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Schematic question

Former Member

Dear All,

 

I am quite new to electronics, still learning a lot. I got a schematics, attachet to this post, which I wanted to enter into Cadsoft Eagle.

 

The only issue I have with this is that some of the part of the schematic I do not understand.

 

On the left side where the Capacitors are shown, there are I think references to the 8 IC present in the schematics.

 

Like IC1P .... IC8P

 

Can someone tell me what these are? I think it really reference to each of the IC, but what the P mean? and what the numbers mean, 10 for GND and 20 for VCC

 

How can I enter this in Cadsoft? I am not sure which package/device I need to use.

 

Any help is appreciated.

 

Thanks.

Gabor

Attachments:
image
  • 0

    Hi Gabor,

     

    Looking at the color scheme, this schematic was created in EAGLE, so maybe the author can directly provide the EAGLE files. The 'P' just means power I think.

    Basically, it is possible to split the physical part (the IC) into several symbols, and in this case, the power pins have been split into a separate symbol, for clarity/visual layout purposes.

    My version of EAGLE (old v5) does not have a 74HC574 symbol. If yours doesn't, then you will need to create it. You could choose to split into two symbols the same way as the author of the circuit did if you like, then your schematic will be visually laid out the same way.

  • 0 in reply to shabaz

    Hi shabaz,

     

    Thank you for the quick reply.

     

    Yes, I do have this symbol, and actually I have almost finished to enter the whole schematics howover I am stuck with the issue I have posted in this post.

     

    I am not saying that I do understand what you are saying since I don't but I will try to google to see if that would help me.

     

    Thanks anyway.

  • 0 in reply to Former Member

    Hi Gabor,

     

    I think you're saying you have the part, but cannot see how to create the two pins for power?

    If so, click on the 'invoke' icon (shown below), then click on the component on the schematic. A popup

    will appear to allow you to create the two pins for power.

     

    image

  • 0 in reply to shabaz

    Yes you are right.

     

    Actually when I do that, there is already two entry in the window.

     

    One called A and the other as P

     

    So I presume I do not need to do anything with since this is aklready there.

     

    I have attahed teh part which I am looking on how to create. It is displayed as a red line so I presume it is a components and not a NET.

     

    Then it having the name as IC1P (At least I believe that this is teh name of that component) connected to the top and bottom net.

     

    But if I look at the top one, it is lok like an invidual component named as 20/VCC and the other one is another invidual components named as 10/GND, but in this case what is teh IC1P ?

     

    Sorry for all these crazy questions.

    Attachments:
    image
  • 0 in reply to Former Member

    Ok, I have found image

     

    You were right.

     

    I just had to click on teh button you told me and select the P:)

     

    I having the same line now.

     

    Thanks again.

  • 0 in reply to Former Member

    Correct, the A is likely to be the main part, and P is the power pins. A should already be grayed out, meaning

    it is already placed on the schematic.

    You're right, because it is red, it is a component (i.e. the power pins, P when you used Invoke).

    It is one component, even though the two red lines are spaced apart. The 20 means pin 20, the VCC means

    'positive supply' in this context.

    IC1 is the part designation, and IC1P is some pseudo-designation for part of the component.