hybridfree/eevblog-posts huggingface dataset:
2 Different Supply Voltages on PCB - Page 1
Forum section: electronics / general

author: jones12
author_rank: Newbie
timestamp: April 23, 2018, 12:24:57 am
content: Hey guys,Im designing a simple PCB with an ATmega328P to switch some fans on and off through a MOSFET.I need 5v for the IC and 12V for the fans, not huge power from rough calculations about 1A on the 12V side and roughly 1A on the 5V side.I was planning on using a 12V SMPS into a 7805, and tapping off the 12V incoming but I've been told that's not a good idea as it will get too hot.What are my other options? Hoping to keep this as compact as possible.Cheers guys!

author: killcode
author_rank: Contributor
timestamp: April 23, 2018, 04:15:47 am
content: First of all, how sure are you that you need 1A on the 5v rail? That's unlikely if its only powering the micro and a few leds etc.If you do need 1A at 5v (note that is 5W) you will have the 7805 burning 7W! as waste heat (12-5*1A) = big heatsink.In that case you should use a switching regulator - something like a LM2577/LM2673 or any of integrated switch regs. That can be squeezed into about 25x30mm (plus heatsink).Can you tell us exactly what is powered off the 5v rail (atmega,...,...) ?

author: jones12
author_rank: Newbie
timestamp: April 23, 2018, 10:18:01 am
content: Thanks Killcode, Yeah the 1A is a generous calculation.5V rail powering ATmega328P at 16MHz, 16x2 LCD (approximately 300mA from the datasheet), couple of 3mm LED's(36mA), DHT 11 Sensor(1mA) and supplying the gate for a IRF 540N.I think I read the ATmega power consumption wrong this morningShould I still use a switching Reg?LCD Datasheet:https://www.engineersgarage.com/sites/default/files/LCD%2016x2.pdf)

author: Rerouter
author_rank: Super Contributor
timestamp: April 23, 2018, 10:29:56 am
content: Not the cheapest option, But i have been running these in one the worst electrical environment out there without issue (council buses that are regularly jump started and face load dumps)I used the C series, but you should get by fine with the E SeriesC Serieshttps://www.recom-power.com/pdf/Innoline/R-78Cxx-1.0.pdfE Serieshttps://www.recom-power.com/pdf/Innoline/R-78Exx-1.0.pdfDepending on your supplier, there about $5 a pop for the E series.

author: jones12
author_rank: Newbie
timestamp: April 23, 2018, 02:20:57 pm
content: This looks like exactly what I am after!Cheers!
Gerber files RS-274 to RS-274X conversion (ESR/C meter no 9/2005 Elektor) - Page 1
Forum section: electronics / general

author: voltamper
author_rank: Newbie
timestamp: April 17, 2018, 10:57:02 am
content: Can anyone help me convert files from the RS-274 gerber format to the RS-274X format. I would like to make a pcb ESR / C meter Elektor 9/2005, but the file format I downloaded fromhttps://www.elektormagazine.com/files/magazine/2005/dolo/040259-11.zip.is not understandable for pcb manufacturers: jlcpcb, allpcb.RegardsChristopherPOLAND

author: mdijkens
author_rank: Regular Contributor
timestamp: April 17, 2018, 01:26:47 pm
content: Doesn'twww.gerbview.comdo that?

author: voltamper
author_rank: Newbie
timestamp: April 18, 2018, 10:50:19 am
content: 1.) Gerbview2.) Sprint Layout Editor3. Success !!!Thxmdijkens
Cool Modern EDA :) - Page 1
Forum section: electronics / general

author: f4eru
author_rank: Super Contributor
timestamp: April 16, 2018, 09:19:17 pm
content: Hey, I just stumbled across that EDA dinausaur:How cool was that ?Layout was not shown

author: JPortici
author_rank: Super Contributor
timestamp: April 16, 2018, 10:20:53 pm
content: wow.especially love all the sounds of impending doom when mistakes were made
Altium 14 and multiple file schematic - Page 1
Forum section: electronics / general

author: IconicPCB
author_rank: Super Contributor
timestamp: May 31, 2018, 04:29:09 am
content: I have had cause to reverse engineer a multilayer board ( 5 layers executed as loosely bonded layers mylar like copper clad material soldered onto pins penetrating a rigid backing board).The pins are tail ends of receptacles sockets of spade connector receptacles which carry automotive relays/power distribution board designed not to shake apart in a high performance vehicle.The board is no longer available through the usual channels ( vintage mid eighties) and had to be reverse engineered.Over the time due to vibratio and moisture it has failed fatigued and burned internally as the aging and burden increased.Having been able to take it apart layer by layer I have been able to transcribe the connections into five separate PCB projects in Altium14.I now need to bring it all together into one project in order to be able to cross check and prepare gerber files..How to do this?

author: IconicPCB
author_rank: Super Contributor
timestamp: May 31, 2018, 11:20:20 am
content: Bluskul,Thank You. I shall give it a go over the next day or two.
Documenting your designs - Page 1
Forum section: electronics / general

author: Mr. Scram
author_rank: Super Contributor
timestamp: April 11, 2018, 07:17:30 pm
content: During a design you trawl through datasheets and application notes and dutifully implement the advice given there. Sometimes you tweak items after testing. However, when revisiting a design months or even years later, it might not be that evident why you made a certain choice back then.I can hardly imagine this being a unique problem, so I was wondering how you deal with this. I'm using KiCad and I don't think it allows me to add notes to parts. I can have a separate document, updating the drawing there every time I change something but that takes a lot of work and is also error prone. I don't like the second guessing myself this causes and it also allows errors to remain undetected much more easily. There surely must be better solutions?

