000
author_rank: Newbie
timestamp: May 03, 2023, 09:08:42 am
content: Order a thinner stencil.

author: Matt-Brown
author_rank: Regular Contributor
timestamp: May 12, 2023, 12:15:06 pm
content: We have placed that part a few times. You may find that the bridging is on the common leads of the part. We also use a 0.004 thou stencil that is nano plated.P.S you can also change the thick lead parts to have a window pane line (split the large pads parts into 2 singles).
Any prototyping options for rubber overmolding? - Page 1
Forum section: electronics / general

author: rf-fil
author_rank: Regular Contributor
timestamp: May 04, 2023, 10:22:58 pm
content: I would like to avoid major tooling cost for rubber overmolding for a small part. It's for a custom electrical cable, so the overmold will be about half an inch in diameter and a few inches long. The wire is raw (no sheath) so it's rubber over metal. I'm an electrical engineer and I've never designed a part like that. I understand tooling cost might be in the thousands so I want to check my design before I commit to tooling.

author: thm_w
author_rank: Super Contributor
timestamp: May 04, 2023, 10:46:12 pm
content: You can 3D print a mold and pour that:https://markforged.com/resources/blog/casting-3d-printed-partsMight also be worth directly printing the part in PLA and TPU to see how it fits.Probably worth asking the supplier you intend on using as well, unless you are overmolding it in house?

author: Infraviolet
author_rank: Super Contributor
timestamp: May 06, 2023, 07:47:26 pm
content: Is this a part which needs to be rubebr for its flexibility, or is this a part where rubebr is just being used for insulation properties? Part of me wonders if, in the latter case, a rigid part would be good enough for prototyping?
Enamelled copper wire datasheet - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: May 05, 2023, 07:40:14 am
content: Hi,Do you know of any enamelled copepr wire datasheet other than the following?https://www.farnell.com/datasheets/3705631.pdfIs there an AWG version?...or any others?ie, with a family of wires, of increasing diameter, in the table, so you can use it to wind formers.I mean, you can find web pages like the following..https://www.wires.co.uk/acatalog/SX_0140_0180.html....which give all kinds of diameters of ECW, but it doesnt tell you the max outer diameter, and doesnt tell you the ohms/metre....so you simply cannot reliably use it to design a winding schedule with..

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 06, 2023, 12:58:00 pm
content: A quick search for datasheets and pdf's for enamelled copper wire brings up a lot of results. Below is one of them:https://www.scottprecisionwire.com/wp-content/uploads/2021/03/Enamelled-Wire2.pdfAnd they will all be made of copper, so you can pretty much use any datasheet or table for the resistance per meter (or use some calculator).There is quite some difference between different wire brands. Different kind of lacqures are used. Some are optimised for easy solderability, and others are for high temperature applications and may be more difficult to solder. Some even use two layers of lacque, and it may be of two different kinds of laquer too.

author: Faringdon
author_rank: Super Contributor
timestamp: May 06, 2023, 05:57:34 pm
content: Thanks, i like that Scott enam wire datasheet...has more diameters than the one i showed....also showed the insulation rating.Just a shame they dont say who is their distributor....ive emailed them to see how i can buy there wire in small qtys for prototyping.Woudl be great if there were more Insulated Litz wire datasheets...other than TEXELZ which we all know and love.
Need help on SMT802 or TVM802 - Page 1
Forum section: electronics / general

author: tgcoder
author_rank: Newbie
timestamp: May 21, 2023, 11:54:15 pm
content: I just purchased this SMT802 machine a couple weeks ago. It looks very similar to the TVM802. I've spent part of my time trying to understand it so I can run one of my boards thru it. I've come to a halt trying to configure the IC Stack whereby I have several components in a tray. The documentation only shows an example for only one components for each tray. For example, I have 3 components in tray 1. One component at the upper left, another in the center and the last one at the lower right. I would call that Stack1. What would I use for the start and end coordinates? The array would be 1,1 being that only one tray is used. Can anyone show me an example of what the parameters would be?

author: Ihron1000
author_rank: Newbie
timestamp: May 22, 2023, 08:02:18 am
content: You need to point the nozzle at the first component, click remember and do the same on the last component, then specify the number of columns and rows.If the vibrating feeder, the beginning and end are the same , and the column and row are selected 1 and 1.
Source for actual high quality Juki nozzles? - Page 1
Forum section: electronics / general

