hybridfree/eevblog-posts huggingface dataset:
PCB-is TG 170 -180 material worth it? - Page 1
Forum section: electronics / projects

author: Sariel
author_rank: Regular Contributor
timestamp: November 19, 2023, 07:55:50 pm
content: Hey everyone,I'm in the process of finalizing a 6-layer PCB for manufacturing and considering assembly services as well.While using PCBway's quote service, I observed that the price doubles when opting for TG material of 170-180 instead of TG 150-160.Is it genuinely worthwhile to go for PCBs constructed from TG 170-180 material?What do you think?

author: ejeffrey
author_rank: Super Contributor
timestamp: November 19, 2023, 08:40:16 pm
content: Without knowing about your application or circuit, assume no. Standard FR4 with Tg around 140 C is absolutely fine for most purposes.If you are going to expose your PCB to high temperatures, do multiple reflow steps, need high dimensional stability you might need to pay for the higher Tg.
PCB Layers - Page 1
Forum section: electronics / projects

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: February 03, 2013, 10:59:41 pm
content: I searched for ordering a PCB and i found out that i need to input a layer number...What does the layer number means at PCB's?

author: Psi
author_rank: Super Contributor
timestamp: February 04, 2013, 01:24:59 am
content: My guess would be that it's the number of copper layers on the PCB, 2, 4 etc...

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: February 04, 2013, 06:13:33 am
content: Ok but what the layers do to a PCB (thicker traces and stuff i mean)??

author: nanofrog
author_rank: Super Contributor
timestamp: February 04, 2013, 08:59:01 am
content: Quote from: ChrisGreece52 on February 04, 2013, 06:13:33 amI think you're referring to the copper weight, which is what determines the trace thickness.

author: psycho0815
author_rank: Regular Contributor
timestamp: February 04, 2013, 09:01:54 am
content: Basically you can picture layer like storeys in a house.If you put your traces on different layers, they can cross each others path without making a connection.If you want a connection between traces (or planes) on different layers you need a plated hole in the pcb usually a via or component hole.That way you can pack your board very tightly with components and traces. It is hoewever considered good practice to keep your layercount as low as possible.2 layers is pretty much standard these days for hobbyprojects and the like.Everything above 4 can get expensive rather quickly..

author: poorchava
author_rank: Super Contributor
timestamp: February 04, 2013, 10:11:01 am
content: Actually even 4 layer boards are very expensive for low quantity. First example would be itead-tyle chinese services. 1pcs of 5x5 2 layer costs $10 and the same for 4 layers costs $65. I think this is because you can fabricate 2 layer pcb out of premade double-side copper clad laminate while for 4 layer pcb you need quite difficult lamination process to fuse the layers together.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: February 04, 2013, 12:42:42 pm
content: Got it thank you
PCB layout critique - Page 1
Forum section: electronics / projects

author: iampoor
author_rank: Frequent Contributor
timestamp: September 12, 2015, 08:03:05 am
content: HiI am working on building a guitar graphic eq. Pretty generic filter stages, 30mm slide potentiometers to control gain.I have never laid one of these eq stages out before. How does this look as a starting point? Any tips would be appreciated. I am self taught, so if I am making any obvious mistakes, please let me know! Not all of the connections are present on the PCB yet, just trying to determine the best layout for the filter components, as it will be duplicated across the PCB.Thanks!

author: bookaboo
author_rank: Frequent Contributor
timestamp: September 12, 2015, 11:08:30 am
content: Maybe use one side of the board as a ground plane and increase the width of your tracks. I like to make all tracks as wide as possible regardless of how little current they are to carry. I also like to have caps as close to the IC they are decoupling as possible.

author: iampoor
author_rank: Frequent Contributor
timestamp: September 15, 2015, 04:52:20 pm
content: Quote from: bookaboo on September 12, 2015, 11:08:30 amHi, Yes, Ground plane is planne for the other sie of the board, coupled with vias from the top at every ground connection.What is the advantage of larger traces?Yep, decoupling will be added soon!Right now, Im really just concerned about the layout of the parts...will it lea to oscillation? etc.

author: con-f-use
author_rank: Unknown
timestamp: September 15, 2015, 06:56:09 pm
content: Quote from: iampoor on September 15, 2015, 04:52:20 pmMainly- Less resistance- Better thermal performance- More robustness
PCB Layout Designer - Page 1
Forum section: electronics / projects

author: larc345
author_rank: Newbie
timestamp: October 11, 2016, 07:07:41 pm
content: We have a project that stalled due to turnover. We are needing a proof of concept design and layout for a device that uses 12VDC and can send a bluetooth signal to a phone. We currently just need it to "ping" the phone. We do have materials. Any suggestions or perhaps someone willing to take on this project. We have a second device that needs the same credentials.

author: grouchobyte
author_rank: Regular Contributor
timestamp: October 11, 2016, 07:28:08 pm
content: You used the words "....just need it to...."That in my experience is the beginning of a disaster. Nothing is that simple, but heck its your money.My hourly rate is $140 per hour. I get that all day long and only because I dont take on projects that contain those words@grouchobyte

author: rx8pilot
author_rank: Super Contributor
timestamp: October 11, 2016, 07:53:16 pm
content: Do you need a PCB layout designer or an engineer to design the circuit? It sound like you need the EE as I attempt to read between the lines. There is a huge difference. Are you expecting the same person to troubleshoot and test the design? Do they need to deal with the software that will control the device?Like @grouchobyte, I will not accept open ended work that does not have a clear goal unless they are willing to blindly pay the hourly rate until something good comes out of it. I would assume there is a budget boundary of some sort and a time table as well.Broad questions are not likely to get any useful answers.

