hybridfree/eevblog-posts huggingface dataset:
Soldering and inspecting iBGA 64 Aptina image sensor - Page 1
Forum section: electronics / general

author: suspension
author_rank: Regular Contributor
timestamp: April 27, 2022, 01:26:12 pm
content: Hi all,I have an Aptina MT9M021 image sensor which uses 64-Ball iBGA package. I've got my 4 layer PCB done already and ready to solder!I am quite new to SMT soldering and low on tools. Specifically, these are the tools that I have currently:1. Digital microscope for circuit inspection2. Home built reflow oven which can accurately follow any given profile3. Oscillascope/Multimeter/Low frequency logic analyzer/multi meter etcI have plenty of PCB's due to MOQ needs of my PCB supplier.I am thinking of getting a cheaper chip with the same package and try soldering that to one of the PCB's to practice. Still main issue I am facing is how to test if the chip soldered correctly? Can I use some sort of boundary scan to do this? Which other methods are available?Secondly, when I am ready to solder the image sensor, can I just follow the same process?That is, getting the recommended reflow profile from Aptina and use it with my reflow oven? This being an image sensor do I have to worry about any thing else?Also, do these chips come with solder in their BGA pins or do I have to put solder paste on the PCB? Ca I use boundary scan to test soldering of the image sensor?Thank youS
Looking into a semi-automatic stencil printer - Page 1
Forum section: electronics / general

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: April 20, 2022, 07:18:19 pm
content: Getting sick of my manual machine.I don't want to spend a ton of money, since when we build the new shop in a year or two, I'll be completely upgrading the assembly line and the printer will be automatic and integrated into the conveyor system.Recommendations?

author: Reckless
author_rank: Frequent Contributor
timestamp: April 20, 2022, 10:26:54 pm
content: I have a MPM SP200 for sale if interested. Personally I'm a big MPM fan for Semi Automatics.Looks like this:

author: Mangozac
author_rank: Frequent Contributor
timestamp: April 20, 2022, 11:07:45 pm
content: Quote from: Reckless on April 20, 2022, 10:26:54 pmWe run an MPM UP2000 fully automatic printer, so I certainly wouldn't dissuade OP from used MPM equipment. Depends on the price though - that SP200 still looks to be a somewhat complex machine and certainly isn't small. If it were me I'd make the jump to a proper automatic machine.

author: Reckless
author_rank: Frequent Contributor
timestamp: April 20, 2022, 11:25:54 pm
content: Its the same guts of a UP2000 thats why I recommend it. Diehard and bulletproof design. Last 20+ years with no headaches. That's why I'm a MPM fan. Fully automatics are a lot more.

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: April 20, 2022, 11:27:34 pm
content: Quote from: Reckless on April 20, 2022, 10:26:54 pmLittle bigger footprint than I'm hoping for honestly.

author: Reckless
author_rank: Frequent Contributor
timestamp: April 21, 2022, 09:35:39 am
content: They dont get much smaller than this for semi automatics.

author: Mangozac
author_rank: Frequent Contributor
timestamp: April 22, 2022, 12:51:22 am
content: The next size down is this then:http://en.kayosmt.com/index.php/Show/index/cid/345/id/320.html

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: April 22, 2022, 03:04:42 am
content: I didn't notice they have so many stencil printer ranging from the ones that other P&P manufacturer has but also a bunch of automatic ones. Do they build the automatic ones by themselves? As far as I know the manual and semi ones are OEM but the automatic models looks promising.

author: Reckless
author_rank: Frequent Contributor
timestamp: April 22, 2022, 08:34:25 pm
content: Quote from: Mangozac on April 22, 2022, 12:51:22 amTechnically that machine is alot bigger. The photo I posted made it look big but its not that big. Its actually quite small 30x40." For $2000 its worth it. Just the duty from China is probably that much. I really wish China made decent ovens and screen printers but they are notorious for not making things that work/last. MPM will last 20+ years, under $100/year. We kept it as a backup MPM but have too many screen printers with this electronic component shortage.
Manufacturer with expertise in HDI, CSP etc - Page 1
Forum section: electronics / general

author: AndyC_772
author_rank: Super Contributor
timestamp: April 27, 2022, 10:16:41 am
content: Hi all,I'm looking for a contract manufacturer able to confidently and reliably assemble boards with chip scale semiconductors, HDI boards, 0201 passives and similar components.Preferably located in the UK. I know about STI in Hook, but any other suggestions would be welcome.ThanksAndy.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 27, 2022, 10:47:40 am
content: https://www.tioga.co.uk/in Derby - no direct experience but they have been around quite a long time.

author: nali
author_rank: Frequent Contributor
timestamp: April 27, 2022, 12:56:22 pm
content: ASK in Basingstoke? Not used them myself, just know they are therehttps://www.asktechnology.co.uk
CL feeders for sale-  near new- Australia  - Page 1
Forum section: electronics / general

author: glenenglish
author_rank: Frequent Contributor
timestamp: April 12, 2022, 04:17:10 am
content: For sale now that I have a Samsung and are happy with it :these have all done very little work.84 of 8x250 of 8x41 x 8x118 of 12mm6 of 16mm4 x 24mm2 x trolleys each 80 feedersValue : ~USD9000 inc freight AUD ~13kSell : AUD$6600 inc GST.