author: pelule
author_rank: Frequent Contributor
timestamp: April 11, 2018, 07:26:04 pm
content: I have on text file all time open during development work - and shortly note any step./PeLuLe

author: SimonR
author_rank: Regular Contributor
timestamp: April 13, 2018, 01:16:07 pm
content: This is a really good point.How often have you seen a note on a schematic that says 'Do not fit Manufacturer X' but the reason why you shouldn't has been lost in the mists of time because the only document left is the schematic.I'm sure every engineer has their own way of doing this because there isn't really a standard as far as I'm aware. Its probably all company procedures and small companies being what they are usually don't require it.The way I did it was to add custom fields to the component parameters in the job itself. But then the tool I was using at the time allowed me to make that kind of local change. I could then display the note on the schematic (and it would move with the schematic)Its probably not good to do big notes this way but then you can always just refer to a bigger note done in plain text on the last page of the schematic.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 14, 2018, 02:06:09 am
content: Use something like svn. This creates a much better filesystem paradigm: a unique file name that you update with commits that include comments.Use that text file to type in your steps, and have that text added to each version of the file you commit.SVN can then let you see the entire evolution of the file with the comments over time.

author: nctnico
author_rank: Super Contributor
timestamp: April 15, 2018, 04:11:24 pm
content: I create a Word document which has a block diagram and the most important calculations. Besides that I often put notes with calculations and descriptions in a schematic. Pretty similar to adding comments to code.
Altium Schematic to PDF (component display names mixing up) ? - Page 1
Forum section: electronics / general

author: Sidabros
author_rank: Newbie
timestamp: January 08, 2018, 11:42:11 am
content: Greetings,I have an interesting problem that I can not solve. Display names appear normal in schematic design but overlapping when transferred to PDF.Both Altium library component and my Custom library component that I have made appear strangely when it is transferred to PDF.Does anybody know how to overcome this issue ?Best Regards.

author: Chris56000
author_rank: Frequent Contributor
timestamp: January 11, 2018, 08:05:49 pm
content: Hi!This is a common and annoying bug in Altium I've seen myself - have you tried using a freeware PDF distiller like PDF995 or CutePDF, both of which install as an extra Printing Device, then using the native "Print" option with one of the PDF printers selected?Chris Williams

author: Sidabros
author_rank: Newbie
timestamp: January 12, 2018, 07:47:20 am
content: Hey!Thank you for your response! I will try and share the outcomes of your suggestions later in the afternoon !Murat.

author: kristjanbp
author_rank: Newbie
timestamp: April 03, 2018, 03:41:14 pm
content: Hi there.Did you have any luck? I'm having the same problem and using the method suggsted above is not working.
Looking for solution for adding a variable-length ext. antenna to data logger - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: April 02, 2018, 06:50:41 pm
content: Hi all,We're designing a data logger for which we need to add an external WiFi antenna.Originally, we planned to simply make a small antenna that would go out of the aluminium enclosure end plate.However, some customers wish to be able to move the antenna e.g. up to 1 meter away from the logger - to allow it to go outside WiFi shielding areas.For that we would need something a bit more creative - like an antenna that would be extendable.We're thinking something that could be on a wire that could be rolled up (for compact cases) and extended when needed. Almost like in a vacuum cleaner.Does anyone here have experience with this, seen an example of know of components that would allow this?Thank you,Martin

author: Gribo
author_rank: Frequent Contributor
timestamp: April 02, 2018, 07:57:06 pm
content: RP SMA Connector + Suitable LMR195 cable?
GROUND VIA? - Page 1
Forum section: electronics / general

author: lawrence11
author_rank: Frequent Contributor
timestamp: April 17, 2018, 06:37:15 am
content: I know that ground via should be used if there is space but I wonder if they can be shared?I was under the impression that return current actually goes on surface.http://slideplayer.com/slide/4662087/

author: ar__systems
author_rank: Frequent Contributor
timestamp: April 17, 2018, 02:26:19 pm
content: A respectable book on high speed design that I have suggests not to share vias to ground for the purpose of lower impedance. If space is limited, then you have to compromise...
LTspice XVII disabling waveform "drag" with Ctrl depressed? - Page 1
Forum section: electronics / general

author: KhronX
author_rank: Frequent Contributor
timestamp: March 21, 2018, 12:07:42 pm
content: I went ahead and installed the latest LTspice ("XVII") last night. For the most part, it looks and feels pretty much as the IV version.One very irritating "feature" i've stumbled across, though, is that whenever the waveform plot window is highlighted, my mouse cursor is within its confines and i press down Ctrl (in preparation to click on the name of a waveform to have it measured), it drags the plots alongThen after i notice that, i have to let go of Ctrl and wait for the waveforms to get re-drawn, then re-zoom, then place the mouse cursor on the waveform name before pressing Ctrl then clicking on it.The older version doesn't behave like that. Anyone have any idea if and how this can be disabled?

author: PCB.Wiz
author_rank: Super Contributor
timestamp: March 23, 2018, 08:34:12 pm
content: After Zoom-to-fit, CTRL-Mouse seems to be live, but if I click on any node name, that seems to then disable ctrl ?