author: tautech
author_rank: Super Contributor
timestamp: October 11, 2016, 08:01:41 pm
content: Quote from: larc345 on October 11, 2016, 07:07:41 pmWelcome to the forum.This is your guy:https://www.eevblog.com/forum/profile/?u=92330;area=summary

author: grouchobyte
author_rank: Regular Contributor
timestamp: October 11, 2016, 10:23:23 pm
content: Quote from: tautech on October 11, 2016, 08:01:41 pmYes, Tim can do probably anything. He has shown us (and yours truly) time and time agin that he is helpful and competent. I would bet that even Tim would pass on the "opportunity" IMHO, only a fool or a desparate fool would engage without requirements or specifics. Perhaps the OP will tip his or her hand.@grouchobyte

author: nctnico
author_rank: Super Contributor
timestamp: October 11, 2016, 10:59:25 pm
content: Quote from: rx8pilot on October 11, 2016, 07:53:16 pmI wouldn't take on any open ended project. Ofcourse you can do a project in stages to minimise the risk for the client. Anyway a generic question can be the beginning of an interesting project so that wouldn't be a reason for me to turn a project down.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 12, 2016, 01:46:33 am
content: I wouldn't mind, it's just that I'm busy juggling three other boards already...FYI, I would charge such a job as hourly. Want more features? I'll implement them, and bill the time required. Need more changes? Wash rinse repeat. Most equitable for both parties, in an open-ended project like that.Tim
PCB Layout question - Page 1
Forum section: electronics / projects

author: Unknown
author_rank: Unknown
timestamp: January 25, 2010, 05:53:02 am
content: hi all...I am trying to design a 2-layer PCB board for upconverter WIMAX 3,3Ghz.I use MIC TRF-1222 but I'm still confuse to make the layout design, can you help me with this stuff??

author: septer012
author_rank: Regular Contributor
timestamp: January 25, 2010, 09:23:21 am
content: Youtube.com search PCB tutorial would be my first suggestion.

author: Unknown
author_rank: Unknown
timestamp: January 25, 2010, 10:14:11 am
content: Anything involving high speed digital or RF (which high speed digital basically is) is very tricky to design, esp if you are using tools like eagle etc. Even Altium Designer is not up to analysis of these circuits...Things come into play at high frequency like the substrate (ie standard Double sided boards are Fibreglass FR4) thickness of substrate, plating thickness and type of plating, thickness of copper.....I am taking it that you are using an RF module, if you keep the distances from the module to the RF IO connectors as short as possible this helps... Also remember that traces at these frequencies act like mini antennas etc. etc.Just some things to think about oh also remember to go to the manufacturers website, they will have lots of appnotes that will show recomended PCB layouts, Substrate materials and thicknesses etc.HTH

author: Neilm
author_rank: Super Contributor
timestamp: January 26, 2010, 07:01:30 pm
content: For PCB layout tips and trick check outhttp://www.compliance-club.com/. Look for articles by Keith Armstrong. He has done several articles (and published a book) on tips and tricks for for producing PCBs. The site is primarily for EMC compliance - but good board design is good board design and having good layouts result in good EMC and good signal integrity.

author: Unknown
author_rank: Unknown
timestamp: January 27, 2010, 06:06:25 pm
content: Quote from: septer012 on January 25, 2010, 09:23:21 amthanks for your suggestion, but it's still hard to find good tutorial from youtube

author: Unknown
author_rank: Unknown
timestamp: January 27, 2010, 06:15:23 pm
content: Quote from: GeekGirl on January 25, 2010, 10:14:11 amthanks for this advice, I'm work in 3.3 GHz frequency by use of MIC TRF1222 as a main component, but I'm still confuse to choose the best layout so I can minimize anything that reduce component specs and ability.it's difficult for me to select the best decoupling capacitors for guarding against voltage drop.if you have another advice, please inform me, thanks..

author: Unknown
author_rank: Unknown
timestamp: January 27, 2010, 06:16:38 pm
content: Quote from: Neilm on January 26, 2010, 07:01:30 pmthanks for this information, I've checked it and maybe can help..
PCB Layout/DAC build - Page 1
Forum section: electronics / projects

author: EJC
author_rank: Newbie
timestamp: December 02, 2023, 08:26:17 pm
content: Hi Everyone!!!New here, just hoping to get a bit of advice/criticism. I'm doing an "upgrade" of a device used by a professor at my local university. It is a design from the late 80's/early 90's that I am adding a micro-controller to eliminate the old parallel port input and 555 timer sequencer. Keeping everything else in the design as close to the original as possible. I've built a few of these on proto-boards etc so the design works, but I'd like to make a surface mount PCB. I chose the parts/footprints mostly by what was available on JLCPCB as I want to have this built. I'm brand new to PCB design/layout so I was hoping to get some criticism on this design. I tried to separate the digital/analogue grounds to only meet at the power input if that makes sense. I attached the print with the original schematic, and my kicad files. Any advice would be welcomed and appreciated!!Thanks,John

author: liaifat85
author_rank: Regular Contributor
timestamp: December 04, 2023, 10:33:01 am
content: If your design is free of DRC errors, I think you can proceed to print the prototype.
pcb manufacture and assembly, double sided components or not ? - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: July 25, 2013, 08:19:57 pm
content: I'm making a project and I'm wondering what is the most cost effective solution for pcb size and automated assembly.The board is small and smaller means cheaper and a smaller cheaper box, so I could do double sided but does it cost more to place parts on both sides ? should i make the board slightly larger with everything on one side ?

