hybridfree/eevblog-posts huggingface dataset:
What program to get component art models? - Page 1
Forum section: electronics / general

author: nsled
author_rank: Contributor
timestamp: May 22, 2023, 01:54:10 am
content: Hello I'm looking for a program that has nice models of components, that can give better representation in schematics.Something likehttps://youtu.be/uVuAY4BiPkY?t=215but maybe better?

author: ataradov
author_rank: Super Contributor
timestamp: May 22, 2023, 02:20:46 am
content: The diagram in that video is directly from Autodesk Tinkercad. So, that's one option.https://www.tinkercad.com/circuits

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 23, 2023, 08:47:10 pm
content: That is not a "better representation".I see a black dot with an "N" on it, but I have no idea what it is, or what those three connections mean, and it is a pretty useless drawing. sure, if you already have the parts and know what they are, you can copy the circuit with such a drawing, but that still does not help in understanding what it does or how it works.Schematic drawings of electronic circuits have evolved over (probably more then) 100 years, and they put a lot of information into a standardized format, and this works very well. Learn the abstract symbols and how to use them. This will be mandatory anyway if you want to build anything but the simplest circuits.

author: nsled
author_rank: Contributor
timestamp: May 24, 2023, 02:00:22 am
content: Quote from: Doctorandus_P on May 23, 2023, 08:47:10 pmCorrection, its not a "better representation" for you. It is for anyone who hasn't followed electrical schematics before nor chooses to pursue learning them. Although still want an understanding of one specific instance.

author: RedLion
author_rank: Regular Contributor
timestamp: May 24, 2023, 02:22:17 pm
content: To be honest that looks like MS paint. ://www.tinkercad.com/circuits]https://www.tinkercad.com/circuitsTinkerCad, as mentioned by ataradov, is a good program for these types of realistic models.Fritzing is also very popular and open source, for bonus points.Quote from: Doctorandus_P on May 23, 2023, 08:47:10 pmThat's what I tell the sales managers, program directors and the rest of the cororate dead weight too, alas without result so far.
LTspice Triac .model doesnt work - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: May 18, 2023, 06:11:39 pm
content: Hi,Do you know why this triac model doesnt work in LTspice.I got it here.https://www.powerelectronicsnews.com/power-supply-design-note-simulating-a-triac/

author: Weston
author_rank: Regular Contributor
timestamp: May 18, 2023, 06:35:02 pm
content: Sometimes models you find online do not match the expected pin ordering on the symbol in LTSpice. I checked out of curiosity and the pin order for the netlist seems to match.What errors / issues are you having? Are you getting an error when you run the simulation? Or just not the expected behavior?Your triggering circuit looks at least a bit unconventional. Have you tried a simpler circuit?

author: Andy Watson
author_rank: Super Contributor
timestamp: May 18, 2023, 06:52:50 pm
content: Looks like you are trying to trigger the triac with a negative going pulse - which will be clamped by D1.

author: Faringdon
author_rank: Super Contributor
timestamp: May 18, 2023, 07:17:55 pm
content: Hi,Sorry my bad....i hadnt sized the RC trigger cct correctly ...
Routing multiple memory chips in daisy chain  - Page 1
Forum section: electronics / general

author: joniengr081
author_rank: Regular Contributor
timestamp: May 08, 2023, 08:09:53 am
content: Hi,The daisy chaining is the act of linking multiple points together in series.In a linear daisy chain, the first point is connected to a second point, a third point is connected to the second point, and so on until the circuit is returned to ground.In a ring topology, the points are daisy chained into a ring. Daisy chaining is popular because it saves space.I am wondering about routing multiple memory chips in daisy chain on PCB layouts. I guess it would be linear daisy chain, right ? For example if there are two DDR3 or DDR4 memory chips and we need to access one memory at a time from processor then we can route data lines from process to first memory chip and then to second memory chip. Is that an example of linear daisy chain ?

author: asmi
author_rank: Super Contributor
timestamp: May 08, 2023, 02:11:21 pm
content: Quote from: joniengr081 on May 08, 2023, 08:09:53 amThat's called "memory rank". Controller is using chip select line to choose which module it wants to talk to.

author: joniengr081
author_rank: Regular Contributor
timestamp: May 11, 2023, 09:02:34 am
content: Thanks for reply. I understand memory ranks.Then I am wondering about how do we route signals on a PCB layout in daisy chain topology. Kindly give me an example.

author: asmi
author_rank: Super Contributor
timestamp: May 16, 2023, 05:24:25 pm
content: For DDRx it's typically done as a "clamshell" design, when ICs belonging to different ranks are directly opposite - rank 0 is on the top side, rank 1 is on the bottom side, using the same vias. Memory controller need to support this feature (because DDRx IC balls are not mirror-symmetric), and many of them do, but not all. Take a look at any DDR3/4/5 dual rank DIMM/SO-DIMM, and you will see what it looks like in the real life. This way stubs are minimized (especially if via-in-a-pad tech used), so there is only a relatively minor signal degradation, though for some controller it can be enough to force lowering operating frequency.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 17, 2023, 08:44:42 am
content: The good old (30+years) memory chips were slow enough that routing did not matter much, but with DDR it's quite different. DDR needs careful routing and bus termination. Dee for example the 48 page pdf below, which is just about "Hardware and Layout Design Considerations for DDR Memory Interfaces".https://www.nxp.com/docs/en/application-note/AN2582.pdfNote:I did not read the document, just found it after a 30second search and skimmed briefly through it.
Saturn PCB asks for credentials? - Page 1
Forum section: electronics / general

