hybridfree/eevblog-posts huggingface dataset:
Metal type for resistive heater - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 11, 2023, 12:34:57 pm
content: Hi,We want to make some resistive heaters.We want their resistance to vary with temperature, so we can measure their temperature, by measuring their V and I .We want to kind of "Lay" them on like a ceramic surface.Can you suggest a good metal for us to use?Copper is no good as its too conductive........woudl be too thin, and would deform, suffer heat damage.

author: Kean
author_rank: Unknown
timestamp: April 11, 2023, 12:37:16 pm
content: Nichrome - commonly available as wire or strip/sheet for heating elements

author: langwadt
author_rank: Super Contributor
timestamp: April 11, 2023, 01:04:16 pm
content: Quote from: Kean on April 11, 2023, 12:37:16 pmresistance thermal coefficent something like 25 times smaller than copper

author: nachus001
author_rank: Contributor
timestamp: April 11, 2023, 01:21:12 pm
content: Hi LangwadtYou can use Cromalfe or FeCrAl wire type (Iron/chrome/aluminium alloy, with commercial names as Kanthal-D, Resistohm, aluchrom etc)This is the most common type of material for toasters, furnaces, cartdridge heaters and the likeand its resistance change can be used to measure temerature, specially when very hot (red hot)CheersNachus
assembling board with spring/coil battery contacts - Page 1
Forum section: electronics / general

author: bentyler
author_rank: Contributor
timestamp: April 04, 2023, 09:11:31 am
content: Say I have a design like the board in the first photo. The battery contacts have a bend at the end in order to be soldered in a slotted through hole, as well as a bend to fit into the battery housing. Do pcb houses like pcbway do the bending of the contacts, or will I need to have custom contacts made?

author: Psi
author_rank: Super Contributor
timestamp: April 04, 2023, 10:13:11 am
content: You could get PCBway to bend them, but you'd have to provide enough info to ensure they get it right. Which might be tricky if they cannot test it.Ideally you would send them a jig that they can use to bend them and another jig to hold them in the right position while they solder them.But I guess you could spec the exact positions and angles they need to bend them in a document and let them figure it out.I dunno what they would charge for that though, or how good the result would be.If you are getting pcbway to put the board into the enclosure then you might be able to get pcbway to bend them by hand using pliers to "make them fit".as part of the assemply step, but you are taking a chance they may not do it how you want.If you're not getting pcbway to put them into the enclosures then you could bend them yourself once you get them. They would just need to be soldered onto the pcb at the correct length.But yeah, the best way to do it is some sort of a jig to bend them, or as you say, buy a custom spring that is what you want to start with.
Quick 870ESD 800W Pre-Heat and Reflow hotplate-Anyone used one? - Page 1
Forum section: electronics / general

author: djsb
author_rank: Super Contributor
timestamp: April 03, 2023, 10:40:23 am
content: Has anyone used one of these?https://kaisertech.co.uk/quick-870esd-hot-plate-area-180x200mm-800w-preheater-reflowI've asked them for examples of any companies that use them and if there are any reviews or feedback they can give me before I buy one. It looks like it may also be useful for pre-heating a board whilst using a hot air pencil as well as a kind of mini-oven. I wonder if this would work?I don't want to spend over £100 on an electrically unsafe Chinese hotplate that heats a board unevenly and has to be modified to make it work properly.PS They sell JBC equipment, so I'm hoping that they don't sell stuff that isn't fit for purpose.PPS I've bought one of these, and it will be with me towards the end of the week. I might do a YouTube video review later on. I have to create a SMD based project first. But the whole point of the purchase is to get more SMD exposure and experience.

author: wraper
author_rank: Unknown
timestamp: April 03, 2023, 10:49:17 am
content: Quick makes good equipment, so I guess it should be OK.

author: thm_w
author_rank: Super Contributor
timestamp: April 03, 2023, 09:26:24 pm
content: The chinese IR preheaters are OK. Of course you have to check that the metal enclosure is properly earthed when you receive it, but that is about it.https://www.aliexpress.us/item/3256801975583788.htmlhttps://www.eevblog.com/forum/manufacture/has-anyone-tried-any-of-these-china-pcb-preheaters/
JLCPCB P&P files - Page 1
Forum section: electronics / general

author: Robaroni
author_rank: Frequent Contributor
timestamp: March 22, 2023, 01:15:33 pm
content: Hi,Trying to send P&P files to JLCPCB using Proteus 8.15.JLC has a downloadable .bomt but when I tried to load it into Ares it wasn't accepted. Anyone sending P&P to JLC?Thanks for the time and help,Rob

author: phil from seattle
author_rank: Super Contributor
timestamp: March 22, 2023, 06:33:17 pm
content: Take a look at the samples for BOM and Place files. They are using a new version of their processing software and made some tweaks to the place file format that caused me trouble. Also, they seem to have gotten pickier over XLS formats, you might try CVS instead.

author: JLCPCB Official
author_rank: Regular Contributor
timestamp: March 27, 2023, 10:34:56 am
content: the information for reference:https://jlcpcb.com/help/article/69-How-to-generate-BOM-and-Pick-&-Place-File-in-Proteus-8.9

author: Robaroni
author_rank: Frequent Contributor
timestamp: March 27, 2023, 01:15:30 pm
content: Thanks Phil,You're right. I finally got it to work only to find they don't have the parts in stock! They say they are fixing the software problems though.
MY500 - Page 1
Forum section: electronics / general

author: SeanMollet
author_rank: Newbie
timestamp: April 26, 2023, 12:14:39 pm
content: We do a small amount of production (12k board/year) and a fair amount of prototyping. I setting up our first line now that CMs have gotten so difficult for prototypes.I really want to buy a used MY500 jet printer.Anybody that's got one have any negative feedback? I've found one with low hours that has the 2d inspection feature, which I mostly consider mandatory.