author: wemme
author_rank: Regular Contributor
timestamp: July 25, 2013, 09:45:39 pm
content: Generally If you plan on making these in small to medium production then single is usually cheaper.If you go double sided you end up paying for another solder mask, set-up, loading pass and lap through the reflow oven and pcb is not that expensive in comparison.

author: 8086
author_rank: Super Contributor
timestamp: July 25, 2013, 11:45:52 pm
content: By using both sides you are doubling the machine time except pick and place.So yes it will be more expensive. How much is really anyone's guess. Get some quotes.

author: fcb
author_rank: Super Contributor
timestamp: July 26, 2013, 10:41:27 am
content: If you want to make things easy.Stick with a single sided load.Put THT on the same side as the SMT (makes for easier wave soldering).Rectangular PCB, with space down each side for the conveyor in the printer/placer and possibly wave solder.Put fiducials (1-2mm round pads, make sure they are blanked out on the stencil, and leave at least 0.5mm gap off resist - makes for better visioning) in the opposite corners, and at the corners of any fine-pitch parts.Make sure your ident doesn't go over the pads...Provide proper RS274-X Gerbers, check them with something like GC Prevue.Let them panelise the PCB..Check your BOM includes X/Y/Rotation coordinates, adjust so bottom-left of PCB is 0.00, 0.00Get a list of their preferred common stock items.Talk to them!
PCB Manufacture - Page 1
Forum section: electronics / projects

author: kvresto
author_rank: Regular Contributor
timestamp: September 28, 2016, 01:55:29 am
content: Hi Everyone.I've had about 3 PCB's made up for my projects up until now, and I used PCB Zone which has always done a great job. I recently filled in the quote form for PCBWay a Chinese company and it was significantly cheaper which is great. As I cant afford to redo my PCB with someone else if this cheap quote is in fact too good to be true, has anyone had experience with PCBWay, should I use them or stick with my current PCB house? The PCB is 156mmx86mm 2layer, and nothing special.Also San Francisco Circuits, and Bittele Electronics Inc almost took my cloths off, lucky I was holding on.thankskvresto

author: wraper
author_rank: Unknown
timestamp: September 28, 2016, 03:23:14 am
content: Unless you have some very strict requirements, they will be fine.

author: Siwastaja
author_rank: Super Contributor
timestamp: September 28, 2016, 04:59:38 am
content: No problems with their quality, they have provided what they specify (6/6 mil, 0.3mm holes IIRC).

author: hasithvm
author_rank: Contributor
timestamp: September 28, 2016, 05:36:29 am
content: Never had an issue with them, you get exactly what you pay for (sometimes you end up with extra boards, but never less).

author: kvresto
author_rank: Regular Contributor
timestamp: September 28, 2016, 06:42:01 am
content: Thank you all, good news.cheers

author: technotronix
author_rank: Regular Contributor
timestamp: September 28, 2016, 01:23:41 pm
content: I found them good and happy with product quality and turn around time.

author: suku
author_rank: Contributor
timestamp: September 28, 2016, 04:30:04 pm
content: Their boards are nice + they have very good customer service!
pcb manufacturing - Page 1
Forum section: electronics / projects

author: electros6
author_rank: Regular Contributor
timestamp: November 22, 2013, 03:02:23 am
content: Hi guys,i used altium designer to create my PCB of size 30mm circle. I create the gerber files and send to different manufactures , but they said not able to open my file. I created my gerber using the optionfile-> fabirating output -> gerberI also send HC drill files in the same formatPlease help

author: mazurov
author_rank: Frequent Contributor
timestamp: November 22, 2013, 04:46:10 am
content: Get yourself a Gerber viewer. Check Pentalogic - their Viewmate viewer used to be free, don't know about now. This is what most of boardhouses use to view Gerbers.

author: KJDS
author_rank: Super Contributor
timestamp: November 22, 2013, 09:58:20 am
content: GCPreview is another gerber viewer that I've used for years, though it does have an annoying user interface.

author: poorchava
author_rank: Super Contributor
timestamp: November 22, 2013, 10:40:31 am
content: Sometimes it's good to add some info to your production data regarding numeric format, zero suppression and measure system (metric/imperial).

author: AndersAnd
author_rank: Frequent Contributor
timestamp: November 27, 2013, 01:24:41 pm
content: PCB manufacturers often have online guides for design rules and how to correctly prepare a PCB for manufacturing and what file formats they accept etc.Example from Olimex:How to prepare your PCB files for order?https://www.olimex.com/PCB/TechnicalInfo/

author: calexanian
author_rank: Super Contributor
timestamp: November 28, 2013, 03:46:40 am
content: Hmmmm.... I use eagle, but I assume Altium has the same bewildering amount of options in the CAM processor, and of course every PCB house wants things differently. I have my cheat sheet of all the file types our house wants and some houses are better than others are guessing what you really meant. For short run things advanced circuits is pretty good. Use the barebones PCB cheap option to try it out. you get a board in a couple of days for super cheap if you don't need mask of silkscreen for prototyping.

author: calexanian
author_rank: Super Contributor
timestamp: November 29, 2013, 07:20:30 pm
content: Mechanical layer gets used regularly for the the stuff you don't know where else to put. Also CMP trace side is another place for "Where does this non trace thing go?" and a readme file to the cam handler on the other end explaining what you were trying to do.
PCB material for vacuum use? - Page 1
Forum section: electronics / projects

author: wreeve
author_rank: Unknown
timestamp: February 17, 2016, 10:21:28 am
content: Has anyone any experience in PCB materials / components for use in a vacuum? A quick google hasn't thrown up the expected results! I am worried about contamination of the "vacuum" when a PCBs environment is pumped; especially with FR4?