author: electroBadger
author_rank: Newbie
timestamp: May 06, 2023, 07:23:19 am
content: Hi guys, maybe I'm just incompetent or maybe I missed something but as far as I can remember downloading the Saturn PCB Toolkit directly fromhttps://saturnpcb.com/was never an issue. However, just now I wanted to download the latest version (I've been working with 8.21 for some time now) and when I go to their website it wants me to log in. I don't recall it doing that before and their social media presence doesn't suggest anything of the sort. I though my ISP is funky so I tried VPN and proxy approaches but to no avail. I also can't find anything concrete on the web suggesting other people are experiencing the same so I was just curious: Do you guys know anything about it? Did something happen? Am I just stupid?I'm fine to continue to work with 8.21 for sure, it just kind of bugs me on a "why can't I get behind the reason for this" level.Also, sorry if there's other threads dealing with this topic already. I couldn't find any but I'd be happy with a link in that case.

author: jc101
author_rank: Frequent Contributor
timestamp: May 06, 2023, 08:37:29 am
content: Looks like a web server problem. That is the standard login box when protection is put onto a folder, in this case, the root and everything below it. Someone has dropped an .htaccess file into the root to password protect it.Guess they may have been hacked or are doing some maintenance, and this is how they have prevented access until they're done.

author: electroBadger
author_rank: Newbie
timestamp: May 06, 2023, 08:40:41 am
content: I see, that makes sense. Thank you, I'll try again in a few days and post results in case anyone's interested.

author: Daixiwen
author_rank: Frequent Contributor
timestamp: May 08, 2023, 07:14:59 am
content: I just tried and it seems to work now

author: electroBadger
author_rank: Newbie
timestamp: May 09, 2023, 06:44:20 am
content: Quote from: Daixiwen on May 08, 2023, 07:14:59 amYes, can confirm! Thanks guys, seems I was too impatient.
Filter Wiz Pro - Page 1
Forum section: electronics / general

author: cosmo little
author_rank: Contributor
timestamp: April 25, 2023, 12:00:23 pm
content: I bought this excellent filter design software 20 years ago. Unfortunately my copy has disappeared with changes in computers, etc. The latest version is available for download from several sites, however is locked and does not give component values for a design. The company that sold this software, Schematica.com, has disappeared completely. The web site no longer exists, and I have tried emails to the owner at two addresses. Both bounced.Does anyone have a working copy of this software? I think that there is a registration file that has to be pasted into the main program.This was by far the best active filter design software available at any price. It is a real pity that the owner did not make it available free if he no longer wanted to sell it.Cosmo Little

author: thm_w
author_rank: Super Contributor
timestamp: April 26, 2023, 01:46:08 am
content: Have you tried playing around with Ghidra/Relyze/binaryninja?

author: Messtechniker
author_rank: Frequent Contributor
timestamp: April 26, 2023, 06:37:38 am
content: Would Filter Wiz Lite which is free work for you?A bit later:Just played around with this. Great piece of software.Filter Wiz Lite does all I need.

author: voltsandjolts
author_rank: Unknown
timestamp: April 29, 2023, 12:58:43 pm
content: Filter Wiz Lite 1.27 runs great in Linux WINE, nice GUI for filter design.The license terms state that some capacitor values may be missing in the final design, need to register to fix it - but I haven't seen that in the few designs I tried. Of course you can't register anymore.Lite versionhttps://www.softpedia.com/get/Science-CAD/Filter-Wiz-Lite.shtmlPRO versionhttps://www.softpedia.com/get/Science-CAD/Filter-Wiz-PRO.shtmlLast version of their website on the Wayback machine:http://web.archive.org/web/20190124185031/https://www.schematica.com/
Specctra/Electra DSN/SES file format specification documents? - Page 1
Forum section: electronics / general

author: sleemanj
author_rank: Super Contributor
timestamp: December 20, 2013, 12:01:20 am
content: Does anybody have a link to the specifications of the Specctra/Electra file formats (dsn and ses) used to go between various pcb layout packages and external (auto)routers like freerouting.net, qrouter?The only link to a pdf my google-fu could find seems to be long dead.

author: sleemanj
author_rank: Super Contributor
timestamp: December 20, 2013, 03:56:58 am
content: I think I finally found it...http://sm-7.net/upload/PCB/Autorouters%20and%20autoplacers/Cadence_specctra/Design_Language_Reference.pdf

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 20, 2013, 03:57:46 pm
content: thank you!

author: nabil
author_rank: Newbie
timestamp: November 12, 2018, 05:48:03 pm
content: link is dead, anybody still have pdf please ?