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: April 22, 2023, 11:01:11 pm
content: I'm sick of dealing with concentric issues on smaller parts, looking for a top tier supplier or Juki nozzles, preferably in the US. Even the 504 sizes I have have enough concentric issues to give problems.Anybody have a good source?

author: Jackster
author_rank: Frequent Contributor
timestamp: April 22, 2023, 11:02:57 pm
content: Not US but these two stores are my go to for Juki nozzles.https://s.click.aliexpress.com/e/_DFfUQn3https://s.click.aliexpress.com/e/_DlKsD0t

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: April 23, 2023, 04:26:11 am
content: Quote from: Jackster on April 22, 2023, 11:02:57 pmOrdered up a set from your second link, will give them a try. Thanks!Still up for any other sources for top quality nozzles.

author: NorthGuy
author_rank: Super Contributor
timestamp: April 23, 2023, 03:05:14 pm
content: Quote from: Rat_Patrol on April 22, 2023, 11:01:11 pmHow do you know that the runout is caused by nozzles? The nozzle holder and the motor shaft will have their own runout. If you rotate the nozzle inside the nozzle holder so that the nozzle's runout cancels the holder's runout, you may be able to achieve better combined runout than you would with perfectly concentric nozzles.

author: Ihron1000
author_rank: Newbie
timestamp: May 03, 2023, 09:40:00 am
content: It is best to sharpen the adapter coupling yourself, on a CNC lathe with a tolerance of 0.01. Then there will be practically no beating.
Problems placing trim pots - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: May 04, 2023, 10:02:25 am
content: I'm having some difficultly handling Bourns tc33 smd trim pots. They seem to miss pick way too often (I'm not getting miss picks on other parts) and when they do sometimes they'll get stuck in the feeder in ways that I have to manually clear. Does anyone have advice on selecting nozzles for trim pots or are their trim pots that are a vaguely similar price but easier to pick?
Finding a Project Box [SOLVED] - Page 1
Forum section: electronics / general

author: jpanhalt
author_rank: Super Contributor
timestamp: April 21, 2023, 05:01:46 pm
content: I am wrapping up a project that has made my Winters pass more quickly. It's a roast thermometer that predicts done time and gives a graphical picture (attachment 1). I began the project in 2018, but it has not been full time. When I began, Pax Instruments sold a temperature logger though Adafruit. I contacted the owner directly, because i liked the box. He sold the parts separately, and I bought just one. It's small (about 2" x4" x 1"), has nice cutouts for my GLCD and buttons, and most important, it has a battery compartment for a prismatic Li-ion battery as used in some cell phones (attachment 2). Now, I have come to the point of needing a few for family members, and the boxes are no longer available from Pax Instruments.I have checked my usual sources: Bud, Hammond, OKW, Pacific, Polycas, and Serpac. I can find similar boxes that could be modified, but nothing with a Li-ion battery compartment (attachment 2).I have not gotten into 3D printing and suspect that may be my best option, but I would welcome other suggestions.Regards, John

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: April 22, 2023, 07:21:48 pm
content: Yup, perfect time to dive into 3D printing I think.

author: edpalmer42
author_rank: Super Contributor
timestamp: April 22, 2023, 07:32:18 pm
content: Did you check PacTec?https://www.pactecenclosures.com/

author: jpanhalt
author_rank: Super Contributor
timestamp: April 22, 2023, 08:27:18 pm
content: I had not looked at PacTec. Thank you for the link. It has some interesting offerings, which might work. One thing I have a hard time understanding is why everyone offers AA/AAA and 9V battery designs, and I can't find supplier that offers a LiPo cell design. Are they just trying to get rid of old stock? Apparently, the actual design is called BL-5C, which is/was used often with cell phones. I did find a few such holders per se on AliBaba, and one could be built into a standard box.As for 3D, one of my daughters teaches at an elementary school that offers classes in 3D printing to 3rd and 4th graders. I am of a generation where we had wood shop in 7th grade.I would like to test a small part that PAX posted on GitHub and see how it comes out before investing in a printer. That daughter is looking into a test run for me.