author: Mangozac
author_rank: Frequent Contributor
timestamp: April 12, 2022, 08:47:17 am
content: If you're interested in splitting I'd take the 8x4 and up feeders. We only go down to 0603 so the 8x2 are no use to me.What did you do with your Kayo machines if you're not using the feeders?

author: glenenglish
author_rank: Frequent Contributor
timestamp: April 12, 2022, 09:31:55 am
content: Hisplit. Maybe.Sold the Kayo machines. Bought an SM482+.

author: georpo
author_rank: Contributor
timestamp: April 12, 2022, 11:28:43 am
content: hello, If you decide to split them I would be interested for some 8x2 feeders. I guess between 10-20pcs

author: Mangozac
author_rank: Frequent Contributor
timestamp: April 13, 2022, 07:29:47 am
content: Quote from: glenenglish on April 12, 2022, 09:31:55 amOK, keep us posted. I'm surprised the purchaser of the Kayo machines didn't take the feeders too - I'm guessing they already had heaps of their own?

author: Kean
author_rank: Unknown
timestamp: April 13, 2022, 09:11:49 am
content: I can't afford the lot right now, and I already have plenty of 8x2.If you do split... I need some 8x4 and 12mm feeders, and I might be interested in a trolley.Where in Australia are you? (edit: found your website, so worked it out)Edit 2: And I just realized who you sold the Kayo machines to.I just visited him while I was in Melbourne a week ago and ended up on his YT stream.

author: Mangozac
author_rank: Frequent Contributor
timestamp: April 13, 2022, 10:54:03 pm
content: Quote from: Kean on April 13, 2022, 09:11:49 amIt would suit me to go halves with you on the 8x4 and 12mm feeders.

author: glenenglish
author_rank: Frequent Contributor
timestamp: April 14, 2022, 01:52:28 am
content: Hi everyone, sold the lot pending payment.thanks for the interestam in Canberra.Gave away all my (old) genuine Yamaha feeders with the Kayos
Aluminium with nickel plating for electrical contacts? - Page 1
Forum section: electronics / general

author: SamVanPierro
author_rank: Newbie
timestamp: April 21, 2022, 09:50:01 am
content: Aluminium has higher ampacity than copper for the same weight of metal. Is it possible to have nickel plated aluminium electrical contacts, i.e. pure Alu with 30-50 microns of Nickel? Can you give industrial examples?

author: David Hess
author_rank: Super Contributor
timestamp: April 21, 2022, 03:38:35 pm
content: I have seen it on old style can capacitors for the solderable tabs, but I do not know how it is done.
Looking for a tilt board, prefer COTS - Page 1
Forum section: electronics / general

author: jpsmithcons
author_rank: Newbie
timestamp: April 10, 2022, 05:45:37 pm
content: Hi - first time caller, long time listener.I need a board/device, to power a ring of about a dozen or so LEDs, that will light in the direction it's tilted.So if I tilt the board forward, the 12 o-clock LED will light (and optionally the 11:00 and 1:00 LEDs will be dimly lit).Think of it like a hat for a radio controlled hoverboard, that lights the direction in which it's tipping.I've found the LSM303 Arduino board, but I hope I don't need to build this from scratch. Seems to me there should be something like this I can buy off the shelf, or one that's prebuilt but needs some tweaking. Worst case I might need to tweak/add functionality (e.g. a kill switch if it goes into a spin, or at startup, light the north-facing LED...) so maybe COTS and a little programming or Fiverr or something.Any guidance is appreciated!

author: themadhippy
author_rank: Super Contributor
timestamp: April 10, 2022, 10:17:24 pm
content: Maybe a microbithttps://microbit.org/25 leds and a built in magnetometer and accelerometer.

author: Ian.M
author_rank: Super Contributor
timestamp: April 10, 2022, 10:45:29 pm
content: Yep. Add a 'Neopixel' ring and combine these two tutorials:https://learn.adafruit.com/micro-bit-lesson-3-neopixels-with-micro-bithttps://learn.adafruit.com/micro-bit-lesson-1-using-the-built-in-sensors/accelerometer
Removing a section of a Cat cable jacket - Page 1
Forum section: electronics / general

author: jt
author_rank: Regular Contributor
timestamp: April 03, 2022, 06:10:28 pm
content: I want to use shielded Cat 5e cable for a multi-drop network (not Ethernet). One approach I'm considering would be to tap-off the main cable route using a small pcb with IDC contacts. This would require removing an intermediate section of the Cat cable jacket rather than just stripping off the end of the cable for standard connector termination. Is there a tool (preferably semi-automated) designed to do this? I understand it can be done with hand tools and multiple cuts/operations, but the application requires making such harnesses in a quantity that would benefit from minimizing touch labor.The harness assembly could alternatively be made using multiple lengths of Cat cable with more standard termination on the tap-off junctions, but I'd prefer to minimize connector losses and failure points that could add up to become non-trivial on a larger/more complicated harness assembly.

author: thm_w
author_rank: Super Contributor
timestamp: April 04, 2022, 10:59:31 pm
content: Related thread:https://www.eevblog.com/forum/projects/is-cat5-ok-for-can-bus/What sort of quantities, if we are talking 100s+, then wouldn't you be sending it off to a cable supplier and they can deal with how to cut the shield?What does the PCB get you, instead of just using this:https://www.patchcordsonline.com/cat5e-shielded-keystone-jackI guess termination resistor on the PCB?I would somewhat disagree that having standard termination ends and a T-tap PCB means more failure points. At least with standard crimps and connections you can buy off the shelf cables, and know that it was done correctly. With the IDC tap, you are relying on custom assembly. Although, you can request them to hi-pot and continuity test it for you (or make your own jig).