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 12, 2018, 06:54:57 pm
content: Not sure this is the latest revision of the specs, but I have this:

author: nabil
author_rank: Newbie
timestamp: November 13, 2018, 08:59:14 pm
content: waw many thanks, thats exactly what I was searching for last 3 days.

author: julesh
author_rank: Newbie
timestamp: April 26, 2023, 12:44:20 pm
content: The files here don't seem to include a description of the SES file format, which by inspection is very similar to the DSN file that's described in the linked file, but does seem to be slightly different. Does anyone have a link to a specification for this?
Allegro: How to allow blind/burried vias on top of each other? - Page 1
Forum section: electronics / general

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: April 25, 2023, 07:25:53 am
content: I have a 6 layer HDI packaging stackup. I'm allowed to have a blind via from M1 to M3, skip the M3 to M4, and then a via from M4 to M6. I have no idea how to tell the DRC engine this. Any suggestions?

author: nctnico
author_rank: Super Contributor
timestamp: April 25, 2023, 02:39:55 pm
content: I haven't tested this but it is like having an overlapping pad on top & bottom layer. IOW: if the vias don't have shared layers, the DRC shouldn't complain.
Adding assembly rails with kikit - Page 1
Forum section: electronics / general

author: hwstar
author_rank: Newbie
timestamp: April 21, 2023, 06:10:07 pm
content: I want to add assembly rails to my Kicad board design using Kikit, but I see slots are added by Kikit which could pose a problem when the rails are broken off.A picture is attached to aid in making the problem clearer.The script I'm using is:#!/bin/bashkikit panelize \--layout 'grid; rows: 1; cols: 1' \--cuts 'vcuts; clearance: 1.5mm' \--framing 'railslr; width: 7mm' \--fiducials '4fid; voffset: 5mm; hoffset: 3.85mm; coppersize: 1mm; opening: 2mm' \--copperfill solid \esp32-dc-monitor-controller.kicad_pcb panel/panel-esp32-dc-monitor-controller.kicad_pcbUnless there is a slot requirement for manufacturability, it would seem to me that the slots will cause material to be left behind when the rails are broken off.Does anyone know if there is a way to remove these slots in kikit?
LT8391 charger - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 19, 2023, 10:44:35 am
content: Hi,We have to do a supercap charger. It just has to keep a 25F supercap charged up to 6V. We choose 20A charge current. The supercap will be getting discharged every 15 seconds or so.Vin = 37VThe attached LT8391 sim in LTspice does the job….its set for 150khz, but when the supercap is near zero vols, the LT8391 sim conveniently reduces the switching frequency so the on_time is more realistic. We wonder if the actual real LT8391 chip will do this?..because the datasheet doesn’t say it will.Also, the LT8391 is a 4 switch buckboost controller…however, since we only ever wish to use it in Buck mode, we will only fit the two sync Buck FETs…do you think this is OK…it certainly works in the sim…datasheet doesn’t say though.Also, concerning the LSP_LSN current sense resistor, it is in the (noisy) switching node of the Buck…..but since we are not using buckboost mode, is it now ok for us to move the LSP_LSN sense resistor to just downstream of the buck inductor, so that it is now no longer in the noisy switching node?...once again, this certainly works in the LTspice sim, btu will it work in the real hardware?LT8391https://www.analog.com/media/en/technical-documentation/data-sheets/lt8391.pdfAttachments
Pcb cad and repos.... - Page 1
Forum section: electronics / general

author: Gibson486
author_rank: Frequent Contributor
timestamp: March 28, 2023, 12:27:13 pm
content: So, currently, I use github and store all designs in one repo. Now that i have to use it in a team enviroment, I am getting some friction (ie lots of github errors). First mistake I fixed....I decoupled the parts library from this repo...putting libraries in that repo was kind of painful, so I just put it in a separate one. Now, I am second guessing putting all the designs in one repo. Maybe that would work better for just putting completed production files in one repo, but designs in one repo kind of gets to be a pain when multiple people need to use. Telling other engineers to not upload random saves is becoming a chore as I have to go through all the github errors and sit down with them and check on what they did. Anyone have any insight in to this? The last thing is that I could just migrate to Altium's repo...but what would happen if we suddenly decided to not pay for it?

author: thm_w
author_rank: Super Contributor
timestamp: March 28, 2023, 08:38:48 pm
content: Are people working on the same designs or different designs?Shouldn't there be no issue if they are saving to different projects?The only major issue you should have is libraries.https://www.eevblog.com/forum/altium/altium-more-than-one-designer-collaboration-workflow/https://cadlab.io/git-version-control-for/altiumhttps://www.eevblog.com/forum/altium/ad18-and-git/

author: Doctorandus_P
author_rank: Super Contributor
timestamp: April 18, 2023, 01:28:46 pm
content: In general, you put each design (or program) in it's own repository.Recently there was a question on the KiCad forum about a user wanting to have a look at some PCB made by someone else. So I made a clone of the git repository (dumped on github). It turned out to be a 1.3GB download and it contained some 30+ unrelated projects (I think both PCB's and software). For me it was maybe a 5 to 10 minute download, but for others such a download can be prohibitively difficult.Also, I strongly dislike projects with no or bad documentation. There are just far to many projects on the 'net to wade through. And a project just dumped in such a collection is a first indication that the original author just does not care at all about doing things "properly". Quite often this is also reflected in the rest of the project. From PCB's without GND plane or decoupling capacitors (and just thrown together by some auto router) to spagetti source code that also throws a gazillion compiler warnings.
Improving Impedance profile in PDN - Page 1
Forum section: electronics / general

author: joniengr081
author_rank: Regular Contributor
timestamp: August 03, 2023, 10:02:54 am
content: Hi, I am simulating impedance profile in Hyperlynx PI. I have attached a profile. The impedance requirement is 0.1 Ohm or below. Which decoupling capacitors I should add of which package in order to have the impedance profile blow 0.1 Ohm.

