hybridfree/eevblog-posts huggingface dataset:
open dvm as an open frame  - Page 1
Forum section: electronics / general

author: pat-mail
author_rank: Newbie
timestamp: November 14, 2012, 04:11:28 pm
content: I just discovering your open dvm project.Great idee !!!I think that projet as a frame :a display (a led, several lines of 7 segments or a unic big graphic LCD ),a keyboard (4 buttons for exemple)and several plugins slots.Theses slots could be locked with screws (safety reason ).For exemple, you can have an unique voltmeter slot, at the early begining...Dont get glued with an unic CPU .Dont get glued with a fix resolution or sample rate.Use a standard very efficient open programing language ( I would choose FORTH , witch is very compact (2kbyte) ).So, the same frame should be extendable without any limitation.The same frame for the hand dvm 3.5digit and the very powerful 1ppm bench dvm and possilbly for the open oscilloscope, the open , the open 64 thermocoupler thermometer, signal generator...!No limitation for the screen resolution, the number off button, the number of slot...Sise can be an very big problem for an pocket dvm but not for an bench dvm.So you can start with a bench dvm ( 0.1% accuracy 4.5 digits for exemple).The slot connector :I would use a small transformer (2 or 3 pins for +5V or +/-5V),2 opto couplers (signal in, signal out) or more (I2C, SPI, ?).It would be nice to use ADC as ltc2400 (24 bits sigma delta less than 10$, ideal for a bench dvm !).I/O pin in a I2C or SPI IC could be used for auto range etc...
News about the Transistor Tester - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: October 25, 2012, 01:31:19 pm
content: Just a few news about the Transistor Tester Project (http://www.mikrocontroller.net/svnbrowser/transistortester/). The official firmware supports the measurement of inductance (somewhat limited) and ESR meanwhile. Documentation is available in English and German. My latest version of the alternative firmware will be also uploaded soon. New feature is the measurement of small resistors (resolution 0.01 Ohms). Of course it's not very accurate (2wire) but usable :-)You don't need to buy the cheap copy from eBay, build the original tester and get the latest firmware! Great project for MCU beginners!

author: LEECH666
author_rank: Frequent Contributor
timestamp: November 08, 2012, 01:45:06 pm
content: I want to make my own board for that tester. Just for the fun of it. I might even make a kit. But as usual it will take me a long time to get anything done. xDOh well let's see what becomes of it.Cool project tho.Cheers,Florian
OSHW Priority list - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: August 26, 2012, 12:54:39 pm
content: Woohoo a brand new OHSW section! Thanks Dave!And here is the first question to stir up the things a bit:What are the most urgently needed open source projects in your opinion? If we were to make a priority list, what should go on top?What open source thing would be most beneficial to humanity?This is an electronics forum but there is no reason we should limit ourselves to it imho.

author: firewalker
author_rank: Super Contributor
timestamp: August 26, 2012, 01:05:35 pm
content: Medicine formulas.Alexander.

author: Rerouter
author_rank: Super Contributor
timestamp: August 26, 2012, 01:27:00 pm
content: perhaps start with posting links to where you can find the OSHW logo for various cad packagesother than that, perhaps a dna analyser, and high channel eeg, both of those i believe are considerably expensive in the medical world, and slow down there progress a little,for the industrial world, a HART to usb communicator would help out a whole mess of technitions rather than forking out close to 1 grand per modem, possibly even adding in other standard signals and communication protocols, ....thats all i can think of off the top of my head, and these things may already have designs, and large parts of them do come down to software :/

author: Unknown
author_rank: Unknown
timestamp: August 27, 2012, 01:21:24 pm
content: Medical equipment and medicines were the first things I thought of too.My understanding is that medical research is one of the most profitable and therefore best financed fields of research ever. Also it is besieged with patent thicket. There is a way to do it however, if the community organizes a big champaign to raise money and then use this money to finance research with the condition that all findings would be open sourced.... In other words a scientific lab financed by the community in a kickstarter sort of fashion?
Very Mini AVR Processor Module with Expansion boards - Page 1
Forum section: electronics / general

author: tinycircuits
author_rank: Newbie
timestamp: September 26, 2012, 06:57:03 pm
content: Hi All,I'm in the process of starting up an open source hardware company in Akron, OH, from a project that I started as a member of SYN/HAK, the Akron, Ohio Hackerspace, and we just launched a Kickstarter campaign last week.The project involves shrinking the size of the Arduino, but without giving up the signals, processor power / memory, and expansion capabilities (via shields) of a standard Arduino. I realize a lot of you here don't really like the Arduino / Arduino software tools and just want a standard micro board that you can program - you certainly can also do that with this as well and you can easily program the ATmega328p processor directly using ICSP.There are obviously other tiny Arduino type boards out there (like the Digispark or the FetmoDuino), but our big focus is on creating tiny shields as well to make for an awesomely small project. We've past our initial goal and our now working on a number of stretch goals to create tiny shields for things like motor control, Bluetooth, Wifi, Ethernet, etc. We also are not just an "Arduino" type maker - will be coming out with processor modules for other vendors, including for TI MSP430s, Microchip PICs, ARMCortex-M, and more.Here's a brief overview of the project on Kickstarter:The TinyDuino is just 20mmx20mm (Smaller than a US Quarter)! with a coin cell battery holder option, but still has stackable shield support and all the Arduino shield signals available! And it uses the same Atmel microcontroller as used on the Arduino Uno.The TinyLily Mini is 14mm in diameter (Smaller than a US dime)! This board has large sewtabs for easy soldering to, and also uses the same ATmega328p as used on an Uno.http://www.kickstarter.com/projects/kenburns/tinyduino-the-tiny-arduino-compatible-platform-w-sSince you see all of the similar type projects out there, I'm extrememly interested on your thoughts of the project. Even if you don't run it on the site, I'd love if you could send me a quick message of your thoughts.Thanks!Ken @ TinyCircuits (http://Tiny-Circuits.com)
Idea for open source I2C 12 channel servo controller  - Page 1
Forum section: electronics / general