author: KhronX
author_rank: Frequent Contributor
timestamp: March 23, 2018, 08:44:24 pm
content: That's a good catch actually, i can confirm that. Still not what i'd call "normal", though.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 24, 2018, 06:49:15 pm
content: Quite frankly, I've found the Waveform viewer of LTSpice XVII a huge regression compared to LTSpice IV, without any significant new feature. It's riddled with nasty bugs.

author: KhronX
author_rank: Frequent Contributor
timestamp: March 24, 2018, 06:53:35 pm
content: So it's not just me, then...
PCB Manufacture and - Ooops, STOP I need to change something. - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: March 01, 2018, 10:16:46 pm
content: What are you guys experience with last minute changes and the likes of PCBWay?I used the chat box on the pcbway website to stop an order after about an hour when it was already showing in production. They said to email the updated gerbers. I have. I'm wondering how long it will take and how I can tell they have recieved and released the order.I have tried googling, but found nothing useful.Has anyone experience of this with PCBWay or others? Will they email me confirmation new gerbers? Should I wait a few days and see if the progress moves on the order? Should I hit them on the chat box again tomorrow?

author: paulca
author_rank: Super Contributor
timestamp: March 02, 2018, 07:44:14 am
content: So PCBWay answered the email that they will not proceed with the production

author: JohnPen
author_rank: Regular Contributor
timestamp: March 02, 2018, 11:01:04 am
content: I had a slightly similar experience with Elecrow in that I hadn't included the drill file with the gerbers. In my case they sent me an email to let me know and requested a revised gerber set. In the meantime I had noticed a minor error in my design so I sent them the updated gerber set this time including the drill file. The resulting PCB followed the later gerbers. It would seem that they have a good checking procedure before starting manufacture and that it does give a window of opportunity to cancel. I am sure PCBWay and other Chinese PCB makers have similar processes and that last minute changes are not that unusual to them.

author: westfw
author_rank: Super Contributor
timestamp: March 25, 2018, 10:07:18 am
content: I screwed up an order at pcbway (it was two,separate board types, but only one made it through the upload process completely.). but I noticed by the end of the weekend, fixed the second board, and it offered to combine shipping with the board that had gotten further, which I thought was pretty impressive.
Eagle wont let me put vias down while routing a 4 layer board - Page 1
Forum section: electronics / general

author: ocset
author_rank: Super Contributor
timestamp: March 21, 2018, 11:43:50 am
content: i have a 4 layer pcb that i am routing up.It has layers (1*2)+(15*16).When i route on the top and then select the bottom lyaer (16), it gives error "cant set via at -40,30 to layer 16".It wont let me put vias down.Do you know why?

author: Jeroen3
author_rank: Super Contributor
timestamp: March 21, 2018, 11:47:01 am
content: Your layer setup does not allow vias from top to bottom.You need (1+2*3+16) for that.Your setup (1*2)+(15*16):Correct setup (1+2*3+16) without blind vias.Check eurocircuit drc rules. (attached)

author: ocset
author_rank: Super Contributor
timestamp: March 21, 2018, 11:52:06 am
content: Thankyou, you are the Best!
interface with qsapecng - Page 1
Forum section: electronics / general

author: promach
author_rank: Frequent Contributor
timestamp: March 12, 2018, 04:29:26 pm
content: is there a way to interface gschem schematics withhttp://qsapecng.sourceforge.net/howto.html?

author: ScribblesOnNapkins
author_rank: Regular Contributor
timestamp: March 21, 2018, 03:31:07 am
content: Sorry looks like you will have to ask their developers about it.
How to buy "non-consumer" version of Toshiba FlashAir SD cards? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: March 19, 2018, 10:26:51 pm
content: Hi there,We're today using Toshiba's FlashAir W-04 as part of our product - and we purchase them at 200+ units batches.Today, this is extremely inconvenient as the batches come as consumer products incl. tons of packaging and outdated firmware.Any of you happen to know of a way to purchase such batches the "B2B" way? Do I go via Toshiba (they're hard to get a response from) or are there distributors that carry B2B versions of their products that you know?Thanks a ton,Martin

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 19, 2018, 11:02:30 pm
content: Toshiba may have a distributor more focussed on B2B sales - problem is probably finding the right part of Toshiba to talk to, and what the MOQ might be.There appears to be a developer site with forum so that might be a start if you've not tried already :https://www.flashair-developers.com
Adding new transistor model to LTSpice - Page 1
Forum section: electronics / general

author: NDani
author_rank: Contributor
timestamp: March 16, 2018, 12:16:53 pm
content: Dear Forum members,I have seen some instructions about how to extend the library of transistor models in LTSpice, e.g.:https://www.electro-tech-online.com/threads/adding-new-transistors-to-ltspice.125232/(Comment #2) orhttp://www.home.hs-karlsruhe.de/~klal0001/download_frei/Externe%20Spice-Modelle%20in%20LTspice%20einbinden.pdf(German).They both say that one can open the library of built-in transistors ("C:\Program Files\LTC\C:\Program Files\LTC\LTspiceXVII\lib\cmp\standard.bjt") and paste the .model definition to it. After saving the file, one should see the new transistor model in the list that appears when one right clicks a transistor on the schematic in LTSpic and clicks "Pick New Transistor".I have tried this method, but the new transistor does not appear in the list. In fact, any changes made to the standard.bjt file seems to be ignored by LTSpice. I can even delete the file or the whole cmp folder, it will have no effect (i.e. the default transistor list appears in LTSPice), neither after restarting LTSpice nor after restarting the computer.I am using LTSPice XVII.Can you help me finding out what causes this behavior? Do you think the method I was trying to use should work?Thank you in advance.

