hybridfree/eevblog-posts huggingface dataset:
width track - Page 1
Forum section: electronics / general

author: alamwte
author_rank: Regular Contributor
timestamp: December 01, 2021, 06:32:02 am
content: Hello,I want to design a SFP 10gbit module.But I don't know what is the minimum width track for signal pins.Would you tell me its minimum track width?thanks

author: PlainName
author_rank: Super Contributor
timestamp: December 01, 2021, 10:22:05 pm
content: At a quick guess there are two lobes of a Venn diagram here:1. Minimum width is what your PCB manufacturer can support.2. Actual width will depend on how close your ground plane is and the impedance you need for the high speed.

author: alamwte
author_rank: Regular Contributor
timestamp: December 16, 2021, 06:06:28 am
content: Thank tou so much.
Samsung Cap. SPICE Model: Static vs Interactive Model? Precise vs Simple Model? - Page 1
Forum section: electronics / general

author: tinfever
author_rank: Regular Contributor
timestamp: December 15, 2021, 01:39:48 am
content: I'm trying to simulate a capacitor network in LTSpice to calculate it's impedance and estimate the output voltage ripple when the capacitors are used as an output filter of a buck regulator. When looking at the SPICE models provided by Samsung, I see they offer options for either a "Static Model" or an "Interactive Model". Under each of those options I can then pick either "Precise for RF" or "Simple for RF". Would someone be able to enlighten me on what these actually mean? My gut instinct is to pick the Interactive + Precise model because fancier surely equals better....right?Link to Samsung page listing the options:http://weblib.samsungsem.com/mlcc/mlcc-ec.do?partNumber=CL32B226KOJNNN
PCB UK - Page 1
Forum section: electronics / general

author: PerranOak
author_rank: Frequent Contributor
timestamp: September 10, 2021, 04:28:51 pm
content: Are there any PCB manufacturers in the UK that can offer a service to the "hobbyist" in the way that JLCPCB, etc. do?I mean a fairly low cost for say, ten simple two-sided boards.

author: bd139
author_rank: Super Contributor
timestamp: September 10, 2021, 04:58:39 pm
content: No.I tried to find one a couple of years back and min turnaround was over £200 for a single board.Just hit JLCPCB. If it’s for personal use you can make your own if your time isn’t too valuable.

author: nali
author_rank: Frequent Contributor
timestamp: September 10, 2021, 05:27:29 pm
content: It might help if you say what your idea of "fairly low cost" means to you and what board size you're talking about...As an example PCB Train (Newbury Electronics) online calculator shows for105pcs 50x160mm 2-sided at £170 for 5-day turnaround or £113 for 10-day. As a comparison I just ordered 5pcs of the same from JLPCB which cost me a grand total of £8.57 and took about 10 days to arrive.So, I'd forget it.Edit: corrected qty

author: voltsandjolts
author_rank: Unknown
timestamp: September 10, 2021, 06:33:50 pm
content: Yeh, your not gonna beat far east pricing, even including DHL DDP.This is probably one of the better value UK manufacturers.https://pcbpanel.co.uk/

author: AndyC_772
author_rank: Super Contributor
timestamp: September 10, 2021, 06:47:52 pm
content: I gave up trying to find a UK-based PCB manufacturer for small quantities and prototypes too.I'm all for the idea of paying "a bit more" to support UK manufacturing industry, but in this case it'snever"a bit". It's "add a zero and then some".Fact is, my business *is* UK manufacturing, and so are my customers. I just regard the bare PCB as a component just like any other, and no longer feel I "should" be using a UK PCB supplier any more than I feel I "should" be using UK-fabricated semiconductors.

author: PerranOak
author_rank: Frequent Contributor
timestamp: September 12, 2021, 09:03:04 am
content: Thanks all.My boards tend to be small, say 100mm square absolute tops. I'd pay 2, 3 maybe 4 times the JLCPCB cost to support a local business. This is not very impressive I know but every little helps.Oh well.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: November 24, 2021, 09:44:22 pm
content: You can compare prices of a bunch of different PCB manufacturers via:https://pcbshopper.com/

author: rpiloverbd
author_rank: Regular Contributor
timestamp: December 09, 2021, 12:47:19 pm
content: Have you contacted Ragworm?https://ragworm.eu/Looks like they works for hobbyists too.
Via in pad - PCB manufacturer - Page 1
Forum section: electronics / general

author: msantos
author_rank: Newbie
timestamp: October 27, 2021, 12:20:26 pm
content: Hello,Has anyone ever used a PCB with via in pad (capped via with copper)?I'm using a BGA with small pitched 0.5mm because of this component shortage, even tought it's a 2 layer board but is the only package available, otherwise I'll have to rewrite the firmware.The via in pad have holes of 0.15mm and a pad diameter of 0.3mm which not a lot of fab houses can do.Does anyone know of a good (preferably not too expensive) pcb house that can do this boards in Europe?I got a quotation from china around 200$ for 20 boards, I'm not expecting to find cheaper, but if I could find an EU manufacturer would ease things for me.

author: jc101
author_rank: Frequent Contributor
timestamp: October 27, 2021, 04:43:16 pm
content: Eurocircuits can do this, choose via filling and it's suitable for via in pad.https://www.eurocircuits.com
Controlled impedance for single and differential pair (45 ohm and 90 ohms) - Page 1
Forum section: electronics / general

author: triedgetech
author_rank: Newbie
timestamp: October 13, 2021, 09:34:22 am
content: So I have a 6 layer PCB:Used thisPCB manufacturer for values.As you can see, my USB data lines go on 3rd layer from top - "SignalH".Single strip ought to have 45Ohm, differential - 90 Ohms.In this websitefor impedance calculation:What values do I put in for "H" and small "h"?I'm guessing small "h" is the distance to closest ground plane, which is 0.2mm in my case? What about big "H"? is it distance from "SignalH" to "Bottom" layer?Also don't understand whythe same PCB manufacturer has "Symmetric Stripline", when they don't allow for manufacturing in such way.According to them, signal trace must lie between two ground layers - exactly in the middle, but that's not possible, because they have different thickness for "core" and "prepreg" pertheir stackups(see 6 layer, 1mm thickness).