author: Torrentula
author_rank: Regular Contributor
timestamp: August 01, 2012, 06:11:55 pm
content: Hey guys!I am thinking about this for a few weeks now but I'm still not sure ifI should do it.I have designed a 12 channel I2C servo controller and I had some proto boards manufactured by iTead studio. Of course the design will need some more refining but the main functionality is there.Now I'm thinking about making the controller an open source hardware project and releasing the design files, schematic and code under the creative commons license (share-alike) and therefore make it open source hardware.To top things off I might even go to Seeedstudio and let them manufacture and distribute the board (as I have no big rep I certainly couldn't sell the boards.The things that are keeping me back are the question if there is even any need of yet another 12 channel I2C servo controller or if there is just too much well known and proven products out there.Do you think this is a good idea and that I should be attempting it?

author: SeanB
author_rank: Super Contributor
timestamp: August 01, 2012, 06:41:34 pm
content: Go for it, let the design be your advert. Nothing wrong with doing it, and it adds to the collective as well, and may prove useful to others as well, with a similar problem, who may also use it in their designs and attribute you.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 02, 2012, 11:42:47 am
content: Before hitting the manufacture button, are you aware that you can do a 16 channel controller with a single chip -http://www.nxp.com/products/automotive/display_instrumentation/led_controllers/PCA9685PW.html

author: Torrentula
author_rank: Regular Contributor
timestamp: August 02, 2012, 01:52:40 pm
content: Thanks Sean and Mike!I'm afraid the specialized chip wouldn't be cutting it, though it has more channels because I have been thinking about adding more features like saving the current positions and then automatically go to these positions on startup, might aswell add a feature so the user could send a scaled 0 to 180 degree angle to the controller and it takes care of the correct pulsewidths (make it a no-brainer for the Arduino lot / beginners)Keep em coming

author: EEVblog
author_rank: Unknown
timestamp: August 15, 2012, 12:49:48 am
content: Quote from: Torrentula on August 01, 2012, 06:11:55 pmYes, and yes!Just do it.You'll never have any idea how many other people will want it unless you put it out there.Dave.

author: MickM
author_rank: Regular Contributor
timestamp: August 25, 2012, 07:16:33 pm
content: Hi;I bought this:https://www.adafruit.com/products/815Still waiting for the servos to arrive.Mick M
P01-109 BLiVIT Rev M - crowdsourcable? - Page 1
Forum section: electronics / general

author: asgard
author_rank: Regular Contributor
timestamp: June 01, 2013, 12:10:19 am
content: I am very close to getting final prototypes on my feature-rich power supply system, the BLiVIT is the core. Single-cell lithium battery charger that accepts power from either USB or a wall-wart. The load can be powered during the charge cycle with automatic switchover. The load is completely isolated so the power is floating and not earth ground referenced. The POQiRX is a daughter-board for the BLiVIT which introduces a Qi compliant wireless power receiver into the BLiVIT charger. The entire assembly of BLiVIT, POQiRX, the Qi receiver coil, battery, and both thermal sensors (for the battery and the receiver coil) fit in a (I think it's cool) 42x64x22mm enclosure.There is a further 60x60mm board for the POQiTX transmitter, which is the complementary unit for the POQiRX. It is power sourced from either USB or wall-wart, and is fully Qi compliant with an A11 class transmitter.My question here results from the fact that this project is being accepted as a series by Elektor for (maybe) the July/Aug project issue, or later this Fall. Is the fact that all elements are OSHW and being published going to be an impediment to getting it crowd-funded so I can go into production with this? Should it be packaged as a cafeteria-style list of elements or should it be sealed configuration?I can get into specifics including Eagle files and photos, if desired, but I need to know if any of the usual crowd-funding channels are viable for something like this.J.R. Stoner/BDG
Pick & place ZB3545TP replacing Charmhigh CHM-T36VA - Page 1
Forum section: electronics / general

author: jrgandara
author_rank: Contributor
timestamp: October 14, 2025, 04:16:54 pm
content: I've had a Charmhigh CHM-36VA for a few years and have assembled over 100,000 small modules (40mm x 15mm) with it. I've never had any mechanical problems, it seems quite robust and is working well so far. My biggest complaint is the software, which I find neither practical nor user-friendly. After-sales support and instruction manuals are poor, and I've never been able to get a software update. A recurring problem is that plastic which comes over the component reels which have very strong glue and cause the machine to stop.I'm planning on buying a newer one with better features and keeping this Charmhigh as a backup. A friend has this ZengBang ZB3545TP and really likes it. But he is not a technical person and his employee which uses it. It has four nozzles and four cameras, which makes it faster. The software seems better to me, and it uses Yamaha feeds. I imagine it's much better, since professional pick and places use Yamaha feeders. Another advantage is that they have a representative here in Brazil, which I believe makes things easier.Does anyone here have any experience with this ZB3545TP? Is it worth it? Any suggestions are welcome.

