Questions tagged [cad]
Computer Aided Design
139
questions
0
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878
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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 ...
0
votes
0
answers
179
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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 ...
- 139
1
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0
answers
3k
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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 ...
- 46
0
votes
2
answers
5k
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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 ...
- 101
4
votes
3
answers
3k
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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 ...
- 1,374
1
vote
3
answers
661
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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 ...
- 63
0
votes
1
answer
224
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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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-5
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3
answers
745
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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...
- 15
8
votes
2
answers
770
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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 ...
- 680
0
votes
1
answer
128
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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-...
- 11
4
votes
1
answer
951
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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 ...
- 63
1
vote
2
answers
756
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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 ...
- 571
0
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0
answers
6k
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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
1
answer
882
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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 ...
- 1,035
0
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1
answer
87
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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 ...
- 1,678
35
votes
7
answers
9k
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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 ...
- 12.3k
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2
answers
372
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How to add identical pad names to a package
In a schematic you can you use the @ notation to specify multiple pins with identical names for example GND@2. This doesn't seem to work in a package/board. For example an arduino board PCB has ...
- 719
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vote
1
answer
437
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EAGLE tool to LTSpice
I want to use a CadSoft - EAGLE tool model in LTSpice. I can't seem to find a way to do it. I can open the file in LTSpice as a "code" file so I can easily make appropriate changes in it. The file ...
- 47
2
votes
2
answers
1k
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Solder mask resist on extra large through hole pads
I'm adding extra copper area for more thermal heat on through hole components pads. I now wonder if it's okey to have the solder resist overlapping the edge of this extra large copper area and what ...
- 571
2
votes
2
answers
1k
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Designators in Altium PCB Libraries
I've noticed that some Altium PCB Libraries contain a designator in a Text field using the .Designator parameter. I've duplicated this in my own libraries, however ...
0
votes
2
answers
358
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Signals between sheets in DipTrace
Given multiple sheets in DipTrace, I am looking to do something like this:
There are a few ways I've found by which I can do something functionally similar - if not identical, - but which are ...
- 205
0
votes
1
answer
166
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Correct way in drawing a diagram
I'm an hobbist, so the reason of the silly question.
So I'm drawing with Eagle ( express ) a schematic for a DC motor driver with raspberry. I'm planning to use 2 L293D to drive four motors + another ...
- 803
3
votes
1
answer
1k
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Eagle CAD pins with same function
I would like to design a tactile switch footprint, where there are clearly two pads and two pins on each side of the switch, but let Eagle CAD's router know that it can route to either pair of pins. I ...
- 519
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votes
2
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233
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Is it possible to generate an electronic schematic automatically, and are there any tools to do this? [duplicate]
I was wondering if it is possible to automatically generate a schematic from some higher-level description (CPU ==> RAM, etc) of a circuit? And whether there are tools that can do that?
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0
votes
1
answer
312
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Mosfet shared diffusion Spice extraction (Magic)
I'm working on a project and try to design a layout using cmos CAD tool Magic. In a part of the project, I connect the nmos transistors in the form of shared diffusion as follows(each square ...
- 349
4
votes
3
answers
4k
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Is there a functional difference between square, round and octagonal via pads?
The reason why these different shapes exist is probably historical, but I'm interested whether there's any reason today to not only use a single kind of via.
The ones with round pads are the most ...
- 671
-1
votes
1
answer
125
views
EAGLE - Error when saving Library
After I've installed EAGLE on new OS I've moved all EAGLE files from my backup to main EAGLE directory inside programs folder to recover all my lib/files. All works good but when I save changes on a ...
- 375
8
votes
3
answers
4k
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Why are DIY PCB components placed at right angles?
I'm learning PCB CAD. I want to know why components seem to be placed at right angles and orthogonal to the PCB (assuming that it's rectangular). Since the traces are secondary to the placement of ...
- 7,229
5
votes
1
answer
8k
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How to set polygon clearance around the edge of the board in Eagle?
I created a polygon that I intend to use as a heatsink. The problem is that there is a lot of clearance at the edge of the board, much more than around traces even, why is that? How can I set board ...
- 719
0
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2
answers
6k
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Drill Size Error in Eagle Cad [duplicate]
No matter what I do, I still have these errors. I don't know what to do to fix this. Please help!!
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2
votes
1
answer
961
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What type of FinFET is this? It is an example file of Sentaurus TCAD
As as I am totally new to TCAD software, I'm unable to parse the code.
My doubts are as follows:
1) Whether it is a SOI Finfet?
2) Why am I only able to see half structure at the last node?
...
- 121
2
votes
1
answer
3k
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How to hide/delete the symbol pin types (named as pas/sup) from the eagle schematics?