author: PlainName
author_rank: Super Contributor
timestamp: October 19, 2021, 07:59:28 am
content: I am happy to guessQuoteThe core and prepreg is 0.02mm difference, which might be considered within manufacturing tolerances. Couldn't spot what the core dielectric constant is, though.But, in any case, they do say:Quoteso I would assume that if you need a stackup to suit your stripline requirements they are willing to discuss the cost with you.

author: Pseudobyte
author_rank: Frequent Contributor
timestamp: October 22, 2021, 02:27:32 pm
content: When calling out diff pairs I always reach out to the board house to ask for the trace/space/stackup for a given differential impedance. They use SI8000 that has their finely tuned process parameters baked in. It is usually better to ask and design to the nominal values the board house provides. After all, they are the ones that are going to build it and guarantee the tolerance on their COC. I only ever don't ask if I don't want to pay for controlled impedance at which time I break out the calculator. If you can get a pressed stackup from your vendor then that is great.
Tina-TI model of simple oscilloscope CRT - Page 1
Forum section: electronics / general

author: jpwolfe31
author_rank: Contributor
timestamp: October 12, 2021, 06:00:35 pm
content: I am trying to recreate a circuit in Tina-TI. It is the final x-amplifier for an oscilloscope. So far, the model works well, with the exception of the output waveform voltages. I suspect adding a model for the CRT horizontal plates would fix this. Right now the outputs to the CRT are just open in the model.Any info would be appreciated.Thanks

author: asmi
author_rank: Super Contributor
timestamp: October 15, 2021, 04:24:25 pm
content: One thing that annoys the crap of me is their stupid restriction of only 3 probes if you use any external (non-TI) models in your circuit

author: mstevens
author_rank: Regular Contributor
timestamp: October 20, 2021, 06:40:52 pm
content: Tina is a good product. Tina TI is a limited version of Tina as far as I know. You may be able to do all you need in the full version of Tina, fromwww.tina.com.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 21, 2021, 02:10:42 am
content: What would you model the CRT as?Typically it's just a few pF; if you're having DC bias issues it ain't gonna be this.Tim
What CAD software should i use, i am a CAD noob - Page 1
Forum section: electronics / general

author: robert555
author_rank: Newbie
timestamp: October 15, 2021, 07:03:22 am
content: Hello,I wounder what CAD software i should use, because I got a very niche job for now, but most similar jobs I can imagine is burglar/fire alarm, industrial electrician low voltage, electrical automation low voltage stuff.The job i am going to do include followingMostly low voltage stuff, see 24VDC, but also a little bit of 230VAC circuitsDifferents types of low voltage lamps/LED etcPressure sensorsDifferent types of USB unitsMany different types 4-20mA sensorsBut mainly its not alot of different componets types in our systems, and for the most part 101 circuits stuff, at least at a the "system designer level" where i am at.The hard part with this is there is always very very very many sensors in our systems, but also very very very many different parameter on each sensors (like cable marking, sensor name, alarm high/low limits, range, setpoints, units, hysteresis, SN numbers etc all this i call "component data").What i need is a CAD software that can do following thingsHave a very powerful/smart way of processing all the "component data"Can export the "component data" to csv or xls or smilar and present it like a cable list, with different pre setup parameters that is easly changeable "component data"Easy to use, the simpler the betterEasy to draw schematics or auto generated schematics in custom input sheet/page.Easy to handle a lot of diffrent connections/cablingNice if open source, not a mustI hope you all understand what i am after....

author: nctnico
author_rank: Super Contributor
timestamp: October 15, 2021, 09:06:20 pm
content: This maybe? One of my customers is using it for industrial wiring schematics.https://www.eplan-software.com/

author: Just_another_Dave
author_rank: Regular Contributor
timestamp: October 15, 2021, 09:31:30 pm
content: Some of your requirements remind me to BIM programs (exporting data to cave, generating schematics, etc), like Revit. However, they tend to be a bit complex to use, as they can be used for many other things.As you just need to make electrical diagrams, QElectroTech may fit your needs (not a BIM software, just an electrical eda package):https://qelectrotech.org/
PSPICE Error - Page 1
Forum section: electronics / general

author: Cujo
author_rank: Regular Contributor
timestamp: October 01, 2021, 07:30:17 am
content: I'm trying to do a transient analysis with respect to the BJT'S Collector-Emitter voltage marker.But I'm getting an "Node $N_0004 is floating" error with the C1 capacitor. Not sure why I'm getting this error and how to fix it?Here is the error details:* From [PSPICE NETLIST] section of pspiceev.ini:.lib "nom.lib".INC "Schematic2.net"**** INCLUDING Schematic2.net ***** Schematics Netlist *C_C2 0 $N_0001 10uQ_Q1 $N_0003 $N_0002 $N_0001 QbreaknC_C1 $N_0004 $N_0002 10uR_R1 $N_0002 $N_0005 80kR_RC $N_0003 $N_0005 4kR_RE 0 $N_0001 3.3KR_R2 0 $N_0002 40KI_Vi $N_0004 0+SIN 0V 10mV 1KHz 0 0 0V_VCC $N_0005 0 DC 12V**** RESUMING Schematic2.cir ****.INC "Schematic2.als"**** INCLUDING Schematic2.als ***** Schematics Aliases *.ALIASESC_C2 C2(1=0 2=$N_0001 )Q_Q1 Q1(c=$N_0003 b=$N_0002 e=$N_0001 )C_C1 C1(1=$N_0004 2=$N_0002 )R_R1 R1(1=$N_0002 2=$N_0005 )R_RC RC(1=$N_0003 2=$N_0005 )R_RE RE(1=0 2=$N_0001 )R_R2 R2(1=0 2=$N_0002 )I_Vi Vi(+=$N_0004 -=0 )V_VCC VCC(+=$N_0005 -=0 ).ENDALIASES**** RESUMING Schematic2.cir ****.probe.ENDERROR -- Node $N_0004 is floating