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: October 14, 2025, 11:43:34 pm
content: I don't know about that machine, but you will LOVE going to actual feeders.Best sources I've found are HWGC or smtspot, both direct from China.Looks like that machine is very limited on feeder space, have you gotten the exact specs and looked over your BOM, making sure you have extra for future projects?

author: jrgandara
author_rank: Contributor
timestamp: October 15, 2025, 02:29:39 am
content: I only do small modules with never more than 20 components so I think 38 is plenty. Better feeders will be a huge improvement for me, so that's great! I will check those sources.Thank you for your feedback.

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: October 15, 2025, 05:04:59 am
content: I actually went to see the ZB3545TP in Shenzhen when it has yet to hit the market in 2019. Well built and I love their software which I still believe is the most intuitive among their peers. Despite the look, it is not small. But, if you start adding 12mm and 16mm, in no time you run out of feeder space. 3x8mm slots is needed for a single 12 or 16 mm feeder. I have written a blog post prior to buying my machine, read it so you know what you are getting into.
Good 2K/4K camera for manual PnP machine? - Page 1
Forum section: electronics / general

author: Tech Engineer GR
author_rank: Newbie
timestamp: October 15, 2025, 11:43:42 am
content: Hello, I have an eC-placer from Eurocircuits, and the provided camera is really bad. Since my eyes are starting to give on near-onbject focusing, I could really use a good camera right about now. I do a lot of small components like 0402 and fine pitch TSSOP. I don't mind spending good amount of money, as I do a lot of low volume but high value production on this machine. One requirement is that it works with Linux, as I have ditched Windows for almost 20 years now. I have tried a few web cams but they are not able to focus below 6-7cm from the board.

author: thm_w
author_rank: Super Contributor
timestamp: October 15, 2025, 08:49:36 pm
content: Do you want autofocus? Budget?https://www.eevblog.com/forum/manufacture/smd-rework-microscope/https://www.eevblog.com/forum/reviews/yet-another-microscope-thread-amscope-eakins/No idea if it works on linux you'll have to check:

author: SMTech
author_rank: Frequent Contributor
timestamp: October 16, 2025, 07:33:27 am
content: Or maybe something like this?https://www.aliexpress.com/item/1005005273108019.html?I imagine you want something as small as possible if its mounted near the nozzle.either way I think what you want will be found on somewhere like aliexpress with a search like USB inspection

author: Psi
author_rank: Super Contributor
timestamp: October 16, 2025, 09:25:03 am
content: Quote from: SMTech on October 16, 2025, 07:33:27 amOnly MJPEG through USB2 though, so framerate is pretty bad at 4k.Really want a USB3 one that can do 50 or 60 fps, or at least , i'd want thatDoes OP need USB, or can it just be HDMI to a screen?HDMI cameras tend to be better than USB cameras.
UK only SMT Bundle - Page 1
Forum section: electronics / general

author: SMTech
author_rank: Frequent Contributor
timestamp: October 14, 2025, 02:36:42 pm
content: It is not often you see a publicly listed price for new equipment but this outfit seems to do so now and then.https://x.com/elite7group/status/1975855230660280652for those that don't want to click thats £153K for Hanwha PnP with 64 electronic feeders, an ESE Printer and a 6 zone Folungwin reflow oven and a couple of conveyors to link them all up.All pretty capable bits of equipment with proven track records, I think the fact offers like this are possible puts a lot of perspective on any attempt to build something similar using those Alibaba machines. This would beat them on multiple fronts for specification, outlast them by a significant margin and still cost quite a bit less than several other options.

author: pan
author_rank: Contributor
timestamp: October 18, 2025 10:55:23 am
content: Since this offer is for UK and Ireland only, Scandinavian and Baltic countries can have a look at:https://cynergy-smt.comif you are interested in these brands.Cynergy is the distributor for Hanwha, ESE and more in Scandinavia and Baltic region. They don't have the same package deal listed, but I'm sure technical information, pricing etc are just one mail or call away.I bought my Hanwha SM482+, feeders, tray changer, t-olp, t-elite through James at Cynergy. I'm looking at the ESE US E2 screen printer to replace my Speedprint 210 some time in the future
LED controller board - Page 1
Forum section: electronics / general

author: Bongul
author_rank: Newbie
timestamp: October 12, 2025, 04:59:32 pm
content: Hi everyone, I have a pcb i'm designing for an LED control board that will control a pair of LED strips, similar to the Dig Quad board. The Dig Quad looks awesome but at almost $60 shipped, I might as well make my own and learn something in the process.My main concern is I'll be using relatively high current as the LED strips will need a fair bit of juice due to them being 60LED/m, and 2 of them, and nearly 4m in length each.The traces that will route power to the LEDs will be fused at 3A, with each strip likely being limited to 2A power using the software on the ESP32 i'll be integrating into the board.How wide should I be making the traces that will handle the power? I've seen answers stating anywhere between 2.5mm and 5mm.I've done lots of PCB design before but for low current stuff like guitar pedals and the like so trace width wasn't too much of a worry.I'd also like to get the PCB reviewed before I send it to manufacture to make sure I'm not missing anything - is this the right place for such a thing?