author: jpanhalt
author_rank: Super Contributor
timestamp: April 26, 2023, 03:37:16 pm
content: Charles Pax has kindly provided some boxes for me. See pictures here:https://www.eevblog.com/forum/oshw/pax-instruments-t400-thermocouple-temperature-datalogger/new/#newEDIT: An update with code and schematics has been posted in that thread.
Vacuum board support for automatic stencil printer - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: April 26, 2023, 06:45:41 am
content: In looking to make dedicated tooling for my mpm stencil printer. We only make 3 different boards and they are the same size panel so I'm planning to make one bit of tooling for them. One board is 0.6 mm and sometimes I have problems with it not being clamped perfectly then sticking to the stencil when it's meant to an snap off.Has anyone got advice for making dedicated tooling? I'm planning to machine it from aluminum. Should I use any form of gasket? Should I gasket off PTH? Anyone got photos of something that works well for them?
Any more triple/double insulated Litz? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 25, 2023, 05:46:21 pm
content: Hi,The below is a table of insulated Litz wire....https://www.furukawa.co.jp/tex-e/en/product/texelz.html...ayk, from this, you can wind a transformer.Does any other company give such a product, with a similar table (with either double ir triple insulated Litz)....?..i have never seen it.Not Rubadue, not MWS, not N.E.W. etc etc
What is CC0603 and CR0603? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: May 06, 2023, 05:42:20 pm
content: Hi,What is the difference between the above two, when they are used to describe a 0603 ceramic chip cap?(I am working somewhere where they have both of these in their pcb layout program)

author: Niklas
author_rank: Frequent Contributor
timestamp: May 06, 2023, 07:11:57 pm
content: Chip Resistor or Chip Capacitor. 0603 only refers to the horizontal dimensions and lacks info about the height of the solder terminals. IPC-A-610 contains info about the required solder fillet height for different acceptance classes, so different pad shapes is one way to achive this, in combination with stencil design and solder paste selection.
SMD part counter recomendations? - Page 1
Forum section: electronics / general

author: rounin
author_rank: Regular Contributor
timestamp: April 23, 2023, 02:47:55 am
content: Any recommendations for smd part counting device? I'm looking for something to help make cut tapes off of reels, say measure out 150 0603s or 50 mosfets off a reel. Also counting parts for end of year inventory, for which reel to reel counting might be nice.I see big name brand desktop units for 2,000 USD that can do reel-to-reel, I'd like something small and handheld if it exists.In the middle price range I guess something like this could work at ~300 USDhttps://www.alibaba.com/product-detail/SMT-SMD-YS-802-Chip-Counting_1600382968993.htmlif anyone has a vendor / part number / feature recommendation let me know. Under 500 USD would be nice.thanks!

author: aeg
author_rank: Regular Contributor
timestamp: April 23, 2023, 04:29:05 am
content: For small quantities like that, I just use a tape measure. 4mm pitch tape = 6.35 components per inch.

author: rounin
author_rank: Regular Contributor
timestamp: April 23, 2023, 04:54:38 am
content: I guess I was over-complicating things. That should work

author: SMTech
author_rank: Frequent Contributor
timestamp: April 23, 2023, 07:52:26 pm
content: Quote from: aeg on April 23, 2023, 04:29:05 amWhy on earth would you measure a metric thing in inches?For EoY, you can use the scale on the side, its rough but good enough for passives. You can also get a digital caliper that does the same thing a bit more accurately probably using a formula like this internallyhttps://www.compuphase.com/electronics/reelestimate.htm.This being onehttps://printtec.nl/contents/en-uk/p3111.htmlbut there certainly used to be other designs, maybe the cheap reel-reel options from China are killing them off.Or Thishttps://www.hackster.io/news/beancounter-is-a-must-have-pocket-sized-smd-reel-counter-31df4ba3c5bfAnd another hack, I like this one, might have to make it.https://hackaday.com/2023/04/15/3d-printed-tool-lets-you-measure-component-reels-easily/

author: rounin
author_rank: Regular Contributor
timestamp: April 23, 2023, 08:14:56 pm
content: Beancounter looks nice, hopefully they do another version that can do wider than 8mm tape. Looks like the fets are on 16mm tape.For now I ordered a 1 meter ruler from mcmaster, good for counting up to 125 fets @ 5 per 40mm. I'm tempted to make my own little optical pulse counting thing to but probably shouldn't spend the time on it...I also like the electronic tape measure hack.