author: Macbeth
author_rank: Super Contributor
timestamp: March 16, 2018, 10:05:46 pm
content: Quote from: NDani on March 16, 2018, 12:16:53 pmSome redundancy there - I think you meanC:\Program Files\LTC\LTspiceXVII\lib\cmp\standard.bjthowever you may find LTspice is actually using%USERPROFILE%\Documents\LTSpiceXVII\lib\cmp\standard.bjtThere is also a config file (but the registry may also be used) over at%APPDATA%\LTspiceXVII.ini

author: NDani
author_rank: Contributor
timestamp: March 18, 2018, 09:43:17 am
content: Yes, sorry, I made a mistake while pasting the path here, but you got the point.And yes, indeed, modifying the file in the alternative folder you gave solved it. Thank you!
"X-Ray" or "See-Through" view of PCB - making them from separate drawn layouts? - Page 1
Forum section: electronics / general

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 17, 2018, 01:01:46 pm
content: Hi!Another Member is having problems with a UTG9005C Function Generator:-https://www.eevblog.com/forum/repair/uni-t-utg9005c-function-generator-amplitudevoltage-display-dead/msg1389532/#msg1389532The OP posted the PCB drawings, which I attach to this post but I can't find the actual schematics anywhere!Can anyone point me in the direction of a good tutorial that will enable me to put the copper-side and component-side views of each PCB -"on top" of each other, with the copper-side artwork made a light colour, i.e., a "see-through" view of the PCB shown from the top side like you get in Service Manuals & Constructor's Magazines?I once saw an "Instructable" that showed how to do this but I can't seem to find it now!If I can do that I can then draught a set of schematics and help the original chappie who's having trouble with his unit!Chris Williams

author: rhb
author_rank: Super Contributor
timestamp: March 17, 2018, 01:19:47 pm
content: I can't point to specific instructions, but Gimp should be able to do that. Be aware that Postscript/PDF writes layers and the visibility is granted the last layer drawn unless you take steps to mitigate that property. Half toning the underside and drawing it last is probably the easiest solution.
Anyone heard of Empyrean? - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: March 15, 2018, 02:12:02 am
content: I was recently looking for building a startup with IC design capability, and I approached a few fabs. One of them (a Korean one which I don't want to reveal) told me that they support a low cost EDA software called Empyrean.I took a look into this software, and the feature set and testimonies are promising. It was used by iWatt and MPS to design some of their chips.I just approached Empyrean, but have not yet gotten a demo license, so I don't know how it looks. From a video I found online, the layout/schematic editors seem like fairly well made Virtuoso clones, but I don't know how well the algorithms are behind the scene.Has anyone used this tool or has any information about it?http://www.empyrean.com.cn/_english/
Colored FR4/G10? - Page 1
Forum section: electronics / general

author: westfw
author_rank: Super Contributor
timestamp: April 04, 2018, 08:35:35 am
content: Do any of the prototype-friendly board houses have colored FR4 material? (not silkscreen - I'm looking for colorants in the actual fiberglass substrate.)

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 04, 2018, 09:05:39 am
content: This has been discussed before. TL;DR It's possible but is a special order with MOQ and leadtime from the laminate manufacturer. Certainly not prototype friendly.https://www.eevblog.com/forum/manufacture/which-pcb-manufacturer-has-a-white-fr4-plate/msg1394676/#msg1394676This company does non-copperclad coloured laminates if you can find a way to add copper...https://www.gaatech.com/fr4-g10-g9-gop3-sheet-laminates-epoxyglass-fibreglass/
creepage distance on eBay items - Mains water level sensor - Page 1
Forum section: electronics / general

author: phaseform
author_rank: Regular Contributor
timestamp: March 12, 2018, 05:00:37 am
content: Thisitem spotted on eBay is amazingly dangerous..

author: Wilksey
author_rank: Super Contributor
timestamp: March 12, 2018, 01:56:38 pm
content: Oh I don't know, they've left a decent spark gap between L + N, and the colours of the wires are fine, in fact, you should use black wires for everything, that way, you won't get confused by the different wire colours.Where is the danger? No fuse?
Tanner EDA -- any good? - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: March 02, 2018, 08:57:50 am
content: The title says it all. I was recently given an acceptable quote on Tanner, as I want to get my hands dirty on IC design. Since I believe the price is not open, I will not give the exact number. It's between $10k and $20k, including schematic capture, simulation, Verilog-A and layout editor. There's no digital/AMS stuff included, nor LVS or other verification tools.So far, I've painfully used ElectricVLSI+Yosys+ABC, and I probably will still use this suite for small scale digital design, but the lack of simulation capability makes me crazy, especially for analog designs. As we know, many PDKs are using PSpice model or HSpice model, which can't be read by LTSpice and NGSpice, so I can't run simulations with PDK models.Most of my planned designs are pure analog or power with little digital that can either be laid out by hand, or can be generated with Electric+Yosys+ABC and being exported as GDSII macro block. I don't do fancy 2-digit-nm digital designs. Most of the so called digital parts are SERDES, 8b/10b, SPI, I2C and similar communication stuff plus some simple logic.Tanner T-Spice claims to read PSpice models and HSpice models, and it seems many legacy processes (180/250/350/500/700) are available in native Tanner PDK format, so that makes my life a little bit easier.I want to ask for your opinion -- is Tanner any good? Is there any other options for entry level analog-dominant IC design?
PADS Maker Pro - Page 1
Forum section: electronics / general

