Questions tagged [cad]
Computer Aided Design
126
questions
2
votes
2answers
141 views
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 ...
0
votes
1answer
96 views
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?
0
votes
0answers
25 views
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 ...
0
votes
0answers
22 views
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-...
0
votes
1answer
52 views
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 ...
0
votes
1answer
121 views
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 ...
0
votes
1answer
20 views
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 ...
0
votes
0answers
76 views
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 ...
0
votes
0answers
25 views
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 ...
0
votes
1answer
55 views
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. ...
0
votes
2answers
130 views
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 ...
0
votes
0answers
98 views
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 ...
0
votes
2answers
26 views
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 ...
0
votes
1answer
37 views
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 ...
1
vote
1answer
73 views
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 :
...
2
votes
2answers
1k views
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 ...
0
votes
1answer
47 views
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 ...
1
vote
1answer
3k views
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 ...
0
votes
2answers
114 views
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?
0
votes
1answer
103 views
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 ...
0
votes
1answer
40 views
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 ...
1
vote
3answers
1k views
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?
1
vote
1answer
1k views
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....
1
vote
1answer
72 views
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,...
0
votes
2answers
3k views
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 ...
1
vote
1answer
924 views
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 ...
0
votes
1answer
260 views
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 ...
1
vote
1answer
140 views
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 ...
0
votes
1answer
233 views
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 ...
0
votes
1answer
79 views
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 ...
4
votes
2answers
496 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 ...
0
votes
1answer
134 views
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 ...
0
votes
2answers
69 views
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 ...
0
votes
2answers
172 views
EagleCad Warning errors
Is it normal for me to be getting these warnings when I changed the names of the wires?
0
votes
1answer
112 views
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 ...
2
votes
4answers
210 views
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. ...
0
votes
1answer
719 views
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 ...
0
votes
0answers
169 views
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 ...
1
vote
0answers
3k views
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 ...
0
votes
2answers
4k views
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 ...
4
votes
3answers
2k views
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 ...
1
vote
2answers
495 views
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 ...
0
votes
1answer
193 views
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.
0
votes
2answers
488 views
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 ...
-5
votes
3answers
627 views
How to make a 3D .STEP model for components? [closed]
Any ideas? I'm really trying to make my own 3D components, I'v read something about solidworks but i havn't seen any tutorial about this topic until now...
8
votes
2answers
745 views
Standard format for custom symbols in schematic drawings?
When drawing a circuit in a schematic editor, most of the time people are going to have to draw their own custom symbols, for example ICs.
What is the standard practice for the way in which pins are ...
0
votes
1answer
120 views
Eagle Cad: Library package appears different when placed on pcb
I placed a device and package on the schematic and board. However, the package appears different on the pcb, and generates DRC 'dimension' errors. The package is a 3-pin sip, Allegro Micro Hall-...
4
votes
1answer
881 views
Eagle via option 1-16 not shown
For this one eagle drawing, I am not seeing the via option for 1-16 layer. I can only put a via connecting layer 1-2 (see attached). If I try to change layer while routing from top to bottom, I get ...
1
vote
2answers
671 views
PTH drill diameter do the IPC take the pin distance in account?
I wonder if the IPC take the Pin distance tolerance in account for the drill diameter? (see p in pic). I can't find any guidelines for it anywhere.
Or is it just so that it's implicitly,common sense ...
0
votes
0answers
6k views
proteus dc voltmeter and ammeter results are not accurate / non existent!
I'm a beginner to Proteus and was just exploring simple circuits and trying out different things on the simulator. I built this simple circuit with a potentiometer and an led and measured current and ...
