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Use this tag for questions about the theory and structure of receivers.
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feasibility of wireless passive crystal earphones
I just learnt about such a thing as a crystal radio receiver and the following idea came to my mind. I have no background knowledge on electronics nor anything related. … battery-less earbuds can be made, picking AM waves from very short range nearby stations such as an antenna plugged in the audio-out of my pc or smartphone or laptop or all 3 of them at the same time, the receiver …