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Tracking and layout help

Discussion in 'General Electronics Discussion' started by Rajinder, Nov 14, 2021.

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  1. Rajinder

    Rajinder

    537
    10
    Jan 30, 2016
    Hi all,
    I need some advice please on a layout of PCB.
    I have a power track which is for a 12V 3A supply line. I need to add a led + resistor to this line as an indicator.
    My question is, do I need to make the track width for the led + resistor the same as the width of the supply line? Or can I get away with a thinner track for the led + resistor (which will operate at 15mA).

    Thanks in advance
     
  2. 73's de Edd

    73's de Edd

    3,294
    1,393
    Aug 21, 2015
    Thinner
     
  3. bertus

    bertus Moderator

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    956
    Nov 8, 2019
  4. Rajinder

    Rajinder

    537
    10
    Jan 30, 2016
    Hi all,
    Thanks for the information. I have seen the online calculator, however do I need thinner or the same track width as the supply line? I am not sure, I would think it needs to be thinner?
    Any advice.
     
  5. bertus

    bertus Moderator

    2,437
    956
    Nov 8, 2019
    Hello,

    The trace will need to have a size to be able to carry the current.
    The trace for the indicator led can be much smaller that the main current track.
    The indicator led will likely be in the milli amp range as the main current will be in the amps range.

    Bertus
     
    Rajinder likes this.
  6. Rajinder

    Rajinder

    537
    10
    Jan 30, 2016
    Yes, the led current is 15mA, where as the main supply is 3A. Thank you for clearing that up for me.
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009

    Did you not read the first reply to your post ?
     
    Rajinder likes this.
  8. Rajinder

    Rajinder

    537
    10
    Jan 30, 2016
    Yes, thanks. I have the answer now.
     
    davenn likes this.
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