4 ms·

Thanks for that, I was partially aware of that, just made me think of crystal radios and how magical they are.

• jacquesm 7mo ago
  They are magical! A radio powered by the transmitter, it's an incredible thing, really. The trick is that the diode is a very low forward drop one, typically Germanium, which has only 0.2V forward drop. But for more magic, you can also use a razor blade or a little bit of lead and then seek for naturally occurring diodes on the surface of the material. These can be even more sensitive than the Germanium ones.