author: tooki
author_rank: Super Contributor
timestamp: October 12, 2025, 08:45:58 pm
content: There are plenty of PCB trace calculators out there, for examplehttps://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-pcb-trace-width. You will have to decide what temperature rise is acceptable to you. This is likely why you’re seeing such big differences: some people are OK with a 30°C temperature rise, others want just 1°C.At 10°C rise, on standard 1oz copper, an external trace only needs to be about 1.4mm wide, on internal layers, 3.6mm. If you do a 3mm width, you’ll have under 15°C rise on an internal layer, and under 3°C on an external layer.With that said, the wider the trace, the less voltage drop. So just make them as big as will fit, just no thinner than what you calculate.Remember also that voltage drop is a big issue with long LED strips (their copper is not very thick, either!!), so you will want to feed in the supply voltage from both ends at least, and ideally once or twice in the middle.
0402 will tombstone? - Page 1
Forum section: electronics / general

author: makebit
author_rank: Unknown
timestamp: October 11, 2025, 04:50:04 pm
content: Hi,Do you think the attached 0402 capcaitor will tombstone or go "head-on-pillow".The pads have such different amounts of copper

author: Bud
author_rank: Super Contributor
timestamp: October 11, 2025, 05:38:28 pm
content: Turn On the solder mask layer to see exposed copper.

author: makebit
author_rank: Unknown
timestamp: October 11, 2025, 11:29:33 pm
content: Thanks, as attached..

author: wraper
author_rank: Unknown
timestamp: October 11, 2025, 11:58:11 pm
content: Hard to say. Chances are pads are roughly equal at heatsinking. No thermal relief on the left, however overall more copper on the right.

author: Bud
author_rank: Super Contributor
timestamp: October 12, 2025, 01:04:42 am
content: It should be fine if reflow profile is followed.
Is this USB-C connector metal underneath? - Page 1
Forum section: electronics / general

author: makebit
author_rank: Unknown
timestamp: October 11, 2025, 02:46:02 pm
content: Hi,Is the underbody of this metal or plastic?...we are just wondering if we can route tracks underneath it.https://www.lcsc.com/product-detail/C165948.html?s_z=n_C165948https://www.lcsc.com/datasheet/C165948.pdf

author: MarkF
author_rank: Super Contributor
timestamp: October 11, 2025, 03:34:51 pm
content: Look at your own product link....What do you think?

author: makebit
author_rank: Unknown
timestamp: October 11, 2025, 04:52:31 pm
content: I wouldnt route tracks beneath it, but the customer says to do it because they have done it before and gotten away with it.

author: ataradov
author_rank: Super Contributor
timestamp: October 11, 2025, 06:19:26 pm
content: It is fine to route things underneath, it is done all the time. If your PCB quality is so bad that solder mask allows for shorts, you really need to address your PCB manufacturing.

author: ebastler
author_rank: Super Contributor
timestamp: «Reply #4 on:Todayat 11:33:00 am »
content: The "belly" of the jack will not touch the PCB surface anyway. The SMD pins in the back, and the little standoffs on the two solder tabs in the front, will define the height of the part above the PCB.
PCBway ***ery - Page 1
Forum section: electronics / general

author: SMTech
author_rank: Frequent Contributor
timestamp: October 10, 2025, 10:43:36 am
content: Has anyone got the skinny on exactly what PCBWay is up to? Since their shutdown, multiple options are unavailable, orders are delayed with engineering questions relating to specifications they or their subcontracted PCB houses ( this is from them) are currently unable to offer. These features include some thicknesses other than 1.6mm & uL approval.The explanations include some kind of restructuring, a new UI & partner capabilities. Oddly at no point are they blaming a backlog from being shut for a week.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 10, 2025, 12:52:12 pm
content: AIUI a significant issue with China is that after holidays, many staff don't return for various reasons - often they have had better job offers elsewhere, or want to stay with their families they've been visiting.So they are probably just short of staff.

author: passedpawn
author_rank: Contributor
timestamp: October 10, 2025, 10:05:56 pm
content: Something funny going on at PCBWay. Payment and shipping pages changed. DHL not available, only FedEx, and I was being asked for social security number. Instead I just ordered from JLCPCB. First time using that one.

author: themadhippy
author_rank: Super Contributor
timestamp: October 10, 2025, 10:17:46 pm
content: QuoteAll down to the land of the free's government and nothing to do with the commies trying to steal your identityhttps://www.help.cbp.gov/s/article/Article-1118?language=en_US

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: October 11, 2025, 12:27:22 am
content: Quote from: passedpawn on October 10, 2025, 10:05:56 pmAs said it is due to imports. You need to supply either a SSN or an EIN number. Just apply for an EIN to keep your SSN number private.
Common or best strategy for straight pin connectors on PCB?   - Page 1
Forum section: electronics / general

author: viper
author_rank: Regular Contributor
timestamp: October 08, 2025, 08:09:16 pm
content: Have several to be added. I'm not sure if a single header or separates are more preferred or even matter? I have probably 3-4 connections that are 2-3 wire, analog, power, etc. I do have one that carries I2S audio, which I'm a touch worried about getting that right, but wondering if there are common, more or less industry standard headers/plugs to be using that all PCB houses would be using?I'm probably not that concerned with polarized plugs as these would only be assembled in house, and are not field serviceable.

author: thm_w
author_rank: Super Contributor
timestamp: October 08, 2025, 09:20:59 pm
content: JST XH, XA, any generic polarized IDC shrouded header.Assembly in house doesn't mean someone will never screw up and plug it in backwards or in the wrong location.