author: jt
author_rank: Regular Contributor
timestamp: April 06, 2022, 02:05:26 am
content: All good points. Thanks for the reply.
JLCPCB "Global Sourcing" for SMT assembly - Page 1
Forum section: electronics / general

author: thinkfat
author_rank: Unknown
timestamp: April 04, 2022, 07:58:11 am
content: Hi,https://support.jlcpcb.com/article/192-how-to-use-jlcpcb-global-sourcing-parts-serviceSeems like we can now also order parts from selected distributors for the SMT assembly service.That's interesting news. I used to order partially assembled boards and then solder the missing components myself, apparently the "Global Sourcing" will allow me to add parts that are not in the JLCPCB library or LCSC catalog. I haven't tried this yet, but likely I will for future designs.
PCB Partner new customer offer. - Page 1
Forum section: electronics / general

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: March 28, 2022, 09:08:18 pm
content: PCB Partner are offering free pcb's on first order.And postage is $1.50 for first order.Great stuff, so got my order in.Its an amplifier PCB with plated and none plated holes.Some holes need to be none plated as its underneath a metal heatsink.Arrival seemed a bit bit slow but it was cheap.Got pcb's and no none plated holes despite supplying 2 drill files, one marked clearly as none plated through holes.So got to drill out 8 holes on each pcb.They sent an email to see if I was happy with them and I pointed out problem with none plated holes.Apparently its my fault for not making solder resist over sized around none plated holes !So its back to JLCPCB now as they are much more reliable and dont blame me if there is a problem.I also compared prices and JLCPCB were about half the price for pcb.

author: Mangozac
author_rank: Frequent Contributor
timestamp: March 28, 2022, 09:35:23 pm
content: Nobody can even come close to JLC's pricing. I regularly have Chinese PCB manufacturers phone me to ask me to try their services but when I tell them we use JLC they give up and say thanks for my time.

author: nigelwright7557
author_rank: Frequent Contributor
timestamp: March 28, 2022, 09:54:51 pm
content: Quote from: Mangozac on March 28, 2022, 09:35:23 pmI have been with JLC for a few years now, must have had around 300 batches of pcb's made.In that time only had one problem.Their machine went wrong on one pcb and knocked a 6mm hole in middle of pcb.They told me and said I would be down one pcb which I said was fine.So got the pcb's in and sold some on.Then get a stroppy email saying their pcb had a 6mm hole in it !JLC had sent me the bad pcb in with the good ones !I didnt think for one moment they would do that or even why.I have used many pcb manufacturers over the years and JLC are just unbeatable for service and quality.

author: thm_w
author_rank: Super Contributor
timestamp: March 28, 2022, 10:26:49 pm
content: Thread here already:https://www.eevblog.com/forum/eda/pcbpartner-new-sponsor/
What should I look for in a DC-DC converter to ensure FCC SDoC compliance? - Page 1
Forum section: electronics / general

author: cdevidal
author_rank: Regular Contributor
timestamp: April 12, 2022, 05:37:26 pm
content: Need to convert 12VDC to 3.3VDC 500mA (1.65W) and ensure a smooth pass on theFCC Suppliers Declaration of Conformity (SDoC) lab tests, formerly known as FCC Verification. So I need low noise and simple drop-in addition. The device is a chicken coop IoT device running ESP32, so it's outdoors in a weathertight enclosure and typically uses 250mA. What sorts of things should I look for in a converter to pass SDoC? Here's one example I've been eyeing, is it good enough? Approval agencies: CB Scheme, EN, IEC, UL, RoHS compliant.https://www.digikey.com/en/products/detail/cui-inc/VXO7803-1000/7350296

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 12, 2022, 10:50:09 pm
content: Little modules like that, really don't matter too much, as far as emissions. None of them are filtered, or very much (or at least, the minimum size and cost ones), so they're more-or-less equally bad, and it's up to you to add filtering. The upside is, because it's just three pins, you don't have common mode. Add a filter choke at each (power) pin, then another cap to ground, and that will most likely do it.Additional considerations: damping/snubbing, usually with a lossy capacitor in parallel (electrolytic, or bigger ceramic + series resistor), may be relevant for input and/or output; input inrush or polarity protection (series diode, clamping TVS), overvoltage or inrush surge (particularly if not using a lossy capacitor on the input), etc.Also, is there anything else connected to the box? Like is it just a passive thing that receives power and nothing else wired to it? Or are there wires e.g. sensors, switches, servos, etc. wired off it? Wires act as antennas, both for emissions and susceptibility. The chance of something failing EMC goes up substantially when wires are added (for wire lengths comparable to the highest frequencies present; for SMPS, usually the low 100s MHz, so, a foot or more). Whereas a box on the end of a cable, can't do too much by itself in the common mode, but can transmit differential mode noise up the cable (which would need to be checked by a conducted EMI test -- this should be covered by the power adaptor you're using).Tim
What Photoshop/Gimp methods are you using for PCB reverse engineering? - Page 1
Forum section: electronics / general

