Common PCB Design Mistakes Beginners Make (and How to Avoid Them)

Maker, DIY
1

Hello everyone,
When I first started designing PCBs, I made many mistakes that taught me valuable lessons. I’d like to share some of the most common ones in the hope that they help beginners avoid the same problems.

  1. Placing decoupling capacitors too far from the MCU
    Always place 100 nF decoupling capacitors as close as possible to each power pin.
  2. Using traces that are too narrow
    Choose trace widths based on the expected current instead of using the same width everywhere.
  3. Poor component placement
    A good PCB starts with good component placement. Routing becomes much easier when related components are grouped together.
  4. Forgetting ground return paths
    A solid ground plane improves signal integrity and reduces noise.
  5. Ignoring manufacturer design rules
    Always run the DRC and check your PCB against your manufacturer’s capabilities before ordering.
  6. No test points
    Adding test points can save a lot of debugging time.
  7. Not checking footprints carefully
    Always verify footprints against the component datasheet before manufacturing.
  8. Relying only on autorouters
    Autorouters can be useful, but manual routing often produces cleaner and more efficient layouts.
    Final Thoughts
    Everyone makes mistakes when learning PCB design. The important thing is to understand why they happened and improve with each new project.
    What PCB mistakes taught you the most? I’d love to hear your experiences.