author: SMTech
author_rank: Frequent Contributor
timestamp: April 26, 2023, 12:33:07 pm
content: Quote from: SeanMollet on April 26, 2023, 12:14:39 pmWell I can give you a direct quote from Mycronic in 2019 when I asked about them, specifically I was was asking about 2nd user units because they have this habit of do one off offers on refurbs that used to show up in my email.Quote
schematic+layout+fab express service? - Page 1
Forum section: electronics / general

author: dav888
author_rank: Regular Contributor
timestamp: March 26, 2023, 10:43:08 am
content: Noted that pcbway has a sch+pcb layout service. has anyone tried it?I've been looking for a service where you can just upload a hand drawn block-schematic and get a fabbed pcba back.Upwork "works", but too much hassle as the risk is on you picking the right person. Also few offers the manufacturing part as its mostly soft-services there.

author: sam512bb
author_rank: Regular Contributor
timestamp: March 26, 2023, 04:43:09 pm
content: Good day,I hope you are not expecting too much and/or the design to work given what you are planning to provide to the vendor. In the end... garbage-in results in garbage-out. There are far too many variables and details needed for a successful design beyond a block diagram style of schematic, let alone a successful and quality PCB layout. If anything I would suggest you create a formal schematic detailing all the parts/connectors (complete part numbers so as to know the part footprint), all of the interconnections, and include PCB layout notes (critical traces/lengths/layers used, PCB physical size, layer count, mounting holes or not, soldermask/silkscreen color... and PCB stackup if more than 2 layers, etc) and/or design documentation package.Ultimately, the more info and details you provide will increase the chances of having a working PCB and/or a PCB that meets your expectations.Cheers,Sam
Cannot identify  SOIC8 with 7 pins.? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: March 20, 2023, 12:16:55 pm
content: Hi,We have a 7 pin SOIC8 ...labelled as follows.."W163B-33N24U002APSM23"Do you know what this might be?...we cannot find on the web.(Suspect its like a high voltage (eg 300-400Vin) Buck...like the LNK302)

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 20, 2023, 12:24:38 pm
content: Lots of Chinese PSU chips in that sort of package. LCSC may be a good place to start

author: Faringdon
author_rank: Super Contributor
timestamp: March 21, 2023, 06:52:42 am
content: Thanks, i tried LCSC, but it doesnt know either.

author: wraper
author_rank: Unknown
timestamp: March 21, 2023, 07:05:57 am
content: Is there any logo?

author: JacobPilsen
author_rank: Regular Contributor
timestamp: March 22, 2023, 05:47:20 pm
content: Do you know this page ?https://remont-aud.net/ic_power/
Thermaltronics M series tips failing more often than expected - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: March 19, 2023, 12:21:04 am
content: So I've had 2 thermaltronics tips fail sooner than I would have expected given the quality of the brand.The tips are the 13.56 MHz curie style.All tips were purchased from a legit supplier. (RS Components)One lasted about a year and the other lasted less than a month.Seems very odd, I don't use them that much, maybe 8 hours a week.My station is the TMT-9000PS.Anyone know what might be happening?Also, do Metcal tips work in the thermaltronics TMT-9000PS? maybe I should try those instead?They look identical.

author: thm_w
author_rank: Super Contributor
timestamp: March 20, 2023, 08:46:19 pm
content: Less than a month, contact them to see if they'll cover it under warranty. Mention the other failed tip as well. Does the coil read as open circuit?Yes the metcal ones will also work as thermaltronics is a copy of those. But thermaltronics is much cheaper for new tips ($18).I've had no issues with the tips, used for years, although not heavily. Mike said he has no issues as well:https://www.eevblog.com/forum/chat/metcal-soldering-tip-pathology/

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 20, 2023, 09:01:35 pm
content: I've had a couple of apparently failed tips actually turn out to be solder blobs stuck up the connector of the tip shorting it out.Not seen any lifetime issues with Thermaltronics - I mostly use two daily and can't remember when I last replaced them - couple of years at least

author: Psi
author_rank: Super Contributor
timestamp: March 21, 2023, 08:37:38 am
content: The first one was a yellow temp knife tip and it went open circuit.The latest one is a red chisel tip. It still reads as connected and it still gets hot but not hot enough to melt solder.
Any used SMT Pick and Place for sale?  - Page 1
Forum section: electronics / general

author: itsrealfast
author_rank: Contributor
timestamp: March 20, 2023, 07:09:30 am
content: Hi,Any machine located in the USA for sale?Thanks

author: loki42
author_rank: Frequent Contributor
timestamp: March 20, 2023, 11:01:27 am
content: Lots? You'll probably do better if you give an idea of type and price. 100s of machines in the USA.