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 16, 2022, 05:15:30 pm
content: I've bought a cheapo chinese ultrasonic cleaner, just for my own curiosity I began to reverse engineer the thing.Usually I use Photoshop/Gimp, drawing the traces on another layer over the pcb layer, and then blending it over the parts layer.I just wanted to know what are your blending/filtering options for best visibility?This my actual result:https://www.photopea.com/#idLmc6DlO

author: SMTech
author_rank: Frequent Contributor
timestamp: March 18, 2022, 09:50:24 am
content: How often does anyone need to do this? If you want to clone it there are legal questions and more often than not with something Chinese they've made design choices we would not make anyway. For repair, on this example one might just as easily whip out a pen.

author: daisizhou
author_rank: Super Contributor
timestamp: March 18, 2022, 12:43:58 pm
content: If you want to copy it, please remove the electronic components on the PCB.I think this kind of board is very simple, if you are willing to spend time, you can directly observe the PCB drawing schematic diagram

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 19, 2022, 07:43:33 am
content: If I want to copy what? Unpopulate everything? Make the schematic from it? Really?I've seen some people post this kind of overlays looking great, making easier to follow the traces, I just asked which filters would you use.Why all that completely unrelated stuff? If you don't like/do this, please just don't answer.Of course I'm doing the schematic, and if you had read properly, it's just to fullfill my own curiosity and check if I can improve it.

author: Shock
author_rank: Super Contributor
timestamp: March 19, 2022, 03:03:15 pm
content: Create layers like you are viewing the top layer of a pcb, so you have mask, traces, holes or pads. Then the top transparent layer should be components. But the barrel distortion and pink pcb background in the component image you posted adds a lot of "noise" to the image. So for best results resolve the barrel distortion with the camera distance/lens and edit out the pink background in the editor. If you don't like the contrast between the pcb layers and the component layer you can adjust it's palette, depth or run a filter over it.Alternatively you can use a grey or a light sepia palette (anything that strikes a good contrast with the trace color) and use that as a solid bottom layer with the transparent trace layer on top. But I'd rather make board layout images (see below), more useful information and easier to read with multiple layers.
Charmhigh CHMT48VB Component rotation left stacks versus right stacks - Page 1
Forum section: electronics / general

author: deanclaxton
author_rank: Regular Contributor
timestamp: March 24, 2022, 06:44:14 am
content: Quick question - for the CHMT48VB with feeders on both sides, does it automatically account for the rotation of the component when the right side feeder is used versus left? Or do I need to add 180 degree rotation?ie can I reference based on the tape and not have to worry about adding 180degree rotation if its on the other side (https://mcuoneclipse.files.wordpress.com/2020/05/rotation-in-tape.png) or is it totally dumb and I need to take the tape orientation into account when checking the component rotations?Trying to get my head around the Charmhigh convertor tool which automatically applies a -90 degree correction to the altium pick and place data. Comparing the resultant rotation versus tape, but wondering if the tape on the right side needs to be adjusted by 180 degrees. I guess I will have to suck it and see, but if someone knows the answer off the top of their head I'd be grateful.

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: March 24, 2022, 05:14:17 pm
content: I have a couple of those machines.Their converter software is flaming hot garbage, seriously. It is nasty. You will end up going over every component to get the settings right.The machine itself is meh. I would not even consider smaller than 0805. NEVER have tape pull speed over 5%, even for 8mm passives. It randomly places SOT23 components at an odd angle, due to errors with the machine vision alignment AI. The acceleration values for the kinematics are overly aggressive and non-adjustable, so going with vision off makes a mess of placing.I would HIGHLY, and I meanHIGHLYrecommend getting setup with AgnosPCB for visual AOI. Super neat system, we use it for all our PCBs, and very reasonably priced. It will catch the errors that the 48VBWILLgive you, and let you correct them before reflow.
Adam Maxwell winding machine and Plato solder pot parts - Page 1
Forum section: electronics / general

author: jonpaul
author_rank: Super Contributor
timestamp: March 14, 2022, 03:50:22 pm
content: bonjour à tousOur solder pots and winders are getting old and tired (like me!)The manufacturer of our solder pots, Plato is long defunct.We use 301-1 and 101-1 500W and 350W with porcelaine crucibleThe fine Adams-Maxwell winders went all digital models 1201, unreliable and very high costUsing 1201-2, 2AXThe mechanical counters were on model 1200, no longer available or serviced.Model 1201-2We seek any parts cache or working unitsPots...crucible, temp control heating élémentsWinder...motors, countersLocation USAmany thanksJon
SO8 package on Power-SO8 footprint - Page 1
Forum section: electronics / general

author: jeffidk
author_rank: Newbie
timestamp: March 08, 2022, 12:20:56 pm
content: Hello,I currently use a pair of MOSFETs on my PCBA, that are from Vishay and have the PowerPAK-SO8 package. Because of the current components shortage, I have problem to source the original or alternative MOSFETs with that package, but I have found a couple of alternatives with the traditional SO8 package. The SO8 part should be fine with my design.The Vishay datasheet states that one can use the PowerPAK SO8 on the SO8 footprint, but what about the other way around?Right now my pastemask covers the pins and copper area of the PowerPAK SO8 footprint. Should I leave it that way if I want to solder the SO8 package on it? (I am concerned about the extra solder paste under the component.) or should I change the paste mask as shown in red on the attachment? (Here I could be worry about the solder paste moving under the component and leading therefore to a bad soldering of the 4 drain pins).Thank you in advance for your comments.Regards, Jeff

author: wraper
author_rank: Unknown
timestamp: March 08, 2022, 12:26:41 pm
content: The issue is that solder may be sucked away from the pads by unmasked copper polygon. Solder paste under the part will do no harm.