Hi there,
I was trying to do something and not sure what I did without knowingly those small green circles along with names has appeared on ever pin of all the components I had in the schematics.
...
- 369
3
votes
1
answer
2k
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Differing Hole Notations In Eagle CAD?
I was just creating some vias in Eagle and was playing with the drill diameter, and for some reason Eagle seems to put differing notations around the hole when the size changes, is there any reason ...
- 183
1
vote
2
answers
2k
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Eagle library multiple packages in one device?
So in an Eagle library, the device is created by joining schematic symbols with pcb packages. You can have more than one symbol in a package... (a quad opamp). Is there anyway to have multiple ...
- 4,699
5
votes
4
answers
4k
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High DPI (4K) And EAGLE CAD
Anyone know how to make UI text and objects display larger in EAGLE CAD. I just got a laptop with a 4K display and it looks beautiful but the text in some programs is microscopic
- 215
1
vote
1
answer
2k
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Eagle CAD Multiple individual parts in one device
Good day,
I am trying to place multiple parts in one device. My use case is a foot print for a XBee chip. The device has two identical 10 pin 2mm SMT headers (NPPN101BFLC-RC: digikey link). There is ...
- 11
0
votes
1
answer
428
views
Altera Quartus. Technology Map Viewer looks different from expected
Recently, I've installed Altera Quartus 15.1 and now follow the "getting started" instructions, you can read it here. At the step: to see the resulting circuit go to Tools →Netlist Viewers →Technology ...
2
votes
1
answer
3k
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Need help in Altium polygon copper pour selects and deselects using arcs, angles, full circles
This is a follow up question of my previous question. I've done this board using AutoCAD and exported to DXF.
After that I used Altium designer to import the DXF file in which the outline turned out ...
- 369
7
votes
3
answers
1k
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Angles and measurement - PCB design help
I have started doing PCB design from last month and very new to this. I have done tiny bits on eagle cad and Altium cad but still learning things everyday. Now I got a challenging board to do. Though ...
- 369
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votes
1
answer
1k
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Can't define a new symbol into IEC in autocad Electrical
I got this library (see Image), online, that contains objects for household electrical components, and I am trying to make each object as a symbol into my IEC library but I can not do it. I tried this ...
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5
votes
2
answers
6k
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Designing castellations/half holes using EAGLE
I wish to use some castellated pads or 'half holes' for board to board connections but I'm having a hard time finding a reference detailing how to specify these in my CAD package of choice (EAGLE).
My ...
- 173
3
votes
3
answers
3k
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Can EAGLE CAD make square-ended traces?
Is there a way in EAGLE CAD (Version 7) to create "sharp" traces?
Here an image for better explanation:
The trace can be made wider. But if I increase the width, it looks something like this:
Which ...
- 925
1
vote
1
answer
239
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EAGLE - put "symbol" and corresponding "packages" in the "schematics view"
So in EAGLE every library has "devices" which usualy have one "symbol" and more corresponding "packages" available for that "symbol". So EAGLE only shows a symbol part in the "schematics view" and ...
- 613
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votes
2
answers
247
views
How to edit the colors of a connector in Autocad Electrical?
how do I change the colors of a connector in Autocad electrical?
I want to change the connector outline and pin labels to black, but I can't find the layer or properties to do so. The reason I am ...
- 3
2
votes
1
answer
2k
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How do I add the board of a pre-existing controller to my project?
I have a DigiSpark board that has the schematics and board files released in their website. I am making a PCB where I need to have that part in my circuit.
Right now I have tried editing the ...
- 23
2
votes
2
answers
9k
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What does 'PLS' acronym mean on this CAD drawing?
I was making some EAGLE parts and was curious about the highlighted acronym shown in the image below:
What does it refer to?
Full Datasheet
- 309
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votes
2
answers
2k
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Problems adding a component in Eagle CAD
I'm trying to draw a circuit diagram using Eagle CAD (v 6.5...), but one of the parts that I want to use isn't coming up in the component library. I know the diagram for the component is available ...
- 21
1
vote
1
answer
3k
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Importing Drawings ( DXF,DWG ) in Altium [duplicate]
I'm having trouble importing DXF / DWG into Altium.
I followed File-->Import-->selected my dxf,dwg-->config-->Information show Done!!-->and nothing shows up on my mechanical layer.
I'm using Altium ...
1
vote
1
answer
324
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PCI 164-Pin Design on Altium
I would like to design a PCB having PCI 164-Pin on that shown at image. Is there any component I can add to schematic on Altium or should I just put some I/O ports on schematic?
- 35
0
votes
2
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178
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Rising DC Voltage
I only have 3.3 DC Voltage on the pin of PCB and I want to supply a chip 5V. What are the ways to manage this?
PS: The voltage on the pin is always 3.3 V and max current on it can be 50 mA.
- 35