author: MR
author_rank: Regular Contributor
timestamp: April 25, 2023, 11:57:22 am
content: https://protosupplies.com/product/light-block-sensor-module/this works perfectly for paper and black plastic tapes (I used it myself and high speed is no problem). Connect it to a microcontroller and start counting.Transparent tapes however won't work with it, or might need some more fiddling around with it.A sprocket based solution with encoder wheel is probably the safest and quickest universal way.If you do reel to reel - you need to put the tape back to the original one otherwise the holes are on the wrong side don't forget that.
Any options on AiXun P3208 Smart Regulated Power Supply? - Page 1
Forum section: electronics / general

author: heygeorge
author_rank: Contributor
timestamp: April 19, 2023, 06:43:49 am
content: I recently came across this tool， the upgrade of p2408shttps://www.aixuntech.com/product/p3208-320w-smart-regulated-power-supply-32v8a-one-key-boot-power-box-/It seems quite tempting to be honest with that support iPhone 6-14 battery protocols one key boot up, three-channel shortcut setting of current and voltage parameters ect. What do you guys think?
How to transmit multiple high-frequency signals between devices - Page 1
Forum section: electronics / general

author: gailulun
author_rank: Contributor
timestamp: May 02, 2023, 06:51:56 am
content: I'm designing two handheld devices that need to be connected to each other to transmit at least ten high frequency (spread from 0 to 35 megahertz, bandwidth can be reduced but better not) digital and analog signals, some pulsed signals, some are analog level signals that may change rapidly. The ADC for analog signals is 12-bit, the signal level is between 0-3.3V, and the error caused by external interference should be kept within 10mV, so it is necessary to prevent crosstalk between wires and external interference. This means that to minimize the risk of being severely disturbed (I guess) each transmission line should have an individual shield. With 10 coaxial cables, the device would be very bulky and messy, and I'm not sure if a generic D-BUS cable would do the above. The overall line length does not need to be very long (within 1 meter, it can be further shortened according to the actual limit), is there any preliminary feasible solution?
Core loss charts for ferrite? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 15, 2023, 12:02:41 pm
content: Hi,We wish to use an EPC17 transformer for an offline FlybackEPC17https://www.we-online.com/components/products/datasheet/070-4890.pdfWe have chosen these ferrite core halves for it…”PC44EPC17-Z” and “PC44EPC17A080”.This will give an AL value of 80.Ferrite core halves…https://www.digchip.com/datasheets/parts/datasheet/471/PC44EPC17-Z-pdf.phpDo you know where we can find the graphs of core loss (Kw/m^3) vs B for this ferrite, so that we can calculate the core losses?

author: mzzj
author_rank: Super Contributor
timestamp: April 15, 2023, 02:40:38 pm
content: I’d use Google or even Microsoft Bing.Would you like to join evening courses for seniors how to use search engine?Just let us know if you need further assistance. It is such a shame that modern society and greedy corporations push elderly people to work their asses off with low salary in a meaninless job where they don’t any competence or qualifications.

author: Faringdon
author_rank: Super Contributor
timestamp: April 15, 2023, 04:53:19 pm
content: Thanks,PC44 material characteristics are on page 4 of thishttps://www.ferrite.com.ua/power_cores/images/tdk_pc40_pc47.pdf
Can transformer bobbin be trimmed? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 13, 2023, 07:49:49 pm
content: Hi,Can the SMD bobbins of this EFD20 core have the "sticky out bits" trimmed off.?..(the bits that go outside the 23.7mm length)?Or are they needed to solder the wire ends to?https://ferroxcube.home.pl/prod/assets/efd20.pdf

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 13, 2023, 08:28:21 pm
content: Curious, they don't dimension them. But those are most likely the pin tails, yes. You could cut off the unused ones, but that's not much help.Tim

author: jonpaul
author_rank: Super Contributor
timestamp: April 13, 2023, 08:35:19 pm
content: lead term solder tab.Have you never wound a transformer ?
What is "0.55mm Triple insulated wire" - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 11, 2023, 07:01:11 pm
content: Hi,Just done a PI Expert Flyback design.It calls out "0.55mm T.I.W." for the secondary which has 2.1Arms and is 132khz.Do you know what that is? (datasheet)I know of TEXELZ, but that starts with M.O.D of 0.562mm (7/0.1mm)

author: langwadt
author_rank: Super Contributor
timestamp: April 11, 2023, 07:08:29 pm
content: if only someone would make a place to search for such answers,https://www.furukawa.co.jp/tex-e/en/product/texe_series.html

author: Faringdon
author_rank: Super Contributor
timestamp: April 12, 2023, 06:30:09 pm
content: Thanks, but with 2 Amps you'd expect it to be Litz wound, like TEXELZTEXELZ is the only publicly available Triple insulated Litz.