author: Feynman
author_rank: Regular Contributor
timestamp: August 04, 2023, 06:14:41 am
content: Well, isn't that a question that Hyperlynx PI is supposed to help you finding an answer for?And up to what frequency do you need 0,1 Ohm impedance? Chances are that you don't need an impedance below 0,1 Ohm up to 1 GHz, if you don't need your rise times to be significantly faster than roughly 1 ns (slow rise times down as much as practicable).As a first guess you can add capacitors that have their self-resonant frequency at about your anti-resonance peaks. Any further action will depend on up to what frequency you need the impedance to stay below 0,1 Ohm. But again, a tool like Hyperlynx PI should give you a good answer by playing around.

author: nctnico
author_rank: Super Contributor
timestamp: August 04, 2023, 01:12:23 pm
content: Keep in mind that value is equally important as package size. A higher capacitance in an equal package size will resonate at a lower frequency. So even with equal package sizes, it will help to have different values to get a low impedance over a wide frequency range.
PI Expert wont stay open - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 15, 2023, 02:32:10 pm
content: Hi,I just downloaded latest version of PI Expert from power.com and installed.But when i open it, it opens, then immediately closes.Do you know why?I use windows 10https://www.power.com/design-support/pi-expert
LTspice sim is not regulating - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: April 09, 2023, 12:27:18 am
content: Hi,Why is this LTspice sim not regulating...its an attempt to regulate the output current.Top FET getting turned on continuously.....a bootstrap driver cant do 100% duty , so why does it try to?

author: Andy Watson
author_rank: Super Contributor
timestamp: April 09, 2023, 01:24:33 am
content: If I've read your circuit correctly, you've created a positive feedback loop. U3 increases output with increasing current. U2 inverts this - so its output reduces as the current increases and it appears that you are feeding this "voltage" back to the switcher, U1 - which presummably (I've not read the data sheet) sees this as a lack of output voltage - so it increases its output - as far as it can.
LTspice .mout file format - Page 1
Forum section: electronics / general

author: gnuarm
author_rank: Super Contributor
timestamp: March 18, 2023, 09:27:47 am
content: In LTspice, a file of measurement commands can be run on the results of a simulation, without running the simulation again. The text output goes into a .mout file. For whatever reason, this is not truly a text file. It has a null character between each two printing characters.Most text editors ignore the nulls. I've verified they are there, by estimating the size of the file, and it matches the Windows file size if the nulls are counted.Does anyone know what this is about? Is there a way to get LTspice to output a normal text file???
LTSpice 17 fails to update under Wine - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 17, 2023, 11:29:03 pm
content: I've been testing LTSpice 17 with Wine, and it works great for the most part.The one thing that doesn't work though is updating the software from within the app.Updating components does work. But "Check for LTSpice updates" gives a 12157 (or -12157, not clear, there is a whitespace between the '-' and code) error code, every time.
Viewer for Orcad 4.10 schematic - Page 1
Forum section: electronics / general

author: jrmymllr
author_rank: Regular Contributor
timestamp: March 24, 2023, 01:02:33 pm
content: I have these schematic files that are apparently for Orcad 4.10, according to text in one of the SCH files. I actually know nothing about these files other than they were found on archive.org and might be for a ISA card I have.I installed the Cadence PCB viewer but am not having luck getting it to work with the Capture viewer. How can I view these? I'd even be happy if someone could convert to PDF, if you are already set up to open these!EDIT: found that OrCAD is available on archive org and got it installed and working....after lots of trial and error.
Altium Circuitmaker Dragging a component with its track - Page 1
Forum section: electronics / general

author: elefurtronik
author_rank: Regular Contributor
timestamp: March 11, 2023, 07:22:31 pm
content: I draw my PCB and now I would like to make fine tuning on the PCB. Therefore, I'd like to shift some components. However, there is no property under the System Preferences -> PCB Editor -> Interactive RoutingAltium has this option to shift the part with the track but I couldn't find it in Circuit maker. Please help me with it.
LTspice..."time step too small error" - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: March 06, 2023, 06:40:09 pm
content: Hi,Does anyone know why the attached sim wont work?It gives "time step too small error", but the U1, to which it refers , looks well connected.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: March 10, 2023, 03:27:22 am
content: Show us the model.Probably a convergence problem.
Guide On Creating A .lib or .mod SPICE Model For MOSFET - Page 1
Forum section: electronics / general

author: Natustell
author_rank: Newbie
timestamp: February 15, 2023, 01:02:47 am
content: I need a SPICE model for:https://www.digikey.com/en/products/detail/infineon-technologies/IRF9Z24NPBF/811747None of the models I can find are .lib or .mod, which seem to be the only types that KiCAD and recognize. I tried .spi, but I receive a "too many parameters error".At this point, I think I need to create them myself in the appropriate file type. I can't find a speck of info on how to do this for MOSFET nor anything on the syntax and required information for a .lib or .mod. I am happy to learn, but I need to start somewhere.Can anyone help?

author: georgfour
author_rank: Newbie
timestamp: February 21, 2023, 12:00:51 am
content: It is difficult without special expensive software like ICCAP, but there are some workaround, but you have to be experienced in programming and understanding MOSFET behaviour.
Student license problems - Convert Cadence Allegro to Altium request  - Page 1
Forum section: electronics / general

author: J_C_C
author_rank: Newbie
timestamp: March 10, 2023, 01:30:34 am
content: Hi Guys,I'm currently trying to debug a few TI eval boards, and the Design files they've provided are Cadence/Allegro/Orcad format.Being an Altium user, I downloaded the free trial and all was good for conversion between; my trial period ran out the other day and I've since received a few more CAD files for other boards through TI E2E support.Is anyone available to perform the conversion for me?Would greatly appreciate it!Google drive link, as max upload size for EEV Blog is too smol:https://drive.google.com/drive/folders/1ik-keG55_X-vW0NNcdkmu0EdMymsbcEy?usp=sharingKind regards.
anyone could provide the correct cad model of s8050 transistor? - Page 1
Forum section: electronics / general

author: erinic
author_rank: Newbie
timestamp: March 09, 2023, 09:10:41 am
content: Hi, i need the correct cad model of s8050 transistor, any help? BIG thanks!