author: itsrealfast
author_rank: Contributor
timestamp: March 20, 2023, 06:19:08 pm
content: Quote from: loki42 on March 20, 2023, 11:01:27 amI am looking for a Kayo A4 or SMT550 or a Juki. My budget is around 10-12kI was thinking of the cheaper Neoden YY1 but I am hearing mixed reviews on it.Thanks

author: sinewave
author_rank: Unknown
timestamp: March 21, 2023, 02:08:29 am
content: What kind of volumes and parts are you looking to put through the machine?
About LPKF S62 configuration files need. - Page 1
Forum section: electronics / general

author: Kevin Liu
author_rank: Contributor
timestamp: March 17, 2022, 07:21:24 am
content: Hi,I got an LPKF S62 and try to install BoardMaster to control it.But I am missing two configuration files named Calib_Result.tbl and S62.ini.Can anyone S62 owner offer me these two files?Thanks.

author: Iron-Man
author_rank: Newbie
timestamp: March 24, 2023, 02:21:37 pm
content: Hello KevinWere you able to locate the files?Thanks

author: mk_
author_rank: Regular Contributor
timestamp: March 24, 2023, 05:52:12 pm
content: Ask LPKF direct, they always answered very friendly.

author: PCBprototyping
author_rank: Contributor
timestamp: March 27, 2023, 10:47:10 pm
content: Calib result and ini file are machine specific, so you need to get them from LPKF or previous owner(they are on CD). The easiest way to install them is to remove boardmaster and reinstall it, it will ask you for the files during installation and install them correctly.
Prototyping SMT assembly set-up - Page 1
Forum section: electronics / general

author: nimish
author_rank: Regular Contributor
timestamp: March 18, 2023, 11:05:42 pm
content: What's the recommended low cost in-house prototype lab PCB assembly set up these days? Need to assemble 0402, QFN and BGA components on outsourced PCBs.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 19, 2023, 07:01:14 pm
content: Solder paste, stocks of solder paste needles (multiple gauges), air compressor and dispensing pump with foot switch control, good magnification (probably camera and screen type rather than optical) with a long focal distance, fine tweezers, some sort of hotplate to let a whole board be warmed up to just below solder melting point for BGA/QFN work, hot air soldering irons, and a temperature controlled soldering oven.QFN and particularly BGA are very nasty because the solder is below the chip and therefore inaccessible to typical tools.0402 will be uncomfortable, nastier than 0603, but very easy by comparison to QFN and BGA.

author: sinewave
author_rank: Unknown
timestamp: March 20, 2023, 02:21:08 am
content: Most PnPs that are fairly small/desktop that can handle BGAs are going to be very expensive and probably worse if you do it manually, the NeoDen YY1 is honestly quite good for prototyping and is around 2.8K USD. If you cannot afford that just get some solder paste, and a good squeegee (preferably metal). You can just use a converted toaster oven as the standard T962 reflow oven is honestly shit, I've heard good things about the PixelPump as a vacuum placement tool. I have found with the YY1, it takes a few boards before it is properly calibrated. (I'm not a NeoDen shill I swear)
Turret punch vs fiber vs cnc routing - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: March 17, 2023, 01:51:39 pm
content: I'm thinking about selling my cnc router and getting a turret punch. Il currently I cut out aluminum on my cnc router and then fold with an amada press brake. The cnc is more than 2 full sheet, 7m long and I'd like to move to something smaller. 2.5m x 1.4 m is all I need. Is anyone here using a turret punch for making enclosures? How about hard tooling? I got some stuff cut with a fiber laser and oxidisation appears to be an issue and they are annoying to clean.

author: thm_w
author_rank: Super Contributor
timestamp: March 17, 2023, 09:37:02 pm
content: CNC turret punch, is that even something you can buy for less than $100k? How many enclosures are you making exactly?https://www.thefabricator.com/thefabricator/article/lasercutting/perfecting-the-fiber-laser-cut-edgehttps://www.oshcut.com/laser-metal-cutting/

author: loki42
author_rank: Frequent Contributor
timestamp: March 17, 2023, 09:53:51 pm
content: I should get a few $ for selling my 4/5 axis 26 kW cnc router. The fibers look around $80k for Chinese 3x1.5 3kW, punches less than that for a used Amada or Trumpf. Less for a used Strippit. Being able to tap on the punch would be nice for me so I can avoid secondary processing. Combined fiber / punch look nice but pricey unless I can find one used under 100k.
Thermal material compatible with reflow - Page 1
Forum section: electronics / general

author: Xtremexp
author_rank: Regular Contributor
timestamp: January 30, 2023, 07:35:35 pm
content: Hello all,I am making a module which needs a thermal pad or thermal interface material. the module will be eventually soldered to the carrier board using reflow method. What are my options to use on such module? does the regular thermal pad survives the reflow temperature?Many thanks in advance.Xtremexp

author: thm_w
author_rank: Super Contributor
timestamp: January 30, 2023, 10:24:18 pm
content: Did you read the datasheet of the thermal pad in question?Search on digikey and you'll see a variety of temperature ranges available.

author: Xtremexp
author_rank: Regular Contributor
timestamp: March 16, 2023, 09:06:14 pm
content: Yes, Almost all thermal pad are rated for maximum temperature of 100C, there are some graphite pads which are grainy and electrically conductive, which is not preferrable

author: wraper
author_rank: Unknown
timestamp: March 16, 2023, 09:12:47 pm
content: This one for example has max working temp of 180oC.https://www.digikey.com/en/products/detail/t-global-technology/TG-A6200-10-10-0-5/11201359Should survive short term reflow temperature just fine, Lower temp thermal pads probably will me fine too but it would be the best to just check them in practice. As of thermal pastes, cheapest alumina powder filler and silicone oil based thermal pastes should be just fine.
Documentation For PCB Testing - Page 1
Forum section: electronics / general

author: Apn15
author_rank: Contributor
timestamp: March 15, 2023, 02:38:23 pm
content: Hello,I am working on making an operations/testing specification for a PCB assembly/testing house, and I am wondering if there are any standards/guides for structuring the testing process.This design will require a specific BOOT sequence, firmware programming, and calibration. Also operational checks.What is the best way to relay all of these parameters to the assembly house?