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 01, 2021, 11:03:43 am
content: Why is Vi drawn as a voltage source but modeled as a current source?A current source does not define a voltage, nor does a capacitor at DC. Also, a zero current is identical to an open circuit. So, the message is exactly as it says; the node is floating.The implication for simulation is, the solver cannot find a solution for that node; it can be literally anything. The technical term is "singular matrix", which most other SPICEs call it in the error message. The solution is to add a shunt (from node to GND) resistance or inductance to define that voltage. Setting RSHUNT to a modest value (say 1e9) may also do the job, but mind it tends to mask the problem and transient simulation can go slowly due to the resulting poorly conditioned (near-singular) matrix.Tim
LTSPice model of low distortion sine wave generator - Help needed - Page 1
Forum section: electronics / general

author: RichardM
author_rank: Frequent Contributor
timestamp: September 30, 2021, 11:13:00 am
content: HiI thought I would try and build the 1khz sine wave circuit published by Elektor in LTSPicehttps://www.elektormagazine.com/articles/reference-sine-wave-generatorand discussed herehttps://www.eevblog.com/forum/testgear/question-cheap-pure-sine-wave-genertor-1khz/50/Unfortunately I cannot seem to get any sensible output, certainly no sine wave. The circuit has a bulb (12V, 50ma) so perhaps thats what I am modelling incorrectly ? Theer is a bulb sub circuit floating around on the web I used.Any hep appreciatedRichard

author: Kleinstein
author_rank: Super Contributor
timestamp: September 30, 2021, 11:24:28 am
content: The light bulb part is not easy to simulate. The regulation with the light bulb as PTC is based on a thermal effect of self heating that is no includes in most models. For the practical implementation the type and size of the light bulb can make a difference.

author: RichardM
author_rank: Frequent Contributor
timestamp: September 30, 2021, 12:50:44 pm
content: Ok, thanks. I guess simulation is off the table and the breadboard is the way forward.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 30, 2021, 12:56:18 pm
content: One can still do a simulation for much of the circuit. One may just have to change the amplitude regulation, or find a PTC model that includes self heating.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 30, 2021, 04:51:12 pm
content: The exact model to simulate the incandescent light bulb is not so important, because in the given schematic the light bulb is used as a voltage controlled resistor with a big integration constant (~seconds).My guess is the exact I-V shape for the filament doesn't matter much, but just in case you are curious how it looks like, I measured two light bulbs some time ago:https://www.eevblog.com/forum/projects/resistance-of-incandescent-light-bulbs/msg3720658/#msg3720658No matter how good your light bulb model is, the distortion level differences between the simulated and the real circuit might vary widely in practice.
[ORCAD] Text command for setting routing grid size? - Page 1
Forum section: electronics / general

author: Pack34
author_rank: Frequent Contributor
timestamp: September 03, 2021, 01:55:51 pm
content: Is there a command to specify the routing grid parameters? I'd like to configure my CAD mouse to type that in to toggle being "fine" and "standard" routing grid.

author: LTimko
author_rank: Newbie
timestamp: September 29, 2021, 01:27:07 pm
content: You can assign any hotkey to any command. The easiest way is to edit \SPB_Data\pcbenv\env file and add a following lines:Code:alias ~1 'define grid ; FORM grid all_etch all_etch_x_grids 0.125 ; FORM grid all_etch all_etch_y_grids 0.125 ; FORM grid done'alias ~2 'define grid ; FORM grid all_etch all_etch_x_grids 0.25 ; FORM grid all_etch all_etch_y_grids 0.25 ; FORM grid done'There "Ctrl-1" will set etch grid to 0.125mm and "Ctrl-2" will set to 0.25mm.
quick PCB review of my prototype dev board - Page 1
Forum section: electronics / general

author: smarq8
author_rank: Newbie
timestamp: December 15, 2021, 06:41:26 pm
content: HelloI try to build my first 2 layers dev board for my current project. Its based on ESP32, FT2232H bridge (UART+JTAG/SPI), battery powered with some TFT display (not yet included). But before I move forward then I need quick review of my PCB layout. Attached project (eagle) is not yet ended, its missing some less important things like display or sensors.Especially Im wonder:1) when I need to cross some hi frequency data lines (2nd screen) then in theory I create some obstacle for return path, so should I add some vias to reduce path, put vias from scrossing line as close as possible to data lines, put via without trace and solder some wire, or leave as it is? I know in this case it might be overengineering but I'm just curious what is more properly solution.2) as I need to trace 'source' to decouple capacitor on bottom layer then its better to trace it under 'decoupled' line or keep it away from it? (3rd screen)3) any other tips to improve my pcb?

