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Beginner PCB design for LED clock

Discussion in 'PCB Layout, Design and Manufacture' started by MikeDong, Aug 16, 2019.

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  1. MikeDong


    Aug 16, 2019
    Hi everyone,

    I'm designing an LED clock using an Arduino, 74HC595s for the control, and ULN2803s for grounding the LEDs.

    I've got everything working on a breadboard, designed on a schematic and a first version laid out on a pcb in Eagle. I've never designed a pcb before,Usually,PCBgogo helps me complete the design and production so I'm sure there's lots of little errors.

    The main question I have is related to decoupling capacitors and a ground plane. I was having trouble finding out online if the capacitors should have their own pathway to the 74HC595s, or if they could both simply be connected to the ground plane.

    I haven't put the ground plane in in this version, and any suggestions overall are much appreciated.

    Thanks for any help.

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Connect Vcc from teh power distribution system to one side of the decoupling capacitor, then from the capacitor to the IC to be buffered. Keep the distance between capacitor and IC pin as short as possible to minimize the inductance.
    Connect the other side of the capacitor into the GND plane. For easier soldering you may want to use a thermal pad for the connection of the capacitor into the GND plane.
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