author: jpotter0
author_rank: Newbie
timestamp: February 18, 2018, 02:32:05 am
content: What's the latest information on DigKey's PADS Maker Pro. All the information I see dates back to May 2017. There were lots of skeptics then. Are there any new opinions about the usefulness of this product? Thanks - jim

author: PCB.Wiz
author_rank: Super Contributor
timestamp: March 02, 2018, 04:30:19 am
content: QuoteThe lack of replies gives one indication.Digikey has just donated to KiCad, and is releasing a KiCad parts library, seehttps://www.eevblog.com/forum/kicad/digi-key-open-sources-alpha-version-of-an-atomic-parts-library/So given PADS Maker Pro, was a crippled version of PADS, with no ASCII recovery paths, no scripts, closed binary files, and poor migration, I'd guess it's close to a dead duck now.The newest KiCad has better Eagle import, so that's another EDA vendor who will be wondering if they made the right calls....
problem with lvs in cadence layout using calibre - Page 1
Forum section: electronics / general

author: salar_1991
author_rank: Newbie
timestamp: March 10, 2018, 09:01:41 pm
content: hi i'm testing the layout for my circuit using cadence calibre tool that is a transimpedance amplifier and im using cadence 6.14. drc test is ok but i encountered some errors in lvs check . there is 16 errors including 1 port error which points to gnd and i couldn't fix it and i checked the layer of pin and lable problem is not from that . there are 4 incorrect instance errors that's pointing to 4 spiral inductor in the circuit and there are 11 net errors. can anyone help me ? thanks in advance .

author: endevor100
author_rank: Contributor
timestamp: March 11, 2018, 12:48:32 am
content: Typically in that situation I've found that you probably forgot to connect something. The DRC just looks to find basic problems that would cause issues (things too close together, traces from different nets that are connected, etc...). The LVS is what actually looks at you schematic and makes sure that you're faithfully recreated that in your layout. If you look at your Output button on the LVS window it will give you more detailed information on its analysis of your design. If there are no smoking guns there then I find it most useful to look at the extracted view where Cadence adds net numbers to all of the devices. If two points should be connected to the same net, but the net listed in the extracted view is different then you've found a problem and now you know at least the first thing to fix. I've seen plenty of occasions where 1 missing connection can cause dozens of LVS errors so don't get discouraged.
How do you combine designs with parts made in multiple pieces of ECAD? - Page 1
Forum section: electronics / general

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: April 03, 2018, 07:54:54 am
content: I'm working on a design in which we use different pieces of software.I want to use Altium for the more "general" PCB design part. The connections between components and such put into a schematic, and then I can use the usual flow for PCB design.But we have a milimeter wave structure that was designed in Ansys HFSS. How do I best import this into Altium? Or is it best for me to work with some other software to put it together? I could do it in HFSS but it is an absolute pain in the behind to do such a thing in HFSS, and it is far easier to make mistakes.Any good resources on this? most of what I find when I look this up is how to export designs from altium into HFSS for simulation in HFSS, but that is not what I need here (and can't, it would simply take too much memory, we are already pushing what we can do with our little 1 cm long structure).

author: Rerouter
author_rank: Super Contributor
timestamp: April 03, 2018, 08:09:07 am
content: can you move it through an intermediate format, e.g. kicad lets you export or import copper layers as a dxf file,

author: Araho
author_rank: Regular Contributor
timestamp: April 03, 2018, 02:07:05 pm
content: I'd probably try to export a DXF from HFSS - the DXF format was made for this exact purpose (Design eXchange Format), but I have no clue whether or not HFSS support it.Create a new component in Altium for your structure, where the copper elements are created from importing a DXF-file. Define the pins of your component, and add a pad in the copper structure for each pin, just like you'd do normally.
Numbering system for SCH/PCB - Page 1
Forum section: electronics / general

author: ivonenand
author_rank: Contributor
timestamp: February 19, 2018, 08:12:32 am
content: Hi Guys,ng this:I was wondering, what drawing numbering system you guys use for the schematics and PCBs? For instance, I looked at an Altera FPGA development board, and they seem to be using the system in the attachment. It seems that the first three numbers define the document type, then comes the project number and then the revision. Do you guys use a similar system, or something different/better?Ivo

author: Eternauta
author_rank: Contributor
timestamp: February 19, 2018, 02:14:48 pm
content: After try to adopt a "smart" numbering system I have adopted a very similar scheme as suggested in this document:http://www.componentsengineering.com/procedures-guidelines-2/numbering-guide-bom-tree/.The schema of Altera looks very similar and could be adopted for every Parts, included devices, document, firmware, tools etc

