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Placing 24 LEDs on a schematic

Former Member

I'm designing a schematic for a debug board for a Z80 computer that I'm building from component parts. The board will let me single-step through a Z80 instruction cycle, and display the contents of the address and data busses via 24 LEDs. The LEDs are attached to a 24-pin header, which I'll connect to the computer prototype with jumpers.

 

My issue is that each LED assembly has 2 resistors and a transistor along with it. There are 24 of these assemblies, and I'm having trouble fitting them all on my schematic: I'm using an 11" x 17" frame, but it's still not big enough. In printed schematics that I've seen, they usually just show one LED assembly connected to one pin header, then note that this is duplicated 24 times. Is there any way to do this in Eagle? Or is there another solution, other than just duplicating each LED assembly 24 times?

 

I tried to attach my schematic, but it said the content type wasn't allowed.

 

Thanks,

 

David

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  • On 24/04/2016 4:26 a.m., David Schwab wrote:

    I'm designing a schematic for a debug board for a Z80 computer that I'm

    building from component parts. The board will let me single-step through

    a Z80 instruction cycle, and display the contents of the address and

    data busses via 24 LEDs. The LEDs are attached to a 24-pin header, which

    I'll connect to the computer prototype with jumpers.

     

    My issue is that each LED assembly has 2 resistors and a transistor

    along with it. There are 24 of these assemblies, and I'm having trouble

    fitting them all on my schematic: I'm using an 11" x 17" frame, but it's

    still not big enough. In printed schematics that I've seen, they usually

    just show one LED assembly connected to one pin header, then note that

    this is duplicated 24 times. Is there any way to do this in Eagle? Or is

    there another solution, other than just duplicating each LED assembly 24

    times?

     

    I tried to attach my schematic, but it said the content type wasn't

    allowed.

     

    Thanks,

     

    David

     

    --

    To view any images and attachments in this post, visit:

    https://www.element14.com/community/message/195349

     

     

    Hi David

    The .sch file extension is considered risky so for small files simply

    change the file extension to .txt and say you have done that.

    Also your file will likely be be to large for the Cadsoft Forum. It

    needs to be under 40-50kB to get in.

     

    You should zip it up.

     

    Attached is a zipped up sch showing that an option is to use modules, if

    your verion of Eagle has it available and you can use at least 2 sheets.

     

    Unfortunately for you the file will likely not reach Element14 If not

    pick it up at http://www.eaglecentral.ca

     

    HTH

    Warren

     

    Attachments:
    moduleLEDS.zip
  • in reply to autodeskguest

    Warren,

     

    Thanks for the schematic: that looks like exactly what I need. I've got 7.4 Lite, and it opened without issue.

     

    Thanks again!

     

    David

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