author: thm_w
author_rank: Super Contributor
timestamp: December 15, 2021, 10:49:18 pm
content: Your four vias on the side of the trace looks good, that would be the way to do it.QuoteI can't see this mattering much at all. You could add a ground via near pin 47 if you do not have one already.
PCB track layout - is a 3.3 Mhz voltage boosting capacitor hazardous to signals? - Page 1
Forum section: electronics / general

author: badrequest400
author_rank: Contributor
timestamp: September 22, 2021, 04:23:24 am
content: I'm a hobbyist designing my first PCB (two layer) and I'm wondering about interference between currents in tracks that I've placed somewhat haphazardly.In the attached image, C5 and C6 are used by a chip called SSD1306 to boost a 3.3 V supply into 7 V for an OLED. It occured to me that maybe the pulses of current might cause interference in the clock signal coming from the microcontroller since the tracks for chip select and the SPI clock are running underneath the capacitors. It looks easy enough to move them a little away from those capacitors but if that's needed, how far do they need to be? Am I worried about nothing?Page 8 of this datasheet seems to suggest the capacitors will have oscillations at 3.3 MHzhttps://cdn-shop.adafruit.com/datasheets/UG-2832HSWEG04.pdfThe SPI clockspeed would normally be 4 MHz but I'm hoping to reduce the MCU clockspeed to save power which will also reduce SPI clockspeed. I'm not yet sure how much I can reduce it without adversely affecting something but I don't know whether it's relevant to inteference. Thanks for your attention.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 22, 2021, 05:43:18 pm
content: No, those won't be logic output pins nor will they be running at 3.3MHz. That figure is for the logic (SPI bus) pins when toggling at that rate.There's nothing you can do about the coupled length in the flex cable itself, anyway. No need to be any fancier on the PCB.The best thing you can do is provide isolation between signals, by pouring ground around/under them. Hair-thin ground traces are a far bigger curse than where the charge pump traces are routed!Tim

author: badrequest400
author_rank: Contributor
timestamp: September 23, 2021, 01:27:02 pm
content: Okay, thanks, Tim. I've increased the thickness of the power/ground traces. I also moves the traces for the two capacitors closer together to get their emissions to cancel each other a bit.
IBIS Models  - Page 1
Forum section: electronics / general

author: AndrewHodgson
author_rank: Contributor
timestamp: August 03, 2021, 09:40:18 am
content: Hi,I want to know what the best way to create IBIS models is and whether this is a worthwhile exercise?I want to create an IBIS model for PCIe gen 3.0 and various other signal protocols but I don't know how to do this? Some components it's very easy to get an IBIS model for but others it's very difficult and I'm wondering if generic models exist that I can edit?I was sent a s-parameters model by TI as an alternative for one component but I can't convert this into a useful format.Thanks in advance

author: tggzzz
author_rank: Super Contributor
timestamp: August 03, 2021, 11:49:08 am
content: If you are after agenericmodel, then I would have thought you would be simply looking at a spice model.IBIS models tend to be used for i/o pin inductance/capacitance/resistance/clamping, and hence are slightly different for each pin on a device.In addition, "protocol" usually implies operation at a much higher level than individual transistions and bits.

author: AndrewHodgson
author_rank: Contributor
timestamp: August 03, 2021, 01:15:32 pm
content: Spice models would be useful, but I'm not sure where to locate those either?I was aware I was misusing the term protocol but I thought it would sufficientCheers

author: tggzzz
author_rank: Super Contributor
timestamp: August 03, 2021, 01:42:22 pm
content: I suspect you will have to decide what aspects you are/aren't interested in modelling, and create a suitable model from spice primitive models such as voltage sources, transmission lines, resistors etc.

author: Shadowfire
author_rank: Contributor
timestamp: September 15, 2021, 08:14:55 pm
content: Generally speaking, you (as a PCB designer) will not make IBIS models. IBIS models are supplied by the vendor of the IC you are simulating.
Trick for non-PSPICE users - Page 1
Forum section: electronics / general

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 12, 2021, 05:19:00 am
content: Discovered this little gem:https://sourceforge.net/projects/softtableimit/Supported syntax seems to be out of sync with what's in the blog post, but seems a neat little tool in any case. Useful for 3f5/XSPICE users, without the convergence hacks of PSPICE (and it seems, also useful for LTSpice users?).Tim
LTspice Inductor current not symetrical around zero - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: September 05, 2021, 07:42:12 pm
content: Hi,I am pulsing +5v/-5v across an inductor, both saturable, and fixed, but my current is not symetrical around zero.Do you know why not?

author: Ian.M
author_rank: Super Contributor
timestamp: September 05, 2021, 08:28:10 pm
content: The .tran startup option has no effect as you have no DC sources.Your source does not have a symmetrical waveform*- fix it!.tran uic forces all inductor currents to start from zero. Therefore if you don't want a startup transient you must start the waveform at a point in the cycle where the inductor current would be zero (after many cycles).Try:Code:PULSE(-5 5 25u 100n 100n {50u-100n} 100u)* See my comments here:https://www.eevblog.com/forum/projects/where-is-my-error-in-this-ltspice-simulation/
pads pcb viewer - Page 1
Forum section: electronics / general

author: Zlutz
author_rank: Newbie
timestamp: July 13, 2021, 12:08:02 pm
content: Hi, all!I have a 15 year old project from a different company that doesn't exist anymore. Files are .SCH and .PCB.I'm not even 100% sure it's PADS but it probably is.I'm almost 100% sure it's not Altium because I can't open the files with Altium...opened with notepad++, lines 4 to 16 in schematic file are as follows:Drawn By FieldChecked By FieldQC By FieldReleased By FieldDrawn Date FieldChecked Date FieldQC Date FieldRelease Date FieldCompany Name FieldTitle FieldCode FieldDrawing Number FieldRevision FieldAny suggestions on what else it could be or is it pads?Anyone has a (link to a) working pads viewer? Shouldn't a viewer be free software? Siemens took over and now I can't seem to find a working download...Siemens "trial version" is a virtual machine on their cloud so I gave up on that (and also my trial is already finished).