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 21, 2018, 11:46:05 am
content: I use something similar. My IDs are usually alphanumeric (not just numbers), which makes it easier to spot a given document with a human eye IMO, and I put the project ID first, then doc type, then a doc number (since you may have more than one document of a specific type in a project), then the revision.
Free HyperLynx DRC download - Page 1
Forum section: electronics / general

author: Gazza9
author_rank: Newbie
timestamp: February 14, 2018, 08:39:40 pm
content: Has anyone had chance to look at this free HyperLynx DRC product that can be used with AD/PADS etc....https://www.mentor.com/pcb/hyperlynx/electrical-rule-check/drc-editionsSupported PCB layout systems and formats include:• Mentor Graphics PADS®, Xpedition®, and Board Station®• Cadence Allegro®, SPECCTRA®, and OrCAD®• Zuken CADSTAR®, Visula®, CR-3000/5000/8000 PWS, and Board Designer• Altium® Designer• ODB++• IPC-2581

author: ScribblesOnNapkins
author_rank: Regular Contributor
timestamp: February 16, 2018, 08:24:55 pm
content: Thanks. I guess I could always double check my DRC output with this.

author: voltsandjolts
author_rank: Unknown
timestamp: February 16, 2018, 08:36:32 pm
content: Quote from: Gazza9 on February 14, 2018, 08:39:40 pmThat's the second time you've started a thread with that exact same blurb - please be aware that spamming is not appreciated here.https://www.eevblog.com/forum/altium/free-hyperlynx-drc/Do you have any affiliation with the aforementioned company?

author: Gazza9
author_rank: Newbie
timestamp: February 19, 2018, 04:03:04 pm
content: voltsandjolts..No affiliation, just trying to cover bases/different users with the same question.I'm always suspicious of "free"..

author: ScribblesOnNapkins
author_rank: Regular Contributor
timestamp: February 20, 2018, 02:55:25 pm
content: If you are suspicious of it then why are you promoting it?
ADS layout drawing - Page 1
Forum section: electronics / general

author: xzswq21
author_rank: Frequent Contributor
timestamp: February 11, 2018, 11:15:57 am
content: HelloI have designed a 7-th order low pass filter and I drew the schematic in ADS 2016 and simulated it. now I want to transfer it to layout to analysis the PCB layout.I have found some documents but I haven't been convinced yet :|from Schematic>Tools>Generate/update Layout>...How should I select 0603/0402 SMD packaged components?Thanks

author: xzswq21
author_rank: Frequent Contributor
timestamp: February 16, 2018, 06:47:02 pm
content: after some days I could draw the layout but I can't able to find my problem.I have sent you my project link, please check it and tell me what's my problemPleasehttp://s9.picofile.com/file/83195811...er1_7zads.htmlthe Library I have used:http://s8.picofile.com/file/83195811...2_v01.rar.htmlhttp://s8.picofile.com/file/83195812...brary.zip.htmlhttp://s8.picofile.com/file/83195812...17_10.zip.htmlplease draw a polygon on the top and buttom layers with 8 mils clearance. (bcoz I have removed the polygon)Thanks
What additional information do you include in your PCB/Gerber? - Page 1
Forum section: electronics / general

author: logictom
author_rank: Unknown
timestamp: February 23, 2018, 06:35:51 am
content: I am finally spending some time cleaning up our templates for schematics, BOMs and PCBs and I'm curious what additional information people include on their PCBs and ultimately Gerbers.We have a template that has our company name, address, a revision, project name, date, drawn by, as well as some things that are never used like drawing number (we don't have a system in place for these) which usually either stay default or are deleted before generating output for production. We also have a border, which I'm skeptical about it's usefulness but have left it in place.I'm curious what people include or have found useful in the past?

author: DerekG
author_rank: Frequent Contributor
timestamp: February 23, 2018, 10:56:46 am
content: Quote from: logictom on February 23, 2018, 06:35:51 amAdded to PCB Files:Either on the top component overlay or on the top or bottom copper layers:A/ PBC File Name including revision numberie XMO_v1B/ Date of the design when the Gerber files are being generatedie 23/02/2018C/ The copyright symbol to retain the ownership of the layoutie (C)D: Your Company Name or your Website URLAdded to Gerber Files:Absolutely NOTHING.If you want to point out slotted holes or gold fingers etc to the board shop, do this on one of your mechanical layers, generate the Gerber for the mechanical layer & when you place your order make special mention that the mechanical layer contains pcb board manufacturing instructions that must be adhered to.

author: mars01
author_rank: Contributor
timestamp: February 23, 2018, 09:18:15 pm
content: At work we add on Drill Drawing layer (Altium Designer) requirements from PCB manufacturer like:- for ENIG, gold thickness and minimum thickness for the low stress nickel under gold- material type: FRxxx with TG xxx- plating thickness, minimum PTH barrel thickness- what kind of soldermask to use: matte or transparent/glossy- information's about controlled impedance (when it's the case)- if non-functional copper thieving is allowed in open areas- if via holes need annular ring or tangency only- if they are allowed to add teardrops or notOn the PCB itself (Top Overlay) we add:- company logo- if it's ROHS compliant- part number and revision

author: logictom
author_rank: Unknown
timestamp: February 26, 2018, 01:48:03 am
content: Thanks guys, all useful stuff

author: KL27x
author_rank: Super Contributor
timestamp: March 02, 2018, 12:37:10 am
content: I write the rectangular dimensions of the pcb on a pcb layer, like top document. This is to fill out quote information.
SDRAM Layout for newbies - Page 1
Forum section: electronics / general