author: Ian.M
author_rank: Super Contributor
timestamp: October 08, 2025, 09:59:47 pm
content: Don't use two identical connectors unless they are functionally interchangeable in the circuit! Its better to waste a few pins (extra grounds are always good) to avoid the risk of a tech having a brain-fart and plugging power into a low level signal input/output . . .
LCSC to the UK: experiences? - Page 1
Forum section: electronics / general

author: tom66
author_rank: Super Contributor
timestamp: October 06, 2025, 04:21:14 pm
content: I'm looking to order some items from LCSC to the UK but it appears unlike AliExpress or other sellers, they don't collect VAT in advance. Has anyone been stung by a large bill when having an LCSC order arrive?

author: jc101
author_rank: Frequent Contributor
timestamp: October 06, 2025, 05:45:55 pm
content: I've ordered a few things from LCSC, but as a company. I think they have my VAT number of file.The stuff just turned up, then I get a VAT certificate later organised by the courier for postponed VAT - which basically means I put it on the VAT return and claim it back - so no VAT is actually paid.Edited to correct this, as I've gone and checked the paperwork.The goods arrive, then at some point later I get an invoice from UPS for the VAT (my chosen courier, as I have an account with them). This generates a VAT C79 certificate, to record the VAT has been processed. So I pay UPS the VAT, and them claim it back on my VAT return - I just input the invoice from UPS, which is virtually all VAT.It's all pretty seamless. I've had no issues with any of the parts received.

author: tom66
author_rank: Super Contributor
timestamp: October 06, 2025, 08:29:50 pm
content: Does UPS charge a fee for that? I've been stung before with this kind of thing and had to pay £20 to the Royal Mail to pay the 50p VAT on my behalf.

author: jc101
author_rank: Frequent Contributor
timestamp: October 06, 2025, 08:37:07 pm
content: They do, it’s around £15 from memory. It was a small fee given the overall size of the order.

author: tom66
author_rank: Super Contributor
timestamp: October 06, 2025, 08:49:10 pm
content: Thanks. In my case, it's the opposite - so probably just worth putting together a larger Digi-Key order then as they do DDP.

author: jayx
author_rank: Regular Contributor
timestamp: October 07, 2025, 07:20:05 pm
content: I've done a small order (for $21) from LCSC about a month ago and didn't have to pay VAT. I've selected free shipping (which took over a week), not a courier.
PCBWAY USA orders  - Page 1
Forum section: electronics / general

author: dnparadice
author_rank: Contributor
timestamp: October 03, 2025, 06:20:25 pm
content: Any one using PCBWAY in the US for orders in September 2025? I'm wondering if they have the shipping and tariffs worked out. My last order was in July and it took 32 days to get a 7 day turn and I'm still getting texts from DHL about tariff charges. Ended up going with a US board shop for Aug and Sept but I'm ready to go back to PCBWAY.

author: ataradov
author_rank: Super Contributor
timestamp: October 03, 2025, 07:48:03 pm
content: Pick DDP delivery at checkout and it will include all the tariffs in the cost at checkout. It will be more expensive option upfront, obviously.This was always an option even before the tariffs,

author: dnparadice
author_rank: Contributor
timestamp: October 03, 2025, 10:39:06 pm
content: Thanks @ataradov I will try that. I have never had a bad experience until the last order, I think DHL just gave up.

author: jmelson
author_rank: Super Contributor
timestamp: October 07, 2025, 02:53:37 pm
content: I just recently got an order from them, we did get hit with a HEAVY tariff charge from DHL for a batch of 20 panels. It is hard to calculate the tariff amount, but the cost of the boards on PCBway was 343.70 (not including shipping) and the DHL charge was $199.78. There are all sorts of charges in there, handling fees, etc. but it works out to about 58% or so.Jon

author: ataradov
author_rank: Super Contributor
timestamp: October 07, 2025, 03:00:55 pm
content: The standard tariff to the US right now is 55% on bare PCBs, so 58% seems not too far off, assuming that's the only place it was charged.
Do you know how SD card reader solders to board? - Page 1
Forum section: electronics / general

author: makebit
author_rank: Unknown
timestamp: September 29, 2025, 12:23:42 pm
content: Hi,Do you know how this SD card reader may be soldered to the PCB?https://www.molex.com/en-us/products/part-detail-pdf/473521001?display=pdfWe have a PCB layout from our contractors which shows two 0402 resistors underneath the part on the PCB (as attached) , on the same layer....surely these would snag it?Also, should one of the "pads" be connected to local ground on the PCB?...Surely the metal of it should never be allowed to float?

author: Jackster
author_rank: Frequent Contributor
timestamp: September 29, 2025, 12:29:20 pm
content: This is a SMT part that is designed to be placed on top of solder that was applied via a mask.You can do it but hand but you need to apply solder paste to the board, place the part on top and then reflow using hot air. OP was edited with further information that was not included when I posted this reply.

author: mtwieg
author_rank: Frequent Contributor
timestamp: September 29, 2025, 12:44:28 pm
content: Obviously the contractor screwed up, and should be embarrassed by this.In theory maybe it's possible for resistors to fit there without interfering with the card or holder. Would have to inspect a 3D model to tell. But even so it's absolutely stupid to actually put the resistors there.

author: makebit
author_rank: Unknown
timestamp: September 29, 2025, 12:50:31 pm
content: Thanks, also, even though the tracking beneath the part has a thin covering of solder resist, surely none of the shown tracking (attached) should be here?Surely there should be no copper beneath the part other than ground?, and the metal case itself should surely be connected to ground?Surely any tracking coming to the pads must come up through a via_in_pad of diameter <0.3mm ?

