Questions tagged [cad]
Computer Aided Design
123
questions
0
votes
1answer
30 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
19 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
21 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
20 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
45 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. ...
1
vote
0answers
27 views
Convert/Import old Multi-board Assembly
I am using Altium v20.2.4 and i have a Multi-board Assembly project from Altium v18.
I am trying to open this document (*.MbaDoc). As it is for an older Altium version i get the info to convert it for ...
0
votes
0answers
8 views
PrimeTime question: -include_all_with_leaf
Does anyone knows anything about -include_all_with_leaf switch of report_power command in the Synopsys Prime Time PX?
Someone ...
0
votes
2answers
79 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
56 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
18 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
49 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
870 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
42 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
1k 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
108 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
102 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
37 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
828 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
921 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
71 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
2k 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
742 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
205 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
105 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
155 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
61 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
430 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
118 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
147 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
94 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
185 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
643 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
158 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
3k 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
427 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
184 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
373 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
521 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
726 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
119 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
830 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
640 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
5k 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 ...
2
votes
1answer
589 views
Altium VersionControl_RevNumber special string
I have encountered a rather strange problem in Altium Designer 17.1. I am using the special strings VersionControl_RevNumber and VersionControl_ProjFolderRevNumber to keep track of our PCB Revisions ...
0
votes
1answer
81 views
how to go from eagle design to Part list
I am looking for a maintainable, shareable and scalable process to output a complete part list (as in "Part N°XXX from supplier YYY") From an Eagle project, when it seems to only be able to provides a ...
31
votes
6answers
8k views
How were schematics drawn before CAD?
I was looking at the schematic of an old HP power supply I bought. It can be found here, around page 60-61.
This schematic was drawn long before CAD was a tool used by engineers. Things were still ...