author: Gribo
author_rank: Frequent Contributor
timestamp: March 15, 2023, 06:11:03 pm
content: There are none, it's your product & procedure. The CM will follow the procedure as best as they can, and if they have issues with it, they will tell you, as part of their NPI process.

author: thm_w
author_rank: Super Contributor
timestamp: March 15, 2023, 10:20:09 pm
content: Quote from: Gribo on March 15, 2023, 06:11:03 pmYes, it is on OP to write up the procedure. Step by step documentation with photos, screenshots, etc.Then either some template printed form if you want to record the cal data, date, serial number, and have them write it in. Or better, record the cal an operational check data with your PC based test app.Its possible they won't mention issues to you if it is not very clear in the procedure what is or isn't an issue. So if you say: "Press the Program button", "Must see program verified OK, then continue" then it should be clear not to just proceed if it gave some program warning but went on to pass functional test (just an example).
Knob cap for the low-profile rotary encoder - Page 1
Forum section: electronics / general

author: pcbcrew
author_rank: Contributor
timestamp: March 05, 2023, 08:36:01 pm
content: I am designing a motor controller board.Due to low height of the 7-segment LED modules, I am gonna use a low-profile rotary encoder ALPSALPINE EC12E1240301https://www.lcsc.com/product-detail/Rotary-Encoders_ALPSALPINE-EC12E1240301_C351235.htmlBut I couldn't find the knob cap for this.I contacted some local shops and sellers who are selling this component.But the sellers didn't know which one is correct item for it.To proceed 3D enclosure design and PCBA prototyping, I need to know where I can purchase the knob cap in mass qty.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: March 05, 2023, 11:47:47 pm
content: I am not sure why you are having trouble. A few minutes of google turned up the following:https://daviesmolding.com/catalog/products/knobs/control/?KnobType=&KnobDiameter=&MountingDiameter=M3.2%20flatted%20to%202.5&MountingType=&MaterialType=I am sure that there are dozens of others, including many with lower costs than Davies who look like they want over a dollar each in 3000 quantities. Key is looking at the data sheet for your part and seeing the dimensions on the shaft.

author: pcbcrew
author_rank: Contributor
timestamp: March 06, 2023, 12:13:00 am
content: Quote from: CatalinaWOW on March 05, 2023, 11:47:47 pmThanks for the reply.I tried to chat with some of the sellers, but none of them knew if it will fit or not.Is there any standard specifying common axis shape and dimensions for rotary encoders?

author: CatalinaWOW
author_rank: Super Contributor
timestamp: March 06, 2023, 05:07:07 am
content: I don't know if there is a standard for rotary encoders, but the data sheet for the coder you specified a 3.1 mm D shape shaft with the dimension across the D of 2.1 mm (by memory, I didn't return to the data sheet). That size with a spring should do fine on your encoder. Davies is just the company that works with Mouser. If you have large volume you should be able to go directly to knob manufacturers. I am sure there are several in China that would be lots cheaper

author: pcbcrew
author_rank: Contributor
timestamp: March 15, 2023, 08:57:14 pm
content: Thank you!
Fun project with high voltage capacitor - Page 1
Forum section: electronics / general

author: pisoiu
author_rank: Regular Contributor
timestamp: March 14, 2023, 10:25:33 pm
content: Hi all,I never worked with this type of capacitors, so I need a bit of advice:https://www.ebay.de/itm/313841877950I can't tell if the 1k eur price is ok or not, I have no reference. I looked for it on AVX but they don't seem to have this part on their web page. There are TRAFIM products on their site with part# DKTFM1/2/3/4, but this part is DKTFM7.Do you think they are ok for using it in high energy pulsed discharge applications like can crusher, melting things for youtube, etc?I am very well aware that they are deadly, I know what to do about that, I built tools working at 30kv but not with that much energy in them.Thanks.

author: jonpaul
author_rank: Super Contributor
timestamp: March 15, 2023, 12:11:36 am
content: €1000 way high, this is a specific purpose cap eg induction heater or broadcast or PFC.For DIY HV DC fiddling look for plate supply amateur transmission or B+ caps,We have bought many 0.1 uF....500 uF 1000v..25 kV at Ham fleas or auctions for $10..50Jon

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 15, 2023, 03:27:58 am
content: I mean, that's an okay price for what it is and does; but what it does is not what you want to do. It probably won't last long under that kind of service. Broadcast, hmm or PFC, yeah, something like that. We never used voltages that high for induction heating.Tim
Looking for Free Sheetmetal forming software  - Page 1
Forum section: electronics / general

author: connectTek
author_rank: Regular Contributor
timestamp: March 11, 2023, 08:31:05 pm
content: G'day GuysHas anyone got experience on any decent free software to make metal/ Aluminium enclosures?I have a pan and brake and would like some software that helps with design.Cheers.

author: loki42
author_rank: Frequent Contributor
timestamp: March 11, 2023, 10:18:39 pm
content: I use fusion 360 for the cad section but they don't have cam for sheet metal. If you want to know if the dies / punch you've got can form the part without interference you'll need something else. Should be fine for most pan stuff though.