author: jeffidk
author_rank: Newbie
timestamp: March 08, 2022, 01:00:35 pm
content: Hi Wraper,Thank you for the fast reply. It is great if I don't need to modify the stencil./Jeff

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 08, 2022, 01:24:40 pm
content: I'd think it would be better with the large pad masked off, but with some YMMV, namely that HASL plating and leaded solder might spread further over the area, compared to lead-free, or ENIG or OSP plating/coating.The main thing the excess solder will do, is tend to lift the component, and its flux will be glommed up under it, even more difficult to wash than usual.To be clear, I doubt you'll have a connectivity problem either way, and there are probably more situations where the reduced solder results in poorer soldering (because it spreads out enough to be annoying), than where the excess causes problems.Tim

author: Matt-Brown
author_rank: Regular Contributor
timestamp: March 08, 2022, 01:33:05 pm
content: Depending how close other parts are to the power pad part, jst add kapton tape to the underside of the stencil over the power pad area

author: jeffidk
author_rank: Newbie
timestamp: March 08, 2022, 07:34:01 pm
content: Thank you everyone for your contribution.CheersJeff

author: wraper
author_rank: Unknown
timestamp: March 08, 2022, 07:37:03 pm
content: Quote from: Matt-Brown on March 08, 2022, 01:33:05 pmNot a good idea, you can put it on top (won't last many passes), however on the bottom it will cause solder paste squeezing under the stencil for other pads of this footprint.
Assembleon Emerald Xii / Yamaha GEM servo motor failures. - Page 1
Forum section: electronics / general

author: ninevoltz
author_rank: Newbie
timestamp: March 04, 2022, 07:48:37 pm
content: Just an informational thread for anyone who owns an Assembleon or Yamaha pick & place. If you start getting servo motor over current faults, it's probably because your servo motor is disintegrating internally. I tore one completely apart today, and from what I can see, it appears that the stator laminations develop surface rust that slowly erodes off and adheres to the rotor magnets. Eventually enough metal comes off that the motor starts to jam up internally. See the attached photos to understand what I'm talking about.

author: ninevoltz
author_rank: Newbie
timestamp: March 04, 2022, 07:49:19 pm
content: After a little cleanup

author: ninevoltz
author_rank: Newbie
timestamp: March 04, 2022, 07:58:08 pm
content: I also don't think it would be possible to rebuild these motors. You pretty much have to destroy them to take them apart. It has a glass position encoder wheel that is incredibly easy to break. It also looks like they glue the encoder's shaft coupler to the motor shaft when they press it on. It would take a special small gear puller to pull it off.

author: thm_w
author_rank: Super Contributor
timestamp: March 04, 2022, 10:40:49 pm
content: Odd to develop internal rust, isn't it fairly well sealed?Is your area near an ocean, or very high humidity?But yeah you are right these type of servo are sometimes very hard to take apart or attempt to maintain..

author: ninevoltz
author_rank: Newbie
timestamp: March 04, 2022, 11:19:25 pm
content: We bought the machine used, last year. It has been quickly declining in function. We started having trouble with the nozzle exchange station then the servos started failing. Within the same week. I think it spent its life on the east coast of the United States. It was built in 2007. Has clocked slightly over a million component placements.
Altium+cnc pcb pad issue - Page 1
Forum section: electronics / general

author: RectangularThom
author_rank: Newbie
timestamp: February 18, 2022, 12:02:35 am
content: I have a double sided pcb to design and I am gonna mill it myself with my cnc router.Since I dont know how to plate via/pads, I need to configure altium to used only the opposite layer for through-hole componentsI tried using a custom via/pads library to make single sided pads by deleting the opposite layer but altium put them back when I use it.Next I tried to keep using normal pads but making design rules to prevent connecting traces to the same layer as the component but I cant make it work eitherI think I'm gonna try making holes with traces around them instead (in the component footprint itself)

author: RectangularThom
author_rank: Newbie
timestamp: February 18, 2022, 06:55:31 am
content: Nothing worked since Idk how to prevent connections based on component classI just ended up verifying manually

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 18, 2022, 03:13:07 pm
content: What do you mean prevent connections? Is this an autorouter problem?You can make a custom pad stack by placing a pad on bottom layer only, for example, then a separate unplated hole in the same place. Check that the hole is set to "No Net" and add a clearance rule allowing them to overlap in that particular circumstance (e.g. in applicable footprints). (It may help to name the holes '0' or something like that, while the pads are named as usual for association with the schematic symbol.)Tim

author: RectangularThom
author_rank: Newbie
timestamp: February 19, 2022, 07:43:10 pm
content: The pcb is being mill as I write this but since I'm pretty sure there will be a revision, I'll make sure to try this. Thx!And it's not really an autorouter problem, more like the ground polygon pour make altium think pads are connected because it thinks the pad will be connected on both sides

author: free_electron
author_rank: Super Contributor
timestamp: February 19, 2022, 08:03:09 pm
content: just leave the pad on both sides. you can use it as a via by soldering tap and bottom...