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 29, 2025, 01:11:09 pm
content: Weird spots1) resistor placement2) mysterious keepout around the slot's GND pad3) +3.3V trace cuts the GND plane.4) via in padconnecting the slot frame to GND is optional. I prefer to connect it.also, let's stop using components that require reflow soldering, which makes manual assembly impossible.There are plenty of other components available.

author: gamalot
author_rank: Super Contributor
timestamp: September 29, 2025, 02:56:38 pm
content: Quote from: makebit on September 29, 2025, 12:50:31 pmThe SD card connector in your design has a plastic base, so routing traces underneath it is not an issue. I checked the 3D model of the connector, and those two 0402 resistors shouldn't be placed there.
JLCPCB closed due to Typhoon (Sep 2025) - Page 1
Forum section: electronics / general

author: Smokey
author_rank: Super Contributor
timestamp: September 24, 2025, 08:28:34 am
content: If you've been wondering why nothing is getting worked on at the moment, it sounds like they are closed down due to a typhoon.https://jlcpcb.com/blog/orders-delays-due-to-typhoon-impactConfirmed with "online chat guy".

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 26, 2025, 09:53:07 am
content: I'm seeing a big delay on an order,seems to just being held up by the stencil though

author: mtwieg
author_rank: Frequent Contributor
timestamp: September 26, 2025, 04:50:45 pm
content: I happened to place a PCB order on Wednesday, and just got a shipping notification today. This was just for PCB fab, no assembly or stencils.

author: Uunoctium
author_rank: Frequent Contributor
timestamp: September 26, 2025, 05:18:00 pm
content: Only for record. A new subtitle on order history: "JLCPCB factories will be closed on Oct. 1–3 and Oct. 6 for holidays."(Mine three jobs are finished, last shipped today - no delay)

author: Smokey
author_rank: Super Contributor
timestamp: September 27, 2025, 01:30:52 am
content: They got around to working on my projects again last night. So I guess they are back.
Vision Engineering Lynx Microscope alignment (moved - can be deleted) - Page 1
Forum section: electronics / general

author: FlexibleMammoth
author_rank: Regular Contributor
timestamp: September 20, 2025, 01:29:18 pm
content: --> Moved to test equipment here:https://www.eevblog.com/forum/testgear/vision-engineering-lynx-microscope-alignment/msg6045641/#msg6045641

author: thm_w
author_rank: Super Contributor
timestamp: September 22, 2025, 08:32:24 pm
content: It shouldn't be in the test equipment section, its not test equipment. imo.Should be in here or Other Equipment.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 23, 2025, 08:34:31 am
content: Looks like it was not moved, but duplicated (which is not allowed on EEVblog).Don't worry, no harm done and no other changes needed with this topic, but just so you know for the next time, it is possible to move one's own topics from one place to another. Click on the first post, and there should be a move button at the very bottom of the webpage, with a drop down menu to select where to move it.

author: FlexibleMammoth
author_rank: Regular Contributor
timestamp: September 25, 2025, 06:13:20 pm
content: Oooooh okay. I looked at the entire page because I was sure it must be possible somehow but did not find it. Thanks!
TVM802B Software installation - Page 1
Forum section: electronics / general

author: Zikko
author_rank: Newbie
timestamp: September 17, 2025, 09:16:13 am
content: I have a bought a used TVM802B. I have the newest software for it. (V3.44) But unfortunately the seller did not want to sell the Laptop with it. Now I'm trying to setup the software from scratch. But so no luck. I tried Windows 10 Pro, Windows 10 home Premium and Windows 10 32bit. But on none of the machines did the software start. You click on "SurfaceMount.exe", but nothing ever happend. I saw the software running on Windows 10 as I collected the machine. What means running it on this OS should be possible.These are fresh windows installs. Windows automatically installed dotNet Framework 3.5. Is there anything else I need to install before the software starts?I tried the Windows XP compatibility mode, but still nothing. I asked the seller and he had no Idea what he did to it running. He said it "just worked".

author: thm_w
author_rank: Super Contributor
timestamp: September 17, 2025, 09:21:45 pm
content: Discussed here:https://www.eevblog.com/forum/manufacture/pick-and-place-machine-tvm802a-tvm802b/https://www.qhsmt.com/2022/04/12/tvm802a-support-tvm802b-smt-pick-and-place-machine-software-firmware-update-log/

author: meshtron
author_rank: Regular Contributor
timestamp: September 20, 2025, 03:55:19 pm
content: Huh, where did you get 3.44? I am running 3.38 amd thought that was the latest.

author: Zikko
author_rank: Newbie
timestamp: September 24, 2025, 10:15:34 am
content: Quote from: meshtron on September 20, 2025, 03:55:19 pmWrote to the support e-mail. They send me an zip in the mail. I was a bit surprised, too. Their website lists 3.38 as latest version.Quote from: thm_w on September 17, 2025, 09:21:45 pmThats a 43 page thread with a lot of different information in it. I skimmed over it, but did not find anything useful. If you know if and where the installation info is in the thread, please help by linking the post, not the whole thread.