author: phil from seattle
author_rank: Super Contributor
timestamp: March 14, 2023, 02:33:30 am
content: F360. The sheet metal module works great. create the object and then flatten it out. Lots of good tutorials out there. I believe you can get a DXF from that or use it as a sketch. I've usually just cut the sheet metal by hand, though.

author: MR
author_rank: Regular Contributor
timestamp: March 14, 2023, 08:54:27 am
content: FreeCAD also has a useful sheet metal workbench.However be careful with complex designs, FreeCAD does not perform well on complex objects (and always make backups).

author: loki42
author_rank: Frequent Contributor
timestamp: March 14, 2023, 11:17:51 am
content: Do any of them have cam? I really like to know if I can make stuff with the tooling I've got or I'll need a different shape punch to not collide.

author: MR
author_rank: Regular Contributor
timestamp: March 14, 2023, 12:07:25 pm
content: FreeCAD has, to a certain degree. F360 too, but it doesn't do rapid moves as far as I know in the free version. However if you do something serious a subscription should be worth it.FreeCAD is more difficult to learn, and more complicated in some areas. F360 is more efficient I would say (I'm mainly using FreeCAD though).

author: loki42
author_rank: Frequent Contributor
timestamp: March 14, 2023, 12:37:38 pm
content: Oh I haven't found any press brake cam in fusion 360 before. Handy if they've added it. I'd like something the can work out the bend order and if it needs a goose neck punch etc. Exporting in amada format a bonus.
Via-in-pad on a flexible substrate? - Page 1
Forum section: electronics / general

author: angust_uk
author_rank: Regular Contributor
timestamp: March 10, 2023, 12:57:46 pm
content: Hi allI am designing a flexible PCB which includes a 0.35mm pitch BGA device (https://www.ti.com/product/AFE4432). The manufacturer provides Gerbers for its evaluation board (image below) where they include vias in the pads, as otherwise clearance isn't sufficient to add traces between pads.However I have checked with our usual PCB manufacturer and they do not support via-in-pad for flexible PCBs. Before I go and ask every PCB supplier I can Google, does anyone know if this is even possible? If not, are there any alternative options (other than not using this device)?

author: AndyC_772
author_rank: Super Contributor
timestamp: March 10, 2023, 01:50:15 pm
content: Given the size of the solder joints, I wouldn't even consider putting a device like this on a flexible substrate. It's just asking for joints to crack and become intermittent.If at all possible, I'd stick with components that can accommodate a small amount of bending, ie. SOICs, or passives that are constructed with soft terminations. Not BGAs, QFNs, or similar packages that have no capacity to deform.

author: angust_uk
author_rank: Regular Contributor
timestamp: March 10, 2023, 02:08:19 pm
content: Thanks for the reply. I wasn't sure about the reliability, but sounds like I need to rethink! In this case I maybe able to include a rigid section for this part, though I do still need to find a manufacturer who is able to do via-in-pad, if it is even possible!
manufactured JLC PCB trace/connectivity weirdness - Page 1
Forum section: electronics / general

author: src1989
author_rank: Contributor
timestamp: March 22, 2023, 11:42:39 pm
content: I designed a 5V LED PCB (The BigClivicle), which flashes LEDs with a PIC micro. I've so far assembled about 50 of these without a problem.this one icicle has such a problem: several of the segments don't light at all, or sometimes they light dimly.initially i thought it i'd cooked the LEDs or the PIC by keeping the iron on too long. replaced them. problem persiststransplanted the "dud" PIC and LEDs to another PCB, and they worked perfectly.thought it could be flux residue; cleaned it off with IPA solvent. problem persists.re-did the solder joints. problem persists.bleeped the traces out and everything connects where it should, and nothing shorted...what can i try next?

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 23, 2023, 12:18:20 am
content: Just don't bother saving a cheap pcb?

author: Kim Christensen
author_rank: Super Contributor
timestamp: March 23, 2023, 12:55:30 am
content: QuoteYou must have missed something. Check it using "ohm" mode instead of the "beeper" mode. A low ohm resistor (33ohm) will "beep" and a high resistance one (100K) will not beep, giving you a false sense of confidence that all is OK when it's really not.

author: n4u
author_rank: Contributor
timestamp: March 24, 2023, 11:07:26 am
content: Maybe you provide high resolution image and show us. Maybe there is less soldermast and u short sth when soldering ?
Pse help identify diode....QE1J/ diode in SOD123? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: March 16, 2023, 10:20:25 am
content: Hi,Please help i have a SOD123 diode on a PCB...its marked QE1J\.Any ideas.?Google doesnt know.

author: mikerj
author_rank: Super Contributor
timestamp: March 16, 2023, 12:00:55 pm
content: E1J is a 600v fast recovery diode in a SOD-123 package, is the first letter definitely a Q?