author: casualrex
author_rank: Newbie
timestamp: August 01, 2021, 04:17:45 pm
content: I have a copy, zipped, it's about 275MB, too big to upload here.If you still need/want it, we could arrange dropbox access or similar.let me know.

author: Zlutz
author_rank: Newbie
timestamp: August 09, 2021, 08:05:33 am
content: Quote from: casualrex on August 01, 2021, 04:17:45 pmThank you very much, I sent you a personal message so you don't have to publicly post the link.

author: jpanhalt
author_rank: Super Contributor
timestamp: August 09, 2021, 09:32:08 am
content: Those two extensions (.sch and .pcb) are also used by Eagle. If Pads doesn't work, post the smaller of the files and I will test it.EDIT: My mind slipped as I wrote that. The PCB extension in Eagle is BRD.

author: Zlutz
author_rank: Newbie
timestamp: August 10, 2021, 07:10:55 am
content: Thanks for the offer, I just installed PADS and it's working.Problem solved, I'm so happy right now!

author: casualrex
author_rank: Newbie
timestamp: August 10, 2021, 09:40:57 am
content: I'm glad to help. Happy viewing.BTW when I got & installed the PADS viewer (around 2016) Mentor offered it as "Free" to anyone.

author: vkristof
author_rank: Newbie
timestamp: September 01, 2021, 08:17:56 pm
content: I figured I'd piggyback on this topic, namely a no-cost .PCB file viewer.I'm not a PCB designer, but every few months I have to look at output from our out-of-house PCB designer.Do simple to use, free, tools still exist? I use OrCad for schematic design, if that's of any help.Thanks.

author: casualrex
author_rank: Newbie
timestamp: September 02, 2021, 12:53:44 pm
content: @vkristof, re: simple to use, free tools, Have you seen the topic: "PCB/EDA software list" in this forum??Many tools are listed there.https://www.eevblog.com/forum/eda/pcbeda-software-list/
[ORCAD] Unrouted Nets in status bar? - Page 1
Forum section: electronics / general

author: Pack34
author_rank: Frequent Contributor
timestamp: September 01, 2021, 02:46:12 pm
content: I just noticed that the DRC in ORCAD doesn't include unrouted nets. You need to go to Check>Design Status on the menu bar. Is there a way to get this metric to appear on the status bar on the bottom of the editor like the "stoplight" DRC icon?

author: nctnico
author_rank: Super Contributor
timestamp: September 02, 2021, 08:58:51 am
content: Quote from: Pack34 on September 01, 2021, 02:46:12 pmI don't think so but I don't really see the usefulness of that. If you click on the square before the 'unrouted connections' item in the DRC window, you get a list with clickable coordinates of the connections that are still open. This way you can travel to any unrouted segments quickly; no need to scan the entire board for unrouted nets manually.

author: AndyC_772
author_rank: Super Contributor
timestamp: September 02, 2021, 09:56:47 am
content: I've addded 'design status' as a button on my tool bar. Saves a click.
LTspice: IGBT model and symbol? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: September 01, 2021, 08:19:58 pm
content: Hi,Is there an LTspice model and symbol for this 650V IGBT, or any similar IGBT, its 30A rated.IKW30N65EL5https://www.infineon.com/dgdl/Infineon-IKW30N65EL5-DataSheet-v02_02-EN.pdf?fileId=5546d4624b0b249c014b11cd5d3c3acb
[SOLVED] [ORCAD PCB] Save all color views? - Page 1
Forum section: electronics / general

author: Pack34
author_rank: Frequent Contributor
timestamp: August 30, 2021, 01:09:15 pm
content: I'm trying to make it easier on myself when starting a new layout to be sure that everything is consistent. Currently I just have an excel spreadsheet to help me setup all my layer views. However, this can be a bit of a chore when setting up a new board, it only needs to be done once, but still. I've then switched to saving each view individually and then loading them in a new design.Is there a way to save all the views at once?

author: Pack34
author_rank: Frequent Contributor
timestamp: August 30, 2021, 06:38:16 pm
content: It looks like that's what the "Save color parameters" does.

author: nctnico
author_rank: Super Contributor
timestamp: August 30, 2021, 09:44:16 pm
content: You can also export board / color parameters (under export -> more) to a file and import them into a new design.
PADs standard questions - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: July 06, 2021, 04:30:06 pm
content: Hi,When creating a symbol and you want to "enclose" the rectangular silkscreen top layer closely around the component...then how do you move the silkscreen line without it disappearing and becoming an extremely thin white line whilst you move it?Also, what layer do you usually put the component courtyard on in PADs standard?(as you know, the component courtyard shows the maximum perimeter of the component so that you can avoid collisions.)

author: CalMachine
author_rank: Frequent Contributor
timestamp: August 30, 2021, 05:03:15 pm
content: One way is to press Alt+Enter to bring up the line properties. Then type in x1,x2 and y1,y2 coordinates of the line to get it exactly where you want it.
How do you make all layers invisible in one go in PADs standard? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: June 27, 2021, 03:07:06 pm
content: Hi,Supposing i want to make Top copper, Top silkscreen, top poaste, etc etc , all invisiable in one go, is this possible?Or do i have to click each colour square separately?

