Questions tagged [cad]

Computer Aided Design

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363 views

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 ...
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2answers
1k views

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 ...
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2answers
1k views

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 ...
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2answers
282 views

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 ...
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1answer
163 views

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 ...
3
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1answer
1k views

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 ...
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2answers
212 views

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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1answer
220 views

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 ...
3
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3answers
3k views

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 ...
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1answer
123 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 ...
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3answers
4k views

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 ...
3
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1answer
6k views

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 ...
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2answers
5k views

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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1answer
767 views

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? ...
2
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1answer
2k views

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. ...
3
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1answer
2k views

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 ...
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2answers
2k views

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 ...
5
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4answers
4k views

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
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1answer
2k views

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 ...
0
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1answer
384 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 ...
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1answer
3k views

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 ...
7
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3answers
1k views

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 ...
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1answer
902 views

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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2answers
5k views

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 ...
3
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3answers
3k views

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 ...
1
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1answer
230 views

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 ...
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2answers
209 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 ...
2
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1answer
2k views

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 ...
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2answers
7k views

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
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2answers
1k views

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 ...
1
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1answer
3k views

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
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1answer
256 views

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?
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2answers
172 views

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.
1
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1answer
654 views

Eagle model for TO-220F-4L

Where can I find an Eagle model for the TO-220F-4L package? Or something similar? I'm trying to add a KA78RXXC-Series Voltage Regulator and I can't even find another component with the same pins.
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6answers
32k views

Why use AutoCAD Electrical?

I'm an electronic & electrical engineering student in first year of university. I have had to use a few core programs as part of my course for programming and simulation software. However I came ...
1
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1answer
1k views

How to explicitly connect hidden pins in eagle?

I am working on a project where I used a shift register 74HC595N which has hidden GND and VCC pins in Eagle. So I used the invoke property as shown in the pics, and connected the VCC and GND to the +...
1
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2answers
2k views

Eagle cad replace command using command line

I am using Eagle Cad and changed my libraries to another folder. I needed quicker access. Now I have to update my components in my schematic and wanted to use the replace command from the command line....
3
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1answer
669 views

Need some help learning to make my own parts in Eagle

I am extremely new to using Eagle (or creating circuits in general). I've been searching around online for tutorials on making your own parts in eagle. However, I still have a few questions and I was ...
5
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3answers
4k views

Creating printed circuit boards (PCBs) which aren't flat

I would like to create a printed circuit board (PCB) which is not flat and which is not shaped into a square, but don't know how to proceed. Can Cadsoft Eagle create such a board? If so, how? What ...
3
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1answer
11k views

How to create tag type of label in Cad Eagle? [duplicate]

I can't get my copy of cad eagle to create tag type of label for a wire or a net. Instead I get simple text type of label. GND label is what I am trying to get. I have tried turning xref on and off, ...
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1answer
360 views

Altium : Rule on connector

I use auto routing with Altium and I search a way to force routing a connector on Bottom layer (as I do PCB prototype myself, it easier to solder connector on Bottom side). To do this, I create a room ...
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1answer
222 views

CAD Eagle difference headers

I am trying to figure out difference between these two header types. One appears larger than the other with names differing by 'RA' at the end.
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3answers
712 views

Change layer to a raster image object in Eagle

I have a project in eagle cad with an image in bmp which I imported some months ago. I have it in the top layer and I want to move it to the bottom one, but I can't find the way to change its layer. ...
0
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1answer
2k views

Installing Microsemi/Actel Libero on Ubuntu [closed]

I am trying to install the latest version of the Libero SW tools set from Microsemi/Actel on my Ubuntu laptop. The web site of the company says that their SW only supports the RH linux and they don't ...
11
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3answers
37k views

Editing title block/frame in Eagle

As you may know, along with my previous posts in SE I've shown myself as getting familiar with Eagle. And hence, new things to learn are coming and some are not always transparent. A simple thing ...
3
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3answers
2k views

Interfacing with USB connector in simulation

I'm prototyping a board which has a USB connector, in Spice or any other circuit simulation technology. The production board will plug into the PC and there will be some software which talks to it ...
2
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1answer
985 views

EAGLE CAD: Push aside traces by DRC clearance

Does anyone know of a script or tool which makes it easier to 'push aside' traces when routing by the specified DRC spacing? For example, if I have 2 traces which should be parallel and are 6 mils ...
29
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4answers
43k views

Eagle - How to attach a pin not shown on schematic symbol?

In Eagle, I would like to include SN74HC595 shift registers in my project. I found a library online a few months ago (can't find source anymore) that has this part. The symbol looks like this: ...
6
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1answer
15k views

Importing Drawings ( DXF ) in Altium

I'm having trouble importing DXF / DWG into Altium. I followed the procedure outlined in the Altium wiki File-->Import (selected my dxf) and nothing shows up on my mechanical layer. I've tried ...
1
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3answers
3k views

Can someone help me complete this Verilog code for this sequential circuit?

I'm still pretty new to Verilog and all and could use some help completing/fixing my code for this problem. I have made the state diagram, state table/assignment, minimized the equation, and even have ...