author: Faringdon
author_rank: Super Contributor
timestamp: March 16, 2023, 09:33:25 pm
content: Thanks, i'll check again tomorrow.
Another Q about stencils - Page 1
Forum section: electronics / general

author: pan
author_rank: Contributor
timestamp: March 06, 2023, 01:52:23 pm
content: Hi,Up until now I have bought ready framed stencils from Alpha (and also some from JLCPCB). It depends on customer requirements and type of boards. Now I am considering to buy 23" Vector guard or TensoRED to save storage and also maybe a little bit of money in the longer run.Where do you buy your stencils? And how much do you pay? Would be nice to have some good alternatives which are compatible with the mentioned frames. The stencils from Alpha are very good, but do cost quite a bit.Best regards,PAN

author: SMTech
author_rank: Frequent Contributor
timestamp: March 06, 2023, 02:21:34 pm
content: Can't see your location.. but all suppliers seem to charge much the same for VG style stencils, in the UK that is about £145 per stencil delivered, and somewhat less for the Tecan genesis foil stencil. Alpha were certainly more expensive but I don't have a recent quote as their UK agent was in flux last time I asked around. 20 years ago all our stencils were Alpha, (framed) still use quite a few of them.Lingva in Slovenia is the ultimate source for one of our suppliers and they are very quick. Tannlin (who make the laser equipment others use are good too and originally came up with VectorGuard) as are Tecan (stencils.co.uk). Generally I switch to Tannlin if I think a board is complex, they are more likely to to feedback on stencil design, thickness & special requirement like stepped stencils, Lingva will apply aperture adjustments for you and things like that but don't seem to offer advice unprompted or do the sexy stuff.

author: pan
author_rank: Contributor
timestamp: March 06, 2023, 02:41:14 pm
content: Thanks!That was some good info. I will check them out. All of them in Europe as well.Regarding Alpha stencil and cost it adds up to about 260 Euro (including shipping). I order directly from Alpha, but gets an invoice from their distributor/reseller. So it does not hurt to seek other solutions.
Pick & place Charmhight CHM-T36VA vacuum calibration procedure needed - Page 1
Forum section: electronics / general

author: jrgandara
author_rank: Contributor
timestamp: March 02, 2023, 02:48:46 am
content: Hello all!Does anyone here in the group have experience with the pick& place Charmhight CHM-T36VA vacuum calibration? The manual does not explain the adjustment procedure and the description is dubious. I've tried asking for support with the manufacturer but no one responds.Any suggestion is welcome. Thanks!JR

author: DLE
author_rank: Contributor
timestamp: March 03, 2023, 03:17:33 pm
content: I have one, but haven't had to calibrate the vacuum. I'm not sure specifically what you need to do, but the secret menus have a lot of the functions you are probably looking for.Have you joined the google group on the sparkfun page related to the 36VA? There is a ton of good content on there that helped me get mine going reliably.
Yamaha YVL88ii give away - Page 1
Forum section: electronics / general

author: glenenglish
author_rank: Frequent Contributor
timestamp: February 24, 2023, 03:51:32 am
content: Who ever wants it come and get itYamaha YVL88ii with very low hours, working. good option if you are tired of chinese software.Before I had it, Australia CM had it. Built 2002. full manuals and tech manual, lots of doco. easy to get spares out of Asia for.I have a few spares for it, has full load of nozzles, some new.No feeders (they're CL) , i have already moved them.-glen (I bought a new Samsung Hanwha) .Canberra ACT.You'll need a truck that can haul 1600kg , and probably at least a 3t forklift to lift it in, or a telehandler (which the hire place is nearly next door) , as most tail lifters wont lift this much.YVL88ii is a universal mounter, can mount.,. anything , 0402s are easy. 50mm long connectors, easy. . two wide spaced heads, 6000 cph.

author: asmi
author_rank: Super Contributor
timestamp: February 24, 2023, 07:35:21 pm
content: Quote from: glenenglish on February 24, 2023, 03:51:32 amAnd thenQuote from: glenenglish on February 24, 2023, 03:51:32 am

author: NF6X
author_rank: Unknown
timestamp: February 24, 2023, 08:28:02 pm
content: My pickup truck could haul that on a trailer, but it doesn't float very well.

author: Kean
author_rank: Unknown
timestamp: February 26, 2023, 02:36:53 pm
content: Quote from: glenenglish on February 24, 2023, 03:51:32 amHmm... tempting... and one of my clients is in the freight/shipping industry with a branch in Canberra...I already have two hand-me-down PnPs, so why not a third? Mainly a lack of space...

author: NF6X
author_rank: Unknown
timestamp: February 26, 2023, 08:19:02 pm
content: I hope that whoever adopts it shares lots of photos and/or videos of their adventure.

author: shapirus
author_rank: Super Contributor
timestamp: February 26, 2023, 10:40:16 pm
content: Might nicely serve as a subject of somebody's teardown tuesday video.

author: NF6X
author_rank: Unknown
timestamp: February 26, 2023, 11:25:23 pm
content: Maybe find it in the trash room on April 1?

author: mairo
author_rank: Unknown
timestamp: February 27, 2023, 01:39:27 am
content: I would say no, although you never know. The exercise to relocate such heavy item if you do not have already the machinery to do it is quite high (~$1-3k) + I think he may not even have the space for it?

author: NF6X
author_rank: Unknown
timestamp: February 27, 2023, 01:48:51 am
content: I agree that it is quite unlikely that Dave would adopt this machine. But it would be pretty neat to watch if he did. Even if he could fit it into the bunker, would he be able to power it in there?