author: CalMachine
author_rank: Frequent Contributor
timestamp: August 30, 2021, 04:56:25 pm
content: Quote from: Faringdon on June 27, 2021, 03:07:06 pmYou can use the keycode "z" and then type in the layer number to show. For instance... if you want to only see top layer traces and top layer silk screen you would press "z 1 26" and press enter. Or if you want to see all layers you use "z *". On a 4 layer board, if you wanted to show only the top/bottom layers with top/bottom silkscreen, use "z 1 4 26 29". These numbers correspond to the numbers in the "Display Colors" window.
Schematic and Layout synchronized in PADs standard? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: July 07, 2021, 04:40:05 pm
content: Hi,I have been editing a PADs standard schematic and PCB.When I transfer to PCB by clicking the “PADs Layout” icon, it gives the usual “PADS layout link” dialog box offering a “Design” tab. So I click that and then select the button “ECO to PCB”. I click that button, and I then get the error message “Schematic Net List may have errors. Do you want to continue?”Do you believe that this means that Schematic and PCB are not synchronized (correspondent)?I am still able to connect components in the PCB and push them through to the layout, and surely it wouldn’t do this if Layout did not correspond to schematic?

author: CalMachine
author_rank: Frequent Contributor
timestamp: August 30, 2021, 05:01:49 pm
content: Are you using PADS Designer as your schematic tool or PADS Logic? I recommend Designer (Atleast that's what I'm familiar with).If you're using PADS designer, you might still need to generate the net list. To do that, on the menus go to "Tools" -> "PCB Interface". Select the "Create Netlist for Layout" Radio button and press "OK". If any errors pop up, address those and try it again.
Saturating transformer in LTspice? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: August 29, 2021, 03:59:46 pm
content: Hi,Is there any way i can make the transformer saturable here? (attached LTspice)......the triangle current in the 140mH coil should ski slope upwards from saturation, but i cant make it happen.Do you know how?

author: langwadt
author_rank: Super Contributor
timestamp: August 29, 2021, 04:07:23 pm
content: http://ltwiki.org/?title=Transformers#How_about_transformer_saturation_effects.3F_Can_LTspice_model_those.3F

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: August 29, 2021, 04:13:31 pm
content: Hi,To the OP, look at this thread:https://www.eevblog.com/forum/projects/arbitrary-(saturable)-coupled-inductors-in-ltspice/msg2807516/#msg2807516I contributed some modeling techniques for a non-linear core.Regards,Jay_Diddy_B
when a multilayer pcb design is required: - Page 1
Forum section: electronics / general

author: Dinos Tsakalakis
author_rank: Newbie
timestamp: August 24, 2021, 02:51:41 pm
content: Hallo , i know that this question sounds silli butt , i have to make a pcb design and i need to take a descision of how many mayers i must use ,and i also wonderring if there are any restrictions ,of adding a layer ,and if the pcb can't be done only with one layer;Thank you,

author: Bassman59
author_rank: Super Contributor
timestamp: August 24, 2021, 03:54:37 pm
content: Quote from: Dinos Tsakalakis on August 24, 2021, 02:51:41 pmWell, for starters there's no real benefit to doing a single-layer board except for the absolute cheapest and lowest-performance designs. Managing the wire jumpers needed to get signals around is a pain. A two-layer board doesn't add cost and makes your life easier.The only restrictions for adding layers are that you have to add them in pairs, and that adding layers adds cost.Any PCB layout program you'd care to use should manage multilayer boards without any problems.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: August 25, 2021, 05:13:03 am
content: If it's a hobby project, what ever you are comfortable withIf it's for a product, then suggest having a look at Keith Armstrong's material likethis. There is also this video from. Basically if you want to make life easier for yourself (EMC wise), then you need to use at least a 6-8 layer board for a relatively complex design

author: james_s
author_rank: Super Contributor
timestamp: August 25, 2021, 05:46:06 am
content: I generally consider a double sided board to be a single layer. Maybe this is not technically correct but when I hear multilayer PCB I think multiple layers of PCB sandwiched together with buried traces in the inner layers. These days all of the hobby level PCB suppliers charge the same for single and double sided.

author: geggi1
author_rank: Frequent Contributor
timestamp: August 25, 2021, 09:53:08 am
content: Depending on signal-levels and noise immunity you will normally be good with dual layer.Many of the reasonable priced EDA packages will only let you make singel or dual layer.Dual layer is more flexible than single layer.Single layer is simpel to do if you etch the board at home but gives no benefit when getting manufactured boards.Single layer demands more planning of components to prevent wire jumpers.Dual layer PCB is possible at home but its a lot of hassle.My recommendation is:Single layer only on simple home etched boards. (pre production prototypes)Dual layer everything else unless there is special requirements.

author: asmi
author_rank: Super Contributor
timestamp: August 27, 2021, 06:26:25 pm
content: Since 4 layer boards now are so cheap, almost all of my boards are 4 layers (and more). They make layout so much simpler, and they are great for signal integrity.
Can't find 'ltspice.ulp' - Page 1
Forum section: electronics / general

author: Dinos Tsakalakis
author_rank: Newbie
timestamp: August 24, 2021, 02:49:38 pm
content: Error Message:Can't find 'ltspice.ulp'I am trying to make an ICD-2 clone on Eagle application v9.6.2. When trying to run the simulation linked with LT Spice, the following error is displayed: Can't find ltspice.ulpThe icon is also not properly displayed either. It simply shows the filepath bin/LTspice.svg instead of the graphic.What is causing this error?
PCB Supplier Questions Guard Bands - Page 1
Forum section: electronics / general

author: cjurczak
author_rank: Contributor
timestamp: July 28, 2021, 12:16:43 pm
content: Where I work we have a fair number of older designs from before my time with guard bands, or other similar copper structures which appear to be hanging or going no where. As these designs are moved from one PCB supplier to another, or something similar they generate a back and forth between engineering and the CAM department for the supplier.Does anyone document these types of structures to try and prevent these questions from a PCB supplier? Wondering if this has come up for anyone else and how is it documented to convey the info to the supplier.Quick Note, not looking to get into the design decision for guard bands, just how to work with your supplier to prevent excess delays. Any thoughts would be appreciated.

