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You forgot the firmware of the headphones!

• toomuchtodo 6y ago
  Corded headphones! :) at least until open firmware exists.
  • treve 6y ago
    Ever tried to connect a corded headphone into a microphone jack? It works quite well
    • wizzwizz4 6y ago
      Is there some kind of diode for AC signals?
      • formerly_proven 6y ago
        Yes, they're called amplifiers. Directional coupling circuits would apply in theory, but not in practice; they're good enough to do full-duplex audio over two wires, but not nearly good enough to deal with the sensitivity of analog inputs if you want to prevent a signal from being read.