author: TassiloH
author_rank: Regular Contributor
timestamp: February 17, 2016, 10:41:41 am
content: Up to the 1E-6 mbar/Torr range FR4 is acceptable (at least if you do not fill up the whole vacuum chamber with FR4 pieces). Even most soldermasks don't seem to outgas too much, at least I know that one piece of vacuum equipment (specifically a Hexapod from Physik Instrumente/PI) uses a regular FR4 circuit board inside the vacuum. I have used long Kapton flex ribbons with FR4 rigid end boards and they didn't seem to influence the base pressure of the chamber (in the upper 1e-7 mbar range).One thing you have to worry about when putting electronics into vacuum is heat transfer, though. Basically heat can be dissipated only through the board and its mounting parts, no convection cooling. Component-wise: Avoid electrolytics (due to their rubber seal and the additional pressure difference). Plastic IC housings are ok in the range where FR4 is ok. Clean flux residue thoroughly from the board.If you want to go to the 1e-9/1e-10 mbar range, though, this is probably a different story.

author: awallin
author_rank: Frequent Contributor
timestamp: February 17, 2016, 06:58:51 pm
content: Rogers RO3000 or other Rogers stuff is used in UHV. Not necessarily cheapSolder e.g. Kester Sn96.5Ag3.0Cu0.5
PCB Mount DC Jack plug - Page 1
Forum section: electronics / projects

author: mintsoft
author_rank: Contributor
timestamp: October 04, 2018, 10:36:39 pm
content: Hi guys,I'm currently designing a test jig for some small form-factor PC's (Dell optiplex 3050 to be precise). I'm thinking that it will basically be a PCB with male connectors on that i can place the PC from the top into. I only really need Cat-5 + power, displayport and USB would be a bonus.I've found the METZ CONNECT AJP92A8813 which looks perfect for the 8P8C connector, however I've been unable to find any sort of DC jack plug PCB mount (presumably because they're not designed for that; plenty of *sockets* but no plugs) component. I'm looking for a way of maybe soldering a standard jack (4.5MM x 3.0MM) onto a PCB however I've not been able to see a way of making it work; I'm hoping that someone here might have an ingenious idea of how to achieve this that's better than loads of hot-snot?Any help anyone?

author: JustMeHere
author_rank: Frequent Contributor
timestamp: October 05, 2018, 12:38:22 am
content: https://www.digikey.com/short/jn5tvq

author: tooki
author_rank: Super Contributor
timestamp: October 05, 2018, 02:56:19 am
content: Quote from: JustMeHere on October 05, 2018, 12:38:22 amI think the OP is looking for a PCB-mountmalebarrel connector.

author: mintsoft
author_rank: Contributor
timestamp: October 05, 2018, 02:30:46 pm
content: QuoteCorrect! I want a PCB mount version of the attached

author: tooki
author_rank: Super Contributor
timestamp: October 05, 2018, 05:46:13 pm
content: Just had a thought: many barrel connectors use screw-on strain reliefs/shrouds. Couldn’t you make a matching threaded hole in your jig, and screw the plug in?

author: mintsoft
author_rank: Contributor
timestamp: October 05, 2018, 07:17:43 pm
content: Quote from: tooki on October 05, 2018, 05:46:13 pmThat is a very good idea! If I can source the plugs in that screw-on shroud format I'll definitely try that.At the moment I'm struggling to find the precise plugs as the solder-on replacement type. They always seem to be like:https://www.ebay.co.uk/itm/DC-power-4-5mm-x-3-0mm-with-pin-plug-connectors-cable-for-hp-envy-ultrabook-1-8m/202450127527?hash=item2f22f7caa7:g:P8EAAOSwtAlbpZZ-for some reason!

author: tooki
author_rank: Super Contributor
timestamp: October 05, 2018, 09:35:04 pm
content: I actually had another thought, namely that in most docking stations I've seen (for computers without a docking connector), they use slightly compliant plug mounts, to make insertion easier. So maybe mounting a cord like that into a custom holder isn't such a bad idea!

author: mintsoft
author_rank: Contributor
timestamp: October 05, 2018, 10:21:11 pm
content: Quote from: tooki on October 05, 2018, 09:35:04 pmThat's a good point, I wonder if I could basically use some sort of grommet to hold the cable in to give it some slight flexibility whilst still keeping it rigid enough to drop the machines in from the top
PCB Mount mini-XLR female, 4 or more pins (or similar connector) - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: November 28, 2023, 04:02:58 pm
content: I'm looking for a part similar to the above. The idea is to directly solder a small PCB (4 connections) to the internal pins.The connector should ideally be latching (not screwed) and fairly small. Also a female type so that there are no exposed pins on the PCB.So far I've found only chassis-mount mini types like AG4FCE and the PCB mounting connectors I've found are normal size, e.g. nc5fav-sw.It does not strictly have to be XLR.

author: jc101
author_rank: Frequent Contributor
timestamp: November 28, 2023, 05:34:23 pm
content: I was looking around for something similar recently, would the ODU Mini-Snap work for you?https://odu-connectors.com/ukThey can be had from Digikey and Mouser, the UK rep seemed happy to send samples. There is a contact mail address on their webpage. I got the impression direct pricing was vastly cheaper than reseller pricing...