author: Zikko
author_rank: Newbie
timestamp: September 24, 2025, 02:30:49 pm
content: Found it. Software is working now:You need:Microsoft visual c++ 2010 redistributable package (32bit).NET Framework 3.5 in 32bit - This should be installed automatically on Windows 10 if connected the internet.The camera driver may or may not install automatically. On Windows 10 32bit I was able to install the Windows XP driver provided with the software. Windows 10 64bit also works if all 32bit packages are present, but I was not able to install the camera driver from the manufacturer.
PCB MATERIAL CHOOSING FOR HIGH POWER - Page 1
Forum section: electronics / general

author: HDS@embedded
author_rank: Newbie
timestamp: September 16, 2025, 07:11:54 am
content: DEAR FOLKS,I need suggestion for design a 2 pcb for high power,one pcb for 100v dc 600a for switching the batter power i using nchannel mosfetanother pcb using for buck conversion circuit ,here around 25 amps 100v dc

author: Jacques
author_rank: Contributor
timestamp: September 18, 2025, 07:09:32 pm
content: Quote from: HDS@embedded on September 16, 2025, 07:11:54 amWhat did you already think of? It's hard to gauge your level of design expertise and experience from the opening post.This sort of current density, i.e., hundreds of amps, is substantial but can be managed using a well-designed PCB.Here's one suggestion to get you started -- PCBs with super thick copper layers, e.g. 8 oz or even more, tend to be very expensive to fabricate. Instead, simply bolt aluminium or copper busbars directly onto the PCB and connect (e.g., weld or bolt) your current-carrying wires to those instead of the PCB itself.For example (not my design):
Sending US parts to PCBWAY / JLCPCB + manual soldering of a small module - Page 1
Forum section: electronics / general

author: microvia
author_rank: Regular Contributor
timestamp: September 13, 2025, 08:07:11 am
content: Hi,I would like to compare the price between PCBWAY (who raises the parts prices) and JLCPCB.I have two questions:- Mouser has enough stock for one part (unlike LCSC). What's your safest way to ship parts to avoid customs / delivery troubles ? Mouser's DHL rate with prepaid customs fees ?- My PCBs use a small module with castellated holes, which looks like this one:https://www.aliexpress.us/item/3256808830546269.html, but with QFN devices. It must be hand soldered to avoid furnace / reflow soldering, which has damaged several (8% or so), probably because of the fragile QFN solders. PCBWAY can hand-solder them. What aboud JLCPCB ? What's your experience with this kind of specific assembly ?Thanks.

author: xvr
author_rank: Frequent Contributor
timestamp: September 14, 2025, 09:03:50 pm
content: QuoteThe best way to do this is to use the "Global Sourcing Parts" feature in JLPCB Parts Manager. They will source the parts you need directly from Mouser (or any other distributor you choose).QuoteYes, they can. But I don't know the details - I've never used this opportunity. You'd better contact JLCPCB directly, they respond quickly.
TVM802 (electrostatic ?) jump when nozzle approach - Page 1
Forum section: electronics / general

author: Hubert_Vaudoo
author_rank: Newbie
timestamp: September 08, 2025, 12:30:57 pm
content: Hello,I've got a problem with my TVM802 :When the nozzle approach some stack, the component jump out of the reel. Seems to be kind of electrostatic problem.It happened only with my 0603 resistor. 0603 capacitor and other bigger component are ok.I've tried to :- change the nozzle- buy a ioniser for cleaning the airBut there's still the problem.Does anybody had (and resolve) this problem ?Or have other idea to try?

author: meshtron
author_rank: Regular Contributor
timestamp: September 08, 2025, 10:32:45 pm
content: Is the power outlet it's plugged into grounded?

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: September 13, 2025, 05:49:46 pm
content: Yeah, with grounded equipment (check your grounding), I'd be surprised how that could happen. I don't live in a dry climate though, and I have to actively run a dehumidifier 24/7 to keep humidity down to safe levels for components.
How to learn about high volume manufacturing - Page 1
Forum section: electronics / general

author: Kasper
author_rank: Frequent Contributor
timestamp: September 13, 2025, 06:13:58 am
content: I'd like to learn about high volume manufacturing, to prep for an interview with a company making a UPS (uninteruptible power supply).I've ordered and tested plenty of PCBAs and enclosures but at most it was 1000 pcs. Usually less than 50. Mainly simple wireless sensors but also some complex avionics systems. I watched Dave's video about manufacturing years ago and followed it to put some power traces in panel rails for testing. I've also built bed of nails to breakout a tiny wearable.Not sure what the pros do for larger quantities. If you have tips and tricks to share or can point me towards a good knowledge source, I'd appreciate it.
Help Identifying BA5Z SR4, BA5ZSR5 and D05Z S.P4 Transistors for PCB Repair - Page 1
Forum section: electronics / general

author: LOYAL WINGMAN TECHNOLOGIE
author_rank: Newbie
timestamp: September 09, 2025, 04:35:39 am
content: Hello,While repairing a PCB, I found that three transistors labeledBA5Z SR4, BA5Z SR5 and D05Z S.P4are faulty. I have searched Google but couldn't find exact datasheets or part details for these codes. Could anyone help me identify what these transistors are, or suggest possible equivalents? If direct replacements aren't available, I’d appreciate recommendations for suitable substitutes.
Cheap IMX362 USB camera - Page 1
Forum section: electronics / general

