- Don't mix plating materials on connector contacts, as this increases likelihood of corrosion. For instance, gold plated-to-gold plated is fine, tin-to-tin is fine. Gold-to-tin is bad.
- When designing PCBs, use a ground plane by default. This has many practical benefits, but also big benefits with regards to signal integrity. If you are going to design a high frequency systems, grounding strategy is a huge rabbit hole that you should read up on.
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