author: RectangularThom
author_rank: Newbie
timestamp: February 20, 2022, 03:41:57 am
content: I dont think so since I cant solder underneath components like screw terminal. Only the opposite layer is easy to solder

author: tooki
author_rank: Super Contributor
timestamp: March 12, 2022, 05:48:26 pm
content: I still don’t understand what the issue is. Just lay out your traces and ground pour on the bottom layer only and that’s that.
Improved protoboard design with 2.54mm holes - Page 1
Forum section: electronics / general

author: Picuino
author_rank: Super Contributor
timestamp: February 25, 2022, 08:44:26 pm
content: Attached photo and gerber of a plate to solder prototypes with 2.54mm separation holes.It has the following characteristics:- Total size 100x100mm to make it cheaper to order its manufacture.- Two vertical rails (for Vcc and Gnd) with front and rear copper- Three horizontal separate lines with 3, 3 and 2 connected holes each side.- Plated holes (easy and robust welding)- Small rings on the front face around the holes to be able to solder SMD components like caps or resistors.I have been working with this board for several years now and it has been very useful, especially since I prefer to have to connect separate lines by soldering a wire, than having to separate the lines of traditional breadboards with a drill or cutter.Many times what I do is order a custom pcb, but when it comes to making a quick prototype they come in handy.I hope it helps someone else.

author: TimFox
author_rank: Super Contributor
timestamp: February 25, 2022, 08:52:18 pm
content: I find similar boards with plated-through holes and power busses very handy for experimentation.One suggestion: your silkscreen shows row numbers 1,2,…. . It would be useful to add column labels A,B,C…

author: Picuino
author_rank: Super Contributor
timestamp: February 25, 2022, 08:52:48 pm
content: An example of a board I'm working with right now.

author: Picuino
author_rank: Super Contributor
timestamp: February 25, 2022, 08:55:32 pm
content: Quote from: TimFox on February 25, 2022, 08:52:18 pmThanks for the advice.So far I have made 10 plates and I don't think I need more. Also I can't find the KiCAD file with which I designed it to be able to make changes.If I ever find it, I'll upload it for whoever might find it useful.

author: Picuino
author_rank: Super Contributor
timestamp: February 26, 2022, 10:44:16 am
content: I have found the project in KiCAD and I have attached it to the first post.
Due to insufficient components, affecting pcb manufacturing and assembly - Page 1
Forum section: electronics / general

author: Aarom
author_rank: Newbie
timestamp: February 24, 2022, 09:45:56 am
content: Regarding the recent lack of component inventory, how did you effectively solve the problem of pcba project promotion? Please share your effective experience.

author: Psi
author_rank: Super Contributor
timestamp: February 24, 2022, 09:59:36 am
content: I redesigned it to use different parts every single time I ordered more of themand I am not happy about it.Sometimes even redesigning it between clicking go on the PCBA payment page and the PCBA house getting around to ordering the parts by which time they are now sold out.
Infineon take over of Cypress and PSOC shortages - Page 1
Forum section: electronics / general

author: labnet
author_rank: Contributor
timestamp: January 18, 2022, 07:03:55 am
content: Anyone got any inside knowledge on the infineon takeover of cypress.We can't get any PSOC5/6 for love or money at the moment.It's like they bought the company then forgot to make any of their products. A serious pain!

author: ataradov
author_rank: Super Contributor
timestamp: January 18, 2022, 07:41:48 am
content: Are you really not aware of a global supply shortages of almost any MCUs?You can't get anything that is in demand from any vendor.

author: Mangozac
author_rank: Frequent Contributor
timestamp: January 18, 2022, 08:47:39 am
content: Quote from: ataradov on January 18, 2022, 07:41:48 amFixed it(it sure feels like that at the moment)Seriously though, there was a brief period in late 2021 where it looked like things had stabilised but cut to Jan 2022 and it has gotten even worse. We're struggling to even get electrolytic caps now!

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: January 20, 2022, 04:37:23 pm
content: One thing I just noticed a few days ago on infineon's website. PSOC 4 and PSOC 6 families are contained in the current micro's subfolder where-as PSOC 5 LP is now classified and sorted in the legacy processor folder. It seems PSOC 5 is not long for this world even though they are still marked active status.

author: labnet
author_rank: Contributor
timestamp: February 22, 2022, 05:40:13 am
content: Yep. I noticed that as well.Seriously pi$$ed when we have spent over $100k developing a product with 5LP at the core.The situations only gotten worse in the last couple of months. Infineon aren't even quoting on stuff anymore.Even their much newer PSOC 6 series has barely any stock anywhere.I'd say Infineon bought Cypress, and the infineon guys decided to ignore them. There's always one culture that dominates.It's a shame as the PSOC series have had great dev tools for design that need some custom logic.
get ICs back into market stream when they'd be thrown away - Page 1
Forum section: electronics / general

author: consumererik
author_rank: Newbie
timestamp: February 17, 2022, 02:55:23 pm
content: I'm sure everyone is noticing how hard it is to find integrated circuits these days. I've heard that large companies sometimes throw out components that aren't needed, and this strikes me as wasteful. I also wonder if board assembly houses throw out part overages. Does anyone know? It would interesting to try and get these parts back into the market, right?

author: edavid
author_rank: Super Contributor
timestamp: February 17, 2022, 03:18:47 pm
content: Quote from: consumererik on February 17, 2022, 02:55:23 pmAny substantial quantities are sold to brokers/gray market distributors. This has been going on since the first days of semiconductors.