author: exe
author_rank: Unknown
timestamp: March 09, 2023, 09:21:53 am
content: How about taking a model for a similar transistor with the same pinout? Like 2n3904. Just check the pin assignments in datasheets just in case.

author: wraper
author_rank: Unknown
timestamp: March 09, 2023, 09:25:14 am
content: It's SS8050. By cad model do you mean 3D model? It' just a regular TO-92 package.

author: exe
author_rank: Unknown
timestamp: April 14, 2023, 12:06:50 pm
content: Quote from: erinic on April 13, 2023, 09:18:55 amI think it's AI-generated (or assisted page). Not that it's wrong, but doesn't look like written by a human.
KiCad6 - Error: Input Power pin not driven by any output power pins - Page 1
Forum section: electronics / general

author: newtekuser
author_rank: Frequent Contributor
timestamp: February 26, 2023, 01:21:28 am
content: I know this subject was beaten to the death in multiple places, I've read about it on reddit, on eevblog, youtube, other lesser known sources... typically I solve this by just adding the POWER_FLAG to either the ground or +5V connection, but for some reason, this pin of the 16x2 LCD is giving me trouble.The schematic is simple, pin 15 goes to a 330ohm pull-up resistor. This is with a symbol downloaded from snapeda because Kicad only knows about obscure LCD screens for some reasons which don't match my HW.Could this be a problem with the symbol, or I'm doing something wrong? If so, what?I also tried connecting this pin directly to the only other PWR_FLAG I have in my circuit and I get the same error.

author: langwadt
author_rank: Super Contributor
timestamp: February 26, 2023, 01:37:47 am
content: I assume A and K is the Anode and Kathode of the backlight.So the symbol have be made with the assumption that A would connected to a supply and the current limiting from K to ground.You have K connected to ground and the current limiting from A to supplySo either change the symbol or move the 330R resistor to the K line and connect A to 5V

author: newtekuser
author_rank: Frequent Contributor
timestamp: February 26, 2023, 03:24:02 am
content: If I remove the 330ohm resistor from the anode I no longer get errors, but why? Why does KiCad not like that I'm trying to limit the current to the LCD?

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 26, 2023, 03:26:54 am
content: The LCD symbol has likely tagged the anode pin of the backlight as a "input power", explaining the warning/error.I do not recommend that - generally speaking diode pins should just be tagged "passive" IMO.But as a more general rule, the idea is that KiCad doesn't know that whatever net is after a resistor, even if said resistor has its other end connected to an "output power", is also an "output power". And it sort of makes sense, as ERC is a pretty basic rule check and is not meant to analyze your circuits and if they are designed properly.So here, to silence the error, you can either just set it as an exception in KiCad and not change anything - it will not come back. Or, you can modify the symbol to set the anode pin as passive. Or, you can attach a 'PWR_FLAG' to the net between the resistor and the anode, which is how it's usually done.

author: newtekuser
author_rank: Frequent Contributor
timestamp: February 26, 2023, 03:37:28 am
content: Madness, but it worked... added the power flag between the Anode pin and the resistor, no more errors. Ignoring it was my thought but I'm a bit OCD.Thanks all!

author: langwadt
author_rank: Super Contributor
timestamp: February 26, 2023, 04:35:59 am
content: Quote from: newtekuser on February 26, 2023, 03:24:02 ambecause the symbol was made to have the current limit resistor in the kathode and the anode connected to a supplywith the resistor the in anode the anode is not connected to a supply
Should I learn VHDL-AMS? - Page 1
Forum section: electronics / general

author: suspension
author_rank: Regular Contributor
timestamp: February 07, 2023, 05:54:49 pm
content: I have a book printed in 2003 called The system designers guide to VHDL-AMS which I never had time to read. Today I just browsed through the TOC and it looks pretty interesting. It uses VHDL-AMS to model a complete RC airplane as a case study. The whole system including communication, control, electronics, etc. is modeled using VHDL-AMS.I am wondering if I should put some effort into learning this language with a goal of maybe using it in my pro-hobby projects and possibly to see if I can write a simulator supporting it. (I am an experienced software architect/engineer). I am already familiar with Verilog for digital modeling and C++/Java for software. Also, it is nice to understand how VHDL-AMS compares to Modelica and Verilog-AMS.