author: 741
author_rank: Frequent Contributor
timestamp: November 29, 2023, 12:07:28 pm
content: Looks interesting, but are there some with more than 2 pins? (I need 4 pins).I found this on the sitehttps://odu-connectors.com/uk/find-your-product/results/?searchTerm=Mini-Snap#/show/S1CL0C-P02MCC0-2500

author: tooki
author_rank: Super Contributor
timestamp: November 29, 2023, 10:57:29 pm
content: Look at Binder. They have a bunch of stuff. Series 719, for example. They just snap in to mate, with surprising force.

author: Benta
author_rank: Super Contributor
timestamp: November 29, 2023, 11:15:39 pm
content: Lemo could be an option. Pricey, though.

author: tszaboo
author_rank: Super Contributor
timestamp: November 30, 2023, 08:47:38 am
content: I usually use M8 or M12 connectors, but then I'm designing industrial products. So depending on your target it might not be the most appropriate.
PCB mount socket connector - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: April 11, 2017, 01:44:03 pm
content: I'm trying to source PCB mount socket connectors something like this:https://www.digikey.com/products/en?keywords=ED1092TR-ND%20However in larger diameter, the pin diameter I have to mate with is 7.05mm and 8.7mmDoes anyone know a source for these?
PCB mount transformer (UL506) Fuse? - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: February 12, 2017, 10:29:30 pm
content: Let's say I have a product used in the USA with a small < 10VA transformer with 120V primary. The device that the transformer is installed in is powered from a 120V, 20A source, and is fused internally with a 5A fuse. Under normal conditions the transformer draws less than 100mA. If the transformer was overloaded or developed a fault it could draw (in theory) 5A continuously and over heatifthere was no internal thermal cut out.I seem to recall that UL 506 approved transformers must have an embedded thermal cut out. Is that correct?Link to data sheet, there is nothing describing fusing or if an internal thermal cut out exists. I would prefer to NOT have an additional fuse in series with the transformer (both to save cost as well as to improve reliability)http://www.mouser.com/ds/2/397/3FL24-250-29635.pdf
pcb mounting stubs - Page 1
Forum section: electronics / projects

author: lawrence11
author_rank: Frequent Contributor
timestamp: September 15, 2020, 08:03:03 pm
content: Hey I have a prototype board double sided, there is some probe points on each side and I want to flip and measure as I wish and tired to see precious things falling all the time not being held firmly etc...I will make a wooden table with 4 corresponding drill holesholes are 3mm dia. one is close to an antenna, I need a plasting equivalent on a corner.I need guidance.Some of the headers are pretty high, and there is a hole to consider in the wood.

author: rvalente
author_rank: Frequent Contributor
timestamp: September 15, 2020, 08:31:05 pm
content: I'm not sure If I'm following..Would you like to make a bed of nails or need a custom part to fit you board?Some drawing/picture would be useful

author: lawrence11
author_rank: Frequent Contributor
timestamp: September 15, 2020, 08:56:50 pm
content: theres a rectangular pcb with 4 corner holes.theres one of these corners thats like 2mm from a wifi module, would like a plastic thing here for this corner.I wanna elevate this hole thing, in a double sided symmetrical fashion.

author: langwadt
author_rank: Super Contributor
timestamp: September 15, 2020, 09:12:49 pm
content: Quote from: lawrence11 on September 15, 2020, 08:56:50 pmnylon threaded spacers

author: lawrence11
author_rank: Frequent Contributor
timestamp: September 15, 2020, 09:16:57 pm
content: bingo.thats the keyword.
PCB Mounting with electrical connection and vibration dampening - Page 1
Forum section: electronics / projects

author: LasPet
author_rank: Newbie
timestamp: February 03, 2023, 08:28:00 am
content: Hi!I'm trying to find a way to mount PCBs onto a metal plate in a good way that ideally accomplishes two things:1) Provide electrical connection between the PCB mounting holes that are grounded and the metal plate the PCBs will be mounted upon.2) Provide some vibration dampening for when the machine is shipped.Do you know of any mounting method/mounting component to accomplish this? Most PCB standoffs I've looked at accomplishes only one of the two criteria.

author: Haenk
author_rank: Super Contributor
timestamp: February 03, 2023, 10:02:46 am
content: star washers and silicone HDD mounting dampers likehttps://www.amazon.com/Akust-Hard-Drive-Vibration-Screw/dp/B00ZH8DXPYnot perfect, maybe add some flexible grounding wire just to be on the safe side...
PCB Mousebites - any recommended designs? - Page 1
Forum section: electronics / projects

author: deanclaxton
author_rank: Regular Contributor
timestamp: January 25, 2020, 09:04:51 pm
content: Hi all,I'm laying out a couple of small panels (approx 100mm x 100mm) at the moment, which will likely be produced by JLCPCB. I'm just trying to lock in the mousebite design (I'm using Altium to panelise, and have created the mousebite drill patterns as PCB footprints) and have come up with the variants in the drawing attached.There are a few different widths there. The mousebite holes are 0.5mm drill and spaced at 1mm centres, whilst the routing path is 2mm diameter.Interested in your thoughts, and whether you have a recommended mousebite design that breaks away clean and easily.Cheers,Dean