author: jayk
author_rank: Regular Contributor
timestamp: September 04, 2025, 08:35:10 pm
content: I've been evaluating some webcams lately and here are pics of one. The sensor is a Sony IMX362. Cost me $35 (shipped) from ebay and came pretty fast through the mail from China - shipped Aug 22 and arrived Sep 3. Not sure what if any tariffs were collected.I've attached some pics of the board and sensor. Based on the photos and the datasheet the sensor appears to be genuine. Hard to tell for sure, but it looks like there's an IR filter glued on top of the sensor (maybe you can order it that way from Sony).I've only tested it with the Windows 11 Camera app so far, but it seems to work well. Runs at max resolution @ 30Hz even over USB 2.0.All of the semiconductors on the board are Chinese brands (except the sensor). The ISP (image signal processor) is a FIC7608 from a company called Image+. Their website doesn't even have an option to switch to English (fortunately Chrome translate works well). No idea about pricing for this but maybe a few dollars? The three SOT23-5 packages are RY3420 2A buck converters. They're like $0.06 each at JLC. There's a 4Mbit flash that's $0.07. It's all amazingly cheap. Don't know how these Chinese chip companies make any money. Also came with a USB cable and a wide-angle lens.

author: thm_w
author_rank: Super Contributor
timestamp: September 04, 2025, 10:07:39 pm
content: Some similar ones on aliexpress:https://www.aliexpress.com/item/1005007659147026.htmlLooks like it cant do 60fps though?What is your intended use case

author: TinLethax
author_rank: Regular Contributor
timestamp: September 05, 2025, 12:06:05 am
content: Yet another Camera controller IC with 8051. But this one claimed to be running at 120MHz. Nice to see that it has MIPI-CSI2 (as I'm currently looking for a single chip solution beside ESP32-P4). Doubt that I would be able to program it manually

author: jayk
author_rank: Regular Contributor
timestamp: September 05, 2025, 04:34:33 am
content: Micros with integrated MIPI is something I've paid no attention to at all. Most of the cheapo cameras I've been looking at have a fairly custom SOC/ASIC and I wouldn't expect much software support for the end-user.What's wrong with that ESP32 you mentioned? A quick search also turned up the SAMA7G5, which looks pretty impressive (some variants come co-packaged with up to 512MB of DDR3).

author: TinLethax
author_rank: Regular Contributor
timestamp: September 05, 2025, 06:55:39 am
content: The ESP32-P4 is fine actually. But if can I choose between QFN ~40 pins vs 104 pins. I would go with the lower pin count. But ESP32-P4 definitely has way more support and documents compare to that unheard brand.
High current pcb material selection  - Page 1
Forum section: electronics / general

author: Chandra Sekar
author_rank: Newbie
timestamp: October 07, 2025, 01:15:03 pm
content: Dear friendsI am design a power distribution board of 80v 800amps dc .I need support for choosing pcb type, material thickness and copper busbar is needed...I estimated 10oz 3mm track width.. please suggest about this

author: Doctorandus_P
author_rank: Super Contributor
timestamp: October 07, 2025, 04:41:51 pm
content: 1 oz is around 35um, so 10 oz would be 350um and with a width of 3mm that is one square mm of cross section, which is enough for 10A or so. You're off by nearly two orders of magnitude, so you have some serious reconsiderations to do.For 800A you need such thick bus bars that it would become silly to glue some PCB material to it.For an idea what high current applications look like, you can do a search for electric motor controllers for cars, but you'd also have to consider differences between short current peaks (which just heat up mass) to long duration current (the heat will have to be removed to prevent overheating).

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: October 07, 2025, 09:15:18 pm
content: 800 amps? Is that correct? If so, a PCB just isn't the right tool for the job.I'm calculating at 10oz copper, you need an 300mm wide trace.
PCBWAY - Page 1
Forum section: electronics / general

author: gregfox151@gmail.com
author_rank: Contributor
timestamp: August 25, 2025, 07:07:29 pm
content: I’ve ordered from JLCPCB for years and they’ve consistently delivered: fast, affordable, and reliable. Out of curiosity, I tried PCBWAY. That experiment lasted exactly one order.The results? JLCPCB had my boards in my hands a full week before PCBWAY even showed up. Price comparison: JLCPCB, $12. PCBWAY, $47 — plus an invented 147% “tariff” and inflated shipping charges for good measure. Paying four times more for slower delivery isn’t “premium service,” it’s highway robbery dressed up as customer care.PCBWAY turned a simple PCB order into an overpriced waiting game. Lesson learned: I’ll stick with JLCPCB, a company that understands the meaning of value, efficiency, and respect for their customers.

author: thm_w
author_rank: Super Contributor
timestamp: August 25, 2025, 11:30:42 pm
content: At one point the tariff was ~120% (april-may) so if that was when you ordered, and the shipping was DDP, its a fair charge and you just chose the wrong time to order.Current US/CN tariff is30%.

author: wemme
author_rank: Regular Contributor
timestamp: August 27, 2025, 03:38:15 am
content: Tariffs aside. I used to use PCBway but the cost and issues with quality (broken stencils, average etching, thin plating and poor solder mask alignment etc).I ended up moving to JLCPCB and have not had any issues since and have run many jobs through them including SMT assembly as well with out any issues to date.There is room for improvement on their site particularly "component manager" part.

author: gregfox151@gmail.com
author_rank: Contributor
timestamp: August 29, 2025, 06:23:23 pm
content: Nope, it was last week.

author: gregfox151@gmail.com
author_rank: Contributor
timestamp: August 29, 2025, 06:24:17 pm
content: I will only use JCLPCB in future.