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 07, 2023, 07:48:22 pm
content: It's interesting, but I have personally yet to see it used in any real, non-academic project. I also personally don't know of any easily available tool supporting it.Indeed, your best bet these days would be to use Modelica instead IMHO:https://modelica.org/Now if anyone has any specific experience with VHDL-AMS they can share, along with actual tools - ideally free or at least affordable - I'll be all ears!

author: jmarkwolf
author_rank: Regular Contributor
timestamp: February 18, 2023, 06:45:05 pm
content: When I got out of school 33 years ago, another engineer warned me I better learn VHDL or I'll be a dinosaur in short order.I never learned it. I've never missed it. Never met anyone else who uses it. Who needs another layer of abstraction?

author: dobsonr741
author_rank: Frequent Contributor
timestamp: February 18, 2023, 07:17:42 pm
content: The -AMS would give continuous time analog sim. If you fine with Verilog, and it’s not your work mandated tool I do not see a reason why would you do a niche VHDL-AMS and not to choose Spice if you want analog simulation. Most people on this forum can advice you on Spice, but I bet zero on AMS.

author: georgfour
author_rank: Newbie
timestamp: February 20, 2023, 11:43:54 pm
content: I have faced recently with this language. Maybe we work in the same company? I also have this book.Honestly, there is no reason to learn it. There is no free tool to compile it, and much more promising is Verilog AMS, it supported by all commercial tool and recently open source Verilog-A compiler appeared (Open VAF). Even Verilog AMS is rarely used, and I have never seen people used VHDL AMS. I have access to xpedition AMS, and I am not impress by it.Modelica has open source realization and a lot of examples, if you want to try system level multi disciplinary modeling.
Allegro PCB designer : Export PDF - Page 1
Forum section: electronics / general

author: Thomas83
author_rank: Contributor
timestamp: January 23, 2023, 12:56:50 pm
content: Hello,I am using allegro pcb, when I export a pdf file (cf. attached file pdf_publisher), the name of the file is written above (cf. attached file equipement_allegro).Have any parameters to deactivate this option (write filename to output document)?Thanks.

author: Uky
author_rank: Regular Contributor
timestamp: January 25, 2023, 09:44:44 pm
content: I have no answer to your question other than I suggestthat you register with Cadence in order to post this question on their user forum.There is no need for a valid support account.You should be able to use the forum regardless if you have it or not.

author: Thomas83
author_rank: Contributor
timestamp: February 01, 2023, 04:04:56 pm
content: Ok thanks.

author: temperance
author_rank: Super Contributor
timestamp: February 08, 2023, 06:41:10 pm
content: On just enable the "filter header footer" on the PDF export setup tab.But it seems your version doesn't have this option. In that case I would just set the ext size to 0.001mm so it becomes invisible.

author: Thomas83
author_rank: Contributor
timestamp: February 09, 2023, 07:53:45 am
content: Hi,I am using allegro 16.5I set Texe size for Header/Footer to 0.001mm but the text siez does not change.

author: Thomas83
author_rank: Contributor
timestamp: February 09, 2023, 07:56:56 am
content: Your solution works.Thanks

author: Thomas83
author_rank: Contributor
timestamp: February 15, 2023, 12:37:25 pm
content: HI everyone,When I export PDf files, Orcad 16.5 print "target" drawing origin in the pdf (see atached file).How can I do to export pdf without the target?Thanks
Saturn PCB Toolkit  - Page 1
Forum section: electronics / general

author: girishv
author_rank: Regular Contributor
timestamp: February 05, 2023, 02:30:23 am
content: I am trying to download the Saturn PCB toolkit. The link to toolkit is redirected tohttps://saturnpcb.com/It seems SaturnPCB has stopped distributing the toolkit. I am unable to find any info on their site.Any suggestions?

author: dmendesf
author_rank: Frequent Contributor
timestamp: February 05, 2023, 03:41:55 am
content: https://saturnpcb.com/saturn-pcb-toolkit/

author: girishv
author_rank: Regular Contributor
timestamp: February 05, 2023, 07:45:29 am
content: Quote from: dmendesf on February 05, 2023, 03:41:55 amThe above link is redirected tohttps://saturnpcb.com/

author: Hawaka
author_rank: Regular Contributor
timestamp: February 05, 2023, 07:57:31 am
content: The download button for the windows version on :https://saturnpcb.com/saturn-pcb-toolkit/works fine by me.

author: girishv
author_rank: Regular Contributor
timestamp: February 05, 2023, 09:00:59 am
content: Quote from: Hawaka on February 05, 2023, 07:57:31 amSome strange issue with my ISP. I was able to download using a proxy.Thank you very much.
Advanced CAD tools usage guide  - Page 1
Forum section: electronics / general

author: knight
author_rank: Regular Contributor
timestamp: February 04, 2023, 04:44:53 am
content: I'm really having trouble learning these CAD tools.Can anyone point me out to basic introductory usage guides/pdf for the following CAD tools?1. Synopsys Lint2. Synopsys verdi3. Synopsys primetime4. Synopsys PTPX5. Perforce (this isn't a CAD tool but still need help)
Can Fusion 360 personal license create gerber files?  - Page 1
Forum section: electronics / general

author: Technical Ted
author_rank: Contributor
timestamp: March 05, 2023, 03:08:48 pm
content: I've done some searching, but haven't found an answer. I'm very familiar with Fusion 360 for mechanical design, using the personal license version for my hobby machine shop and 3D printer, but have never even scratched the surface in the electronics workspaces.Before I spend the time to start learning it, can Fusion free version be used to draw PCB circuits, layout the PCB boards and create the gerber files needed to have a few boards made? Just for personal use BTW, not commercial.Thanks!Ted

author: thm_w
author_rank: Super Contributor
timestamp: March 06, 2023, 10:05:18 pm
content: I would not botherhttps://www.autodesk.ca/en/products/eagle/free-downloadQuote

author: markietas
author_rank: Newbie
timestamp: March 08, 2023, 04:26:28 am
content: Or use Kicad, which is completely free, not artificially limited in any way, and much easier to use.