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 25, 2020, 10:11:36 pm
content: What's the thickness of the board? Is it going into an enclosure?1) It is important that these holes be non-plated. Copper in the hole is useless.2) Make sure you back off any copper from the breaking area. 1mm keepout around the drills should be good. Also the snap of breaking the tabs has been known to knock 0402 and 0201 parts off the board. How close are you putting small SMT parts to the tabs?3) I'd use the rightmost one. You will be surprised by how strong FR-4 material is, even drilled.4) I don't know what you mean by panel, the individual boards are called "biscuits", at least in Canada. The whole bunch of boards panelized is the panel.5) Are you including an assembly rail of some kind? Is this being sent out to be populated? Find out what they want, usually a 20mm rail is plenty and they might ask for fiducials and tooling holes (using a stencil?)6) Are there any connectors or other thingies hanging over the edge of the board? Try to avoid placing the bites there.7) I'd put two per 100mm side. Like I said, these things are stronger than they look and 100mm isn't big... or simply ask the assembly house. I took what they prefer and put that in my library.If your board is thinner you could also just use v-grooves.
PCB one size fits all - Page 1
Forum section: electronics / projects

author: gogoman
author_rank: Regular Contributor
timestamp: March 08, 2018, 02:37:11 pm
content: Hi I need advice for a PCB layout. Depending on the application the PCB will be trimmed to fit.The signal and power traces will be cut as pcb is shorten.The PCB is 4 layer (signal, ground, power signal).thanks
PCB Outline File for Diecast Aluminium Boxes - Page 1
Forum section: electronics / projects

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: June 21, 2020, 10:59:22 pm
content: I’m working on a project that will have a PCB in a small diecast aluminium box. The outline for the PCB needs a few radiused cutouts to fit the box. Anyone know of a company making these boxes that has a downloadable shape file I can import into a PCB layout program so I don’t have to create the board shape manually?

author: KMoffett
author_rank: Regular Contributor
timestamp: June 22, 2020, 12:25:56 am
content: http://www.hammondmfg.com/dwg.htmhttps://www.budind.com/view/Die+Cast+Aluminum+Enclosure/CN-Serieshttps://www.budind.com/view/Die+Cast+Aluminum+Enclosure/NEMA+4
PCB Panel Design Question - Page 1
Forum section: electronics / projects

author: Srijal97
author_rank: Contributor
timestamp: January 27, 2019, 07:04:56 am
content: Hello all,I'm working on creating really tiny PCBs (11x10mm) and I wanted SMD pins on the edges of the PCB like the ESP-12 module has. How does one go about designing a PCB like that in the design software(I use EAGLE), and how exactly do you place the order for such PCBs? From what I've read, you have to create a PCB panel and then break them once is manufactured, but how do you add the break marks, plated holes and copper pads on the edges in the design software and instruct the manufacturer what I expect?I've attached a sketch I made showing what I wanted to do. Thank you for your time!

author: nsrmagazin
author_rank: Regular Contributor
timestamp: January 27, 2019, 07:19:29 am
content: If its like in my avatar, you just create the wholes(must be plated) then you solder pins manually. It can be done by the manufacturer, but I don't know if they offer it everywhere.

author: Rerouter
author_rank: Super Contributor
timestamp: January 27, 2019, 07:24:33 am
content: They are called castellations, and the sides are plated. generally the areas with castellations are fully routed for the plating process. but in this case the best answer will come from the manufacturer.

author: Richard Crowley
author_rank: Super Contributor
timestamp: January 27, 2019, 07:26:24 am
content: The proper term is "castellated holes".Some PCB manufacturers offer the feature, but you can also "DIY" after they are made.My impression is that the extra cost may be prohibitive for small hobby quantities(?)https://prototypepcb.com/castellated-holes/

author: mvs
author_rank: Frequent Contributor
timestamp: January 27, 2019, 11:45:06 am
content: Quote from: Srijal97 on January 27, 2019, 07:04:56 amWhat you call break marks are V-score lines. Usually you need to draw them as lines in board outline layer.Castellated holes can be done either with milling or with V-scoring as shown in your sketch. Ask your manufacturer what is prefered method is.Plated holes and copper pads are just basic THT pads, nothing special. You may add a via in this pad to increase mechanical stability.

author: Srijal97
author_rank: Contributor
timestamp: January 27, 2019, 01:10:27 pm
content: Yes, thank you! These are exactly what I wanted. I'll contact some manufacturers and inquire about the cost and how it could be done...if it gets expensive, I think I can work around a normal board.

author: Ribster
author_rank: Frequent Contributor
timestamp: January 27, 2019, 02:26:51 pm
content: Quick tip:If you design your own panel, you can make sure to specify the routing outline.So if you make a seperate layer for the milling of the outline, you make it go through the holes.You will get DRC failures because the spacing will not be met, but the milling layer in gerbers is mostly arbitrary, so the gerber processing person normally should know what to do.You can always add extra text to your gerbers, specifying what you want / need on the milling layer.
PCB Prepreg Thickness - Page 1
Forum section: electronics / projects

author: Glenn0010
author_rank: Regular Contributor
timestamp: January 31, 2023, 04:56:10 pm
content: Hi,I’m looking at 4 layer PCB design. I’m going to have a 400 V signal between layers 1 and 2. This signal is going to be swinging between 400 V and 0V at 100 kHz. As shown belowI was wondering if anyone could recommend a layer stack up to help avoid the prepreg breaking downI know that the breakdown voltage of the prepreg is 30-40 kV/mm however this is not the only parameter to consider. I’m also worried about the switching frequency and the fast switching edges as I'm switching a square wave. As far as I know this will "derate" the distanceI only have a small copper area (~10 mm by 5 mm) that is actually this switching node as seen in the image below the read area marked by yellow dot however I'm assuming this still needs to be taken into account as I don't want the prepreg breaking down.I want the distance to be as small as possible to reduce the inductance between the 2 layers but at the same time I want it to be enough as to not breakdown the materialCould you help with recommending a layer stack up or a minimum distance between layers 1 and 2?Best Regards,Glenn

author: thm_w
author_rank: Super Contributor
timestamp: February 01, 2023, 12:54:01 am
content: https://www.magazines007.com/pdf/High-Voltage-PCDesign.pdfhttps://ewh.ieee.org/r10/taiwan/pses/archive/2012_04_27/IEEE%20PSES%20April/TC108%20hf_FC_v.1.2_IEEE%20PSES%20TAI.pdfIf you needed to notch out some of the copper below the node on the 2nd layer, I'm not really seeing that being a big deal at 100kHz.But it may not even be necessary at the standard 0.2mm prepreg.Don't try to make it super thin just to "reduce the inductance" unless you have a specific impedance target you are trying to hit, and that is required for it.