author: NivagSwerdna
author_rank: Super Contributor
timestamp: February 08, 2018, 02:17:16 pm
content: I am designing a simple expansion board for my FPGA dev kit which amongst other things has...A 256Mb SDRAM device AS4C16M16SA-6TCN which is TSOP-54 II package. I need to route these pins to a 2x20 pin connector.Now I realize 166MHz/5ns might not be considered high for some but I would like to make a reasonable effort of this...I am planning to...Try and keep traces roughly the same length (hard given the device and connector are likely to end up side by side) and keep the clock traces around median length.Is there anything else I should know? Any opinions on routing under the device versus going around?Any suggestions for reading on the subject appreciated.(I'm using DipTrace but that is probably inconsequential)Thanks in advance

author: stmdude
author_rank: Frequent Contributor
timestamp: February 08, 2018, 06:59:10 pm
content: I'm by no means an expert, but I have designed a few (working) boards with 166MHz SDRAM and an MCU.So, for my first board, the process went something like this:1. Figure out the wavelength of 166MHz2. Realize that it's close to six feet3. Laughed at myself for being worriedSeriously, I just kept the SDRAM close to the MCU, and kept all the traces as short as I could without needing any vias. (I.e, I "went around" instead of under)Everything is routed on one side of the PCB. I have a few vias, but they're for VDD and GND.As for reading recommendations, while it doesn't mention SDRAM at all, I'd wholeheartedly recommend Toradex Layout design guide since you're starting to approach high-speed stuff.It's free to download here:https://docs.toradex.com/102492-layout-design-guide.pdf

author: Bassman59
author_rank: Super Contributor
timestamp: February 08, 2018, 08:09:43 pm
content: Quote from: stmdude on February 08, 2018, 06:59:10 pmIt's not the frequency of the signal, it's its rise time that matters for signal integrity.

author: stmdude
author_rank: Frequent Contributor
timestamp: February 08, 2018, 08:28:05 pm
content: Quote from: Bassman59 on February 08, 2018, 08:09:43 pmTrue, but I'm pretty sure the frequency matters when it comes to length-matching. But, as I said, I'm no expert.
ExpressPCB - Page 1
Forum section: electronics / general

author: Wimberleytech
author_rank: Super Contributor
timestamp: January 25, 2018, 12:54:43 am
content: I have used ExpressPCB off and on for widgets and stuff for years. Simple, quick, and good quality.For a little over a year, I have been doing my own widget PCBs using toner transfer method. I have gotten pretty good at it but would never attempt anything large. And...I only do single sided. But, I use ExpressPCB software to do the layout and then print and FAB.Lately, I have started using Fritzing. Wow, what an amazing little tool with a shallow learning curve. I have also used the Aisler service to fab some PCBs. They are incredible quality and cheap. I just ordered three boards for $26. Silkscreen...solder mask...excellent quality.Anyway...back to ExpressPB--Today, I checked their website to see if there were any changes lately. Yes, they have ExpressPCB Plus. It is an upgrade of their layout software. I downloaded, installed. Yes it is an upgrade. Basically the same capabilities but a 21st century UI. But here is the interesting thing...If you order their miniboard service using Plus software, it costs $10 more ($51 versus $41). Really??I will probably still use ExpressPCB when I am in a hurry and need double sided. But the rest of my proto goes via Fritzing and Aisler.If I ever get to the point of needing some volume, I will try out one of vendors that have been listed/discussed on EEVblog--Fritzing will generate Gerber files.

author: Pack34
author_rank: Frequent Contributor
timestamp: February 01, 2018, 04:11:57 am
content: I used ExpressPCB right out of college, but at this point I have difficulty seeing the advantage.You can get boards made the same price or cheaper through iTead and can get boards in faster through Pentalogix.There may be extra steps even when using free tools like Eagle, Diptrace, etc but those extra steps are typically worth it in the long run.

author: scopeman
author_rank: Frequent Contributor
timestamp: February 07, 2018, 03:59:03 am
content: I'll bet that the output from their new version is not readable by the former "RobotRoom" CopperConnection which was 3rd party software that could read their files and output gerber files.Robot Room sold out their product a couple of years ago.Sam

author: Wimberleytech
author_rank: Super Contributor
timestamp: February 09, 2018, 08:17:40 pm
content: Quote from: scopeman on February 07, 2018, 03:59:03 amHad not heard of CopperConnection before. Went looking and the links led me to Expresspcb who bought it. The link says that it is compatible with Expresspcb classic. Therefore, you are probably correct!!
Software for finding components on layout - Page 1
Forum section: electronics / general

author: plazma
author_rank: Frequent Contributor
timestamp: January 31, 2018, 09:11:35 am
content: There was some software which could find components of a PCB photo. I could not find the thread out of my subscribed threads or by search.Anyone got a link or name?

