Cadsoft EagleCad Tutorial Lesson 4

Lesson 4 in my EagleCAD tutorial series. In this lesson we will finnish our basic schematic and make a few housekeeping changes. We will cover some new tools, point out some new tips and prepare for some new features to be added on in Lesson 5.

• Category

  Education

[zero0ohm]

The power jack you chose is one like a 1/4" or an 1/8 phono. The part you have connected to the positive terminal is actually the ground on the jack, which is the outside of the jack. As you can see, the two terminals that you connected are labeled "+".  Those are used to complete the circuit from the from the battery or primary supply and disconnect this supply when an external one is provided.

[rpcelectronics]

This is a 2.1mm coaxial style power jack. I think I have covered this before, but whoever drew this part was a bit off. I know what you stated sounds right, but if you connect the symbol up the way you suggested, it WILL be backwards. The + sign should be over the top line, but instead it was placed where it looks like it's associated with the shield. I understand that this is a self-isolating jack. Usually used for switching a battery supply in and out of the circuit, depending..

[rpcelectronics]

...depending on whether an external power source is plugged in or not.

[whybjorn]

Jason, thanks for your great tutorial. How do you know what resistor in the list corresponds to real world resistors (1/8 watt, 1/4 watt, etc). Thanks for your help.

[rpcelectronics]

To be honest, I rarely use leaded resistors now, but when I do, I go with the most narrow footprint and use 1/8w primarily. Of course, there are times you might need to use a larger footprint for large sizes. One way to do that is place the part on the board, then print the layout 1:1 ratio and then lay the real part down on the printout to see if it will fit.

I regularly do this with new SMT parts that I create libraries for. I want to make sure the footprint is correct.

[Philip Zorian]

The following is a response from CADsoft tech support re: the use of the Line / Wire Tool to draw electrical connection in the schematic:

"In the Schematic editor its best if you use a .1 inch grid to place your components and to draw your NET's. To define connections in a schematic use the NET command".

[rpcelectronics]

I did'nt make a point to discuss this since we were not CREATING objects, but yes, this is true. In order for everything to align in the SCHEMATIC, all parts must be set to the 0.1" grid.

If I have the time, I am going to do a short series tutorial on creating custom parts.

[manshuk89]

an excellent tutorial... really helped me a lot... thanx for such concise instructions!

[Adam Newsome]

A good way to release the wire is press the escape key!

[Rowell Regis]

thank you very much for all the tutorials you shared to us... it's very detailed and easy to understand this software....

once again thank you.... Mery X'mas in advance.....

[poncho088]

thank you for the tutorials!!! you make things very easy to understand, i hope to see more and more!

[bratan007]

Amazing tutorials. I"m a total beginner, so extra explanation you do helps a lot, so far it's pretty clear to me! :) Thank you so much!

[zero0ohm]

@rpcelectronics

These phone jacks are used on almost every guitar amp ever made. You can do a search for Fender amplifier schematic and you will find the symbol. These are used to ground the input when not in use.

[zero0ohm]

I want to first say that I am enjoying your tutorials and I really appreciate the work.

I don't know if there is a rule on youtube about posting URLs but I am having trouble doing that. I you would just go to google and search for "circuit schematic symbols phone jack" and click on the first link. Look at the phone jacks. Also look at the coax jack symbol.

[electronicfanatic1]

were goona pop a ground in there... this is a perfect time to say as an electronic fanatic... thats what she said lol