author: jrs45
author_rank: Regular Contributor
timestamp: July 28, 2021, 01:51:32 pm
content: Usually you would just thank them for pointing out their concerns but "please make them as designed".Guard bands that aren't grounded though?

author: Uky
author_rank: Regular Contributor
timestamp: July 29, 2021, 07:19:41 am
content: Sometimes, the PCB fabricator requires an equal amount of copper in order to balance the etching process. The software I am using can provide what they call "thieving" which is automated creation of isolated copper "blobs", like diamonds, round pads, or similar evenly distributed over the board area.

author: Feynman
author_rank: Regular Contributor
timestamp: July 29, 2021, 10:40:08 am
content: It's the plating process rather than the etching process that requires evenly distributed amounts of copper.A floating copper structure doesn't guard anything, so I wonder what the purpose of these structures is.Apart from that any question a PCB manufacturer might have should be answered in a proper fabrication drawing ("Copper thieving not allowed in design area", "Copper thieving allowed here and there with these and those constraints", ...).

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: July 31, 2021, 03:56:05 pm
content: Quote from: Feynman on July 29, 2021, 10:40:08 amMe too. And in RF it is common (at least it was for me) to put notes in the fab drawing about areas that must remain unmolested with stamps and manufacturer logos (a plague)...
GNSS Antenna Trace Width on 2 LAYER - Page 1
Forum section: electronics / general

author: Bradlez
author_rank: Contributor
timestamp: July 09, 2021, 02:41:56 pm
content: I've recently been trying to figure out a realistic way to design my traces on my 2 layer PCB (to be made by OSHPark) that can handle GNSS antenna signals (like from GPS satellites). According to the datasheet of BGA725L6 (a GNSS amplifier), it expects an inductor and a capacitor in series of 0402 size between the antenna patch and itself (the GNSS amplifier IC), which implies the trace width for a 50 ohm characteristic impedance would be around 20mil. However I used the calculators online for characteristic impedance for my PCB and instead I got 118mil for a 50 ohm characteristic impedance. Now this would mean I need 1812 components to reduce signal reflecting back caused by the changing trace width from trace to the pads of the passive components (lol V does not equal IR), however this is drastically larger than what the datasheet implies. I wouldn't even be able to avoid the massive trace width jump from the trace to the actual pad of the GNSS amplifier. I have a feeling I'm supposed to use a multilayer board with thinner copper and a thinner dielectric thickness (between layers), but is it even remotely possible to handle GNSS signals well on 2 layer FR4?Additionally, the datasheet suggests the values of the capacitor and the inductor to be 1nF and 7.5nH, but that places the resonance frequency significantly outside of the 1.1 to 1.6 GHz range that GNSS (like GPS) signals uses. Luckily, the datasheet of the GNSS processing IC I'm using suggests those components to be 120pF and 5.6nH instead which has a resonance frequency right on the target, but both minimum impedances aren't the most optimised (14 ohms, but could be <10 ohms with a better cap inductor choice). Why does the datasheet say the inductor is necessary for impedance matching? Is it worth it going for a 3rd order filter to filter out white (gaussian?) noise better (as white noise is introduced for all frequencies unfiltered)?

author: Zlutz
author_rank: Newbie
timestamp: July 13, 2021, 12:27:40 pm
content: That's the hard one if you can't order a board that is 0.3mm thin (or even less). For a standard cheap 1.6mm board, you need like 2-3mm wide traces and then like 6mm of "nothing" on each side of the trace...I quasi-solved a similar problem by putting my IC next to the board edge and then connecting it pretty much directly to the SMA connector (for my purpose, there are were no components are in between so it was a bit easier). You might put 0402 elements on as thick trace as you can and make it as short as you can and hope for the best.Other solution that worked very good on a different project of mine was putting the U.FL connector directly next to the IC (like 0.5mm away) and then using a small U.FL to SMA cable to put the connector where I wanted - I needed the connector on a cable anyways so this was perfect!
[ORCAD] Tabs in Layout? - Page 1
Forum section: electronics / general

author: Pack34
author_rank: Frequent Contributor
timestamp: August 31, 2021, 06:58:20 pm
content: The schematic tool clearly allows tabs and multiple projects open, but the layout tool "looks" like it does but it doesn't seem to work the same way. Is that tabbed looking part of the interface specifically for a multi-board design or is there a way to open unrelated boards side-by-side? I ask because each windowed instance consumes a license.

author: nctnico
author_rank: Super Contributor
timestamp: August 31, 2021, 08:31:45 pm
content: AFAIK you can have only one design (PCB or symbol aka footprint) open at the same time. But there is a separate viewer tool as well you could use to just open a design. The viewer tool doesn't consume a license.On Windows look for:C:\Cadence\SPB_17.2\tools\bin\allegro_free_viewer.exe
LTspice not working....wont let install - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: July 25, 2021, 01:29:30 pm
content: Hi,I just tried to open LTspice, like 100's of times before...but now i just get a dialog box saying "preparing library...", and it just hangs for ages....and wont start.So i just downloaded LTspice again.....now trying to install it...but an "LTspice installer" dialog box comes up...and its going off the screen bottom, and wont let me move it up.....its asking me to "accept"...but theres obviosuly another button off the bottom of the screen that i cant see...because it wont do anything...how do i resolve this? I cant move this dialog box up....and i cant proceed with the install.