author: beanflying
author_rank: Super Contributor
timestamp: March 08, 2023, 04:35:10 am
content: Quote from: Technical Ted on March 05, 2023, 03:08:48 pmIt can and while there is some similarities in places between Fusions more traditional workflow it is not consistent and frankly a kludge made to fit in a package rather than an elegant solution. What I did like was being able to bring the board and components back into Fusion then design an enclosure around it.I have a paid Fusion360 license but last time I looked at it against KiCad for a simple project (just as a trial for someone way out of practice) both were a similar level of disjointed interface and frankly a bit clunky to learn. I will go back and give it another look as last time was over a year ago but no time currently to do that.While you are obviously aware of the limits of the free personal use license this is one case where a free alternative might be better as there is little to be gained for you.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: March 10, 2023, 03:01:00 pm
content: Quote from: beanflying on March 08, 2023, 04:35:10 amI actually found KiCad quite intuitive and easy to learn. But that was 7+ years ago. It has a lot of added functionality now and with that comes more complexity. Back then I also evaluated eagle, but I found it a horrible piece of software to work with. More and more I'm getting the idea that the brains of people work in slightly different ways. Some are visual, others are more abstract thinkers, and that influences whether or not they find a particular program easy to work with. There is no real "absolute measurement stick" for this that everyone can agree on.Quote from: beanflying on March 08, 2023, 04:35:10 amKiCad does have step export. It also collaborates nicely with the StepUp workbench in FreeCAD, but that is a whole other bucket of worms on itself...Another reason for me to have a strong preference for KiCad is that it's Open Source and will always be open and free. I have no idea what autodesk does with their software in 5 or 10 years time.
PCB Edge Traces for QFP - Page 1
Forum section: electronics / general

author: Shalomie42
author_rank: Newbie
timestamp: January 25, 2023, 01:53:57 pm
content: Sorry if this is the wrong sub forum, please move the thread if it is. Also is this has been answered before, please kindly link me to the appropriate thread.I have not done PCB schematics / layout in a long time, so I have been out of the game for awhile. I do however work with electronics in a daily capacity. I have an interesting requirement for a prototype where we have an existing PCB that has a 176QFP CPU on it and we wish to replace this CPU with another one that is completely different plus a bunch of other prototype circuitry. This means pinouts between CPUs and the prototype circuitry do not match. We do not want to re spin the PCB, because it is very complex... we only want to use it to replace the existing CPU and prototype using a different one.The QFP176 is very large in PCB area - about 1 sq-in. What I was thinking about was making two "daughter" PCBs. One to act as an interposer that solders directly to the QFP176 footprint. This interposer board would have edge traces that solder to the QFP176 footprint and then have high density connectors in the middle to break out the 176 pin connections. The second PCB would have a mating connector on the bottom and would press fit into the interposer PCB. In this way, the QFP176 on the board and the interposer essentially just acts as an 176 pin I/O connector. The mating board can then be made to any size and with any circuitry that mates with the interposer.I have done some searches online and I have not found a ton of hits. However, I have found a company that makes a QFP board similar to my idea. They can be found here:https://www.aprilog.com/Corrector_SL.htmThe particular board is found here:https://www.aprilog.com/images/176QFS16-QFS20-SMT-SD.jpgSo.. here is my question. I am looking to make an interposer board with 'edge traces', not castellations. The edge traces that I am looking to make are shown in the linked JPG. Castellations are a well known thing to put on PCB edges, but they are using through holes at a pin pitch larger than what I need. I would like to make a board with edge traces at 0.5mm pin pitch so the board can mate with the QFP176 footprint.How are edge traces of small pitch (0.5mm) usually done in an EDA tool? Are there any resources or any special needs in order to make them?

author: thm_w
author_rank: Super Contributor
timestamp: January 25, 2023, 10:55:55 pm
content: They show boards with 0.5mm pitch castellations on that site:https://www.aprilog.com/images/144QFS16-QFS20-SMT-SD.jpgEither its with castellations, or, you use vias to go from top to bottom layer, then have a blind SMD pad on the bottom layer.This is common on some SMD modems:https://www.powersystemsdesign.com/images/articles/1643400686-Telit_WE310G4_group.pngI don't think there are "edge traces" anywhere here.
anyone tried flux.ai in earnest? - Page 1
Forum section: electronics / general

author: abeyer
author_rank: Frequent Contributor
timestamp: March 20, 2023, 05:26:13 am
content: Way back whenDave talked about them on a stream (and wasn't very optimistic)... but there wasn't really a product yet at the time.Now that you can sign up, including a pretty full-featured free tier for public/limited private projects, I'm wondering if anyone's actually tried to put it through the paces. I signed up recently and poked around a bit, but was curious if others had thoughts.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 21, 2023, 09:47:16 pm
content: Looks nice, even Disney is listed as a user.
jlcpcb ad - Page 1
Forum section: electronics / general

author: artag
author_rank: Super Contributor
timestamp: January 29, 2023, 11:40:52 pm
content: That flashing moving jlcpcb ad is driving me mad.It's really not endearing them to me. Next order goes to pcbway.

