Questions tagged [cad]

Computer Aided Design

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How to import wiring csv into cad?

I have a .csv file which contains the (complicated) points of the paths that I need my wires to trace. I would normally use EasyEda for making grbl files, but I don't think it is capable. Is there a ...
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Is there a way in Mentor Graphics (Siemens) Pads Designer VX2.2 / Pads PCB to route through unused pads without generating a DRC error?

I am using an eMMC memory in one of my designs. It is in a 153 ball package (which appears to be one of two industry standard packages for this type of memory). The pads for the BGA balls have 0....
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What does INH as an IC pin label mean?

While using a CAD model for a 74HC4051D multiplexer which I downloaded from SnapEDA I noticed that pin 6 is labelled INH rather than E bar (or Enable) as I anticipated from the datasheet. What does ...
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An alternative to CADe SIMU

CADe SIMU is a industrial circuit drawning and simulation software. I have troubles with the icons size and some bugs, so I am looking for an alternative to CADe SIMU. I found good softwares to draw ...
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Keeping shapes/ polygons from going over same net trace in Cadence OrCAD?

I have an interesting situation where I have a current sense line that needs to be differential to ground. I'm trying to add copper pours to the top and bottom layers, however I can't pour over these ...
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Hirose connector footprint comprehension

I am trying to understand how the datasheet of the DF40 series of connector from Hirose describe the footprint. There is a part of the footprint receptacle that is hatched and I don't understand ...
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Old EDA software for Mac called "EDS"

So we have some old schematics at work that were ostensibly made by an EDA software called "RUN" "EDS" probably sometime in the early 90s. Supposedly this software ran under the ...
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Is it possible to import CAD model files into LTspice?

There are very beneficial and comprehensive collections of CAD models provided by Mouser or other websites. Is it possible to use them in LTspice?
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How to export EAGLE 9.6.2 design to CADSTAR 2019.0

Does anyone know how to export board from EAGLE 9.6.2 to CADSTAR 2019.0, so that CADSTAR can be used for making a layout and further netlist? Any readily available ULP script might help. The schematic ...
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How do I support 3-D integrated circuit layout design, using OASIS or GDSII?

How do I support 3-D integrated circuit (IC) layout design, using Open Artwork System Interchange Standard (OASIS) or Graphic Data System II (GDSII)? If I add through-silicon vias and or copper-to-...
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Altium - imperfect polygon-via connection

Altium tries to approximate circles where it doesn't need to. I have a polygon pour with some vias inside, associated to the same net. The connection style is "direct connection" so the ...
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How to switch SMD part for through-hole part in EasyEDA?

I'm using EasyEDA for the first time. I have about zero experience with CAD. I drew this schematic And generated this PCB layout But I really wanted to use a through-hole DIP package for the ...
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Adding Holes to a custom EAGLE library

Currently, I am creating a custom EAGLE library for a relay that I couldn't find the CAD for. In the packag stage: I added the pads as seen in the picture and I'm having second thoughts about adding ...
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I have created a sub-circuit in Proteus but I can reuse it? How do I reuse it?

Basically I want to pack a large number of components to form a small device. I will use this device many times. So I created a subcircuit and designed my circuit in it. But whenever I make a copy of ...
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How to define new component origin in EagleCad board view

I have been trying to rotate a component in my eagle pcb board mode but the centre of rotation has been defined upon one of the pins of said part. (potentiometer) This is what I have done so far: I ...
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Eagle Cad Resize PCB

I am having trouble resizing the PCB after components have been placed. I know this is not the usual method, but I have been given a .brd file and .sch and the board dimensions were decided already. ...
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Where can I get a 3D CAD model of the lead frame of TO220-2L?

I am new to electronics packaging and searching for a 3D CAD model of TO220 with 2 leads. I have tried at numerous websites without any luck. If anyone has a 3D CAD model of this lead frame or can ...
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Altium Polygon Pour gap - minimum feature clearance rule?

Didn't find anyone covering this. On this image I'm showing a GND Polygon pour artifact that I cannot seem Altium to detect that gap is too narrow. Polygons are: Remove Islands less than 0.2 sq.mms ...
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How to Show Voltage Inputs Without a Net in EAGLE

when I am creating a schematic in EAGLE I would like the ability to show inputs from another area. I think this should be a possibility, as it is used widely. I have an example of an image below that ...
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Software identification of a DIY (guitarist) CAD application

I know there is a reasonably popular tag for component identification, however I have a question about software identification. Before I used KiCad (when started with electronics), I used for a while ...
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1 answer
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Match Two PCBs Layout and Dimension in EAGLE CAD

I want to create a PCB (name A) where I can put another PCB (name B) on top of it using Autodesk EAGLE. I need to match the PCB B's pads position while designing PCB A. Here's the picture of PCB B : ...
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What is the difference between Eplan/Elcad/Autodesk Electrical vs Altium/Eagle/KiCAD?

Recently I came across the programs Eplan, Elcad and Autodesk Electrical. As far as I can tell, they are used to draw schematics. Is it possible to do the same thing with a PCB design software like ...
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Help identifying electrical components

Sorry if this inquiry is it a little bit basic and boring, but I need some sort of help with this, and I am really not sure where to look online. I need help identifying several different electrical ...
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2 votes
1 answer
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How to round all corners on a PCB in Altiium

All my PCB's have round corners, so you can't hurt yourself, and so it is easier to fit it into a rack. Now with altium i always have drag the edges in the Board Shape Editor to make them round. I ...
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What does this symbol mean in PCB Layout?