author: StillTrying
author_rank: Super Contributor
timestamp: July 25, 2021, 03:26:02 pm
content: I've solved off the screen problems a few times but can't remember how.Temporarily scaling or choosing a smaller screen font is probably the easiest, just put the screen sizes back next time it stops at a dialog box.

author: nali
author_rank: Frequent Contributor
timestamp: July 25, 2021, 03:27:54 pm
content: Pressing the Windows key and up/down/left/right arrows moves the current window or dialog.

author: Faringdon
author_rank: Super Contributor
timestamp: July 25, 2021, 03:50:03 pm
content: Thanks, i tried both but neither work. I cant seem to make the screen text smaller, i am at the smallest size now.

author: StillTrying
author_rank: Super Contributor
timestamp: July 25, 2021, 05:35:58 pm
content: Make the screen portrait, switch back to landscape after you've done that box?It seemed to work on this W10, I could stretch the bottom of the windows down, the mouse use was difficult."Control -" & "control +" maybe.

author: Faringdon
author_rank: Super Contributor
timestamp: July 26, 2021, 06:27:23 am
content: thanks,solved bygoing "hide taskbar in the end

author: StillTrying
author_rank: Super Contributor
timestamp: July 26, 2021, 11:08:50 am
content: I was going to suggest move the taskbar to the left side, but didn't think it would give you enough extra lines.I nearly always have it on the left on a widescreen to get the maximum height for the windows, I'd probably move the start button back down to the bottom left of the left taskbar if I could.
Favorite EDA package for repeated-subunit layout - Page 1
Forum section: electronics / general

author: ezalys
author_rank: Frequent Contributor
timestamp: July 20, 2021, 12:55:36 am
content: I design a lot of instrumentation for physics instrumentation where we have a lot of repeated subunits. I've used kicad's repeat layout plugin, as well as diptrace and altium. The repeat layout function doesn't really work super well, diptrace falls short in a few ways (most significant being hard coded absolute paths in files.) Altium is very nice and basically meets my needs but I'd like to explore a bit. Does anyone have any suggestion for an EDA package with an educational (I'm at a university) version available that handles layouts with repeated subunits very well, that they like overall? PADS and OrCad seem quite popular but I'm not sure about their educational discount status and I don't even know if those versions have this repeated subunit functionality.

author: CadenceAE
author_rank: Contributor
timestamp: July 25, 2021, 02:27:40 pm
content: yes to both. OrCAD/Allegro support circuit replicate and has free student versionhttps://www.ema-eda.com/products/cadence-orcad/orcad-academic-program?_bk=orcad%20academic%20program&_bt=388026863982&_bm=e&_bn=g&_bg=62658746852

author: Feynman
author_rank: Regular Contributor
timestamp: July 25, 2021, 03:15:01 pm
content: You might want to have a look at Pulsonix:I'm not 100% sure, but I think they offer discounts for students.
Simulation on Proteus of FM Demodulation with 4046 - Page 1
Forum section: electronics / general

author: adrienboub
author_rank: Newbie
timestamp: July 20, 2021, 10:17:27 am
content: Hello everyone,First of all sorry for my bad english.I want to simulate on Proteus FM demodulation with 4046.I know that the center frequency Fo depends on the value of R1 and C1.I try to do this application circuit and it doesn't work too:I try to change the value of Fo according to the following curves:I conclude that the problem on proteus is from that part that change everythings and i don't understand how to control it :"Frequency Range" and "Frequency offset" in "Advanced Propreties"I look at anywhere and i don't know why !!!I'm loosing my head ^^Thank you in advance!
[SOLVED] WANTED! Multibus PCB dimensions for extender card design - Page 1
Forum section: electronics / general

author: airlomba
author_rank: Contributor
timestamp: August 28, 2021, 02:05:30 pm
content: Hello all,I need to make a Multibus extender card to repair some Lexicon Reverb hardware and I have been searching the Internet for the PCB dimensions, without success. The standard (although deprecated) is still for sale, but since I want to make my design (using KiCAD) freely available to everyone, anything that costs more than 0 bucks is too expensive.Can anyone help me by pointing to some source of information or better yet, to share some documentation that shows the PCB dimensions with the connectors?Thank you all for your time and eventual help.Best regards,Emmanuel.

author: KrudyZ
author_rank: Frequent Contributor
timestamp: August 28, 2021, 07:05:40 pm
content: Didn't take long to findwww.nj7p.org/Manuals/PDFs/Intel/9800683D.pdfThird item when searching for "multibus connector dimensions"

author: airlomba
author_rank: Contributor
timestamp: August 30, 2021, 04:45:56 pm
content: Hello KrudyZ,Thank you for your reply.Quote from: KrudyZ on August 28, 2021, 07:05:40 pmIt all depends on the browser configuration and the search engine used. On my system, Google didn't returned my anything useful. Not even using your keywords that I also used. I normally use duckduckgo as a search engine but even this one doesn't return any good answer. My PC needs a cleanup!On my wife's computer, however, I found interesting results housed in an FTP server from Stuttgart university. There is a lot of useful files there:ftp://bitsavers.informatik.uni-stuttgart.de/pdf/intel/_busSpec/Anyway, thank you for your time.Best regards,

author: airlomba
author_rank: Contributor
timestamp: August 30, 2021, 04:48:11 pm
content: Hello all,Anyone needing a Multibus 1 card extender?