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[Others] Let me know HIDDEN CIRCUIT ideas?

I'm thinking of making a secret door / hidden room kinda thing ( or something like that). I'd like to collect some ideas first for further learning.So now I'd like some advice on what kind...
  • answered Aug 20,2020
    by Andrew
Ranking Name Answers
1 PCBWay Team 6
2 Engineer 1
3 Stephen Newport 1