author: thm_w
author_rank: Super Contributor
timestamp: January 30, 2023, 09:38:46 pm
content: ublockhttps://www.eevblog.com/forum/chat/meta-how-are-the-jlcpcb-advertising-banners-on-this-forum-supposed-to-work/https://www.eevblog.com/forum/chat/what_s-the-go-with-the-_quality_-of-ads-on-the-eevblog-forum/https://www.eevblog.com/forum/chat/eevblog-forum-ad-(bottom-banner)-auto-playing-audio-video-in-ads/https://www.eevblog.com/forum/chat/your-opinion-on-(not)-blocking-ads-on-websites/
74HCT74D with feedback in NI multisim - Page 1
Forum section: electronics / general

author: Southill
author_rank: Newbie
timestamp: January 12, 2023, 12:20:08 pm
content: Hi, im working on a project that needs a flip flop, and the only SOP package avaliable at my school lab is the 74HCT74D. The truth table is not that great for my need, as the D pin needs to be changed between H and L to toggle on the CP pinIn multisim i tried to just connect the Qinverse output to the D pin, and this worked... IN MULTISIM. I have a creeping fear that this wont be the case in real life since states change at the same time.Does anyone have experience with this, either with the chip or feedback in multisim who can give me some tips ? I know feedback isnt that great to use with latches, but the output in the truth table says Qn+1so im not sureThere will be a button input to this, so it wont be any high frequency stuffAlso, sorry if this is posted in the wrong place, i am new to the forum

author: Fgrir
author_rank: Regular Contributor
timestamp: January 12, 2023, 04:18:43 pm
content: The feedback on the flip-flop is fine, that is a totally normal thing to do. What is questionable is the slow edges your input circuit will present to the clock input. The spec for that chip recommends less than 500ns rise/fall times and you have a 100us time constant filter. It might work as you have it but to be reliable I would put in a schmitt-trigger buffer to sharpen up the clock input.

author: themadhippy
author_rank: Super Contributor
timestamp: January 12, 2023, 04:27:22 pm
content: QuoteIndeed,its one of those classic configurations that must stretch back to almost the birth of logic

author: langwadt
author_rank: Super Contributor
timestamp: January 12, 2023, 04:32:34 pm
content: Quote from: Southill on January 12, 2023, 12:20:08 pmnothing happens instantly, Q changes (to what D was rightbeforethe clock edge) slightlyafterthe clock edge
LTspice simulation just grinds to a halt? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: January 02, 2023, 07:35:47 pm
content: Hi,Do you know why the attached LTspice sim just stops working at about 56ms?

author: Warhawk
author_rank: Frequent Contributor
timestamp: January 03, 2023, 08:33:40 am
content: You're getting cross conduction (check the switch nodes and the current that flows from the power supply).High-side drivers are goofy. I am not seeing right Vgs voltages.

author: Faringdon
author_rank: Super Contributor
timestamp: January 03, 2023, 06:16:54 pm
content: Thanks, the LTspice sim now works, as attached, but is extremely slow...any tips on speeding this particular sim up appreciated?

author: Warhawk
author_rank: Frequent Contributor
timestamp: January 04, 2023, 11:46:57 am
content: Quote from: Faringdon on January 03, 2023, 06:16:54 pmYou can try the Alternate solver in the LTspice settings. Your simulation takes time because you likely face convergence problems. This often happens when something is "wrong".In general, the SPICE simulation engine is not well suited for switch mode simulations. Tools like PLecs or Simplis do a way better job.LT spice is a great tool and I use it frequently but only for fundamental simulations. Garbage in=garbage out. For example, I replace gate drivers with logic gates and ideal diodes for the current limit, etc.edit: Grammar

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 05, 2023, 08:19:53 pm
content: Yeah switching power supplies are slow to simulate with Spice engines. One way of making it faster is to make sure you have slower transitions (but then that may not be the circuit you really want to simulate). Very short rise/fall times are what makes simulation slow.For their own switching regulator models, LTSpice uses internal mixed-signal models that are fully optimized and are thus not 100% simulated using pure Spice. Of course you don't have access to all of those optimizations when using only basic parts and full Spice simulation.
Question: Self-hosted EDA projects - Page 1
Forum section: electronics / general

author: Just_another_Dave
author_rank: Regular Contributor
timestamp: February 02, 2023, 02:34:42 pm
content: Some months ago I read about a project called MeowCAD (https://meowcad.com/), which is an open source self hosted eda. It seemed an interesting option for being able to design simple boards from a tablet on the go (obviously not for serious projects), but, after giving it a try, it seemed quite limited and it didn’t work particularly well with a touchscreen.However, after trying jupyterlite (https://jupyterlite.readthedocs.io/en/latest/), which is a version of Jupiter that runs entirely in the browser thanks to wasm, I thought that it would be amazing to be able to run an eda like kicad entirely in the browser or as a progressive web app. Unluckily, it doesn’t seem to be possible to compile gtk easily with emscripten.On the other hand, QT already provides support for being compiled into wasm, so it might be possible that some lesser known EDA could be converted into a pwaDo you know if there is any self-hosted or wasm based EDA project?

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 02, 2023, 08:18:32 pm
content: Meow, my cat can finally do some layouting.

author: Kean
author_rank: Unknown
timestamp: March 05, 2023, 07:45:35 am
content: As mentioned in another topichttps://www.allaboutcircuits.com/news/exclusiveflux-ascends-out-of-beta-with-its-collaborative-pcb-design-tool/

author: pcprogrammer
author_rank: Super Contributor
timestamp: March 05, 2023, 11:30:14 am
content: EasyEDAis a free hosted system to make your schematics and PCB's.For me it works good enough.You can also download a offline version, but I never used that.