Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [cad]

Computer Aided Design

Computer Aided Design - designing things using an application on a computer (as opposed to sketches on paper)

145 questions
243
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37 answers

Good tools for drawing schematics

I was going to add a bit of information to my post on a previous day using schematics and some instructions. What programs are being employed for this purpose? I mostly want to see what others are using and that I can easily use to give descriptive…
Kortuk
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Where is the Eagle component library for 0.1" breakaway headers?

I want to put some breakaway headers into my Eagle CAD file. By that, I mean these: Does Eagle come packaged with a library for these? If so, what is the part called, and which library is it in?
Eric
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7 answers

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 drawn by hand. I was wondering how drawing large…
Joren Vaes
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30
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4 answers

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: However, I noticed the symbol does not have power and…
ryantuck
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6 answers

Is there a common netlist format?

Is there a common netlist format that is portable between different schematic/pcb/EDA/CAD tools, and if so where is the format or reference so I can implement it? If not, does each package implement it differently, or are there a few standards that,…
Adam Davis
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1 answer

Designing Pick-and-Place-friendly CAD library parts

I'm working on a PCB design with surface mount components to be manufactured by a PCB assembly shop. I'm using CADSTAR, and I had to populate the library with some components, from scratch. I'm new to this, and I want to make sure I'm defining…
David
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1 answer

Why do I get warnings for all my voltage supply connections in Eagle CAD?

Take a look at the following list of ERC errors: Why is Eagle CAD showing Warnings for the voltage supply connections? For example: POWER pin U1 VIN connected to VBUS I know these pins are connected to the correct supply voltage, so do I just…
josef.van.niekerk
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6 answers

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 across AutoCAD Electrical and struggling to understand…
Kristopher Rahim Afful-Brown
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12
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3 answers

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 such as making a proper title block/frame in Eagle…
Shawn Le
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9
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2 answers

Rounded corners in Cadsoft Eagle

I am sending off a pcb for manufactering, but it would be nice to round off the corners for them to mill off. How can I make nice rounded corners? I have used the three point arc thing before but I dont really like that... In what layer should I…
Theodor
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2 answers

Why ratsnest is called so?

In my favorite CAD, Eagle, there is a function called "ratsnest", which removes all multisegment airwires and replaces them with one straight airwire. According to wiki of some other CAD, A multitude of airwires are called ratsnest. But why is this…
Catherine
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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 laid out on a custom symbol? Is it better to…
Pop24
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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 the components, I'm not particularly concerned with…
Paul Uszak
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How do I install a KiCad schematic or footprint library?

After I download a KiCad schematic library or footprint library -- such as the ones from http://kicadlib.org/ -- how do I use it in my schematic and layout? Should I install that KiCad library file somewhere in the KiCad program folders ( C:\Program…
davidcary
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10 answers

3d modelling software for case design

What software is generally used in industry to design cases for pcb boards?
stbtra
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