author: Glenn0010
author_rank: Regular Contributor
timestamp: February 01, 2023, 02:41:04 pm
content: Cheers thm_w, I think slotting layer 2 as you suggested might be the best way to go
PCB Project - Jellybean boards design - Page 1
Forum section: electronics / projects

author: glentek
author_rank: Regular Contributor
timestamp: June 15, 2020, 12:15:08 am
content: Given the low cost of boards from such as JLCPCB, I decided to design some jellybean boards. Simple functional circuits like voltage amplifiers, comparator, power supplies etc. Have a look at my schematic and see what you think. I have space for one more board. Most are about 30 x 18, some a bit bigger. The design is one file, boards can be cut apart with a hacksaw. Not going for routing or v groove to save cost.

author: MarkF
author_rank: Super Contributor
timestamp: June 15, 2020, 04:30:43 am
content: Your PCB house is going to see that as eight different designs and charge accordingly.You will want to break each one into its own PCB and then panelize it.

author: spudboy488
author_rank: Regular Contributor
timestamp: June 15, 2020, 11:56:04 am
content: Quote from: MarkF on June 15, 2020, 04:30:43 amThis is something I've always wondered about. Unless you were submitting multiple gerbers and asking the board house to panelize them, why would they care about how many designs are on a single gerber set. OP will even be doing their own cutting so the board house doesn't have to do anything extra.

author: sleemanj
author_rank: Super Contributor
timestamp: June 15, 2020, 01:52:26 pm
content: Quote from: spudboy488 on June 15, 2020, 11:56:04 amMoney principally I expect, or rather less of it. They make money on volume with these crazy low prices, an individual order makes them pennies - allowing phoney-panels like that serves only to reduce volume (or conversely, not allowing increases volume)

author: Dave
author_rank: Super Contributor
timestamp: June 15, 2020, 01:59:11 pm
content: Quote from: sleemanj on June 15, 2020, 01:52:26 pmJLC don't seem to mind it(3rd paragraph on the page). Other fabs might, so it's best to read the FAQs before ordering.

author: glentek
author_rank: Regular Contributor
timestamp: June 16, 2020, 01:17:43 am
content: Quote from: MarkF on June 15, 2020, 04:30:43 amI've done this a number of times with JLCPCB and not had a problem. The component references are not repeated - which doesn't bother me.
PCB protection/case - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: September 22, 2020, 12:40:25 am
content: Has anyone around here used plastic plates to protect a pcb? It seems like I've seen projects do something like this from time to time. Instead of trying to get a whole case, it looks like a one or more plates added together to form a case of sorts. Maybe even just a top plastic plate and a bottom one. Are there places that manufacture them cheaply like pcb's?

author: coppercone2
author_rank: Super Contributor
timestamp: September 22, 2020, 02:40:39 am
content: you can get them designed and manufactured, they are good in equipment to prevent stuff from blowing up incase a screw driver bit falls down on a PCB

author: fourfathom
author_rank: Super Contributor
timestamp: September 22, 2020, 03:07:09 am
content: Quote from: alank2 on September 22, 2020, 12:40:25 amPeople also use PCB material in this way, often using the same fab house that makes the circuit board. Look at the NanoVNA to see an example.

author: DaJMasta
author_rank: Super Contributor
timestamp: September 22, 2020, 06:47:23 am
content: Something like laser cut acrylic looks particularly nice if you want to see the board, but 3d printing a more form fitting case is also a really nice option for low volume production/one offs. Requires some CAD design, but there are free tools that are good if you can spend the time to learn them a bit.For cases though, there's always the option of finding a case and fitting your project to it. Harder to do after the fact, but especially before this sort of on-demand prototyping of case bits was easy, that was definitely the simplest option.

author: alank2
author_rank: Super Contributor
timestamp: September 22, 2020, 01:00:46 pm
content: I think it is laser cut acrylic I was thinking about; just didn't know what to call it.

author: phil from seattle
author_rank: Super Contributor
timestamp: September 22, 2020, 07:31:59 pm
content: You can cut acrylic (or polycarbonate) on a CNC router/mill with excellent results. Opaque colored arcylic is available for a wide range of options. Also, a CNC mill can pocket and bevel for some unique forms. I have RasPi 4 case that is made up of stacked acrylic layers and it is quite nice.While 3D printing is great, I have one and use it but IMO it still looks 3D printed which in many circumstances detracts from a professional look.And, the best, easiest and cheapest (especially when you factor your time) option is usually selecting your case before you make the board - then design the PCB to fit the case. There are a lot of really nice cases out there with some great features for relatively small $$.

author: alank2
author_rank: Super Contributor
timestamp: September 23, 2020, 03:41:08 pm
content: Thanks everyone for the ideas!
pcb resistors - Page 1
Forum section: electronics / projects

author: trevwhite
author_rank: Frequent Contributor
timestamp: July 13, 2012, 08:49:17 am
content: Hi, as any one used a pcb track as a current sense resistor? I found a current sensor ic that recommended a track pattern that gave 150mOhm resistance with 5% tolerance. I believe the tolerance was for manufacturing rather than temperature changes.I was wondering if such 'pcb resistors' remain within tolerance w.r.t. temperature?ThanksTrev

author: PChi
author_rank: Frequent Contributor
timestamp: July 13, 2012, 09:49:06 am
content: I have worked on product that used tinned copper wire not the PC track. It's a cheap idea. The temperature coefficient of change of resistance with temperature for copper is high. The data that I have is alpha = 0.00428 which I think means that it changes by 0.4% / degree. Also over load trashes the track hence the PCB.