author: glenenglish
author_rank: Frequent Contributor
timestamp: March 01, 2023, 12:48:29 am
content: There should be lots of YG and YV machines being given away around the place.... and they use low cost CL feeders reliably.....the Asian machines from some of the used market vendors are well refurbished and known to work. If getting a 'give away' machine it might work, or might just need an air solenoid ....
T-962A - how to adjust for more PCBs? - Page 1
Forum section: electronics / general

author: Yellofriend
author_rank: Regular Contributor
timestamp: October 12, 2022, 09:00:15 am
content: I have that T-962A reflow oven (thank you for your condolence) which actually sort of does the job after changing to the "United Engineering 0.5.1" firmware. So far no complains.My PCBs are quite small, like 50 x 50mm. I always do lead-free Sn96.5 Ag 3.0 Cu 0.5. I lift the modules about 1.5mm so they are not directly on that metal tray. All good so far. Excellent soldering, PCB not overheating.However, when I put more then 1 module the soldering becomes less even. Solder looks partly 'bally', or 'underheated'. Not sure if the oven have different heat zones.Anybody have experience with larger modules and lead-free?I am not sure, go hotter, or extend the time, here my core settings:230°C > 0-220s (I removed all the ramp up steps)245°C > 230s248°C > 240s248°C > 250s240°C > 260s220°C > 270s...and the ramp down goes on...Suggestions are welcome!

author: jpanhalt
author_rank: Super Contributor
timestamp: October 12, 2022, 09:08:53 am
content: Have you calibrated and adjusted the offsets fr the two thermocouples? The offsets can be large.I did mine with a reference TC (Fluke) poked through from the bottom and got both side reasonable close. The biggest PCB I have done was 2" (50 mm) x 3.2" ( ca. 80 mm). BTW, I check my Fluke occasionally against some old laboratory mercury thermometers.

author: Pinkus
author_rank: Frequent Contributor
timestamp: October 12, 2022, 11:05:57 am
content: The T962 is useless for this - sell it and get the larger T937. This is ideal for soldering many boards at once (just keep about 4-5cm / 2 inches of each side clear).

author: JURP
author_rank: Contributor
timestamp: October 12, 2022, 04:49:24 pm
content: And did you reach the desired temperature?My T962A with modifications if running at 100% will only reach 222-224° in 240s.The furnace is underpowered. I'm baking in lead and had to tilt the temperature curve to slow ramps. But other than that, I was quite happy with the furnace.

author: Yellofriend
author_rank: Regular Contributor
timestamp: February 27, 2023, 08:12:55 am
content: Update:I didn't feel comfortable about increasing max temp (now 248°C) or time at max temp, so I simply increased the "soak" time by 10 Seconds and larger boards solder well.

author: sinewave
author_rank: Unknown
timestamp: February 28, 2023, 11:19:07 pm
content: Most components are rated for 260°C and above, so if you still have issues, raise the max temp to 260°C. I have a T962 and struggling with the same issue, one board is fine but more than one or a panel doesn't work well
how to buy LiitoKala batteries and chargers direct - Page 1
Forum section: electronics / general

author: jmelson
author_rank: Super Contributor
timestamp: February 21, 2023, 03:33:30 pm
content: I am working with an outfit that is making lighted safety vests and they are going into production. They need to buy batteries and chargers in bulk. The selected manufacturer is LiitoKala, and they can buy lots of these on AliExpress, but they'd like to buy direct from the manufacturer. They have already purchased a lot of 250 batteries and chargers, but need more for their next batch. Does anyone know how to contact LiitoKala directly? Outfits like aliexpress want to make it as hard as possible to bypass them.Thanks in advance!Jon

author: Jackster
author_rank: Frequent Contributor
timestamp: February 21, 2023, 03:42:05 pm
content: I have engaged with them a few times on Alibabahttps://liitokala.en.alibaba.com/AFAIK their main B2B website ishttp://liitokala.com.cn/Consumer one ishttp://www.liito-kala.com/Personally would go via Alibaba until you have a decent relationship..Note, not actually bought from them directly yet, only via AliExpress.
Feederfinger, copy of Mydata solution? - Page 1
Forum section: electronics / general

author: jayx
author_rank: Regular Contributor
timestamp: February 17, 2023, 12:09:41 am
content: I’ve come across an interesting upgrade for various P&P machines feeders, called feederfingerIs anyone using it? Is it any good?By the way I’m surprised that they got it patented, Mydata (now Mycronic) is using very similar solution for over 20 years in their Agilis feeders, which seems to be based on Nitto patent according to this posthttps://smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=5094&#Message19702

author: pan
author_rank: Contributor
timestamp: February 17, 2023, 12:38:43 pm
content: I also would like to know more about this. I did write an email some time ago with some questions, but I have not received any answer yet. It would save some time if it works as announced. And for trying it out I am willing to purchase a pack of 8 for my Hanwha 2mm pitch pneumatic feeders, but they have been out of stock for quite some time. Did not get any response to when they would be available.
Selective (wave/ fountain style) soldering - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: January 18, 2023, 10:03:50 pm
content: Anyone got a preference on brand? Pillarhouse is the main one in looking at. Also contemplating ace kiss and juki. Is an inline system worth it? How are you running the inline systems, after auto insertion?What's programming and maintenance like? Do they need bottom side fiducials?

author: loki42
author_rank: Frequent Contributor
timestamp: January 23, 2023, 08:35:44 am
content: Got a quote back for a new pillarhouse. Looks like it'll be around USD$65k. So used is a bit more likely... I'll also have to look into nitrogen. The generator from pillarhouse is pretty pricey. Do people go for tanks?

author: loki42
author_rank: Frequent Contributor
timestamp: January 28, 2023, 01:01:26 pm
content: Ended up deciding between ebso and juki. Ebso I can get locally so I think I'll go with that unless anyone has nightmare stories. It's batch not inline so it's harder to automate than the inline machines I've looked at.