author: plazma
author_rank: Frequent Contributor
timestamp: February 01, 2018, 02:18:43 pm
content: Found it. SmtAssistant Softwarehttp://www.alciom.com/en/downloads/free-downloads/123-smtassistant-software.html
Need to add KCC stamp for sale in Korea; Already have FCC/CE - how to? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: February 01, 2018, 08:45:29 am
content: Hi there,We're working with an electronics distributor in South Korea, who wants to sell our data logger.We selll a range of data loggers, some including WiFi. All loggers are certified for sale in US, EU, Canada (FCC, CE, IC) - and the wireless component is a FlashAir W-04 module that is certified for sale in all the markets incl. Korea.In other words, we do not expect to need further certification to be viable for sale in Korea - but from what we understand, we need to go through a legal process to be allowed to add the KCC stamp on our product.Do any of you know what this process looks like - and how we get started?Best,Martin

author: Gribo
author_rank: Frequent Contributor
timestamp: February 01, 2018, 03:16:08 pm
content: You will have to certify with the KCC. It might be relatively easy since you use a pre-certified module. Foreign certifications are not relevant when dealing with the KCC.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 01, 2018, 03:20:50 pm
content: Quote from: Gribo on February 01, 2018, 03:16:08 pmBut in general I'd expect test results from other certifications would be accepted if the test standards are comparable.
Differential trace impedance without reference plane - Page 1
Forum section: electronics / general

author: muruganmayil
author_rank: Newbie
timestamp: February 05, 2018, 03:56:22 pm
content: Hi There,We are designing a pass through PCB by routing the isolated RJ45 signals. Please refer the below image for reference.• • How to achieve differential trace impedance for isolated RJ45 signals in PCB? Even if it is 4layer since there should not be any ground/power plane under the differential pairs after magnetics.• • Can we give shield ground of RJ45 connector as reference plane for these differential traces to achieve 100ohm impedance for differential traces on the PCB? If so how can we achieve the 2KV isolation between differential pair and shield ground ?• • How can we achieve the differential impedance without reference plane and by using only trace width, separation and dielectric permittivity? Without using dielectric height (H) since no plane here.•

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 06, 2018, 05:14:57 am
content: I've tried looking for that before, seems to be scant information.http://www.hagtech.com/pdf/impedance.pdfThis has curves which may be useful. Doesn't look like the impedance goes low enough, which is a concern. A lower ratio may get there.The limiting case for trace width --> infty is a slot line,http://janielectronics.com/szamitasok/Transmission%20Line/Slot%20Line%20Calculator/janilab.phpdefined only by the gap between traces and the dielectric. (Obviously, for Ethernet which must use a TEM mode, the traces can't be infinitely wide, or returned to ground as in a slotted waveguide (finline); just assume that the impedance approaches this value for w >> h.)This may require inconveniently wide traces.The other option is parallel plate transmission line, which I can't find a damn thing on. The construction is simply placing the traces in the same locations, opposite layers. The problem is, every EE course uses this as an introduction to transmission lines, which yields only the very-wide limiting result. No one seems to explore the case with fringing fields.If nothing else, you can construct the geometry and simulate it with something like ATLC2.On a practical note, if the application is only 10/100Mb, that can literally run over coathangers. It's very tolerant to mismatch, and running traces that are good-enough will more than suffice, particularly if they are short. Traces of only a few cm or less will probably be fine at Gb too.Tim
Gerber X2 - Page 1
Forum section: electronics / general

author: djacobow
author_rank: Super Contributor
timestamp: January 25, 2018, 06:16:08 pm
content: So, I see that there is a new gerber format a couple of years ago called "Gerber X2". It does various things, like put metadata into the files saying what they are (copper 1, copper 2, etc) so you don't have to take pains to name the files with their purpose -- though it looks like you still need multiple files (what were they thinking?!) It can also integrate the drill information, rather than having a separate Excelon file.Anyway, who is accepting Gerber X2 files so far? It looks like Eurocircuits, Bay Area Circuits, Advanced Circuits all do. But the cheapie Chinese guys that I use, not so much.

author: rob.manderson
author_rank: Regular Contributor
timestamp: January 25, 2018, 07:20:44 pm
content: I found that Elecrow can accept X2 format but require a separate drill file.ALLPCB can't accept X2 format (as of about 6 weeks ago). Resent using non X2 gerbers and a separate drill file (DRL extension) and all was well.

author: Omgitskillah
author_rank: Newbie
timestamp: January 28, 2018, 04:36:41 am
content: I am pretty sure WellPCB accepts the X2 format. They have a Chinese branch as well and are very reasonably priced.

author: wbiliet
author_rank: Newbie
timestamp: January 29, 2018, 08:59:44 am
content: Ucamco, custodian of the Gerber format, offers a free Reference Gerber Viewer to the Gerber community.Supported file formats are Gerber (X1 and X2), Excellon (with tool header), DXF and IPC-256.The link ishttps://gerber.ucamco.com/On our Downloads page (https://www.ucamco.com/en/downloads) you can always find the latest version of the Gerber File Format SpecificationCompanies like Eurocircuits, Bay Area Circuits and Advanced Circuits use our UcamX and/or Integr8tor software and are familiar with Gerber X2.AllPCB and WellPCB are informed about our products and services but need more time to adapt to new standards.I am available should you have any questions regarding the Reference Gerber Viewer.For questions regarding the Gerber file format please use gerber@ucamco.comWerner BilietUcamco Marketing Communications Managerwerner.biliet@ucamco.com
Rigid Flex design in Circuit Studio - Page 1
Forum section: electronics / general

author: ntsiv
author_rank: Newbie
timestamp: January 17, 2018, 02:05:07 pm
content: Hi,I was wondering if there is any way to design Rigid Flex boards in Circuit Studio.According to Altium documentation the Layer Stack Manager needs to have an 'Advanced' option for creating multiple stacks and this option doesn't seem to be available in CS.