author: Psi
author_rank: Super Contributor
timestamp: July 13, 2012, 09:56:32 am
content: You can also get hall effect current IC's where you have a PCB trace running under the chip and the sensor inside picks up the current through the IC package. I don't think the track width matters much with those.It's not very accurate though.

author: trevwhite
author_rank: Frequent Contributor
timestamp: July 13, 2012, 09:58:30 am
content: HiThanks for the reply. It doesn't sound the best idea really. Maybe for detecting some current it would be okay.Trev

author: Psi
author_rank: Super Contributor
timestamp: July 13, 2012, 10:11:20 am
content: Yeah, it's no good if you need accuracy.

author: ejeffrey
author_rank: Super Contributor
timestamp: July 13, 2012, 02:14:33 pm
content: Track resistors can be useful for things like current sharing resistors but they aren't very good for measurement shunts unless you really don't care about accuracy.

author: Zero999
author_rank: Super Contributor
timestamp: July 15, 2012, 12:45:53 am
content: I agree, it's no good for accuracy but the question is why are you measuring the current in the first place?Is it for overload protection? If so, a PCB trace may be ideal, as copper has a positive temperature coefficient so the reading will increase with the temperature, which might be good if the sense trace is near the device being protected.
PCB Review: Custom 40 NeoPixel board - Page 1
Forum section: electronics / projects

author: Coasterghost
author_rank: Newbie
timestamp: March 07, 2022, 06:24:26 pm
content: Hey,I've been as of the last year after been introduced to Neopixels (Individually addressable LEDs), liking them very much. I started to work on a project with them and found that for what I want to do, I would need to make my own custom PCB. So, after years of doing hardware repairs, it was tine to dip my foot into the realm of PCB Design. That all being said, I based my design of the Adafruit NeoPixel PCBs to get a rough idea of how I would want to approach the design.I'm just looking to see if there is anything you think I could change for these boards if needed. I wanted to be diligent on what if's so I spent a far bit of time preparing for the worst case scenario of a possible max current. A few things for it, I did design it for a custom 3D print enclosure where it would spend it's time. As the PCB suggests, it would have 40 leds. I did design it for both WS2812B and SK6812 so I wanted to be very considerate for power so I wanted to plan for anything too crazy. I wanted to make sure that if I went with SK6812s that there was enough for a hypothetical all diodes on (three rgb and white).Considering that I will be putting it into a 3D printed custom enclosure, I wanted to ensure thermal considerations. I have considered the thermal management with the drive voltage of 5V and at the worst case scenario using SK6812s, of 100mA per LED (all Diodes active; but this is extremely unlikely). The highest realistic load would be 60mA-80mA per LED (RGB Diodes active; each color channel uses 20mA and the white channel uses 40mA).Some Design notes:This is a 2-Layer board. The bottom later is entirely a ground plane. The boards dimensions are 90mm by 90mm. The thinnest part of the power plane is 3.6mm. I also ran it through FreeDFM which found "no show stoppers"Some changes I might make:I might add a few more vias for Ground and another ground connection point. The resistor value might change but is currently expected to not go beyond 300 and 500 ohmPlease let me know what you think of this, and I can post the Gerber or Eagle files if requested.I thank you for your time.

author: Renate
author_rank: Super Contributor
timestamp: March 09, 2022, 07:21:01 pm
content: Me? I'd rather do it with 37 LEDs
PCB review for ADC Eth first STM32 board (follow) - Page 1
Forum section: electronics / projects

author: matb
author_rank: Regular Contributor
timestamp: September 15, 2025, 08:18:19 am
content: Hi, first of all thank you to the members who helped me with the schematic part of my first STM design.This topic is linked tohttps://www.eevblog.com/forum/projects/schematic-review-for-adc-eth-first-stm32-board/, my previous post but all the datas will be reposted here as they changed a little.Now I did the pcb traces and I was wondering if kind members could check it out to see if there are weird things going on ?For reminder :The board will be used in industrial sensors (2mV/V output sensors) and will contain 1 ADC and 1 Ethernet connection (Modbus TCP, etc).12/24V DC is the expected power input.2 LDOs are used : one for 3.3V (MCU PHY) the other for 5V (adc side)I will be using JLCPCB for assembly.
PCB review request - Altium - Page 1
Forum section: electronics / projects

author: Inappropriate name removed by admin
author_rank: Newbie
timestamp: November 26, 2024, 04:12:21 pm
content: Looking for feedbacks on this project ive been working on, so roast me all u can on design, component placement and routing that i need to improve

author: Inappropriate name removed by admin
author_rank: Newbie
timestamp: November 26, 2024, 04:14:52 pm
content: Heres the image

author: Slh
author_rank: Regular Contributor
timestamp: November 26, 2024, 05:11:12 pm
content: If you want the best feedback, I recommend giving a description of the project (what is it? What do you expect it to do? Etc).

author: gnif
author_rank: Unknown
timestamp: November 26, 2024, 07:02:41 pm
content: Locked, duplicate posting here is not permitted.https://www.eevblog.com/forum/altium/pcb-review-request-esp32-wroom-32/msg5727615/#msg5727615