author: jonpaul
author_rank: Super Contributor
timestamp: April 12, 2023, 08:51:54 pm
content: https://www.rubadue.com/our-wires/litz-wires/
Recommendation for China wire harness fabricator - Page 1
Forum section: electronics / general

author: jmelson
author_rank: Super Contributor
timestamp: April 14, 2023, 03:13:51 pm
content: I am helping out a local startup. We thought we had a local fabricator for a wire harness, but they suddenly upped the price by a factor of 5X.This is a really simple job, a 4-pin Molex connector, 4 wires and two LED strips. Can somebody recommend an outfit that can make these? It doesn't HAVE to be China, and a very affordable outfit in the US would be great. The original outfit was quoting us $3 per unit if we supplied the LEDs, and so we'd like to see a price somewhat close to that. Also, it only makes sense to have the fabricator source the LEDs locally to them.Thanks for any references!Jon

author: lamabrew
author_rank: Regular Contributor
timestamp: April 17, 2023, 04:23:51 pm
content: I don't know if they can handle the LED bit themselves or get someone else to do that, I've just used them for simple wire harness/cable assembly. Maybe 3000 pieces total across a couple of different shipments; would definitely go back again.Ask for Betty, she was great to help sort out things when FedEx went south on a shipment as well as status updates, etc.Sichuan Jieyi Electronics Co.,Ltd.E-mail: sales@jieyi-elec.comhttp://www.jieyi-elec.com/Good luck,Brewster

author: jmelson
author_rank: Super Contributor
timestamp: April 17, 2023, 06:06:38 pm
content: Thanks for the link, I have sent them a drawing and am anxious to see what they can do.Jon

author: Ling
author_rank: Contributor
timestamp: April 18, 2023, 08:19:51 am
content: another suggestion is u can try to search on aliexpress with "wire harness fabricator", it will bump out plenty of factory provide such easy service, then choose the best price and service as u wish

author: mon2
author_rank: Frequent Contributor
timestamp: April 18, 2023, 09:26:28 am
content: Reach out to Lilian whom we have used with zero defects for years for our custom cable assemblies:Quote
Surface mount formers for E cores and EFD cores - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 12, 2023, 06:54:44 pm
content: Hi,We cant find any SMD formers for E cores.Only small range of SMD formers for EFD cores.Does anyone make them? (we know about the small range of TDK and ferroxcube ones)

author: jonpaul
author_rank: Super Contributor
timestamp: April 12, 2023, 07:12:41 pm
content: TH only stocked that size.Contact Chinese bob mfg for custom tool, die, pins, expect 3..9 mo dely, MOQ 100kj
Which Aixun soldering station  - Page 1
Forum section: electronics / general

author: Raziel92
author_rank: Contributor
timestamp: December 07, 2022, 07:21:06 pm
content: Which model of Aixun soldering station have the lightest stick and the most flexible cable?Till now im using Xytronic LF-8800 desoldering station and Bakon 950D which i really like a lotWhat I needFlexible cableSmall tickness tips 0.15mmShort distance from tip to the handle

author: thm_w
author_rank: Super Contributor
timestamp: December 08, 2022, 12:11:58 am
content: https://www.eevblog.com/forum/reviews/https://www.eevblog.com/forum/reviews/any-opinions-on-the-aixun-t3a/https://www.eevblog.com/forum/reviews/aixun-t3a-vs-t3b/What you might want is a T115 clone model, as the handpiece and tips are very small.

author: Raziel92
author_rank: Contributor
timestamp: December 08, 2022, 07:20:10 am
content: There are lots of them, the station will be used in audio service, 5-6h per day, 4days per weekWhich one is the most reliable? I also found I2C station which seems to be close clone to JBCMy budget is about 400 euroAlso id like to get station with linear power supply which should last much longer

author: loki42
author_rank: Frequent Contributor
timestamp: December 08, 2022, 10:26:13 am
content: For that kind of money you can get a used Metcal MX500 on ebay. Great handle distance great tip range and they are indestructible. The power delivery great too. I've used mine for soldering down to 0201.

author: Raziel92
author_rank: Contributor
timestamp: December 08, 2022, 04:23:41 pm
content: I would like to buy new stationHelp me to decide, get t3b with SMPS or single/dual t420 with linear power supply?Or maybe I2C will be better choice over t420?

author: robdejonge
author_rank: Regular Contributor
timestamp: April 03, 2023, 06:20:09 am
content: What did you end up getting? And how has it been?

author: heygeorge
author_rank: Contributor
timestamp: April 06, 2023, 09:51:51 am
content: Did you end up buying an AiXun soldering station? Share your experience

author: thm_w
author_rank: Super Contributor
timestamp: April 06, 2023, 08:28:38 pm
content: Quote from: heygeorge on April 06, 2023, 09:51:51 amSee the links in the second post.