author: mon2
author_rank: Frequent Contributor
timestamp: January 29, 2023, 01:34:20 pm
content: Have a look at this line - from my last discussion, they start around $20k-$30k USD range and are being well received:https://www.sasinno.com/Update this thread with any feedback / reviews on the same.

author: loki42
author_rank: Frequent Contributor
timestamp: February 12, 2023, 12:19:49 am
content: I've bought the Ebso from Suba engineering. It's a batch machine so it won't have as high throughput as the inline stuff I was looking at but it comes with training and installation. I still need to with out nitrogen, if bottles are fine or if I should look into a generator. I'm going to need nitrogen for the selective solder and the laser, reflow is in air.
PCB Pins - Page 1
Forum section: electronics / general

author: Tnixsw
author_rank: Contributor
timestamp: January 18, 2023, 12:56:26 am
content: Hi all,I have a small project which will be used to replace an old 0.3" DIP ROM IC. The circuit board is just a little bigger than the original IC and it needs to be soldered into the original PCB or plugged into an IC socket.Does anyone know if there are pins available that can be soldered to the replacement board to mimic IC pins?cheersTony

author: themadhippy
author_rank: Super Contributor
timestamp: January 18, 2023, 01:17:27 am
content: 0.1 headers?,this sort of thing

author: gorignak
author_rank: Newbie
timestamp: January 18, 2023, 01:25:13 am
content: They even come in surface mounthttps://www.harwin.com/products/M20-8771246/.

author: Tnixsw
author_rank: Contributor
timestamp: January 18, 2023, 01:33:03 am
content: I tried IDC pins, but they are too thick for insertion into IC sockets. I tried some machine pins also, but the ones I tried have shoulders machined into them and hold the board too high off the original. There are also some with molded ends that slide over the PCB, which after soldering, you can then bend the pins to right angles, but then the pin width across the board moves out to 0.4" or more, so not suitable.The pins must be around, I've seen pre-assembled boards on the web that have them, I just haven't been able to find similar.cheersTony

author: srb1954
author_rank: Super Contributor
timestamp: January 18, 2023, 03:45:12 am
content: Quote from: Tnixsw on January 18, 2023, 12:56:26 amLook at the Samtec TS series headers

author: JURP
author_rank: Contributor
timestamp: January 18, 2023, 06:45:14 am
content: Search for 'Fischer elektronik'part numbers:DIL 16 SMD PK3 GDIL 20 SMD PK3 G

author: connectTek
author_rank: Regular Contributor
timestamp: January 21, 2023, 08:04:07 pm
content: https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.ebay.com/itm/353975567079&ved=2ahUKEwi068G2utn8AhXHQfUHHaWOAUMQjjh6BAgREAE&usg=AOvVaw0a3zPRwec5rEyLzORuaaIq

author: IconicPCB
author_rank: Super Contributor
timestamp: January 22, 2023, 05:22:04 am
content: check out the selection at Rockby, Clayton Victoria .

author: Infraviolet
author_rank: Super Contributor
timestamp: January 22, 2023, 09:01:23 pm
content: I saw a page about these sort of things recently, is this what you were thinking of?https://shop.evilmadscientist.com/productsmenu/855#

author: tooki
author_rank: Super Contributor
timestamp: February 06, 2023, 05:11:07 pm
content: Quote from: Tnixsw on January 18, 2023, 12:56:26 amAre these what you meant?TE 1544425-2https://mou.sr/3XajItkThose go onto the edge of a board, so you do need to design for them.Otherwise, thin machined pins or those nifty ones in Infraviolet’s post.

author: jfiresto
author_rank: Frequent Contributor
timestamp: February 06, 2023, 07:06:21 pm
content: Arethese"too high"?
board handling, conveyors / magazine unloaders which brands? - Page 1
Forum section: electronics / general

author: loki42
author_rank: Frequent Contributor
timestamp: January 29, 2023, 11:08:02 am
content: So I'm looking for an unloader (after the oven). I've got all Nutek gear at the moment but open to any brand. I've avoided Chinese stuff elsewhere but an unloader is non-vital enough that maybe Chinese ones are fine? What brands would people recommend? Basic needs, SMEMA or Hermes, single or multiple magazine unloader, as small width wise as possible. Board size 240x240.

author: loki42
author_rank: Frequent Contributor
timestamp: February 02, 2023, 11:48:22 am
content: Got quotes back from a few brands. Jot is expensive but they are amazing looking. 100% what I'd go for if they weren't 12 x times the price of the cheap options... they do look 10 times nicer but I'm not sure how fancy a destacker or unloader needs to be. I've found a used nutek locally so I'll probably go for that.

author: Reckless
author_rank: Frequent Contributor
timestamp: February 03, 2023, 12:22:06 pm
content: JOT board handling equipment is the best in my opinion from what I have seen. I have a JOT board unloader for sale at low price if anyone interested.I have a Nutek conveyor thats made pretty well. Never gave me issues. In my experience board loading needs equipment than can handle adjusting to perfect timing. Most cheaper manufacturers dont get this 100% right.

author: Mangozac
author_rank: Frequent Contributor
timestamp: February 04, 2023, 01:04:37 am
content: Our Nutek turn conveyor is secondhand and built very well. The only thing to watch is if it has PLC control: if the battery goes flat the program will be lost. Ask me how I know thisGrab or more a suitable RS-232 to USB cable, download the software from Panasonic and do a backup. We were able to get a copy of the software from Nutek, but it was an expensive exercise as they don't keep software for obsolete stuff just on file. Someone had to go and download it out of an old machine!