author: DBecker
author_rank: Frequent Contributor
timestamp: February 17, 2022, 04:26:05 pm
content: Until they closed a few years ago I used to buy partial reels of parts for $1 from HSC in silicon valley.Even at that price, people weren't lined up to buy them and I was very selective. It certainly wouldn't be worth a shipping fee.There are a huge variety of parts. It's almost impossible to match any surplus with those that need the parts.No commercial project will design around parts with uncertain quantity and future availability.But the real killer is that old parts are a process nightmare. Once the seal is broken, the open-air lifetime might be as short as 48 hours. For parts with looser requirements, baking might be required. Perhaps the parts have oxidized for a decade, not a week as the vendor suggested. Hand re-work to replace components that fell off or failed from bad solder joints during test could be 1000x the part cost. It could be a million times more expensive if they fail in the field.

author: edavid
author_rank: Super Contributor
timestamp: February 17, 2022, 05:07:58 pm
content: Quote from: DBecker on February 17, 2022, 04:26:05 pmThat's because they didn't sell the valuable parts in the store, on ly the leftovers.In Silicon Valley, Excess Solutions and Jameco/Arndt both have big gray market operations.Of course Arrow has Verical, and Digi-Key is trying to get in on the action via Marketplace sellers.
PCBA reverse engineering service recommendations - Page 1
Forum section: electronics / general

author: brazed_blotch
author_rank: Newbie
timestamp: January 31, 2022, 05:08:27 pm
content: I need the design files and a BOM, as well as layer thicknesses. I also need the firmware from an SPI memory IC on the PCB. Traces on the layout need to be plotted exactly how they appear on the board (I'm hoping to pass FCC certification as an intentional emitter). I'm not sure how many layers the board has but it's at least four, so I don't think I'd be able to accurately replicate it myself.I'm looking for recommendations as well as objective comparisons, and if you have any experience with particular vendors then your input would be greatly appreciated.Thank you in advance!

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: January 31, 2022, 11:27:22 pm
content: Are you trying to make a 1:1 copy of the original board?

author: rob77
author_rank: Super Contributor
timestamp: January 31, 2022, 11:38:13 pm
content: fabs in china are good at stealing someone else's design , try to contact the fab building those boards, probably they will happily spin some for you as well

author: brazed_blotch
author_rank: Newbie
timestamp: February 01, 2022, 01:59:14 pm
content: Yes, that's exactly what I'm trying to do - I'll probably change some things afterwards but I do want a 1:1 copy ideally.

author: Bonnie Zheng
author_rank: Newbie
timestamp: February 10, 2022, 06:36:48 am
content: As far as I know, the physical board needs to be provided in order to copy.So that you can get the PCB,BOM list and pick and place file.

author: brazed_blotch
author_rank: Newbie
timestamp: February 16, 2022, 05:32:53 pm
content: Quote from: Bonnie Zheng on February 10, 2022, 06:36:48 amI already have the board (multiple copies) so this is a non-issue. Do you know where I can get it reversed engineered? Somewhere reputable?

author: Bassman59
author_rank: Super Contributor
timestamp: February 17, 2022, 02:24:45 am
content: Quote from: brazed_blotch on February 16, 2022, 05:32:53 pmAnyone "reputable" will want to know why you need this work done.
Surplus parts to sell - Page 1
Forum section: electronics / general

author: jrs45
author_rank: Regular Contributor
timestamp: February 10, 2022, 09:07:20 pm
content: We bought some extra semiconductors that are undoubtedly in demand, in preparation for a product revision that's now been deferred. (We bought enough for around a year, but we can't count on getting more for 2+ years, so we shelved the project.) Quantity in the low thousands, probably a street value of $20k, give or take.What's a clean and reasonably safe way to sell these to someone who might need them? I'd rather not do ebay but if it's the best option...

author: thm_w
author_rank: Super Contributor
timestamp: February 10, 2022, 10:47:59 pm
content: Would say Ebay or here although those quantities are starting to get high. I recall some earlier threads but can't find them at the moment.Whats the part number?

author: sam512bb
author_rank: Regular Contributor
timestamp: February 11, 2022, 03:21:57 pm
content: Good day,Ebay does not reach the audience you want and in my experience it has a number of issues especially regarding returns, etc. For example, if someone opens up the sealed packages and then decides to return the items, Ebay may or may not be in your corner... or even PayPal for that manner. Sadly, some buyers (and sellers too) can be pretty shifty.NetComponents reaches a more informed audience, but does require a paid subscription if I recall. If anything, you could contact your contract manufacturer (CM) (if you have or know one), as many CM's use NetComponents for sourcing etc and so they may be able to offer your parts on NetComponents on your behalf. Failing that you could contact some of the Overseas parts suppliers to see if they would be interested.Please post up with whatever you choose to do.Cheers,Sam

author: thm_w
author_rank: Super Contributor
timestamp: February 11, 2022, 10:19:59 pm
content: Looks like NetComponents is free to sell, but its not clear how payment is performed and if there is a cut of that (they say escrow is available, but don't list a price).Quote

author: 48X24X48X
author_rank: Frequent Contributor
timestamp: February 12, 2022, 01:45:55 am
content: What's the part number? I'm sure there's plenty of buyer here.

author: Shock
author_rank: Super Contributor
timestamp: February 12, 2022, 06:31:50 am
content: Negotiate to return them to the supplier minus a restocking fee.