I came across this USB TX lines in pcb layout. Yet to figure out what do those circles at the joints mean?
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Understanding how PCB CAD designs affect the final product [closed]

I'm looking to design my first printed circuit board and having trouble understanding PCB CAD systems conceptually. I've started on schematics with EasyEDA, KiCAD, and Fritzing without finishing, as ...
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When placing a new line it doesn't get assigned a net, how to fix it in Altium?

I had this working well before, but now, every time i'm placing a new line from a component, it never gets assigned the net. In the Net field it is always "No Net", which forces me to manually place ...
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KiCAD parametric component placement

I need to place components in a circle of a certain diameter, with a certain pitch, and angled evenly. Is possible to do it in KiCAD automatically?
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1 answer
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Eagle Library Missing Micro b Connector?

I'm not sure if this post belongs here or in another community but here we go. I'm working with Eagle cad (pcb) and i'm looking through the libraries and I couldn't find a single MICRO b usb connector....
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Representing Heatsinks on board layout

When using CAD software to draw board layouts, is there any convention on how to represent heatsinks attached to, say, some power transistors? I want to make sure they don't interfere with one another,...
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How to import PCB 3D model (step file) designed in MCAD software in Altium and place PCB footprints, and route it?

I have my PCB board from Mechanical Design software as a Step file. Now, I want to import it into Altium Designer and place PCB footprints, and do the routing etc. I am looking for some guidelines or ...
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LTSpice error with V() function, .......... when referencing net within a subckt (V(subCktName.NetName))

I've converted an IBIS model to a SPICE model using microCap, and am trying to simulate that subckt with LTSpice. Using LTspice, I get an error with the subckt in the library. "u1:g1: Unknown ...
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LTSpice error with the V() function in a subcircuit

I'm trying to do a simulation with a subcircuit, and I've narrowed down the issue to the V() function. The simulation fails with the message 'can't find definition of model "V" ' Here is the spice ...
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1 answer
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Altium Designer 16.1 Can't find Pin in Place Menu

I am new to Altium, so this is probably a stupid question. I want to place a pin in a schematic, as described here. But I cannot find pin in any of the menus. No pins anywhere... What am I doing ...
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Annotate block in Proteus

How can I annotate a block in Proteus 8 (automatically)? For example, let's suppose I design a multiplexer and I embed it in a block and I need to copy it several times. How can I make Proteus ...
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Why only shared resistances are taken into consideration while computing Elmore delay?

While we compute the delay , using Elmore delay model we take into consideration the shared resistance and capacitance. I would like to know why are we only concerned with shared resistance not the ...
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4 votes
2 answers
550 views

Why are project files in Altium modified every time they are opened? Is there a way to prevent this?

I use Altium Designer 18. When I open a project file (.PrjPCB), the asterisk ("*") appears next to the project name indicating that the project has been modified, but I haven't actually made any ...
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On adding components in Eagle schematic same are not reflected on Eagle board else link error pops-up?

While adding new components to Schematic same are not reflected on board. Forward/Backward annotations cannot be performed. How Re-link the schematic and board so that I can add new components? or Can ...
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Deducing the CAD program used to make a schematic

I've received a reference schematic from a company whose chips I'm interested in using. After studying it for a while and copying the schematic into the CAD program I'm most familiar with, I have ...
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EagleCad Warning errors

Is it normal for me to be getting these warnings when I changed the names of the wires?
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1 answer
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How to simulate a component hspice model in multisim

I'm trying to simulate TS5A22364 and they have hspice and ibis models, and CAD model .bxl in Multisim. Is it possible? I have tried to add the package model but I don't know how to add the .bxl model ...
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2 votes
4 answers
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Basic Eagle question about DIPs in schematics

I just started using Eagle this morning, and I've read/watched some tutorials, but with no luck on this question; please forgive my naivete. I want to insert an LM324 (quad op-amp) into a schematic. ...
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In EAGLE, why is the ground pour not connected to these SMD pads?

There are some SMD pads in my schematic that are connected to ground, but do not appear as connected on the board. Any help on how to solve this? This happens for all pads except 12, which is also ...
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Visual circuit simulation on a Mac

I am currently trying to design a circuit on a Mac (some might say therein lies my problem). My goal is simply to design a rudimentary implementation of the circuit which I can visualise working I ...
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Wiring Diagram Software for Open Source Projects

So, obviously, there are plenty of CAD software options out there for hobbyists and open source hardware folks to do PCB schematic capture and layout. However, I'm having a really hard time figuring ...
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Import step model into HFSS [closed]

I have a step file and I want to simulate it in HFSS but it seams that the structure it is not made with solids, but with attached sheets because when I import it in HFSS I cannot define materials and ...
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4 votes
3 answers
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Altium schematic editor colours

I've just started doing some work for a company doing some CAD work where they use Altium 16. (16.1.10 to be precise.) I've used umpteen CAD systems over the years, but done very little Altium. I ...
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1 vote
3 answers
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Eagle - placing pin number silkscreen

I'm fairly new to PCB designing, and it's my first board design. If I want to add pin number silkscreen on the board, do I have to do it all manually on the board design page? Can't I do it on ...
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1 answer
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Eagle CAD autorouter places tracks too close to vias

Eagle CAD autorouter places tracks too close to vias. I tried to change some parameters in the design rules but without a good result.
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Eagle PDF Out Print

How can I print a PDF with defining how many pages I want to print out. The option (Page: From/To) is disabled and it prints the blank page as second page (completely useless, my customer may think I ...
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