Questions tagged [cad]

Computer Aided Design

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233
votes
37answers
98k views

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 ...
0
votes
2answers
355 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 ...
0
votes
1answer
18 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 ...
3
votes
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 ...
6
votes
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 ...
0
votes
0answers
18 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 ...
15
votes
1answer
4k views

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 ...
0
votes
0answers
18 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. ...
30
votes
6answers
7k 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 ...
1
vote
1answer
694 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 ...
1
vote
0answers
26 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
70 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
46 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
16 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 ...
2
votes
2answers
763 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 ...
4
votes
2answers
420 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
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
46 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 : ...
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 ...
1
vote
1answer
836 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....
8
votes
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
votes
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 ...
0
votes
1answer
36 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 ...
0
votes
3answers
719 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?
0
votes
1answer
132 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 ...
1
vote
1answer
68 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 ...
0
votes
1answer
186 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
100 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 ...
2
votes
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 ...
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 ...
0
votes
1answer
58 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 ...
6
votes
2answers
25k views

Where to find buttons eagle cad

Does any one know where to find buttons in EAGLE that look something like the one in this schematic? I'm making a schematic and all I can find are complex looking buttons. If those are not available, ...
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-...
1
vote
2answers
620 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
1answer
112 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
139 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
93 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 ...
0
votes
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 ...
0
votes
2answers
285 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 ...
2
votes
4answers
178 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
618 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
157 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 ...
29
votes
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: ...