author: Doodly2000
author_rank: Contributor
timestamp: February 13, 2022, 10:57:03 am
content: Why not post an Excel? For sure ther might be some interest

author: jrs45
author_rank: Regular Contributor
timestamp: February 15, 2022, 03:21:53 pm
content: Thanks! These are ADI DSP's, 1451 and 1452 primarily.
Get the PCB House to program MCU - Page 1
Forum section: electronics / general

author: Saimoun
author_rank: Frequent Contributor
timestamp: February 13, 2022, 10:54:48 am
content: HiI want to manufacture about 1000 units, and I am asking my PCB house (NextPCB in China) to program the MCU before soldering.My questions:1) Is that a good idea, or would it make more sense to rearrange the board (add programming pins) so the MCU can be programmed after soldering?2) Do PCB Houses know how to program MCUs, i.e. should I just provide the file, or do I need to provide a programmer, instructions and so on?Just FYI the MCU is a Giga Device GD32E230Thank you!Simon

author: rea5245
author_rank: Frequent Contributor
timestamp: February 13, 2022, 02:23:51 pm
content: Microcontroller manufacturers often offer a service where they will program the chips for you. That's probably a better way to go.Does your board have a way to update the firmware if necessary?

author: Kean
author_rank: Unknown
timestamp: February 13, 2022, 03:02:24 pm
content: 1) It is always a good idea to have programming/JTAG interface available on your PCB in case of incorrect firmware load, or a late bug discovery. The Tag-Connect footprint is quite popular for this.2) MCU vendors and some distributors do offer programming services for quantities like you mention, and are set up specifically to offer the process including re-reeling if needed (trays are probably more common in this case). A PCB assembly house may have access to a chip programmer, but not necessarily one that is compatible with your device and footprint. It may be possible they will have access to a JTAG programmer with some standard cables, but in most cases for a one-off production run they would expect the customer to provide the programming tool or a test jig.And make sure you are comfortable with whoever you task this with having access to your firmware. If you want to protect it, you might want to do it yourself and/or organize enabling the appropriate flash & JTAG security protections. Not perfect, but will provide some protection.

author: Saimoun
author_rank: Frequent Contributor
timestamp: February 15, 2022, 10:37:59 am
content: Thank you both for the replies@rea5245: no firmware update by customer, the product is too cheap for that.I understand about providing them the hardware and software to program the chips, that's fine. And yes I know about the firmware - well you kinda have to trust someone at some point anyways.The thing is I actually already have a Tag-connect plug for testing, to use with a custom made PCB which will test the boards.But all pins are already taken, and the SWD pins are like "far away" on the board (it will take long traces to get them to the test connector).
DEK horizon 03i Stencil printer issue - Page 1
Forum section: electronics / general

author: luckyluke
author_rank: Newbie
timestamp: February 10, 2022, 06:54:28 pm
content: At our company we own a DEK horizon 03i stencil printer wich worked fine until today. When was turned on it wouldnt initialize, and DEK_PCCM software shows the following message: "cannot initialize NextmoveE5 card. software is unable to proceed" and DEK_CSS shows program error. Has anyone encounter this problem? NextmoveE5 card shows no problem (LED¨s on card and digidisplay shows no issue)

author: SMdude
author_rank: Frequent Contributor
timestamp: February 13, 2022, 07:56:15 am
content: Not at all familiar with it, but I'd first be pulling the card out and refitting it.Then I'd be looking at it's communications and see if it is transmitting/receiving from what ever else it talks to.My pick and place machine had all sorts of issues when I first set it up and I found that one of the cards had wriggled slightly out of its socket.

author: mon2
author_rank: Frequent Contributor
timestamp: February 14, 2022, 03:50:14 pm
content: Post the same details on smtnet.com and you should hear from other owners / techs for a possible resolution.
Alternative for SCART type C cable  - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: March 04, 2022, 12:40:23 am
content: Hey AllHave a bit of an odd one, I have been asked to find a replacementSCART type C (c as in combined) cable. The cable we have been using up to now isRS PRO 7492471 (RGW-1661-2), datasheet attached. The thing to note about this datasheet is when they say conductor #, they mean conductor group/pair not individual conductorSo far I have contacted:Van Damme(not the actor)S2Ceb-Groupe CaeAlpha Wireas all had similar looking cablesBut I guess the question is, do yous know of anyone else that makes SCART type C (or whatever the correct name is) cables?
Integrating plugpacks directly into the product (Ryobi) - Page 1
Forum section: electronics / general

author: thm_w
author_rank: Super Contributor
timestamp: December 31, 2021, 05:19:35 am
content: I'm sure you've done this before for a hobby project or I've use on some repairs.But interesting to see how they've made an injection molded case to fit around a standard plugpack, and expose the mains connectors out the end. Save time from cutting the end of the cable off and soldering it to a panel mount connector.First one is a soldering iron, of questionable quality:Second is the LED:From the full video here:https://www.youtube.com/watch?v=0xUqBB4FiOQ

author: posatomic
author_rank: Contributor
timestamp: February 08, 2022, 01:40:59 pm
content: Pretty interesting solution. I would definitely check if this whole assembly has been certified by someone.Chances are the manufacturer was thinking "just toss the certified pack in there and slap a CE sticker on top, and we should be good". Obviously it doesn't matter if you use certified components or not if the whole assembly isn't certified.